CN112413403A - Vacuumizing self-sealing interface of external pressure container and operation method thereof - Google Patents

Abstract

The invention belongs to the technical field of low-temperature heat-insulating gas cylinders, and particularly relates to a vacuumizing self-sealing interface of an external pressure container and an operation method thereof, wherein the vacuumizing self-sealing interface comprises a vacuum jacket, a valve core seat, a valve core, a pressure ring, a displacement reverse assembly rod, a first elastic piece and a second elastic piece; the valve core seat is arranged in the vacuum jacket and is provided with an air port; the valve core is arranged in the air port in a penetrating way and is provided with a sealing part matched with the air port; the pressure ring is movably arranged in an upper end hole of the vacuum jacket, a plurality of displacement reverse assembled rods are annularly and uniformly distributed between the pressure ring and the valve core, and the pressure ring is pushed to drive the sealing part to be separated from being connected with the air port; the first elastic piece and the second elastic piece are both arranged in the vacuum clamping sleeve, and when the pressing ring is released from pushing, the first elastic piece and the second elastic piece are connected with the air port in a sealing manner through the displacement reverse rod assembly driving sealing part; the sealing interface of the invention has the advantages that the fault that the threaded end cannot retreat from the threaded hole can not occur, the structure needing manual operation is reduced, the vacuum pumping efficiency is improved, and the operation method is simple and efficient.

Description

Vacuumizing self-sealing interface of external pressure container and operation method thereof

Technical Field

The invention belongs to the technical field of low-temperature heat-insulating gas cylinders, and particularly relates to a vacuumizing self-sealing interface of an external pressure container and an operation method thereof.

Background

Cryogenically insulated gas cylinders are cryogenic devices with important industrial applications, primarily for storing liquid cryogenic products obtained by cryogenic refrigeration techniques, such as liquid nitrogen, liquid oxygen, liquid hydrogen, and liquefied natural gas. The low-temperature heat-insulation gas cylinder comprises an inner container and a jacket, wherein the inner container is a low-temperature liquefied gas storage cavity. The jacket is internally provided with a vacuum cavity which plays a role in heat insulation. The outer surface of the jacket is provided with a vacuumizing interface communicated with the vacuum cavity.

At present, a vacuum connecting device is often adopted to vacuumize the jacket of a low-temperature heat-insulating gas cylinder as an intermediate connecting device of the vacuum jacket and the vacuumizing device of the low-temperature heat-insulating gas cylinder. Referring to fig. 1, the vacuum connecting apparatus includes a valve body 10 having a cavity and a valve stem 20; the cavity forms a connecting port 13 at the first end of the valve body 10, the first end of the valve body 10 is further provided with a nut 11, and the outer wall of the valve body 10 is provided with a connecting pipe 12 communicated with the cavity. The valve rod 20 is movably connected to the second end of the valve body 10, the valve rod 20 is located at one end in the cavity and is provided with a threaded end 21, and a threaded hole 32 in adaptive connection with the threaded end 21 is formed in the sealing element 31. When the vacuum chamber is vacuumized, the following operations are required: 1. the connection port 13 is sleeved on the vacuum jacket 30, and then the nut 11 is tightened to hermetically connect the connection port 13 and the vacuum jacket 30. 2. The connecting tube 12 is sealingly connected to the evacuation tube 40 of the evacuation device by means of a quick fastening mechanism 50. 3. The valve stem 20 is coupled to the sealing member 31 by pushing the valve stem 20 so that the threaded end 21 abuts the threaded hole 32 and then rotating the valve stem 20 so that the threaded end 21 is screwed into the threaded hole 32. 4. The valve rod 20 is pulled to pull the sealing member 31 out of the vacuum jacket 30, so that the vacuum jacket 30 is communicated with the vacuumizing pipe 40 of the vacuumizing device, and then the vacuumizing device works to vacuumize. 5. After the vacuum degree of the low vacuum chamber reaches a preset value, the valve rod 20 is pushed to plug the sealing piece 31 into the vacuum jacket 30 in a sealing way, and then the valve rod 20 is rotated reversely to disconnect the threaded end 21 from the threaded hole 32. 6. The quick fastening mechanism 50 is unscrewed, the connecting pipe 12 is disconnected from the evacuation pipe 40, then the nut 11 is unscrewed, the vacuum connection device is taken down, and evacuation is completed.

