A magnetically controlled slip mechanism for optimizing heat dissipation

Abstract

The utility model relates to a magnetically controlled slip mechanism for optimizing heat dissipation, comprising an axially arranged active ring and a passive ring, wherein the passive ring is assembled on the main shaft of the equipment through a bearing, the active ring is sleeved on the main shaft and fixedly connected thereto, the inner edge of the active ring has an axial protrusion, the protrusion extends in the direction of the passive ring, the inner edge of the protrusion is in close contact with the main shaft, an air gap exists between the active ring and the passive ring, and the air gap is connected to the outside. The magnetically controlled slip mechanism for optimizing heat dissipation adopts a flange-shaped magnet bracket, which expands the contact area between the magnet bracket and the main shaft, and improves the heat conduction efficiency of the slip mechanism; at the same time, based on the air gap between the active ring and the passive ring, when the active ring and the passive ring rotate, the heat will be quickly transferred to the outside along with the flowing air through thermal convection, further improving the overall heat dissipation efficiency of the slip mechanism.

Description

Technical Field

[0001] The utility model relates to a slip mechanism, in particular to a magnetically controlled slip mechanism for optimizing heat dissipation. Background Art

[0002] The magnetically controlled slip mechanism is a mechanism that uses the electromagnetic induction phenomenon to achieve slip control. Since the Foucault current generated by the conductor ring in the magnetic field will generate heat, and overheating will cause the magnet to demagnetize, the heat dissipation problem is an important technical problem that the magnetically controlled slip mechanism needs to solve.

[0003] In previous solutions, the basic heat dissipation method is to dissipate heat through the spindle. However, there is an air gap between the conductor ring and the spindle, but the whole is almost sealed to the outside. Therefore, an electrically insulating non-magnetic thermal paste is used to fill the air gap and transfer the heat to the spindle as much as possible by heat conduction to optimize the heat dissipation and prevent the magnet from reaching the Curie temperature.

[0004] However, this method has certain defects. After the thermal paste fills the air gap between the main shaft and the conductor ring, we found during operation that the thermal paste may enter the air gap between the conductor ring and the magnet, generating viscous resistance to the relative movement between the two rings. At the same time, it makes it easier for the heat of the conductor ring to be transferred to the magnet, and there will be a problem of heat accumulation, resulting in a reduction in the magnetic field effect. Utility Model Content

[0005] In view of the above situation, it is necessary to provide a magnetically controlled slip mechanism with optimized heat dissipation that solves at least one of the above problems.

[0006] A magnetically controlled slip mechanism for optimizing heat dissipation, comprising an axially arranged active ring and a passive ring, wherein the passive ring is assembled on a main shaft of an equipment through a bearing, the active ring is sleeved on the main shaft and fixedly connected thereto, the inner edge of the active ring has an axial protrusion, the protrusion extends toward the passive ring, and the inner edge of the protrusion is in close contact with the main shaft;

[0007] An air gap exists between the active ring and the passive ring, and the air gap is communicated with the outside.

[0008] As a further solution of the utility model: the active ring includes a flange-shaped bracket and a magnet mounted on the bracket;

[0009] The magnet is arranged on the flange of the bracket and is located on a side facing the passive ring;

[0010] There is an air gap between the magnet and the passive ring.

[0011] As a further solution of the utility model: there are a plurality of magnets, and the number is a positive integer multiple of three or four, and the magnets are arranged in a circular array on the bracket.

[0012] As a further solution of the utility model: the magnetic pole directions of the magnets are arranged according to the Halbach principle.

[0013] As a further solution of the utility model: one end of the protrusion close to the passive ring abuts against the inner ring of the bearing of the passive ring, and the magnet and the conductor ring of the passive ring are located on the periphery of the outer circumferential surface of the protrusion.

[0014] As a further solution of the utility model: the thickness of the portion of the protrusion corresponding to the conductor ring is smaller than the thickness of the portion corresponding to the magnet ring.

[0015] As a further solution of the utility model: the passive ring includes an outer rotating ring and a conductor ring, the conductor ring is arranged on one end of the outer rotating ring close to the active ring, and the conductor ring is fixedly connected to the outer rotating ring.

