A normally open sealing structure, a vacuum isolation hatch, and a method for closing a vacuum pipeline

Abstract

The present invention relates to a normally open sealing structure, a vacuum isolation hatch, and a method for closing a vacuum pipeline. The normally open sealing structure includes a box body and a sealing door. A sealing end face and a first driving mechanism are provided inside the box body. The sealing door and the first driving mechanism are arranged on a valve plate. An end face sealing ring and a spring are provided on the sealing door. The two ends of the spring act on the end face of the pipe end flange and the pull rod flower keyboard respectively. The sealing door is pressed against the pipe end flange by the spring force, so that the end face sealing ring is away from the sealing end face. The first driving mechanism can drive the sealing door to approach the sealing end face and compress the spring, so that the end face sealing ring fits on the sealing end face. In the present invention, without the first driving mechanism working, the sealing door is pressed against the pipe end flange only by the spring force provided by the spring, realizing that the vacuum isolation hatch is normally open, effectively saving the use cost. By pushing the sealing door with the first driving mechanism, the end face sealing ring can be tightly attached to the sealing end face, so that the normally open vacuum isolation hatch is sealed and closed.

Description

Technical Field

[0001] The present invention relates to the field of vacuum magnetic levitation, and in particular to a normally open sealing structure, a vacuum isolation hatch, and a method for closing a vacuum pipeline. Background Art

[0002] Fluid conveying pipeline systems usually use gate valves, globe valves, butterfly valves, ball valves, plug valves, etc. to achieve the opening and closing of fluid conveying pipeline systems. These valves are widely used in conveying pipeline systems for liquid water, liquid oils, gaseous materials, fluidized materials, etc.

[0003] Currently, most of these valves are single-station on-off valves, suitable for pipelines with a small nominal diameter. The pipeline system cannot be used for the conveyance of maglev vehicles or solid materials, etc., nor for the on-off switching during the conveyance process.

[0004] Currently, the on-off valve for the passage of tangible objects is a gate cut-off valve. The gate valve has an opening and closing gate plate, and its movement direction is perpendicular to the movement direction of the object. There are two types of gate valves: wedge gate valves and parallel gate valves.

[0005] The two sealing surfaces of the wedge gate plate form a wedge shape. The sealing is achieved by relying on the thrust of the valve stem to ensure the pressing pressure between the wedge-shaped sealing surface of the gate plate and the valve body sealing surface. The processing requirements for the wedge-shaped sealing surfaces of the wedge gate plate and the valve body are high, and they are prone to wear. It is necessary to maintain a constant valve stem thrust for a long time. It is only suitable for gate cut-off valves with a small to medium nominal diameter and cannot meet the on-off and sealing requirements of vacuum pipelines for vacuum magnetic levitation.

[0006] The sealing surface of the parallel gate valve is parallel to the movement direction of the gate plate. The parallel gate valve mainly consists of a gate plate, a sealing device, a sealing actuator, a gate plate movement mechanism, a valve body, etc. The movement of the gate plate is achieved by the rotation of a trapezoidal thread lead screw nut pair. Its drive has two types: manual and electric. For large gate valves, electric drive is used to move the gate plate to the open position and the closed position. The sealing of the parallel gate valve is achieved by a multi-group parallel four-bar mechanism composed of a push rod mechanism, an inclined rod mechanism of the sealing actuator, and a sealing plate of the sealing device to push the sealing plate outwards in parallel. The inclined rod mechanism changes from an inclined state to a vertical state until the sealing ring on the sealing plate abuts against the valve body sealing end face and meets and maintains the sealing force requirement, thereby achieving sealing and closing the gate valve; the drive of the sealing actuator is also achieved by a trapezoidal thread lead screw nut pair.

[0007] In order to ensure the reliable and stable operation of the sealing device, the sealing actuator, the gate plate, and the movement mechanism, it is also necessary to set: (1) multiple groups of panel support wheels and side plate guide wheels to ensure that the valve plate moves smoothly in the valve body with the valve body or the guide rail as the guide; (2) multiple groups of rollers are arranged on the valve plate. When the valve plate moves to the valve port, the valve plate rollers reach the position and the valve plate stops moving forward; (3) multiple groups of sealing plate wheels for guiding the sealing plate; (4) valve plate load-bearing wheels and guide wheel groups for bearing the weight of the entire valve plate and various mechanisms installed thereon.

[0008] Therefore, the parallel gate valve has many mechanisms, a complex structure, high manufacturing difficulty, high cost, and high failure rate. Its sealing device and sealing actuator are both arranged inside the gate plate, making it inconvenient for inspection, maintenance, and replacement after a failure. The opening and closing of the sealing device are achieved by multiple groups of parallel four-bar mechanisms and multiple groups of panel support wheels. Due to inevitable errors in manufacturing and installation and multiple conversion links, the flatness of the sealing surface of the sealing plate is relatively low, the sealing effect is not ideal, and it is difficult to meet the sealing and switching requirements of such a large-scale maglev vacuum pipeline.

[0009] In view of the existing technologies of various on-off shut-off valves at present, for such special working conditions as a vacuum existing sealing working environment, a large-scale tangible solid being the maglev train passing through, a large diameter of the vacuum pipeline (generally 3m - 8m), and high sealing requirements, there are sealing problems and many deficiencies in using the existing gate valve sealing structure technology. Also, for the electric actuator driving the seal to match the sealing surface, when sealing is not required, the electric actuator pulls the seal away from the sealing surface. When the electric actuator is in the working state, it avoids the sealing surface shaking and colliding, damaging the seal and / or the sealing surface, resulting in seal failure when sealing is subsequently required. For using electric sealing in a normally open pipeline, electric energy needs to be consumed daily to make the electric actuator work, resulting in a very high usage cost of the pipeline. Summary of the Invention

[0010] The object of the present invention is to: aiming at the structural characteristics, existing deficiencies of the existing gate valve technology, and the difficulties in large-scale application and meeting the sealing and switching requirements of the maglev vacuum pipeline, especially the problem that electric energy needs to be consumed daily to make the electric actuator work to achieve the normally open state, resulting in a very high usage cost of the pipeline, provide a normally open sealing structure, a vacuum isolation hatch, and a vacuum pipeline closing method.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is:

[0012] A normally open sealing structure, comprising a box body and a sealing door. A sealing end face and a first driving mechanism are arranged inside the box body. The sealing door and the first driving mechanism are arranged on the valve plate inside the box body. An end face sealing ring and a spring are arranged on the sealing door. The two ends of the spring act on the end face of the pipe end flange and the pull rod flower keyboard respectively. The spring is pre-compressed and installed. The sealing door is pressed against the pipe end flange by the spring force of the spring, so that the end face sealing ring is away from the sealing end face. The first driving mechanism can drive the sealing door to be pressed against the sealing end face and compress the spring, so that the end face sealing ring is closely attached to the sealing end face.

[0013] Adopting a normally-open sealing structure according to the present invention, without the need for the first driving mechanism to work, the sealing door is abutted against the pipe end flange only by the spring force provided by the spring, so that the end face sealing ring is away from the sealing end face, realizing the normally-open of the vacuum isolation door, which can effectively save the use cost. And by pushing the sealing door against the sealing end face by the first driving mechanism and compressing the spring, the end face sealing ring can be closely attached to the sealing end face, making the normally-open vacuum isolation door sealed and isolated, and preparing for the pressure regulation of the vacuum pipeline. The principle of this normally-open sealing structure is simple, easy to use, and has good effects.

[0014] Preferably, a plurality of the springs are evenly distributed along the circumferential direction of the sealing door.