However, the above structure has the following drawbacks: 1. because the structure of the vacuum jacket has limitations, the vacuum pumping step of the vacuum cavity of the low-temperature heat-insulation gas cylinder is complex, the operation of an operator is not facilitated, and the operator is easy to make mistakes during the operation, thereby causing faults. 2. When the valve rod 20 is rotated, an operator can easily connect the threaded end 21 with the threaded hole 32 of the sealing element 31 too tightly, the sealing element 31 is sealed and plugged into the vacuum jacket 30 after vacuum pumping is finished, when the threaded end 21 is disconnected with the threaded hole 32 by rotating the valve rod 20 reversely, the friction force between the threaded end 21 and the threaded hole 32 is greater than the friction force between the sealing element 32 and the inner wall of the vacuum jacket 30, the sealing element 31 is driven to rotate relative to the vacuum jacket 30 by rotating the valve rod 20, the threaded end 21 cannot exit from the threaded hole 32, the vacuum connecting device cannot be taken down from the vacuum jacket, and the stability is poor.

Disclosure of Invention

The invention aims to provide a vacuumizing self-sealing interface of an external pressure container, and aims to solve the technical problems that in the prior art, because the structure of a vacuum jacket has limitation, the vacuumizing step of a vacuum cavity of a low-temperature heat-insulating gas cylinder is complicated, the operation of an operator is not facilitated, and errors are easily caused during the operation, so that faults are caused.

In order to achieve the above object, an external pressure container vacuumizing self-sealing interface provided by the embodiment of the present invention includes a vacuum jacket, a valve core seat, a valve core, a pressure ring, a displacement reversal set rod, a first elastic member and a second elastic member; the valve core seat is arranged in the vacuum jacket and is provided with an air port; the valve core is arranged in the air port in a penetrating way, and is provided with a sealing part matched with the air port; the compression ring is movably arranged in an upper end hole of the vacuum jacket, a plurality of displacement reverse assembly rods are annularly and uniformly distributed between the compression ring and the valve core, and the compression ring is pushed to drive the sealing part to be separated from being connected with the air port; the first elastic piece and the second elastic piece are arranged in the vacuum clamping sleeve, and when the compression ring is released to push, the first elastic piece and the second elastic piece drive the sealing part to be in sealing connection with the air port through the displacement reverse assembly rod.

Optionally, an annular limiting table extends from the inner wall of the middle part of the vacuum jacket, a boss extends from the upper end of the valve core seat, the lower end of the valve core seat penetrates through an annular hole of the annular limiting table, and the boss is in limiting abutment with the annular limiting table; the air port penetrates through the boss and is communicated with the lower end of the vacuum jacket.

Optionally, the boss is cylindrical, an external thread is arranged on the outer wall of the boss, an internal thread is arranged on the inner wall of the vacuum jacket above the annular limiting table, and the external thread is connected to the internal thread in an adaptive manner.

Optionally, the diameter of one end, close to the pressure ring, of the air port is increased gradually to form a conical groove, the sealing portion is conical, and the sealing portion is accommodated in the conical groove in a matched mode.

Optionally, the first elastic member is a spring; the first elastic piece is arranged between the pressing ring and the valve core seat, and two ends of the first elastic piece are respectively abutted to the pressing ring and the valve core seat.

Optionally, the displacement reversing set of rods comprises a first link, a second link, and a third link; the first end of the first connecting rod is rotatably connected with the pressing ring, the first end and the second end of the second connecting rod are respectively rotatably connected with the second end of the first connecting rod and the first end of the third connecting rod, and the second end of the third connecting rod is rotatably connected with the upper end of the valve core; the upper end of the valve core seat is convexly provided with a supporting part at the side of the air port, and the middle part of the second connecting rod is rotatably connected with the supporting part.

Optionally, a distance between the first end of the second link and the support portion is smaller than a distance between the second end of the second link and the support portion.

Optionally, the diameter of the lower end of the valve core seat is reduced to form a mounting portion, at least one side of the valve core seat between the air port and the mounting portion is provided with an opening, and the opening is communicated with the air port; the lower end of the valve core is movably connected with the mounting part.

Optionally, the mounting portion is provided with a connecting hole coaxially arranged with the air port in a penetrating manner, and the lower end of the valve core movably penetrates through the connecting hole; the lower end of the valve core is provided with a connecting piece, the second elastic piece is arranged between the connecting piece and the installation part, and the second elastic piece is used for driving the sealing part to be connected with the air port in a sealing mode.

