CN113687475B

CN113687475B - Pretermination waterproof optical fiber connecting assembly and adapter

Info

Publication number: CN113687475B
Application number: CN202110924491.9A
Authority: CN
Inventors: 吴明; 吴体荣; 曾大庆; 朱礼吉; 崔洁
Original assignee: Nanjing Huamai Technology Co Ltd
Current assignee: Nanjing Huamai Technology Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2022-10-11
Anticipated expiration: 2041-08-12
Also published as: CN113687475A

Abstract

The invention discloses a pre-terminated waterproof optical fiber connecting assembly and an adapter, and relates to the technical field of communication network equipment. The waterproof optical fiber connecting assembly comprises a first inner sleeve, a limiting clamp, an inner long sleeve, a waterproof outer sleeve and a sleeve; a ferrule assembly is arranged in the first inner sleeve, and a second spring is sleeved at the tail end of the ferrule assembly; one end of the inner long sleeve is connected with the first inner sleeve, and the other end of the inner long sleeve sequentially passes through the first spring, the waterproof outer sleeve and a sleeve ring used for limiting the axial displacement of the waterproof outer sleeve and is connected with the sleeve; the inner side of the waterproof jacket is provided with a first connecting groove. According to the pre-terminated waterproof optical fiber connecting assembly and the adapter, the waterproof optical fiber is mounted between the adapter in a specific mounting mode, so that the mounting process is simplified, blind mounting can be realized, the mounting efficiency is improved, meanwhile, the connector is smaller in size, high-density arrangement can be realized, and the space utilization rate is improved.

Description

Pretermination waterproof optical fiber connection assembly and adapter

Technical Field

The invention relates to the technical field of communication network equipment, in particular to a pre-terminated waterproof optical fiber connecting assembly and an adapter.

Background

At present, outdoor optical cables are generally adopted to enter a machine room or an optical cross connecting box or a corridor box for fusion splicing when the optical cables enter the room, and finished jumpers prefabricated and pulled away in factories can be adopted to be connected into the interior of the former box for termination or waterproof joints are added on the finished jumpers. If a mode of adding a waterproof joint to the finished product patch cord to be connected into the optical cable is adopted, during operation, the connector of the optical patch cord is firstly aligned with the interface to be installed, then the waterproof head is screwed to the corresponding thread position, and the joint is tightly wrapped from bottom to top by using a waterproof adhesive tape, so that the purpose of preventing water vapor from permeating is achieved.

The existing waterproof joint arranged on a finished product jumper is divided into an outer joint and an inner joint, the waterproof outer joint is firstly pulled down when the waterproof joint is arranged, the inner joint is arranged by aligning with the direction of an interface, and the outer joint is pulled up and screwed after the waterproof joint is arranged; although the waterproof joint can be operated outside a box or outside the box, the joint is large in size, cannot be distributed in high density, cannot be mounted in a blind mode, and is not beneficial to joint installation; meanwhile, when the external connector is installed, the external connector adopts a threaded fastening connection mode, so that the optical cable is easy to twist, and further the attenuation of the optical fiber is increased or the optical fiber is broken.

Disclosure of Invention

In order to solve the problems that the joint is difficult to install, cannot be installed in a blind mode and cannot be discharged in a high-density mode, the invention aims to provide the pre-terminated waterproof optical fiber connecting assembly and the adapter.

The invention provides the following technical scheme:

in a first aspect, the invention provides a pre-terminated waterproof optical fiber connecting assembly, which comprises a first inner sleeve, a limiting clamp, an inner long sleeve, a waterproof outer sleeve and a sleeve; a core insert assembly is arranged in the first inner sleeve, and a second spring is sleeved at the tail end of the core insert assembly; one end of the inner long sleeve is connected with the first inner sleeve, and the other end of the inner long sleeve sequentially passes through the first spring, the waterproof outer sleeve and the sleeve ring for limiting the axial displacement of the waterproof outer sleeve and is connected with the sleeve; the inner side of the waterproof jacket is provided with a first connecting groove. The waterproof optical fiber connecting assembly provided by the invention is smaller in volume, and the rapid assembly of the optical fiber connecting assembly and the adapter is realized by arranging the specific first connecting groove structure, blind installation can be realized, and the installation efficiency of the optical fiber connecting assembly and the adapter is greatly improved.

