High temperature resistant non-contact expanded beam fiber optic connector

Abstract

The present invention relates to the technical field of optical fiber connectors, and more specifically to a high temperature resistant non-contact beam expanding optical fiber connector, including a socket and a plug, wherein a first neutral beam expanding optical contact is provided in the socket, and a second neutral beam expanding optical contact is provided in the plug, and when the socket and the plug are docked with each other, the first neutral beam expanding optical contact and the second neutral beam expanding optical contact are non-contact coupled. The present application designs the plug housing and the socket housing into an integrated structure, and mechanical fixation is achieved between the plug housing and the socket housing through a limiting structure, and mechanical fixation is also adopted between the contact housing and the socket housing, and between the encapsulation housing and the plug housing. By optimizing the structure of the beam expanding optical fiber connector of the present invention, the use of a bonding process is avoided, so as to achieve the effect of improving the high temperature resistance level and reliability of the connector, and improving the vibration resistance and impact resistance of the beam expanding optical fiber connector.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber connectors, and in particular to a high-temperature resistant non-contact beam-expanding optical fiber connector. Background Art

[0002] With the increasing complexity of aircraft functions, increasing payload, increasing flight speed, and the application of integrated electronic and information technology, the requirements for equipment optical fiber communication networks are becoming increasingly stringent. The heat generated by friction when aircraft fly at high speeds is extremely high, and the requirements for the high temperature resistance of various components in the flight system are constantly increasing. At present, on high-speed flying drones and other high-speed aircraft, strict requirements are placed on optical signal transmission in high temperature environments, and the requirement for environmental temperature resistance reaches above 300°C.

[0003] In order to meet the requirement of high temperature resistance, high temperature resistant materials or high temperature resistant coatings are generally used in the prior art, such as connectors using polyimide as the temperature resistant coating. For example, in the design proposed in the Chinese patent application with publication number CN109358397A, the ferrule assembly uses a ceramic ferrule and a high temperature resistant optical fiber. The high temperature resistant optical fiber has a polyimide coating layer and can withstand temperatures above 270° C. The prior art also develops an optical fiber connector structure using a high temperature resistant alloy as the shell and a high temperature resistant ceramic as the ferrule.

[0004] However, the above-mentioned optical fiber connectors all require the use of glue during assembly, and the glue bonding process will face problems such as insufficient temperature resistance, mismatched thermal expansion coefficients, and insufficient chemical stability at high temperatures. It can be seen that this high-temperature unreliability is difficult to adapt to the use requirements of high-environment resistance above 300°C. Summary of the invention

[0005] In view of the technical problems existing in the optical fiber connector in the prior art, the first aspect of the present invention provides a high temperature resistant non-contact beam expanding optical fiber connector, comprising a socket and a plug, wherein a first neutral beam expanding optical contact is provided in the socket, and a second neutral beam expanding optical contact is provided in the plug, and when the socket and the plug are connected to each other, the first neutral beam expanding optical contact and the second neutral beam expanding optical contact are non-contact coupled;

[0006] The socket comprises a socket housing, a contact housing and a socket wire seal, wherein the contact housing and the socket wire seal are respectively mounted on the head and the tail of the socket housing, and the contact housing, the socket housing and the socket wire seal jointly form a first cavity for accommodating the first neutral beam expansion optical contact;

[0007] The plug comprises a plug housing, a nut, a packaging housing and a plug wire seal, wherein the packaging housing and the plug wire seal are respectively mounted on the head and the tail of the plug housing, the nut is mounted on the outer wall of the plug housing from the tail direction, and the movement of the nut along the axial direction of the plug housing is limited by an elastic limiting structure, and the plug housing, the packaging housing and the plug wire seal jointly form a second cavity for accommodating the second neutral beam expansion optical contact;

[0008] The socket wire seal body and the plug wire seal body are constructed to have a step structure, the socket wire seal body is fixed to the tail of the socket housing through a first limiting structure, the first limiting structure is in contact with the step structure, and the plug wire seal body is fixed to the tail of the plug housing through a second limiting structure, the second limiting structure is in contact with the step structure;

[0009] The contact housing is fixed to the socket housing through a threaded connection, and the encapsulation housing is fixed to the plug housing through a threaded connection.

[0010] Preferably, the socket wire seal body and the plug wire seal body both include a first cylinder and a second cylinder, the diameter of the second cylinder is smaller than the diameter of the first cylinder, and a step surface is formed between the first cylinder and the second cylinder, and the step surface faces outward.

