Precise conductive slip ring body

Abstract

The invention discloses a precise conductive slip ring body which comprises a mandrel assembly, a left end insulating ring piece, a ring piece assembly, a potting body, a right end insulating ring piece, a rotation stopping ring and a locking nut. The mandrel assembly is of a three-split-shaft structure and sequentially comprises a left half shaft, a connecting shaft and a right half shaft. The left end part insulating ring sheet is radially positioned on the left half shaft; the ring sheet assembly comprises a signal ring sheet assembly, a power ring sheet assembly and an inter-ring insulation sheet; the signal ring sheet assembly and the power ring sheet assembly are spaced by the inter-ring insulating sheet, are axially arranged to the right end insulating ring sheet along the connecting shaft, and are pressed on the right half shaft by the locking nut through the rotation stopping ring; and the encapsulation body is encapsulated in the ring body. The conductive ring body provided by the invention eliminates or reduces the thermal stress between the structures, ensures that the structure size is stable under the same environment profile within the life cycle, and has higher signal transmission stability at the end of the life; the locking compression amount can be controlled uniformly, continuously and quantitatively, and the ring piece compression process is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electricity transmission, in particular to a precision conductive slip ring. BACKGROUND

[0002] The precision conductive slip ring is used to realize the electricity transmission between the relative rotating components on the mechanical device, such as the test turntable in the inertial equipment, the solar cell wing driving mechanism of the aircraft, etc. The precision conductive slip ring is generally composed of a ring body, a ring brush and a support structure. Taking the solar cell wing driving mechanism of the aircraft as an example, the ring body is connected with the circuit of the solar cell wing through a wire, the ring brush is connected with the circuit of the battery in the cabin of the aircraft through the wire, the electricity communication between the battery of the aircraft and the solar cell wing is realized through the contact between the ring piece on the ring body and the ring brush, and the stable transmission of power and signal is ensured during the relative rotation of the two.

[0003] Due to the change of the loop resistance and the heat dissipation environment, the precision conductive slip ring ring body will bear thousands of times of temperature changes during the service life, and the temperature change will cause the change of the ring body structure and the internal stress. The change of the axial size of the ring body structure is not conducive to the stability of the contact between the ring body and the ring brush, which leads to the amplification of the transmission signal noise and even the end jump brush failure. The reciprocating alternating internal stress will cause the creep or failure of the insulating material, further cause the structure deformation, and finally cause the conductive slip ring to not meet the use requirements, resulting in the interruption of the energy supply of the electromechanical device. SUMMARY

[0004] In order to solve the above problems, the present application provides a precision conductive slip ring ring body.

[0005] The specific technical scheme of the present application is as follows:

[0006] The precision conductive slip ring ring body can realize 24-way and 36-way power transmission at the same time, and comprises a mandrel assembly, a left end insulating ring piece, a ring piece assembly, a right end insulating ring piece, a rotation-stopping ring, a locking nut and a pouring body.

[0007] The mandrel assembly adopts a three-part shaft structure and comprises a left half shaft, a connecting shaft and a right half shaft. The left half shaft and the right half shaft are connected with the connecting shaft. The connecting shaft is made of the same material as the brush support or has the same equivalent thermal expansion coefficient through structure optimization, so that the brush contact stability can be ensured at high and low temperatures, and the transmission of the electrical signal is stable and no jump brush failure occurs. The connecting shaft can be made of the same material as the brush support to form an integral part. Alternatively, two or more materials can be used to determine the axial total size ratio of the material parts according to the equivalent thermal expansion coefficient, and the same thermal expansion coefficient as the brush support can be realized through splicing. The material of the connecting shaft is 7A04, and the thermal expansion coefficient is 23ppm.

[0008] The left end insulating ring piece is positioned radially on the left half shaft.

