Reactor control rod hydraulic driving system

Abstract

A reactor control rod hydraulic driving system belongs to the technical field of nuclear reactor engineering. The problems that in the prior art, in the lifting process of the control rod through a magnetic lifting mechanism, the heat dissipation requirement of the magnetic lifting mechanism is high, a control line is too long, and a driving system is complex are solved. The coolant working medium circulating loop comprises a circulating pump, a regulating valve, a first main pipeline and a second main pipeline, an outflow end pipeline of the circulating pump is connected to an inflow end of the regulating valve, an outflow end pipeline of the regulating valve is connected to an inflow end of the first main pipeline, and an outflow end pipeline of the first main pipeline is connected to inflow ends of the driving cylinder assemblies; the outflow end pipelines of the driving cylinder assemblies are connected with the inflow end of the second main pipeline, and the outflow end pipeline of the second main pipeline is connected to the inflow end of the circulating pump. The requirement for heat dissipation of the system is lowered, a coolant working medium circulation loop is independently arranged, a lifting transmission line of the system is shortened, and multiple sets of driving cylinder assemblies are conveniently driven to complete corresponding motion states.

Description

Technical Field

[0001] The invention relates to a hydraulic driving system for a reactor control rod, belonging to the technical field of nuclear reactor engineering. Background Art

[0002] Nuclear reactor control rods and their drive devices are important equipment of the reactor. They undertake the important tasks of reactor startup, power regulation, shutdown and emergency shutdown in accident conditions. Whether they can work normally is directly related to reactor safety. Based on whether the drive cylinder assembly is inside or outside the pressure vessel, they can be divided into built-in or external types; based on the drive mode, they can be divided into mechanical drive, magnetic lifting, motor drive and hydraulic drive.

[0003] Commercial pressurized water reactors use a magnetic lifting mechanism, which can lift the control rods through electromagnetic force and work in conjunction with the pin claws. It has the advantages of fast action, simple structure, and strong lifting force. However, the magnetic lifting mechanism has high requirements for heat dissipation and needs to be cooled at all times, which increases the heat dissipation cost of the system. Due to the characteristics of the magnetic lifting mechanism itself, the lifting transmission line required by it cannot be set separately, resulting in the length of the lifting transmission line of each magnetic lifting mechanism being too long, which greatly increases the reactor height and the risk of rod jamming. At the same time, each magnetic lifting mechanism requires an independent drive system, which not only increases the instability of the system but also takes up too much space. Summary of the invention

[0004] In view of this, the present invention aims to propose a hydraulic drive system for reactor control rods to solve the problems in the prior art of high heat dissipation requirements of the magnetic lifting mechanism, too long control lines and the need for an independent drive circuit for each set of magnetic lifting mechanisms, which cause the complex drive system.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A reactor control rod hydraulic drive system comprises a pressure vessel, a cooling medium circulation loop, a control rod, a core and a drive cylinder assembly, wherein the drive cylinder assembly is one or more, and when the drive cylinder assembly is multiple, the cooling medium circulation loop comprises a circulation pump, a regulating valve, a first main pipeline and a second main pipeline, the outflow end of the circulation pump is connected to the inflow end of the regulating valve through a pipeline, the outflow end of the regulating valve is connected to the inflow end of the first main pipeline through a pipeline, the outflow end of the first main pipeline is connected to the inflow ends of multiple drive cylinder assemblies through pipelines, the outflow ends of the multiple drive cylinder assemblies are connected to the inflow end of the second main pipeline through pipelines, and the outflow end of the second main pipeline is connected to the inflow end of the second main pipeline. The end is connected to the inflow end of the circulation pump through a pipeline to complete the connection of the cooling medium circulation loop. When there is only one driving cylinder assembly, the outflow end of the regulating valve is connected to the inflow end of the driving cylinder assembly through a pipeline, the outflow end of the driving cylinder assembly is connected to the inflow end of the circulation pump through a pipeline, and the outflow end of the circulation pump is connected to the inflow end of the regulating valve through a pipeline to complete the connection of the cooling medium circulation loop. The pressure vessel and the driving cylinder assembly are both filled with cooling medium. A stop valve is connected to the connecting pipeline between the pressure vessel and the inflow end of the circulation pump. The control rod is fixedly connected to the bottom end of the driving cylinder assembly, and the control rod is slidably connected to the core. The core is arranged in the pressure vessel.

[0007] Furthermore, the cooling medium flows through the drive cylinder assembly from bottom to top.

