阅读说明：本技术 一种真空绝热低温连接器 (Vacuum heat insulation low-temperature connector ) 是由 黄福友 李文翰 孙宪栋 刘海飞 刘照智 刘忠明 张振华 王建秋 甄恩发 杨俊恒 于 2021-06-29 设计创作，主要内容包括：本发明涉及一种真空绝热低温连接器,包括连接座和对接头,连接座和对接头之间设有球锁,连接座包括第一内管和第一外管,第一内管和第一外管的右端通过第一锥管密封连接,第一外管的左端通过第一封堵件与第一内管密封连接,第一外管上设有第一抽真空管接头,第一内管上包覆有第一绝热层；对接头包括第二内管和第二外管,第二内管和第二外管的左端通过与第一锥管配合的第二锥管密封连接,第二锥管与第一锥管之间设有第一密封圈,第二外管的右端通过第二封堵件与第二内管密封连接,第二外管上设有第二抽真空管接头,第二内管上包覆有第二绝热层。其具有结构简单、连接方便、密封可靠、绝热效果好的优点,可有效避免结霜、结冰现象。(The invention relates to a vacuum heat insulation low-temperature connector which comprises a connecting seat and a butt joint, wherein a ball lock is arranged between the connecting seat and the butt joint, the connecting seat comprises a first inner tube and a first outer tube, the right ends of the first inner tube and the first outer tube are connected in a sealing mode through a first taper tube, the left end of the first outer tube is connected with the first inner tube in a sealing mode through a first plugging piece, a first vacuumizing tube joint is arranged on the first outer tube, and a first heat insulation layer is coated on the first inner tube; the butt joint comprises a second inner pipe and a second outer pipe, the left ends of the second inner pipe and the second outer pipe are connected with a second taper pipe in a sealing mode through a first taper pipe matched with the first taper pipe, a first sealing ring is arranged between the second taper pipe and the first taper pipe, the right end of the second outer pipe is connected with the second inner pipe in a sealing mode through a second plugging piece, a second vacuumizing pipe joint is arranged on the second outer pipe, and a second heat insulation layer is coated on the second inner pipe. The novel heat-insulation pipe has the advantages of simple structure, convenience in connection, reliability in sealing and good heat-insulation effect, and can effectively avoid frosting and icing.)

1. A vacuum insulation low-temperature connector comprises a connecting seat (1) and a butt joint (2) which are oppositely arranged, wherein a ball lock (3) is arranged between the connecting seat (1) and the butt joint (2), and the vacuum insulation low-temperature connector is characterized in that the connecting seat (1) comprises a first inner tube (11) and a first outer tube (12), the right ends of the first inner tube (11) and the first outer tube (12) are hermetically connected through a first conical tube (13), the left end of the first outer tube (12) is hermetically connected with the first inner tube (11) through a first plugging piece (14), a first vacuumizing tube joint (15) is arranged on the first outer tube (12), and a first insulation layer (16) is coated on the first inner tube (11) between the first conical tube (13) and the first plugging piece (14); the butt joint (2) comprises a second inner pipe (21) and a second outer pipe (22), the left end of the second inner pipe (21) and the left end of the second outer pipe (22) are connected with a second taper pipe (23) matched with a first taper pipe (13) in a sealing mode, a first sealing ring is arranged between the second taper pipe (23) and the first taper pipe (13), the right end of the second outer pipe (22) is connected with the second inner pipe (21) in a sealing mode through a second plugging piece (24), a second vacuumizing pipe joint (25) is arranged on the second outer pipe (22), and a second heat insulation layer (26) is wrapped on the second inner pipe (21) between the second taper pipe (23) and the second plugging piece (24).

2. The vacuum heat insulation cryogenic connector according to claim 1, wherein the connecting base (1) further comprises a first sleeve (17), the first sleeve (17) is sleeved outside the first outer pipe (12), the left end of the first sleeve (17) is fixedly connected with the first outer pipe (12), a first heat insulation sleeve (18) is clamped between the first sleeve (17) and the first outer pipe (12), and the inner cavity of the right end of the first heat insulation sleeve (18) is a conical cavity; the butt joint (2) further comprises a second sleeve (27), the second sleeve (27) is sleeved on the outer side of the second outer pipe (22), the right end of the second sleeve (27) is fixedly connected with the second outer pipe (22), a second heat insulation sleeve (28) is clamped between the second sleeve (27) and the second outer pipe (22), and a conical head matched with the conical cavity of the first heat insulation sleeve (18) is arranged at the left end of the second heat insulation sleeve (28).

