CN108923164B - Underwater wet plug connector - Google Patents

Abstract

The invention relates to an underwater wet plug connector, comprising: male part: the electric power tool comprises a male outer barrel with front and rear openings, a male rear baffle plate for fixedly sealing the rear end of the male outer barrel, a male front baffle plate, a male sheath, a male spring with two ends respectively abutting against the male front baffle plate and the male rear baffle plate and moving towards the front end of the male outer barrel, a male electric core piece and the like, wherein the male electric core piece sequentially passes through the male rear baffle plate and the male front baffle plate in a sealing manner; female head piece: including front and back open-ended female outer tube, female first baffle, female first backplate, female first base, seal mounting female first sheath on female first backplate to and seal in proper order pass female first backplate, female first base and female first electric core spare etc. of preceding baffle. Compared with the prior art, the underwater wet plug connector can work within the range of 0 to 6000 m in water depth, can adapt to working environments such as rivers, lakes, oceans and the like, can reach 6000VDC withstand voltage level, and has the characteristics of high withstand voltage level, long creepage distance, multiple plug times and the like.

Description

Underwater wet plug connector

Technical Field

The invention belongs to the technical field of ocean engineering, and relates to an underwater wet plug connector.

Background

Currently known underwater wet plug connectors mostly adopt a large oil liquid discharge mode, and oil liquid is generally continuously discharged in the whole insertion process, so that the plug times are limited. On the other hand, the existing underwater wet plug connector pays attention to insulation between the conductors and an external water body, but the insulation reduction between the conductors caused by the mixing of oil and water is neglected, so that the use reliability of the underwater wet plug connector is reduced, and the problem is more serious in the occasion of higher voltage. Still other simple approaches to seal notching use oil to drain the body of water from the junction, which is very susceptible to insulation degradation in the event of water trapped at the junction, and also unstable in reliability.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an underwater wet plug connector.

The aim of the invention can be achieved by the following technical scheme:

an underwater wet connect-disconnect connector comprising:

male part: the device comprises a male outer barrel with front and rear openings, a male rear baffle fixedly sealing the rear end of the male outer barrel, a male front baffle which is arranged on the inner side of the front end of the male outer barrel in a sealing way and can move along the inner wall of the male outer barrel, a male sheath which is arranged on the male rear baffle in a sealing way, a male spring with two ends respectively abutting against the male front baffle and the male rear baffle and moving towards the front end of the male outer barrel, and a male electric core piece which sequentially passes through the male rear baffle and the male front baffle in a sealing way, wherein a limiting bulge limiting the outward moving distance of the male front baffle is arranged on the inner side of the front end of the male outer barrel, a corrugated pipe and a compensator which are sequentially sealed and enclose the male electric core piece from inside to outside are arranged between the male front baffle and the male rear baffle, the male sheath, the compensator and the male front baffle enclose a communication space filled with insulating oil, a first channel which is communicated with the corrugated pipe and the male sheath and is communicated with the corrugated pipe in a unidirectional way, and a second channel which is communicated with the front side of the male electric core piece is arranged between the corrugated pipe and the male electric core piece and the front baffle;

Female head piece: the device comprises a front outer cylinder and a rear outer cylinder with front and rear openings, a front baffle and a rear baffle which respectively fix and seal the front end and the rear end of the front outer cylinder, a front base which is respectively in sealing connection with the front baffle and the rear baffle, a front sheath which is arranged on the front baffle and the rear baffle, and a front electric core piece which sequentially passes through the front baffle, the front base and the front baffle, a pressure compensation diaphragm which surrounds the front base is also arranged between the front baffle and the rear baffle, a buffer cavity is formed between the front end of the front base and the front baffle around the front electric core piece, a mounting cavity which is arranged in the front base is internally processed and provided with the front electric core piece, the front electric core piece comprises a front electric core, a rear electric core and a front spring which is respectively connected with the two ends, wherein the bottom of the front electric core and the mounting cavity are in a sliding manner, the front base, the buffer cavity and the front baffle are sequentially sealed, the front side surface of the front electric core is fixedly arranged, the front side surface of the front electric core and the rear baffle is also provided with a pressure compensation diaphragm which surrounds the front base, the front side surface is communicated with the pressure compensation cavity, the front side surface of the front electric core piece is communicated with the pressure compensation cavity, the front side of the front electric core is communicated with the pressure compensation cavity, the pressure compensation cavity is communicated with the pressure compensation cavity is formed with the inner cavity, and the pressure compensation cavity is communicated with the front cavity, and the pressure compensation cavity is communicated with the pressure compensation cavity, and the pressure compensation cavity is communicated with the pressure cavity.

Furthermore, the female head front cell is of a two-section integrated cylindrical structure, wherein a front cell sleeve is sleeved on one section of the small diameter and penetrates through the front end of the female head base and the female head front baffle in a sealing manner, the head of one section of the small diameter is recessed in the front cell sleeve, a butt joint hole matched with the head of the male head cell piece is formed, and one section of the large diameter is positioned in the installation cavity and is in sliding sealing with the inner wall of the installation cavity.

Furthermore, the bottom of the large-diameter section of the front cell of the female head is hollowed out to form a hollow groove for accommodating the female head spring.

Further, the pressure compensation diaphragm comprises a middle pressure compensation diaphragm and an outer pressure compensation diaphragm which are sequentially arranged at intervals and enclose the mother head base, and a channel for communicating the outer pressure compensation diaphragm with the mother head sheath is arranged in the area between the outer pressure compensation diaphragm and the middle pressure compensation diaphragm of the mother head rear baffle;

the compensator comprises an inner compensator and an outer compensator which are sequentially arranged at intervals and enclose the corrugated pipe, and a channel which is used for communicating the outer compensator with the male head sheath is arranged in the area between the outer compensator and the inner compensator on the male head rear baffle.

Furthermore, the female head front baffle and the female head rear baffle are respectively and oppositely provided with a female head outer check ring and a female head middle check ring, and the outer pressure compensation diaphragm and the middle pressure compensation diaphragm are respectively and hermetically fixed at the outer sides of the female head outer check ring and the female head middle check ring through an outer diaphragm locking belt and a middle diaphragm locking belt;

the male front baffle and the male rear baffle are respectively and oppositely provided with a male outer check ring and a male inner check ring, and the outer compensator and the inner compensator are respectively and tightly locked on the outer sides of the male outer check ring and the male inner check ring through an outer locking belt and an inner locking belt.

Still further, outside pressure compensation diaphragm and middle part pressure compensation diaphragm's both ends inboard be equipped with respectively and fall V type arch, fall V type arch respectively with female head outer retaining ring and female head middle part retaining ring corresponding position coincide and hug closely.

Further, the female head base comprises a female head front base and a female head rear base which are connected in a sealing mode through base connecting bolts, wherein the front end of the female head front base is connected with a female head inner check ring arranged at the middle position of a female head front baffle in a sealing mode through a supporting sleeve, the buffer cavity is formed, and the bottom end face of the female head rear base is fixed and sealed with the female head rear baffle.

