A ball controller for high temperature gas-cooled reactor

Abstract

The present invention proposes a ball-passing controller for high-temperature gas-cooled reactors, comprising a driving motor, a coupling, a magnetic transmission device and a housing connected in sequence, the housing comprising an end cover and a shell body fixedly connected, the working chamber in the shell body just accommodating a circular dial driven by a magnetic rotor in the magnetic transmission device, the edge of the circular dial being covered with a plurality of identical circular arc grooves, the centers of all the circular arc grooves falling on a circle; a vertical ball-passing channel having an axis tangent to the surface of the shell working chamber is provided through the shell body; when the spherical element is located at the tangent point between the shell working chamber surface and the ball-passing channel, the spherical element is blocked by the circular arc groove and the ball-passing channel and stops flowing, and the spherical element resumes flowing after passing the tangent point as the circular dial rotates. The present invention can realize the single passing of the spherical element, and ensure the integrity of the passing of the spherical element, avoiding the problems of ball cutting and ball jamming, and is particularly suitable for high-temperature gas-cooled reactors with frequent start-stop conditions of the fuel element conveying device.

Description

Technical Field

[0001] The invention belongs to the technical field of reactor engineering equipment, and in particular relates to a ball controller applied to a high-temperature gas-cooled reactor. Background Art

[0002] The pebble bed high temperature gas-cooled reactor can realize continuous refueling without stopping the reactor. Chinese invention patent CN101083153A discloses an online refueling system for pebble bed high temperature gas-cooled reactor, which can be applied to high-power high temperature gas-cooled reactor commercial power plants. The system uses the characteristics of fuel balls (spherical elements) that are easy to roll and transports them through pipelines, so that new fuel balls are continuously loaded into the core and spent fuel balls are unloaded from the core. The high temperature gas-cooled reactor nuclear power plant demonstration project HTR-PM (High Temperature Modular Pebble Bed Reactor Project) is an implementation case of the invention patent. The demonstration project uses dual-reactor operation, and a single reactor can circulate 6,000 balls per day.

[0003] In each process of the online refueling system of the demonstration project HTR-PM, including fuel consumption measurement, new fuel ball lifting, etc., operations are completed based on a single spherical element. Therefore, the system must be equipped with a dedicated spherical element single pass control device. For example, Chinese invention patent CN102097144A discloses a spherical element single conveying device for high temperature gas-cooled reactors. The device consists of a box, a rotor and a driving component. The box includes at least one goal channel and at least one ball outlet channel. The rotor includes at least one ball receiving cup. The rotor must accurately rotate to a position coaxial with the goal channel or the ball outlet channel to ensure that the spherical element enters the rotor ball receiving cup from the goal channel or the spherical element enters the ball outlet channel from the rotor ball receiving cup. In the operating environment of frequent start-stop, the control accuracy of the driving motor rotation angle is strictly required. If the spherical element is adhered with debris so that the height of the spherical element after falling into the ball receiving cup exceeds the gap between the ball receiving cup and the working chamber, the box may cut the ball and damage the spherical element when the rotor rotates. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a ball-passing controller applied to a high-temperature gas-cooled reactor to control the passage of spherical elements in a single manner, ensure the integrity of the passage of spherical elements, avoid the problem of ball cutting and ball jamming, and is particularly suitable for frequent start-stop operation environments. Even if the drive motor loses step and overshoots, it does not affect the reliable passage of the spherical elements in a single manner. In addition, the debris between the spherical elements can pass through the ball-passing controller by its own weight.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention proposes a ball-passing controller for high-temperature gas-cooled reactors, comprising a driving motor, a coupling, a magnetic transmission and a housing connected in sequence, wherein the housing comprises an end cover and a shell body fixedly connected, the magnetic transmission is fastened to the end cover by a pressure cover, and the inner magnetic rotor of the magnetic transmission passes through the center of the end cover; it is characterized in that the working chamber in the shell body just accommodates a circular dial driven by the inner magnetic rotor of the magnetic transmission, the edge of the circular dial is covered with a plurality of identical circular arc grooves, and the centers of all the circular arc grooves fall on a circle; the shell body is also penetrated by a vertical ball-passing channel whose axis is tangent to the surface of the working chamber of the shell body; when the spherical element is located at the tangent point between the surface of the working chamber of the shell body and the ball-passing channel, the spherical element is blocked by the circular arc groove and the ball-passing channel and stops flowing, and the spherical element resumes flowing after passing the tangent point as the circular dial rotates.