[0008] Furthermore, a filter is arranged between the circulation pump and the regulating valve.

[0009] Furthermore, a solenoid valve is provided at the lower end of each of the driving cylinder assemblies.

[0010] Furthermore, the drive cylinder assembly, the first main pipeline and the second main pipeline are all arranged in a pressure vessel.

[0011] Compared with the prior art, the present invention has the following effects:

[0012] The reactor control rod hydraulic drive system of the present application dissipates heat from the drive cylinder assembly by circulating the cooling medium in the cooling medium circulation loop, thereby reducing the system heat dissipation requirements and the system heat dissipation costs;

[0013] The cooling medium circulation loop of the reactor control rod hydraulic drive system of the present application is separately set, which can realize the separate control of the cooling medium circulation loop, and at the same time greatly shorten the lifting transmission line of the system, further improving the stability of the system;

[0014] The cooling medium circulation loop of the present application can drive multiple groups of drive cylinder components to complete corresponding motion states, simplifying the control process and reducing control costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 The first structural schematic diagram of the reactor control rod hydraulic drive system (when there is only one drive cylinder assembly);

[0017] Figure 2 The second structural schematic diagram of the reactor control rod hydraulic drive system (when there are multiple drive cylinder assemblies);

[0018] In the figure: 1. circulating pump; 2. filter; 3. regulating valve; 4. stop valve; 5. solenoid valve; 6. first main pipeline; 7. second main pipeline; 8. control rod; 9. core; 10. pressure vessel; 11. drive cylinder assembly. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0020] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Referring to the accompanying drawings, this embodiment is described. A reactor control rod hydraulic drive system includes a pressure vessel 10, a cooling medium circulation loop, a control rod 8, a core 9 and a drive cylinder assembly 11. The drive cylinder assembly 11 is one or more. When the drive cylinder assembly 11 is multiple, the cooling medium circulation loop includes a circulation pump 1, a regulating valve 3, a first main pipeline 6 and a second main pipeline 7. The outflow end of the circulation pump 1 is connected to the inflow end of the regulating valve 3 through a pipeline, the outflow end of the regulating valve 3 is connected to the inflow end of the first main pipeline 6 through a pipeline, the outflow end of the first main pipeline 6 is connected to the inflow ends of multiple drive cylinder assemblies 11 through a pipeline, the outflow ends of the multiple drive cylinder assemblies 11 are connected to the inflow end of the second main pipeline 7 through a pipeline, and the second main pipeline 7 is connected to the inflow end of the second main pipeline 7 through a pipeline. The outflow end of the pipeline 7 is connected to the inflow end of the circulation pump 1 through a pipeline, thus completing the connection of the cooling medium circulation loop. When there is only one driving cylinder assembly 11, the outflow end of the regulating valve 3 is connected to the inflow end of the driving cylinder assembly 11 through a pipeline, and the outflow end of the driving cylinder assembly 11 is connected to the inflow end of the circulation pump 1 through a pipeline. The outflow end of the circulation pump 1 is connected to the inflow end of the regulating valve 3 through a pipeline, thus completing the connection of the cooling medium circulation loop. The pressure vessel 10 and the driving cylinder assembly 11 are both filled with cooling medium. The connecting pipeline between the pressure vessel 10 and the inflow end of the circulation pump 1 is connected to the stop valve 4. The control rod 8 is fixedly connected to the bottom end of the driving cylinder assembly 11, and the control rod 8 is slidably connected to the core 9, which is arranged in the pressure vessel. The technical solutions of the driving cylinder assembly 11, the control rod 8 and the core 9 are prior art and will not be repeated here. The cooling medium flows from the pressure vessel 10 into the cooling medium circulation loop through the stop valve 4. When the cooling medium in the cooling medium circulation loop is reduced, it can also be replenished through the stop valve 4, thereby ensuring that the cooling medium circulation loop is always full of cooling medium. Based on the simple structure of the cooling medium circulation loop, the difficulty of connecting with multiple sets of drive cylinder assemblies 11 can be reduced, the control process is simplified, and the control cost is saved.

[0022] The reactor control rod hydraulic drive system of the present application dissipates heat from the drive cylinder assembly by circulating the cooling medium in the cooling medium circulation loop, thereby reducing the system heat dissipation requirements and the system heat dissipation cost; the cooling medium circulation loop of the reactor control rod hydraulic drive system of the present application is separately set, which can realize the separate control of the cooling medium circulation loop, and at the same time greatly shortens the system's lifting transmission line, further improving the stability of the system; each cooling medium circulation loop of the present application can drive multiple drive cylinder assemblies to complete corresponding motion states, simplifying the control process and reducing the control cost.

