Waterwheel chain box type vertical fuel conveying device
阅读说明:本技术 一种水车链箱式燃料垂直输送装置 (Waterwheel chain box type vertical fuel conveying device ) 是由 孟东旺 于 2019-10-23 设计创作,主要内容包括:本发明提供一种水车链箱式燃料垂直输送装置,该装置的机械传动部件置于包容体内,驱动组件置于包容体外,包容体上下端分别与开槽滚道连接。机械传动部件包括驱动轮和从动轮、驱动链、固定于驱动链上的多个用于容纳球形核燃料元件的链箱;驱动轮由驱动组件驱动,并通过驱动链带动从动棘轮转动;各链箱均为具有一开口端的箱体,该箱体内设有用于保证球形核燃料元件位于链箱中心位置的对中导向板,箱体开口端与驱动链相接触的侧壁向外延伸形成用于将球形核燃料元件导流至链箱中或者提供滚动距离使球形核燃料元件进入开槽滚道的导流板;通过固定于包容体内侧壁的纠偏件保证驱动链与传动棘轮之间的啮合。本装置运行可靠,结构简单、经济性高。(The invention provides a waterwheel chain box type fuel vertical conveying device, wherein a mechanical transmission part of the device is arranged in a containing body, a driving assembly is arranged outside the containing body, and the upper end and the lower end of the containing body are respectively connected with a slotted raceway. The mechanical transmission component comprises a driving wheel, a driven wheel, a driving chain and a plurality of chain boxes which are fixed on the driving chain and used for accommodating spherical nuclear fuel elements; the driving wheel is driven by the driving component and drives the driven ratchet wheel to rotate through the driving chain; each chain case is a case body with an opening end, a centering guide plate used for ensuring that the spherical nuclear fuel elements are positioned in the center of the chain case is arranged in the case body, and the side wall of the opening end of the case body, which is in contact with the driving chain, extends outwards to form a guide plate used for guiding the spherical nuclear fuel elements into the chain case or providing a rolling distance to enable the spherical nuclear fuel elements to enter the grooved roller path; the engagement between the driving chain and the transmission ratchet wheel is ensured through the deviation correcting piece fixed on the inner side wall of the containing body. The device has reliable operation, simple structure and high economical efficiency.)
1. A waterwheel chain box type fuel vertical conveying device comprises a sealed containing body (7) containing helium, a mechanical transmission part (5) positioned in the containing body (7), and a driving assembly positioned outside the containing body (7); the upper end and the lower end of the containing body (7) are respectively communicated with the gravity type passive slotted roller paths (11, 2) to form a loop, the bottoms of the slotted roller paths (2, 11) are provided with dust conveying pipes (3) used for collecting dust and debris falling through the slotted roller paths, and the tail ends of the dust conveying pipes are communicated with a dust collecting device (4); it is characterized in that the preparation method is characterized in that,
the mechanical transmission component (5) comprises a driving wheel (101) and a driven wheel (102) which are positioned at the top and the bottom of the containing body (7), a driving chain (9) fixed between the driving wheel (101) and the driven wheel (102), and a plurality of chain boxes (6) which are fixed on the driving chain (9) and are arranged at equal intervals and used for containing spherical nuclear fuel elements (1); the driving wheel (101) is sleeved on the first transmission shaft (16), one end of the transmission shaft (16) is positioned in the containing body (7) and is fixed on the inner side wall of the containing body (7) through a first bearing (19) and a bearing end cover (20), the other end of the transmission shaft (16) is positioned outside the containing body (7) and is connected with the output end of the driving assembly, the driven wheel (102) is sleeved on the second transmission shaft (23), and the two ends of the transmission shaft (23) are fixed on the inner side wall of the containing body (7) through matched bearings and bearing end covers; each chain case (6) has the same structure and is a case body with an opening end, a centering guide plate (25) used for ensuring that the spherical nuclear fuel elements (1) are positioned at the center of the chain case (6) is arranged in the case body, and the side wall of the opening end of the case body, which is contacted with the driving chain (9), extends outwards to form a guide plate (26) used for guiding the spherical nuclear fuel elements (1) into the chain case (6) or providing a rolling distance to enable the spherical nuclear fuel elements (1) to enter the grooved roller path (11); the engagement between the driving chain (9) and the driving wheels (101, 102) is ensured by a deviation correcting piece (8) fixed on the inner side wall of the containing body (7).