3. The vacuum heat insulation cryogenic connector according to claim 2, wherein the ball lock (3) comprises a ball seat (31), a piston (32), a sliding sleeve (33) and a support ring (34), the ball seat (31) is fixed at the right end of the first sleeve (17), a plurality of ball sockets are arranged on the outer wall of the ball seat (31), the piston (32) is sleeved on the ball seat (31), a tapered hole corresponding to the ball sockets is arranged on the peripheral wall of the piston (32), a steel ball (321) is arranged in the tapered hole, the sliding sleeve (33) is sleeved on the piston (32), a tapered wall (331) is arranged in an inner cavity of the sliding sleeve (33), the inner diameter of the sliding sleeve (33) at the left side of the tapered wall (331) is larger than that of the sliding sleeve (33) at the right side, the support ring (34) is fixed at the right end of the second sleeve (27), and a plurality of compression assemblies (35) are arranged between the support ring (34) and the piston (32), two sides of the support ring (34) are respectively hinged with an eccentric rod (36), the eccentric rods (36) are hinged with the sliding sleeve (33) through connecting rods (37), and a driving handle (38) is arranged between the eccentric rods (36).

4. The vacuum insulation cryogenic connector of claim 3, wherein the pressing assembly (35) comprises a support rod (351), a cam handle (352), a return spring (353), a pressing disc spring (354) and an arc pad (355), the left end of the support rod (351) is fixedly connected with the piston (32), the right end of the support rod (351) penetrates through the support ring (34) and is hinged to the cam handle (352), the return spring (353), the pressing disc spring (354) and the arc pad (355) are sleeved on the support rod (351), two ends of the return spring (353) are correspondingly pressed against the piston (32) and the support ring (34), and two ends of the pressing disc spring (354) are correspondingly pressed against the support ring (34) and the arc pad (355).

5. The vacuum insulation cryogenic connector according to claim 4, wherein the left end of the second sleeve (27) is provided with a first retaining ring (271) extending outwards, a second sealing ring is arranged between the first retaining ring (271) and the inner wall of the piston (32), the left end of the piston (32) is provided with a second retaining ring (322) extending inwards, and a third sealing ring is arranged between the second retaining ring (322) and the outer wall of the second sleeve (27); the second sleeve (27) is provided with a pneumatic pressing pipe joint (29), and the pneumatic pressing pipe joint (29) is communicated with a gap between the first retaining ring (271) and the second retaining ring (322).

6. A vacuum insulation cryogenic connector according to claim 4, characterized in that the left end of the first sleeve (17) is connected with the first outer pipe (12) in a sealing manner, the right end of the second sleeve (27) is connected with the second outer pipe (22) in a sealing manner, a fourth sealing ring and a fifth sealing ring are correspondingly arranged between the second insulation sleeve (28) and the second sleeve (27) and the inner wall of the first sleeve (17), and a sixth sealing ring is arranged between the second insulation sleeve (28) and the first insulation sleeve (18).

7. A vacuum insulated cryogenic connector according to claim 6, characterized in that a first gap (181) is provided between the right end of the first insulating sleeve (18) and the first outer tube (12), a second gap (281) is provided between the left end of the second insulating sleeve (28) and the second outer tube (22), two grooves (282) communicating with the second gap (281) are further provided on the inner wall of the second insulating sleeve (28), two replacement pipe joints (272) are fixed on the second sleeve (27), and the two replacement pipe joints (272) correspondingly communicate with the two grooves (282).

8. A vacuum insulated cryogenic connector according to claim 4, characterized in that the first and second plugging members (14, 24) are corrugated tubes, the first plugging member (14) is welded at both ends to the first outer tube (12) and the first inner tube (11), respectively, and the second plugging member (24) is welded at both ends to the second outer tube (22) and the second inner tube (21), respectively; a gap is reserved between the first heat insulation layer (16) and the first outer pipe (12), and a gap is reserved between the second heat insulation layer (26) and the second outer pipe (22).

9. A vacuum insulated cryogenic connector according to claim 4, characterized in that the first inner pipe (11), the first outer pipe (12) and the first conical pipe (13) are made in one piece, and the second inner pipe (21), the second outer pipe (22) and the first conical pipe (13) are made in one piece; the left end of the first inner pipe (11) is provided with a first flange (111), and the right end of the second inner pipe (21) is provided with a second flange (211).

