CN111916228A

CN111916228A - Drive rod group on control rod drive mechanism and offshore reactor

Info

Publication number: CN111916228A
Application number: CN202010761177.9A
Authority: CN
Inventors: 唐宝强; 周军城; 周梓丞; 骆青松; 李辉
Original assignee: Wuhan No 2 Ship Design Institute No 719 Research Institute of China Shipbuilding Industry Corp
Current assignee: Wuhan No 2 Ship Design Institute No 719 Research Institute of China Shipbuilding Industry Corp
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2020-11-10
Anticipated expiration: 2040-07-31
Also published as: CN111916228B

Abstract

The application discloses last drive rod group of control rod drive mechanism and marine reactor relates to marine nuclear power equipment's technical field, and the drive rod group includes: the driving rod is provided with a flange on the peripheral side, and the flange divides the driving rod into a first part and a second part; the elastic component is sleeved on the first part along the axial direction of the driving rod and is abutted against the flange; a stem cap that fits over the resilient member and the flange, with the flange and resilient member confined within the stem cap; meanwhile, when the driving rod moves upward, the flange presses the elastic member to place the elastic member in a compressed state. This application can be integrated on the actuating lever with the ability of falling the stick fast, need not other independent energy storage component with higher speed and can enough realize the quick stick that falls of control stick subassembly, realizes scram.

Description

Drive rod group on control rod drive mechanism and offshore reactor

Technical Field

The application relates to the technical field of marine nuclear power equipment, in particular to a driving rod group on a control rod driving mechanism and an offshore reactor.

Background

The driving rod is an important component of the control rod driving mechanism, and the main function of the driving rod is to drive the control rod assembly to move up and down in the reactor core. In the operation process of the reactor, a control rod driving part in the control rod driving mechanism is meshed with a tooth socket (or a thread) on a driving rod, so that the driving rod moves up and down under the action force of the control rod driving part, wherein the lower end of the driving rod is connected with a control rod assembly, and therefore the driving rod drives the control rod assembly to move up and down in the reactor core, and the aim of controlling the reactivity is fulfilled.

The existing marine reactor control rod drive mechanism is different from the land control rod drive mechanism in that a marine vessel may have a pitching and swinging state, and a reactor is required to be stopped urgently, so that the rod dropping time is required to be as short as possible, and the nuclear safety is improved.

In the related technology, most of the marine reactor control rod driving mechanisms are designed by independently adding an acceleration energy storage component on the basis of the land control rod driving mechanism to provide rod dropping driving force except gravity for a control rod assembly so as to meet the rod dropping requirement of emergency shutdown.

However, the separate acceleration energy storage component not only increases the structural complexity of the control rod drive mechanism, but also requires separate disassembly and assembly during the loading and unloading of the reactor. Obviously, the independent arrangement of the acceleration energy storage component not only puts higher requirements on the reliability of the control rod driving mechanism, but also obviously increases the loading and unloading operation time of the reactor and reduces the economy of the marine reactor.

Disclosure of Invention

The embodiment of the application provides a last actuating rod group of control rod drive mechanism and marine reactor, with the ability integration of the stick that falls fast on the actuating rod, need not other independent energy storage component with higher speed and can enough realize the fast stick that falls of control stick subassembly, realize emergency shutdown.

In one aspect, embodiments of the present application provide a drive rod assembly for a control rod drive mechanism, the drive rod assembly comprising:

the driving rod is provided with a flange on the peripheral side, and the flange divides the driving rod into a first part and a second part;

the elastic component is sleeved on the first part along the axial direction of the driving rod and is abutted against the flange;

a stem cap that fits over the resilient member and the flange, with the flange and resilient member confined within the stem cap; at the same time, the user can select the desired position,

when the driving rod moves upwards, the flange presses the elastic component, so that the elastic component is in a compressed state.

In this embodiment, preferably, the flange is provided with at least one passage communicating the inside and the outside of the rod cap.

Preferably, the channel is a notch in which the outer periphery of the flange is recessed inwardly.

Preferably, the number of channels is plural, all of the annular arrays of channels being distributed on the flange.