Preferably, the waterproof optical fiber connecting assembly further comprises a connecting sleeve; one end of the connecting sleeve is sleeved on the inner long sleeve and is arranged between the waterproof outer sleeve and the sleeve ring, and the other end of the connecting sleeve is provided with a waterproof cap matched with the waterproof outer sleeve; the surface of the waterproof cap is symmetrically provided with first short cylinders matched with the connecting grooves; before the connecting assembly is assembled with the adapter, the connecting sleeve is bent, so that the waterproof cap is arranged on the waterproof jacket through the matching of the first short cylinder and the first connecting groove to protect the waterproof jacket.

Preferably, the number of the first connecting grooves is two, and the first connecting grooves are centrosymmetric along the inner ring surface of the waterproof jacket; the first connecting groove comprises a horizontal groove and a vertical groove to form an L-shaped groove, and the top of the horizontal groove is communicated with a semicircular groove. The L-shaped groove is arranged to play a role in guiding; the semicircular groove is arranged, so that the limiting effect can be achieved, and the connection between the connecting assembly and the adapter is quicker and firmer.

Preferably, the end part of the first inner sleeve is provided with a slot; one end of the limiting clamp is provided with a guide block matched with the slot, the other end of the limiting clamp is provided with a first circular step, and a plurality of first annular grooves are uniformly distributed on the outer surface of the first circular step; a small pressure ring for fixing the optical cable is sleeved on the first round step; the tail part of the inner long sleeve is provided with a second round step; and the second round step sleeve is provided with a large pressure ring for fixing the optical cable. If a double-layer sheath optical cable needs to be installed in the waterproof optical fiber connecting assembly, the large pressure ring is installed firstly to fix the inner sheath in the connecting assembly, and then the small pressure ring is installed to fix the outer sheath in the connecting assembly; when the single-layer sheath optical cable is installed, the optical cable can be fixed only by using the large pressure ring; through setting up big clamping ring and little clamping ring, can compatible individual layer sheath bundle form optical cable and double-deck sheath bundle form optical cable for the use of this product is more nimble, and application scope is wider.

Preferably, a support is arranged in the middle of the limiting clamp; the rear end face of the support is provided with a guide boss; the end part of the inner long sleeve is provided with a notch matched with the guide boss; the surface of the limiting clamp is symmetrically provided with locking bosses; the locking boss is arranged between the support and the first circular step; the inner long sleeve is provided with a clamping groove matched with the locking boss; through direction boss and breach gomphosis, can lead the installation of spacing card, impress the locking boss in the draw-in groove again, further improve the installation steadiness between spacing card and the interior long cover.

Preferably, an external boss is arranged on the support; and two limiting bosses used for limiting the rotation angle of the external boss are arranged on the inner ring surface of the waterproof jacket. Through the rotation angle of injecing spacing card in waterproof jacket, prevent that the too big deformation that causes of the optical cable torsion angle in the spacing card, and then influence the normal use of optical cable.

Preferably, the sleeve is a heat shrinkable tube, and a protective sleeve is sleeved outside the sleeve; the sleeve is heated at high temperature, so that the connection between the sleeve and the inner long sleeve is tighter, and the water seepage at the connection part of the inner long sleeve and the sleeve is prevented to influence the use of the optical cable; the protective sleeve is additionally arranged, so that the mechanical strength of the connecting assembly is improved, and the optical cable is further protected.