10. The vacuum insulation low-temperature connector according to claim 4, wherein the first thermal insulation layer (16) and the second thermal insulation layer (26) are respectively formed by winding a composite film into a plurality of layers, the composite film is formed by stacking a reflecting film and a separating film, the reflecting film is an aluminum foil or an aluminum-plated polyester film, and the separating film is glass fiber paper or synthetic fiber cloth; the first heat-insulating sleeve (18) and the second heat-insulating sleeve (28) are made of polyimide, PEEK or epoxy glass fiber reinforced plastic.

Technical Field

The invention relates to a connector, in particular to a vacuum heat insulation connector for filling a low-temperature medium.

Background

In the aerospace field, the low-temperature connector is used as a functional component for filling and releasing low-temperature medium of a rocket, and the requirements of stable connection and reliable shedding are required to be met. However, the existing low-temperature connector has the problems of complex structure and inconvenient connection in practical application, and particularly, after long-time low-temperature medium filling, the phenomena of frosting and icing are easily generated at the connection part, so that unlocking and dropping actions cannot be smoothly completed, and the safety of rocket launching is influenced.

Disclosure of Invention

The invention aims to provide a vacuum heat insulation low-temperature connector which has the advantages of simple structure, convenience in connection, reliability in sealing and good heat insulation effect, can effectively avoid frosting and icing phenomena, and ensures the reliability of locking and falling.

In order to solve the problems in the prior art, the invention provides a vacuum heat insulation low-temperature connector which comprises a connecting seat and a butt joint which are oppositely arranged, wherein a ball lock is arranged between the connecting seat and the butt joint, the connecting seat comprises a first inner tube and a first outer tube, the right ends of the first inner tube and the first outer tube are hermetically connected through a first conical tube, the left end of the first outer tube is hermetically connected with the first inner tube through a first plugging piece, a first vacuumizing tube joint is arranged on the first outer tube, and a first heat insulation layer is coated on the first inner tube between the first conical tube and the first plugging piece; the butt joint comprises a second inner pipe and a second outer pipe, the left ends of the second inner pipe and the second outer pipe are connected with a second taper pipe in a sealing mode through a first taper pipe matched with the first taper pipe, a first sealing ring is arranged between the second taper pipe and the first taper pipe, the right end of the second outer pipe is connected with the second inner pipe in a sealing mode through a second plugging piece, a second vacuumizing pipe joint is arranged on the second outer pipe, and a second heat insulating layer wraps the second inner pipe between the second taper pipe and the second plugging piece.

Further, the vacuum heat insulation low-temperature connector further comprises a first sleeve, the first sleeve is sleeved outside the first outer pipe, the left end of the first sleeve is fixedly connected with the first outer pipe, a first heat insulation sleeve is clamped between the first sleeve and the first outer pipe, and an inner cavity at the right end of the first heat insulation sleeve is a conical cavity; the butt joint further comprises a second sleeve sleeved outside the second outer pipe, the right end of the second sleeve is fixedly connected with the second outer pipe, a second heat-insulating sleeve is clamped between the second sleeve and the second outer pipe, and a conical head matched with the conical cavity of the first heat-insulating sleeve is arranged at the left end of the second heat-insulating sleeve.

Further, the vacuum heat insulation low-temperature connector comprises a ball seat, a piston, a sliding sleeve and a support ring, wherein the ball seat is fixed at the right end of the first sleeve, a plurality of ball sockets are arranged on the outer wall of the ball seat, the piston is sleeved on the ball seat, a tapered hole corresponding to the ball sockets is arranged on the peripheral wall of the piston, a steel ball is arranged in the tapered hole, the sliding sleeve is sleeved on the piston, a tapered wall is arranged in an inner cavity of the sliding sleeve, the inner diameter of the sliding sleeve on the left side of the tapered wall is larger than that of the sliding sleeve on the right side of the tapered wall, the support ring is fixed at the right end of the second sleeve, a plurality of compression assemblies are arranged between the support ring and the piston, eccentric rods are hinged to two sides of the support ring respectively, the eccentric rods are hinged to the sliding sleeve through connecting rods, and a driving handle is arranged between the eccentric rods.

Furthermore, the vacuum heat insulation low-temperature connector comprises a pressing assembly, wherein the pressing assembly comprises a supporting rod, a cam handle, a reset spring, a pressing disc spring and an arc pad, the left end of the supporting rod is fixedly connected with a piston, the right end of the supporting rod penetrates through the supporting ring and is hinged with the cam handle, the reset spring, the pressing disc spring and the arc pad are sleeved on the supporting rod, two ends of the reset spring correspondingly press against the piston and the supporting ring, and two ends of the pressing disc spring correspondingly press against the supporting ring and the arc pad.