[0015] Adopting this structure, the spring forces of the plurality of evenly distributed springs act on the circumference of the sealing door, not only making the sealing door receive balanced force and not deformed, but also enabling the sealing door to be evenly abutted against the pipe end flange.

[0016] Further preferably, the valve plate is arranged in the box body, on which there is the pull rod, the pull rod is connected to the sealing door, a spring guide sleeve is sleeved outside the pull rod, and the spring is sleeved outside the spring guide sleeve.

[0017] Adopting this structure, the pull rod serves as the guiding part of the spring guide sleeve, and the spring guide sleeve serves as the guiding cylinder of the spring, avoiding large radial deformation of the spring, affecting the stability of the spring force and the service life of the spring.

[0018] Further preferably, after passing through the sealing door, the outer side of the pull rod is connected with a locking nut and locked.

[0019] Further preferably, the first driving mechanism includes a plurality of cylinders or hydraulic cylinders, the cylinders or hydraulic cylinders are evenly distributed along the circumferential direction of the sealing door, the cylinder body of the cylinder or hydraulic cylinder is connected to the valve plate, and the piston rod of the cylinder or hydraulic cylinder is connected to the spring guide sleeve.

[0020] Adopting this structure, a plurality of evenly distributed cylinders or hydraulic cylinders are connected in the circumferential direction of the sealing door, which can provide uniform spring force for the circumferentially pre-compressed spring, avoiding uneven force on the end face of the sealing door and causing deformation, affecting the sealing performance and the smooth movement of the sealing door.

[0021] Further preferably, a pipe end flange is arranged on the valve plate, the pipe end flange is located on one side of the sealing door, the pull rod includes a flower keyboard and a rod body, the flower keyboard and the rod body form an integral structure, the spring guide sleeve is sleeved outside the rod body, and the spring is sleeved outside the spring guide sleeve.

[0022] Further preferably, spline grooves matching with the spring guide sleeves are arranged on the flower-shaped keyboard. One end of each spring guide sleeve is provided with spline teeth matching with the spline grooves of the flower-shaped keyboard. The spline teeth pass through the spline grooves of the flower-shaped keyboard and abut against the piston rod end of the cylinder or hydraulic cylinder and are connected with the piston rod end in a matching manner. The other end of the spring guide sleeve passes through and is slidably connected to the pipe end flange and abuts against the sealing door. One end of the spring abuts against the pipe end flange, and the other end abuts against the flower-shaped keyboard. Under the action of the spring force of the spring, the sealing door pushes the pull rod to pull the sealing door towards abutting against the pipe end flange, so that the sealing door is away from the sealing end face, realizing that the hatch is normally open. The piston rod of the cylinder or hydraulic cylinder can push the spring guide sleeve to axially move and push the sealing door to abut against the sealing end face, so that the end face sealing ring is closely attached to the sealing end face, realizing the sealed closing of the hatch.

[0023] Preferably, a stepped positioning groove is arranged on the side of the sealing door facing the sealing end face, and the end face sealing ring is arranged in the stepped positioning groove.

[0024] With this structure, the end face sealing ring is positioned and limited by the stepped positioning groove.

[0025] Further preferably, the inner ring of the end face sealing ring is sleeved on the stepped surface of the stepped positioning groove, and a sealing pressing ring is matched with the outer ring of the end face sealing ring.

[0026] With this structure, the sealing pressing ring is used to ensure that the end face sealing ring can work properly and is not damaged by the sealing end face.

[0027] Further preferably, the end face sealing ring can be a trapezoidal sealing ring, an O-shaped sealing ring or other sealing rings.

[0028] Preferably, a limit sensor is arranged on the adjacent surface of the sealing end face, and the limit sensor is a proximity switch, a limit switch or other position detection sensors.

[0029] With this structure, the limit sensor is used to detect the approaching degree of the sealing door and also avoid the sealing end face and the sealing flange from damaging the end face sealing ring.

[0030] Further preferably, the normally open sealing structure further includes a pipe assembly, and the pipe assembly includes a circular pipe and a hose. The circular pipe is connected to all the cylinders or hydraulic cylinders at the same time. A through-box joint is arranged on the box body. The inside of the through-box joint is connected to the hose, and the outside is connected to a gas station or a hydraulic station. The hose is connected to the circular pipe.

[0031] The present invention also provides a normally open vacuum isolation hatch, which includes a valve plate and the normally open sealing structure described in any one of the above. End face flanges are provided on both sides of the box body and are respectively connected to the vacuum pipelines in a sealed manner. The two vacuum pipelines are coaxially arranged. The valve plate is slidably connected to the inside of the box body. The plate surface of the valve plate can move to or away from between the two vacuum pipelines. The first driving mechanism is connected to the valve plate. The sealing door is connected to the valve plate through the first driving mechanism. The spring force of the spring presses the sealing door against the valve plate. The sealing end face is the inner end face at the box body communication station.

[0032] By using the normally open vacuum isolation hatch of the present invention, the two vacuum pipelines can be sealed and isolated or the seal can be released through the sealing structure. By arranging the sealing structure on the valve plate, and the valve plate is slidably connected to the inside of the box body, the sealing structure can be located at or away from the position between the ends of the two vacuum pipelines along with the valve plate. When the sealing structure is away from the positions at the ends of the two vacuum pipelines, the spring force provided by the spring can push the sealing door towards and against the valve plate. At this time, there is a gap between the end face sealing ring and the plane where the sealing end face is located, and the two vacuum pipelines are communicated. When the vacuum isolation hatch needs to be closed to seal and isolate the two vacuum pipelines, the valve plate drives the sealing structure to move to the position between the ends of the two vacuum pipelines. The first driving mechanism pushes the spring guide sleeve to move, so that the sealing door approaches the sealing end face until it abuts against the sealing end face. The end face sealing ring presses against the sealing end face, and the two vacuum pipelines are sealed and isolated. This sealing structure can be adjusted independently in pressure. The structure of this normally open vacuum isolation hatch is simple, easy to use, and has good effects.

[0033] Preferably, at least one first through hole is provided on the sealing door, and the first through hole communicates both sides of the sealing door.

[0034] With this structure, during the process of the vacuum isolation hatch changing from closed to open or from open to closed, the sealing door is through from front to back. The pressure difference between the two vacuum pipelines directly acts on the valve plate instead of on the sealing door, making the force required to open and close the sealing door smaller. That is, a spring with a smaller spring force or a first driving mechanism with a smaller driving force can be used to push the sealing door to make the end face sealing ring approach or away from the sealing end face, which can reduce the cost of the spring and the first driving mechanism.

[0035] Further preferably, the sealing door includes a sealing ring and a sealing flange. The sealing flange is connected to the end of the sealing ring. The sealing ring and the sealing flange form a member with an L-shaped cross-section. An installation hole for installing the sealing door is provided on the valve plate. The outer ring surface of the sealing ring is slidably connected to the installation hole. An installation groove is provided on the outer ring surface of the sealing ring. A radial sealing ring and a guiding ring are provided in the installation groove. The radial sealing ring is in close contact with the installation hole.

[0036] With this structure, the sealing isolation on both sides of the installation hole is achieved through the radial sealing ring. The guiding ring supports the sealing ring in the installation hole and plays a protective role for the radial sealing ring.

[0037] Further preferably, the sealing ring and the sealing flange are integrally formed members.

[0038] Further preferably, guiding rings are provided on both sides of the radial sealing ring.

[0039] Further preferably, the guiding ring is an easily slidable and wear-resistant part.

[0040] Further preferably, the guiding ring is a polytetrafluoroethylene plate.

[0041] Further preferably, a grid structure is connected inside the sealing ring. The first through hole is provided on the grid structure.