An operation method for the vacuumizing self-sealing interface of the external pressure container is characterized in that the vacuum jacket is arranged on a gas pipe of a vacuum cavity of the low-temperature heat-insulation gas cylinder; the method comprises the following steps:

s100: providing a vacuumizing device, inserting a vacuumizing tube of the vacuumizing device into an upper end hole of the vacuum jacket, pushing the compression ring to move downwards by the vacuumizing tube, opening the air port, and communicating the vacuum cavity with the vacuumizing device;

s200: providing a quick fastening mechanism, fastening and connecting the vacuum-pumping pipe and the vacuum jacket through the quick fastening mechanism, and starting the vacuum-pumping device;

s300: and after the vacuum degree in the vacuum cavity reaches a preset value, unscrewing the quick fastening machine, taking the vacuum-pumping pipe down from the vacuum jacket, and driving the sealing part to seal and block the air port by the first elastic piece.

Compared with the prior art, the vacuumizing self-sealing interface of the external pressure container provided by the embodiment of the invention has one of the following technical effects:

1. when the device works, the vacuum jacket is arranged on an air pipe of a vacuum cavity of the low-temperature heat-insulation air bottle, a vacuumizing pipe of a vacuumizing device is inserted into an upper end hole of the vacuum jacket, the vacuumizing pipe pushes the pressing ring to move downwards along the inner wall of the vacuum jacket and compress the first elastic piece and the second elastic piece, the pressing ring drives the sealing part on the valve core to be separated from the sealing connection with the air port through the displacement reverse group rod, the air port is opened, and therefore the vacuum cavity is communicated with the vacuumizing device; then, the vacuum pumping pipe and the vacuum jacket are fixedly connected through the quick fastening mechanism, and the vacuum pumping device is started to pump vacuum; and finally, after the vacuum degree in the vacuum cavity reaches a preset value, unscrewing the quick fastening mechanism, taking the vacuum-pumping tube down from the vacuum jacket, driving the sealing part to seal and block the air port by the elastic resetting force of the first elastic part and the second elastic part and the pressure of the atmospheric pressure, isolating the vacuum cavity from the outside, and finishing the vacuum-pumping. Therefore, the vacuumizing self-sealing interface of the external pressure container does not need to adopt a vacuum connecting device as a vacuum jacket of the low-temperature heat-insulating gas cylinder and an intermediate connecting device of the vacuumizing device, the fault that the threaded end cannot retreat from the threaded hole cannot occur, and the stability is high; meanwhile, the vacuum jacket is simply connected with the vacuumizing pipe, so that the structure needing manual operation is reduced, the manual operation steps and the operation difficulty are reduced, the operation method is simple and efficient, the connection failure rate and the connection time are reduced, and the vacuumizing efficiency is improved.

2. The displacement reverse group rods are annularly and uniformly distributed between the pressure ring and the valve core and used for converting downward displacement of the pressure ring into larger upward displacement of the valve core, so that the sealing part of the valve core is separated from the gas port and connected, a large enough vacuumizing channel is ensured, and the vacuumizing efficiency is improved.

The external pressure container vacuumizing self-sealing interface operation method provided by the embodiment of the invention has one of the following technical effects: the operation steps of vacuumizing the vacuum cavity of the low-temperature heat-insulation gas cylinder are simple, the operation error rate is reduced, the vacuumizing operation time is shortened, and the vacuumizing efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a cross-sectional view of the evacuated self-sealing interface of the external pressure vessel provided by the invention.

Fig. 3 is a cross-sectional view of the connection state of the vacuumizing self-sealing interface of the external pressure container provided by the invention.

Fig. 4 is a schematic structural view of the valve core seat provided by the present invention.

Fig. 5 is a cross-sectional view taken along line a-a of fig. 4 in accordance with the present invention.

Fig. 6 is a flow chart of the method for operating the vacuuming self-sealing interface of the external pressure vessel provided by the invention.