Further, the vacuum heat insulation low-temperature connector is characterized in that a first baffle ring extending outwards is arranged at the left end of the second sleeve, a second sealing ring is arranged between the first baffle ring and the inner wall of the piston, a second baffle ring extending inwards is arranged at the left end of the piston, and a third sealing ring is arranged between the second baffle ring and the outer wall of the second sleeve; and a pneumatic pressing pipe joint is arranged on the second sleeve pipe and is communicated with a gap between the first retaining ring and the second retaining ring.

Furthermore, the vacuum heat insulation low-temperature connector is characterized in that the left end of the first sleeve is in sealing connection with the first outer pipe, the right end of the second sleeve is in sealing connection with the second outer pipe, a fourth sealing ring and a fifth sealing ring are correspondingly arranged between the second heat insulation sleeve and the inner walls of the second sleeve and the first sleeve, and a sixth sealing ring is arranged between the second heat insulation sleeve and the first heat insulation sleeve.

Further, the vacuum heat insulation low-temperature connector is characterized in that a first gap is formed between the right end of the first heat insulation sleeve and the first outer pipe, a second gap is formed between the left end of the second heat insulation sleeve and the second outer pipe, two grooves communicated with the second gap are further formed in the inner wall of the second heat insulation sleeve, two replacement pipe joints are fixed on the second sleeve, and the two replacement pipe joints are correspondingly communicated with the two grooves.

Further, the vacuum heat insulation low-temperature connector is characterized in that the first plugging piece and the second plugging piece are both corrugated pipes, two ends of the first plugging piece are correspondingly welded with the first outer pipe and the first inner pipe, and two ends of the second plugging piece are correspondingly welded with the second outer pipe and the second inner pipe; a gap is reserved between the first heat insulation layer and the first outer pipe, and a gap is reserved between the second heat insulation layer and the second outer pipe.

Further, the invention relates to a vacuum heat insulation low-temperature connector, wherein the first inner pipe, the first outer pipe and the first taper pipe are manufactured integrally, and the second inner pipe, the second outer pipe and the first taper pipe are manufactured integrally; the left end of the first inner pipe is provided with a first flange, and the right end of the second inner pipe is provided with a second flange.

Further, the vacuum heat insulation low-temperature connector is characterized in that the first heat insulation layer and the second heat insulation layer are respectively formed by winding a plurality of layers of composite films, each composite film is formed by overlapping a reflecting film and an isolating film, the reflecting film is an aluminum foil or an aluminized polyester film, and the isolating film is glass fiber paper or synthetic fiber cloth; the first heat-insulating sleeve and the second heat-insulating sleeve are made of polyimide, PEEK or epoxy glass fiber reinforced plastic.

Compared with the prior art, the vacuum heat insulation low-temperature connector has the following advantages: the invention is provided with the connecting seat and the butt joint which are distributed oppositely, and the ball lock is arranged between the connecting seat and the butt joint, so that the connecting seat is provided with the first inner pipe and the first outer pipe, the right ends of the first inner pipe and the first outer pipe are connected in a sealing way through the first taper pipe, the left end of the first outer pipe is connected with the first inner pipe in a sealing way through the first plugging piece, the first vacuumizing pipe joint is arranged on the first outer pipe, and the first inner pipe between the first taper pipe and the first plugging piece is coated with the first heat insulation layer; meanwhile, a second inner pipe and a second outer pipe are arranged on the butt joint, the left ends of the second inner pipe and the second outer pipe are in sealing connection with a second taper pipe matched with the first taper pipe, a first sealing ring is arranged between the second taper pipe and the first taper pipe, the right end of the second outer pipe is in sealing connection with the second inner pipe through a second plugging piece, a second vacuumizing pipe joint is arranged on the second outer pipe, and a second heat insulating layer is coated on the second inner pipe between the second taper pipe and the second plugging piece. Therefore, the vacuum heat insulation low-temperature connector with simple structure, convenient connection, reliable sealing and good heat insulation effect is formed. In practical application, the connecting seat is fixed on the rocket in a sealing mode through the first inner tube, the butt joint is fixedly connected with the filling pipeline in a sealing mode through the second inner tube, during filling, the butt joint is firstly butted with the connecting seat and locked and fixed through the ball lock, then the butt joint is respectively connected with the first vacuumizing tube connector and the second vacuumizing tube connector through the vacuumizing device, and low-temperature media can be filled into the rocket after vacuumizing; the discharging process is the same as the filling process, and only the low-temperature medium is discharged from the rocket into the filling pipeline; when the rocket is launched, the ball lock is firstly unlocked, and the take-off of the rocket can cause the butt joint to automatically separate (fall off) from the connecting seat. According to the invention, the first taper pipe and the second taper pipe are correspondingly arranged on the connecting seat and the butt joint, and the aim of automatic alignment can be realized by utilizing the guiding function between the first taper pipe and the second taper pipe in the butt joint process, so that the convenience of butt joint operation is improved, the butt joint surface between the first taper pipe and the second taper pipe is increased, and the stability of connection is improved; set up first inner tube and first outer tube through making the connecting seat, make the butt joint set up second inner tube and second outer tube, and correspond on first outer tube and second outer tube and set up first evacuation coupling and second evacuation coupling, utilize the evacuation can effectively improve the thermal insulation performance of connecting seat and butt joint, and simultaneously, through corresponding first thermal insulation layer of cladding and second thermal insulation layer on first inner tube and second inner tube, the thermal insulation performance of connecting seat and butt joint has been strengthened, can avoid producing frosting at junction between them, the phenomenon of freezing, the connector unblock has been improved, the reliability that drops.