[0042] With this structure, the grid structure enhances the rigidity of the sealing ring, makes the sealing door not easily deformed, has a good sealing effect, and also saves the material for manufacturing the sealing door.

[0043] Preferably, bumps are respectively provided at the top and bottom of the valve plate. A chute is provided inside the box body. The bumps are arranged in the chute to form a sliding guiding pair.

[0044] With this structure, the bumps on the valve plate and the chute inside the box body cooperate to form a sliding guiding pair, which is safe and reliable in guiding, has a high axial positioning accuracy, and bears the axial sealing force of the first driving mechanism and the pressure difference thrust of the vacuum pipeline, avoiding the problems of small axial bearing capacity and low positioning accuracy of the wheel-type guiding device in the prior art.

[0045] Further preferably, the chute is U-shaped.

[0046] Further preferably, the chute is arranged along the length direction of the box body.

[0047] Further preferably, the convex part of the bump has three working surfaces. A set of sliding plates is provided on each working surface. Each set of sliding plates includes several pieces. The sliding plates are attached to the inside of the chute.

[0048] Further preferably, the sliding plates are uniformly arranged.

[0049] Further preferably, the sliding plates are mounted on the bumps by fasteners.

[0050] Further preferably, the sliding plates are wear-resistant lubricating liners.

[0051] Further preferably, the sliding plates are self-lubricating wear-resistant liners.

[0052] Preferably, the normally-open vacuum isolation hatch further includes a second driving mechanism, and the second driving mechanism is a lead screw system, an oil cylinder system, a cylinder system, a pulley system, a rack and pinion system or a sprocket and chain system, etc. The fixing parts of the lead screw system, the oil cylinder system, the cylinder system, the pulley system, the rack and pinion system or the sprocket and chain system are connected to the box body, and the moving parts of the lead screw system, the oil cylinder system, the cylinder system, the pulley system, the rack and pinion system or the sprocket and chain system are connected to the valve plate.

[0053] Further preferably, the lead screw system includes a lead screw and a driver. The driver is located outside the box body and is sealed and fixed on the box body. The lead screw is connected inside the box body. The driver is connected to one end of the lead screw and can drive the lead screw to rotate. The lead screw is threadedly connected with a lead screw nut, and the lead screw nut is connected to the valve plate. The lead screw is arranged along the sliding direction of the valve plate.

[0054] With this structure, the rotation of the driver drives the rotation of the lead screw, and the rotation of the lead screw drives the lead screw nut to linearly reciprocate along the lead screw, thereby driving the valve plate to slide inside the box body.

[0055] Further preferably, the driver is connected to one end of the lead screw through a coupling, and the other end of the lead screw is connected to the rotary encoder through a coupling.

[0056] Further preferably, the lead screw is installed inside the box body through two lead screw bearing seats, and the lead screw bearing seats support the lead screw.

[0057] Further preferably, the lead screw nut is connected to the nut bearing seat, and the nut bearing seat is connected to the valve plate.

[0058] Further preferably, the driver is a motor.

[0059] Further preferably, the lead screw system further includes a rotary encoder, and the rotary encoder is connected inside the box body and is connected to the other end of the lead screw.

[0060] With this structure, the rotary encoder measures the angular displacement or angular velocity of the lead screw rotation, and cooperates with the pitch of the lead screw to control the moving distance of the lead screw nut, that is, the moving distance of the valve plate can be accurately controlled and accurately positioned.

[0061] Preferably, the box body includes a front half box body, a rear half box body and an end cover. The front half box body and the rear half box body are hermetically connected, and a box body seal is provided on the mating surface. The same end of the front half box body and the rear half box body is hermetically connected to the end cover, and an end cover seal is provided on the mating surface. The box body seal and the end cover seal are strip seals or plate seals, etc.

[0062] Further preferably, a spigot positioning is adopted between the mating surfaces of the front half box body, the rear half box body and the end cover.

[0063] Preferably, the box body is sequentially provided with three independent workstations. The workstation in the middle is a box body connection workstation communicating with the vacuum pipeline. On both sides of the box body connection workstation are the stop workstations for accommodating the valve plate. The box body connection workstations are distributed on the front and rear sides of the box body and are coaxially arranged. The box body connection workstation is a circular pipe with the same inner diameter as the vacuum pipeline, and a sealing end face is provided on the side of the box body connection workstation facing the valve plate.

[0064] Further preferably, a box body installation platform is provided at the bottom of the circular pipe of the box body connection workstation, and the box body installation platform is used to install the magnetic levitation motor bracket.

[0065] Further preferably, the valve plate is sequentially provided with two independent workstations, one is a valve plate sealing workstation, and the other is a valve plate connection workstation. The valve plate connection workstation is a circular pipe with the same inner diameter as the box body connection workstation, and a sealing door is provided at the valve plate sealing workstation.

[0066] In the initial state, the valve plate connection workstation is aligned with the box body connection workstation.

[0067] With this structure, when the valve plate moves once in the box body, the valve plate sealing workstation can be aligned with the box body connection workstation, while the valve plate connection workstation is away from the box body connection workstation, cutting off the two vacuum pipelines. Similarly, when resetting, the valve plate connection workstation is aligned with the box body connection workstation, while the valve plate sealing workstation is away from the box body connection workstation, connecting the two vacuum pipelines.

[0068] Further preferably, a valve plate installation platform is provided at the bottom of the circular pipe of the valve plate connection workstation, and the valve plate installation platform is used to install the magnetic levitation motor bracket.

[0069] The present invention also provides a bidirectional normally open vacuum isolation cabin door, including a normally open vacuum isolation cabin door as described in any of the above items, wherein two sets of normally open sealing structures as described in any of the above items are provided on the valve plate, and the two sealing doors are respectively located on both sides of the valve plate, and the two sealing doors are respectively used to seal the corresponding vacuum pipes.

[0070] By adopting the bidirectional normally open vacuum isolation cabin door described in the present invention, the two vacuum pipes connected to the box body are sealed separately by two sets of sealing structures, which has better sealing performance. When a single set of the sealing structures has problems and causes the seal to fail, the other set of the sealing structures can still effectively seal and separate the two adjacent vacuum pipes, thereby providing a reliable vacuum environment for the vacuum pipeline system. In addition, the spring forces of the springs in the two sets of the sealing structures or the driving forces of the first driving mechanisms are in opposite directions, and the spring forces acting on the valve plate or the driving forces of the first driving mechanisms can offset each other well, so that the axial thrust of the sliding guide pair of the valve plate and the box body is greatly reduced or even eliminated. The vacuum isolation cabin door has a simple structure, is easy to use, and has a good effect.

[0071] The present invention also provides a normally open vacuum pipeline closing method, using the normally open vacuum isolation door as described in any one of the above or the bidirectional normally open vacuum isolation door as described, the method comprising:

[0072] The valve plate slides in the box, and the valve plate and the sealing door are close to the two vacuum pipes, separating the two vacuum pipes;

[0073] The first driving mechanism pushes the sealing door to overcome the spring force of the spring, and the end face sealing ring is pushed to fit the sealing end face, so that the two vacuum pipes on both sides of the box body are sealed and isolated.

[0074] By adopting the normally open vacuum pipeline closing method described in the present invention, the pressure of the cylinder or hydraulic cylinder can be individually adjusted according to the different vacuum degrees of the pipeline to meet the different vacuum degree requirements of the pipeline; this method has simple steps, easy operation, few action steps, can respond quickly, and has good effect.

