CN102168536B - Underwater double-unlocking connector - Google Patents

Abstract

The invention relates to an underwater double unlocking connector, which comprises a through tubular body, an outer wall tube sleeved on the outside of the main body, an annular horn body arranged at the bottom end of the outer wall tube, and an annular horn body connected to the annular horn body. The upper locking ring, the piston cylinder slidably arranged between the main body and the outer wall cylinder, and the mechanical unlocking sleeve slidably sleeved on the outer upper part of the outer wall cylinder. The underwater double-unlocking connector of the present invention adopts hydraulic and mechanical double-unlocking methods, which can realize accurate, efficient and reliable locking and unlocking with the underwater wellhead or hub seat, and has high reliability and offshore operation efficiency. The rack and pinion mechanical locking mode used in the present invention has simple structure, convenient operation, safety and reliability.

Description

Underwater Dual Unlock Connector

technical field

The invention relates to a connector used for connecting top tension risers and other rigid pipelines with underwater wellheads or hubs in the field of offshore oil engineering, in particular to an underwater double unlocking connector.

Background technique

In the field of offshore oil, various pipelines and risers are the guarantee for the transportation of oil and gas resources; with the increasing working water depth, how to realize the safety, reliability and rapid , Convenient connection is one of the important technologies to realize the reliable transportation of oil and gas resources.

With the vigorous development of offshore oil technology, the operating water depth continues to increase, and there are more and more factors that are not conducive to installation such as underwater pressure and temperature. The installation cost and cost are also increasing rapidly, and the reliability requirements for connectors are also getting higher and higher. How to quickly, safely and reliably realize the connection process, and how to effectively realize the locking and unlocking process of the connector within the design period is the key to the design of deep-water connectors. At present, most of the existing underwater connectors are driven by a single hydraulic or mechanical drive, which cannot guarantee a completely reliable connection process and cannot fully meet the challenges of the above problems.

In view of this, the inventor proposes an underwater double unlocking connector to overcome the defects of the prior art by virtue of years of relevant design and manufacturing experience.

Contents of the invention

The purpose of the present invention is to provide an underwater double unlocking connector, which is a double unlocking connector with hydraulic and mechanical unlocking methods, which can realize accurate, efficient and reliable locking and locking with the underwater wellhead. unlock.

Another object of the present invention is to provide an underwater double unlocking connector, which has a simple structure and is easy to operate, and can be applied to the connection between the top tension riser and the wellhead, the rigid pipeline and the hub seat, and has high reliability and offshore efficiency.

The purpose of the present invention is achieved in this way, an underwater double unlocking connector, which includes:

A through tubular main body, the top end of which forms the interface connected with the pipeline, and the first radial boss and the second radial boss are formed sequentially from top to bottom on the lower side of the interface, the diameter of the first radial boss is larger than The diameter of the second radial boss; the first radial boss is provided with a first through hole and a second through hole axially through;

An outer wall tube is sleeved on the outside of the main body, and the top of the outer wall tube is fixedly connected with the circumferential side wall of the first radial boss; the upper part of the outer wall tube is provided with a plurality of longitudinally arranged oblong positioning holes, The plurality of positioning holes are evenly arranged around the circumference of the outer wall cylinder;

An annular horn body is arranged at the bottom end of the outer wall cylinder. The annular horn body is composed of an upper annular plane and a bell mouth connected below the annular plane and gradually expanding downward. The annular plane is fixedly connected to the bottom end of the outer wall cylinder;

A locking ring, connected to the annular plane of the annular horn body, the locking ring is composed of two arc-shaped bearing bushes and a compression spring connected between the two bearing bushes; the inner wall of the bearing bush is arranged along the circumferential direction. There are multiple card slots; the outer wall of the bearing bush forms a tapered surface of the locking ring that expands radially from top to bottom;

A piston cylinder is slidably arranged between the main body and the outer wall cylinder. The inner wall of the piston cylinder is provided with a radial inner boss. The inner boss is in close contact with and slides on the outer wall of the main body. The piston cylinder on the upper side of the inner boss The inner wall is slidably arranged on the outside of the second radial boss of the main body; a sealing ring is fixed on the outer wall of the main body and below the inner boss of the piston barrel, and the outer side of the sealing ring is sealed with the inner wall of the piston barrel under the inner boss. Sliding contact; the first hydraulic chamber is formed between the second radial boss and the inner boss of the piston barrel, and the second hydraulic chamber is formed between the inner boss of the piston barrel and the sealing ring; the wall of the piston barrel A first hydraulic channel connected to the first hydraulic chamber and a second hydraulic channel connected to the second hydraulic chamber are respectively provided; a first hydraulic pipeline passes through the first through hole of the main body and communicates with the first hydraulic channel. Hydraulic channel; a second hydraulic pipeline communicates with the second hydraulic channel through the second through hole of the main body;

