High-reliability multi-channel optical fiber rotary connector

Abstract

The utility model relates to the technical field of optical fiber communication, and discloses a high-reliability multichannel 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, and 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, the gap is filled with glue with a low expansion coefficient to adhere 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 utility model, the Dove prism and the collimator bonding plate which are made of low expansion coefficient materials are adopted, and the optical fiber connector is processed by adopting a dynamic seal and tail sleeve glue potting sealing mode, so that the operation stability of the whole optical fiber rotary connector under the environment of wide temperature, high humidity and high vibration impact can be realized.

Description

Technical Field

[0001] The utility model 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 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 rotational speed ratio of the object and the dove prism is maintained at 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 refraction-reflection-refraction transmission of the prism, 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. Its prism is matched with the central rotating shaft through a transition sleeve and bonded with glue. Under 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 an environment with wide temperature changes, high humidity and heat, and strong shock and vibration. 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. The U-groove structure will limit the number of product channels. Utility Model Content

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the utility model provides a highly reliable multi-channel fiber optic rotary connector, which solves the problem that after the existing 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] (2) Technical solution

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

[0008] A high-reliability multi-channel fiber optic 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: a dove prism is provided in the inner cavity of the central rotating shaft, the outer surface of the dove prism adopts a cylindrical surface, and the cylindrical surface is assembled with a small gap between the inner hole of the central rotating shaft, and the gap is filled with low-expansion coefficient glue to bond and fix the dove prism and the central rotating shaft, the central rotating shaft is made of a low-expansion coefficient ceramic material, and the dove prism is made of a low-expansion coefficient glass material; a dynamic sealing sleeve is arranged between the rotor housing and the stator housing, and a tail sleeve is provided 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 constitute 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 to 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 rotationally connected to the stator bevel gear sleeve and the rotor bevel gear sleeve via bearings.

[0014] (3) Beneficial effects

[0015] The utility model has the following beneficial effects:

[0016] This highly reliable, multi-channel fiber optic rotary connector utilizes a cylindrical surface through a dove prism, which is assembled with a small gap between the cylindrical surface and the central rotating shaft. The gap is bonded with low-expansion glue. The central rotating shaft is constructed of low-expansion ceramic. The dove prism is constructed of low-expansion glass. This mounting structure ensures the stability of the fiber optic rotary connector's central rotating shaft, dove prism, and auxiliary mounting structure under wide temperature fluctuations, high humidity and heat, and strong shock and vibration, thereby enhancing the stability of the optical path transmission during the entire fiber optic communication process. The fiber optic rotary connector's resistance to humidity and heat is ensured by glue potting at the pigtail cable connection and dynamic sealing between the stator and rotor housings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a left-side structural diagram of the present utility model;

[0019] Figure 3 This is a schematic diagram of the AA-direction cross-section structure of the present invention;

[0020] Figure 4 For this utility model Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0021] Figure 5 This is a schematic diagram of the layout structure of the transmission bevel gear set of the utility model;

[0022] Figure 6 This is a schematic diagram of the layout structure of the Dove prism and the central rotation axis of the utility model.

[0023] In the figure: 1. Stator housing; 2. Adhesive plate; 3. 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 seal sleeve; 10. Mounting block. DETAILED DESCRIPTION

[0024] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1The utility model 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 provided 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 is assembled with a small gap between the inner hole of the central rotating shaft 5. 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, and a tail sleeve 4 is provided at one end of the stator housing 1 and the rotor housing 8. The inner cavity of the tail sleeve 4 is arranged with a stepped hole 41. The stepped hole 41 is sealed with glue, and the tail cable is arranged through the tail sleeve 4.

[0026] In the present invention, the Dove prism 6 adopts a cylindrical surface, and the cylindrical surface is assembled with a small diameter gap between the cylindrical surface and the central rotating shaft 5, and the gap is filled with low expansion coefficient glue 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 adopting low expansion materials to cooperate with each other, the stability of the installation of the optical fiber rotary connector center rotating shaft 5, Dove prism 6 and auxiliary mounting structure can be guaranteed under wide temperature changes, high humidity and heat, and strong impact and vibration. 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.

[0027] 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 stator bevel gear sleeve 71 is fixedly connected to the inner cavity of the stator housing 1, and the rotor bevel gear sleeve 72 is fixedly connected to the inner cavity of the rotor housing 8. The rotor bevel gear sleeve 72 and the stator bevel gear sleeve 71 drive the central rotating shaft 5 to rotate along the axial direction through a set of intermediate bevel gears 73. The rotor bevel gear sleeve 72, the stator bevel gear sleeve 71, and the transmission bevel gears form a planetary gear train, and the transmission bevel gears 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 portion is driven by a pair of intermediate bevel gears, the transmission of the central rotating shaft is effectively guaranteed to be smooth and stable, which can improve the stability of the operation of the entire product.

[0028] In this embodiment, one end of the stator bevel gear sleeve 71 and the rotor bevel gear sleeve 72 are both fixedly connected to an adhesive plate 2 , and a plurality of optical fiber collimators 3 are adhesively fixed to the adhesive plate 2 .

[0029] Reference Figure 2 and 4 As shown, in this embodiment, the fiber collimator 3 utilizes a low-angle collimator with a deviation of less than 0.1 degrees, and the adhesive plate 2 is made of a low-thermal expansion material. By using a low-angle collimator with a deviation of less than 0.1 degrees, the gap between the fiber collimator 3 and the inner hole of the adhesive plate 2 is small. The adhesive plate 2 is made of a low-thermal expansion material such as ceramic or glass. This ensures high product reliability. Furthermore, within the limited dimensions of the stator and rotor housings 8, more fiber collimators 3 can be easily arranged to form multiple optical transmission paths, meeting various transmission requirements.

[0030] Reference Figure 3 As shown, in this embodiment, the middle portion of the central rotating shaft 5 is fixedly connected to 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 and stator parts can be improved.

[0031] 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.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highly reliable multi-channel fiber optic rotary connector comprising a stator housing, a central rotating shaft, and a rotor housing. The rotor housing drives the central rotating shaft to rotate along the axis of the stator housing via a bevel gear set. The bevel gear set has a transmission ratio of 2:1 and is characterized by: 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, and the cylindrical surface is assembled with a small gap in 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 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. The 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 constitute a planetary gear train, and the transmission bevel gear can rotate on the central rotating shaft.

3. The 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 on the adhesive plate.

4. The 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. The 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. The 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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