[0011] Preferably, the first limiting structure and the second limiting structure both include a retaining ring and a snap ring, the outer wall of the snap ring is provided with a protruding structure, the tail ends of the socket shell and the plug shell are both provided with an annular groove, a positioning hole is provided in the annular groove, the retaining ring is assembled to the step surface, the snap ring is snapped into the annular groove, the protruding structure is engaged with the positioning hole, and the retaining ring is axially limited.

[0012] Preferably, a positioning column is provided on the end face of the first cylinder, and corresponding positioning grooves are provided at the tail ends of the socket shell and the plug shell. The positioning column can be inserted into the positioning groove to circumferentially position the socket wire seal body and the socket shell, and to circumferentially position the plug shell and the plug wire seal body.

[0013] Preferably, the plug shell is constructed to have a first socket at the head, the packaging shell is installed in the first socket, the packaging shell includes a first shell and a second shell, the first shell and the second shell are fixed by a first connecting piece, the first connecting piece has an exposed part, the end face of the first socket is provided with a blind hole for accommodating the first connecting piece, the end face is also provided with a screw hole, the first shell and the second shell are connected together to the second connecting piece in the screw hole and fixed to one side of the end face, and the packaging shell is provided with an area for coupling the first neutral beam expanding optical contact and the second neutral beam expanding optical contact.

[0014] Preferably, the outer wall of the plug housing is provided with an outer convex ring, a positioning key and a retaining ring groove in sequence from the head to the tail, the outer diameter of the outer convex ring is larger than the outer diameter of other parts of the packaging housing, and the inner wall of the nut is provided with an inner convex ring, the inner diameter of the inner convex ring is smaller than the inner diameter of other parts;

[0015] The nut is installed on the outer wall of the plug housing from the tail to the head of the plug housing, and the inner convex ring is fitted with the outer convex ring. The first side of the inner convex ring forms a step positioning surface, and the second side forms a receiving groove. The elastic limiting structure is located in the receiving groove.

[0016] Preferably, the elastic limiting structure includes a corrugated spring, a dynamic clamping ring, a static clamping ring and a retaining spring which are sequentially loaded into the accommodating groove from the rear end of the plug shell, the retaining spring is clamped into the retaining spring groove to make the dynamic clamping ring and the static clamping ring tightly attached, the dynamic clamping ring is circumferentially fixed to the nut, the static clamping ring is circumferentially fixed to the plug shell, and the fitting surfaces of the dynamic clamping ring and the static clamping ring are provided with retaining teeth, so that the nut is only allowed to rotate in one direction around the plug shell.

[0017] Preferably, the head of the socket shell is provided with a second hole, the second hole is provided with a sealing gasket, the outer wall of the head of the socket shell is provided with an external thread, and the inner wall of the nut is provided with an internal thread. When the nut and the socket shell are tightened, the head of the socket shell fits with the end face of the outer convex ring, and the head of the plug shell fits with the sealing gasket.

[0018] Preferably, the socket wire seal and the plug wire seal are made of high temperature resistant silicone rubber material.

[0019] Preferably, the dynamic clamp ring and the static clamp ring are made of titanium alloy, and the surfaces of the dynamic clamp ring and the static clamp ring are provided with a wear-resistant coating.

[0020] Compared with the prior art, the high temperature resistant non-contact expanded beam optical fiber connector of the present invention has the following significant advantages:

[0021] The high temperature resistant non-contact beam expanding optical fiber connector of the embodiment of the present invention designs the plug housing and the socket housing into an integrated structure, and realizes mechanical fixation with the wire seal body through the limit structure, and also mechanically fixes the contact housing and the socket housing, and the packaging housing and the plug housing. Through this structural optimization, the use of bonding process can be avoided, and the high temperature resistance level and reliability of the connector can be improved, which is beneficial to improving the vibration resistance and impact resistance of the connector. At the same time, the neutral beam expanding optical contact adopts a self-focusing lens to collimate the light beam, regardless of the pin and the socket, and has strong compatibility, which is beneficial to reducing the manufacturing cost of the connector. The connector as a whole can realize stable transmission of optical signals in a high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in each figure may be represented by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic structural diagram of a high temperature resistant non-contact expanded beam optical fiber connector shown in the present invention.

[0024] Figure 2 It is a structural schematic diagram of the packaging housing shown in the present invention being installed in the plug housing.

[0025] Figure 3 It is a schematic diagram of the assembly of the plug housing and the nut shown in the present invention.

