High-reliability multi-channel optical fiber rotary connector

Abstract

The invention relates to the technical field of optical fiber communication, and discloses a high-reliability multi-channel optical fiber rotary connector which comprises a stator shell, a central rotating shaft and a rotor shell, a Dove prism is arranged in an inner cavity of the central rotating shaft, the outer surface of the Dove prism is a cylindrical surface, the cylindrical surface and an inner hole of the central rotating shaft are assembled in a small-gap mode, and the rotor shell is arranged in the inner cavity of the central rotating shaft. The gap is filled with glue with a low expansion coefficient to bond and fix the Dove prism and the central rotating shaft, and the central rotating shaft is made of a ceramic material with a low expansion coefficient; a stepped hole is formed in an inner cavity of the tail sleeve, the stepped hole is encapsulated by glue, and a tail cable penetrates out of the tail sleeve. According to the optical fiber rotary connector, the Dove prism and the collimator bonding plate are made of a low-expansion-coefficient material, and the optical fiber connector is processed in a dynamic sealing and tail sleeve glue potting sealing mode, so that the operation stability of the whole optical fiber rotary connector in a wide-temperature, high-humidity and high-vibration-impact environment can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber communication, in particular to a high-reliability multi-channel optical fiber rotary connector. Background Art

[0002] The fiber optic rotary connector is realized based on the light transmission characteristics of the dove prism. When the dove prism rotates at an angular velocity ω, the image formed by the dove prism rotates at an angular velocity 2ω. Therefore, if the rotation speed ratio of the object and the dove prism is guaranteed to be 2:1, the image formed by the object can be kept stationary. Figure 1 This is a simplified diagram of the structural principle. The optical signal is coupled into the rotatable Dove prism (rotor) through the collimation mechanism at one end, and is coupled to the fixed collimation mechanism (stator) at the other end through prism refraction-reflection-refraction transmission, thus realizing the rotational fixed connection of the optical signal.

[0003] Due to its complex structure, optical path stability is a difficult problem to solve for fiber optic rotary connectors. For example, CN113341504B discloses a multi-channel fiber optic rotary connector that is resistant to harsh environments, in which the prism is matched with the central rotating shaft through a transfer sleeve and bonded with glue. In this prism installation method, due to the limitations of glue and installation gap, the coaxiality of the prism and the central rotating shaft is prone to change when working in a wide temperature change, high humidity and heat, and strong impact and vibration environment, and the optical path stability of the entire fiber optic rotary connector needs to be improved. In addition, its fiber collimator array adopts a U-groove structure to reinforce the fiber collimator, and the U-groove structure will limit the number of product channels. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a highly reliable multi-channel fiber optic rotary connector, which solves the problem that after the prior art fiber optic rotary connector is assembled, the optical path of the entire fiber optic rotary connector is unstable when working in an environment with wide temperature changes, high humidity and heat, and strong impact and vibration.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A high-reliability multi-channel optical fiber rotary connector, comprising a stator housing, a central rotating shaft and a rotor housing, wherein the rotor housing drives the central rotating shaft to rotate along the axis of the stator housing through a transmission bevel gear set, the transmission ratio of the transmission bevel gear set is 2:1, and is characterized in that: a dove prism is arranged in the inner cavity of the central rotating shaft, the outer surface of the dove prism adopts a cylindrical surface, the cylindrical surface is assembled with a small gap between the inner hole of the central rotating shaft, the gap is filled with glue with a low expansion coefficient to bond and fix the dove prism and the central rotating shaft, the central rotating shaft is made of a ceramic material with a low expansion coefficient, and the dove prism is made of a glass material with a low expansion coefficient; a dynamic sealing sleeve is arranged between the rotor housing and the stator housing, and a tail sleeve is arranged at one end of the stator housing and the rotor housing, and a stepped hole is arranged in the inner cavity of the tail sleeve, the stepped hole is sealed with glue, and the tail cable passes through the tail sleeve.

[0009] Preferably, the transmission bevel gear set includes a stator bevel gear sleeve, a rotor bevel gear sleeve and an intermediate bevel gear. The inner cavity of the stator housing is fixedly connected to the stator bevel gear sleeve, and the inner cavity of the rotor housing is fixedly connected to the rotor bevel gear sleeve. The rotor bevel gear sleeve and the stator bevel gear sleeve are driven by a group of intermediate bevel gears to drive the central rotating shaft to rotate along the axial direction. The rotor bevel gear sleeve, the stator bevel gear sleeve and the transmission bevel gear form a planetary gear train, and the transmission bevel gear can rotate on the central rotating shaft.

[0010] Preferably, one end of the stator bevel gear sleeve and the rotor bevel gear sleeve are both fixedly connected with an adhesive plate, and a plurality of optical fiber collimators are adhesively fixed to the adhesive plate.