2. The vertical fuel transfer arrangement according to claim 1, characterized in that the deviation correcting member (8) is a U-shaped block enveloping the drive chain (9), in one piece or in segments; a plurality of balls (30) with solid lubrication action are uniformly distributed on the inner side wall of the deviation rectifying piece (8) and are in contact with the driving chain (9).
3. The vertical fuel transfer device according to claim 1, characterized in that the surfaces of the centering guide plates (25) and the guide plates (26) in the chain case (6) which contact the spherical nuclear fuel elements (1) are both arc-shaped surfaces with a flow guiding direction.
4. The vertical fuel transfer arrangement according to claim 1, characterized in that the drive chain (9) is an endless chain, a plate chain or a drive belt.
5. The vertical fuel transfer device according to claim 1, wherein the driving wheel (101) and the driven wheel (102) are ratchet wheels or gears.
6. The vertical fuel transfer arrangement of claim 1, wherein the torque provided by the drive assembly to the drive wheel (101) is input by means of permanent magnet or a propeller shaft.
7. The vertical fuel transfer device of claim 1, wherein each of the bearings is an oil-free bearing.
8. The vertical fuel conveying device according to any one of claims 1-7, characterized in that an automatic tensioning member (21) is arranged between the bearing end covers at the two ends of the second transmission shaft (23) and the inner side wall of the containing body (7) for ensuring that the driving chain (9) is always in a tensioned state; the automatic tensioning piece (21) comprises a support frame (211) fixed on the inner side wall of the containing body (7), a plurality of foldable limiting bodies (32) which are axially parallel to the driving chain (9) are fixed on the side wall of the support frame opposite to the bearing end cover of the second transmission shaft (23) and used for preventing the bearing end cover of the second transmission shaft (23) from moving towards the direction which enables the driving chain (9) to tend to be loose, the limiting bodies shielded by the bearing end cover of the second transmission shaft (23) are in a folded state, and the limiting bodies not shielded by the bearing end cover are in an opened state; and a bolt fixedly connected with the bottom of the bearing end cover of the second transmission shaft (23) is arranged at the bottom of the support frame (211), and a limiting spring (33) is sleeved on the bolt.
Technical Field
The invention relates to a waterwheel chain box type fuel vertical conveying device, which is used for a spherical nuclear fuel element loading and unloading circulation system, a spent fuel unloading system and a new fuel injection system of a high-temperature gas cooled reactor nuclear power station or similar application fields of petrifaction, electric power and the like, and belongs to the technical field of transmission.
Background
The loading and unloading circulation of the spherical nuclear fuel element of the high-temperature gas cooled reactor nuclear power station needs to rely on a helium compressor to provide a pneumatic transmission power source required by the lifting of the spherical nuclear fuel element, under the normal working condition, the spherical nuclear fuel element carries out reactor core main circulation, spent fuel discharging and new fuel injection through helium pneumatic transmission, and in the pneumatic circulation transmission process, the spherical nuclear fuel element continuously rubs and collides with the inner wall of a pipeline and equipment such as a discharging device, a ball crushing separation device, a fuel consumption measurement device, a bridge connector and the like.