[0026] Figure 4 It is a schematic diagram of the elastic limiting structure shown in the present invention being assembled into the accommodating groove.

[0027] Figure 5 yes Figure 4 Stereoscopic diagram.

[0028] Figure 6 It is a structural schematic diagram of the plug wire seal body shown in the present invention.

[0029] Figure 7 It is a side view of the plug wire seal body shown in the present invention.

[0030] Figure 8 It is a schematic diagram of the structure of the socket shown in the present invention.

[0031] Fig. 9 It is a schematic structural diagram of the first neutral beam expanding optical contact shown in the present invention. DETAILED DESCRIPTION

[0032] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0033] Combination Figure 1 As shown, the first aspect of the present invention proposes a high temperature resistant non-contact beam expanding optical fiber connector, comprising a socket 100 and a plug 200 , wherein a first neutral beam expanding optical contact 300 is disposed in the socket 100 , and a second neutral beam expanding optical contact 400 is disposed in the plug 200 .

[0034] When the socket 100 and the plug 200 are mated with each other, the first neutral beam expansion optical contact 300 and the second neutral beam expansion optical contact 400 are non-contact coupled.

[0035] Compared with the direct docking coupling method, the non-coupled docking is beneficial to improving the mechanical properties of the connector such as resistance to vibration and impact, and will not cause the optical transmission performance to decline due to friction and dirt on the optical fiber end face.

[0036] Combination Figure 1 As shown, the socket 100 includes a socket housing 110 , a contact housing 120 and a socket wire seal 140 , and the contact housing 120 and the socket wire seal 140 are respectively mounted to the head and the tail of the socket housing 110 .

[0037] Furthermore, the plug 200 includes a plug housing 210 , a nut 220 , a packaging housing 230 , and a plug wire seal 240 . The packaging housing 230 and the plug wire seal 240 are respectively mounted to the head and the tail of the plug housing 210 .

[0038] Furthermore, the nut 220 is installed to the outer wall of the plug housing 210 from the rear direction, and the movement of the nut 220 along the axial direction of the plug housing 210 is limited by the elastic limiting structure 20 .

[0039] In this way, when the plug housing 210 is inserted into the socket housing 110, the nut 220 is used to lock it, so that the plug 200 and the socket 100 can be reliably connected. No glue is used between the nut 220 and the plug housing 210, which also ensures the connection reliability in a high temperature environment.

[0040] like Figure 1 As shown in FIG. 1 , the head of the socket housing 110 faces one side of the plug 200, and the tail of the socket housing 110 faces one side away from the plug 200. Figure 1 As shown, the head of the plug housing 210 faces one side of the socket housing 110 , and the tail of the plug housing 210 faces one side away from the socket housing 110 .

[0041] The socket housing 110 and the plug housing 210 are designed as an integrated structure, which can avoid the traditional gluing process, achieve better mechanical stability, and improve the mechanical properties of the connector such as resistance to vibration and impact.

[0042] Combination Figure 1 and Figure 2 As shown, along the insertion direction of the plug housing 210 into the socket housing 110, the plug housing 210 is divided into a head, a middle and a tail, wherein the head is used for connecting the socket housing 110. As mentioned above, the contact housing 120 and the socket wire seal 140 are respectively installed to the head and tail of the socket housing 110.

[0043] Combination Figure 2 , 3As shown, a first plug hole 211 is provided at the head of the plug housing 210 , and the encapsulation housing 230 of the plug 200 is installed in the first plug hole 211 .

[0044] The encapsulation shell 230 of the plug 200 includes a first shell 231 and a second shell 232 , which are fixed by a first connecting member 233 , the second shell 232 faces the inner side of the first jack 211 , and the first shell 231 faces the outer side of the first jack 211 .

[0045] The first connecting member 233 may be a screw, which penetrates the second shell 232 from one side of the second shell 232 and is connected to the first shell 231 , so that the first shell 231 and the second shell 232 are connected together.

[0046] Furthermore, the first connecting member 233 has an exposed portion, and a blind hole 219 for accommodating the first connecting member 233 is provided on the end face 218 of the first socket 211. In this way, the exposed portion of the first connecting member 233 (for example, the end cap of a screw) can be inserted into the blind hole 219, thereby achieving compact assembly and circumferential positioning of the packaging shell 230.

