An electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor

Abstract

The present invention relates to an electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor, comprising an electromagnetic coil assembly, a magnetic conductive block, a hook assembly, an end and a push rod; the electromagnetic coil assembly is relatively fixedly connected to the hook assembly, and the magnetic conductive block is relatively fixedly connected to the push rod; the electromagnetic coil assembly cooperates with the magnetic conductive block to drive the push rod to act on the hook assembly so that the hook of the hook assembly can grasp / release the end. The beneficial effects of the present invention are as follows: 1. The hook assembly is driven by the electromagnetic coil assembly to grasp the end, thereby achieving the purpose of providing a large grasping force with a small electromagnetic force, preventing the control rod assembly under the end from falling off during vibration, and working reliably; 2. The electromagnetic device and the control rod assembly are automatically aligned and connected through the guide cylinder; 3. The reset spring is set to ensure that the control rod assembly can be quickly disengaged and released in the event of power failure.

Description

Technical Field

[0001] The invention relates to the field of nuclear technology, and in particular to an electromagnet device for a control rod driving mechanism of a pool-type low-temperature reactor. Background Art

[0002] The control rod drive mechanism is an important equipment to ensure the safety of the reactor. The performance of the control rod drive mechanism directly affects the safety of the nuclear reactor. The locking device is a key component of the control rod drive mechanism of the pool-type low-temperature reactor. It is related to the safety of the nuclear reactor and the refueling process.

[0003] Pool-type heating reactors have been used in China, but they have low power, a small number of control rod drive mechanisms, and a small weight of control rod assemblies, so the required lifting force is also small. If the lifting force is to be increased, the volume of the electromagnet device must be increased. The reactor core has the characteristics of compact layout, and generally there is limited space for the control rod drive mechanism. When designing the electromagnet device, the size restrictions must be considered, and it is required to work reliably.

[0004] There is no related technology in the prior art that can meet the above requirements.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] In view of the defects existing in the prior art, the object of the present invention is to provide an electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor, which can provide a large grasping force with a small electromagnetic force to grasp the end.

[0007] The technical solution of the present invention is as follows:

[0008] An electromagnet device for a control rod drive mechanism of a pool-type cryogenic reactor comprises an electromagnetic coil assembly, a magnetic conductive block, a hook claw assembly, an end and a push rod; the electromagnetic coil assembly is relatively fixedly connected to the hook claw assembly, and the magnetic conductive block is relatively fixedly connected to the push rod; the electromagnetic coil assembly cooperates with the magnetic conductive block to drive the push rod to act on the hook claw assembly so that the hook claw of the hook claw assembly grabs / releases the end.

[0009] Furthermore, in the above-mentioned electromagnet device for the control rod drive mechanism of the pool-type low-temperature reactor, the claw assembly includes a claw; the claw is connected to the electromagnetic coil assembly through a pin shaft and can rotate around the pin shaft to grasp / release the end head; the top rod is provided with upper teeth that cooperate with the claw to drive the claw to rotate.

[0010] Furthermore, in the above-mentioned electromagnet device for the control rod drive mechanism of the pool-type low-temperature reactor, the top rod is also provided with lower teeth, and the hook claw is provided with a lower conical surface that cooperates with the lower teeth; when the hook claw releases the end head, the lower teeth abut against the lower conical surface to prevent the hook claw from rotating.

[0011] Furthermore, in the above-mentioned electromagnet device for the control rod driving mechanism of the pool-type low-temperature reactor, an upper conical surface is provided at the end of the hook; when the push rod rises, the upper teeth act on the upper conical surface to push the hook to rotate and grasp the end head.

[0012] Furthermore, the above-mentioned electromagnet device for the control rod drive mechanism of the pool-type low-temperature reactor also includes an outer cylinder wall; the hook claw assembly also includes a cylinder body; the cylinder body is arranged inside the outer cylinder wall and can move along the outer cylinder wall; a centering hole for the push rod to pass through is arranged on the cylinder body; the size of the cylinder body matches the size of the outer cylinder wall.

[0013] Furthermore, in the above-mentioned electromagnet device for the control rod driving mechanism of the pool-type low-temperature reactor, a roller is also provided on the cylinder to facilitate the movement of the cylinder.

[0014] Furthermore, in the above-mentioned electromagnet device for the control rod driving mechanism of the pool-type low-temperature reactor, the number of the rollers is 2-4, which are evenly arranged around the cylinder.

[0015] Furthermore, in the above-mentioned electromagnet device for the control rod driving mechanism of the pool-type low-temperature reactor, a return spring is arranged between the magnetic conductive block and the electromagnetic coil assembly.