Wherein, in the figures, the respective reference numerals:

the vacuum clamping device comprises a vacuum jacket 100, an upper chamber 101, a lower chamber 102, an annular limiting table 110, an internal thread 111, a sealing ring 120, a first mounting table 130, a containing groove 131, a dust cover 140, a valve core seat 200, a gas port 210, a conical groove 211, a boss 220, an external thread 221, a supporting part 230, a mounting part 240, a connecting hole 241, a side opening 250, a valve core 300, a sealing part 310, a connecting table 320, a second hinge part 321, a connecting piece 330, a pressing ring 400, an annular part 410, a first hinge part 420, a first elastic piece 500, a displacement reversal set rod 600, a first connecting rod 611, a second connecting rod 612, a first end 612a, a second end 612b, a third connecting rod 613, a vacuum pipe 700, a second mounting table 710, a quick fastening mechanism 800 and a second elastic piece.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the present invention, referring to fig. 1 and 2, a vacuum pumping self-sealing interface for an external pressure container is provided, which comprises a vacuum jacket 100, a valve core seat 200, a valve core 300, a pressure ring 400, a displacement reversal set rod, a first elastic member 500 and a second elastic member 900.

Referring to fig. 2 and 3, the valve core seat 200 is installed in the vacuum jacket 100, and the inner cavity of the vacuum jacket 100 is respectively an upper cavity 101 and a lower cavity 102. The valve core seat 200 is provided with a gas port 210, and the gas port 210 communicates the upper chamber 101 and the lower chamber 102.

Referring to fig. 2 and 3, the valve element 300 is inserted into the gas port 210, and the valve element 300 is convexly provided with a sealing portion 310 adapted to the gas port 210. The pressure ring 400 is movably installed in an upper end hole (an upper cavity 101) of the vacuum jacket 100 and is close to an opening position of the upper end hole (the upper cavity 101), and the plurality of displacement reversal assembly rods 600 are annularly and uniformly distributed between the pressure ring 400 and the valve core 300. An external force (in this embodiment, the force that the evacuation tube 700 is inserted into the upper end hole (the upper cavity 101) of the vacuum jacket 100 to push the press ring 400) pushes the press ring 400 to move down along the upper cavity 101 of the vacuum jacket 100, so that the sealing portion 310 can be driven to be disconnected from the connection with the gas port 210, and the gas port 210 is opened, thereby communicating the upper cavity 101 and the lower cavity 102.

Referring to fig. 2 and 3, the first elastic member 500 and the second elastic member 900 are both installed in the vacuum jacket 100, and when the pressing ring 400 is released from being pushed, the first elastic member 500 and the second elastic member 900 elastically drive the sealing portion 310 to be hermetically connected to the air port 210. Namely, the following is explained: when the pressing ring 400 moves down along the upper cavity 101 of the vacuum jacket 100, the first elastic member 500 and the second elastic member 900 are compressed, and when the pressing ring 400 is pushed by the release of the external force, the first elastic member 500 and the second elastic member 900 elastically return to drive the sealing portion 310 to be hermetically connected to the air port 210, so that the air port 210 is closed.

In operation, the vacuum jacket 100 is mounted to the gas pipe of the jacket of a cryogenically insulated gas cylinder (not shown) in which is located a vacuum chamber. Firstly, inserting a vacuum tube 700 of a vacuum device (not shown in the figure, the vacuum device is mature prior art, such as an air pump, a vacuum pump and the like) into an upper end hole of a vacuum jacket 100, pushing a press ring 400 to move downwards along the inner wall of an upper chamber 101 of the vacuum jacket 100 by the vacuum tube 700 and compress a first elastic member 500 and a second elastic member 900, driving a sealing part 310 on a valve core 300 to be separated from being in sealing connection with a gas port 210 by the press ring 400 through a displacement reverse assembly rod 600, and opening the gas port 210, so that a vacuum chamber of a low-temperature heat-insulation gas cylinder is communicated with the vacuum device; then, the vacuum pumping pipe 700 and the vacuum jacket 100 are fastened and connected through the fast fastening mechanism 800, and the vacuum pumping device is started to pump vacuum; finally, after the vacuum degree in the vacuum cavity reaches a preset value, the quick fastening mechanism 800 is unscrewed, the vacuum pumping tube 700 is taken down from the upper cavity 101 of the vacuum jacket 100, the elastic resetting force of the first elastic member 500 and the second elastic member 900 and the pressure of the external atmospheric pressure drive the sealing part 310 to seal and block the gas port 210, so that the vacuum cavity of the low-temperature heat-insulation gas cylinder is isolated from the outside, and the vacuum pumping is completed.