[0047] Furthermore, the end face 218 is also provided with a screw hole 215. When the packaging shell 230 is attached to the end face 218 and the first connecting piece 233 is inserted into the blind hole 219, the second connecting piece 234 is used to pass through the screw hole 215. The first shell 231 and the second shell 232 are connected together to the second connecting piece 234 in the screw hole 215 and fixed to one side of the end face 218, thereby realizing the fixation of the packaging shell 230.

[0048] The packaging shell 230 is provided with an area for coupling the first neutral beam expanding optical contact 300 and the second neutral beam expanding optical contact 400 . When the packaging shell 230 is fixed, the area is connected to the cavity in the middle of the plug shell 210 to accommodate the second neutral beam expanding optical contact 400 .

[0049] Further, combined with Figure 2 As shown, the outer wall of the plug housing 210 (especially the middle part of the outer wall) is provided with an outer convex ring 212, a positioning key 213 and a retaining ring groove 214 in sequence from the head to the tail, and the outer diameter of the outer convex ring 212 is larger than the outer diameter of other parts of the packaging housing 230. Figure 3 As shown, the inner wall of the nut 220 is provided with an inner convex ring 222, and the inner diameter of the inner convex ring 222 is smaller than the inner diameter of other parts.

[0050] So, combined Figure 2 , Figure 3As shown, when the nut 220 is installed to the outer wall of the plug housing 210 from the tail to the head direction of the plug housing 210, the inner convex ring 222 can fit with the outer convex ring 212 to achieve axial limitation of the two. The outer convex ring 212 can prevent the nut 220 from moving toward the head direction of the plug housing 210.

[0051] Furthermore, a step positioning surface 223 is formed on a first side of the inner convex ring 222 , and a receiving groove 224 is formed on a second side, and the elastic limiting structure 20 is located in the receiving groove 224 .

[0052] In this way, the positioning key 213 and the retaining ring groove 214 on the outer wall of the plug housing 210 can limit the elastic limiting structure 20, and the elastic limiting structure 20 further limits the nut 220, so that the nut 220 is fixed at a predetermined axial position on the surface of the plug housing 210 and can only rotate relative to the plug housing 210.

[0053] Combination Figure 4 As shown, the elastic limiting structure 20 includes a corrugated spring 21 , a dynamic clamping ring 22 , a static clamping ring 23 and a clamping spring 24 which are sequentially loaded into the receiving groove 224 from the rear end of the plug housing 210 .

[0054] The corrugated spring 21 has axial elasticity. When the static clamping ring 23 presses the dynamic clamping ring 22 in the direction of being inserted into the receiving groove 224, the corrugated spring 21 is deformed and applies opposite pressure to the static clamping ring 23 to keep the dynamic clamping ring 22 and the static clamping ring 23 in close contact with each other.

[0055] During assembly, the retaining ring 24 is inserted into the retaining ring groove 214, so that the dynamic retaining ring 22 and the static retaining ring 23 are tightly attached, the dynamic retaining ring 22 and the nut 220 are circumferentially fixed, and the static retaining ring 23 and the plug housing 210 are circumferentially fixed. The fitting surfaces of the dynamic retaining ring 22 and the static retaining ring 23 are provided with retaining teeth, so that the nut 220 is only allowed to rotate in one direction around the plug housing 210.

[0056] Specific, combined Figure 5 As shown, the movable clamping ring 22 is provided with a first tooth surface 22b on the side facing the static clamping ring 23, and the outer wall of the movable clamping ring 22 is provided with a protrusion 22a, which engages with the axial groove in the accommodating groove 224 to limit the rotation of the movable clamping ring 22 around its axis, so that the movable clamping ring 22 and the nut 220 are circumferentially fixed.

[0057] Combination Figure 5 As shown, the static clamp ring 23 is provided with a second tooth surface 23b on the side facing the dynamic clamp ring 22, and the inner wall of the static clamp ring 23 is provided with a recess 23a, which cooperates with the positioning key 213 on the outer wall of the plug housing 210 to achieve circumferential fixation of the static clamp ring 23 and the plug housing 210.

[0058] The first tooth surface 22b and the second tooth surface 23b are configured to allow sliding relative to each other in only one direction and to be locked in the opposite direction.

[0059] Optionally, tooth structures with different "slopes" are designed at the contact surfaces of the dynamic and static clamp rings, wherein the dynamic clamp ring 22 is designed as a full-tooth structure on the interface, and the static clamp ring 23 is designed as a 1 / 2 tooth structure on the interface. The surface roughness of the dynamic and static clamp rings is controlled so that the connector plug 200 and the socket 100 can be smoothly screwed when mated. This design makes the connector's screw-out force greater than its screw-in force, and it has a self-locking function.

