CN115289230A

CN115289230A - Sealing door and vacuum isolation cabin door

Info

Publication number: CN115289230A
Application number: CN202210963537.2A
Authority: CN
Inventors: 段启刚; 李剑; 江涛
Original assignee: China Erzhong Group Deyang Heavy Industries Co Ltd
Current assignee: China Erzhong Group Deyang Heavy Industries Co Ltd
Priority date: 2022-08-11
Filing date: 2022-08-11
Publication date: 2022-11-04

Abstract

The invention relates to a sealing door and a vacuum isolation cabin door, wherein the sealing door is provided with an end face sealing ring, a radial sealing ring and at least one first through hole, the end face sealing ring is arranged on one side of the sealing door, the radial sealing ring is arranged on the outer ring surface of the sealing door, the first through hole is communicated with two sides of the sealing door, the outer ring surface of the sealing door is in sliding fit in a mounting hole of a valve plate, the radial sealing ring is tightly attached to the mounting hole, and the end face sealing ring is used for being attached to a sealing end face. In the process from closing to opening or from opening to closing, the sealing door is communicated front and back, the pressure difference of the two vacuum pipelines directly acts on the valve plate instead of the sealing door, so that the force for opening and closing the sealing door is small, namely, the sealing door can be pushed by a driving part with small driving force, the end face sealing ring is close to or far away from the sealing end face, the manufacturing cost of the sealing door, the driving part and the valve plate can be reduced, and the sealing door is simple in structure, convenient to use and good in effect.

Description

Sealing door and vacuum isolation cabin door

Technical Field

The invention relates to the field of vacuum magnetic suspension, in particular to a sealing door and a vacuum isolation cabin door.

Background

The fluid conveying pipeline system is usually opened and closed by gate valves, stop valves, butterfly valves, ball valves, plug valves and the like, and the valves are widely used for conveying pipeline systems of liquid water, liquid oils, gaseous materials, fluidized materials and the like.

At present, most of valves are single-station switch valves, the drift diameter of a pipeline is small, a pipeline system cannot carry out conveying of magnetic suspension vehicles or solid materials and the like, and the valves are switched on and off in the conveying process.

At present, a switch valve used for a tangible object to pass through is a flashboard cut-off valve, a gate valve is an opening-closing type flashboard, and the moving direction of the gate valve is vertical to the moving direction of the object. The gate valve has two types, namely a wedge-shaped gate valve and a parallel gate valve.

Two sealing faces of the wedge-shaped flashboard form a wedge shape, the wedge-shaped sealing face and the valve body sealing face are guaranteed to be sealed by the aid of the valve rod thrust, the wedge-shaped sealing face of the wedge-shaped flashboard and the valve body is high in processing requirement and easy to wear, the valve rod thrust is required to be kept constant for a long time, the wedge-shaped flashboard cut-off valve is only suitable for flashboard cut-off valves with medium and small drift diameters, and the requirements for opening and closing and sealing of vacuum magnetic suspension vacuum pipelines cannot be met.

The sealing surface of the parallel gate valve is parallel to the moving direction of the gate, the parallel gate valve mainly comprises a gate, a sealing device, a sealing executing mechanism, a gate moving mechanism, a valve body and the like, the movement of the gate is realized through the rotation of a trapezoidal thread lead screw nut pair, the driving of the gate is manual or electric, and the gate is driven electrically to move to an opening position and a closing position. The parallel gate valve is sealed by pushing out the sealing plate in parallel through a plurality of groups of parallel four-bar mechanisms consisting of an ejector rod mechanism of the sealing executing mechanism, an inclined bar mechanism and a sealing plate of the sealing device, wherein the inclined bar mechanism is inclined to be vertical until a sealing ring on the sealing plate is abutted to the sealing end face of the valve body, the requirement on sealing force is met and maintained, and the gate valve is sealed and closed; the sealing actuating mechanism is also driven by a trapezoidal thread lead screw nut pair.

In order to ensure the reliable and stable operation of the sealing device, the sealing executing mechanism, the gate plate and the moving mechanism, the following steps are also required to be set: the valve plate comprises (1) a plurality of groups of panel supporting wheels and side plate guide wheels, wherein the valve plate is ensured to stably move in the valve body by taking the valve body or a guide rail as a guide, (2) a plurality of groups of idler wheels are arranged on the valve plate, when the valve plate moves to a valve port, the idler wheels of the valve plate are in place, and the valve plate stops moving forwards, (3) a plurality of groups of sealing plate wheels are used for guiding a sealing plate, and (4) a valve plate bearing wheel and a guide wheel group are used for bearing the weight of the whole valve plate and installing mechanisms on the valve plate.

Therefore, the parallel gate valves have multiple mechanisms, complex structure, high processing and manufacturing difficulty, high cost and high failure rate; the sealing device and the sealing executing mechanism are arranged in the flashboard, and the maintenance, the repair and the replacement are unchanged after the fault occurs; the opening and closing of the sealing device are realized by adopting a plurality of groups of parallel four-bar mechanisms and a plurality of groups of panel supporting wheels, and because the processing, the manufacturing and the installation are inevitable, errors exist, and the conversion links are more, the flatness of a sealing surface of a sealing plate is lower, the sealing effect is not ideal, and the sealing and opening requirements of the large magnetic suspension vacuum pipeline are difficult to meet.

In view of the prior art of various switch block valves at present, for the special working conditions that the existing sealed working environment is vacuum, the passing maglev train is large-sized tangible solid, the diameter of the vacuum pipeline is large (generally 3 m-8 m), the sealing performance is high, and the like, the sealing problem and a plurality of defects exist in the existing gate valve sealing structure technology, and in the prior art, the sealing force or the pressure difference when the sealing door is opened and closed completely acts on the sealing door, so that the structure of an actuating mechanism for opening and closing the sealing door is larger, the provided force is larger, the structure for bearing the sealing door and the actuating mechanism is also larger, and the economy is low.

Disclosure of Invention

The invention aims to: the sealing door and the vacuum isolation cabin door are provided aiming at the problems that the structural characteristics and the defects of the existing gate valve technology are overcome, the large-scale operation is difficult, the sealing and opening requirements of a magnetic suspension vacuum pipeline are difficult to meet, and especially the sealing force or the pressure difference when the sealing door is opened and closed completely acts on the sealing door, so that the structure of an actuating mechanism for opening and closing the sealing door is large, the provided force is large, the structures for bearing the sealing door and the actuating mechanism are also large, and the economy is low.

In order to achieve the purpose, the invention adopts the technical scheme that:

a sealing door is provided with an end face sealing ring, a radial sealing ring and at least one first through hole, the end face sealing ring is arranged on one side of the sealing door, the radial sealing ring is arranged on the outer ring face of the sealing door, the first through hole is communicated with the two sides of the sealing door, the outer ring face of the sealing door is in sliding fit with a mounting hole of a valve plate, the radial sealing ring is tightly attached to the mounting hole, and the end face sealing ring is used for being attached to a sealing end face.

By adopting the sealing door, the sealing door is communicated from front to back in the process from closing to opening or from opening to closing of the vacuum isolation cabin door, the pressure difference of the two vacuum pipelines directly acts on the valve plate instead of the sealing door, so that the force for opening and closing the sealing door is small, namely the sealing door can be pushed by a driving part with small driving force, the end face sealing ring is close to or far away from the sealing end face, the manufacturing cost of the low sealing door, the driving part and the valve plate can be reduced, and the sealing door is simple in structure, convenient to use and good in effect.

Preferably, at least one of the two sides of the radial sealing ring is provided with a guide ring.

By adopting the structure, the guide ring plays a role in guiding the axial movement of the sealing door in the mounting hole, supports the sealing door, plays a role in protecting the radial sealing ring, and can also reduce the friction resistance.

Further preferably, the guide ring is arranged on both sides of the radial seal ring.

Further preferably, the guide ring is an easily-sliding wear-resistant piece.

Further preferably, the guide ring is a teflon plate.

Further preferably, the sealing door includes a sealing ring and a sealing flange, the sealing flange is connected to an end of the sealing ring, the sealing ring and the sealing flange form a member with an L-shaped cross section, an outer annular surface of the sealing ring is slidably connected to the mounting hole, and the radial sealing ring and the guide ring are disposed on the outer annular surface of the sealing ring.

Further preferably, an installation groove is formed in the outer ring surface of the sealing ring, and the radial sealing ring and the guide ring are arranged in the installation groove.

Further preferably, the sealing ring and the sealing flange are an integrally formed member.

Further preferably, a grid structure is connected in the sealing ring, and the first through hole is arranged on the grid structure.

By adopting the structure, the grid structure enhances the rigidity of the sealing ring, so that the sealing door is not easy to deform and has good sealing effect, and the material for manufacturing the sealing door is also saved.

Further preferably, a step positioning groove is formed in the sealing flange, and the end face sealing ring is arranged in the step positioning groove.

By adopting the structure, the end face sealing ring is positioned and limited by the step positioning groove.

Further preferably, the inner ring of the end face seal ring is sleeved on the stepped surface of the stepped positioning groove, and the outer ring of the end face seal ring is matched with the sealing compression ring.

By adopting the structure, the sealing pressure ring is used for ensuring that the end face sealing ring can normally work and is not crushed by the sealing end face.

Further preferably, the end face seal ring may be a trapezoidal seal ring, an O-ring seal ring or other seal ring

Preferably, a first driving mechanism is arranged on the plate surface on one side of the valve plate and connected with the sealing door, and the first driving mechanism is used for driving the sealing door to be close to or far away from the valve plate.

Further preferably, a spring is arranged between the sealing door and the valve plate, the spring is pre-compressed and installed, and the spring and the end face sealing rings are respectively arranged on two sides of the sealing door.

Further preferably, two ends of the spring respectively act on the sealing door and the first driving mechanism, the end face sealing ring is tightly attached to the sealing end face through the spring force of the spring to form a normally closed structure, and the first driving mechanism can drive the sealing door to compress the spring and keep away from the sealing end face.