A mechanical unlocking sleeve, which is slidably sleeved on the outer upper part of the outer wall tube. The unlocking sleeve is respectively provided with a perforation corresponding to a plurality of oblong positioning holes on the outer wall tube, and a screw passes through the through hole and the corresponding The positioning hole is connected with the piston cylinder.

In a preferred embodiment of the present invention, the outer wall cylinder is provided with a shaft hole, one end of a gear is provided with a gear shaft, and the center of the other end is provided with an inner hexagonal groove, and the gear shaft is located in the shaft hole; The unlocking sleeve is provided with a longitudinal through groove, the side of the longitudinal through groove is provided with a rack installation part, and a rack is arranged on the rack installation part, and the rack is meshed with the gear.

In a preferred embodiment of the present invention, a plurality of longitudinally arranged guide strips are evenly distributed on the circumference of the outer wall cylinder, and U-shaped guide grooves corresponding to the guide strips are provided on the unlocking sleeve.

In a preferred embodiment of the present invention, an annular assembly groove is provided on the lower part of the outer wall of the main body and on the lower side of the sealing ring, and a plurality of arc-shaped support blocks are assembled in the annular assembly groove, and the support blocks protrude On the outer wall of the main body, the bottom of the sealing ring is against the top of the support block; an annular support leg is arranged between the piston barrel and the main body, the upper end of the annular support leg is against the bottom of the support block, and the lower end of the annular support leg is against the bottom of the support block. top of the locking ring.

In a preferred embodiment of the present invention, the inner wall of the lower end of the annular support leg is upwardly provided with a sinking groove, and the bottom surface of the sinking groove is located below the bottom end of the main body.

In a preferred embodiment of the present invention, the outer wall of the annular support leg is provided with a tapered surface that gradually expands radially from top to bottom, and the inner wall of the piston barrel is provided with a positioning corresponding to the tapered surface. tapered surface.

In a preferred embodiment of the present invention, the inner wall of the bottom end of the piston cylinder is provided with a driving tapered surface corresponding to the tapered surface of the locking ring.

In a preferred embodiment of the present invention, a sealing ring assembly is provided at the bottom end of the main body.

In a preferred embodiment of the present invention, two slide grooves are radially symmetrically arranged on the circular plane of the circular horn body, and a guide slider is provided at the bottom of the bearing bush, and each guide slider slides separately. Set in the corresponding chute.

From the above, the underwater double unlocking connector of the present invention adopts hydraulic and mechanical double unlocking methods, which can realize accurate, efficient and reliable locking and unlocking with the underwater wellhead, and has high reliability and offshore operation. efficiency. The bell mouth is set at the bottom of the outer wall cylinder, which can make the positioning of the connector fast, simple, stable and reliable; the positioning face is set to limit the piston cylinder, which can effectively prevent the hydraulic pusher from overloading and avoid damage to the underwater hub and connector , improve the service life; adopt hydraulic system drive, shorten the time of locking and unlocking between the connector and the connected parts, and improve the reliability of underwater connection; set the mechanical unlocking sleeve, further improve the underwater connection safety; the designed locking ring adopts the structure of the spring-driven semi-circular bearing bush, which is novel and unique, and compared with the C-shaped ring spring steel structure, it is easier to realize in processing and manufacturing, and has a better locking effect; in addition, the present invention The rack and pinion mechanical locking method used has simple structure, convenient operation, safety and reliability.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in:

Figure 1: It is a three-dimensional structural schematic diagram of the underwater double unlocking connector of the present invention.

Figure 2: Schematic diagram 1 of the cross-sectional structure of the underwater double unlocking connector of the present invention.

Fig. 3: Schematic diagram 2 of the cross-sectional structure of the underwater double unlocking connector of the present invention.

Fig. 4: is the schematic diagram of the main body structure in the present invention.

Fig. 5 is a schematic diagram of the structure of the outer wall cylinder in the present invention.

Fig. 6 is a schematic diagram of the structure of the circular horn body in the present invention.

