A remote transmission device for controlling reactor reactivity

Abstract

The present invention discloses a remote transmission control reactor reactivity device, comprising a driving mechanism, a transmission shaft and a control drum; the output shaft, the transmission shaft and the control drum of the driving mechanism are connected in sequence; an outer sleeve is arranged outside the transmission shaft; the driving mechanism and the control drum are respectively provided with outer shells, and the outer shells of the driving mechanism and the control drum are both tightly connected with the outer sleeve to form an enclosed space. The beneficial effects of the present invention are as follows: the present invention remotely controls the rotation of the control drum through a mechanical structure, thereby remotely controlling the reactor, with high reliability and the ability to avoid radiation interference. The outer sleeve of the transmission device is filled with protective gas, and the transmission components and bearings operate in an inert gas environment to ensure the reliable performance of the rotating components. The transmission rod is connected by a combination of a universal joint coupling and a spline, which can compensate for the angular deviation between the power output shaft and the control drum shaft and the axial expansion and contraction caused by temperature changes.

Description

Technical Field

[0001] The invention relates to nuclear industry machinery, in particular to a remote transmission device for controlling reactor reactivity. Background Art

[0002] The control drum of the reactor is composed of neutron absorbing material and neutron reflecting material. By rotating the control drum outside the core, the position of the neutron reflecting material and the neutron absorbing material relative to the core is changed, thereby adjusting the reactivity of the reactor.

[0003] The neutron absorbing material 2 on the control drum is positioned toward the core 3 to suppress the continuous fission state of the reactor nuclear fuel (such as Figure 1 When the neutron reflector 1 on the control drum is positioned toward the core 3, the continuous fission state of the reactor nuclear fuel is promoted (as shown in FIG. Figure 2 shown).

[0004] In order to meet the needs of long-distance control, the drive mechanism and the control drum are usually set close to each other, and the drive mechanism is controlled by wireless or wired communication. This practice is not advisable in the field of nuclear power engineering, because radiation will affect signal transmission, resulting in control failure and prone to accidents.

[0005] In view of this, in order to increase the reliability and diversity of reactor control, the present invention is proposed. Summary of the invention

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide a remote transmission device for controlling the reactivity of a reactor, which can at least provide a technical solution for directly remotely controlling a control drum through a mechanical structure to avoid accidents.

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

[0008] A remote transmission device for controlling reactor reactivity comprises a driving mechanism, a transmission shaft and a control drum; the output shaft of the driving mechanism, the transmission shaft and the control drum are connected in sequence; an outer sleeve is arranged outside the transmission shaft; the driving mechanism and the control drum are respectively provided with outer shells, and the outer shells of the driving mechanism and the control drum are both tightly connected with the outer sleeve to form a closed space.

[0009] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, the outer shell of the driving mechanism and the outer shell of the control drum are respectively connected to the outer sleeve in a sealed manner through fixing flanges.

[0010] Furthermore, in the above-mentioned remote transmission device for controlling reactor reactivity, a bearing is provided on the fixed flange to facilitate the rotation of the transmission shaft or the input shaft of the control drum.

[0011] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, a universal joint is arranged on the input shaft of the transmission shaft or the control drum; and a universal hinge-type expansion joint is arranged on the portion of the outer sleeve or the outer shell of the control drum corresponding to the universal joint.

[0012] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, there are two universal joints, which are respectively arranged on the transmission shaft and the input shaft of the control drum.

[0013] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, the input shaft of the control drum extends into the outer sleeve, and the universal joint on the input shaft of the control drum is located inside the outer sleeve.

[0014] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, the universal hinge type expansion joint includes a bellows, a hinge ring and a connecting piece; the two ends of the bellows are respectively connected with connecting pieces; the connecting pieces at both ends of the bellows are simultaneously hinged on the same hinge ring.

[0015] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, the output shaft of the driving mechanism and the transmission shaft, and the transmission shaft and the input shaft of the control drum are connected by spline means.

[0016] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, an axial telescopic expansion joint is also provided on the outer sleeve.

[0017] Furthermore, in the above-mentioned remote transmission control reactor reactivity device, the enclosed space is filled with inert gas.