[0011] Preferably, the optical fiber collimator adopts a low-angle collimator with a deviation angle of less than 0.1 degrees, and the adhesive plate is made of a material with a low expansion coefficient.

[0012] Preferably, a mounting block is fixedly connected to the middle portion of the central rotating shaft, and the intermediate bevel gear is symmetrically and rotationally connected to the mounting block.

[0013] Preferably, the central rotating shaft is rotatably connected to the stator bevel gear sleeve and the rotor bevel gear sleeve via bearings.

[0014] (III) Beneficial effects

[0015] The present invention has the following beneficial effects:

[0016] The highly reliable multi-channel optical fiber rotary connector adopts a cylindrical surface through a dove prism, and the cylindrical surface is assembled with a small gap between the diameter of the central rotating shaft, and the gap is filled with glue with a low expansion coefficient for bonding. The central rotating shaft adopts a ceramic material with a low expansion coefficient. The dove prism adopts a glass material with a low expansion coefficient. This installation structure can ensure the stability of the installation of the optical fiber rotary connector's heavy central rotating shaft, dove prism and auxiliary installation structure under wide temperature changes, high humidity and heat, and strong impact and vibration, thereby improving the stability of the optical path transmission during the entire optical fiber communication process. The optical fiber rotary connector is sealed with glue at the pigtail cable connection and the stator housing and the rotor housing are dynamically sealed to ensure the moisture and heat resistance of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the AA-direction cross-section structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of the middle A area;

[0020] Figure 4 It is a schematic diagram of the layout structure of the transmission bevel gear set of the present invention;

[0021] Figure 5 It is a schematic diagram of the layout structure of the Dove prism and the central rotation axis of the present invention.

[0022] In the figure: 1. stator housing; 2. adhesive plate; 3. optical fiber collimator; 4. tail sleeve; 41. stepped hole; 5. central rotating shaft; 6. dove prism; 7. transmission bevel gear set; 71. stator bevel gear sleeve; 72. rotor bevel gear sleeve; 73. intermediate bevel gear; 8. rotor housing; 9. dynamic sealing sleeve; 10. mounting block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1The present invention provides a technical solution: a high-reliability multi-channel optical fiber rotary connector, comprising a stator housing 1, a central rotating shaft 5 and a rotor housing 8. The rotor housing 8 drives the central rotating shaft 5 to rotate along the axis of the stator housing 1 through a transmission bevel gear set 7. The transmission ratio of the transmission bevel gear set 7 is 2:1. A dove prism 6 is arranged in the inner cavity of the central rotating shaft 5. The outer surface of the dove prism 6 adopts a cylindrical surface. The cylindrical surface and the inner hole of the central rotating shaft 5 are assembled with a small gap. The gap is filled with glue with a low expansion coefficient to bond and fix the dove prism 6 and the central rotating shaft 5. The central rotating shaft 5 is made of a ceramic material with a low expansion coefficient, and the dove prism 6 is made of a glass material with a low expansion coefficient. A dynamic sealing sleeve 9 is arranged between the rotor housing 8 and the stator housing 1. A tail sleeve 4 is arranged at one end of the stator housing 1 and the rotor housing 8. A stepped hole 41 is arranged in the inner cavity of the tail sleeve 4. The stepped hole 41 is sealed with glue, and the tail cable passes through the tail sleeve 4.

[0025] The present invention adopts a cylindrical surface for the dove prism 6, and the cylindrical surface is assembled with a small gap between the diameters of the central rotating shaft 5, and the gap is filled with glue with a low expansion coefficient for bonding. The central rotating shaft 5 adopts a ceramic material with a low expansion coefficient. The dove prism 6 adopts a glass material with a low expansion coefficient. By directly gluing the central rotating shaft to the dove prism, and both adopt low expansion materials for coordination, the stability of the installation of the central rotating shaft 5, the dove prism 6 and the auxiliary mounting structure of the optical fiber rotary connector can be ensured under wide temperature changes, high humidity and heat, and strong impact and vibration, and the coaxiality is not easily affected, thereby improving the stability of the optical path transmission during the entire optical fiber communication process. By using glue potting at the tail cable connection of the optical fiber rotary connector and dynamic sealing between the stator housing 1 and the rotor housing 8, the moisture and heat resistance of the entire device is guaranteed.