[0009] The ring piece assembly comprises a signal ring piece assembly, a power ring piece assembly and an inter-ring insulation piece; the signal ring piece assembly and the power ring piece assembly are arranged axially along the connecting shaft to the right end insulation ring piece through the inter-ring insulation piece, and are compressed on the right half shaft by the locking nut and the rotation-stopping ring; the signal ring piece assembly and the power ring piece assembly are insulated once through the inter-ring insulation piece, the left end insulation ring piece and the right end insulation ring piece; the combination of the signal ring piece assembly, the power ring piece assembly, the inter-ring insulation piece, the left end insulation ring piece and the right end insulation ring piece is locked by the locking nut, so that the locking compression amount is uniformly, continuously and quantitatively controlled, and the penetration of electrolyte in the ring channel gold plating process is effectively prevented;

[0010] The signal ring piece assembly comprises a signal ring piece and a signal ring piece insulation piece; the signal ring piece and the signal ring piece insulation piece are both several; the signal ring piece insulation piece is located between every two signal ring pieces;

[0011] The power ring piece assembly comprises a power ring piece and a power ring piece insulation piece; the power ring piece and the power ring piece insulation piece are both several; the power ring piece insulation piece is located between every two power ring pieces;

[0012] The potting body is filled in the ring body to perform secondary insulation on the ring body, and further improve the electrical insulation characteristics of the ring body; the ring body is formed by a mandrel assembly and a ring piece assembly.

[0013] Further, a boss is arranged radially in the inner circle of the rotation-stopping ring; in the pre-tightening process, the rotation-stopping ring is restricted in the rotation freedom around the shaft by the boss and the right half shaft, so that the locked part is effectively prevented from rotating axially and only compressed axially; the contact surface between the rotation-stopping ring and the locking nut is coated with a lubricant; the lubricant is MoS2, which ensures the stability of the sliding friction coefficient of the locking nut in the screwing process and facilitates the pre-tightening force control when compressed.

[0014] Further, a 90° single V-shaped and a 90° double V-shaped ring groove are arranged respectively on the signal ring piece and the power ring piece for cooperating with the brush; the ring groove surface is plated with a noble metal alloy for conducting electricity and prolonging the service life of the assembly; the noble metal alloy is palladium-nickel-gold alloy.

[0015] Further, an injection hole, an external thread and a groove are arranged on the right half shaft; the groove cooperates with the boss and can slide axially relative to the boss; the injection hole is used for injecting the potting body into the inner cavity of the ring body; the external thread is used for cooperating with the locking nut.

[0016] Further, the signal ring piece, the power ring piece, the ring-to-ring insulation piece, the left end insulation ring piece and the right end insulation ring piece combination has the same or similar equivalent thermal expansion coefficient as the connecting shaft in the mandrel assembly, so that the compressed part and the compressed part have similar axial thermal expansion when the temperature changes, the stress level caused by the forced deformation of the non-metal ring-to-ring insulation piece is reduced, the structural creep is eliminated or delayed, the structural size is stable under the environmental profile in the service life, and finally the long service life requirement of the precision conductive slip ring is ensured.

[0017] Further, by changing the size of the ring-to-ring insulation piece, the equivalent thermal expansion coefficient of the signal ring piece, the power ring piece, the ring-to-ring insulation piece, the left end insulation ring piece and the right end insulation ring piece combination can be conveniently realized to be the same or similar to the mandrel assembly without changing the size of the designed part.

[0018] Further, the left half shaft is provided with a glue overflow hole; the glue overflow hole is used to form a 100% filling body in the ring body cavity.

[0019] The filling body is an insulating glue solution, and the Young's modulus after curing is lower than that of the connecting shaft, and the thermal expansion coefficient is similar to that of the connecting shaft; the insulating glue solution is selected to be a heat-conducting enhanced epoxy glue, and the thermal expansion coefficient is 22ppm-26ppm.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] 1、The signal ring piece, the power ring piece, the ring-to-ring insulation piece, the left end insulation ring piece and the right end insulation ring piece combination have the same or similar equivalent thermal expansion coefficient as the connecting shaft in the mandrel assembly, so that the compressed part and the compressed part have similar axial thermal expansion when the temperature changes, the stress level caused by the forced deformation of the non-metal ring-to-ring insulation piece is reduced, the structural creep is eliminated or reduced, the structural size is stable under the environmental profile in the service life, and finally the long service life requirement of the precision conductive slip ring is ensured;

[0022] 2、The Young's modulus of the filling body after curing is much lower than that of the connecting shaft or the thermal expansion coefficient is similar to that of the connecting shaft, the stress level in the ring body is reduced when the temperature changes, and the signal transmission stability at the end of the service life is higher;

