阅读说明：本技术 浮动阀门装置及其工作方法、压力容器 (Floating valve device, working method thereof and pressure container ) 是由 胡伦宝 曹学冰 翟立宏 黄天荣 钟金童 周建明 路广遥 卢朝晖 刘强 于 2020-03-30 设计创作，主要内容包括：本发明公开了一种浮动阀门装置及其工作方法、压力容器,浮动阀门装置包括导流管、浮动阀门以及驱动组件；导流管竖直设置在压力容器内隔板上并与隔板孔相连通；导流管的管壁上设有导流孔,连通导流管的内部流道和压力容器的上部环腔；浮动阀门设置在导流管和隔板孔之间并连通导流管和隔板孔,浮动阀门可在冷却剂的浮力或重力作用下沿导流管的轴向上下滑动,闭合或打开隔板孔,将压力容器的上部环腔和下部环腔隔断或连通；驱动组件设置在导流管内,驱使上部环腔的冷却剂进入导流管并通过浮动阀门流入下部环腔。本发明实现核反应堆冷却剂在正常运行流道和事故工况流道进行切换,解决了高温和强辐照环境下难以采用能动装置和阀门动力输入难题。(The invention discloses a floating valve device and a working method thereof as well as a pressure container, wherein the floating valve device comprises a flow guide pipe, a floating valve and a driving assembly; the guide pipe is vertically arranged on the inner partition plate of the pressure vessel and communicated with the partition plate hole; the pipe wall of the flow guide pipe is provided with flow guide holes which are communicated with an internal flow passage of the flow guide pipe and an upper annular cavity of the pressure container; the floating valve is arranged between the flow guide pipe and the partition plate hole and communicated with the flow guide pipe and the partition plate hole, can slide up and down along the axial direction of the flow guide pipe under the action of buoyancy or gravity of coolant, closes or opens the partition plate hole, and partitions or communicates an upper annular cavity and a lower annular cavity of the pressure vessel; the driving assembly is arranged in the flow guide pipe and drives the coolant in the upper annular cavity to enter the flow guide pipe and flow into the lower annular cavity through the floating valve. The invention realizes the switching of the nuclear reactor coolant between the normal operation flow channel and the accident condition flow channel, and solves the difficult problem that the power input of an active device and a valve is difficult to adopt under the high-temperature and strong irradiation environment.)

1. A floating valve device is arranged on a partition plate in a pressure container and is characterized by comprising a flow guide pipe, a floating valve and a driving assembly;

the guide pipe is vertically arranged on the partition plate and communicated with the partition plate hole on the partition plate; the pipe wall of the flow guide pipe is provided with at least one flow guide hole which is communicated with an internal flow passage of the flow guide pipe and an upper annular cavity of the pressure container;

the floating valve is arranged between the draft tube and the partition plate hole and communicated with the draft tube and the partition plate hole, can slide up and down along the axial direction of the draft tube under the action of buoyancy or gravity of coolant, is closed on the partition plate hole or is opened to partition or communicate the upper annular cavity and the lower annular cavity of the pressure vessel;

the driving assembly is arranged in the flow guide pipe and drives the coolant in the upper annular cavity to enter the flow guide pipe and flow into the lower annular cavity through the floating valve.

2. The floating valve apparatus of claim 1, wherein the floating valve comprises a valve body fitted at the lower port of the draft tube, an annular baffle attached to an outer periphery of one end of the valve body and located outside the lower port;

the valve body is provided with a circulation channel which runs through the two opposite ends of the valve body, and the circulation channel is communicated with the inner flow passage of the flow guide pipe and the partition plate hole;

an annular through hole is formed between the periphery of the valve body and the inner wall of the partition plate hole, and the baffle plate slides up and down along the axial direction of the flow guide pipe along with the valve body and is closed on the annular through hole or separated from the annular through hole.

3. The floating valve device of claim 2, wherein the valve body is embedded in the lower port of the flow guide pipe or sleeved outside the port.

4. The floating valve device of claim 2, wherein the baffle plate is provided with a protrusion protruding towards the partition plate, and the partition plate around the partition plate hole is provided with a clamping groove matched with the protrusion; when the baffle plate closes the annular through hole, the protruding part is clamped in the clamping groove.