In a second aspect, the present invention provides an adapter for assembling a preterminated water-tight fiber optic assembly, comprising a second inner sleeve, a sleeve, and a body; the second inner sleeve is provided with a connecting hole; a through hole coaxial with the connecting hole is formed in the main body; one end of the sleeve is arranged in the connecting hole, and the other end of the sleeve is arranged in the through hole; the main part surface symmetry is equipped with the short cylinder of second with the spread groove adaptation, and the short cylinder of second is the same with first short cylinder structure, size homogeneous phase. The second short cylinder is matched with the first connecting groove, so that the waterproof connecting assembly and the adapter can be installed more quickly, and the installation efficiency of the waterproof assembly is improved.

Preferably, the surface of the second inner sleeve is provided with two buckles, a first clamping plate and a second clamping plate at equal intervals; the first clamping plate and the second clamping plate are arranged in a staggered manner with the two buckles; a guide groove matched with the buckle is formed in the inner side of the main body; a limiting table top which is respectively contacted with the end parts of the first clamping plate and the second clamping plate is arranged between the two guide grooves; through setting up first cardboard and second cardboard and spacing mesa cooperation, make things convenient for operating personnel to distinguish the positive and negative of second endotheca fast, ensure that the second endotheca can correctly install between the main part, avoid because installation error, extension operating time.

Preferably, the middle part of the main body is sleeved with a dust cap matched with the main body; a second connecting groove is formed in the inner side of the dustproof cap, and the second connecting groove and the first connecting groove are identical in structure and size; before the adapter is assembled with the connecting assembly, the dustproof cap connecting rod is bent, so that the dustproof cap is installed on the main body, and the dustproof effect is achieved.

The invention has the beneficial effects that:

(1) According to the invention, the first connecting groove and the second short cylinder are matched, so that the rapid installation between the adapter and the waterproof optical fiber connecting assembly is realized, the operator can push the second short cylinder on the main body of the adapter into the first connecting groove and rotate the second short cylinder to complete the assembly, the precision requirement is low, and the operator can judge whether the assembly is correct according to the hand feeling, so that the blind installation is realized, the inconvenience caused by the traditional installation mode is avoided, and the installation efficiency is greatly improved; and the connecting assembly has compact structure and small volume, can be discharged at high density, and improves the space utilization rate.

(2) In order to improve the flexibility of the invention, the connecting component is internally provided with the large pressure ring and the small pressure ring, so that not only can a single-layer sheath bundle-shaped optical cable be installed, but also a double-layer sheath bundle-shaped optical cable can be installed, and an operator can select the optical cable according to the requirement.

(3) In order to further improve the assembly efficiency of the adapter, the first clamping plate and the second clamping plate are symmetrically arranged on the surface of the second inner sleeve, the first clamping plate and the second clamping plate are different in length, and the heights of the limiting table tops in the corresponding main bodies are different, so that an operator can quickly judge whether the second inner sleeve is assembled correctly or not by means of hand feeling, and blind assembly is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is an exploded view of a component of the connection assembly of the present invention;

FIG. 2 is a schematic view of an assembled configuration of the connection assembly of the present invention;

FIG. 3 is an exploded view of a part of the adapter of the present invention;

FIG. 4 is a schematic view of an assembled structure of the adapter of the present invention;

FIG. 5 is a schematic structural view of a first inner sleeve of the present invention;

FIG. 6 is a schematic structural view of a limit card of the present invention;

FIG. 7 is a schematic structural view of the inner length sleeve of the present invention;

FIG. 8 is a schematic view of the construction of the waterproof jacket of the present invention;

FIG. 9 is a schematic structural view of a second inner sleeve of the present invention;

FIG. 10 is a schematic view of the main structure of the adapter of the present invention;

fig. 11 is a sectional view showing an assembly structure of the connecting member and the adapter of the present invention.

