High reliability liquid conductive slip ring

Abstract

The utility model provides a kind of high reliability liquid conductive slip ring belongs to conductive slip ring technical field, including shell, stator main shaft and rotor main shaft, rotor main shaft is rotatably connected by bearing and shell, is provided with rotor insulating sleeve and rotor shaft sleeve thereon, stator main shaft is provided with stator insulating sleeve, inner groove and outer groove are opened on rotor insulating sleeve, the end of stator insulating sleeve is abutted with outer groove and forms sealed cavity, rotor shaft sleeve is embedded in inner groove and will be fixed on rotor main shaft with rotor insulating sleeve, the end of rotor main shaft and the end of stator main shaft are all inserted into sealed cavity and are spaced apart, liquid conductive medium is provided in sealed cavity so that the end of rotor main shaft and the end of stator main shaft form electric connection;The utility model can firmly fix rotor insulating sleeve by rotor shaft sleeve, avoid its deviation or drop in rotation process;While increase the conductive contact area, improve the conductive capacity of liquid conductive slip ring, effectively reduce the risk of heating.

Description

Technical Field

[0001] This utility model relates to the field of conductive slip ring technology, and in particular to a highly reliable liquid conductive slip ring. Background Technology

[0002] Liquid conductive slip rings are key components for achieving electrical connection between two relatively rotating mechanisms. They are widely used in automated rotating equipment, precision instruments, wind turbine generators, rotary tables, and other scenarios. Their core function is to ensure stable power transmission between the fixed end and the rotating end while the component rotates continuously without restriction. This avoids the problems of equipment operation restrictions or line wear caused by the entanglement of traditional wires. They are an important component to ensure the efficient and reliable operation of rotating equipment.

[0003] The applicant's prior patent publication number CN220138907U discloses a liquid slip ring with corrosion resistance. However, the rotor insulation sleeve in the liquid slip ring is fixed by simple sleeve installation. Long-term rotation can easily cause axial displacement or detachment, leading to failure of the sealing structure. At the same time, the slip ring has a small conductive contact area, and it is easy to overheat due to current concentration during operation, which affects the service life and makes it difficult to meet the needs of high-precision, long-cycle operation equipment. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a highly reliable liquid conductive slip ring.

[0005] The technical solution adopted by this utility model is as follows: This application provides a highly reliable liquid conductive slip ring, including a housing, a stator spindle, and a rotor spindle. The rotor spindle is rotatably connected to the housing via bearings. One end of the rotor spindle extends into the housing and is provided with a rotor insulating sleeve and a rotor shaft sleeve. One end of the stator spindle extends into the housing and is provided with a stator insulating sleeve. The rotor insulating sleeve has an inner groove and an outer groove at the end facing the stator insulating sleeve. One end of the stator insulating sleeve abuts against the outer groove to form a sealed cavity. The rotor shaft sleeve is embedded in the inner groove and fixes the rotor insulating sleeve to the rotor spindle. The ends of the rotor spindle and the stator spindle both extend into the sealed cavity and are spaced apart. A liquid conductive medium is provided in the sealed cavity so that the ends of the rotor spindle and the ends of the stator spindle form an electrical connection.

[0006] In some embodiments, the rotor spindle is provided with a first shaft portion, a second shaft portion, a third shaft portion, and a fourth shaft portion in sequence along the axial direction from away from the sealing cavity to near the sealing cavity. The rotor insulating sleeve is provided with a stepped portion, which is sleeved on the third shaft portion and abuts against the end of the second shaft portion away from the stator spindle. The bearing inner ring is sleeved on the outer periphery of the second shaft portion and the outer periphery of the rotor insulating sleeve near the end of the second shaft portion. The end of the bearing near the stator spindle abuts against the stepped portion. The rotor bushing is disposed on the third shaft portion, and the fourth shaft portion extends into the sealing cavity.

[0007] In some embodiments, the housing is provided with a mounting groove for mounting a bearing, and the side wall of the mounting groove away from the sealing cavity is provided with a radially inwardly extending constricted flange, which abuts against the end face of the outer ring of the bearing to axially fix the bearing in the mounting groove.

[0008] In some embodiments, an annular groove is formed on the inner sidewall of the stepped portion near the bearing.

[0009] In some embodiments, a seal is abutted between the bearing and the mounting groove, and the inner side of the seal abuts against the rotor insulating sleeve.

[0010] In some embodiments, the stator insulating sleeve is provided with a first ring portion and a second ring portion in sequence along the axial direction from near the sealing cavity to away from the sealing cavity. The inner diameter of the first ring portion is larger than the inner diameter of the second ring portion. The second ring portion is interference-fitted onto the outer periphery of the stator spindle, so that the stator insulating sleeve is fixedly connected to the stator spindle. The first ring portion extends into the outer groove to form an abutment.