Further, the male and female springs are always in a compressed state, and the rigidity of the male spring is greater than that of the female spring.

Furthermore, the front end of the male outer cylinder is also provided with a buckle, the outward end of the buckle extends towards the center to form a tail hook, and the front end of the female outer cylinder is provided with a conical annular inverted boss;

when the male head piece is in butt joint with the female head piece, the tail hook clamps the conical annular inverted boss and prevents the conical annular inverted boss from falling out.

Further, a front electric core seat for the front electric core piece to penetrate out is arranged on the front baffle plate of the front head, the front end of the front electric core seat of the front head protrudes out of the front baffle plate of the front head and is sealed and clung to the front end face of the front baffle plate of the front head, and diversion trenches are also distributed on the front end face of the front electric core seat of the front head along the radial direction;

the male electric core sheath is formed by three sections of cylinders with different diameters which are sequentially connected from inside to outside, wherein the section with the smallest diameter in the three sections of cylinders is used for the male electric core member to pass through in a sealing manner and is matched with the front end of the female electric core member in size, the outer circumferential surface of the section with the middle diameter is sealed with the male front baffle, the section with the largest diameter is tightly attached to the outer side end surface of the female front baffle, and the outer edge of the outer circumferential surface extends forwards to form an annular groove-shaped structure which can be sealed with the protruding part of the female front electric core seat on the female front baffle in an extruding manner.

Furthermore, the male end rear baffle is provided with oil holes for communicating the inner space of the male end sheath with the outside, preferably L-shaped oil holes are adopted, the number of the oil holes is generally not less than two, and the plug of the male end oil hole can be adopted to plug after oil injection is finished.

Compared with the prior art, the invention has the following characteristics:

(1) The underwater wet plug connector adopts an internal isolation structure, so that the insulation performance between the electric cores is not influenced even if external water is brought into the connector.

(2) The underwater wet plug connector is controlled by the insulating oil one-way valve, so that the brought water body can not influence the insulation drop between the battery cell and the water body.

(3) The underwater wet plug connector has a longer creepage distance, meanwhile, the end face groove structure is adopted to control excessive discharge of insulating oil, the service life of the underwater wet plug connector is guaranteed, and meanwhile, the miniature corrugated pipe structure is adopted to ensure that the discharge performance of the insulating oil is not reduced when the plug connector is plugged each time.

Drawings

FIG. 1 is a schematic view of a male component of the present invention;

FIG. 2 is a schematic view of the structure of the female member of the present invention;

FIG. 3 is a schematic view of an axial oil drain structure of a female member according to the present invention;

FIG. 4 is a schematic illustration of the connection of the underwater wet connect-disconnect connector of the present invention;

FIG. 5 is a schematic view of a partial structure of the underwater wet plug connector of the present invention after connection;

the figure indicates:

1-male part, 101-male wire, 102-male sheath, 103-wire support sleeve bolt I, 104-wire support sleeve I, 105-one-way valve I, 106-male oil filler hole plug, 107-male end back plate, 108-bellows seal I, 109-outer compensator locking strap I, 110-male end back bolt, 111-inner compensator locking strap I, 112-wire support sleeve II, 113-wire support sleeve bolt II, 114-male spring, 115-outer compensator, 116-inner compensator, 117-bellows, 118-male outer barrel, 119-outer compensator locking strap II, 120-inner compensator locking strap II, 121-male front bolt, 122-bellows seal II, 123-buckle, 124-male front plate, 125-male core sheath, 126-one-way valve II, 127-male core, 2-female part, 201-female front core sleeve, 202-female front core seat, 203-female front core seat inner seal, 204-female front core seat outer seal, 205-female front baffle, 206-female front core, 207-female front screw, 208-female outer barrel, 209-female front base inner radial seal, 210-external pressure compensation diaphragm locking band I, 211-middle pressure compensation diaphragm locking band I, 212-female front base plug I, 213-female front core support sleeve outer diameter seal, 214-female front core support sleeve, 215-female front base, 216-female front base plug II, 217-female front core support sleeve inner diameter seal, 218-female head spring, 219-female head front base axial inner seal, 220-female head front base axial outer seal, 221-female head front and rear base connecting bolts, 222-female head front and rear base connecting bolt seal, 223-middle pressure compensation diaphragm, 224-third check valve, 225-external pressure compensation diaphragm, 226-spring seat, 227-female head rear base, 228-female head rear base plug, 229-fourth check valve, 230-external pressure compensation diaphragm locking band two, 231-female head rear locking bolt, 232-middle pressure compensation diaphragm locking band two, 233-female rear baffle radial plug, 234-female rear base seal, 235-female rear baffle axial plug, 236-female rear cell sleeve, 237-female rear baffle, 238-female rear cell seal, 239-female rear cell, 240-female sheath, 241-female lead, 242-guide slot, 11-space one, 12-space two, 13-arrow one, 14-arrow two, 15-arrow three, 16-space three, 17-arrow four, 18-arrow five, 19-space four, 20-space five, 21-arrow six, 22-space six, 23-arrow seven, 24-arrow eight.

Description of the embodiments

The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.

The invention provides an underwater wet plug connector, which mainly comprises:

male part 1: the device comprises a male outer barrel 118 with front and rear openings, a male rear baffle 107 for fixedly sealing the rear end of the male outer barrel 118, a male front baffle 124 which is arranged on the inner side of the front end of the male outer barrel 118 in a sealing way and can move along the inner wall of the male outer barrel 118, a male sheath 102 which is arranged on the male rear baffle 107 in a sealing way, a male spring 114 with two ends respectively abutted against the male front baffle 124 and the male rear baffle 107 and abutted against the male front baffle 124 to the front end of the male outer barrel 118, and a male core part which sequentially passes through the male rear baffle 107 and the male front baffle 124 in a sealing way, wherein a limit bulge for limiting the outward movement distance of the male front baffle 124 is arranged on the inner side of the front end of the male outer barrel 118;

Female part 2: comprises a front and back opening of a main head outer cylinder 208, a main head front baffle 205 and a main head back baffle 237 which respectively fix and seal the front and back ends of the main head outer cylinder 208, a main head base with the front and back ends respectively sealed and abutted against the main head front baffle 205 and the main head back baffle 237, a main head sheath 240 sealed and installed on the main head back baffle 237, and a main head cell part sequentially sealed and penetrated through the main head back baffle 237, the main head base and the main head front baffle 205, a pressure compensation diaphragm which surrounds the main head base is also arranged between the main head front baffle 205 and the main head back baffle 237, a buffer cavity is formed between the front end of the main head base and the main head front baffle 205 around the main head cell part, an installation cavity for installing the main head cell part is processed in the main head base, the main head cell part comprises a main head front cell 206, a main head back cell 239 and a main head spring 218 with two ends respectively connected with the main head cell part, the bottom of the front battery cell 206 of the female head is sealed with the mounting cavity in a sliding manner, the head sequentially seals and penetrates through the female head base, the buffer cavity and the front baffle 205 of the female head, the rear battery cell 239 of the female head is fixedly arranged, a gap is reserved between the outer side of the front battery cell 239 of the female head and the inner wall of the buffer cavity, a channel III which is communicated with the rear section of the cavity of the female head and the buffer cavity and is communicated in a unidirectional manner towards the direction of the buffer cavity (can be realized by arranging a three-way valve 224) is further arranged in the female head base, the front end of the cavity of the female head is communicated with the pressure compensation diaphragm, the rear section of the cavity is communicated in a unidirectional manner towards the cavity of the female head, and the inner space of the area surrounded by the female head sheath 240, the front baffle 205 of the female head and the pressure compensation diaphragm is filled with insulating oil, and the space between the female head sheath 240 and the pressure compensation diaphragm is communicated.