Description of reference numerals:

101. a first inner sleeve; 1011. a slot; 102. a ferrule assembly; 103. a limiting card; 1031. a support; 1032. a guide boss; 1033. locking the boss; 1034. a first circular step; 1035. a boss is arranged outside; 1036; a guide block; 104. an inner long sleeve; 1041. a notch; 1042. a card slot; 1043. a second circular step; 1044. a second ring groove; 105. a waterproof jacket; 1051. a limiting boss; 1052. a first connecting groove; 106. a collar; 107. a protective sleeve; 108. a sleeve; 109. a large compression ring; 110. connecting sleeves; 111. a waterproof cap; 112. a second seal ring; 113. a first spring; 114. a first seal ring; 115. a small compression ring; 116. a second spring; 201. a nut; 202. a dust cap; 203. a main body; 2031. a second short cylinder; 2032. a through hole; 2033. a limiting table surface; 2034. a guide groove; 204. a fourth seal ring; 205. a sleeve; 206. a second inner sleeve; 2061. buckling; 2062. a first clamping plate; 2063. connecting holes; 2064. a second clamping plate; 207. and a third sealing ring.

Detailed Description

As shown in fig. 1 and 2, a pretermination waterproof optical fiber connection assembly comprises a first inner sleeve 101, a limit clamp 103, an inner long sleeve 104, a waterproof outer sleeve 105 and a sleeve 108; the ferrule assembly 102 is arranged in the first inner sleeve 101, and the tail end of the ferrule assembly 102 is sleeved with a second spring 116; one end of the inner long sleeve 104 is connected with the first inner sleeve 101, and the other end of the inner long sleeve passes through the first spring 113, the waterproof outer sleeve 105 and the lantern ring 106 used for limiting the axial displacement of the waterproof outer sleeve 105 in sequence and is connected with the sleeve 108; a second annular groove 1044 is formed in the middle lower portion of the inner long sleeve 104, the lantern ring 106 is a C-shaped lantern ring, and the lantern ring 106 is pressed into the second annular groove 1044 through external force, so that the waterproof outer sleeve 105 is prevented from axially displacing in the inner long sleeve 104; the sleeve 108 is a heat shrinkable tube, and a protective sleeve 107 is sleeved outside the sleeve; glue is coated inside the sleeve 108, and the sleeve 108 is heated at high temperature, so that the connection between the sleeve 108 and the inner long sleeve 104 is tighter, and the water seepage at the connection part of the inner long sleeve 104 and the sleeve 108 is prevented, and the use of the optical cable is prevented from being influenced; and a protective sleeve 107 is additionally arranged, so that the mechanical strength of the connecting assembly is improved, and the optical cable is further protected.

One side of the waterproof jacket 105 is provided with a hexagonal long shaft, each surface of the hexagonal long shaft is provided with a friction rib, and an operator can hold the waterproof jacket 105 conveniently to assemble the waterproof jacket through the friction ribs.

The inner side of the waterproof jacket 105 is provided with a first connecting groove 1052; the number of the first connecting grooves 1052 is two, and the two connecting grooves are centrosymmetric along the inner ring surface of the waterproof jacket 105; the first connecting groove 1052 comprises a horizontal groove and a vertical groove to form an L-shaped groove, and the top of the horizontal groove is also communicated with a semicircular groove; the L-shaped groove is arranged to play a role in guiding; the semicircular groove is arranged, so that the limiting effect can be achieved, and the connection between the connecting assembly and the adapter is quicker and more firm.

The waterproof optical fiber connecting assembly further comprises a connecting sleeve 110; one end of the connecting sleeve 110 is sleeved on the inner long sleeve 104 and is arranged between the waterproof outer sleeve 105 and the sleeve ring 106, and the other end is provided with a waterproof cap 111 matched with the waterproof outer sleeve 105; the surface of the waterproof cap 111 is symmetrically provided with a first short cylinder adapted to the first connection groove 1052. A third ring groove is formed outside the waterproof cap 111, and the second sealing ring 112 is preassembled in the third ring groove; the fitting between the waterproof cap 111 and the waterproof jacket 105 is the same as the fitting manner of the adapter body 203 and the waterproof jacket 105, and before the coupling assembly is assembled with the adapter, the coupling sleeve 110 is bent, so that the waterproof cap 111 is mounted on the waterproof jacket 105, the second seal ring 112 contacts with the inner bottom surface of the waterproof jacket 105, water seepage at the joint of the waterproof cap 111 and the waterproof jacket 105 is prevented, and the waterproof jacket 105 is protected.