[0075] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0076] 1. The normally open sealing structure of the present invention does not require the first driving mechanism to work. The sealing door is pressed against the pipe end flange of the valve plate only by the spring force provided by the spring, so that the vacuum isolation door is normally open, which can effectively save the use cost. The first driving mechanism pushes the spring guide sleeve to make the sealing door abut against the sealing end face, so that the end face sealing ring is tightly attached to the sealing end face, so that the normally open vacuum isolation door is sealed and isolated, which can prepare for the pressure regulation of the vacuum pipeline. The normally open sealing structure has a simple principle, is easy to use, and has a good effect.

[0077] 2. A normally open vacuum isolation door described in the present invention can seal and isolate the two vacuum pipes or release the seal through the sealing structure. The sealing structure is arranged on the valve plate, and the valve plate is slidably connected to the box body, so that the sealing structure can move closer to or farther away from the position between the ends of the two vacuum pipes with the valve plate; when the sealing structure is away from the position between the ends of the two vacuum pipes, the spring force provided by the spring can make the sealing door close to the valve plate, at this time, there is a gap between the end face sealing ring and the plane where the sealing end face is located, and the two vacuum pipes are connected; when the vacuum isolation door needs to be closed and the two vacuum pipes are sealed and isolated, the valve plate drives the sealing structure to move to the position between the ends of the two vacuum pipes, the first driving mechanism pushes the spring guide sleeve to make the sealing door abut against the sealing end face, the end face sealing ring is close to the sealing end face, the two vacuum pipes are sealed and isolated, and can be pressure-regulated separately. The normally open vacuum isolation door has a simple structure, is easy to use, and has a good effect;

[0078] 3. A normally open vacuum isolation door of the present invention is preferably provided with at least one first through hole on the sealing door, wherein the first through hole is connected to both sides of the sealing door, and the sealing door is connected front to back during the process of the vacuum isolation door from closing to opening or from opening to closing, and the pressure difference between the two vacuum pipes directly acts on the valve plate instead of on the sealing door, so that the force for opening and closing the sealing door is relatively small, that is, the spring with a relatively small spring force or the first driving mechanism with a relatively small driving force can push the sealing door, so that the end face sealing ring is close to or away from the sealing end face, and the cost of the spring and the first driving mechanism can be reduced;

[0079] 4. In a preferred normally open vacuum isolation door of the present invention, the protrusion on the valve plate cooperates with the slide groove in the box body to form a sliding guide pair, which is safe and reliable in guiding, has high axial positioning accuracy, and bears the axial sealing force of the first driving mechanism and the pressure difference thrust of the vacuum pipeline, thus avoiding the problem of small axial bearing force and low positioning accuracy of the wheel guide device used in the prior art;

[0080] 5. The two-way normally open vacuum isolation hatch described in the present invention seals the two vacuum pipelines connected to the box body through two sets of sealing structures, having better sealing performance. When a problem occurs in a single set of the sealing structures resulting in sealing failure, the other set of the sealing structures can still effectively seal and isolate the adjacent two vacuum pipelines, providing a reliable vacuum environment for the vacuum pipeline system. In addition, the spring forces of the springs or the driving forces of the first driving mechanisms in the two sets of the sealing structures are in opposite directions, and the spring forces or the driving forces of the first driving mechanisms acting on the valve plate can well cancel each other out, greatly reducing or even eliminating the axial thrust received by the sliding guide pair formed by the valve plate and the box body. This vacuum isolation hatch has a simple structure, is convenient to use, and has good effects.

[0081] 6. The normally open vacuum pipeline closing method described in the present invention can separately adjust the pressure of the cylinder or hydraulic cylinder according to different vacuum degrees of the pipeline, meeting the requirements of different vacuum degrees of the pipeline. This method has simple steps, is convenient to operate, has few action steps, can respond quickly, and has good effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 It is a schematic cross-sectional structure diagram of the one-way normally open vacuum isolation hatch in the normally open state;

[0083] Figure 2 It is a schematic cross-sectional structure diagram of the one-way normally open vacuum isolation hatch in the closed state;

[0084] Figure 3 It is a schematic top view structure diagram of the one-way normally open vacuum isolation hatch;

[0085] Figure 4 For Figure 1 The schematic cross-sectional structure diagram of the A'-A' section in

[0086] Figure 5 For Figure 1 The schematic cross-sectional structure diagram of the B'-B' section in

[0087] Figure 6 For Figure 2 The schematic cross-sectional structure diagram of the C'-C' section in

[0088] Figure 7 For Figure 6 The enlarged structure diagram of the D' part in

[0089] Figure 8 For Figure 7 The schematic cross-sectional structure diagram of the F-F section in

[0090] Figure 9 It is a schematic longitudinal section structure diagram of the two-way normally open vacuum isolation hatch in the closed state;

[0091] Figure 10 is Figure 9 An enlarged structural schematic diagram of part E' in

[0092] Figure 11 is Figure 10 A sectional structural schematic diagram of G-G in

[0093] Markings in the figure: 01 - Vacuum pipeline, 1 - Box body, 11 - Front half box body, 12 - Rear half box body, 13 - End cover, 14 - Box body seal, 15 - End cover seal, 16 - Box body connection station, 17 - Box body installation platform, 18 - Slide groove, 19 - Sealing end face, 191 - Limit sensor, 2 - Valve plate, 21 - Valve plate sealing station, 211 - Annular pipe, 212 - Pipe end flange, 22 - Valve plate connection station, 23 - Sealing door, 231 - First through hole, 232 - Radial sealing ring, 233 - Guide ring, 234 - End face sealing ring, 235 - Sealing pressure ring, 24 - Protrusion, 241 - Slide plate, 25 - Cylinder or hydraulic cylinder, 26 - Pull rod, 261 - Locking nut, 263 - Spline keyboard, 264 - Rod body, 27 - Spring, 28 - Spring guide sleeve, 281 - Spline tooth, 29 - Valve plate installation platform, 3 - Second driving mechanism, 31 - Lead screw, 32 - Driver, 33 - Lead screw bearing seat, 34 - Nut bearing seat, 35 - Rotary encoder, 4 - Pipe fitting, 41 - Ring pipe, 42 - Hose. Detailed implementation manners

[0094] The present invention will be described in detail below with reference to the accompanying drawings.

[0095] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0096] Embodiment 1

[0097] As Figures 1 to 8 shown, a vacuum isolation hatch door according to the present invention includes a box body 1, a valve plate 2, a first driving mechanism 3 and a pipe fitting 4, and it is a normally open door.

[0098] As Figures 1 to 3As shown, 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 to form a right box body through a spigot, a joint surface and bolts. A sealing groove is machined on the joint surface, and a box body seal 14 is installed therein. The left end face of the right box body is machined with a spigot and a joint surface for positioning the end cover 13. The right box body and the end cover 13 are connected by bolts. A sealing groove is machined on the joint surface, and an end cover seal 15 is installed therein. 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.

[0099] As Figures 1 to 3 shown, the box body 1 is provided with three independent workstations. The workstation in the middle is a box body communication workstation 16, and the workstations on the left and right are respectively stay workstations for accommodating the valve plate 2. The box body communication workstation 16 is distributed on the front and rear sides of the box body 1, that is, one box body communication workstation 16 is respectively provided on the front half box body 11 and the rear half box body 12. The box body communication workstation 16 is a circular pipe with the same inner diameter as the vacuum pipeline 01. The two box body communication workstations 16 are opposite and coaxially arranged.

[0100] As Figure 6 shown, both ends of the box body communication workstation 16 are provided with flange plates. The flange plate facing the outside of the box body 1 is used for flange sealing connection with the corresponding vacuum pipeline 01. The space between the flange plates facing the inside of the box body 1 is an installation space for setting the valve plate 2, and the flange surface of the flange plate facing the inside of the box body 1 serves as a sealing end face 19. A limit sensor 191 is arranged on the adjacent surface of the sealing end face 19. The limit sensor 191 can be a proximity switch, a limit switch or other position detection sensors. In this embodiment, a proximity switch is adopted. The adjacent surface can be the inner ring surface of the flange plate or the outer ring surface of the flange plate.