A vacuum insulated cryogenic connector of the present invention is described in further detail below with reference to specific embodiments shown in the drawings.

Drawings

FIG. 1 is a front view of a vacuum insulated cryogenic connector of the present invention in a locked state;

FIG. 2 is a top view of a vacuum insulated cryogenic connector of the present invention in a locked state;

FIG. 3 is a perspective view of a vacuum insulated cryogenic connector of the present invention in a locked state;

FIG. 4 is a view taken along line A-A of FIG. 1;

FIG. 5 is a view taken along line B-B of FIG. 2;

FIG. 6 is an elevational view of an unlocked state of a vacuum insulated cryogenic connector of the present invention;

FIG. 7 is a perspective view of an unlocked state of a vacuum insulated cryogenic connector of the present invention;

fig. 8 is a view along the line C-C in fig. 6.

Detailed Description

First, it should be noted that, the directional terms such as up, down, left, right, front, rear, etc. described in the present invention are only described with reference to the accompanying drawings for easy understanding, and do not limit the technical solution and the claimed scope of the present invention.

As shown in fig. 1 to 8, an embodiment of a vacuum insulation cryogenic connector according to the present invention includes a connecting socket 1 and an opposite joint 2, which are oppositely disposed, and a ball lock 3 is disposed between the connecting socket 1 and the opposite joint 2. The connecting seat 1 is provided with a first inner tube 11 and a first outer tube 12, the right ends of the first inner tube 11 and the first outer tube 12 are connected in a sealing mode through a first taper tube 13, the left end of the first outer tube 12 is connected with the first inner tube 11 in a sealing mode through a first plugging piece 14, a first vacuumizing tube joint 15 is arranged on the first outer tube 12, and a first heat insulation layer 16 is coated on the first inner tube 11 between the first taper tube 13 and the first plugging piece 14. Meanwhile, a second inner tube 21 and a second outer tube 22 are arranged on the butt joint 2, the left ends of the second inner tube 21 and the second outer tube 22 are hermetically connected through a second taper tube 23 matched with the first taper tube 13, a first sealing ring is arranged between the second taper tube 23 and the first taper tube 13, the right end of the second outer tube 22 is hermetically connected with the second inner tube 21 through a second plugging piece 24, a second vacuumizing tube joint 25 is arranged on the second outer tube 22, and a second heat-insulating layer 26 is coated on the second inner tube 21 between the second taper tube 23 and the second plugging piece 24.