[0016] Furthermore, in the above-mentioned electromagnet device for the control rod drive mechanism of the pool-type low-temperature reactor, the number of the return springs is 1-4, and they are arranged on the central axis or the pitch circle of the magnetic conductive block.

[0017] Furthermore, in the above-mentioned electromagnet device for the control rod driving mechanism of the pool-type low-temperature reactor, a stop step cooperating with the hook claw assembly is provided on the end.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The electromagnetic coil assembly drives the claw assembly to grab the end, so as to achieve the purpose of providing a large grabbing force with a small electromagnetic force, preventing the control rod assembly under the end from falling off during vibration, and the operation is reliable;

[0020] 2. Automatic centering connection between the electromagnet device and the control rod assembly is achieved through the guide cylinder;

[0021] 3. By setting the reset spring, it is ensured that the control rod assembly can be quickly disengaged and released in the event of power failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the electromagnet device for the control rod drive mechanism of a pool-type low-temperature reactor of the present invention (grasping state).

[0023] Figure 2 It is a structural schematic diagram of the electromagnet device for the control rod drive mechanism of a pool-type low-temperature reactor of the present invention (open state).

[0024] Figure 3 It is a schematic diagram of the distribution of rollers on the cylinder of the present invention.

[0025] Figure 4 It is a schematic diagram of the distribution of the hook claws of the present invention.

[0026] Figure 5 It is a distribution diagram of the return spring of the present invention.

[0027] In the above drawings, 1, outer cylinder wall; 2, electromagnetic coil assembly; 3, reset spring; 4, magnetic conductive block; 5, roller; 6, push rod; 7, end; 8, hook; 9, cylinder; 10, connecting screw; 11, cable; 12, pin; 13, upper cover; 14, pin. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 and Figure 2 As shown, the present invention provides an electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor, comprising an electromagnetic coil assembly 2, a magnetic conductive block 4, a hook assembly, an end head 7 and a mandrel 6; the electromagnetic coil assembly is relatively fixedly connected to the hook assembly, and the magnetic conductive block 4 is relatively fixedly connected to the mandrel 6; the electromagnetic coil assembly 2 cooperates with the magnetic conductive block 4 to drive the mandrel 6 to act on the hook assembly so that the hook of the hook assembly grabs / releases the end head 7. A stop step is provided on the end head 7 to cooperate with the hook assembly.

[0030] like Figure 1 and Figure 4As shown, the hook claw assembly includes a hook claw 8 and a cylinder 9; the hook claw 8 is connected to the electromagnetic coil assembly 2 through a pin shaft 12 and can rotate around the pin shaft 12 to grasp / release the terminal 7. (In this embodiment, the electromagnetic coil assembly 2 is fixedly connected to the cylinder 9 through a connecting screw 10, and its cable 11 extends from above and the hook claw 8 is installed on the cylinder 9 through the pin shaft 12.) The top rod 6 is provided with upper teeth that cooperate with the hook claw 8 to drive the hook claw 8 to rotate. The top rod 6 is also provided with lower teeth, and the hook claw 8 is provided with a lower conical surface that cooperates with the lower teeth; when the hook claw 8 releases the terminal 7, the lower teeth abut against the lower conical surface to prevent the hook claw 8 from rotating, that is, the hook claw 8 is in a state as shown in the figure. Figure 2 In the open state shown, the lower teeth of the mandrel 6 fit with the lower conical surface of the claw 8 to limit its reverse rotation, thereby avoiding damage to the equipment during the process of re-grasping the control rod. The end of the claw 8 is provided with an upper conical surface; when the mandrel 6 rises, the upper teeth act on the upper conical surface to push the claw 8 to rotate and grasp the end 7.

[0031] The electromagnet device for the control rod drive mechanism of the pool-type low-temperature reactor of this embodiment also includes an outer cylinder wall 1; the cylinder body 9 is arranged inside the outer cylinder wall 1 and can move along the outer cylinder wall 1; the cylinder body 9 is provided with a centering hole for the top rod 6 to pass through; the size of the cylinder body 9 matches the size of the outer cylinder wall 1. The cylinder body 9 is also provided with rollers 5 that facilitate the movement of the cylinder body 9. The number of the rollers is 2-4, and they are evenly arranged around the cylinder body 9. Figure 3 As shown, the roller 5 is installed through the pin 14, and the cylinder 9 is provided with an upper cover 13. When the driving mechanism electromagnet device installs the cylinder 9 into the outer cylinder wall 1 from the top, the roller 5 slides along the inner wall of the outer cylinder wall, and the end 7 connected to the control rod assembly is automatically centered. When the electromagnet device and the stop step of the end 7 coincide, the electromagnet device can realize the grasping function by powering on. The stop step allows the electromagnet device and the end 7 to fit in place to prevent the claw 8 from failing to grasp the end 7.