[0101] As Figure 4 shown, a box body installation platform 17 is arranged at the bottom of the circular pipe of the box body communication workstation 16. The box body installation platform 17 is used for installing a magnetic levitation motor bracket.

[0102] As Figure 1 、 Figure 2 、 Figures 4 to 7 shown, sliding grooves 18 are respectively arranged on the inner top surface and the inner bottom surface of the box body 1 from left to right, that is, the sliding grooves 18 are arranged along the length direction of the front half box body 11 and the rear half box body 12. The sliding grooves 18 are U-shaped.

[0103] As Figure 1 and Figure 2As shown in the figure, the valve plate 2 is provided with two independent working stations. The left side is the valve plate sealing station 21, and the right side is the valve plate communication station 22. The valve plate communication station 22 is a circular tube with the same inner diameter as the box body communication station 16. At the bottom of the circular tube of the valve plate communication station 22, there is a valve plate mounting table 29, which is used to mount the magnetic suspension motor bracket. At the valve plate sealing station 21, there is a sealing door 23. The sealing door 23 on the valve plate 2 and the sealing end face 19 on the box body 1 cooperate with each other to form a sealing structure.

[0104] As Figure 6 and Figure 7 As shown in the figure, the valve plate sealing station 21 is formed by welding an annular tube 211, a tube end flange 212, internal webs and ribs, and external webs and ribs, and is an integral structure with the valve plate 2. An installation hole for installing the sealing door 23 is provided in the annular tube 211. The sealing door 23 includes a sealing ring and a sealing flange. The sealing flange is connected to the end 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 outer ring surface of the sealing ring is slidably connected to the installation hole of the annular tube 211. An installation groove is provided on the outer ring surface of the sealing ring, in which a radial sealing ring 232 and a guide ring 233 are provided. The guide rings 233 are provided on both sides of the radial sealing ring 232. The radial sealing ring 232 is closely attached to the installation hole. The guide ring 233 is an easily sliding and wear-resistant part. In this embodiment, a polytetrafluoroethylene plate is used. The sealing isolation on both sides of the installation hole is realized through the radial sealing ring 232. The guide ring 233 supports the sealing ring in the installation hole and plays a protective role for the radial sealing ring 232.

[0105] As Figure 7 As shown in the figure, the inside of the sealing ring is a grid structure. The grid structure enhances the rigidity of the sealing ring, makes the sealing door 23 not easily deformed, has a good sealing effect, and also saves the material for manufacturing the sealing door 23. At least one first through hole 231 is provided on the grid structure. The first through hole 231 communicates the front and back sides of the sealing door 23, so that the front and back of the sealing door 23 are through. This avoids the force generated by the pressure difference on both sides directly acting on the sealing door 23 when the front and back are not through, resulting in a greatly increased force required to open and close the sealing door 23 and an increased manufacturing cost.

[0106] As Figure 6 and Figure 7As shown, the sealing flange is located between the mounting hole and the sealing end face 19. A stepped positioning groove is provided on one side of the sealing flange facing the sealing end face 19. An end face sealing ring 234 and a sealing pressure ring 235 are arranged in the stepped positioning groove. The inner ring of the end face sealing ring 234 is sleeved on the stepped surface of the stepped positioning groove, and the sealing pressure ring 235 presses on the outer ring of the end face sealing ring 234. The sealing pressure ring 235 is used to ensure that the end face sealing ring 234 can work properly and is not damaged by the sealing end face 19. The limit sensor 191 is used to detect the approach of the sealing door 23 and also prevent the sealing end face 19 and the sealing flange from damaging the end face sealing ring 234.

[0107] As Figures 6 to 8 shown, a first driving mechanism is provided on the valve plate 2. The first driving mechanism includes a plurality of cylinders or hydraulic cylinders 25, and the cylinders or hydraulic cylinders 25 are evenly arranged along the circumference of the sealing door 23. As Figure 1 and Figure 2As shown, in this embodiment, 12 of the cylinders or hydraulic cylinders 25 are evenly distributed. An installation spigot is provided on the valve plate 2. The cylinders or hydraulic cylinders 25 are fixedly connected to the valve plate 2 through bolts and the installation spigot. A cylindrical hole spigot is machined at the end of the piston rod of the cylinders or hydraulic cylinders 25. The pull rod 26 is a composite part composed of a spline plate 263 and a rod body 264. A spline groove matching the spline teeth 281 is machined in the spline plate 263. A thread matching the lock nut 261 is machined at the left end of the rod body 264. The right end of the spring guide sleeve 28 is machined with the spline teeth 281 evenly distributed in the radial direction and matching the spline groove of the spline plate 263. A stepped cylindrical surface is machined at the front section of the spline teeth 281. The pull rod 26 passes through the inner hole at the right end of the spring guide sleeve 28 and exits from the left end. The spline teeth 281 pass through the spline groove of the spline plate 263. The stepped cylindrical surface of the spline teeth 281 is inserted into the cylindrical hole spigot at the end of the piston rod of the cylinders or hydraulic cylinders 25 and is in close contact with the spigot end face. Second through holes and third through holes corresponding to the cylinders or hydraulic cylinders 25 are provided on the pipe end flange 212 and the sealing flange. The other end of the spring guide sleeve 28 passes through the second through hole on the corresponding pipe end flange 212 and is in close contact with the right side surface of the sealing flange. The other end of the pull rod 26 passes through the third through hole on the corresponding sealing flange and is connected and locked by the outer lock nut 261. The spring 27 is sleeved on the outer cylindrical surface of the spring guide sleeve 28. One end of the spring 27 is in close contact with the left side of the spline plate 263. The other end of the spring 27 is in close contact with the right side of the pipe end flange 212. The spring 27 is installed with pre-compression. Under the action of the pre-compression force of the spring 27, the pull rod 26 pulls the sealing door 23 to move rightward through the spline plate 263 and the lock nut 261 at the right end of the pull rod 26, so that the sealing door 23 abuts against the left end face of the pipe end flange 212, and pushes the spring guide sleeve 28 to move rightward and abut against the piston rod spigot end face of the cylinders or hydraulic cylinders 25, so that the sealing door 23 is in an open state for a long time. When the cylinders or hydraulic cylinders 25 work, they push the spring guide sleeve 28 to move leftward. The spring guide sleeve 28 pushes the sealing door 23 to approach the sealing end face 19 until it abuts against the sealing end face 19. The end face sealing ring 234 on the sealing door 23 closely adheres to the sealing end face 19 to realize the sealing partition of the front and rear two communication stations 16 of the box body 1, so that the sealing door 23 is in a closed state.

[0108] As Figure 1 , Figure 2 , Figures 4 to 7As shown, bumps 24 are respectively arranged at the top and bottom of the valve plate 2. The bumps 24 are installed in cooperation with the mounting grooves on the valve plate 2 through fasteners. The convex parts of the bumps 24 have three working surfaces, and a set of sliding plates 241 are arranged on each working surface. Each set of the sliding plates 241 includes several, and the sliding plates 241 are evenly arranged and installed on the bumps 24 through fasteners. The bumps 24 are arranged in the chute 18 to form a sliding guide pair in cooperation. The sliding plates 241 are attached to the inside of the chute 18. Through the cooperation of the bumps 24 and the chute 18, the valve plate 2 and the box body 1 are slidably connected. The sliding plates 241 are wear-resistant lubricating liners, and self-lubricating wear-resistant liners are adopted in this embodiment. When the valve plate 2 is maintained, only need to open the end cover 13 and pull out the valve plate 2 along the chute 18 from one side of the end cover 13, which is extremely convenient.