5. A floating valve arrangement according to claim 2 wherein the width of the baffle plate is greater than the width of the annular through bore.

6. The floating valve assembly of claim 1 wherein the drive assembly includes a drive shaft extending axially of the draft tube, an impeller connected to a lower end of the drive shaft; the upper end of the drive shaft extends to the upper end of the pressure vessel.

7. The floating valve apparatus of claim 6, wherein the impeller is located below the guide hole in an axial direction of the guide pipe.

8. The floating valve arrangement of claim 6 further comprising a motor coupled to the drive shaft; the motor is arranged outside the pressure container.

9. A floating valve arrangement according to any of claims 1-8, wherein the floating valve arrangement further comprises a support; the support member is located at the periphery of the partition hole and is connected between the lower end of the draft tube and the partition.

10. The floating valve apparatus of claim 9 wherein the support comprises at least one support bar; or the support member is a support wall which is connected between the peripheral surface of the lower end of the flow guide pipe and the partition plate in a surrounding manner, and the support wall is provided with at least one through hole which is communicated with the partition plate hole and the upper annular cavity.

11. A method of operating a floating valve assembly according to any one of claims 1 to 10, comprising:

under the normal operation working condition, under the driving of the driving assembly, the coolant in the upper annular cavity in the pressure vessel enters the flow guide pipe, flows into the lower annular cavity through the floating valve, and then enters the hanging basket from the bottom of the hanging basket in the pressure vessel to cool the reactor core in the hanging basket; the coolant heated after passing through the reactor core enters the upper annular cavity through an outlet on the hanging basket;

under the condition of an accident, the floating valve slides upwards along the axial direction of the flow guide pipe under the buoyancy action of the coolant, the partition plate hole is opened, the coolant in the upper annular cavity in the pressure container flows into the lower annular cavity through the partition plate hole, and then enters the hanging basket from the bottom of the hanging basket in the pressure container to cool the reactor core in the hanging basket; the coolant heated after passing through the reactor core enters the upper annular cavity through an outlet on the hanging basket.

12. A pressure vessel comprising a vessel body, a basket provided in the vessel body, a partition provided at a lower end in the vessel body and connected between an outer peripheral side surface of the basket and an inner wall surface of the vessel body, at least one floating valve device according to any one of claims 1 to 10 provided on the partition.

Technical Field

The invention relates to a valve device, in particular to a floating valve device, a working method thereof and a pressure container.

Background

Under normal operating conditions, coolant in the nuclear reactor flows into an annular cavity below a partition plate in the pressure vessel mainly through holes in the partition plate and then enters a reactor core in a hanging basket. At present, the coolant hole of the clapboard is mainly opened and closed through a set one-way door. Under normal operating conditions, the one-way door needs to move upwards through the buoyancy of the coolant below to close the through hole in the partition plate, and under accident conditions, the one-way door needs to open the coolant hole through the mass difference between the one-way door and the coolant. However, the flow field around the one-way gate has a plurality of irregular directions, so that the one-way gate is unstable to open and close.

In addition, to the setting of above-mentioned check door, need set up the baffle into double-deck baffle structure, reach the purpose of pressure boost, need set up the water conservancy diversion structure simultaneously, reach the purpose in stable flow field, it is comparatively complicated.

Disclosure of Invention

The invention aims to provide a floating valve device for realizing the switching of a coolant flow passage of a nuclear reactor, an operating method thereof and a pressure vessel with the floating valve device.

The technical scheme adopted by the invention for solving the technical problems is as follows: the floating valve device is arranged on a partition plate in a pressure container and comprises a flow guide pipe, a floating valve and a driving assembly;

the guide pipe is vertically arranged on the partition plate and communicated with the partition plate hole on the partition plate; the pipe wall of the flow guide pipe is provided with at least one flow guide hole which is communicated with an internal flow passage of the flow guide pipe and an upper annular cavity of the pressure container;

the floating valve is arranged between the draft tube and the partition plate hole and communicated with the draft tube and the partition plate hole, can slide up and down along the axial direction of the draft tube under the action of buoyancy or gravity of coolant, is closed on the partition plate hole or is opened to partition or communicate the upper annular cavity and the lower annular cavity of the pressure vessel;

the driving assembly is arranged in the flow guide pipe and drives the coolant in the upper annular cavity to enter the flow guide pipe and flow into the lower annular cavity through the floating valve.