[0023] 3. Compared with the prior art screw stack ring pre-tightening technology, the application realizes uniform, continuous and quantitative control of locking compression amount by locking the signal ring piece assembly, power ring piece assembly, inter-ring insulation piece, left end insulation ring piece and right end insulation ring piece combination body through the locking nut, effectively prevents electrolyte penetration in the ring channel gold plating process, and greatly simplifies the ring piece compression process. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is the axial view of the precision conductive slip ring ring body of the present application;

[0026] Figure 2 is the main sectional view of the precision conductive slip ring ring body of the present application;

[0027] Figure 3 is the schematic diagram of the mandrel assembly of the precision conductive slip ring ring body of the present application;

[0028] Figure 4 is the schematic diagram of the ring piece assembly of the precision conductive slip ring ring body of the present application;

[0029] Figure 5 is the schematic diagram of the right half shaft of the precision conductive slip ring ring body of the present application;

[0030] Figure 6 is the schematic diagram of the precision conductive slip ring ring body of the present application.

[0031] The various marks in the drawings represent:

[0032] 2 is the left end insulation ring piece; 4 is the potting body; 5 is the right end insulation ring piece; 6 is the anti-rotation ring; 7 is the locking nut; 10 is the mandrel assembly; 11 is the left half shaft; 12 is the connecting shaft; 13 is the right half shaft; 30 is the ring piece assembly; 31 is the signal ring piece assembly; 311 is the signal ring piece; 312 is the signal ring insulation piece; 32 is the power ring piece assembly; 321 is the power ring piece; 322 is the power ring insulation piece; 33 is the inter-ring insulation piece; 13-1 is the glue injection hole; 13-2 is the groove; 13-3 is the external thread; 61 is the boss. DETAILED DESCRIPTION

[0033] Following, the embodiments of the present application will be described in detail by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification. The present application can also be implemented or applied by other different embodiments, and various modifications or changes can be made to the details in the present specification based on different views and applications without departing from the spirit of the present application.

[0034] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concepts of the present application, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be a random change, and the component layout pattern can be more complex.

[0035] The following will be described in detail in combination with the accompanying drawings Figures 1-6 The present application will be further described in detail:

[0036] A precise conductive slip ring body, which can simultaneously realize 24-way and 36-way power transmission, as shown in Figure 1 and Figure 2 The body comprises a mandrel assembly 10, a left end insulating ring piece 2, a ring piece assembly 30, a potting body 4, a right end insulating ring piece 5, a rotation-stopping ring 6, and a locking nut 7.

[0037] As shown in Figure 3 The mandrel assembly 10 adopts a three-part shaft structure, comprising a left half shaft 11, a connecting shaft 12, and a right half shaft 13. The left half shaft 11 and the right half shaft 13 are connected with the connecting shaft 12. The connecting shaft 12 is made of the same material as the ring brush support or has the same equivalent thermal expansion coefficient through structure optimization, so as to ensure the stability of the brush contact at high and low temperatures, and further ensure the stability of the electrical signal transmission and the absence of brush skipping failure. The connecting shaft 12 can be made of the same material as the ring brush support to form an integral part. Alternatively, two or more materials can be used to determine the axial total size proportion of the material parts according to the equivalent thermal expansion coefficient, and the same thermal expansion coefficient as the ring brush support can be achieved through splicing. The material of the connecting shaft 12 is 7A04, and the thermal expansion coefficient is 23ppm.

[0038] The left end insulating ring piece 2 is positioned radially on the left half shaft 11.

[0039] As shown in Figure 2As shown, the ring piece assembly comprises a signal ring piece assembly 31, a power ring piece assembly 32 and an inter-ring insulation piece 33; the signal ring piece assembly 31 and the power ring piece assembly 32 are arranged axially along the connecting shaft 12 to the right end insulation ring piece 5 through the inter-ring insulation piece 33, and are compressed on the right half shaft 13 by the locking nut 7 via the rotation-stopping ring 6; the signal ring piece assembly 31 and the power ring piece assembly 32 are insulated once through the inter-ring insulation piece 33, the left end insulation ring piece 2 and the right end insulation ring piece 5; the combination of the signal ring piece assembly 31, the power ring piece assembly 32, the inter-ring insulation piece 33, the left end insulation ring piece 2 and the right end insulation ring piece 5 is locked by the locking nut 7, so as to realize uniform, continuous and quantitative control of the locking compression amount and effectively prevent electrolyte from penetrating during the gold plating of the ring channel.