Fig. 7: It is a schematic diagram of the structure of the locking ring in the present invention.

Fig. 8: Schematic diagram 1 of the assembly structure of the locking ring and the annular horn body in the present invention.

Fig. 9: Schematic diagram 2 of the assembly structure of the locking ring and the annular horn body in the present invention.

Fig. 10 is a schematic diagram of the sectional structure of the piston cylinder in the present invention.

Fig. 11 is a schematic diagram of the three-dimensional structure of the piston cylinder in the present invention.

Fig. 12: Schematic diagram of the structure of the mechanical unlocking sleeve in the present invention.

Figure 13: It is a schematic diagram of the rack and pinion structure in the mechanical unlocking sleeve.

Fig. 14 is a schematic diagram of the three-dimensional structure of the support block in the present invention.

Fig. 15 is a schematic diagram of the three-dimensional structure of the supporting legs in the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention proposes an underwater double unlocking connector 100, which includes:

A through tubular main body 1, as shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the top end of the main body 1 constitutes the interface 11 connected with the pipeline, and the first radial protrusion is formed sequentially from top to bottom on the lower side of the interface 11. platform 12 and a second radial boss 13, the diameter of the first radial boss 12 is greater than the diameter of the second radial boss 13; the first radial boss 12 is provided with the first axially through A through hole 121 and a second through hole 122;

An outer wall tube 2 (as shown in Figure 5 ), sleeved on the outside of the main body 1, the top of the outer wall tube 2 is fixedly connected to the circumferential side wall of the first radial boss 12, in this embodiment, the outer wall tube 2 and the circumferential side wall of the first radial boss 12 are connected by a plurality of high-strength bolts; the upper part of the outer wall tube 2 is provided with a plurality of longitudinally arranged oblong positioning holes 21, and the plurality of positioning holes 21 are evenly arranged around the outer wall cylinder 2 in the circumferential direction;

An annular horn body 3 (as shown in Figure 6), is arranged on the bottom end of outer wall cylinder 2, and this annular horn body 3 is connected below this annular plane by the annular plane 31 of top and The lower flared bell mouth 32 is formed, and the annular plane 31 is fixedly connected to the bottom end of the outer wall tube 2. In this embodiment, the annular plane 31 and the bottom end of the outer wall tube 2 are connected by a plurality of screws. of;

A locking ring 4 (shown in Fig. 7, Fig. 8 and Fig. 9), is connected on the annular plane 31 of the annular horn body, and the locking ring 4 is formed by two arc-shaped bearing bushes 41 correspondingly arranged and the compression spring 42 connected between the two bearing pads. In this embodiment, two compression springs are respectively provided at each joint, and a total of four compression springs are provided; the inner wall of the bearing pad 41 is provided with a plurality of card slots along the circumferential direction 411; the outer wall of the bearing bush 41 forms a locking ring tapered surface 412 that gradually expands from the upper to the lower radial dimension;

A piston barrel 5 (as shown in Figures 10 and 11) is slidably arranged between the main body 1 and the outer wall barrel 2, and the inner wall of the piston barrel 5 is provided with a radially inner boss 51, which closely contacts and Slidingly arranged on the outer wall of the main body 1, the inner wall of the piston barrel on the upper side of the inner boss 51 is slidably arranged outside the second radial boss 13 of the main body; on the outer wall of the main body 1 and below the inner boss 51 of the piston barrel 5 A sealing ring 6 is fixedly arranged, and the outer side of the sealing ring 6 is in sealing and sliding contact with the inner wall of the piston barrel 5 on the lower side of the inner boss 51; The hydraulic chamber A, the second hydraulic chamber B is formed between the inner boss 51 of the piston cylinder and the sealing ring 6; the cylinder wall of the piston cylinder 5 is respectively provided with a first hydraulic channel 52 that communicates with the first hydraulic chamber A , and the second hydraulic passage 53 that communicates with the second hydraulic chamber B; a first hydraulic pipeline 54 passes through the first through hole 121 of the main body and communicates with the first hydraulic passage 52; a second hydraulic pipeline 55 The second through hole 122 passing through the main body communicates with the second hydraulic passage 53;

A mechanical unlocking sleeve 7 (as shown in FIG. 12 ), which is slidably sleeved on the outer upper part of the outer wall tube 2, and the unlocking sleeve 7 is respectively provided with a plurality of oblong positioning holes 21 corresponding to the outer wall tube 2. There is a through hole 71 (as shown in FIG. 3 ), through which a screw 72 passes through the through hole 71 and the corresponding positioning hole 21 to connect with the threaded hole 56 on the piston cylinder (as shown in FIG. 11 ).