At present, the device for realizing the loading, unloading, circulating and conveying of spherical nuclear fuel elements by the pneumatic conveying power source mainly has the following defects:
the method has the following disadvantages: the spherical nuclear fuel element loading and unloading circulation adopts helium pneumatic transmission. Under normal working conditions, the spherical nuclear fuel element needs to rely on a helium compressor to provide a pneumatic transmission power source required for lifting in the pneumatic circulating transmission process, and the insufficient reliability of the helium compressor causes the spherical nuclear fuel element to lose the power source in a circulating way, so that the reactor is passively stopped; meanwhile, in the process of pneumatic circulating transmission, the requirements on the inner diameter of a pneumatic transmission pipeline and the protrusion and the depression of the inner wall of the welding seam of the pipeline are high, the spherical nuclear fuel element continuously rubs and collides with the pipeline wall, and the generated fuel dust and scraps often cause the blockage accident of the spherical nuclear fuel element, so that the spherical nuclear fuel element cannot be transmitted and circulated to cause the passive shutdown of a reactor; the quantity of spherical nuclear fuel elements and the size deviation of fuel balls in the pneumatic conveying pipeline have different requirements on pneumatic conveying pressure parameters, so that the detention and the oscillation of the spherical nuclear fuel elements in the pipeline are aggravated, the blockage of the spherical nuclear fuel elements is caused, and the system is unstable in operation.
The second disadvantage is that: under the working condition of blockage accidents of the spherical nuclear fuel element, in high-temperature, high-pressure and high-radioactivity environments and complex pipeline environments, the blockage points of the spherical nuclear fuel element are found to be difficult to check, part of blockage point maintenance personnel and maintenance tools cannot reach, and the blockage accidents of the spherical nuclear fuel element are eliminated, so that radioactivity leakage is easily caused.
In order to overcome the disadvantages of the above-mentioned conveying device, the applicant has proposed an escalator-type fuel conveying device (application No. 201910471958.1), which uses a multi-stage escalator-type fuel conveying device to engage with a grooved raceway to realize the loading and unloading cycle of spherical nuclear fuel elements, spent fuel discharge and new spherical nuclear fuel element injection according to the requirements of the radiation zone and the fire zone of a nuclear power plant, wherein the mechanical transmission part comprises a transmission ratchet wheel, a driving chain fixed on the transmission ratchet wheel, and a plurality of steps fixed on the driving chain. However, in the engineering implementation process, the escalator type fuel transmission device needs to keep a certain included angle (generally less than 45 degrees) with the horizontal plane, and needs to occupy larger building area and space, so that the building cost is high; the spherical nuclear fuel element adopts a multi-section escalator type fuel transmission device and a slotted roller path to realize continuous transmission, and the equipment has high manufacturing and installation precision and high cost; the escalator-type fuel conveying device is complex in equipment and has certain difficulty in maintenance.
Disclosure of Invention
In order to solve the various problems, the invention provides the waterwheel chain box type fuel vertical conveying device which is simple in structure, unlimited in vertical lifting height, wider in application range, better in economical efficiency and higher in reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a waterwheel chain-box type fuel vertical conveying device comprises a sealed containing body containing helium, a mechanical transmission part positioned in the containing body and a driving assembly positioned outside the containing body; the upper end and the lower end of the containing body are respectively communicated with the gravity type passive slotted roller path to form a loop, the bottom of the slotted roller path is provided with a dust conveying pipe for collecting dust and scraps falling through the slotted roller path, and the tail end of the dust conveying pipe is communicated with a dust collecting device; it is characterized in that the preparation method is characterized in that,
the mechanical transmission component comprises a driving wheel and a driven wheel which are positioned at the top and the bottom of the containing body, a driving chain fixed between the driving wheel and the driven wheel, and a plurality of chain boxes which are fixed on the driving chain and are arranged at equal intervals and used for containing spherical nuclear fuel elements; the driving wheel is sleeved on the first transmission shaft, one end of the transmission shaft is positioned in the containing body and is fixed on the inner side wall of the containing body through a first bearing and a bearing end cover, the other end of the transmission shaft is positioned outside the containing body and is connected with the output end of the driving assembly, the driven wheel is sleeved on the second transmission shaft, and two ends of the transmission shaft are fixed on the inner side wall of the containing body through a matched bearing and a bearing end cover; each chain case has the same structure and is a case body with an opening end, a centering guide plate used for ensuring that the spherical nuclear fuel element is positioned at the center of the chain case is arranged in the case body, and the side wall of the opening end of the case body, which is contacted with the driving chain, extends outwards to form a guide plate used for guiding the spherical nuclear fuel element into the chain case or providing a rolling distance to enable the spherical nuclear fuel element to enter the grooved raceway; the engagement between the driving chain and the driving wheel is ensured through the deviation rectifying part fixed on the inner side wall of the containing body.