[0040] The signal ring piece assembly 31 comprises signal ring pieces 311 and signal ring insulation pieces 312; both the signal ring pieces 311 and the signal ring insulation pieces 312 are several; the signal ring insulation pieces 312 are located between every two signal ring pieces 311.

[0041] The power ring piece assembly 32 comprises power ring pieces 321 and power ring insulation pieces 322; both the power ring pieces 321 and the power ring insulation pieces 322 are several; the power ring insulation pieces 322 are located between every two power ring pieces 321.

[0042] The potting body 4 is filled in the ring body to perform secondary insulation on the ring body, so as to further improve the electrical insulation characteristics of the ring body; the ring body is formed by the mandrel assembly 10 and the ring piece assembly 30.

[0043] As shown in the figure, Figure 5 The inner circle of the rotation-stopping ring 6 is provided with a boss 61 in the radial direction; during the pre-tightening process, the rotation-stopping ring 6 is restricted in the rotation freedom around the shaft by the boss 61 and the right half shaft 13, so as to effectively prevent the locked part from rotating axially and only compressing axially; the contact surface of the rotation-stopping ring 6 and the locking nut 7 is coated with a lubricant; the lubricant is MoS2, so as to ensure the stability of the sliding friction coefficient of the locking nut 7 during the screwing process and facilitate the pre-tightening force control during the compression.

[0044] The signal ring piece 311 and the power ring piece 321 are respectively provided with 90° single V-shaped and 90° double V-shaped ring grooves for cooperating with the brush; the surface of the ring groove is plated with a noble metal alloy for conducting electricity and prolonging the service life of the assembly; the noble metal alloy is palladium-nickel-gold alloy.

[0045] As shown in the figure, Figure 4As shown, the right half shaft 13 is provided with a glue injection hole 13-1, an external thread 13-3 and a groove 13-2; the groove 13-2 is matched with the boss 61 and can slide relatively in the axial direction; the glue injection hole 13-1 is used for pouring the potting body 4 into the inner cavity of the ring body; and the external thread 13-3 is used for matching the lock nut 7.

[0046] The signal ring sheet 311, the power ring sheet 321, the inter-ring insulation sheet 33, the left end insulation ring sheet 2 and the right end insulation ring sheet 5 combination has the same or similar equivalent thermal expansion coefficient as the connecting shaft 12 in the mandrel assembly 10, so that the similar axial thermal expansion of the compressed part and the compressed part can be ensured when the temperature changes, the stress level caused by the forced deformation of the non-metal insulation sheet is reduced, the thermal stress between structures is eliminated or reduced, the stability of the structure size and the environmental profile in the service life is ensured, and finally the long service life requirement of the precision conductive slip ring is ensured. Wherein: the materials of the power ring sheet 311 and the signal ring sheet 321 are 62 brass, the materials of the signal ring insulation sheet 312, the power ring insulation sheet 322 and the inter-ring insulation sheet 33 are imide YS-20, and the total thickness of the two materials accounts for 63.8% and 36.2%, respectively, and the equivalent thermal expansion coefficient is 23.22ppm.

[0047] By changing the size of the signal ring insulation sheet 312, the power ring insulation sheet 322 and the inter-ring insulation sheet 33, the equivalent thermal expansion coefficient of the signal ring sheet 311, the power ring sheet 321, the inter-ring insulation sheet 33, the left end insulation ring sheet 2 and the right end insulation ring sheet 5 combination can be conveniently realized without changing the size of the designed parts.

[0048] The left half shaft 11 is provided with a glue overflow hole; the glue overflow hole is used to form the potting body 4 in the ring body inner cavity 100%;

[0049] The potting body 4 is an insulation glue liquid, and the Young's modulus after curing is lower than that of the connecting shaft 12, and the thermal expansion coefficient is similar to that of the connecting shaft 12; the insulation glue liquid selects a heat-conducting enhanced epoxy glue, and the thermal expansion coefficient is 22ppm-26ppm.

[0050] Although the present application has been disclosed with the above preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application according to the above disclosure without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not deviate from the technical solutions of the present application, belongs to the protection scope of the technical solutions of the present application.

