CN113464673A

CN113464673A - Underwater sealing gate for nuclear fuel transfer

Info

Publication number: CN113464673A
Application number: CN202110577410.2A
Authority: CN
Inventors: 苏子威; 张鑫; 李建奇; 张洪军; 唐兴贵; 袁佩
Original assignee: China Nuclear Power Engineering Co Ltd
Current assignee: China Nuclear Power Engineering Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-10-01

Abstract

The invention relates to an underwater sealing gate for nuclear fuel transfer, which comprises a gate body, a gate operating mechanism and a transmission mechanism, wherein the gate body comprises a valve body, a gate plate and a valve rod, a valve cover is arranged at the upper part of the valve body, a sealing surface is formed between the valve body and the gate plate, the gate plate is driven by the valve rod to do linear lifting motion along the sealing surface, the valve rod is connected with the transmission mechanism, the transmission mechanism is connected with the gate operating mechanism, a gate support is arranged below the gate body and used for supporting the gate body and a mechanism above the gate body, the gate support comprises a pressing seat arranged above an elastic device, the pressing seat can rotate up and down along a rotating shaft to adjust the position, and the bottom of the gate body is arranged on the pressing seat. The invention has the advantages of reliable structure sealing, small opening and closing operation torque, simplified structure and convenient decontamination maintenance. The gate support can absorb the gate displacement in the axial direction and the horizontal direction simultaneously, and the position of the gate is adjusted.

Description

Underwater sealing gate for nuclear fuel transfer

Technical Field

The invention relates to a gate structure, in particular to an underwater sealing gate for nuclear grade fuel transfer.

Background

The fuel transfer underwater sealing gate is positioned in a fuel transfer cabin and is an important functional component of a nuclear power fuel transfer device. The flange is used as a spare part of a blind flange during the operation of the reactor, and the tightness and the integrity of the containment vessel are ensured. And during the reactor refueling period, the underwater sealing gate is opened, so that the fuel plant and the reactor plant are smooth, and the work of transporting the fuel assembly underwater is realized. And the underwater sealing gate can be closed according to the requirement, so that the function of isolating the reactor containment vessel through overwater operation is realized.

Chinese patent 201310327244.6 discloses a nuclear fuel transfer device gate valve, including gate valve subassembly and the action bars subassembly that can dismantle the connection, the gate valve subassembly includes the valve plate, the valve rod reaches the valve case that is oblate cavity body structure, the valve plate is the wedge structure, set up on the inner wall of valve case with valve plate assorted wedge groove, valve plate slidable ground inlays to be located in the wedge groove and threaded connection on the valve rod, the valve rod holding is stretched out the valve case outer and is used for being connected with action bars subassembly detachably in the valve case and upper end, drive the valve rod rotation through the action bars subassembly, thereby make the valve plate along the valve rod rise or descend in order to open or to close the transfer passage.

Chinese patent application 201910141718.5 discloses a nuclear safety level fuel transportation passageway gate valve, including setting up at the valve body of lower extreme, the inside flashboard that sets up of valve body, the valve body top sets up the valve gap, valve gap and last valve gap fixed connection, and the valve rod upwards runs through valve gap and last valve gap in proper order from the valve body to stretch out the upper valve gap, the free end and the teletransmission mechanism fixed connection of valve rod, teletransmission mechanism and manual device fixed connection.

At present, in a domestic running nuclear power station, the sealing performance of an underwater sealing gate is poor, the determination of an opening and closing position is inaccurate, the displacement adjusting function of the gate is lacked, the diameter of a hand wheel of an operating mechanism is large, and the operation is inconvenient. Therefore, the underwater sealing gate suitable for the third-generation nuclear power station reactor type needs to be developed.

Disclosure of Invention

The invention aims to provide the nuclear fuel transfer underwater sealing gate which is simple in structure, easy to operate and safe in sealing, aiming at the defects of the prior art.