Preferably, the floating valve comprises a valve body matched at the lower port of the flow guide pipe, and an annular baffle plate connected to the periphery of one end of the valve body and positioned outside the lower port;

the valve body is provided with a circulation channel which runs through the two opposite ends of the valve body, and the circulation channel is communicated with the inner flow passage of the flow guide pipe and the partition plate hole;

an annular through hole is formed between the periphery of the valve body and the inner wall of the partition plate hole, and the baffle plate slides up and down along the axial direction of the flow guide pipe along with the valve body and is closed on the annular through hole or separated from the annular through hole.

Preferably, the valve body is embedded in the inner side of the lower port of the flow guide pipe or sleeved outside the port.

Preferably, the baffle plate is provided with a convex part protruding towards the baffle plate, and the baffle plate on the periphery of the baffle plate hole is provided with a clamping groove matched with the convex part; when the baffle plate closes the annular through hole, the protruding part is clamped in the clamping groove.

Preferably, the width of the baffle is greater than the width of the annular through hole.

Preferably, the drive assembly comprises a drive shaft extending in the axial direction of the draft tube, an impeller connected to the lower end of the drive shaft; the upper end of the drive shaft extends to the upper end of the pressure vessel.

Preferably, the impeller is located below the guide hole in the axial direction of the guide pipe.

Preferably, the floating valve arrangement further comprises a motor connected to the drive shaft; the motor is arranged outside the pressure container.

Preferably, the floating valve arrangement further comprises a support; the support member is located at the periphery of the partition hole and is connected between the lower end of the draft tube and the partition.

Preferably, the support comprises at least one support bar; or the support member is a support wall which is connected between the peripheral surface of the lower end of the flow guide pipe and the partition plate in a surrounding manner, and the support wall is provided with at least one through hole which is communicated with the partition plate hole and the upper annular cavity.

The invention also provides a working method of the floating valve device, which comprises the following steps:

under the normal operation working condition, under the driving of the driving assembly, the coolant in the upper annular cavity in the pressure vessel enters the flow guide pipe, flows into the lower annular cavity through the floating valve, and then enters the hanging basket from the bottom of the hanging basket in the pressure vessel to cool the reactor core in the hanging basket; the coolant heated after passing through the reactor core enters the upper annular cavity through an outlet on the hanging basket;

under the condition of an accident, the floating valve slides upwards along the axial direction of the flow guide pipe under the buoyancy action of the coolant, the partition plate hole is opened, the coolant in the upper annular cavity in the pressure container flows into the lower annular cavity through the partition plate hole, and then enters the hanging basket from the bottom of the hanging basket in the pressure container to cool the reactor core in the hanging basket; the coolant heated after passing through the reactor core enters the upper annular cavity through an outlet on the hanging basket.

The invention also provides a pressure container, which comprises a container body, a hanging basket arranged in the container body, a partition plate arranged at the lower end in the container body and connected between the peripheral side surface of the hanging basket and the inner wall surface of the container body, and at least one floating valve device arranged on the partition plate.

The floating valve device is used in a pressure container, utilizes the buoyancy of a coolant and the driving force of a driving component on the coolant, and is matched with a buoyancy valve to realize the switching of the coolant of a nuclear reactor in a normal operation flow channel and an accident condition flow channel, thereby solving the difficult problems that an active device and the power of the valve are difficult to input under the environment of high temperature and strong irradiation; the floating valve is associated with the driving assembly, so that the negative influence of the turbulence of the coolant flow field in the nuclear reactor on the function executing mechanism is avoided.

The invention is also suitable for nuclear reactors using metal solution as coolant;

drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic cross-sectional view of a pressure vessel according to an embodiment of the present invention;

fig. 2 is an enlarged schematic view of a portion a of fig. 1.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1, the pressure vessel of an embodiment of the present invention includes a vessel body 10, a basket 20, a partition 30, and at least one floating valve device.