Further, the male core element is composed of two parts, namely a male core 127 and a male wire 101, wherein the male wire 101 is made of conductive metal, preferably pure silver. The outside is an oil-resistant insulating layer, and the material is polyfluoro plastic. One end of the male lead 101 is welded to the male core 127, and the other end is connected to the cable body. The female die also includes female leads 241 connected to the female rear die 239. The front end of the male battery cell 127 is matched with the front end of the female front battery cell 206; the rear end of the male electric core 127 is connected with the male lead 101 in a welding mode; the outer cylindrical surface of the male cell 127 can be sealed and provided with a male cell sheath 125 in a hot melt manner. Preferably, the male die 127 is made of pure copper.

Further, the male sheath 102 is a truncated cone shell, one end of the large opening is thermally fused with the male rear baffle 107, one end of the small opening is connected with the cable main body, and both the two joints should have a sealing effect to prevent fluid from passing through, and the material is preferably polyetheretherketone. Likewise, the female sheath 240 is similar in construction and arrangement to the male sheath 102.

In a preferred embodiment of the present invention, the female front cell 206 has a two-section integrated cylindrical structure, wherein a front cell sleeve is further sleeved on the small-diameter section and passes through the front end of the female base and the female front baffle 205 in a sealing manner, the head of the small-diameter section is further recessed in the front cell sleeve and forms a butt hole matched with the head of the male cell, the large-diameter section is positioned in the mounting cavity and is in sliding sealing with the inner wall of the mounting cavity, and a gap seal manner can be formed between the outer wall surface of the large-diameter section and the inner wall surface of the mounting cavity. The material of the front cell 206 of the mother head is preferably pure copper or the like. Further, the front-of-head cell 206 and the front-of-head cell sheath 201 pass through the front-of-head baffle 205 by the front-of-head cell seat 202. Further, the front die sleeve 201 is in a circular tube shape, the inner cylindrical surface is thermally fused with the outer cylindrical surface at the front part of the front die 206 into a whole, and the outer cylindrical surface can be in sliding sealing fit with the inner cylindrical surface of the front die seat 202 by means of the front die seat inner sealing member 203 and the inner cylindrical surface of the front die support sleeve 214 by means of the front die support sleeve inner diameter sealing member 217 and form sliding fit with the central pore of the front base 215. Preferably, the front cell sleeve 201 of the female is made of polyether-ether-ketone. Further, the female front electric core seat 202 is in a three-section cylindrical structure, a through hole is arranged in the center, a radial diversion trench 242 is arranged on the end face of the maximum diameter and is used for guiding out redundant oil, a sealing groove is arranged on the cylindrical surface of the middle section and is used for installing the female front electric core seat outer sealing piece 204, so that the sealing effect of the corresponding inner through hole of the female front baffle 205 is achieved, the outer cylindrical surface of the minimum section is provided with threads and is in threaded pair connection with the corresponding threaded hole of the female front baffle 205, the female front electric core seat 202 is fixed on the female front baffle 205, a sealing groove is arranged at the position, close to the front end face, of the central inner hole and is used for installing the female front electric core seat inner sealing piece 203, so that sliding sealing fit with the female front electric core sleeve 201 and the front end of the male part 1 is formed, and the material is polyether ether ketone.

Furthermore, the bottom of the large-diameter section of the front-end cell 206 is hollowed to form a hollow for accommodating the female spring 218, so that the installation space of the female spring 218 can be saved and the compression stroke can be improved. Correspondingly, the female spring 218 is preferably a compression spring with two flat and tight ends, one end of the compression spring is propped against the bottom surface of the empty slot on the female front cell 206, the other end of the compression spring is propped against the axial surface of the flange of the spring seat 226, and the end surface of the spring seat 226 is propped against and fixed with the female rear cell 239, and the material is preferably 316 stainless steel. Preferably, the spring seat 226 is formed by two sections of cylinders, the thin cylindrical section is used as a guide pillar of the female head spring 218, the thicker cylindrical axial flange is propped against the axial end face of the spring seat 226, and the thicker cylindrical end face of the spring seat 226 and the large cylindrical end face of the female head rear cell 239 are integrally fused, preferably made of polyether-ether-ketone.

In a preferred embodiment of the present invention, the female rear cell 239 has a two-section cylindrical structure, the thin cylindrical end face is welded to the female lead 241, the thin cylindrical surface is integrally formed with the inner through hole of the female rear cell sheath 236 by a thermal fusion process, and the thick cylindrical end face is integrally formed with the thicker cylindrical end face of the spring seat 226 by a thermal fusion process. Preferably, the material is polyether-ether-ketone. Further, the female rear cell sleeve 236 is a three-section cylinder structure with a central through hole, the inner hole and the outer cylindrical surface of the female rear cell 239 are integrally formed by adopting a thermal fusion process, the diameter of the thickest section is the same as that of the thicker cylindrical surface of the female rear cell 239, the middle section forms sealing fit with the corresponding through hole section of the female rear baffle 237, the thinnest section is an external thread, and the thinnest section and the corresponding threaded hole of the female rear baffle 237 form a thread pair to be fixed, and preferably, the material is pure silver.