The vacuum heat insulation low-temperature connector with simple structure, convenient connection, reliable sealing and good heat insulation effect is formed through the structure arrangement. In practical application, the connecting base 1 is fixed on the rocket in a sealing way through the first inner pipe 11, and the butt joint 2 is fixedly connected with the filling pipeline in a sealing way through the second inner pipe 21. During filling, the butt joint 2 is firstly butted with the connecting seat 1, locked and fixed through the ball lock 3, then respectively connected with the first vacuumizing pipe joint 15 and the second vacuumizing pipe joint 25 through a vacuumizing device, and low-temperature media can be filled into the rocket after vacuumizing. The venting back process is the same as the filling process except that the cryogenic medium is vented from the rocket back into the filling line. When the rocket is launched, the ball lock 3 should be unlocked firstly, and the take-off of the rocket can lead the butt joint 2 to be separated (fall off) from the connecting seat 1 automatically. According to the invention, the first taper pipe 13 and the second taper pipe 23 are correspondingly arranged on the connecting seat 1 and the butt joint 2, and the aim of automatic alignment can be realized by utilizing the guiding function between the first taper pipe 13 and the second taper pipe 23 in the butt joint process, so that the convenience of butt joint operation is improved, the butt joint surface between the first taper pipe 13 and the second taper pipe 23 is increased, and the stability of connection is improved; through making connecting seat 1 set up first inner tube 11 and first outer tube 12, make butt joint 2 set up second inner tube 21 and second outer tube 22, and correspond on first outer tube 12 and second outer tube 22 and set up first evacuation coupling 15 and second evacuation coupling 25, utilize the evacuation can effectively improve the thermal insulation performance of connecting seat 1 and butt joint 2, and simultaneously, through corresponding cladding first heat insulation layer 16 and second heat insulation layer 26 on first inner tube 11 and second inner tube 21, the thermal insulation performance of connecting seat 1 and butt joint 2 has been strengthened, can avoid producing frosting at junction between them, icing phenomenon, the connector unblock has been improved, the reliability that drops. In practical applications, the present invention generally employs a composite film wound by multiple layers to form the first thermal insulation layer 16 and the second thermal insulation layer 26, wherein the composite film is formed by stacking a reflective film and a separation film, the reflective film may employ aluminum foil or aluminum-plated polyester film, and the separation film may employ fiberglass paper or synthetic fiber cloth. This structural arrangement enhances the thermal insulation effect of the first thermal insulation layer 16 and the second thermal insulation layer 26 by the dual function of the reflective film and the insulating film. It should be noted that the structure of the first thermal insulation layer 16 and the second thermal insulation layer 26 is not limited to the above-mentioned forms, and other structures may be employed as long as the purpose of thermal insulation is achieved. In order to ensure the sealing performance between the second taper pipe 23 and the first taper pipe 13, the invention generally arranges more than two first sealing rings, and clamps the first sealing rings in the sealing groove arranged on the second taper pipe 23.

As an optimized scheme, the embodiment also provides the first sleeve 17 and the second sleeve 27 for the connecting seat 1 and the butt joint 2 correspondingly. The first sleeve 17 is sleeved outside the first outer tube 12, so that the left end of the first sleeve 17 is fixedly connected with the first outer tube 12, the first insulating sleeve 18 is clamped between the first sleeve 17 and the first outer tube 12, and the inner cavity of the right end of the first insulating sleeve 18 is a conical cavity. The second sleeve 27 is sleeved outside the second outer pipe 22, the right end of the second sleeve 27 is fixedly connected with the second outer pipe 22, the second heat-insulating sleeve 28 is clamped between the second sleeve 27 and the second outer pipe 22, and a conical head matched with the conical cavity of the first heat-insulating sleeve 18 is arranged at the left end of the second heat-insulating sleeve 28. The structure improves the heat insulation performance of the connecting seat 1 and the butt joint 2 through the matching of the first heat insulation sleeve 18, the second heat insulation sleeve 28 and the conical surfaces of the first heat insulation sleeve and the second heat insulation sleeve, reduces the risks of frosting and icing at the joint of the first heat insulation sleeve and the second heat insulation sleeve, and enhances the unlocking and falling reliability of the connector. In practical applications, the present invention generally makes the first insulating sheath 18 and the second insulating sheath 28 made of non-metallic materials such as polyimide, PEEK (polyetheretherketone) or epoxy glass fiber reinforced plastic to ensure the insulating performance. However, it should be noted that the first insulating jacket 18 and the second insulating jacket 28 are not limited to the above materials, and may be made of other non-metallic materials as long as the purpose of insulating heat is achieved.