The technical scheme of the invention is as follows: the utility model provides a nuclear fuel transports underwater sealing gate, includes gate body, gate operating device, drive mechanism, the gate body includes valve body, flashboard, valve rod, and valve body upper portion is equipped with the valve gap, form sealed face between valve body and the flashboard, the flashboard is driven by the valve rod and is sharp elevating movement along sealed face, the valve rod with drive mechanism connects, drive mechanism with gate operating device connects, wherein gate body below is equipped with the gate support, and the gate support is used for supporting gate body and top mechanism thereof, the gate support is including setting up the pressure seat in the resilient means top, press the seat to rotate the adjusting position from top to bottom along the rotation axis, the bottom setting of gate body is in press on the seat.

Further, as above, the nuclear fuel transfer underwater sealing gate, wherein, the resilient means of gate support includes a elevating platform, and the elevating platform outside cover has the dish spring, and the elevating platform lower part is equipped with the guiding axle, and elevating platform upper portion connects set screw, set screw's top with press the bottom of seat to contact, rely on the compression volume of dish spring to carry out the regulation of gate body position.

Further, as above nuclear fuel transports sealing gate under water, wherein, the lower extreme of valve rod with the flashboard passes through T type groove and connects, and the upper portion of valve rod has the transmission screw thread, is connected with valve-stem nut through the transmission screw thread, valve-stem nut is located the top of valve gap, and valve-stem nut connects drive mechanism's transfer line, and the transfer line is at the rotation in-process and is driven the valve rod through the transmission screw thread and rise or descend, and then drive the flashboard and go up and down.

Further, as above nuclear fuel transports sealing gate under water, wherein, drive mechanism's transfer line is the sectional type structure, including main connecting axle and lower connecting axle, is equipped with one section universal joint subassembly that can do position control to the transmission shaft between main connecting axle and the lower connecting axle, lower connecting axle with valve rod nut passes through three-jaw fixed connection, and the lower connecting axle is hollow structure, the valve rod is elevating movement in its inside.

Furthermore, the universal joint component is of a telescopic structure and has the function of absorbing displacement generated by a wall body; the transmission rod is fixed with the wall through the fixing support.

Further, the nuclear fuel transfer underwater sealing gate is characterized in that the gate plate is a wedge-shaped elastic gate plate, and a metal hard sealing structure is arranged between the gate plate and the valve body.

Further, as above nuclear fuel transports underwater sealing gate, wherein, be equipped with the direction muscle inside the valve body, prevent that the flashboard from taking place to rotate at the in-process that goes up and down.

Further, the nuclear fuel transfer underwater sealing gate is characterized in that a metal wound sealing gasket is arranged on a flange surface at the joint of the end surface of the valve body and the nuclear fuel transfer channel; and a metal winding sealing gasket is arranged at the connecting position of the valve body and the valve cover.

Further, as above, the nuclear fuel transfer underwater sealing gate, wherein the gate operating mechanism includes a worm gear case with a hand wheel, the worm gear case is connected with a transmission rod of the transmission mechanism, the hand wheel of the worm gear case is rotated to transmit the torsional force to the bottom valve rod nut through the transmission rod, and then the valve rod and the gate plate are driven to lift through the transmission thread.

Further, the nuclear fuel transfer underwater sealing gate is characterized in that the gate operating mechanism is of a detachable structure, a housing (18) of the gate operating mechanism is bolted with a bearing supporting seat (17), the bearing supporting seat (17) is installed on the ground, and a bearing (24) is installed in the bearing supporting seat and provides axial limit for the whole transmission rod; and a limit switch for displaying the opening and closing position of the gate is arranged on the housing of the gate operating mechanism.

The invention has the following beneficial effects: the invention provides a nuclear fuel transfer underwater sealing gate which is in nuclear specification grade, meets the requirement of earthquake resistance class I and can be remotely operated on water. The gate adopts the rising stem structure of wedge flashboard, and austenite stainless steel material, it is sealed reliable, it is little to open and close the operation moment of torsion, and the structure is simplified, the decontamination maintenance of being convenient for. The gate support with a special structure can absorb the gate displacement in the axial direction and the horizontal direction simultaneously, and can adjust the position of the gate.