By adopting the structure, the end face sealing ring is pressed on the sealing end face only through the spring force provided by the spring without the work of a first driving mechanism, so that the normal close of the vacuum isolation cabin door is realized, and the use cost can be effectively saved.

Further preferably, when a normally closed structure is adopted, a pull rod is arranged on the valve plate and connected to the sealing door, a spring guide sleeve is sleeved outside the pull rod, the spring guide sleeve is arranged outside the spring guide sleeve, the first driving mechanism comprises a plurality of air cylinders or hydraulic cylinders, the air cylinders or the hydraulic cylinders are uniformly distributed in the circumferential direction of the sealing door, cylinder bodies of the air cylinders or the hydraulic cylinders are connected to the valve plate, and piston rods of the air cylinders or the hydraulic cylinders are connected to the pull rod.

Further preferably, when a normally closed structure is adopted, one end of the pull rod is connected with the end part of the piston rod of the air cylinder or the hydraulic cylinder, two ends of the spring are respectively used for the sealing door and the end part of the cylinder body of the air cylinder or the hydraulic cylinder, the end part of the piston rod of the air cylinder or the hydraulic cylinder is provided with a groove body, and the end part of the pull rod extends into the groove body and is hinged with the end part of the piston rod of the air cylinder or the hydraulic cylinder.

By adopting the structure, the pull rod is used as a guide piece of the spring guide sleeve, and the spring guide sleeve is used as a guide barrel of the spring, so that the problems that the radial deformation of the spring is large, the stability of the spring force is influenced, and the service life of the spring is influenced are avoided; the pull rod, the spring guide sleeve, the spring and the air cylinder or the hydraulic cylinder form a single actuating mechanism for movement of the sealing door, the pull rod is driven by the air cylinder or the hydraulic cylinder, the spring guide sleeve axially guides the spring and limits the elastic deformation direction of the spring at the same time, the spring pushes the sealing door to the sealing end face, the end face sealing ring is attached to the sealing end face, sealing and isolating are achieved, and normally closing of a cabin door is achieved; the air cylinder or the hydraulic cylinder pulls the sealing door through the pull rod, the sealing door is far away from the sealing end surface until the sealing door is attached to the valve plate, and the sealing door and the sealing end surface form a design interval to realize normal opening of the cabin door; the air cylinder or the hydraulic cylinder adopts the same air source or hydraulic oil source to simultaneously supply air or oil through the same pipeline system, so that the consistency and stability of the force transmission size and direction of each actuating mechanism are ensured, the stress of the sealing door along the circumference is balanced, and the sealing effect is good; the pull rod has certain deflection relative to the piston rod of the air cylinder or the hydraulic cylinder, so that the sealing door is more convenient to connect and cooperate, and the bearing force of the sealing door can be uniformly and adaptively applied to the sealing end surface.

Further preferably, the end part of the piston rod of the air cylinder or the hydraulic cylinder at the groove body is provided with a pin hole, the end part of the pull rod is arranged in the pin hole matched with the pull rod, and the pin holes are spliced through cylindrical pins.

Preferably, the two ends of the spring are respectively acted on the end faces of the pipe end flange and the pull rod spline disc, the sealing door is tightly attached to the valve plate through the spring force of the spring, a gap is formed between the plane where the end face sealing ring and the sealing end face are located, a normally open structure is formed, and the first driving mechanism can drive the spring guide sleeve to push the sealing door to be close to the sealing end face, so that the end face sealing ring is attached to the sealing end face.

By adopting the structure, an additional electric control driving structure is not needed, the sealing door is attached to the valve plate only through the spring force provided by the spring, the normally open of the vacuum isolation cabin door is realized, and the use cost can be effectively saved.

Further preferably, when adopting normally open structure, be equipped with the pull rod on the valve plate, the pull rod connect in sealing door, the pull rod overcoat has connect the spring guide pin bushing, the spring housing is located outside the spring guide pin bushing, first actuating mechanism includes a plurality of cylinder or pneumatic cylinder, cylinder or pneumatic cylinder are followed the circumference equipartition of sealing door, the cylinder body of cylinder or pneumatic cylinder connect in the valve plate, be equipped with the pipe end flange on the valve plate, the pipe end flange is located sealing door one side, the pull rod includes spline dish and the body of rod, a body structure is constituteed to spline dish and the body of rod, the spring guide pin bushing cover is located outside the body of rod, the spring housing is located outside the spring guide pin bushing.

Preferably, when a normally open structure is adopted, spline grooves matched with the spring guide sleeve are formed in the spline disc, spline teeth matched with the spline grooves of the spline disc are arranged at one end of the spring guide sleeve, the spline teeth penetrate through the spline grooves of the spline disc and abut against the piston rod end of the air cylinder or the hydraulic cylinder and are in matched connection with the piston rod end, the other end of the spring guide sleeve penetrates through and is connected with the pipe end flange and abuts against the sealing door in a sliding mode, one end of the spring abuts against the pipe end flange, the other end of the spring abuts against the spline disc, the sealing door pushes the pull rod under the spring force action of the spring to pull the sealing door to abut against the pipe end flange and to be far away from the sealing end face, a normally open structure is formed, and the piston rod of the air cylinder or the hydraulic cylinder can push the spring guide sleeve to move axially and push the sealing door to move towards the sealing end face.

Further preferably, a plurality of springs are uniformly distributed along the circumferential direction of the sealing door.

By adopting the structure, the springs which are uniformly distributed act on the periphery of the sealing door, so that uniform spring force can be provided for the sealing door and is matched on the valve plate.

Further preferably, the pull rod penetrates through the rear outer side of the sealing door and is connected with a locking nut and locked.

Further preferably, the sealing door further comprises a pipe, wherein the pipe comprises a circular ring pipe and a hose, the circular ring pipe is connected with all the cylinders or the hydraulic cylinders at the same time, the hose is connected with the circular ring pipe, and the hose is connected with a gas station or a hydraulic station.

The invention also provides a vacuum isolation cabin door which comprises a box body and the sealing door, wherein end face flanges are arranged on two sides of the box body and are respectively connected with the vacuum pipelines in a sealing mode, the two vacuum pipelines are coaxially arranged, the top and the bottom of the valve plate are respectively provided with a convex block, a sliding groove is arranged in the box body, the convex blocks are arranged in the sliding groove and are matched to form a sliding guide pair, the plate face of the valve plate can move to or far away from the position between the two vacuum pipelines, and the sealing end face is arranged in the box body.

By adopting the vacuum isolation cabin door, the bump is arranged in the sliding chute and matched with the sliding guide pair, the axial positioning precision is high, and the axial sealing thrust for pushing the sealing door to move and the differential pressure thrust of the vacuum pipeline are borne, so that the problems of small axial bearing force and low positioning precision of a wheel type guiding device adopted in the prior art are solved; the vacuum isolation cabin door is simple in structure, convenient to use and good in effect.

Preferably, the sliding groove is U-shaped.

Preferably, the sliding groove is formed along a length direction of the case.

Preferably, the vacuum insulated door further comprises a second drive mechanism, said second drive mechanism driving said valve plate to slide within said box.

Further preferably, the second driving mechanism is a screw rod system, an oil cylinder system, an air cylinder system, a belt pulley system, a gear rack system or a chain wheel and chain system, the screw rod system, the oil cylinder system, the air cylinder system, the belt pulley system, the gear rack system or a fixing part of the chain wheel and chain system is connected to the box body, and the screw rod system, the oil cylinder system, the air cylinder system, the belt pulley system, the gear rack system or a moving part of the chain wheel and chain system is connected to the valve plate.

Further preferably, the lead screw system includes lead screw and driver, the driver is located outside the box and sealed the fixing on the box, the lead screw connect in the box, the driver connect in the one end of lead screw can drive the lead screw rotates, lead screw threaded connection has lead screw nut, lead screw nut connects the valve plate, the lead screw is followed the valve plate slip direction sets up.

By adopting the structure, the screw rod is driven to rotate by the rotation of the driver, and the screw rod drives the screw rod nut to do linear reciprocating motion along the screw rod, so that the valve plate is driven to slide in the box body.

Further preferably, the lead screw system further comprises a rotary encoder, the rotary encoder is connected in the box body, and the rotary encoder is connected to the other end of the lead screw.

By adopting the structure, the rotary encoder measures the angular displacement or the angular speed of the rotation of the lead screw, and the moving distance of the lead screw nut is controlled by matching with the thread pitch of the lead screw, namely the moving distance and the accurate positioning of the valve plate can be accurately controlled.

Further preferably, the driver is connected to one end of the lead screw through a coupler, and the other end of the lead screw is connected to the rotary encoder through a coupler.

Further preferably, the lead screw is mounted in the box body through two lead screw bearing blocks, and the lead screw is supported by the lead screw bearing blocks.

Further preferably, the lead screw nut is connected with the nut bearing seat, and the nut bearing seat is connected with the valve plate.

Further preferably, the driver is a motor.

Preferably, a limit sensor is arranged on the abutting surface of the sealing end surface, and the limit sensor is a proximity switch, a limit switch or other position detection sensors.

By adopting the structure, the limit sensor is used for detecting the approaching degree of the sealing door and preventing the sealing end face and the sealing flange from crushing the end face sealing ring.

Preferably, the convex part of lug has three working faces, is provided with a set of slide on every working face, and every group slide includes a plurality of, the slide fits in the spout.

Further preferably, the sliding plates are arranged uniformly.

Further preferably, the slide plate is mounted on the boss by a fastener.

Further preferably, the sliding plate is a wear-resistant lubricating lining plate.

Further preferably, the sliding plate is a self-lubricating wear-resistant lining plate.