In a preferred embodiment of the present invention, the pressure compensating diaphragm includes a middle pressure compensating diaphragm 223 and an outer pressure compensating diaphragm 225 which sequentially enclose the female base at intervals, and a passage for communicating the outer pressure compensating diaphragm 225 with the female cover 240 is provided in a region between the outer pressure compensating diaphragm 225 and the middle pressure compensating diaphragm 223 of the female rear baffle 237; the compensator comprises an inner compensator 116 and an outer compensator 115 which sequentially enclose the corrugated pipe 117 at intervals, and a channel for communicating the outer compensator 115 with the male sheath 102 is arranged on the area between the outer compensator 115 and the inner compensator 116 on the male end rear baffle 107. Further, the female front baffle 205 and the female rear baffle 237 are respectively and oppositely provided with a female outer retainer ring and a female middle retainer ring, and the outer pressure compensation diaphragm 225 and the middle pressure compensation diaphragm 223 are respectively and tightly fixed at the outer sides of the female outer retainer ring and the female middle retainer ring through an outer diaphragm locking belt (comprising an outer pressure compensation diaphragm locking belt one 210 and an outer pressure compensation diaphragm locking belt two 230 which respectively correspond to two ends of the diaphragm) and a middle diaphragm locking belt (comprising a middle pressure compensation diaphragm locking belt one 211 and a middle pressure compensation diaphragm locking belt two 232 which respectively correspond to two ends of the diaphragm); the male front baffle 124 and the male rear baffle 107 are respectively and oppositely provided with a male outer retainer ring and a male inner retainer ring, and the outer compensator 115 and the inner compensator 116 are respectively and tightly locked on the outer sides of the male outer retainer ring and the male inner retainer ring through an outer locking belt (comprising an outer compensator locking belt one 109 and an outer compensator locking belt two 119 which correspond to the two ends of the outer compensator 115) and an inner locking belt (comprising an inner compensator locking belt one 111 and an inner compensator locking belt two 120 which correspond to the two ends of the inner compensator 116). Still further, the inner sides of the two ends of the external pressure compensation diaphragm 225 and the middle pressure compensation diaphragm 223 are respectively provided with an inverted V-shaped bulge, and the inverted V-shaped bulge is respectively anastomosed and clung to the corresponding parts of the female outer check ring and the female middle check ring, so that the relative axial movement between the diaphragm and the check ring can be effectively prevented. More preferably, the axial end surface of the female rear baffle 237 is provided with a through hole as an oil passing hole between the outer retainer ring and the middle retainer ring, and the axial end surface of the female rear baffle 237 is provided with a through hole near the mounting hole of the female rear battery cell casing 236 for passing through the female front and rear base connecting bolts 221; the female end baffle 237 is radially provided with 3 threaded through holes for installing the radial plugs 233 of the female end baffle, and the threaded through holes vertically penetrate through the oil holes; the female end baffle 237 is provided with 3 axial threaded through holes at one side close to the female end sheath 240 for installing the female end baffle axial plugs 235, and the threaded through holes vertically penetrate through the installation through holes of the female end baffle radial plugs 233; the female rear baffle 237 is provided with 4 threaded holes at the side far away from the female sheath 240, and the female rear baffle 237 and the female outer cylinder 208 are fixedly mounted by means of the female rear locking bolt 231; the female rear baffle 237 is provided with a stepped round hole at the position of the inner hole of the female rear base 227 corresponding to the end surface, a sealing groove is arranged in the inner cylindrical surface of the larger hole section for installing the female rear cell sealing member 238 and forming sealing fit with the outer cylindrical surface of the middle section of the female rear cell sleeve 236, and the smaller section is provided with a threaded hole for fixedly matching with the outer threaded pair of the smallest section of the male threaded cylinder of the female rear cell sleeve 236, preferably, the material is polyether-ether-ketone. The compensator, the retainer ring, etc. in the male part 1 may also be arranged in a similar manner as described above. The pressure compensation diaphragm, the compensator and the like can adopt structures such as a throat hoop and the like to fix the retainer ring and seal the joint surface, and the throat hoop is made of 316 stainless steel and the like.

In a preferred embodiment of the present invention, the female base includes a female front base 215 and a female rear base 227 that are hermetically connected by a base connection bolt, wherein the front end of the female front base 215 is hermetically connected with a female inner retainer ring disposed at the middle position of the female front baffle 205 by a support sleeve, and forms the buffer cavity, and the bottom end surface of the female rear base 227 is fixed and sealed with the female rear baffle 237. More preferably, the front base 215 of the mother head is a cylinder with three sections of cylindrical holes in the center, two ends of the cylindrical holes are big and small in the middle, wherein a sealing groove is formed at the position, close to the front end, of the largest cylinder Kong Zhumian and used for installing the radial sealing piece 209 in the front base of the mother head, so that the largest cylindrical hole cylindrical surface of the front base 215 of the mother head is in sealing fit with the outer cylindrical surface of the annular inner retainer ring on the front baffle 205 of the mother head, a front cell 206 supporting sleeve is further arranged between the bottom of the largest cylindrical hole of the front base 215 of the mother head and the rear end of the annular inner retainer ring on the front baffle 205 of the mother head, so that the sealing effect is improved, the bottom of the big cylindrical hole is in extrusion relation with the big end face of the front cell 206 supporting sleeve of the mother head, and a buffer cavity is formed between the front end of the front cell 206 supporting sleeve and the annular inner retainer ring; the middle section hole of the front base 215 of the mother head is a hole with the smallest diameter, and forms sliding fit with the outer cylindrical surface of the front section of the front battery cell 206 of the mother head, which is sleeved with the front battery cell sleeve 201 of the mother head; the middle-sized hole section of the front base 215 of the female, i.e. the front half section of the mounting cavity, forms a sliding fit with the outer cylindrical surface of the front battery cell 206 of the female; the female front base 215 is provided with a threaded through hole at a position, which is radially positioned near the end surface, of the outer cylindrical surface, and the threaded through hole is used as an oil filling hole, and the threaded hole is used for installing and fixing a first female front base plug 212 and a second female front base plug 216; the female front base 215 is provided with a through hole at a position of the outer cylindrical surface radially positioned at the bottom surface of the middle through hole, and is used for communicating the inner space of the middle pressure compensation diaphragm 223 with the mounting cavity; the end face of the front base 215 of the female near the middle hole is provided with a sealing groove for installing an axial inner sealing element of the front base 215 of the female and an axial outer sealing element of the front base 215 of the female, so as to ensure that the front base 215 of the female and the rear base 227 of the female form an axial sealing fit; a large section of through hole and a small section of through hole are arranged between the inner axial sealing element of the front main head base 215 and the sealing groove of the outer axial sealing element of the front main head base 215, the large section of through hole is used for installing a three-way valve 224 and extends to be communicated with the installation cavity, and the small section of through hole extends to be communicated with the buffer cavity, so that oil liquid can only flow to the buffer cavity from one side of the installation cavity; three threaded holes are provided in the inner side of the female front base 215 near the middle hole side end face of the female front base 215 in the axial direction of the inner seal groove, for connecting the female front base 215 and the female rear base 227 into a whole by means of the female front-rear base connecting bolts 221. Preferably, the material is polyether-ether-ketone or the like. Further, the support sleeve of the front battery cell 206 of the female is in a two-section cylindrical structure, and a round hole is arranged in the center, wherein a flange surface between the large diameter and the small diameter is axially extruded with a small retainer ring of the front baffle 205 of the female; the small-diameter outer cylindrical surface is provided with a sealing groove for installing an outer diameter sealing piece 213 of the front cell support sleeve of the female head so as to form sealing fit with the inner cylindrical surface of the small retainer ring of the front baffle 205 of the female head; the small diameter inner cylindrical surface is provided with a sealing groove for mounting the inner diameter sealing member 217 of the cell support sleeve in front of the female head so as to form sealing fit with the outer cylindrical surface of the cell sleeve 201 in front of the female head. Preferably, the material is polyether-ether-ketone.