As shown in Figures 1 and 2, when in use, the double unlocking connector 100 is lowered above the wellhead 10 through an engineering ship or a floating platform (a clasp corresponding to the locking groove of the locking ring 4 is provided on the outside of the top of the wellhead 10) First, the bell mouth 32 of the double unlocking connector 100 is roughly aligned with the wellhead 10 , and after the wellhead 10 passes through the bell mouth 9 , the double unlocking connector is placed on the wellhead 10 as a whole. At this time, as shown on the left side of Figure 2, the first hydraulic chamber A is in the state of the smallest space, the second hydraulic chamber B is in the state of the largest space, and the piston cylinder 5 is at the upper position; open state.

With the assistance of underwater ROV, hydraulic oil is injected into the first hydraulic chamber A through the first hydraulic pipeline 54, so that the piston cylinder 5 moves downward in the axial direction relative to the main body 1, and is driven by the driving cone surface 58 on the piston cylinder 5. The conical surface 412 of the locking ring on the locking ring 5 makes the locking ring 4 shrink radially, and then locks the wellhead 10 (as shown on the right side of Fig. 2 ), at this moment, the first hydraulic chamber A is in the state of maximum space , the second hydraulic chamber B is in the state of minimum space.

When the double unlocking connector needs to be removed from the wellhead 10, the ROV is also used to inject hydraulic oil into the second hydraulic chamber B through the first hydraulic pipeline 55 until the second hydraulic chamber B is in the maximum space designed by itself. Make the piston barrel 5 move axially upwards relative to the main body 1. At this time, the bottom end of the piston barrel 5 no longer pushes the locking ring tapered surface 412 of the locking ring 4, and the locking ring 4 will The bearing bush 41 is in a loose state, so that the double unlocking connector can be smoothly removed from the wellhead 10 (as shown on the left side of FIG. 2 ), and the remaining details of the hydraulic unlocking are the inverse process of the hydraulic locking.

When the hydraulic circuit fails or there is no hydraulic power source, the process of locking and unlocking can be realized through the mechanical unlocking sleeve 7 . As shown in Figure 2, the mechanical unlocking sleeve 7 is slidably sleeved on the outer upper part of the outer wall tube 2, and the unlocking sleeve 7 is respectively provided with a perforation 71 corresponding to the plurality of oblong positioning holes 21 on the outer wall tube 2. , the screw 72 passes through the perforation 71 and the corresponding positioning hole 21 to connect with the threaded hole 56 on the piston cylinder; thus, the synchronous design of the mechanical unlocking sleeve 7 and the piston cylinder 5 is formed, and the manual movement is made up and down The mechanical unlocking sleeve 7 can drive the piston barrel 5 to move up and down axially synchronously, and then drive the locking ring 4 to complete the action of locking and releasing the wellhead.

From the above, the underwater double unlocking connector of the present invention adopts hydraulic and mechanical double unlocking methods, which can realize accurate, efficient and reliable locking and unlocking with the underwater wellhead, and has high reliability and offshore operation. efficiency.

Further, in order to facilitate the locking and unlocking of the connector by manual operation, in this embodiment, as shown in Figure 1, Figure 5, Figure 12, and Figure 13, the outer wall cylinder 2 is provided with a shaft hole 23, a gear 24 One end of one end is provided with a gear shaft, and the center of the other end is provided with an inner hexagonal groove, and the gear shaft is arranged in the shaft hole 23; the unlocking sleeve 7 is provided with a longitudinal through groove 73, and the side of the longitudinal through groove 73 A rack installation part 731 is provided on the side, and a rack 74 is arranged on the rack installation part, and the rack 74 is meshed with the gear 24; in this way, the wrench can be clamped in the groove of the gear, and the gear 24 can be rotated. The unlocking sleeve 7 is axially moved up and down through rack transmission. Two sets of said rack and pinion transmission mechanisms can be arranged symmetrically.

In this embodiment, as shown in FIG. 1 , FIG. 5 and FIG. 12 , a plurality of guide strips 22 arranged longitudinally are evenly distributed around the outer wall tube 2 , and the unlocking sleeve 7 is provided with a guide strip corresponding to the guide strips 22 . The U-shaped guide groove 75 is provided; thus, when the unlocking sleeve 7 moves up and down, it can have a better moving effect.