As a specific embodiment, the present invention adopts the following structure for the ball lock 3: the piston comprises a ball seat 31, a piston 32, a sliding sleeve 33 and a support ring 34, wherein the ball seat 31 is of an annular structure, and the piston 32 and the sliding sleeve 33 are of a sleeve structure. The ball seat 31 is fixed to the right end of the first sleeve 17, and a plurality of ball sockets distributed in the circumferential direction are provided on the outer wall of the ball seat 31. The piston 32 is fitted over the ball seat 31, and a tapered hole corresponding to the ball seat is provided in the circumferential wall of the piston 32, and a steel ball 321 is provided in the tapered hole. The sliding sleeve 33 is sleeved on the piston 32, and a tapered wall 331 is arranged in the inner cavity of the sliding sleeve 33, so that the inner diameter of the sliding sleeve 33 at the left side of the tapered wall 331 is larger than that of the sliding sleeve 33 at the right side. A support ring 34 is fixed at the right end of the second sleeve 27, a plurality of packing assemblies 35 are provided between the support ring 34 and the piston 32, eccentric rods 36 are hinged to both sides of the support ring 34, respectively, such that the eccentric rods 36 are hinged to the sliding sleeve 33 through connecting rods 37, and a driving handle 38 is provided between the eccentric rods 36. The ball lock 3 with the arrangement has the advantages of simple structure, convenient operation and reliable locking. In practical application, the sliding sleeve 33 is pulled backwards through the driving handle 38, the eccentric rod 36 and the connecting rod 37, so that the ball lock 3 is in an unlocking state; then, the butt joint 2 is butt jointed with the connecting seat 1, and the piston 32 is sleeved on the ball seat 31, so that the steel balls 321 correspond to the ball seats one by one; then, the sliding sleeve 33 is pushed forward by the driving handle 38, the eccentric rod 36 and the connecting rod 37, and the steel ball 321 is extruded into the ball socket through the sliding sleeve 33, so that the locking and fixing purposes can be realized. In practical applications, the ball seat 31 is usually fixed to the right end of the first sleeve 17 by screwing, so as to facilitate the dismounting, but not limited to screwing, and the ball seat may also be fixed by welding. Similarly, in order to facilitate the assembly and disassembly, the support ring 34 of the present invention is a split structure formed by two halves which are butted and fixed at the right end of the second sleeve 27 by a plurality of screws. It should be noted that the tapered wall 331 of the sliding sleeve 33 is to extrude the steel ball 321, and in order to ensure that the steel ball 321 does not fall off in the unlocked state, the inner diameter of the sliding sleeve 33 on the left side of the tapered wall 331 should not be set too large, and the distance between the inner wall of the sliding sleeve 33 and the outer wall of the piston 32 should be smaller than the diameter of the steel ball 321; the eccentricity of the eccentric rod 36 means that the hinge point of the eccentric rod 36 and the connecting rod 37 deviates from the hinge point of the eccentric rod 36 and the supporting ring 34, so that the purpose of pushing and pulling the sliding sleeve 33 is achieved by rotating the eccentric rod 36.

As a specific embodiment, the present invention employs the following structure for the pressing assembly 35: the hydraulic support comprises a support rod 351, a cam handle 352, a return spring 353, a pressing disc spring 354 and an arc pad 355, wherein the left end of the support rod 351 is fixedly connected with the piston 32, the right end of the support rod 351 penetrates through the support ring 34 and is hinged to the cam handle 352, the return spring 353, the pressing disc spring 354 and the arc pad 355 are sleeved on the support rod 351, two ends of the return spring 353 correspondingly press against the piston 32 and the support ring 34, two ends of the pressing disc spring 354 correspondingly press against the support ring 34 and the arc pad 355, and the arc pad 355 is located between the pressing disc spring 354 and the cam handle 352. The pressing assembly 35 has the advantages of simple structure, simplicity and convenience in operation and reliability in pressing, the sealing performance between the butt joint 2 and the connecting seat 1 can be enhanced by operating the pressing assembly 35, and the adaptability to low-temperature deformation is improved. The specific process is as follows: after the butt joint 2 is butted with the connecting seat 1 and is locked and fixed through the ball lock 3, the cam handle 352 is rotated to enable the convex side of the cam handle to face the arc pad 355, the support ring 34 is fixedly connected with the second sleeve 27, the support rod 351 is fixedly connected with the piston 32, and the piston 32 is locked and fixed with the ball seat 31 through the steel ball 321, the butt joint 2 tends to move towards the connecting seat 1 under the jacking action of the compression disc spring 354 and is tightly sealed and extruded together, and the low-temperature deformation of the butt joint 2 and the connecting seat 1 can be effectively compensated through the elasticity of the compression disc spring 354, so that the sealing specific pressure between the butt joint 2 and the connecting seat 1 always meets the sealing requirement, and the sealing reliability between the butt joint 2 and the connecting seat 1 is enhanced. In practical applications, the present invention generally provides a threaded connection between the support rod 351 and the piston 32 for easy assembly, disassembly and adjustment, but the present invention is not limited to the threaded connection, and may also be welded or otherwise fixed. In order to improve the structural stability, the present invention generally provides an inwardly extending annular platform at the right end of the sliding sleeve 33, and in this case, the support rod 351 and the return spring 353 are arranged to penetrate the annular platform of the sliding sleeve 33.