Preferably, the upper end of the rod cap is provided with a first blocking part, and the first blocking part is sleeved on the first part and is in clearance fit with the first part.

Preferably, the lower end of the rod cap is provided with a second blocking portion, the second blocking portion is sleeved outside the second portion and has a gap with the second blocking portion, and the second blocking portion is used for being abutted to the flange.

Preferably, the flange is a clearance fit with the wand cap.

Preferably, the elastic member is a spring.

Preferably, the peripheral side of the second portion is provided with splines for fitting with control rod drive components in a control rod drive mechanism.

In another aspect, embodiments of the present application further provide an offshore reactor, including:

a control rod assembly;

a control rod drive mechanism comprising:

-a control rod drive component;

-a drive rod assembly as described above, the free end of the second section being fixedly connected to the control rod assembly and the peripheral side of the second section being adapted to connect to the control rod drive member; at the same time, the user can select the desired position,

the control rod drive member drives the drive rod upward, the flange compresses the resilient member to place the resilient member in compression, and the drive rod moves rapidly downward when the control rod drive member disengages the second portion.

The beneficial effect that technical scheme that this application provided brought includes:

(1) the embodiment of the application provides a driving rod group on a control rod driving mechanism, which can quickly drop rods and emergently stop when a marine vessel is in a tilting and swinging state; the ability integration that the stick falls fast is on the actuating lever in this application embodiment, and the structural constraint of uncontrolled stick driver part also need not other independent energy storage component with higher speed, simplifies control rod drive mechanism's in the marine reactor structure, effectively shortens the loading and unloading time of reactor.

(2) In this embodiment, set up the passageway of intercommunication first portion and second part on the flange of actuating lever, guarantee that the reactor coolant liquid in the pole cap can unobstructed the outflow when elastomeric element compresses, reduce the promotion load that water pressure leads to, balanced inside and outside water pressure.

(3) In the embodiment, the tooth grooves of the second part in the driving rod are matched with the meshing part of the control rod driving part, the control rod driving part drives the second part to move, and the tooth groove structure is designed according to actual requirements, so that the requirements of different marine reactor control rod driving part meshing modes can be met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a front view of a drive rod group on a crdm provided by an embodiment of the present application;

FIG. 2 is a front elevational, full cross-sectional view of a drive rod group in a crdm provided in accordance with an embodiment of the present application;

FIG. 3 is a view from the direction A-A in FIG. 2;

FIG. 4 is a schematic view of the driving rod assembly accommodated in the pressure-resistant casing according to the embodiment of the present application;

FIG. 5 is a schematic view of the driving rod assembly contacting the step portion of the step hole of the pressure casing according to the embodiment of the present application;

in the figure: 1. a drive rod; 11. a flange; 12. a first portion; 13. a second portion; 131. a tooth socket; 132. connecting holes; 14. a channel; 2. an elastic member; 3. a rod cap; 31. a first stopper portion; 32. a second stopper portion; 4. a pressure-resistant housing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 to 3, an embodiment of the present application provides a drive rod assembly for a control rod drive mechanism, the drive rod assembly including:

the driving rod 1 is provided with a flange 11 on the peripheral side, and the flange 11 divides the driving rod 1 into a first part 12 and a second part 13;

an elastic member 2 that is fitted to the first portion 12 in the axial direction of the drive lever 1 and abuts against the flange 11;

a rod cap 3, which is sleeved outside the elastic component 2 and the flange 11, and the flange 11 and the elastic component 2 are limited in the rod cap 3; at the same time, the user can select the desired position,

when the driving rod 1 moves upward, the flange 11 presses the elastic member 2 to put the elastic member 2 in a compressed state.

The working principle of the drive rod group on the control rod drive mechanism is as follows:

providing the above-mentioned driving rod group, keeping the position of the rod cap 3 unchanged, moving the driving rod 1 upwards, the flange 11 abuts against the elastic component 2 and overstocks the elastic component 2, and when the external force applied to the driving rod 1 is removed, the driving rod 1 rebounds downwards rapidly under the action of gravity and the elastic force provided by the elastic component 2.