Preferably, the box is equipped with three independent station in proper order, be located the station in the middle of be with the box intercommunication station of vacuum pipe intercommunication, box intercommunication station both sides are for holding respectively the stop station of valve plate, box intercommunication station distributes both sides around the box, and the coaxial line sets up, box intercommunication station be with vacuum pipe has the pipe of the same internal diameter, box intercommunication station orientation one side of valve plate sets up sealing end face.

Further preferably, a box body mounting table is arranged at the bottom of the circular tube of the box body communication station and used for mounting a magnetic suspension track and a motor support of a linear motor stator acting on magnetic suspension.

Further preferably, the valve plate is provided with two independent stations in sequence, one is a valve plate sealing station, the other is a valve plate communicating station, the valve plate communicating station is a circular pipe with the same inner diameter as the box body communicating station, and the valve plate sealing station is provided with the sealing door.

By adopting the structure, the valve plate moves once in the box body, so that the valve plate sealing station is aligned with the box body communication station, the valve plate communication station is far away from the box body communication station, and the two vacuum pipelines are separated.

Further preferably, a valve plate mounting table is arranged at the bottom of the circular tube of the valve plate communication station and used for mounting a magnetic suspension track and a motor support of a linear motor stator acting on magnetic suspension.

Preferably, the box includes first half box, latter half box and end cover, first half box with latter half box sealing connection, to closing the face and being equipped with the box sealing member, first half box with latter half box with same one end with end cover sealing connection, to closing the face and being equipped with the end cover sealing member, box sealing member and end cover sealing member are bar sealing member or board type sealing member etc..

Further preferably, the front half box body, the rear half box body and the end cover are positioned by adopting rabbets among the combining surfaces.

The invention also provides a vacuum isolation cabin door with bidirectional sealing, which comprises the vacuum isolation cabin door, wherein two sealing doors are respectively arranged on two sides of a valve plate sealing station of the valve plate, and the two sealing doors are respectively used for sealing the corresponding vacuum pipelines.

By adopting the two-way sealed vacuum isolation cabin door, the two vacuum pipelines connected with the box body are respectively sealed through the two sealing structures, so that the two-way sealed vacuum isolation cabin door has better sealing performance, when the sealing of a single sealing structure fails due to the occurrence of a problem, the other sealing structure can still effectively seal and separate the two adjacent vacuum pipelines, and a reliable vacuum environment is provided for a vacuum pipeline system; in addition, the spring force of the spring or the driving force of the first driving mechanism in the two sealing structures are opposite in direction, the spring force acting on the valve plate or the driving force of the first driving mechanism can be well offset, so that the axial thrust borne by the valve plate and the box body matched sliding guide pair is greatly reduced or even eliminated, and the vacuum isolation cabin door is simple in structure, convenient to use and good in effect.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. according to the sealing door, the front and back of the sealing door are communicated in the process from closing to opening or from opening to closing of the vacuum isolation cabin door, the pressure difference of the two vacuum pipelines directly acts on the valve plate instead of the sealing door, so that the force for opening and closing the sealing door is small, namely the sealing door can be pushed by a driving part with small driving force, the end face sealing ring is close to or far away from the sealing end face, the manufacturing cost of the low sealing door, the driving part and the valve plate can be reduced, and the sealing door is simple in structure, convenient to use and good in effect;

2. according to the vacuum isolation cabin door, the bump is arranged in the sliding chute and is matched with the sliding guide pair, the axial positioning precision is high, and the axial sealing thrust for pushing the sealing door to move and the differential pressure thrust of the vacuum pipeline are borne, so that the problems of small axial bearing force and low positioning precision of a wheel type guiding device in the prior art are solved; the vacuum isolation cabin door has the advantages of simple structure, convenient use and good effect;

3. according to the bidirectional-sealing vacuum isolation cabin door, the two vacuum pipelines connected with the box body are respectively sealed through the two sealing structures, so that the better sealing performance is achieved, when a single sealing structure fails to cause sealing failure, the other sealing structure can still effectively seal and separate the two adjacent vacuum pipelines, and a reliable vacuum environment is provided for a vacuum pipeline system; in addition, the spring force of the spring or the driving force of the first driving mechanism in the two sealing structures are opposite in direction, the spring force acting on the valve plate or the driving force of the first driving mechanism can be well offset, so that the axial thrust borne by the valve plate and the box body matched sliding guide pair is greatly reduced or even eliminated, and the vacuum isolation cabin door is simple in structure, convenient to use and good in effect.

Drawings

FIG. 1 is a schematic sectional view of a normally closed one-way vacuum isolation door in a normally closed state;

FIG. 2 is a schematic cross-sectional view of the one-way normally closed vacuum isolation door in an open state;

FIG. 3 is a schematic top view of a one-way normally closed vacuum isolation door;

FIG. 4 isbase:Sub>A schematic cross-sectional view of A-A of FIG. 1;

FIG. 5 is an enlarged view of the portion D in FIG. 4;

FIG. 6 is a schematic cross-sectional view of B-B in FIG. 2;

FIG. 7 is a schematic cross-sectional view of C-C of FIG. 2;

FIG. 8 is a schematic longitudinal cross-sectional view of a bi-directional normally closed vacuum isolation door in a normally closed position;

FIG. 9 is an enlarged view of the section E in FIG. 8;

FIG. 10 is a schematic sectional view of the normally open state of the normally open vacuum isolation hatch;

FIG. 11 is a schematic cross-sectional view of the vacuum isolation hatch in a closed state;

FIG. 12 is a schematic top view of the vacuum isolation hatch with a normally open one-way configuration;

FIG. 13 is a schematic sectional view of A '-A' in FIG. 10;

FIG. 14 is a schematic sectional view of B '-B' in FIG. 10;

FIG. 15 is a schematic sectional view of C '-C' in FIG. 11;

FIG. 16 is an enlarged view of the portion D' of FIG. 15;

FIG. 17 is a schematic cross-sectional view of F-F in FIG. 16;

FIG. 18 is a schematic longitudinal sectional view of the two-way normally open vacuum isolation hatch in a closed state;

FIG. 19 is an enlarged view of section E' of FIG. 18;

fig. 20 is a schematic sectional structure view of G-G in fig. 19.

The mark in the figure is: 01-vacuum pipe, 1-box, 11-front half box, 12-rear half box, 13-end cover, 14-box sealing element, 15-end cover sealing element, 16-box communication station, 17-box installation table, 18-sliding chute, 19-sealing end face, 191-limit sensor, 2-valve plate, 21-valve plate sealing station, 211-ring pipe, 212-pipe end flange, 22-valve plate communication station, 23-sealing door, 231-first through hole, 232-radial sealing ring, 233-guide ring, 234-end sealing ring, 235-sealing press ring, 24-bump, 241-slide plate, 25-cylinder or hydraulic cylinder, 26-pull rod, 261-lock nut, 262-cylindrical pin, 263-spline disk, 264-rod body, 27-spring, 28-spring guide sleeve, 281-spline tooth, 29-valve plate installation table, 3-second driving mechanism, 31-lead screw, 32-driver, 33-lead screw, 34-nut bearing seat, 35-rotary encoder, 4-tubing, 41-circular tube, and 42-circular tube.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

As shown in fig. 1 to 7, the vacuum insulated hatch door of the present invention includes a box 1, a valve plate 2, a second driving mechanism 3, and a pipe 4, and is a normally closed door.

As shown in fig. 1 to 3, the box body 1 comprises a front half box body 11, a rear half box body 12 and an end cover 13, the front half box body 11 and the rear half box body 12 are combined into a right box body through a seam allowance, a combining surface and a bolt handle, a sealing groove is processed on the combining surface, a box body sealing element 14 is installed in the sealing groove, a seam allowance positioned by the end cover 13 and a handle combining surface are processed on the left end surface of the right box body, the right box body and the end cover 13 are connected through the bolt handle, a sealing groove is processed on the handle combining surface, an end cover sealing element 15 is installed in the sealing groove, the front half box body 11 and the rear half box body 12 are respectively connected with a vacuum pipeline 01, and the two vacuum pipelines 01 are aligned. The box sealing member 14 and the end cover sealing member 15 may be sealing strips, or may be other sealing members such as "O" rings, plate type gaskets, etc.

As shown in fig. 1 to 3, the box body 1 is provided with three independent stations, the station located in the middle is a box body communication station 16 communicated with the vacuum pipeline 01, the left and right stations are stop stations for accommodating the valve plate 2, the box body communication stations 16 are distributed on the front side and the rear side of the box body 1, namely, the box body communication stations 16 are respectively arranged on the front half box body 11 and the rear half box body 12, the box body communication stations 16 are round pipes with the same inner diameter as the vacuum pipeline 01, and the two box body communication stations 16 are arranged oppositely and coaxially.

As shown in fig. 4, two ends of the box body communication station 16 are provided with flanges, the flanges facing the outside of the box body 1 are connected with the corresponding vacuum pipes 01 in a sealing manner, an installation space for the valve plate 2 is provided between the flanges facing the inside of the box body 1, a flange surface facing the flanges inside the box body 1 is a sealing end surface 19, a limit sensor 191 is arranged on an adjacent surface of the sealing end surface 19, the limit sensor 191 is a proximity switch, a limit switch or other position detection sensor, and the adjacent surface may be an inner ring surface of the flange or an outer ring surface of the flange.

As shown in fig. 7, a box mounting table 17 is arranged at the bottom of the circular tube of the box communication station 16, and the box mounting table 17 is used for mounting a magnetic suspension track and a motor bracket of a linear motor stator acting on magnetic suspension.

As shown in fig. 1, 2, 4 to 7, the inner top surface and the inner bottom surface of the case 1 are respectively provided with a sliding groove 18 from left to right, that is, the sliding groove 18 is arranged along the length direction of the front half case 11 and the rear half case 12, and the sliding groove 18 is U-shaped.