[0016] As a further solution of the utility model: two steps in opposite directions are arranged on the contact surface of the conductor ring and the outer rotating ring, and the conductor ring and the outer rotating ring are fastened and assembled with each other through the two steps; there is an air gap between the conductor ring and the outer rotating ring.

[0017] As a further solution of the utility model: the air gap between the conductor ring and the outer rotating ring and the passive ring includes a first air gap, a second air gap and a third air gap;

[0018] The first air gap, the second air gap and the third air gap are connected in sequence, and the first air gap is connected to the outside;

[0019] The first air gap is an air gap between the conductor ring and the magnet, the second air gap is an air gap between the conductor ring and the protrusion, and the third air gap is an air gap between the conductor ring and the outer rotating ring.

[0020] The above-mentioned magnetically controlled differential mechanism with optimized heat dissipation adopts a flange-shaped magnet bracket, which expands the contact area between the magnet bracket and the main shaft and improves the heat conduction efficiency of the differential mechanism; at the same time, based on the air gap between the active ring and the passive ring, when the active ring and the passive ring rotate, the heat will be quickly transferred to the outside through thermal convection along with the flowing air, further improving the overall heat dissipation efficiency of the differential mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an axial cross-sectional view of an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "center", "longitudinal", "lateral", "up", "down", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] The embodiment of the utility model provides a magnetically controlled slip mechanism for optimizing heat dissipation, such as Figure 1 As shown, it includes two parts, an active ring and a passive ring. The active ring and the passive ring are arranged together on the same main shaft (not shown in the figure), and the two are arranged side by side in the axial direction of the main shaft, that is, their respective ends are arranged relative to each other. The passive ring is set on the main shaft through a bearing sleeve, so there is no power transmission between the passive ring and the main shaft; the active ring is fixed to the main shaft by machine screws, so the active ring rotates with the rotation of the main shaft. Magnets are used to realize power transmission between the active ring and the passive ring, that is, the overall power transmission link sequence is main shaft-active ring-passive ring.

[0027] Specifically, the active ring includes an annular magnet support 1 and a plurality of magnets 6, the magnets 6 are distributed in an annular array on the magnet support 1 with the rotation axis of the magnet support 1 as the center, that is, they are arranged with radial uniform division. Corresponding to the position of the magnet 6, a conductor ring 4 is arranged on the passive ring, and the direction of the magnetic field of the conductor ring 4 and the magnet 6 are spatially orthogonal. Furthermore, the conductor ring 4 is made of a metal material that can cut the magnetic flux lines and generate Foucault current, such as aluminum or aluminum alloy. When the main shaft drives the active ring to rotate, the conductor ring 4 and the magnet 6 produce relative rotation. At this time, the conductor ring 4 cuts the magnetic flux lines to generate Foucault current. At this time, the conductor ring 4 acts as a charged conductor in the magnetic field, and will be subjected to an Ampere force in the same direction as the rotation of the active ring, causing the passive ring 4 to rotate, thereby realizing the aforementioned power transmission between the active ring and the passive ring.

[0028] It should be noted that when Foucault current is generated inside the metal, heat will be generated at the same time. The greater the current, the more heat will be generated. At the same time, the greater the current, the greater the Ampere force it generates, which is reflected in the slip mechanism as the greater the winding force, and at the same time, the more heat will be generated. When the magnet approaches or exceeds its own Curie temperature, the magnet will be demagnetized. Therefore, the magnetically controlled slip mechanism needs to have good heat dissipation conditions to ensure that the temperature of the magnet does not rise to the Curie point. In this embodiment, the magnet 6 is arranged on the magnet bracket 1, and the magnet bracket 1 is directly fixed on the main shaft. Since the outer ring of the entire slip mechanism will also be sleeved with gears and the winding drum of the material, the main heat dissipation method of the magnet 6 is to transfer the heat to the main shaft for heat dissipation by heat conduction. In this embodiment, the technical solution to the technical problem is to increase the contact area between the magnet bracket 1 and the main shaft to improve the heat conduction efficiency.