The female rear base 227 is in a thick-wall circular tube type, wherein the inner diameter through hole is matched with the same thickness of the through hole in the female front base 215 to form a whole mounting cavity, and the outer diameter is consistent with the outer diameter of the female front base 215; the female rear base 227 is provided with two threaded through holes along the radial direction on the circumferential surface, wherein one threaded hole part is used for installing a female rear base plug 228, the through hole section directly penetrates through the inner cylindrical surface of the female rear base 227, the other threaded through hole is used for installing a one-way valve IV 229, and the through hole part is communicated with the inner space of the female rear base 227 and the inner space of the middle pressure compensation diaphragm 223; a large section through hole and a small section through hole are formed in positions corresponding to the mounting holes for mounting the third check valve 224 on the front base 215 of the female head, the large hole section is used for mounting the other end of the third check valve 224, and the small hole section is used for communicating the third check valve 224 with the mounting through hole of the plug 228 of the rear base of the female head, namely, the check valve can be communicated with the mounting cavity; the female rear base 227 is provided with a sealing groove on the end face of the third check valve 224 remote from the mounting for mounting the female front base axial outward seal 220, and simultaneously the female front base 215 and the female rear base 227 are tensioned on the axial end face of the female rear baffle 237 by means of the female front and rear base connecting bolts 221, ensuring that the two axial joint faces form a sealing fit. Preferably, the material is polyether-ether-ketone.

In a preferred embodiment of the present invention, the male spring 114 and the female spring 218 are always in a compressed state, and the rigidity of the male spring 114 is greater than that of the female spring 218, so that when the male member 1 is connected with the female member 2, the internal structure of the female member 2 is compressed and sealed.

In a preferred embodiment of the present invention, the front end of the male outer cylinder 118 is further provided with a buckle 123, the buckle 123 extends towards the center towards the outer end to form a tail hook, and the front end of the female outer cylinder 208 is provided with a conical annular inverted boss; when the male part 1 is in butt joint with the female part 2, the tail hook clamps the conical annular inverted boss and prevents the conical annular inverted boss from falling out. Further, the buckle 123 is in a stepped flat strip shape and is composed of two steps, a step plane of the long step end is provided with a through hole which is fixed on the front outer cylindrical surface of the male outer cylinder 118 by means of the male front bolt 121, a second step long plane section of the buckle 123 is extended downwards to the front cylindrical surface of the male outer cylinder 118 to dig three rectangular grooves in a trisection manner in the circumferential direction, and a tail end hook of the buckle 123 is a conical annular inverted boss for clamping the female outer cylinder 208. Preferably, the buckle 123 is made of titanium TA2. Further, the male outer cylinder 118 is cylindrical with two flanges, and the front flange, i.e. the limiting protrusion, is located at the position of the inner ring of the male outer cylinder 118 near the front end surface, so as to limit the forward displacement of the male front baffle 124, and the inner ring and the outer cylindrical surface of the male front baffle 124 form an axial sliding fit; the rear flange of the male outer cylinder 118 protrudes out of the original cylindrical surface, and is axially provided with 3 through holes, and is fixedly connected with the male rear baffle 107 through a male rear bolt 110; the male outer cylinder 118 is provided with 3 screw holes on the front outer cylinder surface, and the buckle 123 is fixed on the outer cylinder surface thereof by the male front bolt 121. The inner side of the buckle 123 at the front part of the male outer barrel 118 is provided with a large chamfer to assist the female part 2 to smoothly enter the inner cylindrical surface of the male part 1; three rectangular grooves are cut out in the circumferential direction of the cylindrical surface of the front part of the male outer barrel 118 in a trisection manner for placing the inner detection part of the buckle 123, and one more rectangular groove is cut out on the basis of the three rectangular grooves for guiding the conical annular inverted boss on the female outer barrel 208. Preferably, the male outer barrel 118 is made of polyetheretherketone.

In a preferred embodiment of the present invention, the male front baffle 124 is provided with a male core sheath 125 through which the male core member passes, the male core sheath 125 is formed into an integral structure by three cylinders with different diameters sequentially connected from inside to outside, wherein the smallest diameter of the three cylinders is provided for the male core member to pass through in a sealing manner and is matched with the front end of the female core member in size, the outer circumferential surface with the middle diameter is sealed with the male front baffle 124, the largest diameter is closely attached to the outer end surface of the female front baffle 205, and the outer edge thereof extends forward to form an insulation structure which can be sealed in a pressing manner at the corresponding position of the female front baffle 205.

In a preferred embodiment of the present invention, the male end backplate 107 is provided with oil filling holes for communicating the space inside the male end sheath 102 with the outside, preferably, the number of the oil filling holes is not less than two, and the oil filling holes can be blocked by the male end oil filling hole plugs 106 after the oil filling is completed. Further, the male end backplate 107 is axially provided with larger through holes, the number of which is consistent with that of the male end battery cells 127, 3 threaded holes are respectively formed around the round holes, the larger through holes are matched with the small-diameter outer cylindrical surfaces of the first wire supporting sleeve 104 and the second wire supporting sleeve 112, and the first wire supporting sleeve 104 and the second wire supporting sleeve 112 are fixed on the male end backplate 107 by the 3 threaded holes. Further, the male end rear baffle 107 is provided with smaller through circular holes for communicating oil in the male end sheath 102 and the outer compensator 115, and the number of the holes is not less than 2 between the outer compensator 115 and the inner compensator. Furthermore, around the larger through hole, the male end rear baffle 107 is further provided with a stepped through hole, i.e. a first channel, in the axial direction for installing the first check valve 105, so that oil can only flow from the interior of the male end sheath 102 to the interior of the micro bellows 117; the male end rear baffle 107 is provided with 4 threaded holes on one side end surface of the micro bellows 117 for installing and fixing the bellows 117. Furthermore, the end face of the male end rear baffle 107 close to one side of the corrugated pipe 117 is provided with 1 outer retainer ring, namely a male end outer retainer ring, the outer compensator 115 is fixed on the outer ring by means of the outer compensator locking belt one 109, and a V-shaped groove is engraved on the corresponding matching surface of the outer retainer ring to ensure that the outer compensator 115 cannot axially move. Further, the male end rear baffle 107 is provided with inner check rings inside the outer check rings on one side of the bellows 117, the number of the check rings is consistent with that of the male end battery cells 127, the inner compensator 116 is fixed on the outer ring of the male end rear baffle by means of the inner compensator locking belt one 111, and V-shaped grooves are engraved on corresponding matching surfaces of the inner check rings to ensure that the inner compensator 116 cannot axially move. Further, one end of the male rear baffle 107 is thermally fused with the large port of the male sheath 102, and the other end is provided with 3 threaded holes which are fixed with the rear flange of the male outer barrel 118 through the male rear bolt 110. Preferably, the male end tailgate 107 is made of polyetheretherketone.