As shown in fig. 1 and 2, the valve plate 2 is provided with two independent stations from left to right in sequence, one is a valve plate sealing station 21, the other is a valve plate communicating station 22, the valve plate communicating station 22 is arranged on the right side of the valve plate 2, the valve plate communicating station 22 is a circular pipe having the same inner diameter as the tank body communicating station 16, a valve plate mounting table 29 is arranged at the bottom of the circular pipe of the valve plate communicating station 22, the valve plate mounting table 29 is used for mounting a magnetic suspension motor support, the valve plate sealing station 21 is arranged on the left side of the valve plate 2, a sealing door 23 is arranged at the valve plate sealing station 21, and the sealing door 23 on the valve plate 2 and the sealing end face 19 on the tank body 1 are matched with each other to form a sealing structure.

As shown in fig. 4 and 5, the sealing door 23 includes a sealing ring and a sealing flange, the sealing flange is connected to an end portion of the sealing ring, preferably, the sealing ring and the sealing flange are integrally formed members, the sealing ring and the sealing flange form a member with an L-shaped cross section, the valve plate sealing station 21 is formed by assembling and welding a ring pipe 211, an inner web and a rib plate, and an outer web and a rib plate, and is integrally formed with the valve plate 2, a mounting hole for mounting the sealing door 23 is formed in the ring pipe 211, an outer ring surface of the sealing ring is slidably connected to the mounting hole, mounting grooves for a radial sealing ring 232 and a guide ring 233 are formed on an outer ring surface of the sealing ring, the radial sealing ring 232 is mounted in the middle groove, the guide ring 233 is mounted in the mounting grooves on two sides of the radial sealing ring 232, the radial sealing ring 232 is tightly attached to the mounting hole, the guide ring 233 is an easily sliding wear-resistant member, in this embodiment, a teflon plate is used to achieve sealing and isolating between two sides of the mounting hole by the radial sealing ring 232, and the guide ring 233 supports the sealing door in the mounting hole and plays a role in protecting the radial sealing ring 232.

As shown in fig. 5, a lattice structure is arranged in the sealing ring, the lattice structure enhances the rigidity of the sealing ring, so that the sealing door 23 is not easy to deform and has good sealing effect, and the material for manufacturing the sealing door 23 is also saved, the lattice structure is provided with at least one first through hole 231, and the first through holes 231 are communicated with the front side and the rear side of the sealing door 23, so that the sealing door 23 is communicated from front to rear, and the phenomenon that the force generated by the pressure difference between the two sides directly acts on the sealing door 23 when the front side and the rear side are not communicated, which causes the force required for opening and closing the sealing door 23 to be greatly increased and increases the manufacturing cost is avoided.

As shown in fig. 4 and 5, sealing flange is located the mounting hole with between the seal end face 19, sealing flange orientation 19 one side of seal end face is provided with the ladder constant head tank, be provided with end face seal 234 and sealed clamping ring 235 in the ladder constant head tank, end face seal 234's interior snare is located on the ladder face of ladder constant head tank, sealed clamping ring 235 press in end face seal 234's outer loop, sealed clamping ring 235 is used for ensuring end face seal 234 can normally work, be unlikely to by seal end face 19 crushes by pressure, limit sensor 191 is used for detecting the degree of approach of sealing door 23 avoids seal end face 19 with sealing flange will end face seal 234 crushes by pressure.

As shown in fig. 4 and 5, a first driving mechanism is disposed on the valve plate 2, the first driving mechanism includes a plurality of air cylinders or hydraulic cylinders 25, the air cylinders or hydraulic cylinders 25 are uniformly arranged along the circumferential direction of the sealing door 23, as shown in fig. 1 and 2, in this embodiment, 12 air cylinders or hydraulic cylinders 25 are uniformly distributed, an installation spigot is disposed on the valve plate 2, the air cylinders or hydraulic cylinders 25 are fixedly connected to the valve plate 2 through bolts and the installation spigot, a groove body and a pin hole are processed at the end of a piston rod of the air cylinders or hydraulic cylinders 25, an end of the pull rod 26 is inserted into the groove body, a head and a pin hole matched with the end of the piston rod of the air cylinders or hydraulic cylinders 25 are disposed at the end of the pull rod 26, a cylindrical pin 262 is inserted into the pin hole, and the cylindrical pin 262 passes through the head of the pull rod 26, the head of the pull rod 26 is hinged to the end of the piston rod of the cylinder or hydraulic cylinder 25, a second through hole corresponding to the cylinder or hydraulic cylinder 25 is formed in the sealing flange, the other end of the pull rod 26 penetrates through the corresponding second through hole and then is connected with a locking nut 261, the cylinder or hydraulic cylinder 25 pulls the pull rod 26, the pull rod 26 pulls the sealing door 23 through the locking nut 261, a spring guide sleeve 28 is sleeved outside the pull rod 26, a spring 27 is sleeved outside the spring guide sleeve 28, the spring 27 is installed in a pre-compression mode, two ends of the spring 27 are respectively abutted to the end of the sealing flange and the end of the cylinder body of the cylinder or hydraulic cylinder 25, the sealing flange moves rightwards under the action of the pull rod 26 to enable the sealing door 23 to abut to the end face of the annular tube 211, and at the moment, the spring guide sleeve 28 can move axially.

As shown in fig. 1, 2, 4 to 7, the top and the bottom of the valve plate 2 are respectively provided with a protruding block 24, the protruding block 24 is installed in cooperation with a mounting groove on the valve plate 2 through a fastening member, a protruding portion of the protruding block 24 has three working surfaces, each of the working surfaces is provided with a set of sliding plates 241, each set of sliding plates 241 includes a plurality of sliding plates 241, the sliding plates 241 are uniformly arranged and installed on the protruding block 24 through a fastening member, the protruding block 24 is arranged in the sliding groove 18 and is matched to form a sliding guide pair, the sliding plates 241 are attached to the sliding groove 18, and the valve plate 2 and the housing 1 are slidably connected through the matching of the protruding block 24 and the sliding groove 18, the sliding plates 241 are wear-resistant and lubricated lining plates, and in this embodiment, self-lubricating wear-resistant lining plates are adopted; when the valve plate 2 is maintained, the end cover 13 is only required to be opened, and the valve plate 2 is drawn out from one side of the end cover 13 along the sliding groove 18, so that the valve plate 2 is very convenient to maintain.

As shown in fig. 1 to 4, 6 and 7, the second driving mechanism 3 includes a lead screw 31, a driver 32, a lead screw bearing seat 33, a nut bearing seat 34 and a rotary encoder 35, the driver 32 is located outside the end cover 13 and is fixed on the box body 1 in a sealing manner, the driver 32 is connected to one end of the lead screw 31 through a coupling, the other end of the lead screw 31 is connected to the rotary encoder 35 through a coupling, the lead screw 31 is installed in the box body 1 through two lead screw bearing seats 33, the lead screw 31 extends from a staying station of the box body 1 to the box body communicating station 16, the lead screw bearing seat 33 supports the lead screw 31, the lead screw 31 is in threaded connection with a lead screw nut connected to the nut bearing seat 34, the nut bearing seat 34 is connected to the valve plate 2, the driver 32 is a motor, the lead screw 31 is rotated by the rotation of the motor, the lead screw 31 drives the lead screw nut to reciprocate linearly along the lead screw 31, thereby driving the valve plate 2 in the box body 1, the rotary encoder 35 measures the rotation speed or angular displacement of the lead screw 31, controls the lead screw nut to move linearly and the valve plate 21 and the valve plate 22 to be communicated with the valve plate 16 accurately, so that the valve plate 22 can be positioned and the valve plate 22 and the valve plate can be accurately and the valve plate can be communicated with each other accurately.

In some specific embodiments, the second driving mechanism 3 is an oil cylinder system, the oil cylinder system includes a driving oil cylinder, a cylinder body of the driving oil cylinder is hinged in the box body 1, a telescopic rod of the driving oil cylinder is hinged in the valve plate 2, the driving oil cylinder is a servo oil cylinder or an oil cylinder with a linear displacement sensor or an oil cylinder with a pull wire type displacement sensor, and the like, so that the stroke of the telescopic rod of the oil cylinder can be accurately controlled, and the accurate control of the position of the valve plate 2 in the box body 1 is realized; a linear displacement sensor can be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; the valve plate communication station 22 and the valve plate sealing station 21 can be accurately aligned with the box body communication station 16 respectively.

In some specific embodiments, the second driving mechanism 3 is a cylinder system, the cylinder system includes a driving cylinder, a cylinder body of the driving cylinder is hinged in the box 1, a telescopic rod of the driving cylinder is hinged in the valve plate 2, the driving cylinder is a servo cylinder, a cylinder with a linear displacement sensor, a cylinder with a pull wire displacement sensor, or the like, and the stroke of the telescopic rod of the cylinder can be precisely controlled, so as to precisely control the position of the valve plate 2 in the box 1; a linear displacement sensor can be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; the valve plate communication station 22 and the valve plate sealing station 21 can be accurately aligned with the box body communication station 16 respectively.

In some specific embodiments, the second driving mechanism 3 is a belt pulley system, the belt pulley system includes a driving wheel, a driven wheel and a belt, the belt is connected to the driving wheel and the driven wheel, the driving wheel and the driven wheel are connected to the box 1, the belt is connected to the valve plate 2, a shaft of the driving wheel is connected to a motor and a rotary encoder through a coupling, and the rotary encoder is used for detecting and controlling a position of the valve plate 2; a linear displacement sensor can be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; the valve plate communication station 22 and the valve plate sealing station 21 can be accurately aligned with the box body communication station 16 respectively.

In some specific embodiments, the second driving mechanism 3 is a rack and pinion system, the rack and pinion system includes a gear and a rack engaged with the gear, the gear is connected to the housing 1, the rack is connected to the valve plate 2, a shaft of the gear is connected to a motor and a rotary encoder through a coupling, and the rotary encoder is used for detecting and controlling the position of the valve plate 2; a linear displacement sensor can be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; the valve plate communication station 22 and the valve plate sealing station 21 can be accurately aligned with the box body communication station 16 respectively.