In this embodiment, an annular assembly groove 14 is provided on the lower part of the outer wall of the main body 1 and on the lower side of the sealing ring 6. As shown in FIG. The support block 8 is protruded on the outer wall of the main body 1, and the bottom of the sealing ring 6 is against the top of the support block 8; as shown in Figure 15, an annular support leg 9 is arranged between the piston barrel 5 and the main body 1, and the The upper end of the support leg 9 abuts against the bottom of the support block 8 , and the lower end of the annular support leg 9 abuts against the top of the locking ring 4 .

In this embodiment, the inner wall of the lower end of the annular support leg 9 is upwardly provided with a sinking groove 91, so that when the connector is docked with the wellhead 10, the top of the wellhead 10 can lean against the sinking groove 91; the sinking groove 91 The bottom surface is located below the bottom end of the main body 1 . The bottom end of the main body 1 is provided with a sealing ring assembly 15 to ensure a better sealing effect at the connecting parts.

In this embodiment, the inner wall of the bottom end of the piston cylinder 5 is provided with a driving cone surface 58 corresponding to the locking ring cone surface 412; when the piston cylinder 5 moves downward, the driving cone surface 58 on the piston cylinder 5 The conical surface 412 of the locking ring can be driven to make the two bearing bushes 41 shrink radially, thereby locking the connected wellhead 10 .

In this embodiment, the outer wall of the annular support leg 9 is provided with a tapered surface 92 that gradually expands radially from top to bottom, and the inner wall of the piston barrel 5 is provided with a positioning tapered surface corresponding to the tapered surface 92. 57 (as shown in Figure 10); when the driving taper surface 58 on the piston barrel 5 descends axially along the locking ring taper surface 412, until the positioning taper surface 57 on the piston barrel 5 touches the taper on the support leg 9 Up to the surface 92, it plays a positioning role.

In this embodiment, as shown in Fig. 6 and Fig. 9, two slide grooves 311 are arranged radially symmetrically on the annular plane 31 of the annular horn body, and a guide slider is arranged at the bottom of the bearing bush 41 411 , each guide slider 411 is slidably disposed in the corresponding slide groove 311 . Thus, it is ensured that when the bottom of the piston cylinder 5 drives the locking ring 4 to move, the locking ring 4 is guided by the slider 411 to limit the movement direction, so that the bearing bush 41 of the locking ring 4 can only radially compress the spring 42, thereby locking the wellhead 10. tight.

In addition, the function of the unlocking sleeve groove 76 on the mechanical locking sleeve 7 is to reserve a space for the high-strength bolt cap connecting the main body 1 and the outer wall cylinder 2, and has a certain axial guiding effect.

The design of the screw connection between the annular horn body 3 and the outer wall tube 2 reduces the difficulty of assembly; in addition, the design of the rib plate 321 on the bell mouth 32 reduces the weight of the bell mouth and enhances the guiding and centering ability.

The underwater double unlocking connector of the present invention is equipped with a bell mouth at the bottom of the outer wall cylinder, which can make the positioning of the connector fast, simple, stable and reliable; setting the positioning face to limit the position of the piston cylinder can effectively prevent the hydraulic pusher from overloading and avoid causing The damage to the underwater wellhead connector improves the service life; it is driven by a hydraulic system, which shortens the locking and unlocking time between the connector and the connected part, and improves the reliability of the underwater connection; a mechanical unlocking sleeve is provided Cylinder, which further improves the safety of the underwater connection; the designed locking ring adopts the structure of the spring-driven semi-circular bearing bush, which is novel and unique in form, and compared with the C-ring spring steel structure, it is easier to realize and has better Locking effect; in addition, the rack and pinion mechanical locking method used in the present invention has simple structure, convenient operation, safety and reliability.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (9)