[0023] The cooling medium flows through the drive cylinder assembly 11 from bottom to top. According to the flow characteristics of the liquid, flowing through the drive cylinder assembly 11 from bottom to top can prevent bubbles from being generated in the drive cylinder assembly 11 and prevent the cooling blind area from being affected by the cooling medium's own gravity. Therefore, the cooling medium flows through the drive cylinder assembly 11 from bottom to top, which can greatly improve the heat dissipation degree of the drive cylinder assembly 11.

[0024] A filter 2 is arranged between the circulating pump 1 and the regulating valve 3. The filter 2 mainly realizes filtering and separation of the cooling medium and impurities in the cooling medium circulation loop, so as to prevent the cooling medium from accumulating too many impurities in the cooling medium circulation loop, thereby affecting circulation and heat dissipation.

[0025] The lower end of each of the driving cylinder assemblies 11 is provided with a solenoid valve 5. Specifically, the solenoid valve 5 is in an open state when the power is off. When the power is off or the cooling medium circulation loop system loses pressure, the solenoid valve 5 opens to allow the coolant medium in the cooling medium circulation loop to flow into the pressure vessel 10, which relieves the pressure of the coolant medium circulation loop, thereby improving the stability of the system.

[0026] The drive cylinder assembly 11, the first main pipeline 6 and the second main pipeline 7 are arranged in the pressure vessel 10. The drive cylinder assembly 11 needs to dissipate heat through a cooling medium, and the control rods 8 and the core 9 also need cooling medium for cooling. The pressure vessel 10 is filled with cooling medium, and then the drive cylinder assembly 11, the control rods 8 and the core 9 are placed in the pressure vessel 10 to achieve an optimal working environment.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A reactor control rod hydraulic drive system, characterized in that: The invention comprises a pressure vessel (10), a cooling medium circulation loop, a control rod (8), a core (9) and a drive cylinder assembly (11). The drive cylinder assembly (11) is one or more. When the drive cylinder assembly (11) is multiple, the cooling medium circulation loop comprises a circulation pump (1), a regulating valve (3), a first main pipeline (6) and a second main pipeline (7). The outflow end of the circulation pump (1) is connected to the inflow end of the regulating valve (3) through a pipeline. The outflow end of the regulating valve (3) is connected to the inflow end of the first main pipeline (6) through a pipeline. The outflow end of the first main pipeline (6) is connected to the inflow ends of the multiple drive cylinder assemblies (11) through pipelines. The outflow ends of the multiple drive cylinder assemblies (11) are connected to the inflow end of the second main pipeline (7) through pipelines. The outflow end of the second main pipeline (7) is connected to the inflow end of the second main pipeline (7) through pipelines. The connection to the inflow end of the circulation pump (1) completes the connection of the cooling medium circulation loop. When there is only one driving cylinder assembly (11), the outflow end of the regulating valve 3 is connected to the inflow end of the driving cylinder assembly (11) through a pipeline, and the outflow end of the driving cylinder assembly (11) is connected to the inflow end of the circulation pump 1 through a pipeline. The outflow end of the circulation pump (1) is connected to the inflow end of the regulating valve (3) through a pipeline to complete the connection of the cooling medium circulation loop. The pressure vessel (10) and the driving cylinder assembly (11) are both filled with cooling medium. The stop valve (4) is connected to the connecting pipeline between the pressure vessel (10) and the inflow end of the circulation pump (1). The control rod (8) is fixedly connected to the bottom end of the driving cylinder assembly (11). The control rod (8) is slidably connected to the inside of the core (9), and the core (9) is arranged in the pressure vessel.

2. A reactor control rod hydraulic drive system according to claim 1, characterized in that: The cooling medium flows through the drive cylinder assembly (11) from bottom to top.

3. A reactor control rod hydraulic drive system according to claim 1, characterized in that: A filter (2) is arranged between the circulation pump (1) and the regulating valve (3).

4. A reactor control rod hydraulic drive system according to claim 1, characterized in that: A solenoid valve (5) is provided at the lower end of each driving cylinder assembly (11).

5. A reactor control rod hydraulic drive system according to claim 1, characterized in that: The drive cylinder assembly (11), the first main pipeline (6) and the second main pipeline (7) are all arranged in a pressure container (10).

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