Drawings

FIG. 1 is a schematic structural view of a nuclear fuel transfer underwater sealing gate provided by the invention;

FIG. 2 is a schematic structural diagram of a gate body according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a gimbal assembly in an embodiment of the present invention;

FIG. 4 is a schematic structural view of a shutter operating mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a gate support structure according to an embodiment of the present invention.

Detailed Description

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.

The invention provides an underwater sealing gate for nuclear fuel transfer. As shown in fig. 1, the underwater sealing gate mainly comprises a gate body 3, a gate support 4, a gate operating mechanism 1, a transmission mechanism 2 and the like. The lower part of the gate body 3 is provided with a gate support 4 for supporting the gate body 1 and the mechanism above the gate body, and the gate support 4 can elastically adjust the position of the gate body 1 and absorb the gate displacement in the axial direction and the horizontal direction. The gate body 1 comprises a valve body, a gate plate, a valve rod and the like, a sealing surface is formed between the valve body and the gate plate, the gate plate is driven by the valve rod to do linear lifting motion along the sealing surface, the valve rod is connected with the transmission mechanism 2, and the transmission mechanism 2 is connected with the gate operating mechanism 1.

The structure of the gate body in this embodiment is shown in fig. 2, and includes a valve body 5, a gate plate 6, a valve stem 7, a sealing gasket 8, a valve cap 9, a packing 10, a packing pressing sleeve 11, a packing pressing cover 12, a support 13, a valve stem nut 14, a bearing pressing cover 15, a sealing gasket 16, and the like.

The gate plate 6 is of a wedge-shaped elastic gate plate structure, the wedge-shaped gate plate has certain elasticity, and when the gate is closed, the micro-deformation generated by the gate plate is utilized to make up the fit clearance between the gate plate and the valve body due to the processing and manufacturing deviation, so that the sealing capability of the gate is greatly improved.

The gate plate 6 is inserted into a groove matched with the valve body 5, a metal hard sealing structure is adopted on a sealing surface of the valve body and a sealing surface of the gate plate, a hardness difference is formed between the two sealing surfaces, and the sealing performance of the underwater sealing gate is well guaranteed.

The flange surface at the joint of the end surface of the valve body 5 and the nuclear fuel transfer channel is provided with a metal winding sealing gasket 16 to ensure the sealing performance. The upper end of the valve body 5 is connected with the valve cover 9, the connecting position of the valve body 5 and the valve cover 9 and the connecting position of the flange and the valve body are sealed by the metal winding sealing gasket 8, the sealing performance of the valve can be effectively guaranteed, and external media are prevented from entering the inside of the gate.

Be equipped with the direction muscle in valve body 5 inside, flashboard 6 prevents that flashboard 6 from taking place to rotate when opening and closing along the direction muscle inserts in valve body 5, guarantees that sealed face aligns completely. Meanwhile, the flashboard 6 can be ensured not to rub with the valve body base when being closed, and the abrasion of the sealing surface is reduced.

Packing 10 is arranged between the valve cover 9 and the valve rod 7, and a packing pressing sleeve 11 and a packing pressing cover 12 are arranged at the upper part of the packing 10.

The flashboard 6 is driven by the valve rod 7, and is in linear lifting motion along a sealing surface, an exposed rod type structure is adopted, one end of the valve rod 7 is provided with a trapezoidal transmission thread and is connected with a valve rod nut 14 through the transmission thread, and the valve rod 7 is connected with the flashboard 6 through a T-shaped groove. The valve rod nut 14 is arranged at the upper part of the valve cover 9, a bearing gland 15 is arranged outside the valve rod nut 14, and the valve rod nut 14 is connected with a transmission rod of the transmission mechanism. The opening and closing of the shutter 6 is operated by the ascending and descending movement of the valve stem 7.

The valve rod nut 14 is arranged above the valve cover 9, so that the valve rod nut can be prevented from being in direct contact with a medium, and corrosion caused by the influence of the medium is prevented.