[0007] The ball-passing controller applied to a high-temperature gas-cooled reactor proposed in the present invention has the following advantages:

[0008] 1. The ball passage in the present invention is an integral structure, and there is no problem of damaging the spherical element by cutting the ball; the circular dial can effectively ensure that the spherical element passes through in a single manner.

[0009] 2. The circular dial has a wide range of ball receiving angles and ball releasing angles, allowing a certain degree of drive motor step-out and overshoot.

[0010] 3. There is a large gap between the top of the circular dial tooth and the inner wall of the ball passage. Large pieces of spherical component debris in the ball passage can pass directly by relying on their own weight to avoid ball jamming.

[0011] 4. The use of magnetic transmission and metal sealing ring static sealing can effectively seal the hot helium atmosphere and avoid leakage of radioactive helium. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an axial view of the overall structure of the ball passing controller according to an embodiment of the present invention;

[0013] Figure 2 It is a side sectional view of a ball passing controller according to an embodiment of the present invention;

[0014] Figure 3 A schematic diagram of the structure of a circular dial in an embodiment of the present invention;

[0015] Figure 4 2 is a side view of a circular dial in an embodiment of the present invention.

[0016] Wherein: 1-housing, 2-circular dial, 3-shifting teeth, 4-working chamber surface, 5-bolt, 6-spherical element inlet pipe, 7-ball passage, 8-spherical element, 9-arc-shaped incision, 10-ball passage axis, 11-spherical element outlet pipe, 12-driving motor, 13-coupling, 14-magnetic transmission, 15-fastener, 16-metal sealing ring, 17-screw, 18-bearing seat, 19-bearing, 20-center surface, 21-first shaft, 22-elastic retaining ring, 23-end cover, 24-pressure cover, 25-connecting shaft. DETAILED DESCRIPTION

[0017] The high temperature gas-cooled reactor ball controller proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0018] See also Figures 1 to 4 The embodiment of the present invention proposes a ball controller for high temperature gas-cooled reactor, the main function of which is to control the single passing of spherical elements to ensure the integrity of the passing of spherical elements. The ball controller includes a driving motor 12, a coupling 13, a magnetic transmission device 14 and a box body connected in sequence, the box body includes an end cover 23 and a shell 1 that are fixedly connected, the magnetic transmission device 14 is fastened to the end cover 23 through a pressure cover 24, and the inner magnetic rotor of the magnetic transmission device 14 passes through the center of the end cover 23; the working chamber in the shell 1 just accommodates the magnetic transmission device 14. 14, a circular dial 2 driven by an internal magnetic rotor, the edge of which is covered with a plurality of identical arc grooves, the centers of which all fall on a circle; a vertical ball passage 7 with an axis tangent to the surface of the working chamber of the shell 1 is also provided through the shell 1; it is ensured that when the spherical element 8 is located at the tangent point between the surface of the working chamber of the shell 1 and the ball passage 7 (coinciding with the midpoint of the ball passage 7), the spherical element 8 is blocked by the arc grooves and the ball passage 7 and stops flowing, and the spherical element 8 resumes flowing after passing the tangent point as the circular dial 2 rotates.

[0019] The specific implementation methods and functions of each component of the embodiment of the present invention are as follows:

[0020] The driving motor 12, the coupling 13 and the magnetic transmission 14 are arranged on the first axis 21 and together constitute the driving component of the ball controller, which is used to provide power for the circular dial 2 and control the rotation speed and direction of the circular dial 2. In this embodiment, the driving motor 12 adopts a stepper motor or a servo motor. In addition, other driving motors with compact structure, simple control and reliable performance can also be adopted. The magnetic transmission 14 adopts a cylindrical magnetic transmission, including an outer magnetic rotor, an inner magnetic rotor and a non-magnetic isolation sleeve. The magnetic transmission can realize contactless and leakage-free torque transmission, wherein the outer magnetic rotor is connected to the output shaft of the stepper motor through the coupling 13, the isolation sleeve is fixed to the end cover 23 through the pressure cover 24 and the fastener 15, and the inner magnetic rotor passes through the middle part of the end cover 23 and is connected to the circular dial 2 in the housing 1 to realize the driving of the circular dial 2.