Therefore, the vacuumizing self-sealing interface of the external pressure container does not need to adopt a vacuum connecting device as the intermediate connecting device of the vacuum jacket 100 of the low-temperature heat-insulating gas cylinder and the vacuumizing device, the fault that the threaded end cannot retreat from the threaded hole cannot occur, and the stability is high; meanwhile, the vacuum jacket 100 is simply connected with the vacuumizing tube 700, so that the structure needing manual operation is reduced, the manual operation steps and the operation difficulty are reduced, the operation method is simple and efficient, the connection failure rate and the connection time are reduced, and the vacuumizing efficiency is improved.

Referring to fig. 2 and 3, an annular limiting table 110 extends from the inner wall of the middle portion of the vacuum jacket 100, a boss 220 extends from the upper end of the valve core seat 200, the lower end of the valve core seat 200 penetrates through an annular hole of the annular limiting table 110, and the lower end of the boss 220 abuts against the upper end of the annular limiting table 110, so that the valve core seat 200 is limitedly installed in the vacuum jacket 100, and the valve core seat 200 is conveniently installed. The gas port 210 penetrates through the boss 220, and the gas port 210 is communicated with the lower cavity 102 of the vacuum jacket 100.

In a specific embodiment, referring to fig. 2 and 3, the boss 220 is cylindrical, an external thread 221 is provided on an outer wall of the boss 220, an internal thread 111 is provided on an inner wall of the vacuum jacket 100 above the annular limiting table 110, the internal thread 111 extends to an upper end edge of the annular limiting table 110, the valve core seat 200 is rotated, and the external thread 221 is connected to the internal thread 111 in a matching manner, so that the valve core seat 200 can be detachably and fixedly connected in the vacuum jacket 100, and the connection is stable.

Further, referring to fig. 2 and 3, a sealing ring 120 is disposed between the annular limiting table 110 and the boss 220, so that the boss 220 and the annular limiting table 110 are connected in a sealing manner, and the vacuum chamber of the cryogenic insulation gas cylinder is prevented from leaking gas from between the annular limiting table 110 and the boss 220.

In other embodiments, the boss 220 may be fixedly bonded in the vacuum jacket 100 by using glue, so that the installation is convenient.

Preferably, referring to fig. 4 and 5, the diameter of one end of the air port 210 close to the press ring 400 is increased gradually to form a conical groove 211, the sealing portion 310 is conical, and the sealing portion 310 is accommodated in the conical groove 211 in a matching manner, and is tightly matched through conical surface matching, so that the sealing effect is good. Meanwhile, when the vacuum degree in the vacuum cavity reaches a preset value, the vacuum tube is taken down from the vacuum jacket, and the external atmospheric pressure is greater than the air pressure in the vacuum cavity, so that the sealing part 310 is pushed by the external atmospheric pressure to be hermetically connected in the conical groove 211, and the sealing performance is improved.

Referring to fig. 2 and 3, the first elastic member 500 is a spring. The first elastic piece 500 is installed between the pressure ring 400 and the valve core seat 200, and two ends of the first elastic piece 500 are respectively abutted to the pressure ring 400 and the valve core seat 200. The external force pushes the pressing ring 400 to move down along the upper cavity 101 of the vacuum jacket 100, and the pressing ring 400 compresses the first elastic member 500. When the pressing ring 400 is pushed by the external force, the elastic force of the first elastic member 500 pushes the pressing ring 400 to move upward along the upper cavity 101 of the vacuum jacket 100, the pressing ring 400 returns to the initial position, and the sealing part 310 is hermetically connected to the air port 210.

Further, referring to fig. 2 and 3, an annular portion 410 extends from the lower end of the pressing ring 400, the annular portion 410 and the pressing ring 400 are coaxially disposed, an annular hole of the annular portion 410 is larger than an annular hole of the pressing ring 400, the upper end of the first elastic member 500 is accommodated in the annular hole of the annular portion 410 in a fitting manner and abuts against the lower end surface of the pressing ring 400, and the annular portion 410 is disposed, so that the first elastic member 500 is not prone to shift when performing telescopic movement.

Specifically, referring to fig. 2 and 3, in the present embodiment, four displacement reversal group rods 600 are provided, and four displacement reversal group rods 600 are symmetrically provided. The displacement reversing set lever 600 includes a first link 611, a second link 612, and a third link 613.