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

[0019] 1. The present invention remotely controls the rotation of the control drum through a mechanical structure, thereby remotely controlling the reactor, has high reliability, and can avoid radiation interference.

[0020] 2. The outer sleeve of the transmission device is filled with protective gas, and the transmission parts and bearings operate in an inert gas environment to ensure the reliable performance of the rotating parts;

[0021] 3. The transmission rod is connected by a combination of universal joint coupling and spline, which can compensate for the angular deviation between the power output shaft and the control drum shaft and the axial expansion and contraction caused by temperature changes;

[0022] 4. The outer sleeve is connected by a combination of a universal hinge expansion joint and an axial telescopic expansion joint, which can compensate for the angular deviation between the outer shell of the drive mechanism and the outer shell of the control drum and the axial expansion and contraction caused by temperature changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Diagram of the core layout to suppress the continued fission state of the reactor's nuclear fuel.

[0024] Figure 2 Diagram of the core layout to promote the continued fission state of the reactor's nuclear fuel.

[0025] Figure 3 It is a schematic structural diagram of the remote transmission control reactor reactivity device of the present invention.

[0026] Figure 4 It is a structural schematic diagram of a universal hinge type expansion joint.

[0027] In the above drawings, 1. neutron reflecting material; 2. neutron absorbing material; 3. core; 4. shell; 5. output shaft; 6. bearing; 7. universal joint; 8. outer sleeve; 9. axial telescopic expansion joint; 10. universal hinge type expansion joint; 11. fixed flange; 12. control drum; 13. shell; 14. bearing; 15. universal joint; 16. spline; 17. transmission shaft; 18. universal hinge type expansion joint; 19. fixed flange; 20. spline. DETAILED DESCRIPTION

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

[0029] like Figure 3 As shown, the present invention provides a remote transmission control reactor reactivity device, including a driving mechanism, a transmission shaft 17 and a control drum 12; the output shaft 5 of the driving mechanism, the transmission shaft 17 and the control drum 12 are connected in sequence; an outer sleeve 8 is provided outside the transmission shaft 17; the driving mechanism and the control drum 12 are respectively provided with outer shells, and the outer shells of the driving mechanism and the control drum 12 are both tightly connected with the outer sleeve 8 to form a closed space. The closed space is filled with inert gas, so that the transmission components and bearings operate in an inert gas environment, ensuring the reliable performance of the rotating components.

[0030] The housing of the drive mechanism and the housing of the control drum 12 are respectively connected to the outer sleeve 8 through fixed flanges (11, 19). The fixed flanges (11, 19) are provided with bearings (6, 14) for facilitating the rotation of the transmission shaft 17 or the input shaft of the control drum 12.

[0031] A universal joint (7, 15) is provided on the input shaft of the transmission shaft 17 or the control drum 12; a universal hinge type expansion joint is provided on the portion of the outer sleeve 8 or the outer shell of the control drum 12 corresponding to the universal joint. In this embodiment, there are two universal joints, which are respectively provided on the transmission shaft 17 and the input shaft of the control drum 12. The angular deviation between the output shaft 5 of the drive mechanism and the axis of the control drum 12 is compensated by the universal joint 7 and the universal joint 15. The universal hinge type expansion joint 18 and the universal hinge type expansion joint 10 allow the generation of rotation angles and limit axial expansion and contraction. The outline diagram of the universal hinge type expansion joint 10 is shown in FIG. Figure 4 The axial telescopic expansion joint 9 allows axial telescopic expansion and limits angular deflection.

[0032] In this embodiment, the input shaft of the control drum 12 extends into the outer sleeve 8, and the universal joint 15 on the input shaft of the control drum 12 is located in the outer sleeve 8. In this way, two universal hinge-type expansion joints are both arranged on the outer sleeve 8, which facilitates the processing and assembly of the overall structure.

[0033] like Figure 4 As shown, the universal hinge type expansion joint includes a bellows, a hinge ring and a connector; the two ends of the bellows are respectively connected to the connectors; the connectors at both ends of the bellows are simultaneously hinged on the same hinge ring. In this way, the structures respectively connected to the two ends of the bellows can obtain partial support through the connection between the connector and the hinge ring, so that the bellows maintains a moderate length. At the same time, the hinge between the two connectors and the hinge ring can ensure that the radial bending of the bellows is not affected, which is convenient for the universal joint to compensate for the angle deviation.