[0029] Specifically, the magnet bracket 1 is flange-shaped, and the direction of the boss 8 of the flange faces the conductor ring 4. The magnet 6 is installed on the flange of the flange, and similarly, it is also on the side facing the conductor ring 4. The top of the boss 8 (the end away from the flange) extends toward the passive ring until it contacts the inner ring of the bearing 3 of the passive ring, at which time the conductor ring 4. The wall thickness of the boss 8 corresponding to the conductor ring 4 and the magnet 6 is different. Specifically, the wall thickness corresponding to the conductor ring 4 is much smaller than the wall thickness of the corresponding position of the magnet 6. It should be known that during operation, the conductor ring 4 is a heat source, which will dissipate heat to the surroundings. Based on its working principle, there is no contact between the conductor ring 4 and the active ring. The conductor ring 4 is only fixedly connected to the outer rotating ring 2 of the passive ring. Therefore, there are two ways of heat transfer to the surroundings, one is heat conduction with the outer rotating ring 2, and the other is heat convection to the air gap around it. It should be noted that, assuming that each object has the same thermal conductivity coefficient and the same thermal convection boundary conditions, under this condition, the volume of the object is inversely proportional to the heat receiving rate, and relatively speaking, the surface area of ​​the object is directly proportional to the heat dissipation rate. To illustrate with an actual case: two objects of the same material, one thick and one thin, one end is in contact with a heat source, and the end away from the heat source must be the thinner object that heats up faster. Compared with heat dissipation, thin geometry has a larger specific surface area and provides convection heat dissipation. This is why heat sinks are generally very thin, in order to achieve rapid heat conduction and heat dissipation. In this embodiment, this principle is utilized to set different wall thicknesses in a targeted manner, so that the corresponding conductor ring 4 position on the boss 8 can absorb the heat of thermal convection in the air gap more quickly, reducing the impact of thermal convection on the magnet 6. Different wall thickness settings, combined with the combination of two solutions to expand the contact area, further enhance the heat dissipation efficiency of the slip mechanism and reduce the risk of high-temperature demagnetization of the magnet 6.

[0030] Furthermore, refer to Figure 2 The air gaps between the conductor ring 4 and the magnet 6, the magnet bracket 1, and the bearing 3 are respectively the first air gap 11, the second air gap 12, and the third air gap 13. These three air gaps are connected, and the first air gap 11 is connected to the outside. During the rotation of the active ring and the passive ring, the air in the air gap will.

[0031] It should be noted that a gear-shaped outer ring for fixing the material roll core is also provided on the outside of the magnetically controlled slip mechanism in the present embodiment. The heat generated by the conductor ring 4 during operation can be transferred to the gear-shaped outer ring by heat convection through the three air gaps mentioned above, and the heat is dissipated through the gear-shaped outer ring. Compared with the traditional method of dissipating heat only through the main shaft, the slip mechanism that combines the heat conduction of the main shaft and the heat radiation of the air gap has a better heat dissipation effect.

[0032] Furthermore, because the top of the boss 8 is in contact with the inner ring of the bearing 3, then, when the height of the boss 8 is determined, the thickness of the conductor ring 4 and the magnet 6 can be controlled to well control the distance between the conductor ring 4 and the magnet 6 after assembly, that is, the size of the aforementioned air gap. It should be noted that the size of this air gap is generally very small. An excessively large air gap will result in the inability to generate Foucault current in the conductor ring 4, and power transmission will not be achieved. Therefore, in the traditional solution, very high processing and assembly precision is required to meet this requirement, and the use of the boss 8 structure can well reduce the demand for assembly precision.

[0033] Furthermore, if Figure 2 As shown, the second step 10 and the first step 9 are respectively provided at the contact part between the outer rotating ring 2 and the conductor ring 4. The first step 9 and the second step 10 are interlocked to fix the conductor ring 4 on the outer rotating ring 2. That is, the first step 9 is provided on the conductor ring 4, and the protruding part is close to the outer edge, and the corresponding second step 10 is provided on the outer rotating ring 2, and the protruding part is close to the main axis. The outer diameter of the second step 10 should be smaller than the inner diameter of the first step 9, so that the two meet the condition of interference fit. In addition, glue can be applied to the contact surface of the two steps to assist fixation; or pin holes and pins can be provided on the contact surface for assembly. Of course, other fixed connection methods should also fall within the scope of this application. Compared with the previous screw fastening method, this assembly method can obtain a larger contact area to increase the heat conduction rate of the conductor ring 4 to the outside, and reduce the parts required for assembly, improve integrity, and reduce assembly difficulty.