[0109] As Figures 1 to 3 , Figure 5 shown, 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 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 the staying station of the box body 1 to the box body communication station 16. The lead screw bearing seat 33 supports the lead screw 31. The lead screw 31 is threadedly connected 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 rotation of the motor drives the rotation of the lead screw 31. The rotation of the lead screw 31 drives the lead screw nut to move linearly 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 displacement or angular velocity of the rotation of the lead screw 31. By combining the pitch of the lead screw 31 to control the moving distance of the lead screw nut, the moving distance of the valve plate 2 can be accurately controlled and accurately positioned, so that 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, so that the valve plate 2 can close or conduct the vacuum pipeline 01.

[0110] In some specific embodiments, the second driving mechanism 3 is an oil cylinder system. The oil cylinder system includes a driving oil cylinder. The cylinder body of the driving oil cylinder is hinged in the box body 1, and the telescopic rod of the driving oil cylinder is hinged to the valve plate 2. The driving oil cylinder is a servo oil cylinder, an oil cylinder with a built-in linear displacement sensor, an oil cylinder with a built-in wire-drawing displacement sensor, etc., which can accurately control the stroke of the telescopic rod of the oil cylinder to achieve precise control of the position of the valve plate 2 in the box body 1. A linear displacement sensor can also 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, ensuring that 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.

[0111] In some specific embodiments, the second driving mechanism 3 is a cylinder system. The cylinder system includes a driving cylinder. The cylinder body of the driving cylinder is hinged in the box body 1, and the telescopic rod of the driving cylinder is hinged to the valve plate 2. The driving cylinder is a servo cylinder, a cylinder with a built-in linear displacement sensor, a cylinder with a built-in wire-drawing displacement sensor, etc., which can accurately control the stroke of the telescopic rod of the cylinder to achieve precise control of the position of the valve plate 2 in the box body 1. A linear displacement sensor can also 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, ensuring that 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.

[0112] In some specific embodiments, the second driving mechanism 3 is a pulley system. The pulley system includes a driving pulley, a driven pulley and a belt. The belt is connected to the driving pulley and the driven pulley. The driving pulley and the driven pulley are connected to the box body 1, and the belt is connected to the valve plate 2. The shaft of the driving pulley is connected to a motor and a rotary encoder through a coupling. The rotary encoder is used to detect and control the position of the valve plate 2. A linear displacement sensor can also 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, ensuring that 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.

[0113] In some specific embodiments, the second driving mechanism 3 is a gear rack system, which includes a gear and a rack meshing therewith, the gear is connected to the housing 1, the rack is connected to the valve plate 2, the shaft of the gear is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also be directly arranged between the housing 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; and ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the housing connecting station 16 respectively.

[0114] In some specific embodiments, the second driving mechanism 3 is a sprocket chain system, which includes a sprocket and a chain matching therewith, the sprocket is connected to the box body 1, the chain is connected to the valve plate 2, the shaft of the sprocket is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also 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; to ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0115] like Figure 1 and Figure 5 As shown, the piping 4 includes a circular tube 41 and a hose 42. The circular tube 41 is connected to all the air cylinders or hydraulic cylinders 25 at the same time through a pipe joint. A through-box joint is provided on the box body 1. The through-box joint is connected to the hose 42 inside and to the pipe from the air station or hydraulic station outside. The hose 42 is connected to the circular tube 41.

[0116] The vacuum isolation hatch, such as Figure 1 , Figure 4 and Figure 5 As shown, under normal circumstances, the valve plate connecting station 22 is aligned with the box connecting station 16, and the valve plate sealing station 21 is located at the stop station of the box 1, so that the front and rear vacuum pipes 01 are connected to the valve plate connecting station 22 through the box connecting station 16. The sealing door 23 of the valve plate sealing station 21 is pulled toward the pipe end flange 212 through the pull rod 26 and abuts against the left end face of the pipe end flange 212 under the thrust generated by the pre-compression force of the spring 27. The end face sealing ring 234 is away from the sealing end face 19, and the vacuum isolation door is in a normally open state. When it is necessary to seal and isolate the front and rear vacuum pipes 01, 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 toward the box connecting station 16 and aligns, as shown in FIG. Figure 2As shown, while the valve plate communicating station 22 moves towards the staying station of the box body 1, the front and rear vacuum pipelines 01 are blocked by the valve plate 2. Then, the air cylinder or hydraulic cylinder 25 operates, and the piston rod of the air cylinder or hydraulic cylinder 25 and the spring guide sleeve 28 push the sealing door 23 towards the sealing end face 19 until it abuts against the sealing end face 19. The end face sealing ring 234 fits onto the sealing end face 19, so that the sealing door 23 is in a closed state, realizing the sealed closing of the vacuum isolation hatch. At the same time, the sealing door 23 pushes the spring 27 to compress leftward through the flower keyboard 263; Whether the sealing door 23 is closed in place can be detected and controlled by the limit sensor 191 to avoid the collision between the sealing door 23 and the sealing end face 19 and damage the end face sealing ring 234. When sealing is not required, the air cylinder or hydraulic cylinder 25 stops working and releases pressure. Under the thrust of the released compression force of the spring 27, the sealing door 23 pushes the pull rod 26 to move rightward, and the locking nut 261 pulls the sealing door 23 to move rightward until it abuts against the left end face of the pipe end flange 212. The sealing door 23 pushes the spring guide sleeve 28 to move rightward, and the spring guide sleeve 28 pushes the piston rod of the air cylinder or hydraulic cylinder 25 to move rightward until it returns to the initial position of the piston rod. The sealing door 23 is in an open state. At the same time, the second driving mechanism 3 drives the valve plate 2 to slide in the box body 1, so that the valve plate sealing station 21 moves towards the staying station of the box body, and the valve plate communicating station 22 is aligned with the box body communicating station 16, making the vacuum isolation hatch in an open state.

[0117] The beneficial effects of the normally open vacuum isolation hatch described in this embodiment are as follows:

[0118] 1. By setting three independent stations in the box body 1 and two independent stations on the valve plate 2, and arranging the valve plate 2 entirely in the box body 1, the mating surfaces of the end cover 13, the front half box body 11, and the rear half box body 12, which are components of the box body 1, are positioned by rabbets, and sealed by the box body seal 14 and the end cover seal 15, ensuring the sealing performance of the vacuum isolation hatch and providing a reliable vacuum environment for the vacuum pipeline system;

[0119] 2. When maintaining and servicing the valve plate 2, only need to open the end cover 13 and pull out the valve plate 2 from one side of the end cover 13 along the sliding groove 18, which is extremely convenient for maintenance and servicing;

[0120] 3. Two independent stations are set on the valve plate 2. By driving the valve plate 2 to move back and forth through the second driving mechanism 3, the reliable switching between the valve plate sealing station 21 and the valve plate communicating station 22 is realized, and the connection and sealed closing with the box body communicating station 16 are completed;

[0121] 4. Without the need for the first driving mechanism to operate, the sealing door 23 is attached to the valve plate 2 only by the spring pre-compression force provided by the spring 27, achieving the normally open state of the vacuum isolation hatch, which can effectively save the usage cost.

[0122] 5. The bump 24 on the valve plate 2 and the chute 18 in the box body 1 cooperate to form a sliding guide pair, which is safe and reliable in guiding, has high axial positioning accuracy, and bears the axial sealing force of the first driving mechanism and the differential pressure thrust of the vacuum pipeline 01, avoiding the problems of small axial load-bearing capacity and low positioning accuracy of the wheel-type guiding device in the prior art.