As shown in fig. 3, 4, 11, an adapter for assembling a preterminated water-tight fiber optic assembly includes a second inner housing 206, a sleeve 205, and a main body 203; the second inner housing 206 is provided with a connecting hole 2063; a through hole 2032 coaxial with the connecting hole 2063 is arranged in the main body 203; one end of the sleeve 205 is arranged in the connecting hole 2063, and the other end is arranged in the through hole 2032; a second short cylinder 2031 matched with the connecting groove 1052 is symmetrically arranged on the surface of the main body 203, and the structure and the size of the second short cylinder 2031 are the same as those of the first short cylinder; when waterproof fiber connection subassembly and adapter assembly, use through the cooperation of the short cylinder 2031 of second and first connecting groove 1052 for can rapid Assembly between waterproof connection subassembly and the adapter, improved waterproof subassembly's installation effectiveness.

The middle part of the main body 203 is sleeved with a dust cap 202 matched with the main body 203, and the dust cap 202 is connected with the main body 203 through a connecting rod; a second connecting groove is formed in the inner side of the dustproof cap 202; before the adapter is assembled with the connecting assembly, the connecting rod of the dust cap is bent, so that the dust cap 202 is installed on the main body 203, and the dust-proof effect is achieved.

A nut 201 and a third sealing ring 207 are sequentially sleeved at one end of the main body 203 from outside to inside, the third sealing ring 207 is fixed on the main body 203 through the nut 201, and a buffering effect is achieved when the tail end of the main body 203 is impacted; the main part 203 opposite side still overlaps and is equipped with fourth sealing washer 204, and when installing waterproof overcoat 105 on main part 203, bottom surface contact in fourth sealing washer 204 and the waterproof overcoat 105 further guarantees the tight nature of being connected between main part 203 and the waterproof overcoat 105 to avoid steam to enter into inside the waterproof component.

As shown in fig. 5, 6 and 7, the first inner sleeve 101 has a slot 1011 at its end; one end of the limit card 103 is provided with a guide block 1036 matched with the slot 1011, and the other end is provided with a first circular step 1034; inserting the guide block 1036 of the limit card 103 into the slot 1011 to complete the installation of the limit card 103 and the first inner sleeve 101; a plurality of first ring grooves are uniformly distributed on the outer surface of the first circular step 1034; the first round step 1034 is sleeved with a small pressure ring 115 for fixing an optical cable; a second round step 1043 is arranged at the tail part of the inner long sleeve 104; the second round step 1043 is sleeved with a large press ring 109 for fixing an optical cable.

When the single-sheath optical cable is installed, the end part of the sheath is pressed into the large press ring 109, and then the large press ring 109 provided with the sheath is installed on the second round step 1043, so that the installation of the single-sheath optical cable is completed; if an operator wants to install the double-layer sheathed optical cable, the outer jacket is sleeved on the outer surface of the single-layer sheathed optical cable, the tail end of the outer jacket is pressed into the small press ring 115, and the small press ring 115 provided with the outer jacket is installed on the first circular step 1034, so that the installation of the double-layer sheathed optical cable is completed; an operator can select to install the single-layer sheath bundle-shaped optical cable or the double-layer sheath bundle-shaped optical cable according to the requirement, so that the product is more flexible to use and wider in application range.