[0060] Therefore, when the nut 220 rotates forward, the dynamic clamp ring 22 rotates accordingly, and the tooth surfaces between the dynamic clamp ring 22 and the static clamp ring 23 slide and rub against each other, and the contact pressure is maintained by the corrugated spring 21. When the nut 220 rotates reversely, the tooth surfaces between the dynamic clamp ring 22 and the static clamp ring 23 engage with each other and cannot rotate. The engagement and separation torque requirements of the connector can be met, thereby effectively preventing the connector plug 200 and the socket 100 from being loosened in a high vibration environment, and realizing the anti-loosening of the connector.

[0061] Preferably, the dynamic clamp ring 22 and the static clamp ring 23 are made of titanium alloy, and the surfaces of the dynamic clamp ring 22 and the static clamp ring 23 are provided with a wear-resistant coating.

[0062] In this way, the dynamic clamp ring 22 and the static clamp ring 23 can effectively resist wear and tear, and extend the service life of the plated parts. At the same time, they have a low friction coefficient, making the moving parts smoother, and have excellent chemical stability and strong resistance to chemical substances such as acids and alkalis.

[0063] Combination Figure 1 As shown, further, in order to facilitate the mechanical assembly of the wire seal, the socket wire seal 140 and the plug wire seal 240 are both designed with a step structure. The socket wire seal 140 is fixed to the tail of the socket housing 110 by a first limiting structure 10a, and the first limiting structure 10a fits with the step structure of the socket wire seal 140. The plug wire seal 240 is fixed to the tail of the plug housing 210 by a second limiting structure 10b, and the second limiting structure 10b fits with the step structure of the plug wire seal 240.

[0064] In this way, the socket wire seal 140 and the socket shell 110 can be mechanically fixed, and the plug wire seal 240 and the plug shell 210 can be mechanically fixed. Compared with the traditional bonding process, the mechanical fixation has high mechanical stability and good high temperature resistance, and can withstand a high temperature environment of 300°C.

[0065] Combination Figure 5 and Figure 6As shown, in an optional embodiment, the socket wire seal body 140 and the plug wire seal body 240 both include a first cylinder 241 and a second cylinder 242, the diameter of the second cylinder 242 is smaller than the diameter of the first cylinder 241, and a step surface 243 is formed between the first cylinder 241 and the second cylinder 242, and the step surface 243 faces outward.

[0066] In this way, the step surface 243 can be limited by the limiting structure, and the wire sealing body can be fixed to a predetermined position.

[0067] In an optional embodiment, the first limiting structure 10a and the second limiting structure 10b both include a retaining ring 11 and a clamping ring 12, and the outer wall of the clamping ring 12 is provided with a protruding structure.

[0068] Combination Figure 2 As shown, the tails of the socket housing 110 and the plug housing 210 are both provided with an annular groove 216 , and a positioning hole 217 is provided in the annular groove 216 .

[0069] During assembly, the retaining ring 11 is assembled to the step surface 243, the retaining ring 12 is inserted into the annular groove 216, and the protruding structure is engaged with the positioning hole 217 to axially limit the retaining ring 11. At this time, the wire seal body can be in a predetermined position and cannot move, thereby achieving axial positioning. This mechanical fixing method is more reliable in high temperature environments.

[0070] When the wire seal body needs to be disassembled, a tool is used to reach into the positioning hole 217 to lift the clamping ring 12 out of the annular clamping groove 216. At this time, the retaining ring 11 can be freely taken out and the wire seal body can be pulled out.

[0071] Combination Figure 6 and Figure 7 As shown, the end surface of the first cylinder 241 is provided with a positioning column 244, optionally, as Figure 6 The end surface of the first cylindrical body 241 is provided with two positioning posts 244 , and the tails of the socket housing 110 and the plug housing 210 are provided with corresponding positioning grooves.

[0072] In this way, when the positioning column 244 can be inserted into the positioning groove, the socket wire seal 140 and the socket housing 110 are circumferentially positioned, and the plug housing 210 and the plug wire seal 240 are circumferentially positioned.

[0073] Furthermore, a sealing hole 245 is provided in the socket wire seal 140 and the plug wire seal 240 for inserting the optical fiber.

[0074] Preferably, the socket wire seal 140 and the plug wire seal 240 are made of high temperature resistant silicone rubber material. The high temperature resistant silicone rubber polymer molecules are chain structures connected by silicon-carbon bonds, and their primary components are high molar mass linear polysiloxane. Because of its small intermolecular effect force, the molecules are helical in structure, and the methyl groups are placed outward and can rotate freely, the high temperature silicone rubber has very good heat resistance.