Further, the flange 11 is provided with at least one channel 14 communicating the inside and the outside of the rod cap 3. A channel 14 for communicating the first part 12 with the second part 13 is formed in the flange 11 of the driving rod, so that reactor cooling liquid in the rod cap 3 can smoothly flow out when the elastic part 2 is compressed, the lifting load caused by water pressure is reduced, and the internal and external water pressures are balanced.

Further, the passage 14 is a notch in which the outer periphery of the flange 11 is recessed inward. When the notch is located on the outer peripheral side of the flange 11, a notch having a larger diameter can be provided, and the notch can be easily manufactured. Compared with the circular through holes arranged on the flange 11, the circular through holes are easy to machine, more solid bodies of the flange 11 can be reserved, the compressive strength of the flange 11 is improved, and a wider reactor coolant channel is provided.

In particular, the number of channels 14 is multiple, all the channels 14 being distributed in an annular array on the flange 11. The annular array distribution can enable the flange 11 to be evenly stressed.

Preferably, the upper end of the rod cap 3 is provided with a first stop portion 31, and the first stop portion 31 is sleeved on the first portion 12 and is in clearance fit with the first portion 12. The first portion 12 is a cylinder, the outer diameter of the first portion is the same as the inner diameter of the first stop portion 31, and the dimensional tolerance fit is a clearance fit, so that the first stop portion 31 can also guide the first portion 12 when abutting against the elastic member 2.

Further, a second blocking portion 32 is disposed at a lower end of the rod cap 3, the second blocking portion 32 is sleeved outside the second portion 13, a gap is formed between the second blocking portion 32 and the second blocking portion 32, and the second blocking portion 32 is used for abutting against the flange 11. The inner diameter of the second stopper 32 is smaller than the outer diameter of the flange 11, so that the flange 11 can be restricted inside the rod cap 3, and a gap is formed between the inner wall of the second stopper 32 and the outer wall of the second portion 13, so that the reactor coolant in the inner cavity of the rod cap 3 can flow out from the top to the bottom through the gap.

In particular, the flange 11 is clearance-fitted with the stem cap 3. The outer diameter of the flange 11 is the same as the inner diameter of the rod cap 3, and the dimensional tolerance fit is clearance fit, so that the flange 11 can move up and down in the rod cap 3 in sequence, and the rod cap 3 plays a role in guiding the movement of the flange 11.

In particular, the elastic member 2 is a spring. The spring is sleeved on the first part 12, and the first part 12 is used as a supporting part and can also prevent the spring from being compressed and deflected. Meanwhile, when the flange 11 abuts against the second stopping portion 32, the spring is at the original length.

Specifically, the second portion 13 is provided with splines 131 on the circumferential side thereof for mating with control rod drive components in the crdm. The tooth grooves 131 are engaged with the driving part of the control rod driving part, and it can be seen that when the control rod driving part is engaged with the tooth grooves 131, the tooth grooves 131 can be controlled to drive the driving rod 1 to move up and down.

And the tooth space of the second part in the driving rod is adapted to the meshing part of the control rod driving part, the control rod driving part drives the second part to move, and the tooth space structure is designed according to actual requirements, so that the requirements of different marine reactor control rod driving part meshing modes can be met.

As shown in fig. 4 to 5, embodiments of the present application further provide an offshore reactor, which includes a control rod assembly and a control rod drive mechanism, wherein the control rod drive mechanism includes:

-a control rod drive component;

the free end of the second section 13 is fixedly connected to the control rod assembly, and the peripheral side of the second section 13 is adapted to be connected to the control rod drive block, as in the drive rod set described above; at the same time, the user can select the desired position,

the control rod drive assembly drives the drive rod 1 upward, the flange 11 compresses the resilient member 2 to place the resilient member 2 in compression, and the drive rod 1 moves rapidly downward when the control rod drive assembly disengages the second portion 13.