The transmission rod of the transmission mechanism 2 is of a sectional structure and comprises a main connecting shaft and a lower connecting shaft, and the lower connecting shaft is fixedly connected with the valve rod nut through three claws. The lower connecting shaft is of a hollow structure, the upper end of the valve rod 7 penetrates into the lower connecting shaft, the valve rod nut is driven to rotate together when the transmission rod rotates, and the valve rod 7 moves up and down in the lower connecting shaft.

A section of the gimbal assembly 32 is mounted between the lower connecting shaft and the main connecting shaft, as shown in FIG. 3. The universal joint assembly 32 can adjust the position of the whole transmission rod, so that the civil engineering can be accurately installed when a certain deviation exists; meanwhile, the universal joint is designed to be of a telescopic structure, and the displacement of the wall body is absorbed when the wall body generates certain displacement. The transmission rod is fixed with the wall through the fixing support.

As shown in fig. 4, the shutter operation mechanism includes a bearing support base 17, a bearing 24, a cover 18, a limit switch 19, a magnet block 20, a bracket 21, a worm gear case 22, and the like. The transmission rod 23 of the transmission mechanism penetrates from the housing 18 to be connected with the worm gear case 22. The hand wheel on the worm gear case 22 is rotated to transmit the torsional force to the valve stem nut at the bottom through the transmission rod, so as to control the lifting of the flashboard.

The gate operating mechanism adopts a worm gear case hand wheel structure, so that the operation is convenient and the moment is small. Meanwhile, a locking device is designed, and when the gate is in a fully closed or fully opened state, the position of the hand wheel is fixed.

A mechanical limit switch 19 is arranged on a housing 18 of the gate operating mechanism, and the opening and closing positions of the gate can be directly observed. And meanwhile, when the gate is in the fully-open position, the limit switch sends a signal. The limit switch 19 comprises a limit groove formed in the housing 18, a limit block is sleeved at the bottom of the upper connecting shaft of the transmission rod 23, and when the gate is opened and closed, the limit block rises and falls along with the thread, and the opening and closing position of the gate can be directly observed through the limit groove. Meanwhile, when the gate is in the fully open position, the open position indicator sends an open signal.

The gate operating mechanism is of a detachable structure, the upper transmission rod is of a sectional structure, adjacent transmission rod sections are bolted through flanges, and the part above the ground can be directly detached when not needed.

The housing 18 is bolted with the bearing support seat 17, and the bearing support seat 17 is installed on the ground and welded with the civil embedded plate. Inside which is mounted a bearing 24 providing axial restraint to the entire drive rod.

As shown in fig. 5, the shutter support is mainly composed of a pressing base 25, a rotating shaft 26, a fixing plate 27, a fixing screw 30, a fixing nut 28, a disc spring 29, a lifting table 31, and the like, and is used for supporting the shutter body, the upper operating mechanism and the auxiliary support transfer passage. The outer portion of the lifting platform 31 is sleeved with the disc spring 29, the lower portion of the lifting platform 31 is provided with a guide shaft, the upper portion of the lifting platform 31 is connected with the fixing screw 30, the top end of the fixing screw 30 is in contact with the bottom of the pressing seat 25, the pressing seat 25 can rotate up and down along the rotating shaft 26 to adjust the position, the fixing plate 27 plays a role in supporting and clamping the rotating shaft 26, and the position of the gate body is adjusted by means of the compression amount of the disc spring 29. The bottom of the gate support is welded with the embedded plate at the bottom of the pool, the bottom of the gate body is placed on the pressing seat, and the support can absorb the gate displacement in the axial direction and the horizontal direction simultaneously through the design of the special gate support.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a nuclear fuel transports underwater sealing gate, includes gate body (3), gate operating device (1), drive mechanism (2), the gate body includes valve body (5), flashboard (6), valve rod (7), and valve body (5) upper portion is equipped with valve gap (9), form sealed face between valve body (5) and flashboard (6), flashboard (6) are driven by valve rod (7) and are sharp elevating movement along sealed face, valve rod (7) with drive mechanism (2) are connected, drive mechanism (2) with gate operating device (1) are connected, its characterized in that, be equipped with gate support (4) below gate body (3), gate support (4) are used for supporting gate body (1) and upper mechanism thereof, gate support (4) are including setting up pressure seat (25) above the resilient means, pressure seat (25) can be followed rotation axis (26) and rotate the adjusting position from top to bottom, the bottom of the gate body (3) is arranged on the pressing seat (25).