[0011] In some embodiments, an elastic cotton and a sealing gasket are sequentially arranged in the outer groove of the rotor insulating sleeve along the direction from the bottom of the groove to the opening of the groove. The first ring extends into the outer groove and abuts against the sealing gasket. The elastic cotton is used to apply axial preload to the sealing gasket after being compressed, so as to enhance the sealing performance between the sealing gasket and the first ring.

[0012] In some embodiments, the end of the rotor spindle away from the sealing cavity extends outside the housing, and a dust cover is fitted around the outer periphery of this end. The end of the dust cover near the housing covers the outer side of the end of the housing and is provided with a dust cover pressure plate. A sealing groove for accommodating a sealing sheet is formed between the dust cover and the dust cover pressure plate, and the inner sidewall of the sealing sheet abuts against the outer peripheral wall of the housing.

[0013] In some embodiments, a boss is provided on the outer periphery of the end of the rotor spindle extending out of the housing, and a fixing nut is provided on the end of the rotor spindle extending out of the boss, with the axial end face of the fixing nut abutting against the end face of the dust cover away from the housing.

[0014] In some embodiments, a sealing ring is provided between the rotor spindle and the dust cover.

[0015] The beneficial effects of this utility model are as follows: By embedding the rotor shaft sleeve into the inner groove of the rotor insulating sleeve, the rotor insulating sleeve can be firmly fixed, preventing it from shifting or falling off during rotation; at the same time, the ends of the rotor main shaft and the stator main shaft both extend into the sealing cavity, increasing the conductive contact area and improving the conductivity of the liquid conductive slip ring, which can effectively reduce the risk of overheating. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a cross-sectional view of the overall structure of a highly reliable liquid conductive slip ring according to this utility model; Figure 2 This is a partial schematic diagram of a high-reliability liquid conductive slip ring according to the present invention. Figure 1 ; Figure 3 This is a partial schematic diagram of a high-reliability liquid conductive slip ring according to the present invention. Figure 2 ; Figure 4 This is a partial schematic diagram of a high-reliability liquid conductive slip ring according to the present invention. Figure 3 . Detailed Implementation

[0018] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0021] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0022] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of this application.

[0023] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0025] Existing liquid conductive slip rings often suffer from problems such as loose rotor insulation sleeves that easily fall off, misalignment of the sealing cavity leading to leakage of the liquid conductive medium, and poor dustproof sealing performance, making them susceptible to external contamination and affecting the long-term stable operation of the equipment. Based on these problems, this utility model proposes a highly reliable liquid conductive slip ring, such as... Figures 1-4 As shown: The overall structure of the slip ring is based on the outer shell 1 as the basic supporting component. The interior of the outer shell 1 forms an installation space for accommodating the rotor spindle 3, the stator spindle 2, and related sealing and insulating components. The rotor spindle 3 is rotatably connected to the outer shell 1 through a bearing 4. The bearing 4 provides stable support for the rotation of the rotor spindle 3 and reduces rotational friction. The rotor main shaft 3 is provided with a first shaft portion 31, a second shaft portion 32, a third shaft portion 33, and a fourth shaft portion 34 with decreasing outer diameters along the axial direction from away from the sealing cavity 8 to near the sealing cavity 8. This stepped shaft portion design facilitates the positioning and installation of each component. The rotor insulating sleeve 5 is sleeved on the outer periphery of the third shaft portion 33, and its end away from the stator main shaft 2 abuts against the end of the second shaft portion 32 to achieve preliminary axial positioning. The inner ring of the bearing 4 is sleeved on the outer periphery of the second shaft portion 32 and the outer periphery of the end of the rotor insulating sleeve 5 near the second shaft portion 32. The outer diameter of this end is consistent with the outer diameter of the second shaft portion 32 to ensure that the inner ring of the bearing fits tightly. The end of the bearing 4 near the stator main shaft 2 abuts against the stepped portion 51 on the rotor insulating sleeve 5 to further restrict the axial displacement of the rotor insulating sleeve 5.

[0026] Furthermore, an annular groove 52 is provided on the inner side wall of the stepped portion 51 near the bearing 4. The annular groove 52 can reduce the contact area between the stepped portion 51 and the bearing 4, reduce the frictional resistance during rotation, and also accommodate small impurities generated during assembly, so as to avoid impurities affecting the rotational accuracy of the bearing 4.