[0032] like Figure 5 As shown, a return spring 3 is arranged between the magnetic conductive block 4 and the electromagnetic coil assembly 2. The number of the return springs 3 is 1-4, and they are arranged on the central axis or the pitch circle of the magnetic conductive block 4.

[0033] When in use, the electromagnetic coil assembly 2 is powered on, the magnetic block 4 is attracted and fits with the lower surface of the electromagnetic coil assembly 2, and the reset spring 3 is compressed, driving the central push rod to move, and the upper teeth of the push rod close the hook 8 to firmly grasp the end 7, thereby driving the control rod assembly to move up and down or maintain a fixed position. The electromagnetic coil assembly 2 of the electromagnet device is powered off, and the magnetic block 4 is pushed open under the action of the spring force, thereby driving the central push rod to move downward, and under the action of the deadweight of the end 7 and the lower teeth of the push rod, the hook 8 opens to release the control rod assembly.

[0034] In this embodiment, the hook 8 can be opened without external force intervention in the case of power failure, so as to realize the rapid rod drop function of the control rod drive mechanism. The spring has high working reliability, thereby also improving the reliability of the rapid rod drop function of the control rod drive mechanism.

[0035] The working environment medium of the electromagnet device is water, and the electrical component is only the electromagnetic coil. The coil is sealed in the closed space of the electromagnetic component, and only the external wire of the electromagnetic coil needs to be led out, which reduces the work of underwater sealing of the coil.

[0036] In this embodiment, the electromagnetic coil assembly 2 drives the hook assembly to grab the end head 7, so as to achieve the purpose of providing a large grabbing force with a small electromagnetic force, preventing the control rod assembly under the end head 7 from falling off during vibration, and the operation is reliable; the guide cylinder is used to realize the automatic centering connection between the electromagnet device and the control rod assembly; the reset spring 3 is set to ensure that the control rod assembly can be quickly disengaged and released in the event of power failure.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor, characterized in that: The invention comprises an electromagnetic coil assembly (2), a magnetic conductive block (4), a hook assembly, an end (7) connected to a control rod assembly, and a push rod (6); the electromagnetic coil assembly (2) and the hook assembly are relatively fixedly connected, and the magnetic conductive block and the push rod (6) are relatively fixedly connected; the electromagnetic coil assembly (2) cooperates with the magnetic conductive block (4) to drive the push rod (6) to act on the hook assembly; the hook assembly comprises a hook (8), The hook (8) rotates around the pin shaft (12) to grasp / release the end (7) connected to the control rod assembly; the mandrel (6) is provided with upper teeth that cooperate with the hook (8) to drive the hook (8) to rotate, and the end of the hook (8) is provided with an upper conical surface. When the mandrel (6) rises, the upper teeth act on the upper conical surface to push the hook (8) to rotate and grasp the end (7) connected to the control rod assembly; the mandrel (6) is also provided with lower teeth, and the hook (8) is provided with a lower conical surface that cooperates with the lower teeth. When the hook (8) releases the end (7) connected to the control rod assembly, the lower teeth of the mandrel (6) fit with the lower conical surface of the hook (8) to limit its reverse rotation, thereby avoiding damage to the equipment during the process of re-grasping the control rod.

2. The electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor according to claim 1, characterized in that: It also includes an outer cylinder wall (1); the hook claw assembly also includes a cylinder body (9); the cylinder body (9) is arranged inside the outer cylinder wall (1) and is movable along the outer cylinder wall (1); a centering hole for the push rod (6) to pass through is arranged on the cylinder body (9); the size of the cylinder body (9) matches the size of the outer cylinder wall (1).

3. The electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor according to claim 2, characterized in that: The cylinder (9) is also provided with a roller (5) which facilitates the movement of the cylinder (9).

4. The electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor according to claim 3, characterized in that: The number of the rollers is 2-4 and they are evenly arranged around the cylinder (9).

5. The electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor according to any one of claims 1 to 4, characterized in that: A return spring (3) is provided between the magnetic conductive block (4) and the electromagnetic coil assembly (2).

6. The electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor according to claim 5, characterized in that: The number of the return springs (3) is 1-4, and they are arranged on the central axis or pitch circle of the magnetic conductive block (4).

7. The electromagnet device for a control rod drive mechanism of a pool-type low-temperature reactor according to any one of claims 1 to 4, characterized in that: The end head (7) is provided with a stop step which cooperates with the hook claw assembly.

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