Claims

1. A precision electrically conductive slip ring ring body, characterized by, The application relates to a coaxial cable connector, which comprises a mandrel assembly (10), a left end insulation ring piece (2), a ring piece assembly (30), a pouring body (4), a right end insulation ring piece (5), a rotation-stopping ring (6) and a locking nut (7). The mandrel assembly (10) adopts a three-part shaft structure and sequentially comprises a left half shaft (11), a connecting shaft (12) and a right half shaft (13). The left end insulation ring piece (2) is radially positioned on the left half shaft (11). The ring piece assembly (30) comprises a signal ring piece assembly (31), a power ring piece assembly (32) and an inter-ring insulation piece (33); the signal ring piece assembly (31) and the power ring piece assembly (32) are axially arranged to the right end insulation ring piece (5) along the connecting shaft (12) after being spaced by the inter-ring insulation piece (33) and are compressed on the right half shaft (13) by the locking nut (7) through the rotation-stopping ring (6). The signal ring piece assembly (31) and the power ring piece assembly (32) are once insulated by the inter-ring insulation piece (33), the left end insulation ring piece (2) and the right end insulation ring piece (5). The signal ring piece assembly (31) comprises signal ring pieces (311) and signal ring insulation pieces (312); the signal ring pieces (311) and the signal ring insulation pieces (312) are both provided with a plurality of pieces; the signal ring insulation pieces are located between every two signal ring pieces (311). The power ring piece assembly (32) comprises power ring pieces (321) and power ring insulation pieces (322); the power ring pieces (321) and the power ring insulation pieces (322) are both provided with a plurality of pieces; the power ring insulation pieces are located between every two power ring pieces (321). The pouring body (4) is poured in the ring body and performs secondary insulation on the ring body; the ring body is formed by the mandrel assembly (10) and the ring piece assembly (30).

2. A precision electrically conductive slip ring ring body as claimed in claim 1, wherein, The connecting shaft (12) and the ring brush support have the same equivalent thermal expansion coefficient.

3. A precision electrically conductive slip ring ring body as defined in claim 1, wherein, The inner ring of the rotation-stopping ring (6) is provided with a boss (61); during the pre-tightening process, the rotation-stopping ring (6) is restricted in the rotation freedom around the shaft by the boss (61) and the right half shaft (13); the contact surface between the rotation-stopping ring (6) and the locking nut (7) is coated with a lubricant.

4. A precision electrically conductive slip ring ring body as defined in claim 1, wherein, The signal ring pieces (311) and the power ring pieces (321) are respectively provided with 90-degree single V-shaped and 90-degree double V-shaped ring grooves for matching the electric brush; the ring groove surface is plated with a precious metal alloy for conducting electricity and prolonging the service life of the assembly.

5. A precision electrically conductive slip ring ring body as defined in claim 1, wherein, The right half shaft (13) is provided with a glue injection hole (13-1), an external thread (13-3) and a groove (13-2); The groove (13-2) cooperates with the boss (61) and slides along the axial direction; The glue injection hole (13-1) is used for pouring the pouring body (4) into the ring body cavity; The external thread (13-3) is used for matching the locking nut (7).

6. A precision electrically conductive slip ring ring body as defined in claim 1, wherein, The signal ring pieces (311), all the power ring pieces (321), the inter-ring insulation piece (33), the left end insulation ring piece (2), the right end insulation ring piece (5) and the connecting shaft (12) have the same or consistent equivalent thermal expansion coefficient.

7. A precision electrically conductive slip ring ring body as defined in claim 1, wherein, The left half shaft (11) is provided with a glue overflow hole.

8. A precision electrically conductive slip ring ring body as defined in claim 1, wherein, The potting body (4) is insulating glue solution, and the Young's modulus after curing is lower than that of the connecting shaft (12), and the thermal expansion coefficient is similar to that of the connecting shaft (12).

9. A precision electrically conductive slip ring ring body as defined in claim 3, wherein, The lubricant is MoS2, which ensures the stability of the sliding friction coefficient of the lock nut (7) during screwing, and facilitates the pre-tightening force control during compression.

10. A precision electrically conductive slip ring ring body as defined in claim 8, wherein, The insulating glue solution is heat-conducting and enhanced epoxy glue.

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