[0075] Combination Figure 8 As shown, the head of the socket housing 110 is provided with a second plug hole 111 , a sealing gasket 130 is arranged in the second plug hole 111 , an outer wall of the head of the socket housing 110 is provided with an outer thread 112 , and an inner wall of the nut 220 is provided with an inner thread 221 .

[0076] A square rubber pad 113 is provided on the mounting end surface of the socket housing 110 and the device, and the square rubber pad 113 is also made of high temperature resistant silicone rubber material.

[0077] Thus, when the nut 220 is tightened with the socket housing 110 , the head of the socket housing 110 fits with the end surface of the outer convex ring 212 , and the head of the plug housing 210 fits with the sealing gasket 130 , thereby achieving a good sealing effect.

[0078] Preferably, the sealing gasket 130 is made of high temperature resistant silicone rubber material.

[0079] Further, the contact housing 120 is fixed to the socket housing 110 by a threaded connector, and the package housing 230 is fixed to the plug housing 210 by a threaded connector. Specifically, the contact housing 120 is connected to the socket housing 110 in the same manner as the package housing 230 is connected to the plug housing 210, both of which are fixed using screws.

[0080] In this way, the contact housing 120 is also connected to the socket housing 110 by mechanical fixing, and the package housing 230 is also connected to the plug housing 210 by mechanical fixing, so as to achieve stability in a high temperature environment.

[0081] Combination Figure 1 As shown, only the contact shell 120, the socket shell 110 and the socket wire seal 140 together form the first cavity 101 for accommodating the first neutral beam expansion optical contact 300, and no glue is used to bond the contact shell 120, the socket shell 110 and the socket wire seal 140, which is conducive to achieving tolerance to a high temperature environment of 300°C, especially maintaining the integrity of the first cavity 101 under a high temperature and vibration environment.

[0082] Combination Figure 1As shown, the second cavity 201 for accommodating the second neutral beam expanding optical contact 400 is formed only by the plug shell 210, the packaging shell 230 and the plug wire seal 240. No glue is used to bond the plug shell 210, the packaging shell 230 and the plug wire seal 240, which is conducive to achieving tolerance to a high temperature environment of 300°C, especially maintaining the integrity of the second cavity 201 under a high temperature and vibration environment.

[0083] Combination Fig. 9 As shown, the first neutral beam expansion optical contact 300 and the second neutral beam expansion optical contact 400 both include a focusing lens assembly 301 and a connector 302. The neutral beam expansion optical contact uses a self-focusing lens to collimate the light beam, regardless of pins or sockets, has strong compatibility, and is conducive to reducing connector manufacturing costs.

[0084] It should be understood that the above-mentioned plug shell 210, socket shell 110, packaging shell 230, wire seal body, etc. have multiple cavities according to the specific transmission optical path requirements, and a neutral beam expanding optical contact can be placed in each cavity. The first neutral beam expanding optical contact 300 and the second neutral beam expanding optical contact 400 transmit optical signals after the connectors are fully connected.

[0085] Combination Figures 1 to 9 As shown, according to an embodiment of the present invention, the assembly method of the socket housing 110 is as follows:

[0086] Install the contact housing 120 from the head of the socket housing 110 into the second socket 111, and then tighten it with screws. Put the sealing gasket 130 on the outer wall of the contact housing 120 and press it into the bottom of the second socket 111. Insert the first neutral beam expansion optical contact 300 into the first cavity 101, and then insert the socket wire seal 140 from the rear end of the socket housing 110 and align it with the position of the positioning column 244. Then, install the retaining ring 11 and the retaining ring 12 in the direction of the step surface 243 in turn. The retaining ring 12 is inserted into the annular groove 216, and the protruding structure is engaged with the positioning hole 217 to limit the retaining ring 11 axially.

[0087] Combination Figures 1 to 9 As shown, according to an embodiment of the present invention, the assembly method of the aforementioned plug shell 210 is as follows: after assembling the first shell 231 and the second shell 232 to form the packaging shell 230, the packaging shell 230 is inserted into the first jack 211, and the first connecting piece 233 and the blind hole 219 are aligned, and then the second connecting piece 234 is used to fix the packaging shell 230 to the end face 218 at the bottom of the first jack 211, and the second neutral beam expansion optical contact 400 is inserted into the second cavity 201, and then the plug wire seal 240 is assembled, and the assembly process is the same as the assembly steps of the socket wire seal 140.