Referring to fig. 2 and 3, four first hinge portions 420 are annularly and uniformly distributed on the inner side of the pressing ring 400, a first end of the first link 611 is rotatably connected with one first hinge portion 420 of the pressing ring 400 through a pin, and a first end and a second end of the second link 612 are rotatably connected with a second end of the first link 611 and a first end of the third link 613 through pins, respectively. The upper end of the valve core 300 is convexly provided with a connecting table 320, the lower end of the connecting table 320 is annularly and uniformly provided with four second hinge parts 321, and the four second hinge parts 321 and the four first hinge parts 420 are arranged in a one-to-one correspondence manner. The second end of the third link 613 is pivotally connected to a second hinge portion 321 of the connection stage of the valve body 300 by a pin. A support part 230 is convexly arranged at the upper end of the valve core seat 200 at the side of the air port 210, and the middle part of the second connecting rod 612 is rotatably connected to the support part 230 through a pin shaft.

Specifically, as follows, the evacuation tube 700 is inserted into the upper cavity 101 of the vacuum jacket 100, the pressure ring 400 is pushed to move down along the upper cavity 101 of the vacuum jacket 100, the pressure ring 400 drives the valve element 300 to move up through the first connecting rod 611, the second connecting rod 612, and the third connecting rod 613, so as to drive the sealing portion 310 to move up, so that the sealing portion 310 is disconnected from the connection with the air port 210, and the air port 210 is opened. The evacuation tube 700 is taken out from the upper cavity 101 of the vacuum jacket 100, the first elastic member 500 elastically resets to push the pressure ring 400 to move upwards along the upper cavity 101 of the vacuum jacket 100, so that the pressure ring 400 returns to the initial position, the pressure ring 400 drives the valve element 300 to move downwards through the first connecting rod 611, the second connecting rod 612 and the third connecting rod 613, and the external atmospheric pressure pushes the sealing part 310 to move downwards, the sealing part 310 seals and blocks the air port 210, and the air port 210 is closed.

(first embodiment: it is suggested that it is not necessary to define the displacement reversal set rod 600 as a specific structure). in a specific embodiment, the distance between the first end 612a of the second link 612 and the support part 230 is smaller than the distance between the second end 612b of the second link 612 and the support part 230, due to the lever principle, the stroke of the pressing ring 400 moving down along the upper chamber 101 is smaller than the stroke of the valve element 300 moving up, so that the sealing part 310 moves up a sufficiently large stroke, and the distance between the sealing part 310 and the air port 210 is large, the opening is large, and the efficiency is high when vacuum is pumped.

External force promotes promptly the clamping ring 400 is followed the epicoele 101 moves down, and clamping ring 400 passes through reverse group pole 600 of displacement drives the case and shifts up for the case has bigger ascending displacement, makes the sealing portion of case break away from to be connected with the gas port, and guarantees to have enough big evacuation passageway, improves evacuation efficiency.

In other embodiments, the distance between the first end 612a of the second link 612 and the support portion 230 is greater than the distance between the second end 612b of the second link 612 and the support portion 230, and due to the lever principle, the downward movement stroke of the press ring 400 along the upper cavity 101 is greater than the upward movement stroke of the valve element 300, so that the press ring 400 can be pushed by the vacuum tube 700 with relatively small force to drive the valve element 300 to move upward, thereby facilitating the insertion of the vacuum tube 700 into the upper cavity 101 of the vacuum jacket 100 for convenient operation.

Referring to fig. 2 and 4, the diameter of the lower end of the valve core seat 200 is reduced to form a mounting portion 240, at least one side opening 250 is formed between the gas port 210 and the mounting portion 240 of the valve core seat 200, the side opening 250 is communicated with the gas port 210, and the gas port 210 is communicated with the lower cavity 102 of the vacuum jacket 100 through the side opening 250. The lower end of the valve body 300 is movably connected to the mounting portion 240.

Further, referring to fig. 2, 4 and 5, the mounting portion 240 is provided with a connection hole 241 coaxially formed with the gas port 210, and the lower end of the valve body 300 is movably inserted into the connection hole 241 and coaxially formed with the connection hole 241. The lower end of the valve core 300 is provided with a connecting piece 330, a second elastic piece 900 is arranged between the connecting piece 330 and the mounting part 240, two ends of the second elastic piece 900 are respectively abutted to the connecting piece 330 and the mounting part 240, when the valve core 300 moves upwards, the second elastic piece 900 is compressed, and the second elastic piece 900 is used for driving the sealing part 310 to be connected with the air port 210 in a sealing manner. Specifically, the second elastic member 900 is a spring, and the spring is sleeved on the valve element 300.