Further, the first wire supporting sleeve 104 is divided into an inner part and an outer part, and is fixed and sealed on the male end rear baffle 107 through the second wire supporting sleeve bolt 113 and the first wire supporting sleeve bolt 103 respectively.

Further, the front baffle 124 of the male is disc-shaped, and a circular through hole is arranged in the center and is integrated with the sheath 125 of the male battery cell through thermal fusion; the rear side of the front baffle 124 is axially provided with 4 threaded holes for installing the corrugated pipe 117; the front side of the front baffle 124 of the male is contacted with the inner flange of the front part of the outer cylinder 118 of the male to serve as a stop; the male front baffle 124 is provided with 1 outer retainer ring on one side end surface of the corrugated pipe 117, the outer compensator 115 is fixed on the outer ring of the male front baffle by means of the outer compensator locking belt II 119, and V-shaped grooves are engraved on corresponding matching surfaces of the outer retainer ring to ensure that the outer compensator 115 cannot axially move; the male end rear baffle 107 is provided with inner check rings inside the outer check rings on one side of the micro bellows 117, the number of the check rings is consistent with that of the male end battery cells 127, the inner compensator 116 is fixed on the outer ring of the male end rear baffle by means of the second inner compensator locking belt 120, and V-shaped grooves are engraved on corresponding matching surfaces of the inner check rings to ensure that the outer compensator 116 cannot axially move. Preferably, the material used for the front male baffle 124 is polyetheretherketone.

The present invention will be further described with reference to the structural design of the underwater wet plug connector in the above embodiment.

Examples

An underwater wet plug connector comprises a male member 1 and a female member 2, wherein,

the male part 1 has a structure shown in fig. 1, and comprises a male wire 101, a male sheath 102, a first wire supporting sleeve bolt 103, a first wire supporting sleeve 104, a first check valve 105, a male oil hole plug 106, a male rear baffle 107, a first bellows seal 108, a first outer compensator locking strap 109, a male rear bolt 110, a first inner compensator locking strap 111, a second wire supporting sleeve 112, a second wire supporting sleeve bolt 113, a male spring 114, an outer compensator 115, an inner compensator 116, a bellows 117, a male outer cylinder 118, a second outer compensator locking strap 119, a second inner compensator locking strap 120, a male front bolt 121, a second bellows seal 122, a buckle 123, a male front baffle 124, a male core sheath 125, a second check valve 126 and a male core 127. The male sheath 102 is in hot melt adhesive connection with the male rear baffle 107, the one-way valve I105 is connected with the male rear baffle 107 in a threaded manner, the first wire supporting sleeve 104 and the second wire supporting sleeve 112 are respectively fixed on the male rear baffle 107 by the first wire supporting sleeve bolt 103 and the second wire supporting sleeve bolt 113, and the male wire 101 passes through central round holes of the first wire supporting sleeve 104 and the second wire supporting sleeve 112 and is welded with the male electric core 127; the front baffle 124 of the male, the sheath 125 of the male electric core, the second one-way valve 126 and the male electric core 127 are cast into a whole through hot melting; the male outer cylinder 118 is connected and fixed with the male rear baffle 107 through the male rear bolt 110, the inner cavity and the male front baffle 124 form sliding fit, a flange is arranged to limit the forward displacement of the male front baffle 124, the male spring 114 props up the male front baffle 124 and the male rear baffle 107, and the male outer cylinder 118 is connected with the buckle 123 through the male front bolt 121; the first outer compensator locking strap 109 and the second outer compensator locking strap 119 clamp the outer compensator 115 to the outer collars of the male front baffle 124 and the male rear baffle 107; the first inner compensator locking strap 111 and the second inner compensator locking strap 120 tighten the inner compensator 116 around the inner stops of the front and rear male stops 124, 107; the micro bellows 117, together with the first micro bellows seal 108 and the second micro bellows seal 122, are bolted to corresponding threaded holes in the front and rear male baffles 124 and 107, respectively. The space enclosed by the male sheath 102, the outer compensator 115 and the male front baffle 124 is filled with transformer oil.

The structure of the female part 2 is shown in figure 2, including a front-of-head cell sleeve 201, a front-of-head cell seat 202, a front-of-head cell seat inner seal 203, a front-of-head cell seat outer seal 204, a front-of-head baffle 205, a front-of-head cell 206, a front-of-head screw 207, a front-of-head outer cylinder 208, a front-of-head base inner radial seal 209, an external pressure compensation diaphragm locking strap 210, a middle pressure compensation diaphragm locking strap 211, a front-of-head base plug 212, a front-of-head cell support sleeve outer diameter seal 213, a front-of-head cell support sleeve 214, a front-of-head base 215, a front-of-head base plug 216, a front-of-head cell support sleeve inner diameter seal 217, a front-of-head spring 218, a front-head base axial inner seal 219, a front-of-head base axial outer seal 220 the female front-rear base connection bolt 221, the female front-rear base connection bolt seal 222, the middle pressure compensation diaphragm 223, the third micro check valve 224, the external pressure compensation diaphragm 225, the spring seat 226, the female rear base 227, the female rear base plug 228, the fourth micro check valve 229, the external pressure compensation diaphragm locking strap 230, the female rear locking bolt 231, the middle pressure compensation diaphragm locking strap 232, the female rear baffle radial plug 233, the female rear base seal 234, the female rear baffle axial plug 235, the female rear cell sleeve 236, the female rear baffle 237, the female rear cell seal 238, the female rear cell 239, the female sheath 240, and the female lead 241. The female front electric core sleeve 201 and the female front electric core 206 are bonded into a whole through hot melting, the female front electric core sleeve 201 and the female front electric core seat inner sealing piece 203 form sealing sliding fit with the inner hole of the female front electric core seat 202, and the female front electric core seat 202 and the female front electric core seat outer sealing piece 204 form sealing fit with the corresponding inner hole of the female front baffle 205 and are fixed through a screw pair; spring seat 226 and female back cell cover 236 and female back cell 239 are fused into a whole, female back cell cover 236 and female back cell sealing member 238 are connected and fixed with female back baffle 237 through screw thread pair, female back cell 239 is connected with female lead 241 through welding mode; the female end rear baffle 237 and the female end sheath 240 are adhered into a whole in a hot melting mode, and the radial plug 233 of the female end rear baffle and the axial plug 235 of the female end rear baffle are fixed on the radial circumferential surface and the axial rear end surface of the female end rear baffle 237 in a screw pair mode; the outer diameter sealing piece 213 of the cell support sleeve before the mother head and the inner diameter sealing piece 217 of the cell support sleeve before the mother head are arranged in the outer and inner grooves of the cell support sleeve 214 before the mother head, then the inner ring of the cell support sleeve 214 before the mother head and the cell sleeve 201 before the mother head form sliding sealing fit, and the outer ring and the inner ring of the retainer ring in the baffle 205 before the mother head form sealing fit; the first female front base plug 212 and the second female front base plug 216 are connected and installed on the radial circumferential surface of the female front base 215 through screw thread pairs, one end of the micro check valve III 224 is inserted into a corresponding round hole at the rear part of the female front base 215, the radial sealing piece 209 in the female front base, the axial inner sealing piece 219 in the female front base and the axial outer sealing piece 220 in the female front base 215 are respectively installed in radial and axial inner and outer grooves in the female front base 215, the inner hole at the front part of the female front base 215 is sleeved outside the inner retainer ring of the female front baffle 205, and the female front cell support sleeve 214 is pressed at the end part of the inner retainer ring of the female front baffle 205; the back base plug 228 and the fourth micro check valve 229 are fixed on the radial circumferential surface of the back base 227 through screw thread pairs, the back base sealing member 234 is arranged in the axial groove at the back part of the back base 227, the back base 227 is fixed on the back baffle 237 after the back base connecting bolt 222 is additionally arranged on the back base connecting bolt 221, the front base 215 and the back base 227 are connected into a whole, the front base 215 and the back base 227 are sealed through the front base axial inner sealing member 219 and the front base axial outer sealing member 220, and the other end of the third micro check valve 224 is inserted into the corresponding round hole at the front part of the back base 227; the female spring 218 is disposed between the female front cell 206 and the spring seat 226; the first external pressure compensation diaphragm locking strap 210 and the second external pressure compensation diaphragm locking strap 230 compress the external pressure compensation diaphragm 225 against the external retainers of the front bus bar 205 and the back bus bar 237, and the first middle pressure compensation diaphragm locking strap 211 and the second middle pressure compensation diaphragm locking strap 232 compress the middle pressure compensation diaphragm 223 against the middle retainers of the front bus bar 205 and the back bus bar 237; the female outer cylinder 208 fixes the female front bezel 205 and the female rear bezel 237 by the female front screw 207 and the female rear lock bolt 231, respectively. The area enclosed by the front baffle 205, the external pressure compensating diaphragm 225 and the front sheath 240 is filled with transformer oil.