Furthermore, the deviation correcting piece is a U-shaped block body which forms an envelope for the driving chain, and is integrated or segmented; and a plurality of balls with solid lubrication action are uniformly distributed on the inner side wall of the deviation rectifying part and are in contact with the driving chain.
Furthermore, the surfaces of the centering guide plate and the guide plate in the chain case, which are contacted with the spherical nuclear fuel element, are arc surfaces with a flow guide direction.
Furthermore, an automatic tensioning piece (21) is arranged between the bearing end covers at the two ends of the second transmission shaft and the inner side wall of the containing body and used for ensuring that the driving chain is always in a tensioning state; the automatic tensioning piece comprises a support frame fixed on the inner side wall of the containing body, a plurality of foldable limiting bodies axially parallel to the driving chain are fixed on the side wall of the support frame opposite to the bearing end cover of the second transmission shaft and used for preventing the bearing end cover of the second transmission shaft from moving towards the direction which enables the driving chain to tend to loose, the limiting bodies shielded by the bearing end cover of the second transmission shaft are in a folded state, and the limiting bodies not shielded by the bearing end cover are in an opened state; and a bolt fixedly connected with the bottom of the bearing end cover of the second transmission shaft is arranged at the bottom of the support frame, and a limiting spring is sleeved on the bolt.
The invention has the characteristics and beneficial effects that:
the driving principle of the waterwheel chain box type fuel vertical conveying device provided by the invention is similar to that of an ancient agricultural irrigation tool-waterwheel in China. The mechanical transmission part of the conveying device is arranged in helium atmosphere of a high-temperature, high-pressure and high-radioactivity containing body, and the driving motor and the permanent magnet coupler are arranged outside the containing body. The moment of torsion of driving motor passes through permanent magnet coupling input and gives the transmission ratchet and drive the driving chain circulation transmission, and the drive wheel is fixed at the inclusion body inner wall through oil-free lubrication bearing and bearing housing, and the moment of torsion of drive wheel relies on permanent magnet input, avoids moment of torsion input to cause the inclusion body trompil, prevents that a return circuit helium from revealing and radioactive escape. The ball inlet end and the ball outlet end of the fuel vertical conveying device are connected with the slotted roller path, and fuel dust and debris flow into the dust collecting device through the slotted roller path. The centering guide plate in the chain case of the waterwheel chain case type fuel vertical conveying device ensures that the spherical fuel element is in the center position of the chain case, and prevents the chain case from being deviated from the center to cause the deviation of a driving chain. The guide plate on the chain box can prevent the spherical fuel element from being clamped between the driving chains and preventing the spherical fuel element from being collided with the driving chains, so that the driving chains are prevented from being deviated due to the impact force of the spherical fuel element on the driving chains, and the spherical fuel element is prevented from being damaged due to fragments generated by collision. After the fuel vertical conveying device discharges the spherical fuel elements, the spherical fuel elements are continuously conveyed through the gravity type slotted roller path, so that the circular conveying, injection and discharge of the spherical fuel elements are realized. The driving chain of the fuel vertical conveying device realizes the reliable transmission of the driving force of the driving chain and the ratchet wheel through the deviation rectifying part, the driving chain is ensured not to deviate, and the theoretical lifting height is not limited. The automatic tensioning piece can realize the fastening of the driving chain when the driving chain is loosened, and the stable transmission of the torque of the driving wheel and the driving chain is ensured.