The basket 20 is disposed in the container body 10, is mainly located at a central position in the container body 10 and extends to the upper end of the container body 10 in the axial direction of the container body 10. A core (not shown) is provided in the nacelle 20. The partition 30 is disposed at the inner lower end of the vessel body 10 and connected between the outer peripheral side surface of the basket 20 and the inner wall surface of the vessel body 10, and divides the inner space of the vessel body 10 into an upper annular chamber 101 located above the partition 30 and surrounding the outer periphery of the basket 20, and a lower annular chamber 102 located below the partition 30 and the basket 20.

The upper end of the basket 20 is provided with an outlet 21 which extends through the interior of the basket 20 and the upper annulus 101, and coolant within the basket 20 can flow through the outlet 21 to the upper annulus 101. The bottom of the basket 20 is communicated with the lower annular cavity 102, and the bottom of the basket 20 is provided with a flow distributor 22 for equalizing the flow of the coolant entering the interior of the basket 20 from the lower annular cavity 102.

The baffle plate 30 is provided with at least one baffle plate hole 31 which can communicate the upper annular chamber 101 and the lower annular chamber 102. The floating valve device is provided on the partition 30 corresponding to the partition hole 31.

Referring to fig. 1 and 2, the floating valve assembly includes a delivery tube 40, a floating valve 50, and a driving assembly 60.

The draft tube 40 is vertically disposed on the partition plate 30 to communicate with the partition hole 31 of the partition plate 30, so that the coolant of the lower ring chamber 102 can enter the draft tube 40 through the partition hole 31. The lower end of the draft tube 40 facing the partition 30 is opposite to and communicates with the partition hole 31; the draft tube 40 extends away from the upper end of the partition 30 to the upper end of the vessel body 10.

At least one flow guide hole 41 is formed on the wall of the draft tube 40 to communicate the inner flow passage of the draft tube 40 with the upper annular chamber 102, so that the coolant in the upper annular chamber 102 can enter the draft tube 40 through the flow guide hole 41. The coolant in the draft tube 40 then passes from the lower end through the baffle holes 31 into the lower annulus 102.

The floating valve 50 is arranged between the draft tube 40 and the partition plate hole 31 and is communicated with the draft tube 40 and the partition plate hole 31, and the floating valve 50 can slide up and down along the axial direction of the draft tube 40 under the buoyancy or gravity action of the coolant to close on the partition plate hole 31 or open the partition plate hole 31 to separate or communicate the upper annular cavity 101 and the lower annular cavity 102 of the pressure vessel.

Specifically, the float valve 50 may include a valve body 51 fitted at the lower port of the draft tube 40, and an annular baffle 52 attached to the outer periphery of one end of the valve body 51 and located outside the lower port of the draft tube 40. The valve body 51 is provided with a flow passage 510 penetrating opposite ends thereof, and the flow passage 510 communicates with the inner flow passage of the draft tube 40 and the partition hole 31.

The overall diameter of the valve body 51 and the port of the delivery pipe 40 where the valve body is located is smaller than the inner diameter of the partition hole 31, so that a gap is reserved between the valve body 51 and the port of the delivery pipe 40 where the valve body is located and the partition hole 31.

Depending on the arrangement, the valve body 51 may be fitted inside the lower port of the draft tube 40, as shown in fig. 2. Alternatively, the valve body 51 may be fitted to the outside of the port. One end portion of the valve body 51 protrudes outside the draft tube 40 in the axial direction, and the baffle 52 is provided on the outer periphery of the end portion.

An annular through hole 32 is formed between the outer periphery of the valve body 51 and the inner wall of the partition hole 31, and the baffle plate 52 slides up and down along the axial direction of the draft tube 40 along with the valve body 51, and is closed on the annular through hole 32 or leaves the annular through hole 32. The width of the baffle plate 52 is larger than the width of the annular through hole 32 so that the peripheral edge portion of the baffle plate 52 abuts on the partition plate 30 when the baffle plate is closed on the annular through hole 32.