2. The underwater sealing gate for nuclear fuel transfer as claimed in claim 1, wherein the elastic means of the gate support (4) comprises a lifting platform (31), a disc spring (29) is sleeved outside the lifting platform (31), a guide shaft is provided at the lower part of the lifting platform (31), a fixing screw (30) is connected to the upper part of the lifting platform (31), the top end of the fixing screw (30) is in contact with the bottom of the pressing base (25), and the position of the gate body is adjusted by the compression amount of the disc spring (29).

3. The underwater sealing gate for nuclear fuel transfer as claimed in claim 1, wherein the lower end of the valve rod (7) is connected with the gate plate (6) through a T-shaped groove, the upper part of the valve rod (7) is provided with a transmission thread and is connected with a valve rod nut (14) through the transmission thread, the valve rod nut (14) is positioned above the valve cover (9), the valve rod nut (14) is connected with a transmission rod of a transmission mechanism, and the transmission rod drives the valve rod (7) to ascend or descend through the transmission thread in the rotating process so as to drive the gate plate (6) to ascend or descend.

4. The underwater sealing gate for nuclear fuel transfer as claimed in claim 3, wherein the driving rod of the driving mechanism (2) is a sectional structure and comprises a main connecting shaft and a lower connecting shaft, a section of universal joint assembly (32) capable of adjusting the position of the driving shaft is arranged between the main connecting shaft and the lower connecting shaft, the lower connecting shaft is fixedly connected with the valve rod nut (14) through three claws, the lower connecting shaft is of a hollow structure, and the valve rod (7) is lifted inside the lower connecting shaft.

5. The nuclear fuel transfer underwater sealing gate of claim 4, wherein the universal joint assembly (32) is of a telescopic structure and has the function of absorbing displacement generated by a wall body; the transmission rod is fixed with the wall through the fixing support.

6. The nuclear fuel transfer underwater sealing gate of claim 1, wherein the gate plate (6) is a wedge-shaped elastic gate plate, and a metal hard sealing structure is arranged between the gate plate (6) and the valve body (5).

7. The underwater sealing gate for nuclear fuel transfer as claimed in claim 1 or 6, wherein a guide rib is provided inside the valve body (5) to prevent the rotation of the gate plate during the lifting process.

8. The nuclear fuel transfer underwater sealing gate of claim 1, wherein a metal-wound sealing gasket (16) is provided on a flange surface where the end surface of the valve body is connected with the nuclear fuel transfer passage; a metal winding sealing gasket (8) is arranged at the connecting position of the valve body (5) and the valve cover (9).

9. The nuclear fuel transfer underwater sealing gate of claim 3, wherein the gate operating mechanism (1) comprises a worm gear box (22) with a hand wheel, the worm gear box (22) is connected with a transmission rod of a transmission mechanism, the hand wheel of the worm gear box is rotated, a torsional force is transmitted to the bottom valve rod nut (14) through the transmission rod, and the valve rod (7) and the gate plate (6) are driven to lift through the transmission thread.

10. The nuclear fuel transfer underwater sealing gate of claim 9, wherein the gate operating mechanism is a detachable structure, the housing (18) of the gate operating mechanism is bolted to the bearing support (17), the bearing support (17) is installed on the ground, and a bearing (24) is installed inside the bearing support to provide axial limit for the whole transmission rod; and a limit switch (19) for displaying the opening and closing position of the gate is arranged on the housing of the gate operating mechanism (1).