[0021] The housing 1 and the end cover 23 serve as supporting components of the present ball controller and are used to realize the installation of other components in the present ball controller. The housing 1 and the end cover 23 are fixedly connected by bolts 5, and the connection between the two is sealed by a metal sealing ring 16. The cross-sections of the housing 1 and the end cover 23 of this embodiment are both hexagonal, and are symmetrical structures formed by cutting off the two corners of a rectangle. A through hole is opened in the middle of the end cover 23 for the inner magnetic rotor of the magnetic transmission device 14 to pass through, and the through hole and the inner magnetic rotor share the first axis 21. One end of the housing 1 connected to the end cover 23 is an open end, and the other end is a closed end. The open end of the housing 1 is connected to one side of the circular dial 2 through a bearing seat 18 (the bearing seat 18 is fastened to the side of the open end of the housing 1 by screws 17) and a bearing 19, and the bearing 19 is axially fixed by an elastic retaining ring 22. A cylindrical hole sharing the first axis 21 with the circular dial 2 is provided on the inner side surface of the closed end of the housing 1, and a bearing connected to the other side of the circular dial 2 is provided at the cylindrical hole, and the bearing is also axially fixed by an elastic retaining ring. A cylindrical working chamber for accommodating a circular dial 2 is provided in the middle of the shell 1, and the working chamber is co-centric with the circular dial 2. Furthermore, the working chamber surface 4 of the shell 1 and the center of each arc groove of the circular dial 2 fall on a circle; a ball passing channel 7 perpendicular to the first axis 21 and passing through the shell 1 is also provided on one side of the cylindrical working chamber in the shell 1, the ball passing channel axis 10 is tangent to the working chamber surface 4 of the shell 1, and the ball passing channel axis 10 is in the same plane as the center plane 20 in the thickness direction of the circular dial 2, and an arc-shaped incision 9 is formed on the side wall of the ball passing channel 7 close to the working chamber surface 4; the upper and lower ends of the ball passing channel 7 are respectively connected to the spherical element inlet pipe 6 and the spherical element outlet pipe 11, the spherical element inlet pipe 6 and the spherical element outlet pipe 11 are coaxial with the ball passing channel 7 and have equal inner diameters. In this embodiment, the inner diameter ranges from Φ64mm to 66mm.

[0022] The circular dial 2 and the ball passage 7 are the core components for achieving the uniform passage of the spherical element 8. The circular dial 2 of this embodiment is formed by milling 15 arc grooves on the surface of a cylinder of uniform thickness (the cylinder is made of austenitic stainless steel), and the arc grooves are all distributed on the surface of the cylinder, and the radius of each arc groove is the same, which is R31mm (such as Figure 3 As shown in a), it is slightly larger than the radius R30mm of the spherical element 8, and the centers of all arc grooves fall on the same circle, the diameter of which is Φ304mm (as shown in Figure 3 As shown in c), the top of each circular arc groove serves as a shifting tooth, the distance between the top of the shifting tooth and the working chamber surface 4 is between 4mm and 6mm, and the angle between adjacent shifting teeth is 24° (as shown in Figure 3 As shown in b), the diameter of the circle formed by adjacent teeth connected in sequence is Φ285mm (as shown in Figure 3 As shown in d), the thickness of the circular dial can be 66mm to 68mm (as shown in Figure 4 As shown in e). The side wall away from the arc groove at the midpoint of the ball passage 7 forms a limit to the spherical element 8 with the arc groove, so that the spherical element 8 is blocked and stops sinking and flowing, but the spherical element debris can pass through by its own weight. The circular dial 2 is installed in the housing 1 on both sides through the connecting shaft 25 (the connecting shaft is located on the first shaft 21). Furthermore, the surfaces of the dial teeth, arc groove and arc-shaped cutout 9 of the arc dial 2 are all provided with a surfacing wear-resistant material layer, and all adopt rounded corners, which can reduce the friction between the circular dial 2 and the spherical element 8 and protect the spherical element 8 from damage. By controlling the rotation speed and start-stop time of the circular dial 2, the time for the spherical element 8 to pass through the ball controller in a single way can be conveniently controlled. For example, in this embodiment, it takes 2 seconds for the circular dial 2 to rotate 24° each time it starts and stops, and it moves once every 10 seconds, so the time for the spherical element 8 to pass through in a single way is 12 seconds.