As an optimized solution, the present embodiment is provided with a first stop ring 271 extending outward at the left end of the second sleeve 27, and a second sealing ring is provided between the first stop ring 271 and the inner wall of the piston 32; a second stopper 322 extending inward is provided at the left end of the piston 32, and a third seal ring is provided between the second stopper 322 and the outer wall of the second sleeve 27; meanwhile, a pneumatic pressure coupling 29 is provided on the second sleeve 27, and the pneumatic pressure coupling 29 is communicated with a gap between the first stopper ring 271 and the second stopper ring 322. The structure is arranged to fill gas between the first retaining ring 271 and the second retaining ring 322 through the pneumatic compression pipe joint 29, so that the pneumatic compression purpose is realized, and the sealing reliability between the butt joint 2 and the connecting seat 1 is enhanced. The specific process is as follows, after the butt joint 2 is butted with the connecting seat 1 and locked and fixed through the ball lock 3, the pneumatic pressing pipe joint 29 is used for filling gas between the first retaining ring 271 and the second retaining ring 322, and as the piston 32 is locked and fixed with the ball seat 31 through the steel ball 321, the butt joint 2 can generate the trend of moving towards the connecting seat 1 and tightly seal and squeeze the butt joint 2 and the connecting seat 1 together under the action of air pressure, so that the sealing reliability between the butt joint 2 and the connecting seat 1 is enhanced. In practical applications, in order to ensure the structural stability, the present invention generally provides two second seal rings and two third seal rings, respectively, and the two second seal rings are clamped in the seal grooves provided on the first retaining ring 271, and the two third seal rings are clamped in the seal grooves provided on the second retaining ring 322.

As an optimized solution, in the present embodiment, the left end of the first sleeve 17 is hermetically connected to the first outer tube 12, the right end of the second sleeve 27 is hermetically connected to the second outer tube 22, the fourth and fifth seal rings are provided between the second heat insulating jacket 28 and the second sleeve 27 and the inner wall of the first sleeve 17, respectively, and the sixth seal ring is provided between the second heat insulating jacket 28 and the first heat insulating jacket 18. The sealing performance between the butt joint 2 and the connecting seat 1 is further enhanced by arranging the fourth sealing ring, the fifth sealing ring and the sixth sealing ring. In practical application, the present invention generally adopts a welding, sealing and fixing manner for the first sleeve 17 and the second sleeve 27; and the fourth sealing ring, the fifth sealing ring and the sixth sealing ring are clamped in the sealing grooves arranged on the second heat-insulating sleeve 28, so that the stability of the structure is ensured. Meanwhile, the present embodiment further provides a first gap 181 between the right end of the first insulating sheath 18 and the first outer tube 12, a second gap 281 between the left end of the second insulating sheath 28 and the second outer tube 22, two grooves 282 communicating with the second gap 281 on the inner wall of the second insulating sheath 28, and two replacement nipples 272 sealingly fixed on the second sleeve 27 such that the two replacement nipples 272 communicate with the two grooves 282, respectively. This structure setting is through first clearance 18, second clearance 281, two slots 282 and two mutual intercommunications of replacement coupling 272, has just formed the blowdown runner in the junction periphery of first outer tube 12 and second outer tube 22, and in practical application, both can replace the air in the blowdown runner before the filling to avoid causing the frost, icing because of the air condensation, can also take away cold volume through continuously letting in normal atmospheric temperature nitrogen gas in the blowdown runner in the filling process, can effectively avoid the sealing in first outer tube 12 and the second outer tube 22 outside to lose efficacy because of the low temperature, has strengthened sealed reliability and practicality.

As a specific embodiment, the present invention employs a bellows structure for each of the first and second plugging members 14 and 24, wherein both ends of the first plugging member 14 are welded to the first outer tube 12 and the first inner tube 11, respectively, and both ends of the second plugging member 24 are welded to the second outer tube 22 and the second inner tube 21, respectively. The low-temperature deformation of the connecting seat 1 and the butt joint 2 can be compensated through the expansion and contraction of the corrugated pipe, and the structural stability and the adaptability to low temperature of the connector are enhanced. To enhance the vacuum insulation effect, the present embodiment provides a gap between the first thermal insulation layer 16 and the first outer pipe 12, and a gap between the second thermal insulation layer 26 and the second outer pipe 22. In order to improve the structural integrity, the present embodiment integrates the first inner tube 11, the first outer tube 12 and the first taper tube 13, and integrates the second inner tube 21, the second outer tube 22 and the first taper tube 13. In addition, in order to improve the convenience of installation and connection, the first flange 111 and the second flange 211 are correspondingly arranged at the left end of the first inner pipe 11 and the right end of the second inner pipe 21 in the present embodiment.

The above examples are only for describing the preferred embodiments of the present invention, and do not limit the scope of the claimed invention, and various modifications made by those skilled in the art according to the technical solutions of the present invention should fall within the scope of the invention defined by the claims without departing from the design concept of the present invention.