[0123] 6. The first driving mechanism adopts a plurality of cylinders or hydraulic cylinders 25, which are evenly arranged along the circumference of the sealing door 23. The sealing force received by the end face sealing ring 234 is uniform along the entire circumference, and the sealing is safe and reliable.

[0124] 7. The distribution circle diameter and the configured quantity of the cylinders or hydraulic cylinders 25 can be set according to the diameter of the vacuum pipeline 01 and requirements, and are applicable to large and extra-large vacuum pipeline systems.

[0125] 8. The middle part of the sealing door 23 is designed as a grid structure. First, it enhances the rigidity of the sealing door 23, is not prone to deformation, and has a good sealing effect. Second, through the first through hole 231, the sealing door 23 is penetrated front and back. Only the driving force of a relatively small cylinder or hydraulic cylinder 25 is required to realize the sealing of the sealing door 23 to the box body connection station 16 of the box body, avoiding the force generated by the pressure difference on both sides directly acting on the sealing door 23 when it is not penetrated front and back. This can not only avoid the increase in the force required to open and close the sealing door 23, and the need to increase the spring pre-compression force provided by the spring 27 to open the sealing door 23 and the driving force of the cylinder or hydraulic cylinder 25 to close the sealing door 23, resulting in an increase in manufacturing cost, but also avoid the increase in the force on components such as the end face sealing ring 234 and the sealing door 23, and the need to improve or strengthen their stiffness and strength, increasing the manufacturing cost.

[0126] The structure of this vacuum isolation hatch is simple, easy to use, and has good effects.

[0127] Embodiment 2

[0128] As Figures 9 to 11 shown, a vacuum isolation hatch of the present invention is a two-way normally open vacuum isolation hatch. The difference from Embodiment 4 is that in this embodiment, two sets of the sealing structures are provided on the sealing station 21 of the valve plate 2, and two sealing doors 23 are respectively located on both sides of the valve plate sealing station 21. The two sealing doors 23 are respectively used to seal the box body connection station 16 of the front half box body 11 and the box body connection station 16 of the rear half box body 12.

[0129] The two-way normally-open vacuum isolation hatch described in this embodiment has the following beneficial effects in addition to the beneficial effects of Embodiment 1:

[0130] 1. For the vacuum isolation hatch described in this embodiment, when it needs to be closed, two sets of the sealing structures are used to respectively seal the two box body communication stations 16 of the box body 1, which has better sealing performance. In the case where a problem occurs in a single set of the sealing structures resulting in sealing failure, the other set of the sealing structures can still effectively seal and isolate the adjacent two vacuum pipelines 01, providing a reliable vacuum environment for the vacuum pipeline system;

[0131] 2. The driving forces of the first driving mechanisms in the two sets of the sealing structures are opposite to each other, and the driving reaction forces acting on the valve plate 2 can be well offset from each other, so that the axial thrust received by the sliding guiding pair composed of the convex block 24 and the sliding groove 18 is greatly reduced or even eliminated. This vacuum isolation hatch has a simple structure, is convenient to use, and has good effects.

[0132] Embodiment 3

[0133] As Figures 1 to 11 shown, for the usage method of a vacuum isolation hatch described in the present invention, by using a vacuum isolation hatch as described in Embodiment 4 or Embodiment 5, the two vacuum pipelines 01 on both sides of the vacuum isolation hatch are in the same vacuum state or the same non-vacuum state, and there is no pressure difference between the two sides. This method includes the following steps:

[0134] The driver 32 drives the lead screw 31 to rotate. The rotation of the lead screw 31 drives the lead screw nut to move linearly from left to right, thereby driving the valve plate 2 to move from left to right in the box body 1 along the sliding groove 18. As Figure 1 and Figure 2 shown, the valve plate communication station 22 enters the stay station of the box body 1, and the valve plate sealing station 21 aligns with the box body communication station 16, so that the vacuum pipelines 01 on both sides of the vacuum isolation hatch are blocked by the valve plate 2;

[0135] The cylinder or hydraulic cylinder 25 acts to overcome the pre-compression force of the spring 27. Through the piston rod of the cylinder or hydraulic cylinder 25, the spring guide sleeve 28 and the pull rod 26, the sealing door 23 is pushed outwards close to the box body sealing end face 19 and away from the pipe end flange 212. The spring 27 is compressed, the end face sealing ring 234 is in close contact with the sealing end face 19, and 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 both sides of the vacuum isolation hatch are sealed and isolated, and the two vacuum pipelines 01 can be adjusted separately in pressure.

[0136] A method for closing a vacuum pipeline according to this embodiment drives the valve plate 2 to slide in the box body 1 through the driver 32, so that the valve plate sealing station 21 is aligned with the box body communication station 16, the valve plate communication station 22 is separated from the box body communication station 16, and the vacuum pipeline 01 is cut off; then, the cylinder or hydraulic cylinder 25 acts to overcome the pre-compression force of the spring 27, and the driving force of the cylinder or hydraulic cylinder 25 makes the end face sealing ring 234 press tightly against the sealing end face 19, and the vacuum pipeline 01 is sealed and isolated. Since the first through hole 231 is provided on the sealing door 23, there is no pressure difference on both sides of the sealing door 23, and the pressure difference of the vacuum pipeline 01 acts on the valve plate 2 and is then transmitted to the connection between the valve plate 2 and the box body 1, that is, the sliding guide pair. The sliding guide pair is composed of the convex block 24 and the sliding groove 18, with high axial positioning accuracy, and can well bear the axial thrust of the cylinder or hydraulic cylinder 25 and the pressure difference thrust. This method has simple steps, convenient operation, few action steps, can respond quickly, and has good effects.

[0137] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A normally open sealing structure, comprising a box body (1) and a sealing door (23), characterized in that, a sealing end face (19) and a first driving mechanism are provided inside the box body (1), the sealing door (23) and the first driving mechanism are arranged on a valve plate (2) inside the box body (1), an end face sealing ring (234) and a spring (27) are provided on the sealing door (23), two ends of the spring (27) respectively act on end faces of a pipe end flange (212) and a flower-shaped key plate (263), the spring (27) is pre-compressed and installed, the sealing door (23) is abutted against the pipe end flange (212) by the spring force of the spring (27), so that the end face sealing ring (234) is away from the sealing end face (19), and the first driving mechanism can drive the sealing door (23) to press against the sealing end face (19) and compress the spring (27), so that the end face sealing ring (234) is closely attached to the sealing end face (19); the sealing door (23) is arranged on the valve plate (2), and a plurality of the springs (27) are circumferentially and uniformly arranged on the sealing door (23); corresponding pull rods (26) are arranged along the circumferential direction where the springs (27) are uniformly arranged, the pull rod (26) comprises a flower-shaped key plate (263) and a rod body (264), the flower-shaped key plate (263) and the rod body (264) form an integral structure, a spring guide sleeve (28) is sleeved outside the rod body (264), and the spring (27) is sleeved outside the spring guide sleeve (28); the first driving mechanism comprises a plurality of cylinders or hydraulic cylinders (25) corresponding to the pull rods (26), 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 spring guide sleeves (28); a pipe end flange (212) is provided on the valve plate (2), and the pipe end flange (212) is located on one side of the sealing door (23); a stepped positioning groove is provided on the side of the sealing door (23) facing the sealing end face (19), and the end face sealing ring (234) is installed in the stepped positioning groove; the inner ring of the end face sealing ring (234) is sleeved on the stepped surface of the stepped positioning groove, and a sealing pressing ring (235) is matched with the outer ring of the end face sealing ring (234).