1. An underwater double unlocking connector, characterized in that: the connector includes: A through tubular main body, the top end of which forms the interface connected with the pipeline, and the first radial boss and the second radial boss are formed sequentially from top to bottom on the lower side of the interface, the diameter of the first radial boss is larger than The diameter of the second radial boss; the first radial boss is provided with a first through hole and a second through hole axially through; An outer wall tube is sleeved on the outside of the main body, and the top of the outer wall tube is fixedly connected with the circumferential side wall of the first radial boss; the upper part of the outer wall tube is provided with a plurality of longitudinally arranged oblong positioning holes, The plurality of positioning holes are evenly arranged around the circumference of the outer wall cylinder; An annular horn body is arranged at the bottom end of the outer wall cylinder. The annular horn body is composed of an upper annular plane and a bell mouth connected below the annular plane and gradually expanding downward. The annular plane is fixedly connected to the bottom end of the outer wall cylinder; A locking ring, connected to the annular plane of the annular horn body, the locking ring is composed of two arc-shaped bearing bushes and a compression spring connected between the two bearing bushes; the inner wall of the bearing bush is arranged along the circumferential direction. There are multiple card slots; the outer wall of the bearing bush forms a tapered surface of the locking ring that expands radially from top to bottom; A piston cylinder is slidably arranged between the main body and the outer wall cylinder. The inner wall of the piston cylinder is provided with a radial inner boss. The inner boss is in close contact with and slides on the outer wall of the main body. The piston cylinder on the upper side of the inner boss The inner wall is slidably arranged on the outside of the second radial boss of the main body; a sealing ring is fixed on the outer wall of the main body and below the inner boss of the piston barrel, and the outer side of the sealing ring is sealed with the inner wall of the piston barrel under the inner boss. Sliding contact; the first hydraulic chamber is formed between the second radial boss and the inner boss of the piston barrel, and the second hydraulic chamber is formed between the inner boss of the piston barrel and the sealing ring; the wall of the piston barrel A first hydraulic channel connected to the first hydraulic chamber and a second hydraulic channel connected to the second hydraulic chamber are respectively provided; a first hydraulic pipeline passes through the first through hole of the main body and communicates with the first hydraulic channel. Hydraulic channel; a second hydraulic pipeline communicates with the second hydraulic channel through the second through hole of the main body; A mechanical unlocking sleeve, which is slidably sleeved on the outer upper part of the outer wall tube. The unlocking sleeve is respectively provided with a perforation corresponding to a plurality of oblong positioning holes on the outer wall tube, and a screw passes through the through hole and the corresponding The positioning hole is connected with the piston cylinder. 2. The underwater double unlocking connector according to claim 1, characterized in that: the outer wall cylinder is provided with a shaft hole, one end of a gear is provided with a gear shaft, and the center of the other end is provided with an inner hexagonal groove. The gear shaft is located in the shaft hole; the unlocking sleeve is provided with a longitudinal through groove, and the side of the longitudinal through groove is provided with a rack installation part, and a rack is arranged on the rack installation part, and the rack and the The above gear meshing connection. 3. The underwater double unlocking connector according to claim 2, characterized in that: the outer wall cylinder is evenly distributed with a plurality of longitudinally arranged guide strips in the circumferential direction, and the unlocking sleeve is provided with corresponding guide strips. U-shaped guide groove. 4. The underwater double unlocking connector according to claim 1, characterized in that: an annular assembly groove is provided on the lower part of the outer wall of the main body and on the lower side of the sealing ring, and a plurality of arc-shaped support blocks are assembled in the annular assembly groove. In the groove, the support block is protruded on the outer wall of the main body, the bottom of the sealing ring is against the top of the support block; an annular support leg is arranged between the piston barrel and the main body, and the upper end of the annular support leg is against the top of the support block. At the bottom, the lower end of the annular support leg abuts against the top of the locking ring. 5. The underwater double unlocking connector according to claim 4, characterized in that: the inner wall of the lower end of the annular support leg is upwardly provided with a sinking groove, and the bottom surface of the sinking groove is located below the bottom end of the main body. 6. The underwater double unlocking connector according to claim 4, characterized in that: the outer wall of the annular support leg is provided with a tapered surface that gradually expands radially from top to bottom, and the inner wall of the piston cylinder is provided with a A positioning tapered surface corresponding to the tapered surface. 7. The underwater double unlocking connector according to claim 1, characterized in that: the inner wall of the bottom end of the piston barrel is provided with a driving taper corresponding to the locking ring taper. 8. The underwater double unlocking connector according to claim 1, wherein a sealing ring assembly is provided at the bottom of the main body. 9. The underwater double unlocking connector as claimed in claim 1, characterized in that: two slide grooves are radially symmetrically arranged on the annular plane of the annular horn body, and a guide is provided at the bottom of the bearing bush. The slide block, each guide slide block is slid in the corresponding chute respectively.

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