In summary, compared with a pneumatic conveying device and an automatic escalator type fuel conveying device, the vertical conveying device for water wheel chain box type fuel has the advantages of small occupied area, no fault point, reliable operation, simple system equipment and pipeline arrangement, flexible and convenient combination with other functional equipment (a discharging device, a ball breaking separating device, a fuel consumption measuring device and a feeding device) and high economical efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a waterwheel chain box type vertical fuel conveying device according to an embodiment of the present invention.
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1.
Fig. 3(a) to (c) are a front view, a left side view and a top view, respectively, of the chain case structure shown in fig. 1.
FIGS. 4(a) - (d) are front, top, left and C-C sectional views, respectively, of the corrector structure shown in FIG. 1.
Fig. 5 is an enlarged view of a portion of the tension member shown in fig. 1 connected to the bearing block, the second drive shaft, and the bearing.
Fig. 6(a) - (c) are front, left and top views, respectively, of the tension member structure shown in fig. 5.
Fig. 7 is a schematic structural view of the grooved raceway and the slits thereon shown in fig. 1.
FIG. 8 is a diagram illustrating an application of the apparatus shown in FIG. 1 in a high temperature gas cooled reactor nuclear power plant.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, a schematic diagram of an overall structure of a waterwheel chain box type vertical fuel conveying device according to an embodiment of the present invention is shown, and the waterwheel chain box type vertical fuel conveying device is used in a high temperature gas cooled reactor nuclear power plant. The fuel vertical conveying device of the embodiment comprises a sealed containing body 7 containing helium, a mechanical transmission part 5 positioned in the containing body 7 and a driving component positioned outside the containing body 7; the upper end and the lower end of the containing body 7 are respectively communicated with the gravity type passive slotted
The specific implementation modes and functions of the components in this embodiment are as follows:
the containing body 7 is made of materials for containing high temperature, high pressure and high radioactivity, and comprises ceramic, carbon fiber, steel or other composite materials, and helium atmosphere is contained in the containing body. The lower part and the upper part of the containing body 7 are respectively provided with a ball inlet end and a ball outlet end which are communicated with the gravity type passive
Referring to fig. 2, mechanical transmission members 5 are used to realize the circulation transfer of the spherical
Referring to fig. 3, the chain cases 6 spaced apart from each other on the driving chain 9 are used to accommodate spherical
Referring to fig. 4(a) - (d), the
Referring to fig. 5 and 6(a) to (c), in the operating state of the present conveyor, the drive chain 9 may be loosened due to wear. In order to avoid the drive chain 9 from being in a loose state and ensure the stable transmission of the torque between the driving wheel and the drive chain 9, the fuel vertical conveying device comprises an
Referring to fig. 7, slits are opened at the bottom of each grooved roller path, taking the grooved
In practical application, the waterwheel chain box type fuel vertical conveying device can be flexibly combined with existing nuclear power plant equipment such as a nuclear fuel unloading device, a ball crushing separation device, a fuel consumption measuring device, a feeding device and the like, the loading and unloading circulation function of the spherical nuclear fuel element of the nuclear power plant nuclear reactor is realized, the transmission efficiency is high, the reliability is high, and an application example is shown in fig. 8.
In the embodiment of the present application,
the nuclear
The transfer process of the spherical
after being discharged from a nuclear
Transport process of spherical
when the spherical
The above examples are only for illustrating the present invention and are not to be construed as limiting the present invention. According to the technical principle of the invention, the design scheme of the waterwheel chain box type fuel vertical conveying device can be designed in various modifications by ordinary technicians. The scope of the invention is defined by the following claims.
- 上一篇:一种医用注射器针头装配设备
- 下一篇:一种车载移动式换料系统及换料方法