2. The normally open sealing structure according to claim 1, characterized in that, The flower keyboard (263) is provided with spline grooves matching the spring guide sleeve (28). One end of the spring guide sleeve (28) is provided with spline teeth (281) matching the spline grooves of the flower keyboard (263). The spline teeth (281) pass through the spline grooves of the flower keyboard (263) and abut against the piston rod end of the cylinder or hydraulic cylinder (25) and are connected to the piston rod end in a matching manner. The other end of the spring guide sleeve (28) passes through and is slidably connected to the pipe end flange (212) and abuts against the sealing door (23). One end of the spring (27) abuts against the pipe end flange (212), and the other end abuts against the flower keyboard (263). Under the spring force of the spring (27), the sealing door (23) pushes the pull rod (26) to pull the sealing door (23) towards and abut against the pipe end flange (212) away from the sealing end face (19). The piston rod of the cylinder or hydraulic cylinder (25) can push the spring guide sleeve (28) to move axially, thereby pushing the sealing door (23) close to the sealing end face (19) so that the end face sealing ring (234) closely adheres to the sealing end face (19).

3. The normally open sealing structure according to claim 1, characterized in that, it further includes a pipe (4), and 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. A through-box joint is provided on the box body (1). The inside of the through-box joint is connected to the hose (42), and the outside is connected to a gas station or a hydraulic station. The hose (42) is connected to the circular pipe (41).

4. The normally open sealing structure according to claim 1, characterized in that, the end face sealing ring (234) is a trapezoidal sealing ring, an O-ring or other sealing rings.

5. The normally open sealing structure according to any one of claims 1-4, characterized in that, a limit sensor (191) is provided on the adjacent surface of the sealing end face (19). The limit sensor (191) is a proximity switch, a limit switch or other position detection sensors.

6. A normally open vacuum isolation hatch, characterized in that, it includes a valve plate (2) and the normally open sealing structure according to any one of claims 1-5. End face flanges are provided on both sides of the box body (1) and are respectively and hermetically connected to the vacuum pipelines (01). The two vacuum pipelines (01) are coaxially arranged. The valve plate (2) is slidably connected inside the box body (1). The plate surface of the valve plate (2) can move to or away from between the two vacuum pipelines (01). The first driving mechanism is connected to the valve plate (2). The sealing door (23) is connected to the valve plate (2) through the first driving mechanism. The spring force of the spring (27) presses the sealing door (23) against the pipe end flange (212). The sealing end face (19) is the end face of the vacuum pipeline (01).

7. The normally open vacuum isolation hatch according to claim 6, characterized in that, At least one first through hole (231) is provided on the sealing door (23), and the first through hole (231) communicates with both sides of the sealing door (23).

8. The normally open vacuum isolation hatch door according to claim 7, characterized in that the sealing door (23) includes a sealing ring and a sealing flange. The sealing flange is connected to the end of the sealing ring. The sealing ring and the sealing flange form a member with an L-shaped cross-section. An installation hole for installing the sealing door (23) is provided on the valve plate (2). The outer ring surface of the sealing ring is slidably connected in the installation hole. An installation groove is provided on the outer ring surface of the sealing ring, and a radial sealing ring (232) and a guide ring (233) are provided in the installation groove. The radial sealing ring (232) is closely attached to the installation hole.

9. The normally open vacuum isolation hatch door according to claim 8, characterized in that a grid structure is connected inside the sealing ring, and the first through hole (231) is provided on the grid structure.

10. The normally open vacuum isolation hatch door according to claim 6, characterized in that protrusions (24) are respectively provided at the top and bottom of the valve plate (2). A chute (18) is provided inside the box body (1). The protrusions (24) are arranged in the chute (18) to form a sliding guide pair.

11. The normally open vacuum isolation hatch door according to claim 10, characterized in that the convex part of the protrusion (24) has three working surfaces, and a set of sliding plates (241) is provided on each working surface. Each set of the sliding plates (241) includes several, and the sliding plates (241) are attached to the inside of the chute (18).

12. The normally open vacuum isolation hatch door according to claim 6, characterized in that it further includes a second driving mechanism (3). The second driving mechanism (3) is a lead screw system, an oil cylinder system, a cylinder system, a pulley system, a gear rack system or a sprocket chain system. The fixed parts of the lead screw system, the oil cylinder system, the cylinder system, the pulley system, the gear rack system or the sprocket chain system are connected to the box body (1), and the moving parts of the lead screw system, the oil cylinder system, the cylinder system, the pulley system, the gear rack system or the sprocket chain system are connected to the valve plate (2).

13. The normally open vacuum isolation hatch door according to claim 12, characterized in that the lead screw system includes a lead screw (31) and a driver (32). The driver (32) is located outside the box body (1) and is sealed and fixed on the box body (1). The lead screw (31) is connected inside the box body (1). The driver (32) is connected to one end of the lead screw (31) and can drive the lead screw (31) to rotate. The lead screw (31) is threadedly connected with a lead screw nut, and the lead screw nut is connected to the valve plate (2). The lead screw (31) is arranged along the sliding direction of the valve plate (2).

14. The normally open vacuum isolation hatch door according to claim 13, characterized in that The lead screw system further includes a rotary encoder (35), which is connected inside the box body (1), and the rotary encoder (35) is connected to the other end of the lead screw (31).

15. The normally open vacuum isolation hatch door according to claim 6, characterized in that 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 hermetically connected, and a box body seal (14) is provided on the mating surface. The same end of the front half box body (11) and the rear half box body (12) is hermetically connected to the end cover (13), and an end cover seal (15) is provided on the mating surface. The box body seal (14) and the end cover seal (15) are strip seals or plate seals.

16. The normally open vacuum isolation hatch door according to claim 6, characterized in that the box body (1) is sequentially provided with three independent workstations. The workstation in the middle is a box body communication workstation (16) communicating with the vacuum pipeline (01). On both sides of the box body communication workstation (16) are the stay workstations for accommodating the valve plate (2). The box body communication workstation (16) is distributed on the front and rear sides of the box body (1) and is coaxially arranged. The box body communication workstation (16) is a circular pipe having the same inner diameter as the vacuum pipeline (01). A sealing end face (19) is provided on one side of the box body communication workstation (16) facing the valve plate (2).

17. The normally open vacuum isolation hatch door according to claim 16, characterized in that the valve plate (2) is sequentially provided with two independent workstations, one is a valve plate sealing workstation (21), and the other is a valve plate communication workstation (22). The valve plate communication workstation (22) is a circular pipe having the same inner diameter as the box body communication workstation (16). A sealing door (23) is provided at the valve plate sealing workstation (21).

18. A two-way normally open vacuum isolation hatch door, characterized in that it includes the normally open vacuum isolation hatch door according to any one of claims 6-17. Two sets of normally open sealing structures according to any one of claims 1-5 are provided on the valve plate (2). The two sealing doors (23) are respectively located on both sides of the valve plate (2), and the two sealing doors (23) are respectively used to seal the corresponding vacuum pipelines (01).

19. A method for closing a normally open vacuum pipeline, characterized in that using the normally open vacuum isolation hatch door according to any one of claims 6-17 or the two-way normally open vacuum isolation hatch door according to claim 18, the method includes: the valve plate (2) slides inside the box body (1), the valve plate (2) and the sealing door (23) are close to between the two vacuum pipelines (01), and the two vacuum pipelines (01) are cut off; the first driving mechanism pushes the sealing door (23) to overcome the spring force of the spring (27), and the end face sealing ring (234) is pushed to fit against the sealing end face (19), and the two vacuum pipelines (01) on both sides of the box body (1) are sealed and isolated from each other.

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