In some specific embodiments, the second driving mechanism 3 is a sprocket-and-chain system, the sprocket-and-chain system includes a sprocket and a chain engaged therewith, the sprocket is connected to the box 1, the chain is connected to the valve plate 2, a shaft of the sprocket is connected to a motor and a rotary encoder through a coupling, and the rotary encoder is used for detecting and controlling the position of the valve plate 2; a linear displacement sensor can be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; the valve plate communication station 22 and the valve plate sealing station 21 can be accurately aligned with the box body communication station 16 respectively.

As shown in fig. 1 and 6, the pipe 4 includes a circular pipe 41 and a hose 42, the circular pipe 41 is connected to all the cylinders or hydraulic cylinders 25 at the same time through pipe joints, the box 1 is provided with a box-through joint, the inside of the box-through joint is connected to the hose 42, the outside of the box-through joint is connected to an incoming pipe of a gas station or a hydraulic station, and the hose 42 is connected to the circular pipe 41.

As shown in fig. 1, 4 and 5, in the vacuum isolation hatch, normally, the valve plate sealing station 21 is aligned with the tank body communication station 16, the sealing door 23 is pushed away from the valve plate 2 under the action of the spring force of the spring 27, the end face sealing ring 234 is pressed on the sealing end face 19, and the tank body communication station 16 is sealed and isolated from the front and the back, namely the front and the back vacuum pipelines 01 are isolated and are in a normally closed state; when the front and rear vacuum ducts 01 need to be communicated with each other, the air cylinder or the hydraulic cylinder 25 is operated, the sealing door 23 is pulled toward the valve plate 2 by the piston rod of the air cylinder or the hydraulic cylinder 25 and the pull rod 26, the spring 27 is compressed, the sealing door 23 abuts against the end of the ring tube 211, the end seal 234 is separated from the seal end face 19, the front and rear sealing of the housing 1 is released, the second driving mechanism 3 drives the valve plate 2 to slide in the housing 1, the valve plate sealing station 21 is moved to a stop station in the housing 1, and as shown in fig. 2 and 7, the valve plate communication station 22 is moved to the housing communication station 16 and aligned with each other, and the front and rear vacuum ducts 01 are communicated with each other and opened.

According to the vacuum isolation cabin door, the three independent stations are arranged in the box body 1, the two independent stations are arranged on the valve plate 2, the valve plate 2 is integrally arranged in the box body 1, the joint surfaces of the end cover 13, the front half box body 11 and the rear half box body 12 which form the part of the box body 1 are positioned by adopting the seam allowances, and the box body sealing element 14 and the end cover sealing element 15 are sealed, so that the sealing performance of the vacuum isolation cabin door is ensured, and a reliable vacuum environment is provided for a vacuum pipeline system; when the valve plate 2 is maintained, the valve plate 2 is drawn out from one side of the end cover 13 along the sliding groove 18 only by opening the end cover 13, which is very convenient; two independent stations are arranged on the valve plate 2, the valve plate 2 is driven to move back and forth by the second driving mechanism 3, the reliable switching of the valve plate sealing station 21 and the valve plate communication station 22 at the tank body communication station 16 is realized, and the communication and the sealing closing with the tank body communication station 16 are completed; the first driving mechanism is not needed to work, the end face sealing ring 234 is pressed on the sealing end face 19 only through the spring force provided by the spring 27, so that the normal closing of the vacuum isolation cabin door is realized, and the use cost can be effectively saved; the convex block 24 on the valve plate 2 is matched with the sliding groove 18 in the box body 1 to form a sliding guide pair, the guide is safe and reliable, the axial positioning precision is high, the axial sealing force of the spring 27 and the differential pressure thrust of the vacuum pipeline 01 are borne, and the problems of small axial bearing force and low positioning precision of a wheel type guide device adopted in the prior art are solved; the first driving mechanism adopts a plurality of air cylinders or hydraulic cylinders 25 which are uniformly arranged along the circumferential direction of the sealing door 23, and the end face sealing ring 234 is uniformly applied with sealing force along the whole circumference, so that the sealing is safe and reliable; the diameter and the configuration number of the distribution circles of the air cylinders or the hydraulic cylinders 25 can be set according to the diameter and the requirement of the vacuum pipeline 01, and the device is suitable for large and ultra-large vacuum pipeline systems; the middle part of the sealing door 23 is designed to be of a grid structure, so that firstly, the rigidity of the sealing door 23 is enhanced, the sealing door is not easy to deform, the sealing effect is good, secondly, the sealing door 23 is communicated back and forth through the first through hole 231, the sealing of the sealing door 23 to the box body communication station 16 can be realized only through the spring force of the spring 27, the force generated by the pressure difference between two sides when the sealing door 23 is not communicated back and forth is prevented from being directly acted on the sealing door 23, the force required for opening and closing the sealing door 23 is prevented from being increased, the spring force provided by the spring 27 and the driving force of the air cylinder or the hydraulic cylinder 25 are required to be increased, the manufacturing cost is increased, and the rigidity and the strength of parts such as the end surface sealing ring 234 and the sealing door 23 are also required to be increased, so that the manufacturing cost is increased; the vacuum isolation cabin door is simple in structure, convenient to use and good in effect.

Example 2

As shown in fig. 8 and 9, a difference between the two-way normally closed vacuum isolation door of the present invention and embodiment 1 is that in this embodiment, the two sealing structures are respectively disposed on two sides of the valve plate sealing station 21, and each sealing structure has two sealing doors 23, and the two sealing doors 23 are respectively used for sealing the box body communication station 16 of the front half box body 11 and the box body communication station 16 of the rear half box body 12.

According to the vacuum isolation cabin door, the two box body communication stations 16 of the box body 1 are respectively sealed through the two sets of sealing structures, so that the better sealing performance is achieved, when a single set of sealing structure fails to cause sealing failure, the other set of sealing structure can still effectively seal and isolate the two adjacent vacuum pipelines 01, and a reliable vacuum environment is provided for a vacuum pipeline system; in addition, the spring force of the spring 27 in the two sealing structures is opposite, and the spring forces acting on the valve plate 2 can be well offset, so that the axial thrust borne by a sliding guide pair formed by matching the bump 24 and the sliding groove 18 is greatly reduced or even eliminated, and the vacuum isolation cabin door is simple in structure, convenient to use and good in effect.

Example 3

As shown in fig. 1 to 9, the method for using a vacuum insulated door according to the present invention, using a vacuum insulated door as described in embodiment 1 or embodiment 2, wherein the vacuum pipe 01 on one side of the vacuum insulated door is in a vacuum state, the vacuum pipe 01 on the other side is in a non-vacuum state, and a pressure difference exists between the two sides, includes the following steps:

the action of the cylinder or hydraulic cylinder 25 overcomes the spring force of the spring 27, the sealing door 23 is pulled to be close to the circular ring tube 211 and far away from the sealing end face 19 through the piston rod of the cylinder or hydraulic cylinder 25 and the pull rod 26, the spring 27 is compressed, the end face sealing ring 234 is released from contact with the sealing end face 19, the sealing ring slides in the mounting hole until the sealing flange abuts against the end face of the circular ring tube 211, so that the sealing of the vacuum pipeline 01 on two sides of the vacuum isolation cabin door is released until the pressure in the vacuum pipeline 01 is consistent.

The driver 32 drives the lead screw 31 to rotate, the lead screw 31 rotates to drive the lead screw nut to move linearly from right to left, so as to drive the valve plate 2 to move along the sliding groove 18 in the box body 1 from right to left, as shown in fig. 1 and 2, the valve plate sealing station 21 enters the stop station of the box body 1, and the valve plate communication station 22 is aligned with the box body communication station 16, so that the vacuum pipelines 01 on two sides of the vacuum isolation cabin door are communicated, and the passing of a magnetic suspension train is met.

In the vacuum pipeline communication method according to this embodiment, the air cylinder or hydraulic cylinder 25 acts to overcome the spring force of the spring 27, so that the spring force compressed by the end-face sealing ring 234 and the sealing end face 19 is released, the vacuum pipeline 01 is released in sealing, and the internal pressure of the vacuum pipeline is consistent, because the first through hole 231 is arranged on the sealing door 23, no pressure difference exists between two sides of the sealing door 23, the pressure difference of the vacuum pipeline 01 acts on the valve plate 2 and is further transmitted to the joint between the valve plate 2 and the box body 1, i.e., the sliding guide pair, which is formed by matching the protrusion 24 and the sliding groove 18, has high axial positioning accuracy, and can well bear the axial thrust and the pressure difference thrust of the spring 27; then, the driver 32 drives the valve plate 2 to slide in the box body 1, so that the valve plate sealing station 21 is separated from the box body communication station 16, the valve plate communication station 22 is aligned with the box body communication station 16, and the vacuum pipeline 01 is communicated.

Example 4

As shown in fig. 10 to 17, the one-way normally-open vacuum isolation cabin door of the present invention includes a box body 1, a valve plate 2, a second driving mechanism 3, and a pipe 4, which is a normally-open door.

As shown in fig. 10 to 12, the box body 1 includes a front half box body 11, a rear half box body 12 and an end cover 13, the front half box body 11 and the rear half box body 12 are combined into a right box body through a seam allowance, a combining surface and a bolt handle, a sealing groove is processed on the combining surface, a box body sealing element 14 is installed in the sealing groove, a seam allowance and a handle combining surface which are positioned by the end cover 13 are processed on the left end surface of the right box body, the right box body and the end cover 13 are connected through the bolt handle, a sealing groove is processed on the handle combining surface, an end cover sealing element 15 is installed in the sealing groove, the front half box body 11 and the rear half box body 12 are respectively connected with vacuum pipelines 01, and two vacuum pipelines 01 are aligned.