[0034] The output shaft 5 of the drive mechanism and the transmission shaft 17, as well as the transmission shaft 17 and the input shaft of the control drum 12 are connected by splines to compensate for the axial distance deviation between the output shaft 5 and the control drum 12. An axial telescopic expansion joint 9 is also provided on the outer sleeve 8 to compensate for the axial distance deviation between the housing 4 of the drive mechanism and the housing 13 of the control drum.

[0035] The output torque of the drive mechanism is transmitted to the control drum 12 through the drive mechanism output shaft 5, spline 20, universal joint 7, transmission shaft 17, spline 16, universal joint 15 in sequence, so as to realize the rotation angle control of the control drum 12. The weight of the rotating parts such as spline, transmission shaft 17 and universal joint is borne by bearing 6 and bearing 14. The weight of the housing (4, 13) and expansion joint (7, 14) is borne by fixing flange 19 and fixing flange 11.

[0036] The present invention remotely controls the rotation of the control drum 12 through a mechanical structure, thereby remotely controlling the reactor, with high reliability and the ability to avoid radiation interference. The outer sleeve 8 of the transmission device is filled with protective gas, and the transmission components and bearings operate in an inert gas environment to ensure the reliable performance of the rotating components; the transmission rod is connected by a combination of a universal joint and a spline, which can compensate for the angular deviation between the power output shaft 5 and the control drum shaft and the axial expansion and contraction caused by temperature changes; the outer sleeve 8 is connected by a combination of a universal hinge expansion joint and an axial expansion expansion joint, which can compensate for the angular deviation between the housing 4 of the drive mechanism and the housing 13 of the control drum and the axial expansion and contraction caused by temperature changes.

[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. A remote transmission device for controlling reactor reactivity, characterized in that: It includes a driving mechanism, a transmission shaft and a control drum; the output shaft of the driving mechanism, the transmission shaft and the control drum are connected in sequence; an outer sleeve is arranged outside the transmission shaft; the driving mechanism and the control drum are respectively provided with outer shells, and the outer shells of the driving mechanism and the control drum are both tightly connected with the outer sleeve to form a closed space; universal joints are arranged on the input shafts of the transmission shaft and the control drum, the input shaft of the control drum extends into the outer sleeve, and the universal joint on the input shaft of the control drum is located in the outer sleeve; two universal hinge-type expansion joints are arranged on the part of the outer sleeve corresponding to the universal joint, so as to facilitate the processing and assembly of the overall structure; the universal hinge The expansion joint comprises a bellows, a hinge ring and a connecting piece. The universal hinge type expansion joint allows rotation and limits axial expansion and contraction. The two ends of the bellows are respectively connected with connecting pieces. The connecting pieces at both ends of the bellows are hinged on the same hinge ring at the same time. The structures respectively connected to the two ends of the bellows can obtain partial support through the connection between the connecting piece and the hinge ring, so that the bellows maintains an appropriate length. At the same time, the hinge between the two connecting pieces and the hinge ring can ensure that the radial bending of the bellows is not affected, which is convenient for the universal joint to compensate for the angular deviation. The outer sleeve is also provided with an axial expansion joint, which allows axial expansion and contraction and limits angular deflection.

2. The remote transmission control reactor reactivity device according to claim 1, characterized in that: The outer shell of the driving mechanism and the outer shell of the control drum are respectively connected to the outer sleeve in a sealed manner through fixing flanges.

3. The remote transmission control reactor reactivity device according to claim 2, characterized in that: The fixed flange is provided with a bearing for facilitating the rotation of the transmission shaft or the input shaft of the control drum.

4. The remote transmission control reactor reactivity device according to any one of claims 1 to 3, characterized in that: The output shaft of the driving mechanism and the transmission shaft, as well as the transmission shaft and the input shaft of the control drum are connected via splines.

5. The remote transmission control reactor reactivity device according to any one of claims 1 to 3, characterized in that: The enclosed space is filled with inert gas.

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