Fig. 3 is a schematic view of an axial oil discharging structure of a female connector of an underwater wet plug connector, which is a front end surface structure of a front electric core seat 202 of the female connector, and the grooves 242 on the front end surface are used for helping the oil flowing through the second micro check valve 126 to pass smoothly, so as to remove the water between the front end surface of the front electric core seat 202 of the female connector and the corresponding joint surface of the male electric core sheath 125.

Fig. 4 shows the position and connection relationship of the components when the underwater wet plug connector reliably establishes an electrical connection between the male conductor 101 and the female conductor 241 in an underwater environment.

Fig. 5 is a schematic view of a partial structure of the connection state of the underwater wet plug connector, showing the state and relationship of each main component in the connection state. It can be seen that the electrical connection between the male wire 101 and the female wire 241 is established, in fact, by the electrical connection between the female front cell 206 and the female rear cell 239, the male cell 127 pushes the female front cell 206 to retreat until the female front cell 206 is in contact with the female rear cell 239, and at this time, the conductive state between the male wire 101 and the female wire 241 is maintained by the snap 123 being clamped with the conical flange at the front of the female outer barrel 208.

Fig. 6 is a flow chart of insulating oil. The flow direction of the internal insulating oil when the male member 1 is inserted into the female member 2 is depicted.

The underwater wet plugging connector of the embodiment utilizes unidirectional flow control of insulating oil to ensure that the insulating length is increased as much as possible, and simultaneously, multiple protection is carried out on an electric on-off area to ensure that insulation between the electric cores and a water body is not reduced. The working process is divided into two stages: the insertion phase and the extraction phase are described with reference to fig. 6 as follows:

the inserting stage: when the male head of the underwater wet plug connector moves along the direction of arrow nine 24, the male head spring 114 is very stiff, and the male head front baffle 124 is initially stationary, so that the male head electric core 127 pushes the female head front electric core 206 to move along the plugging direction (i.e. the direction of arrow nine 24), at this time, because the clearance between the outer cylindrical surface at the rear of the female head front electric core 206 and the inner cylindrical surface of the female head front base 215 and the female head rear base 227 is small, the oil pressure in the space six 22 (i.e. the second half section of the installation cavity) of the insulating oil is increased, and then the insulating oil in the inner part of the insulating oil enters the buffer cavity (i.e. the space three 16) along the channel three (i.e. sequentially along the directions of arrow nine 25, arrow six 21, arrow four 17 and arrow three 15), so that the oil pressure in the buffer cavity is increased, and the external water cannot enter the buffer cavity through the joint surface of the outer cylindrical surface of the female head front electric core 201 and the inner cylindrical surface of the female head front electric core base 202 is ensured. Meanwhile, the oil between the middle pressure compensation diaphragm 223 and the female head base (i.e., space five 20) enters the space four 19 between the female head front battery cell 206 and the front half section of the installation cavity along the direction of arrow five 18 through the hole, thereby preventing negative pressure from affecting connection. When the male member 1 is inserted into the subsequent stage, the front end surface of the female front electric core seat 202 and the male electric core sheath 125 form virtual contact, the front end flange of the male electric core sheath 125 and the like start to deform, water is trapped in the oil drain groove of the joint surface between the front end surface of the female front electric core seat 202 and the male electric core sheath 125, and when the male member 1 continues to move towards the plugging direction, the front end of the female outer cylinder 208 butts against the male front baffle 124, so that the male front baffle 124 moves reversely along the plugging direction, at this time, because the corrugated tube 117 is approximately rigid in the radial direction, axial compression inevitably causes insulating oil to flow to the outside from the space I11 in the corrugated tube 117 along the channel II (namely along the directions of the arrow I13 and the arrow II 14), which eliminates the water trapped at the joint surface between the front end surface of the female front electric core seat 202 and the male electric core sheath 125, and increases the insulating safety distance. At the same time, the rear large cylindrical hole of the female front cell 206 is in contact conduction with the large cylindrical surface of the female rear cell 239, and at this time, the conduction state between the male wire 101 and the female wire 241 is maintained by the clamping position of the buckle 123 and the front conical flange of the female outer barrel 208.

The extraction stage: when the male member 1 moves reversely along the plugging direction, the water is prevented from passing through and entering the space one 11 in the bellows 117 due to the second check valve 126, and the insulating oil in the space two 12 between the bellows 117 and the inner compensator 116 is sucked into the space one 11 in the bellows 117 due to the extension action of the male spring 114, so that the oil liquid amount in the space one 11 is not reduced when the male member is reinserted next time. Meanwhile, when the female front electric core 206 is pulled out, the female head spring 218 pushes the female front electric core 206 to move reversely along the arrow eight 24, the space five 20 supplements oil to the space six 22 along the arrow seven 23 to prevent negative pressure from being formed to reduce the moving speed of the female front electric core 206, and the pressure of the space three 16 is not reduced, so that external water cannot enter the space three 16 through the joint surface of the outer cylindrical surface of the female front electric core seat 202 of the female front electric core sleeve 201.