As shown in fig. 10 to 12, the box body 1 is provided with three independent stations, a station located in the middle is a box body communicating station 16, a left station and a right station are stop stations for accommodating the valve plate 2, the box body communicating stations 16 are distributed on the front side and the rear side of the box body 1, namely, the front half box body 11 and the rear half box body 12 are respectively provided with one box body communicating station 16, the box body communicating stations 16 are circular tubes having the same inner diameter as the vacuum pipeline 01, and the two box body communicating stations 16 are arranged oppositely and coaxially.

As shown in fig. 15, two ends of the box body communication station 16 are provided with flanges, the flanges facing the outside of the box body 1 are connected with the corresponding vacuum pipes 01 in a sealing manner, an installation space for the valve plate 2 is provided between the flanges facing the inside of the box body 1, a flange surface facing the flanges inside the box body 1 is a sealing end surface 19, a limit sensor 191 is provided on an adjacent surface of the sealing end surface 19, and the adjacent surface may be an inner ring surface of the flange or an outer ring surface of the flange.

As shown in fig. 13, a box mounting table 17 is arranged at the bottom of the circular tube of the box communication station 16, and the box mounting table 17 is used for mounting a magnetic suspension motor bracket.

As shown in fig. 10, 11, 13 to 16, the inner top surface and the inner bottom surface of the case 1 are respectively provided with a sliding groove 18 from left to right, that is, the sliding groove 18 is provided along the longitudinal direction of the front half case 11 and the rear half case 12, and the sliding groove 18 is U-shaped.

As shown in fig. 10 and 11, the valve plate 2 is provided with two independent stations, the left side is a valve plate sealing station 21, the right side is a valve plate communicating station 22, the valve plate communicating station 22 is a circular tube having the same inner diameter as the box body communicating station 16, a valve plate mounting table 29 is arranged at the bottom of the circular tube of the valve plate communicating station 22, the valve plate mounting table 29 is used for mounting a motor bracket, a sealing door 23 is arranged at the valve plate sealing station 21, and the sealing door 23 on the valve plate 2 and the sealing end face 19 on the box body 1 are mutually matched to form a sealing structure.

As shown in fig. 15 and 16, the valve plate sealing station 21 is formed by assembling and welding an annular tube 211, a tube end flange 212, an inner web plate, a rib plate, an outer web plate, and a rib plate with an integral structure with the valve plate 2, wherein a mounting hole for mounting the sealing door 23 is formed in the annular tube 211, the sealing door 23 includes a sealing ring and a sealing flange, the sealing flange is connected to an end portion of the sealing ring, preferably, the sealing ring and the sealing flange are integrally formed members, the sealing ring and the sealing flange form a member with an L-shaped cross section, an outer annular surface of the sealing ring is slidably connected to the mounting hole of the annular tube 211, a mounting groove is formed on an outer annular surface of the sealing ring, a radial sealing ring 232 and a guide ring 233 are provided, the guide ring 233 is provided on both sides of the radial sealing ring 232, the radial sealing ring 232 is closely attached to the mounting hole, the guide ring 233 is an easily sliding wear-resistant member, a teflon plate is used in this embodiment, sealing and the two sides of the mounting hole are isolated by the radial sealing ring 232, and the guide ring 233 supports the sealing door 23 in the mounting hole and protects the radial sealing ring 232.

As shown in fig. 16, a lattice structure is arranged in the sealing ring, the lattice structure enhances the rigidity of the sealing ring, so that the sealing door 23 is not easy to deform and has a good sealing effect, and the material for manufacturing the sealing door 23 is also saved, the lattice structure is provided with at least one first through hole 231, and the first through holes 231 are communicated with the front side and the rear side of the sealing door 23, so that the sealing door 23 is communicated front and rear, and the phenomenon that the force generated by the pressure difference between the two sides directly acts on the sealing door 23 when the front side and the rear side are not communicated with each other, which causes the force required for opening and closing the sealing door 23 to be greatly increased and the manufacturing cost to be increased is avoided.

As shown in fig. 15 and 16, sealing flange is located the mounting hole with between the seal end face 19, sealing flange orientation 19 one side of seal end face is provided with the ladder constant head tank, be provided with end face seal 234 and sealed clamping ring 235 in the ladder constant head tank, end face seal 234's interior snare is located on the ladder face of ladder constant head tank, sealed clamping ring 235 press in end face seal 234's outer loop, sealed clamping ring 235 is used for ensuring end face seal 234 can normally work, be unlikely to by seal end face 19 crushes, limit sensor 191 is used for detecting the degree of being close to of sealing door 23 also avoids seal end face 19 with sealing flange will end face seal 234 crushes.

As shown in fig. 15 to 17, a first driving mechanism is disposed on the valve plate 2, the first driving mechanism includes a plurality of air cylinders or hydraulic cylinders 25, the air cylinders or hydraulic cylinders 25 are uniformly arranged along the circumference of the sealing door 23, as shown in fig. 10 and 11, in this embodiment, 12 air cylinders or hydraulic cylinders 25 are uniformly distributed, the valve plate 2 is provided with a mounting spigot, the air cylinders or hydraulic cylinders 25 are fixedly connected with the valve plate 2 through bolts and the mounting spigot, a cylindrical spigot is processed at the end of a piston rod of the air cylinders or hydraulic cylinders 25, the pull rod 26 is a combined unit composed of a spline 263 and a rod 264, a spline groove matched with a spline tooth 281 is processed in the spline disc 263, a screw thread matched with a locking nut 261 is processed at the left end of the rod 264, spline teeth 281 matched with the spline groove of the spline disc 263 are processed at the right end of the spring guide 28, a step is processed at the front section of the spline tooth 281, the pull rod 26 penetrates through an inner hole and a left end of the spring guide sleeve 28, the spline tooth penetrates through the spline groove of the spline disc 263, the spline groove is inserted into the through the inner hole of the spline groove of the cylindrical guide sleeve 261, the cylindrical guide sleeve 26, the end of the cylinder flange 281 is tightly attached to the end face of the cylinder flange, and the cylinder flange 212, the end face of the cylinder flange 212, and the cylinder flange 212, the end face of the cylinder flange 212 are tightly attached to the cylinder flange 212, the spring 27 is sleeved on the outer cylindrical surface of the spring guide 28, one end of the spring 27 is tightly attached to the left side of the splined disc 263, the other end of the spring 27 is tightly attached to the right side of the pipe end flange 212, pre-compression installation is adopted when the spring 27 is installed, the pull rod 26 pulls the sealing door 23 to move right through the splined disc 263 and the locking nut 261 at the right end of the pull rod 26 under the action of pre-compression force of the spring 27, so that the sealing door 23 is abutted to the left end surface of the pipe end flange 212, and the spring guide 28 is pushed to move right and abutted to the piston rod spigot end surface of the air cylinder or hydraulic cylinder 25, so that the sealing door 23 is in an open state for a long time. When the air cylinder or the hydraulic cylinder 25 works, the spring guide sleeve 28 is pushed to move leftwards, the spring guide sleeve 28 pushes the sealing door 23 to approach the sealing end face 19 until the sealing door is abutted against the sealing end face 19, the end face sealing ring 234 on the sealing door 23 is tightly attached to the sealing end face 19, the front and the rear communication stations 16 of the box body 1 are sealed and separated, and the sealing door 23 is in a closed state.

As shown in fig. 10, 11, 13 to 16, the top and the bottom of the valve plate 2 are respectively provided with a protruding block 24, the protruding block 24 is installed in cooperation with a mounting groove on the valve plate 2 through a fastening member, a protruding portion of the protruding block 24 has three working surfaces, each of the working surfaces is provided with a set of sliding plates 241, each set of sliding plates 241 includes a plurality of sliding plates 241, the sliding plates 241 are uniformly arranged and installed on the protruding block 24 through a fastening member, the protruding block 24 is arranged in the sliding groove 18 and is matched to form a sliding guide pair, the sliding plates 241 are attached to the sliding groove 18, and the valve plate 2 and the housing 1 are slidably connected through the matching of the protruding block 24 and the sliding groove 18, the sliding plates 241 are wear-resistant and lubricated lining plates, and in this embodiment, self-lubricated wear-resistant lining plates are adopted; when the valve plate 2 is maintained, the end cover 13 is only required to be opened, and the valve plate 2 is drawn out from one side of the end cover 13 along the sliding groove 18, so that the valve plate 2 is very convenient to maintain.

As shown in fig. 10 to 12 and 14, the second driving mechanism 3 includes a lead screw 31, a driver 32, a lead screw bearing seat 33, a nut bearing seat 34, and a rotary encoder 35, the driver 32 is located outside the end cover 13 and hermetically fixed on the box body 1, the driver 32 is connected to one end of the lead screw 31 through a coupling, the other end of the lead screw 31 is connected to the rotary encoder 35 through a coupling, the lead screw 31 is installed in the box body 1 through two lead screw bearing seats 33, the lead screw 31 extends from a staying station of the box body 1 to the box body communicating station 16, the lead screw bearing seat 33 supports the lead screw 31, the lead screw 31 is in threaded connection with a lead screw nut, the lead screw nut is connected to the nut bearing seat 34, the nut bearing seat 34 is connected to the valve plate 2, the driver 32 is a motor, the lead screw 31 is rotated by the rotation of the motor, the lead screw 31 drives the lead screw nut to linearly reciprocate along the lead screw 31, thereby driving the valve plate 2 to slide in the box body 1, the rotary encoder 35 measures the angular velocity or the pitch of the lead screw 31 to control the displacement of the lead to the valve plate 2, and control the accurate communication between the valve plate 21 and the valve plate 2, so as to realize accurate communication between the accurate positioning and the accurate positioning of the valve plate communication station 21.

In some specific embodiments, the second driving mechanism 3 is a belt pulley system, the belt pulley system includes a driving wheel, a driven wheel and a belt, the belt is connected to the driving wheel and the driven wheel, the driving wheel and the driven wheel are connected to the box 1, the belt is connected to the valve plate 2, a shaft of the driving wheel is connected to a motor and a rotary encoder through a coupling, and the rotary encoder is used for detecting and controlling the position of the valve plate 2; a linear displacement sensor can be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; the valve plate communication station 22 and the valve plate sealing station 21 can be accurately aligned with the box body communication station 16 respectively.