[0027] The housing 1 has a mounting groove 11 for mounting the bearing 4 at the position corresponding to the bearing 4. The side wall of the mounting groove 11 away from the sealing cavity 8 has a radially inwardly extending constricted flange 12. The constricted flange 12 abuts against the end face of the outer ring of the bearing 4, axially fixing the bearing 4 in the mounting groove 11 and preventing the bearing 4 from axially moving during the rotation of the rotor main shaft 3.

[0028] Furthermore, a seal 13 is abutted between the bearing 4 and the mounting groove 11. The inner side of the seal 13 abuts against the rotor insulating sleeve 5, which can block external dust, water vapor and other impurities from entering the gap between the bearing 4 and the sealing cavity 8, thus ensuring the lubrication performance of the bearing 4 and the sealing performance of the sealing cavity 8.

[0029] The rotor shaft 3 is also provided with a rotor bushing 6 on the third shaft portion 33. The rotor insulating sleeve 5 has an inner groove 500 and an outer groove 501 at the end facing the stator insulating sleeve 7. The inner groove 500 and the outer groove 501 are annular grooves. The rotor bushing 6 is embedded in the inner groove 500, which can firmly fix the rotor insulating sleeve 5 on the third shaft portion 33 of the rotor shaft 3, and completely avoid the problem of the rotor insulating sleeve 5 shifting or falling off during long-term rotation.

[0030] One end of the stator spindle 2 extends into the housing 1, and a stator insulating sleeve 7 is fitted around its outer periphery. The stator insulating sleeve 7 has a first ring portion 71 and a second ring portion 72 arranged sequentially along the axial direction from near the sealing cavity 8 to away from the sealing cavity 8. The second ring portion 72 is interference-fitted onto the outer periphery of the stator spindle 2 to achieve a firm fixation between the stator insulating sleeve 7 and the stator spindle 2. The first ring portion 71 extends into the outer groove 501 of the rotor insulating sleeve 5 and abuts against the outer groove 501. The two cooperate to form a sealing cavity 8 for accommodating the liquid conductive medium 9. The fourth shaft portion 34 of the rotor spindle 3 and the end of the stator spindle 2 both extend into the sealing cavity 8 and are spaced apart. The liquid conductive medium 9, such as liquid gallium alloy or liquid mercury, filled in the sealing cavity 8 simultaneously contacts the fourth shaft portion 34 and the end of the stator spindle 2, forming a stable conductive path to realize the power transmission between the rotor spindle 3 and the stator spindle 2.

[0031] In addition, elastic cotton 81 and sealing gasket 82 are sequentially arranged in the outer groove 501 of the rotor insulating sleeve 5 along the direction from the bottom of the groove to the opening of the groove. The first ring 71 extends into the outer groove 501 and abuts against the sealing gasket 82. After the elastic cotton 81 is compressed, it applies a continuous axial preload to the sealing gasket 82, so that the sealing gasket 82 is always tightly fitted with the first ring 71, which significantly enhances the sealing performance of the sealing cavity 8 and effectively prevents the leakage of liquid conductive medium 9.

[0032] In some embodiments, one end of the rotor shaft 3 away from the sealing cavity 8 extends outside the outer casing 1, and a dust cover 10 is fitted around the outer periphery of this end. The end of the dust cover 10 near the outer casing 1 covers the outer side of the end of the outer casing 1, which can prevent external dust and impurities from directly entering the interior of the outer casing 1. A dust cover pressure plate 14 is also provided on the outer side of the dust cover 10. A sealing groove for accommodating the sealing sheet 15 is formed between the dust cover 10 and the dust cover pressure plate 14. The inner sidewall of the sealing sheet 15 abuts against the outer peripheral wall of the outer casing 1, further enhancing the sealing effect between the dust cover 10 and the outer casing 1.

[0033] Furthermore, a boss 35 is provided on the outer periphery of the end of the rotor shaft 3 extending out of the outer casing 1. In this embodiment, the boss 35 is equivalent to the first shaft 31. A fixing nut 16 is threadedly connected to the end of the rotor shaft 3 extending out of the boss 35. The axial end face of the fixing nut 16 abuts against the end face of the dust cover 10 away from the outer casing 1, clamping and fixing the dust cover 10 between the boss 35 and the fixing nut 16, ensuring that the dust cover 10 rotates synchronously with the rotor shaft 3. At the same time, a sealing ring 17 is provided between the rotor shaft 3 and the dust cover 10 to prevent external impurities from entering the interior of the outer casing 1 from the gap between the rotor shaft 3 and the dust cover 10, further improving the overall dustproof and sealing performance of the slip ring.