[0088] Combination Figures 1 to 9 As shown, according to an embodiment of the present invention, the assembly method of the above-mentioned nut 220 is as follows: when the nut 220 is installed to the outer wall of the plug housing 210 from the tail end of the plug housing 210 to the head end, the inner convex ring 222 can be fitted with the outer convex ring 212 to achieve axial limitation of the two, and then the corrugated spring 21, the dynamic retaining ring 22, the static retaining ring 23 and the retaining spring 24 are sequentially installed into the accommodating groove 224 from the tail end of the plug housing 210. At this time, the dynamic retaining ring 22 and the static retaining ring 23 are tightly attached, so that the nut 220 is only allowed to rotate in one direction around the plug housing 210.

[0089] Combination Figures 1 to 9 As shown, according to an embodiment of the present invention, the assembly method of the aforementioned socket 100 and plug 200 is as follows: the plug housing 210 is inserted into the second jack 111, and the nut 220 is rotated so that the nut 220 is threadedly connected to the outer wall of the socket housing 110 until the socket housing 110 contacts the outer convex ring 212. At this time, the plug housing 210 fits with the sealing gasket 130, and a good sealing effect can be achieved.

[0090] Therefore, through the above-mentioned assembly process of the embodiment of the present invention, reliable and stable connection and fixation are performed by mechanical means without using glue bonding process to ensure the high temperature resistance level of the connector.

[0091] Furthermore, according to the high temperature resistant non-contact expanded beam optical fiber connector of the above embodiment, a sample of the expanded beam optical fiber connector is designed and a 300°C high temperature resistance performance test is conducted. The test steps are as follows:

[0092] Step 1: At room temperature (25±10)℃, put all the tested samples into the high temperature box, and lead them to the test equipment outside the test box through the test line. During this process, the tested samples are tested for performance;

[0093] Step 2. Raise the temperature to (300±5)℃ at a heating rate of >3℃ / min and keep it warm for 1.2h. During this process, the performance of the tested samples is tested. Step 3. Open the high temperature box directly, cool down to room temperature (25±10)℃ for 0.5h, perform performance test on the tested samples, and keep it warm for 0.5h.

[0094] The above is one cycle period, and the experiment was carried out for multiple cycles. After multiple cycle tests, the reliability and insertion loss of the expanded beam optical fiber connector samples designed according to the present invention met the requirements at both normal temperature and high temperature.

[0095] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A high temperature resistant non-contact expanded beam optical fiber connector, characterized in that: It comprises a socket (100) and a plug (200); A first neutral beam expanding optical contact piece (300) is provided in the socket (100), and a second neutral beam expanding optical contact piece (400) is provided in the plug (200); when the socket (100) and the plug (200) are butt-jointed, the first neutral beam expanding optical contact piece (300) and the second neutral beam expanding optical contact piece (400) are non-contact coupled; The socket (100) comprises a socket housing (110), a contact housing (120) and a socket wire seal (140); the contact housing (120) and the socket wire seal (140) are respectively mounted on the head and tail of the socket housing (110); the contact housing (120), the socket housing (110) and the socket wire seal (140) together form a first cavity (101) for accommodating the first neutral beam expansion optical contact (300); The plug (200) comprises a plug housing (210), a nut (220), a packaging housing (230) and a plug wire seal (240); the packaging housing (230) and the plug wire seal (240) are respectively mounted on the head and tail of the plug housing (210); the nut (220) is mounted on the outer wall of the plug housing (210) from the tail direction, and the movement of the nut (220) along the axial direction of the plug housing (210) is limited by an elastic limiting structure (20); the plug housing (210), the packaging housing (230) and the plug wire seal (240) together form a second cavity (201) for accommodating the second neutral beam expansion optical contact (400); The socket wire seal (140) and the plug wire seal (240) both have a step structure; the socket wire seal (140) is fixed to the rear portion of the socket housing (110) via a first limiting structure (10a), the first limiting structure (10a) being in contact with the step structure; the plug wire seal (240) is fixed to the rear portion of the plug housing (210) via a second limiting structure (10b), the second limiting structure (10b) being in contact with the step structure; The contact housing (120) is fixed to the socket housing (110) via a threaded connection, and the packaging housing (230) is fixed to the plug housing (210) via a threaded connection.

2. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 1, characterized in that: The socket wire seal (140) and the plug wire seal (240) both comprise a first cylinder (241) and a second cylinder (242), the diameter of the second cylinder (242) being smaller than the diameter of the first cylinder (241), and a step surface (243) being formed between the first cylinder (241) and the second cylinder (242), the step surface (243) being oriented outwards.

3. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 2, characterized in that: The first limiting structure (10a) and the second limiting structure (10b) both comprise a retaining ring (11) and a snap ring (12); the outer wall of the snap ring (12) is provided with a protruding structure; the tails of the socket housing (110) and the plug housing (210) are both provided with an annular groove (216); a positioning hole (217) is provided in the annular groove (216); the retaining ring (11) is assembled to the step surface (243); the snap ring (12) is snapped into the annular groove (216); the protruding structure is snapped into the positioning hole (217), and the retaining ring (11) is axially limited.

4. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 2 or 3, characterized in that: The end surface of the first cylinder (241) is provided with a positioning column (244), and the tails of the socket housing (110) and the plug housing (210) are provided with corresponding positioning grooves, and the positioning column (244) can be inserted into the positioning grooves, so that the socket wire seal body (140) and the socket housing (110) are circumferentially positioned, and the plug housing (210) and the plug wire seal body (240) are circumferentially positioned.

5. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 1, characterized in that: The plug housing (210) is constructed such that a first plug hole (211) is provided at the head thereof, the encapsulation housing (230) is installed in the first plug hole (211), the encapsulation housing (230) comprises a first housing (231) and a second housing (232), the first housing (231) and the second housing (232) being fixed by a first connecting member (233), the first connecting member (233) having an exposed portion, an end face (218) of the first plug hole (211) being provided with a blind hole (219) for accommodating the first connecting member (233), the end face (218) being further provided with a screw hole (215), the first housing (231) and the second housing (232) being connected together to a second connecting member (234) in the screw hole (215) being fixed to one side of the end face (218), and an area for coupling a first neutral beam expanding optical contact member (300) and a second neutral beam expanding optical contact member (400) being provided in the encapsulation housing (230).

6. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 1, characterized in that: The outer wall of the plug housing (210) is provided with an outer convex ring (212), a positioning key (213) and a retaining ring groove (214) in sequence from the head to the tail, the outer diameter of the outer convex ring (212) being larger than the outer diameters of other parts of the packaging housing (230), and the inner wall of the nut (220) is provided with an inner convex ring (222), the inner diameter of the inner convex ring (222) being smaller than the inner diameters of other parts; The nut (220) is installed on the outer wall of the plug housing (210) from the rear end of the plug housing (210) toward the head end, and the inner convex ring (222) is fitted with the outer convex ring (212), a first side of the inner convex ring (222) forms a step positioning surface (223), and a second side forms a receiving groove (224), and the elastic limiting structure (20) is located in the receiving groove (224).

7. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 6, characterized in that: The elastic limiting structure (20) comprises a corrugated spring (21), a dynamic clamping ring (22), a static clamping ring (23) and a clamping spring (24) which are sequentially loaded into the receiving groove (224) from the rear end of the plug housing (210); the clamping spring (24) is clamped into the clamping spring groove (214) so ​​that the dynamic clamping ring (22) and the static clamping ring (23) are tightly attached to each other; the dynamic clamping ring (22) is circumferentially fixed to the nut (220); the static clamping ring (23) is circumferentially fixed to the plug housing (210); the fitting surfaces of the dynamic clamping ring (22) and the static clamping ring (23) are provided with clamping teeth so that the nut (220) is only allowed to rotate in one direction around the plug housing (210).

8. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 6, characterized in that: The head of the socket housing (110) is provided with a second plug hole (111), and a sealing gasket (130) is provided in the second plug hole (111). The outer wall of the head of the socket housing (110) is provided with an external thread (112), and the inner wall of the nut (220) is provided with an internal thread (221). When the nut (220) and the socket housing (110) are tightened, the head of the socket housing (110) fits with the end surface of the outer convex ring (212), and the head of the plug housing (210) fits with the sealing gasket (130).

9. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 1, characterized in that: The socket wire seal (140) and the plug wire seal (240) are made of high temperature resistant silicone rubber material.

10. The high temperature resistant non-contact expanded beam optical fiber connector according to claim 7, characterized in that: The dynamic clamp ring (22) and the static clamp ring (23) are made of titanium alloy, and the surfaces of the dynamic clamp ring (22) and the static clamp ring (23) are provided with a wear-resistant coating.

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