As shown in fig. 10 and 14, the pipe 4 includes an annular pipe 41 and a hose 42, the annular pipe 41 is connected to all the cylinders or hydraulic cylinders 25 at the same time through pipe joints, the tank 1 is provided with a tank-passing joint, the inside of the tank-passing joint is connected to the hose 42, the outside of the tank-passing joint is connected to an incoming pipe of a gas station or a hydraulic station, and the hose 42 is connected to the annular pipe 41.

As shown in fig. 10, 13 and 14, in the vacuum isolation door, normally, the valve plate communication station 22 is aligned with the box body communication station 16, the valve plate sealing station 21 is located at a stop station of the box body 1, so that the front and rear vacuum pipes 01 are communicated with the valve plate communication station 22 through the box body communication station 16, the sealing door 23 of the valve plate sealing station 21 is pulled toward the pipe end flange 212 and abutted against the left end face of the pipe end flange 212 by the pull rod 26 under the thrust generated by the pre-compression force of the spring 27, the end face seal ring 234 is away from the sealing end face 19, and the vacuum isolation door is in a normally open state. When the front and rear vacuum pipes 01 need to be sealed and isolated, the second driving mechanism 3 drives the valve plate 2 to slide in the box 1, so that the valve plate sealing station 21 moves to the box communication station 16 and is aligned, as shown in fig. 11, the valve plate communication station 22 moves to the stop station of the box 1, so that the front and rear vacuum pipes 01 are isolated by the valve plate 2, then the cylinder or hydraulic cylinder 25 operates, the sealing door 23 is pushed to approach the sealing end face 19 through the piston rod of the cylinder or hydraulic cylinder 25 and the spring guide sleeve 28 until the sealing end face abuts against the sealing end face 19, the end face sealing ring 234 abuts against the sealing end face 19, so that the sealing door 23 is in a closed state, and the sealing door 23 pushes the spring 27 to be compressed leftward through the spline disc 263; whether the sealing door 23 is closed in place can be detected and controlled through the limit sensor 191, and the sealing door 23 is prevented from colliding with the sealing end face 19, so that the end face sealing ring 234 is damaged. When sealing is not needed, the air cylinder or the hydraulic cylinder 25 stops working and releases pressure, the sealing door 23 pushes the pull rod 26 to move rightwards under the action of thrust released by compression force of the spring 27, the locking nut 261 pulls the sealing door 23 to move rightwards until the sealing door 23 abuts against the left end face of the pipe end flange 212, the sealing door 23 pushes the spring guide sleeve 28 to move rightwards, the spring guide sleeve 28 pushes a piston rod of the air cylinder or the hydraulic cylinder 25 to move rightwards until the piston rod returns to the initial position, the sealing door 23 is in a normally open state, meanwhile, the second driving mechanism 3 drives the valve plate 2 to slide in the box body 1, the valve plate communication station 22 moves towards the box body communication station 16 and is aligned, and the vacuum isolation cabin door is in a normally open state.

According to the vacuum isolation cabin door, the three independent stations are arranged in the box body 1, the two independent stations are arranged on the valve plate 2, the valve plate 2 is integrally arranged in the box body 1, the handle surfaces of the end cover 13, the front half box body 11 and the rear half box body 12 which form a part of the box body 1 are positioned by adopting the seam allowance, and the box body sealing piece 14 and the end cover sealing piece 15 are sealed, so that the sealing performance of the vacuum isolation cabin door is ensured, and a reliable vacuum environment is provided for a vacuum pipeline system; when the valve plate 2 is maintained, the valve plate 2 is drawn out from one side of the end cover 13 along the sliding groove 18 only by opening the end cover 13, which is very convenient; two independent stations are arranged on the valve plate 2, the valve plate 2 is driven to move back and forth by the second driving mechanism 3, the reliable switching of the valve plate sealing station 21 and the valve plate communicating station 22 at the tank body communicating station is realized, and the communication and the sealing closing with the tank body communicating station 16 are completed; the sealing door 23 is attached to the valve plate 2 only through the pre-compression force of the spring provided by the spring 27 without the work of the first driving mechanism, so that the normal opening of the vacuum isolation cabin door is realized, and the use cost can be effectively saved; the bump 24 on the valve plate 2 is matched with the chute 18 in the box body 1 to form a sliding guide pair, the guide is safe and reliable, the axial positioning precision is high, the axial sealing force of the second driving mechanism and the differential pressure thrust of the vacuum pipeline 01 are borne, and the problems of small axial bearing force and low positioning precision of a wheel type guide device adopted in the prior art are solved; the first driving mechanism adopts a plurality of air cylinders or hydraulic cylinders 25 which are uniformly arranged along the circumferential direction of the sealing door 23, and the end face sealing ring 234 is uniformly applied with sealing force along the whole circumference, so that the sealing is safe and reliable; the diameter and the configuration number of the distribution circles of the cylinders or the hydraulic cylinders 25 can be set according to the diameter and the requirement of the vacuum pipeline 01, and the device is suitable for large and ultra-large vacuum pipeline systems; the middle part of the sealing door 23 is designed to be of a grid structure, so that firstly, the rigidity of the sealing door 23 is enhanced, deformation is not easy to generate, the sealing effect is good, secondly, the sealing door 23 is communicated back and forth through the first through hole 231, the sealing of the sealing door 23 on the box body communicating station 16 can be realized only through the smaller driving force of the air cylinder or the hydraulic cylinder 25, the direct action of the force generated by pressure difference between two sides on the sealing door 23 when the sealing door 23 is not communicated back and forth is avoided, the force required for opening and closing the sealing door 23 is prevented from being increased, the spring precompression force provided by the spring 27 is required to be increased to open the sealing door 23 and close the sealing door 23 through the driving force of the air cylinder or the hydraulic cylinder 25, the manufacturing cost is increased, and the stress increase of parts such as the end face sealing ring 234 and the sealing door 23 and the like can also be avoided, the rigidity and the strength of the parts are required to be increased or enhanced, and the manufacturing cost is increased; the vacuum isolation cabin door is simple in structure, convenient to use and good in effect.

Example 5

As shown in fig. 18 to 20, the bidirectional normally-open vacuum isolation door of the present invention is different from embodiment 4 in that, in this embodiment, two sets of sealing structures are provided on the sealing station 21 of the valve plate 2, two sealing doors 23 are respectively located at two sides of the sealing station 21 of the valve plate, and the two sealing doors 23 are respectively used for sealing the box body communication station 16 of the front half box body 11 and the box body communication station 16 of the rear half box body 12.

When the vacuum isolation cabin door needs to be closed, two box body communication stations 16 of the box body 1 are respectively sealed through two sets of sealing structures, so that the vacuum isolation cabin door has better sealing performance, and when a single set of sealing structure has a problem and causes sealing failure, the other set of sealing structure can still effectively seal and separate two adjacent vacuum pipelines 01, so that a reliable vacuum environment is provided for a vacuum pipeline system; in addition, the driving forces of the second driving mechanisms in the two sealing structures are opposite, and the driving counter forces acting on the valve plate 2 can be well counteracted, so that the axial thrust borne by a sliding guide pair formed by matching the bump 24 with the sliding groove 18 is greatly reduced or even eliminated.

Example 6

As shown in fig. 10 to 20, the method for using a vacuum insulated door according to the present invention, using a vacuum insulated door as described in embodiment 4 or embodiment 5, wherein the two vacuum pipes 01 on both sides of the vacuum insulated door are both in a vacuum state or a non-vacuum state, and there is no pressure difference between both sides, includes the following steps:

the driver 32 drives the lead screw 31 to rotate, the lead screw 31 rotates to drive the lead screw nut to linearly move from left to right, so as to drive the valve plate 2 to linearly move from left to right in the box body 1 along the chute 18, as shown in fig. 10 and 11, the valve plate communication station 22 enters a stop station of the box body 1, and the valve plate sealing station 21 is aligned with the box body communication station 16, so that the vacuum pipelines 01 on two sides of the vacuum isolation cabin door are isolated by the valve plate 2;

the cylinder or hydraulic cylinder 25 acts to overcome the pre-compression force of the spring 27, the sealing door 23 is pushed outwards to be close to the box sealing end face 19 and far away from the pipe end flange 212 through the piston rod of the cylinder or hydraulic cylinder 25, the spring guide sleeve 28 and the pull rod 26, the spring 27 is compressed, the end face sealing ring 234 is tightly attached to the sealing end face 19, the sealing ring slides in the mounting hole of the pipe end flange 212 until the sealing flange triggers the limit sensor 191, so that the vacuum pipelines 01 on two sides of the vacuum isolation cabin door are sealed and isolated, and the two vacuum pipelines 01 can be independently regulated in pressure.

In the method for closing the vacuum pipeline, the driver 32 drives the valve plate 2 to slide in the box body 1, so that the valve plate sealing station 21 is aligned with the box body communication station 16, the valve plate communication station 22 is away from the box body communication station 16, and the vacuum pipeline 01 is blocked; the pre-compression force of the spring 27 is overcome through the action of the air cylinder or the hydraulic cylinder 25, the end face sealing ring 234 is pressed on the sealing end face 19 through the driving force of the air cylinder or the hydraulic cylinder 25, the vacuum pipeline 01 is sealed and isolated, because the sealing door 23 is provided with the first through hole 231, no pressure difference exists on two sides of the sealing door 23, the pressure difference of the vacuum pipeline 01 acts on the valve plate 2 and is further transmitted to the joint of the valve plate 2 and the box body 1, namely the sliding guide pair, the sliding guide pair is formed by matching the lug 24 and the sliding groove 18, the axial positioning precision is high, the axial thrust and the differential pressure thrust of the air cylinder or the hydraulic cylinder 25 can be well borne, and the method has the advantages of simple steps, convenience in operation, few action steps, capability of quick response and good effect.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A sealing door (23) is characterized in that an end face sealing ring (234), a radial sealing ring (232) and at least one first through hole (231) are arranged on the sealing door (23), the end face sealing ring (234) is arranged on one side of the sealing door (23), the radial sealing ring (232) is arranged on the outer ring surface of the sealing door (23), the first through hole (231) is communicated with two sides of the sealing door (23), the outer ring surface of the sealing door (23) is in sliding fit in a mounting hole of a valve plate (2), the radial sealing ring (232) is tightly attached to the mounting hole, and the end face sealing ring (234) is used for being attached to a sealing end face (19).