Preferably, referring to fig. 2 and 3, the connecting member 330 is a nut that is screwed to the lower end of the valve core 300, and the distance between the nut and the mounting portion 240 is adjusted by rotating the nut to move up or down along the valve core 300, so as to adjust the pre-tightening force of the second elastic member 900, and thus the second elastic member 900 is under the appropriate pre-tightening force.

Specifically, when the evacuation tube 700 is taken out from the upper chamber 101 of the vacuum jacket 100, the valve element 300 is subjected to three forces in the same direction, namely the first elastic member 500, the second elastic member 900 and the external atmospheric pressure, so as to provide sufficient force for resetting the valve element 300, ensure that the sealing portion 310 tightly blocks the air port 210, and ensure high reliability of the sealing force and reliable operation.

Referring to fig. 2 and 3, a first mounting table 130 is convexly disposed on an outer wall of an open end of an upper chamber 101 of the vacuum jacket 100, an accommodating groove 131 is dug in an end surface of the first mounting table 130, and the accommodating groove 131 is coaxially disposed with the upper chamber 101. The outer wall of the evacuation tube 700 is convexly provided with a second mounting platform 710, the second mounting platform 710 is accommodated in the accommodating groove 131 in a matching manner when the evacuation tube 700 is inserted into the upper cavity 101 of the vacuum jacket 100, and the first mounting platform 130 and the second mounting platform 710 are locked by the fast fastening mechanism 800, so that the vacuum jacket 100 and the evacuation tube 700 are fastened and connected, and the connection is firm and the installation is convenient.

Wherein the quick fastening mechanism 800 is well-established prior art, such as: fast-assembling clamp, clamp joint, vacuum clamp etc. all can regard as quick fastening device 800, come first mount table 130 and second mount table 710 of high-speed joint, easy operation.

Further, referring to fig. 2 and 3, the first mounting block 130 is adapted to cover a dust cap 140 to prevent dust from the environment from entering the upper chamber 101 of the vacuum jacket 100. When the vacuum is pumped, the dust cover 140 is taken down, the vacuum pumping is finished, and the dust cover 140 is covered.

In the present invention, referring to fig. 6, there is provided an operation method for the above-mentioned external pressure container vacuumizing self-sealing interface, wherein the vacuum jacket 100 is installed on the air pipe of the vacuum cavity of the cryothermal insulation gas cylinder; the method comprises the following steps:

s100: providing a vacuumizing device, inserting a vacuumizing tube 700 of the vacuumizing device into an upper end hole of the vacuum jacket 100, pushing the pressure ring 400 to move downwards by the vacuumizing tube 700, opening the air port 210, and communicating the vacuum cavity with the vacuumizing device;

s200: providing a quick fastening mechanism 800, fastening and connecting the vacuum-pumping pipe 80 and the vacuum jacket 100 through the quick fastening mechanism 800, and starting the vacuum-pumping device to pump vacuum;

s300: after the vacuum degree in the vacuum chamber reaches a predetermined value, the quick fastening machine 800 is unscrewed, the evacuation tube 700 is taken off from the vacuum jacket 100, the first elastic member 500 drives the sealing part 310 to seal and block the air port 210 by the elastic resetting force and the pressure of the external atmospheric pressure, so that the air port 210 is automatically closed, the vacuum chamber is isolated from the outside, and the evacuation is completed.

Therefore, the operation method of the vacuumizing self-sealing interface of the external pressure container provided by the invention has one of the following technical effects: the operation steps of vacuumizing the vacuum cavity of the low-temperature heat-insulation gas cylinder are simple, the operation error rate is reduced, the vacuumizing operation time is shortened, and the vacuumizing efficiency is improved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the present invention pertains, the architecture form can be flexible and varied without departing from the concept of the present invention, and a series of products can be derived. But rather a number of simple derivations or substitutions are made which are to be considered as falling within the scope of the invention as defined by the appended claims.