[0023] The working process of the ball passing controller according to the embodiment of the present invention is as follows:

[0024] The spherical element 8 enters the ball-passing channel 7 by its own weight from the spherical element inlet pipe 6, and stops sinking and flowing due to the blocking of the teeth in the middle of the ball-passing channel 7; the driving motor 12 starts to rotate, and drives the outer magnetic rotor of the magnetic transmission device 14 through the coupling 13, and the outer magnetic rotor drives the inner magnetic rotor to rotate, thereby driving the circular dial 2 to rotate; the circular dial 2 rotates 24° clockwise, and the teeth behind the spherical element 8 slide downward along the ball-passing channel 7, and the arc groove between two adjacent teeth forms an envelope for the spherical element 8; as the circular dial 2 rotates, the spherical element 8 gradually separates from the arc groove, and finally flows out from the spherical element outlet pipe 11 by its own gravity. The teeth behind the spherical element 8 block the continued flow of the subsequent spherical element 8; the circular dial 2 continues to rotate, and the next spherical element 8 flows out, and so on, to ensure the single passage of the spherical element 8. When there are larger pieces of spherical component debris in the ball passing channel 7, due to the larger gap between the teeth 3 of the circular dial 2 and the inner wall of the ball passing channel 7, the spherical component debris can pass through by its own weight. In extreme cases, when the debris falls on the ball passing channel 7 and does not slide down directly, the circular dial 2 can be reversed by driving the motor 12, and the arc-shaped cutout 9 can be used to push the debris to slide down, thereby avoiding ball jamming.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention. As long as the unified ball passing device for spherical elements adopts an integral channel and tooth structure, regardless of the number of channels, the number of teeth and their sizes, they all fall within the protection scope of the present invention.

Claims

1. A ball controller for a high temperature gas-cooled reactor, comprising a driving motor (12), a coupling (13), a magnetic transmission device (14) and a housing connected in sequence, wherein the housing comprises an end cover (23) and a housing (1) which are fixedly connected, the magnetic transmission device (14) being fastened to the end cover (23) via a gland (24), and an inner magnetic rotor of the magnetic transmission device (14) passing through the center of the end cover (23); characterized in that: The working chamber in the shell (1) just accommodates a circular dial (2) driven by a magnetic rotor in a magnetic transmission device (14), the edge of the circular dial (2) is covered with a plurality of identical arc grooves, and the centers of all the arc grooves fall on a circle; the shell (1) is also provided with a vertical ball passage (7) whose axis is tangent to the surface of the working chamber of the shell (1); when the spherical element (8) is located at the tangent point between the surface of the working chamber of the shell (1) and the ball passage (7), the spherical element (8) is blocked by the arc groove and the ball passage (7) and stops flowing; when the spherical element (8) passes the tangent point as the circular dial (2) rotates, the flow is restored; The surface of the circular dial (2) in contact with the spherical element (8) is provided with a surfacing wear-resistant layer, and the connection between two adjacent arc grooves is provided with a rounded corner; The working chamber surface (4) of the housing (1) and the centers of the arc grooves of the circular dial (2) fall on a circle; One end of the housing (1) close to the end cover (23) is an open end, and the other end of the housing (1) is a closed end; protruding connecting shafts (25) are fixed on both sides of the center of the circular dial (2), the first connecting shaft is connected to the inner magnetic rotor of the magnetic transmission device (14), and the connecting shaft is connected to the open end of the housing (1) through a bearing (19) and a bearing seat (18); the second connecting shaft is connected to the inner side surface of the closed end of the housing (1) through another bearing.

2. The ball passing controller according to claim 1, characterized in that: Each of the bearings is axially fixed by an elastic retaining ring (22).

3. The ball passing controller according to claim 1, characterized in that: A metal sealing ring (16) is provided at the connection between the housing (1) and the end cover (23).

4. The ball passing controller according to claim 1, characterized in that: The driving motor (12) is a stepping motor or a servo motor.

Images