[0034] Furthermore, the number of magnets 6 is a positive integer multiple of three or four, and the magnetic pole directions of the magnets 6 are arranged according to the Halbach principle, so that the magnetic field strength toward the conductor ring 4 is increased under the premise of setting the same number and specifications of magnets 6.

[0035] Furthermore, the passive ring is assembled with the main shaft through two bearings 3, and the two bearings 3 are respectively arranged at the two ends of the passive ring. Steps corresponding to the bearings 3 are arranged at the inner edges of the two ends of the outer rotating ring 2, that is, the inner edge of the outer rotating ring 2 is in a state of convexity in the middle. Correspondingly, a spacer ring 5 is also arranged on the main shaft, which is arranged in the middle of the two bearings 3. The width of the spacer ring 5 is consistent with the convexity of the inner edge of the outer rotating ring 2. After the two bearings 3 and the spacer ring 5 are installed, the two sides of the spacer ring 5 abut against the inner rings of the two bearings 3 respectively. In the heat dissipation system of this embodiment, after the heat of the conductor ring 4 is transferred to the outer rotating ring 2 through heat conduction, it will be transferred to the main shaft through the bearing 3. The setting of the spacer ring 5 expands the contact area between the bearing 3 and the main shaft, and assists in improving the heat conduction efficiency. In addition, the combination of the spacer ring 5 and the convexity in the middle of the inner edge of the outer rotating ring 2 can realize the installation and positioning of the bearing 3, can ensure the consistency of the assembly position of the bearing 3 of each passive ring, and can also increase the axial load of the bearing 3.

[0036] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A magnetically controlled slip mechanism for optimizing heat dissipation, comprising an active ring and a passive ring arranged axially, wherein the passive ring is assembled on the main shaft of the device through a bearing, and the active ring is sleeved on the main shaft and fixedly connected thereto, characterized in that: The inner edge of the active ring has an axial protrusion, the protrusion extends toward the passive ring, and the inner edge of the protrusion is in close contact with the main shaft; An air gap exists between the active ring and the passive ring, and the air gap is communicated with the outside.

2. The magnetically controlled slip mechanism according to claim 1, characterized in that: The active ring includes a flange-shaped bracket and a magnet mounted on the bracket; The magnet is arranged on the flange of the bracket and is located on a side facing the passive ring; There is an air gap between the magnet and the passive ring.

3. The magnetically controlled slip mechanism according to claim 2, characterized in that: There are a plurality of magnets, and the number is a positive integer multiple of three or four, and the magnets are arranged in a circular array on the bracket.

4. The magnetically controlled slip mechanism according to claim 3, characterized in that: The magnetic pole directions of the magnets are arranged according to the Halbach principle.

5. The magnetically controlled slip mechanism according to claim 2, characterized in that: One end of the protrusion close to the passive ring abuts against the inner ring of the bearing of the passive ring, and the magnet and the conductor ring of the passive ring are located on the periphery of the outer circumferential surface of the protrusion.

6. The magnetically controlled slip mechanism according to claim 5, characterized in that: The thickness of the portion of the protrusion corresponding to the conductor ring is smaller than the thickness of the portion corresponding to the magnet ring.

7. The magnetically controlled slip mechanism according to claim 1, characterized in that: The passive ring comprises an outer rotating ring and a conductor ring. The conductor ring is arranged on one end of the outer rotating ring close to the active ring. The conductor ring is fixedly connected to the outer rotating ring.

8. The magnetically controlled slip mechanism according to claim 7, characterized in that: Two steps in opposite directions are arranged on the contact surface of the conductor ring and the outer rotating ring, and the conductor ring and the outer rotating ring are fastened and assembled with each other through the two steps; there is an air gap between the conductor ring and the outer rotating ring.

9. The magnetically controlled slip mechanism according to claim 8, characterized in that: The air gaps between the conductor ring and the outer rotating ring and the passive ring include a first air gap, a second air gap and a third air gap; The first air gap, the second air gap and the third air gap are connected in sequence, and the first air gap is connected to the outside; The first air gap is an air gap between the conductor ring and the magnet, the second air gap is an air gap between the conductor ring and the protrusion, and the third air gap is an air gap between the conductor ring and the outer rotating ring.

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