The embodiment of the application provides an offshore reactor, its theory of operation is:

and assembling a drive rod group, accommodating a rod cap 3 in a pressure shell 4 with a stepped hole of the control rod drive mechanism, fixedly mounting a control rod assembly at the bottom of a second part 13 in the drive rod 1, connecting a control rod drive part in the control rod drive mechanism with the second part 13, and driving the second part 13 to move upwards or downwards by the control rod drive part. When the reactor is operated at a power-up state, the control rod driving component drives the second part 13 to move upwards to drive the elastic component 2 and the rod cap 3 to move upwards, when the rod cap 3 moves upwards to contact with a step part of a stepped hole of the pressure shell, the rod cap 3 is limited to move upwards continuously, at the moment, the second part 13 is driven by the control rod driving mechanism to move upwards continuously, the elastic component 2 arranged between the rod cap 3 and the flange 11 is compressed to store elastic potential energy, when the reactor needs to perform emergency shutdown, the control rod driving component is separated from the second part 13, and the flange 11 in the driving rod 1 is accelerated to fall back towards the reactor core under the action of the elastic force of the elastic component 2; further, when the elastic member 2 is restored to the original state, the flange 11 is confined in the rod cap 3, and therefore, the rod cap 3 is also dropped toward the core along with the driving rod 1.

The bottom of the second portion 13 is provided with a connecting hole 132, and the connecting hole 132 is a threaded hole to facilitate connection with the control rod assembly.

The driving rod group in the offshore reactor according to the embodiment of the present application has been described in detail in the above-mentioned driving rod group embodiment, and is not described in detail herein.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drive rod cluster on a control rod drive mechanism, the drive rod cluster comprising:

the driving rod (1) is provided with a flange (11) on the peripheral side, and the flange (11) divides the driving rod (1) into a first part (12) and a second part (13);

an elastic member (2) that is fitted to the first portion (12) in the axial direction of the drive lever (1) and abuts against the flange (11);

a rod cap (3) which is sleeved outside the elastic part (2) and the flange (11), and the flange (11) and the elastic part (2) are limited in the rod cap (3); at the same time, the user can select the desired position,

when the driving rod (1) moves upwards, the flange (11) presses the elastic component (2) so that the elastic component (2) is in a compressed state.

2. The drive rod cluster in a crdm as set forth in claim 1, wherein the flange (11) is provided with at least one passage (14) communicating the inside and outside of the rod cap (3).

3. The drive rod cluster in a crdm as set forth in claim 2, wherein the channel (14) is a notch recessed inward from the outer periphery of the flange (11).

4. The drive rod cluster in a crdm as set forth in claim 2, wherein the number of the channels (14) is plural, and all of the channels (14) are distributed in an annular array on the flange (11).

5. The drive rod group in a crdm as set forth in claim 1, wherein the rod cap (3) has a first stopper (31) at the upper end thereof, and the first stopper (31) is fitted over the first portion (12) and is in clearance fit with the first portion (12).

6. The drive rod assembly for a control rod drive mechanism as set forth in claim 1, wherein the rod cap (3) has a second stopper portion (32) at a lower end thereof, the second stopper portion (32) is fitted over the second portion (13) with a gap from the second stopper portion (32), and the second stopper portion (32) is adapted to abut against the flange (11).

7. The drive rod cluster on a crdm as set forth in claim 1, characterized in that the flange (11) is clearance-fitted with the rod cap (3).

8. The drive rod cluster in a crdm as set forth in claim 1, wherein the resilient member (2) is a spring.

9. The drive rod cluster in a crdm as set forth in claim 1, wherein the second section (13) is provided with splines (131) on the periphery for mating with crdm control rod drive components.

10. An offshore reactor, characterized in that it comprises:

a control rod assembly;

a control rod drive mechanism comprising:

-a control rod drive component;

-the drive rod assembly as set forth in any of claims 1 to 9, the free end of the second portion (13) being affixed to the control rod assembly and the peripheral side of the second portion (13) being adapted for connection to the control rod drive means; at the same time, the user can select the desired position,

the control rod drive part drives the drive rod (1) to move upwards, the flange (11) presses the elastic part (2) so that the elastic part (2) is in a compressed state, and when the control rod drive part is separated from the second part (13), the drive rod (1) moves downwards rapidly.