[0026] In this embodiment, the transmission bevel gear set 7 includes a stator bevel gear sleeve 71, a rotor bevel gear sleeve 72 and an intermediate bevel gear 73. The inner cavity of the stator housing 1 is fixedly connected with the stator bevel gear sleeve 71, and the inner cavity of the rotor housing 8 is fixedly connected with the rotor bevel gear sleeve 72. The rotor bevel gear sleeve 72 and the stator bevel gear sleeve 71 drive the central rotating shaft 5 to rotate along the axis direction through a group of intermediate bevel gears 73. The rotor bevel gear sleeve 72, the stator bevel gear sleeve 71 and the transmission bevel gear form a planetary gear system, and the transmission bevel gear can rotate on the central rotating shaft 5. Referring to Figures 4 and 5, the entire transmission bevel gear set adopts a double-gear closed transmission structure, so that when the rotor part is transmitted through a pair of intermediate bevel gears, it effectively ensures that the transmission of the central rotating shaft is smooth and stable, which can improve the stability of the operation of the entire product.

[0027] In this embodiment, one end of the stator bevel gear sleeve 71 and the rotor bevel gear sleeve 72 are both fixedly connected with an adhesive plate 2 , and a plurality of optical fiber collimators 3 are adhesively fixed to the adhesive plate 2 .

[0028] Reference Figure 2 and 4 As shown, in this embodiment, the optical fiber collimator 3 adopts a low-angle collimator of less than 0.1 degrees, and the adhesive plate 2 is made of a material with a low expansion coefficient. By adopting a low-angle collimator of less than 0.1 degrees, the gap between the optical fiber collimator 3 and the inner hole of the adhesive plate 2 is small; the adhesive plate 2 is made of a material with a low expansion coefficient such as ceramic or glass. This measure can ensure the high reliability of the product. At the same time, under the limited size of the stator and rotor housing 8, it is convenient to arrange more optical fiber collimators 3 to form multi-path optical transmission, which meets various transmission requirements.

[0029] Reference Figure 3 As shown, in this embodiment, the middle of the central rotating shaft 5 is fixedly connected with a mounting block 10, and the intermediate bevel gear 73 is symmetrically and rotationally connected to the mounting block 10. By using two pairs of bevel gears in the transmission bevel gear set 7, the stability of the operation of the rotor part and the stator part can be improved.

[0030] In this embodiment, the central rotating shaft 5 is rotatably connected to the stator bevel gear sleeve 71 and the rotor bevel gear sleeve 72 via bearings.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-reliability multi-channel optical fiber rotary connector, comprising a stator housing, a central rotating shaft and a rotor housing, wherein the rotor housing drives the central rotating shaft to rotate along the axis of the stator housing through a transmission bevel gear set, and the transmission ratio of the transmission bevel gear set is 2:1, characterized in that: The inner cavity of the central rotating shaft is provided with a Dove prism, the outer surface of the Dove prism adopts a cylindrical surface, the cylindrical surface is assembled with a small gap with the inner hole of the central rotating shaft, the gap is filled with glue with a low expansion coefficient to bond and fix the Dove prism and the central rotating shaft, the central rotating shaft is made of a ceramic material with a low expansion coefficient, and the Dove prism is made of a glass material with a low expansion coefficient; a dynamic sealing sleeve is arranged between the rotor housing and the stator housing, one end of the stator housing and the rotor housing is provided with a tail sleeve, the inner cavity of the tail sleeve is arranged with a stepped hole, the stepped hole is sealed with glue, and the tail cable passes through the tail sleeve.

2. A high-reliability multi-channel optical fiber rotary connector according to claim 1, characterized in that: The transmission bevel gear set includes a stator bevel gear sleeve, a rotor bevel gear sleeve and an intermediate bevel gear. The inner cavity of the stator housing is fixedly connected to the stator bevel gear sleeve, and the inner cavity of the rotor housing is fixedly connected to the rotor bevel gear sleeve. The rotor bevel gear sleeve and the stator bevel gear sleeve are driven by a group of intermediate bevel gears to drive the central rotating shaft to rotate along the axial direction. The rotor bevel gear sleeve, the stator bevel gear sleeve and the transmission bevel gear form a planetary gear system, and the transmission bevel gear can rotate on the central rotating shaft.

3. A high-reliability multi-channel optical fiber rotary connector according to claim 2, characterized in that: One end of the stator bevel gear sleeve and the rotor bevel gear sleeve are both fixedly connected with an adhesive plate, and a plurality of optical fiber collimators are adhesively fixed to the adhesive plate.

4. A high-reliability multi-channel optical fiber rotary connector according to claim 3, characterized in that: The optical fiber collimator adopts a low deflection angle collimator of less than 0.1 degrees, and the bonding plate is made of a material with a low expansion coefficient.

5. A high-reliability multi-channel optical fiber rotary connector according to claim 4, characterized in that: A mounting block is fixedly connected to the middle of the central rotating shaft, and the intermediate bevel gear is symmetrically and rotationally connected to the mounting block.

6. A high-reliability multi-channel optical fiber rotary connector according to claim 5, characterized in that: The central rotating shaft is rotatably connected to the stator bevel gear sleeve and the rotor bevel gear sleeve via bearings.

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