2. Sealing door (23) according to claim 1, characterized in that at least one of the two sides of the radial sealing ring (232) is provided with a guide ring (233).

3. Sealing door (23) according to claim 2, characterized in that the guide ring (233) is a wear part that is easy to slide.

4. Sealing door (23) according to claim 3, characterized in that the guiding ring (233) is a teflon plate.

5. The sealing door (23) as claimed in claim 2, wherein the sealing door (23) comprises a sealing ring and a sealing flange, the sealing flange is connected to an end of the sealing ring, the sealing ring and the sealing flange form a member with an L-shaped cross section, an outer annular surface of the sealing ring is slidably connected in the mounting hole, and the radial sealing ring (232) and the guide ring (233) are arranged on the outer annular surface of the sealing ring.

6. The sealing door (23) as claimed in claim 5, wherein an installation groove is provided on an outer circumferential surface of the sealing ring, and the radial sealing ring (232) and the guide ring (233) are installed in the installation groove.

7. Sealing door (23) according to claim 5, characterized in that the sealing ring and the sealing flange are an integrally formed component.

8. Sealing door (23) according to claim 5, characterized in that a lattice structure is connected within the sealing ring, on which lattice structure the first through hole (231) is provided.

9. Sealing door (23) according to claim 5, characterized in that the sealing flange is provided with a stepped positioning groove, in which the end sealing ring (234) is arranged.

10. The sealing door (23) as claimed in claim 9, wherein the inner ring of the end sealing ring (234) is fitted over the stepped surface of the stepped positioning groove, and the outer ring of the end sealing ring (234) is fitted with a sealing ring (235).

11. Sealing door (23) according to any of the claims 1 to 10, characterized in that the plate surface of one side of the valve plate (2) is provided with a first driving mechanism, the first driving mechanism is connected with the sealing door (23), and the first driving mechanism is used for driving the sealing door (23) to approach or move away from the valve plate (2).

12. Sealing door (23) according to claim 11, characterized in that a spring (27) is provided between the sealing door (23) and the valve plate (2), the spring (27) being mounted pre-compressed, the spring (27) and the face seal (234) being provided on both sides of the sealing door (23), respectively.

13. A door (23) according to claim 12, characterized in that the two ends of the spring (27) act on the door (23) and the first actuating mechanism, respectively, and the end-face seal (234) is pressed against the sealing end face (19) by the spring force of the spring (27) to form a normally closed configuration, and the first actuating mechanism can drive the door (23) to compress the spring (27) and move away from the sealing end face (19).

14. The sealing door (23) of claim 13, wherein a pull rod (26) is disposed on the valve plate (2), the pull rod (26) is connected to the sealing door (23), a spring guide (28) is sleeved outside the pull rod (26), the spring (27) is sleeved outside the spring guide (28), the first driving mechanism includes a plurality of cylinders or hydraulic cylinders (25), the cylinders or hydraulic cylinders (25) are uniformly distributed along the circumferential direction of the sealing door (23), the cylinder bodies of the cylinders or hydraulic cylinders (25) are connected to the valve plate (2), and the piston rods of the cylinders or hydraulic cylinders (25) are connected to the pull rod (26).

15. Sealing door (23) according to claim 14, characterized in that one end of the pull rod (26) is connected with the end of the piston rod of the cylinder or hydraulic cylinder (25), the end of the piston rod of the cylinder or hydraulic cylinder (25) is provided with a groove body, the end of the pull rod (26) extends into the groove body and is hinged with the end of the piston rod of the cylinder or hydraulic cylinder (25), and the two ends of the spring (27) respectively act on the ends of the cylinder bodies of the sealing door (23) and the cylinder or hydraulic cylinder (25).

16. The sealing door (23) according to claim 12, wherein both ends of the spring (27) respectively act on the end surfaces of the pipe end flange (212) and the pull rod spline disc (263), the sealing door (23) is tightly attached to the valve plate (2) by the spring force of the spring (27), a gap is formed between the planes of the end surface sealing ring (234) and the sealing end surface (19), a normally open structure is formed, the first driving mechanism can drive the spring guide sleeve (28) to push the sealing door (23) to the sealing end surface (19), the end surface sealing ring (234) is attached to the sealing end surface (19), and the spring (27) is compressed.

17. The sealing door (23) as claimed in claim 16, wherein a pull rod (26) is disposed on the valve plate (2), the pull rod (26) is connected to the sealing door (23), a spring guide sleeve (28) is sleeved outside the pull rod (26), the spring (27) is sleeved outside the spring guide sleeve (28), the first driving mechanism includes a plurality of air cylinders or hydraulic cylinders (25), the air cylinders or hydraulic cylinders (25) are uniformly distributed along a circumferential direction of the sealing door (23), a cylinder body of the air cylinders or hydraulic cylinders (25) is connected to the valve plate (2), a pipe end flange (212) is disposed on the valve plate (2), the pipe end flange (212) is disposed on one side of the sealing door (23), the pull rod (26) includes a spline disc (263) and a rod body (264), the spline disc (263) and the rod body (264) form an integrated structure, the spring guide sleeve (28) is sleeved outside the rod body (264), and the spring guide sleeve (27) is sleeved outside the spring guide sleeve (28).

18. The sealing door (23) as claimed in claim 17, wherein the splined disc (263) is provided with splined grooves matching with the spring guiding sleeve (28), one end of the spring guiding sleeve (28) is provided with splined teeth (281) matching with the splined grooves of the splined disc (263), the splined teeth (281) penetrate through the splined grooves of the splined disc (263) and abut against and are connected with the piston rod end of the cylinder or hydraulic cylinder (25), the other end of the spring guiding sleeve (28) penetrates through and is connected with the tube end flange (212) in a sliding manner and abuts against the sealing door (23), one end of the spring (27) abuts against the tube end flange (212) and the other end abuts against the splined disc (263), the sealing door (23) pushes the pull rod (26) under the spring force of the spring (27) to pull the sealing door (23) towards the tube end flange (212) and away from the sealing end face (19) to form a normally open structure, and a piston rod of the cylinder or hydraulic cylinder (25) can push the spring (28) to move axially and push the sealing guiding sleeve (23) towards the sealing door (19).

19. Sealing door (23) according to claim 12, characterized in that several springs (27) are provided, distributed along the circumference of the sealing door (23).

20. A vacuum isolation cabin door, characterized by comprising a box body (1) and a sealing door (23) according to any one of claims 1 to 19, wherein end flanges are arranged on two sides of the box body (1) and are respectively in sealing connection with vacuum pipelines (01), the two vacuum pipelines (01) are coaxially arranged, convex blocks (24) are respectively arranged at the top and the bottom of a valve plate (2), a sliding groove (18) is arranged in the box body (1), the convex blocks (24) are arranged in the sliding groove (18) and are matched into a sliding guide pair, the plate surface of the valve plate (2) can move to or be far away from two vacuum pipelines (01), and the sealing end surfaces (19) are arranged in the box body (1).

21. Vacuum insulated hatch according to claim 20, characterized in that it also comprises a second driving mechanism (3), the second driving mechanism (3) driving the sliding of the valve plate (2) inside the box (1).

22. Vacuum insulated door according to claim 20, characterized in that the abutting surface of the sealing end surface (19) is provided with a limit sensor (191), the limit sensor (191) being a proximity switch, a limit switch or other position detection sensor.

23. Vacuum insulated door according to claim 20, characterized in that the projection of the cam (24) has three working surfaces, on each of which a set of sliding plates (241) is arranged, each set of sliding plates (241) comprising several, the sliding plates (241) fitting into the chute (18).

24. The vacuum insulated door according to claim 20, characterized in that the box body (1) is sequentially provided with three independent stations, the station in the middle is a box body communication station (16) communicated with the vacuum pipe (01), the two sides of the box body communication station (16) are respectively stop stations for accommodating the valve plate (2), the box body communication stations (16) are distributed on the front side and the rear side of the box body (1) and are coaxially arranged, the box body communication station (16) is a circular tube with the same inner diameter as the vacuum pipe (01), and the sealing end face (19) is arranged on one side of the box body communication station (16) facing the valve plate (2).

25. Vacuum insulated door according to claim 24, characterized in that the valve plate (2) is provided in sequence with two independent stations, one being a valve plate sealing station (21) and the other being a valve plate communication station (22), the valve plate communication station (22) being a round tube with the same inner diameter as the tank communication station (16), the valve plate sealing station (21) being provided with the sealing door (23).

26. The vacuum insulated door according to any of claims 20 to 25, characterized in that the box body (1) comprises a front half box body (11), a rear half box body (12) and an end cover (13), the front half box body (11) and the rear half box body (12) are hermetically connected, a box body sealing member (14) is arranged on the joint surface, the same end of the front half box body (11) and the rear half box body (12) is hermetically connected with the end cover (13), an end cover sealing member (15) is arranged on the joint surface, and the box body sealing member (14) and the end cover sealing member (15) are strip-shaped sealing members or plate-shaped sealing members.

27. A bi-directional sealed vacuum insulated hatch door, characterized in that it comprises a vacuum insulated hatch door according to any of claims 20 to 26, one sealing door (23) being provided on each side of said valve plate sealing station (21), both sealing doors (23) being provided for sealing the corresponding vacuum ducts (01).