A groove is arranged outside the inner long sleeve 104, and a first sealing ring 114 is arranged in the groove; a support 1031 is arranged in the middle of the limiting clamp 103; the rear end face of the support 1031 is provided with a guide boss 1032; a notch 1041 matched with the guide boss 1032 is formed at the end part of the inner long sleeve 104; the surface of the limit card 103 is symmetrically provided with locking bosses 1033; the locking boss 1033 is arranged between the support 1031 and the first round step 1034; the inner long sleeve 104 is provided with a clamping groove 1042 matched with the locking boss 1033; the first sealing ring 114 is preassembled in the groove, then the guide boss 1032 of the limit card 103 is embedded with the notch 1041, so that the installation of the limit card 103 can be guided, and the locking boss 1033 is pressed into the clamping groove 1042, so that the installation stability between the limit card 103 and the inner long sleeve 104 is further improved; after the waterproof outer sleeve 105 is sleeved on the inner long sleeve 104, the first sealing ring 114 is in contact with the inner bottom surface of the waterproof outer sleeve 105, so that the connection part between the inner long sleeve 104 and the waterproof outer sleeve 105 is prevented from entering water vapor, and the use of the connecting assembly is prevented from being influenced.

An external boss 1035 is arranged on the support 1031; two limit bosses 1051 used for limiting the rotation angle of the external boss 1035 are arranged on the inner annular surface of the waterproof jacket 105; the rotation angle of the limiting clamp 103 in the waterproof jacket 105 is limited by arranging the limiting boss 1051, so that the deformation caused by the overlarge torsion angle of the optical cable in the limiting clamp 103 is prevented, and the normal use of the optical cable is further influenced.

As shown in fig. 9 and 10, two fasteners 2061, a first fastener plate 2062 and a second fastener plate 2064 are arranged on the surface of the second inner sleeve 206 at equal intervals; the first clamping plate 2062 and the second clamping plate 2064 are arranged in a staggered manner with the two buckles 2061; a guide groove 2034 matched with the buckle 2061 is arranged on the inner side of the main body 203; a limiting table surface 2033 which is respectively contacted with the end parts of the first clamping plate 2062 and the second clamping plate 2064 is arranged between the two guide grooves 2034; the length of first cardboard 2062 and second cardboard 2064 is different, through setting up first cardboard 2062 and second cardboard 2064 and spacing mesa 2033 cooperation for operating personnel can rely on feeling, judges fast whether the second endotheca 206 correctly assembles, thereby realizes blind dress, can avoid because the installation is wrong, leads to operating time's extension.

The working modes of the waterproof optical fiber connecting assembly and the adapter are as follows:

1) When the waterproof optical fiber connecting assembly is assembled with the adapter, the adapter main body 203 is opened downwards and buckled on the waterproof jacket 105, the main body 203 is rotated to enable the second short cylinder 2031 to slide into the first connecting groove 1052, when the second short cylinder 2031 is pushed to the bottom of the first connecting groove 1052, the main body 203 is rotated to enable the second short cylinder 2031 to be clamped into the semicircular groove, and then the assembly of the connecting assembly and the adapter is completed;

2) When waterproof fiber optic connection subassembly and adapter are not assembled, refer to the assembled mode of coupling subassembly and adapter, bend adapter sleeve 110, make the first short cylinder on waterproof cap 111 and first connecting groove 1052 assemble, bend the connecting rod of dust cap 202, make the second connecting groove on dust cap 202 and the assembly of second short cylinder 2031, thereby cover waterproof cap 111 on waterproof overcoat 105, protect waterproof overcoat 105, cover dust cap 202 on adapter main part 203, protect main part 203.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A preterminated water-resistant fiber optic connection assembly, comprising: comprises a first inner sleeve (101), a limit clamp (103), an inner long sleeve (104), a waterproof outer sleeve (105) and a sleeve (108); a ferrule assembly (102) is arranged in the first inner sleeve (101), and a second spring (116) is sleeved at the tail end of the ferrule assembly (102); one end of the inner long sleeve (104) is connected with the first inner sleeve (101), and the other end of the inner long sleeve sequentially passes through the first spring (113), the waterproof outer sleeve (105) and a sleeve ring (106) used for limiting the axial displacement of the waterproof outer sleeve (105) and is connected with the sleeve (108); a first connecting groove (1052) is arranged on the inner side of the waterproof jacket (105);