[0034] When the slip ring is running, the rotor spindle 3 rotates relative to the housing 1 and the stator spindle 2 under the action of external driving force through the bearing 4. The liquid conductive medium 9 in the sealing cavity 8 always maintains contact with the fourth shaft part 34 of the rotor spindle 3 and the end of the stator spindle 2, realizing stable power transmission between the rotating end (rotor spindle 3) and the fixed end (stator spindle 2). The dust cover 10, sealing plate 15, sealing ring 17 and other structures effectively prevent external impurities from entering and extend the service life of the slip ring.

[0035] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0036] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0037] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A highly reliable liquid conductive slip ring, characterized in that, The device includes a housing, a stator spindle, and a rotor spindle. The rotor spindle is rotatably connected to the housing via bearings. One end of the rotor spindle extends into the housing and is fitted with a rotor insulating sleeve and a rotor shaft sleeve. One end of the stator spindle extends into the housing and is fitted with a stator insulating sleeve. The rotor insulating sleeve has an inner groove and an outer groove at the end facing the stator insulating sleeve. One end of the stator insulating sleeve abuts against the outer groove to form a sealed cavity. The rotor shaft sleeve is embedded in the inner groove and fixes the rotor insulating sleeve to the rotor spindle. The ends of the rotor spindle and the stator spindle both extend into the sealed cavity and are spaced apart. A liquid conductive medium is provided in the sealed cavity to form an electrical connection between the ends of the rotor spindle and the ends of the stator spindle.

2. The high-reliability liquid conductive slip ring according to claim 1, characterized in that, The rotor main shaft is provided with a first shaft section, a second shaft section, a third shaft section, and a fourth shaft section in sequence along the axial direction from away from the sealing cavity to near the sealing cavity. The rotor insulating sleeve is provided with a stepped portion, which is sleeved on the third shaft section and abuts against the end of the second shaft section. The inner ring of the bearing is sleeved on the outer circumference of the second shaft section and the outer circumference of the end of the rotor insulating sleeve near the second shaft section. The end of the bearing near the stator main shaft abuts against the stepped portion. The rotor bushing is disposed on the third shaft section, and the fourth shaft section extends into the sealing cavity.

3. The high-reliability liquid conductive slip ring according to claim 2, characterized in that, The housing is provided with a mounting groove for mounting the bearing. The side wall of the mounting groove away from the sealing cavity is provided with a radially inwardly extending constricted flange. The constricted flange abuts against the end face of the outer ring of the bearing, thereby axially fixing the bearing in the mounting groove.

4. The high-reliability liquid conductive slip ring according to claim 2, characterized in that, The inner wall of the stepped portion near the bearing side has an annular groove.

5. A high-reliability liquid conductive slip ring according to claim 3, characterized in that, A seal is abutting between the bearing and the mounting groove, and the inner side of the seal abuts against the rotor insulating sleeve.

6. The high-reliability liquid conductive slip ring according to claim 1, characterized in that, The stator insulating sleeve is provided with a first ring and a second ring in sequence along the axial direction from near the sealing cavity to away from the sealing cavity. The inner diameter of the first ring is larger than the inner diameter of the second ring. The second ring is interference-fitted onto the outer circumference of the stator main shaft, so that the stator insulating sleeve is fixedly connected to the stator main shaft. The first ring extends into the outer groove to form an abutment.

7. A high-reliability liquid conductive slip ring according to claim 6, characterized in that, Elastic cotton and a sealing gasket are sequentially arranged in the outer groove of the rotor insulating sleeve along the direction from the bottom of the groove to the opening of the groove. The first ring extends into the outer groove and abuts against the sealing gasket. The elastic cotton is used to apply axial pre-tightening force to the sealing gasket after being compressed, so as to enhance the sealing performance between the sealing gasket and the first ring.

8. A high-reliability liquid conductive slip ring according to claim 1, characterized in that, The rotor spindle extends out of the outer casing at one end away from the sealing cavity. A dust cover is fitted around the outer periphery of this end. The end of the dust cover near the outer casing covers the outer side of the end of the outer casing and is provided with a dust cover pressure plate. A sealing groove for accommodating a sealing sheet is formed between the dust cover and the dust cover pressure plate. The inner sidewall of the sealing sheet abuts against the outer peripheral wall of the outer casing.

9. A high-reliability liquid conductive slip ring according to claim 8, characterized in that, The rotor spindle has a boss on the outer periphery of the end extending out of the housing. A fixing nut is provided at the end of the rotor spindle extending out of the boss, and the axial end face of the fixing nut abuts against the end face of the dust cover away from the housing.

10. A high-reliability liquid conductive slip ring according to claim 9, characterized in that, A sealing ring is provided between the rotor spindle and the dust cover.

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