Claims (10)

1. The vacuumizing self-sealing interface of the external pressure container is characterized by comprising a vacuum jacket, a valve core seat, a valve core, a pressure ring, a displacement reversal group rod, a first elastic piece and a second elastic piece; the valve core seat is arranged in the vacuum jacket and is provided with an air port; the valve core is arranged in the air port in a penetrating way, and is provided with a sealing part matched with the air port; the compression ring is movably arranged in an upper end hole of the vacuum jacket, a plurality of displacement reverse assembly rods are annularly and uniformly distributed between the compression ring and the valve core, and the compression ring is pushed to drive the sealing part to be separated from being connected with the air port; the first elastic piece and the second elastic piece are arranged in the vacuum clamping sleeve, and when the compression ring is released to push, the first elastic piece and the second elastic piece drive the sealing part to be in sealing connection with the air port through the displacement reverse assembly rod.

2. The evacuated self-sealing interface for an external pressure vessel of claim 1, wherein: an annular limiting table extends from the inner wall of the middle part of the vacuum jacket, a boss extends from the upper end of the valve core seat, the lower end of the valve core seat penetrates through an annular hole of the annular limiting table, and the boss is in limit abutment with the annular limiting table; the air port penetrates through the boss and is communicated with the lower end of the vacuum jacket.

3. The evacuated self-sealing interface for an external pressure vessel of claim 2, wherein: the boss is cylindrical, the outer wall of boss is equipped with the external screw thread, the inner wall that the vacuum jacket was in the top of annular spacing platform is equipped with the internal thread, external screw thread adaptation connect in the internal thread.

4. The evacuated self-sealing interface for an external pressure vessel of claim 1, wherein: the diameter of one end, close to the pressure ring, of the air port is increased gradually to form a conical groove, the sealing part is conical, and the sealing part is accommodated in the conical groove in a matched mode.

5. The external pressure vessel vacuumizing self-sealing interface according to any one of claims 1-4, characterized in that: the first elastic piece is a spring; the first elastic piece is arranged between the pressing ring and the valve core seat, and two ends of the first elastic piece are respectively abutted to the pressing ring and the valve core seat.

6. The external pressure vessel vacuumizing self-sealing interface according to any one of claims 1-4, characterized in that: the displacement reverse group rod comprises a first connecting rod, a second connecting rod and a third connecting rod; the first end of the first connecting rod is rotatably connected with the pressing ring, the first end and the second end of the second connecting rod are respectively rotatably connected with the second end of the first connecting rod and the first end of the third connecting rod, and the second end of the third connecting rod is rotatably connected with the upper end of the valve core; the upper end of the valve core seat is convexly provided with a supporting part at the side of the air port, and the middle part of the second connecting rod is rotatably connected with the supporting part.

7. The evacuated self-sealing interface for an external pressure vessel of claim 6, wherein: the distance between the first end of the second link and the support portion is smaller than the distance between the second end of the second link and the support portion.

8. The external pressure vessel vacuumizing self-sealing interface according to any one of claims 1-4, characterized in that: the diameter of the lower end of the valve core seat is reduced to form an installation part, at least one side opening is formed between the air port and the installation part of the valve core seat, and the side opening is communicated with the air port; the lower end of the valve core is movably connected with the mounting part.

9. The evacuated self-sealing interface for an external pressure vessel of claim 8, wherein: the mounting part is provided with a connecting hole which is coaxial with the air port in a penetrating way, and the lower end of the valve core movably penetrates through the connecting hole; the lower end of the valve core is provided with a connecting piece, the second elastic piece is arranged between the connecting piece and the installation part, and the second elastic piece is used for driving the sealing part to be connected with the air port in a sealing mode.

10. An operation method for vacuumizing the external pressure container from the sealing interface as claimed in any one of claims 1 to 9, wherein the vacuum jacket is arranged on a gas pipe of a vacuum cavity of the cryogenic insulation gas cylinder; the method is characterized in that: the method comprises the following steps:

s100: providing a vacuumizing device, inserting a vacuumizing tube of the vacuumizing device into an upper end hole of the vacuum jacket, pushing the compression ring to move downwards by the vacuumizing tube, opening the air port, and communicating the vacuum cavity with the vacuumizing device;

s200: providing a quick fastening mechanism, fastening and connecting the vacuum-pumping pipe and the vacuum jacket through the quick fastening mechanism, and starting the vacuum-pumping device;

s300: and after the vacuum degree in the vacuum cavity reaches a preset value, unscrewing the quick fastening machine, taking the vacuum-pumping pipe down from the vacuum jacket, and driving the sealing part to seal and block the air port by the first elastic piece.

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