The provision of the baffle plate 52 can also increase the area of the valve body 51 in the lateral direction. The flapper 52 provides a buoyant drive for the raising of the valve body 51 during accident conditions.

Furthermore, the baffle plate 52 is provided with a convex part 53 protruding towards the direction of the baffle plate 30, the baffle plate 30 is provided with a clamping groove 33 matched with the convex part 53, and the clamping groove 33 is positioned at the periphery of the baffle plate hole 31. When the ring-shaped through hole 32 is closed by the shutter 52, the projection 53 is engaged with the engaging groove 33, and functions to stabilize the shutter 52.

The drive assembly 60 is disposed within the delivery tube 40 to drive the coolant in the upper annulus 101 into the delivery tube 40 and through the float valve 50 (through the flow passage 510) into the lower annulus 102.

The drive assembly 60 may include a drive shaft 61 and an impeller 62 coupled to the drive shaft 61. A drive shaft 61 extends axially within the draft tube 40 along the draft tube 40 and has an upper end that extends to the upper end of the pressure vessel and an impeller 62 connected to the lower end of the drive shaft 61. After the drive shaft 61 rotates to rotate the impeller 62, the coolant outside the draft tube 40 is sucked into the draft tube 40.

In the present embodiment, the impeller 62 is located below the guide hole 41 in the axial direction of the guide pipe 40.

The float valve device of the present invention further includes a motor (not shown) connected to the drive shaft 61. The motor is disposed outside the pressure vessel and is connected to and drives the drive shaft 61 to rotate.

In the present invention, the driving assembly 60 provides power for the flow of the coolant to ensure sufficient pressure flow, and the baffle plate 30 does not need to be provided in two layers.

Further, the floating valve device of the present invention further comprises a support 70. The support 70 is positioned at the periphery of the partition hole 31 and coupled between the lower end of the draft tube 40 and the partition plate 30, and supports the draft tube 40 to be positioned above the partition plate 30.

Alternatively, the support 70 may include at least one support bar. Alternatively, as shown in fig. 2, the support member 70 is a support wall enclosed between the outer peripheral surface of the lower end of the draft tube 40 and the partition plate 30, and has an annular shape as a whole. The support wall is provided with at least one through hole 71 communicating the partition hole 31 with the upper ring chamber 102.

Referring to fig. 1-2 and to the coolant flow direction indicated by the arrows in fig. 1, the method of operation of the float valve assembly of the present invention comprises:

under the normal operation condition, under the driving of the driving assembly 60, the coolant in the upper annular cavity 101 in the pressure vessel enters the flow guide pipe 40, flows into the lower annular cavity 102 through the floating valve 50, specifically passes through the flow passage 510 and the partition hole 31, meanwhile, the floating valve 50 is pressed down to be closed on the partition hole 31 under the action of the coolant, the annular through hole 32 is closed through the partition plate 52, and the direct communication between the upper annular cavity 101 and the lower annular cavity 102 is blocked. The coolant enters the hanging basket 20 from the bottom of the hanging basket 20 in the pressure vessel (flows uniformly through the flow distributor 22) to cool the reactor core in the hanging basket 20; the coolant heated after passing through the reactor core enters the upper annular cavity 101 through an outlet 21 on the hanging basket 20; in this way, the coolant completes one cycle of normal operation.

Under the condition of an accident (namely, the driving assembly 60 loses power and stops running), the floating valve 50 slides upwards along the axial direction of the flow guide pipe 40 under the buoyancy action of the coolant, and the partition plate hole 31 is opened, so that the lower annular cavity 102 is communicated with the upper annular cavity 101 through the partition plate hole 31; the coolant in the upper annular cavity 101 in the pressure vessel flows into the lower annular cavity 102 through the partition plate holes 31, and then enters the hanging basket 20 from the bottom of the hanging basket 20 in the pressure vessel (after flow equalization by the flow distributor 22) to cool the reactor core in the hanging basket 20; the coolant heated after passing through the reactor core enters the upper annular cavity 101 through an outlet 21 on the hanging basket 20; in this way, the coolant completes one cycle of the accident situation.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.