The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.

Claims (8)

1. An underwater wet plug connector, comprising:

male part: the device comprises a male outer barrel with front and rear openings, a male rear baffle fixedly sealing the rear end of the male outer barrel, a male front baffle which is arranged on the inner side of the front end of the male outer barrel in a sealing way and can move along the inner wall of the male outer barrel, a male sheath which is arranged on the male rear baffle in a sealing way, a male spring with two ends respectively abutting against the male front baffle and the male rear baffle and moving towards the front end of the male outer barrel, and a male electric core piece which sequentially passes through the male rear baffle and the male front baffle in a sealing way, wherein a limiting bulge limiting the outward moving distance of the male front baffle is arranged on the inner side of the front end of the male outer barrel, a corrugated pipe and a compensator which are sequentially sealed and enclose the male electric core piece from inside to outside are arranged between the male front baffle and the male rear baffle, the male sheath, the compensator and the male front baffle enclose a communication space filled with insulating oil, a first channel which is communicated with the corrugated pipe and the male sheath and is communicated with the corrugated pipe in a unidirectional way, and a second channel which is communicated with the front side of the male electric core piece is arranged between the corrugated pipe and the male electric core piece and the front baffle;

Female head piece: comprises a female outer cylinder with front and rear openings, a female front baffle and a female rear baffle which respectively fix and seal the front and rear ends of the female outer cylinder, a female base with the front and rear ends respectively in sealing contact with the front baffle and the rear baffle, a female sheath which is arranged on the rear baffle in a sealing way, and a female core element which sequentially penetrates through the rear baffle, the base and the front baffle, a pressure compensation diaphragm surrounding the mother head base is also arranged between the mother head front baffle and the mother head rear baffle, a buffer cavity is formed between the front end of the mother head base and the mother head front baffle around the mother head electric core piece, a mounting cavity for mounting the mother head electric core piece is processed inside the mother head base, the female head cell piece comprises a female head front cell, a female head rear cell and a female head spring, wherein the two ends of the female head spring are respectively connected with the female head front cell, the bottom of the female head front cell is in sliding seal with the mounting cavity, the head sequentially passes through a female head base, a buffer cavity and a female head front baffle, the female head rear cell is fixedly arranged, the outer side surface of the female head rear cell is provided with a gap with the inner wall of the buffer cavity, a channel III which is communicated with the rear section of the female head cavity and the buffer cavity and is conducted in a unidirectional way towards the direction of the buffer cavity is also arranged in the female head base, the front end of the female head cavity is communicated with the pressure compensation diaphragm, the rear section of the female head cavity and the pressure compensation diaphragm form a cavity which is conducted in a unidirectional way towards the female head cavity, the inner space of the area surrounded by the female head sheath, the female head front baffle and the pressure compensation diaphragm is filled with insulating oil, and the space between the female head sheath and the pressure compensation diaphragm is communicated;

The female head front cell is of a two-section integrated cylindrical structure, wherein a front cell sleeve is sleeved on a small-diameter section and penetrates through the front end of the female head base and the female head front baffle in a sealing manner, the head of the small-diameter section is recessed in the front cell sleeve, a butt joint hole matched with the head of the male head cell piece is formed, and a large-diameter section is positioned in the mounting cavity and is sealed with the inner wall of the mounting cavity in a sliding manner;

the pressure compensation diaphragm comprises a middle pressure compensation diaphragm and an outer pressure compensation diaphragm which are sequentially surrounded by the mother head base at intervals, and a channel for communicating the outer pressure compensation diaphragm with the mother head sheath is arranged in the area between the outer pressure compensation diaphragm and the middle pressure compensation diaphragm of the mother head rear baffle;

the compensator comprises an inner compensator and an outer compensator which are sequentially arranged at intervals and enclose the corrugated pipe, and a channel which is used for communicating the outer compensator with the male head sheath is arranged in the area between the outer compensator and the inner compensator on the male head rear baffle.

2. The underwater wet plug connector of claim 1, wherein the bottom of the large diameter section of the front female die is further hollowed out to form a recess for receiving the female spring.

3. The underwater wet plug connector of claim 1, wherein the female front baffle and the female rear baffle are respectively and oppositely provided with a female outer retainer ring and a female middle retainer ring, and the outer pressure compensation diaphragm and the middle pressure compensation diaphragm are respectively and hermetically fixed outside the female outer retainer ring and the female middle retainer ring through an outer diaphragm locking belt and a middle diaphragm locking belt;

the male front baffle and the male rear baffle are respectively and oppositely provided with a male outer check ring and a male inner check ring, and the outer compensator and the inner compensator are respectively and tightly locked on the outer sides of the male outer check ring and the male inner check ring through an outer locking belt and an inner locking belt.

4. The underwater wet plug connector according to claim 3, wherein the inner sides of the two ends of the external pressure compensation diaphragm and the middle pressure compensation diaphragm are respectively provided with inverted-V-shaped bulges, and the inverted-V-shaped bulges are respectively fitted and clung to the corresponding parts of the female outer check ring and the female middle check ring.

5. The underwater wet plug connector of claim 1, wherein the female base comprises a female front base and a female rear base which are connected in a sealing manner by a base connecting bolt, wherein the front end of the female front base is connected in a sealing manner with a female inner retainer ring arranged in the middle of a female front baffle by a supporting sleeve, the buffer cavity is formed, and the bottom end face of the female rear base is fixed and sealed with the female rear baffle.

6. The underwater wet plug connector of claim 1, wherein the male and female springs are always in a compressed state and the male spring has a higher stiffness than the female spring.

7. The underwater wet plug connector as defined in claim 1, wherein the front end of the male outer cylinder is further provided with a buckle, the buckle extends towards the center towards the outer end to form a tail hook, and the front end of the female outer cylinder is provided with a conical annular inverted boss;

when the male head piece is in butt joint with the female head piece, the tail hook clamps the conical annular inverted boss and prevents the conical annular inverted boss from falling out.

8. The underwater wet plug connector according to claim 1, wherein the female front baffle is provided with a female front electric core seat for the female front electric core piece to pass through, the front end of the female front electric core seat protrudes out of the female front baffle and is sealed and clung to the front end face of the female front baffle, and guide grooves are further distributed on the front end face of the female front electric core seat along the radial direction;

the male electric core sheath is formed by three sections of cylinders with different diameters which are sequentially connected from inside to outside, wherein the section with the smallest diameter in the three sections of cylinders is used for the male electric core member to pass through in a sealing manner and is matched with the front end of the female electric core member in size, the outer circumferential surface of the section with the middle diameter is sealed with the male front baffle, the section with the largest diameter is tightly attached to the outer side end surface of the female front baffle, and the outer edge of the outer circumferential surface extends forwards to form an annular groove-shaped structure which can be sealed with the protruding part of the female front electric core seat on the female front baffle in an extruding manner.

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