a support (1031) is arranged in the middle of the limiting clamp (103); a guide boss (1032) is arranged on the rear end face of the support (1031); a notch (1041) matched with the guide boss (1032) is formed in the end part of the inner long sleeve (104); the surface of the limiting card (103) is symmetrically provided with locking bosses (1033); the locking boss (1033) is arranged between the support (1031) and the first round step (1034); the inner long sleeve (104) is provided with a clamping groove (1042) matched with the locking boss (1033);

an external boss (1035) is arranged on the support (1031); two limiting bosses (1051) used for limiting the rotation angle of the external boss (1035) are arranged on the inner annular surface of the waterproof jacket (105).

2. A preterminated water-resistant fiber optic connection assembly of claim 1, wherein: the device also comprises a connecting sleeve (110); one end of the connecting sleeve (110) is sleeved on the inner long sleeve (104) and is arranged between the waterproof outer sleeve (105) and the sleeve ring (106), and the other end is provided with a waterproof cap (111) matched with the waterproof outer sleeve (105); the surface of the waterproof cap (111) is symmetrically provided with a first short cylinder matched with the first connecting groove (1052).

3. A preterminated water-resistant fiber optic connection assembly according to claim 2, wherein: the number of the first connecting grooves (1052) is two, and the first connecting grooves are in central symmetry along the inner ring surface of the waterproof jacket (105); the first connecting groove (1052) comprises a horizontal groove and a vertical groove to form an L-shaped groove, and the top of the horizontal groove is also communicated with a semicircular groove.

4. A preterminated water-resistant fiber optic connection assembly according to claim 2, wherein: a slot (1011) is formed in the end of the first inner sleeve (101); one end of the limiting clamp (103) is provided with a guide block (1036) matched with the slot (1011), the other end of the limiting clamp is provided with a first round step (1034), and a plurality of first ring grooves are uniformly distributed on the outer surface of the first round step (1034); a small pressure ring (115) for fixing an optical cable is sleeved on the first round step (1034); a second round step (1043) is arranged at the tail part of the inner long sleeve (104); and the second round step (1043) is sleeved with a large pressure ring (109) for fixing an optical cable.

5. A preterminated water-resistant fiber optic connection assembly according to claim 2, wherein: the sleeve (108) is a heat shrinkable tube, and a protective sleeve (107) is sleeved outside the sleeve.

6. An adapter for use with the preterminated water-tight fiber optic connection assembly of any of claims 1-5, wherein: comprises a second inner sleeve (206), a sleeve (205) and a main body (203); the second inner sleeve (206) is provided with a connecting hole (2063); a through hole (2032) coaxial with the connecting hole (2063) is arranged in the main body (203); one end of the sleeve (205) is arranged in the connecting hole (2063), and the other end of the sleeve is arranged in the through hole (2032); the surface of the main body (203) is symmetrically provided with a second short cylinder (2031) matched with the first connecting groove (1052), and the structure and the size of the second short cylinder (2031) are the same as those of the first short cylinder.

7. The adapter of claim 6, wherein: the surface of the second inner sleeve (206) is provided with two buckles (2061), a first clamping plate (2062) and a second clamping plate (2064) at equal intervals; the first clamping plate (2062) and the second clamping plate (2064) are arranged in a staggered mode with the two buckles (2061); a guide groove (2034) matched with the buckle (2061) is formed in the inner side of the main body (203); a limiting table top (2033) which is respectively contacted with the end parts of the first clamping plate (2062) and the second clamping plate (2064) is arranged between the two guide grooves (2034).

8. The adapter of claim 7, wherein: the middle part of the main body (203) is sleeved with a dust cap (202) matched with the main body (203); the inner side of the dustproof cap (202) is provided with a second connecting groove, and the second connecting groove and the first connecting groove (1052) are identical in structure and size.