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Mounting method of spacer bush in motor type CRDM (Control Rod Drive Mechanism)

A technology of CRDM and installation method, which is applied in the field of installation of spacers in motor-type CRDMs, and can solve problems such as damage to spacers or other parts, high difficulty in assembly, and difficulty in aligning spacers and upper channels of motor-type CRDMs.

Active Publication Date: 2018-11-27
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned difficulties in centering the spacer and the upper channel of the motor-type CRDM, the problems of high assembly difficulty, low assembly efficiency, and easy damage to the spacer or other parts, the present invention provides a motor-type CRDM The installation method of the spacer sleeve, this installation method is easy to operate, not only can ensure the installation accuracy of the spacer sleeve, but also can improve the installation efficiency of the spacer sleeve

Method used

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  • Mounting method of spacer bush in motor type CRDM (Control Rod Drive Mechanism)
  • Mounting method of spacer bush in motor type CRDM (Control Rod Drive Mechanism)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for installing a spacer in a motor-type CRDM, the installation method is used to realize the assembly of a spacer 4 in a motor-type CRDM, and the method includes the following steps in sequence:

[0049] S1. Before the spacer 4 is inserted into the upper channel of the motor-type CRDM, a cylindrical first mandrel is inserted into the spacer 4, and the relationship between the outer diameter of the first mandrel and the inner diameter of the through hole on the spacer 4 is: : the outer diameter of the first mandrel is greater than or equal to the inner diameter of the through hole on the spacer 4 to obtain a combination consisting of the spacer 4 and the first mandrel;

[0050] S2. The assembly is introduced into the tunnel through the opening of the tunnel, and after the spacer 4 passes through the installation area of ​​the motor-type CRDM stator component, the spacer 4 is fixed on the end cover 5 of the motor-type CRDM or the machine base 1 on;

[0051] S3. ...

Embodiment 2

[0058] This embodiment is further limited on the basis of Embodiment 1: as a specific implementation of step S2, in step S2, the assembly is introduced into the channel through the bottom opening of the motor-type CRDM, and the bottom opening is the completion of the electric motor. After the model CRDM is connected to the pressure-resistant shell, the motor-type CRDM is close to the orifice at one end of the pressure vessel;

[0059] After the spacer 4 passes through the installation area of ​​the motor-type CRDM stator component, the end of the spacer 4 that penetrates into the tunnel is welded to the machine base 1 at the position of the upper step surface of the tunnel;

[0060] After step S3 is completed, the other end of the spacer 4 is welded to the end cover 5 . In the prior art, the motor-type CRDM base 1 is generally a stepped through hole, and the stepped through hole has a stepped surface, and the stator winding 2 included in the stator component is installed in th...

Embodiment 3

[0079] This embodiment is further limited on the basis of the technical solution provided in Embodiment 1: After the motor-type CRDM is assembled, it needs to be installed on the pressure vessel by hoisting, and at the same time, the pressure shell needs to be embedded in the compartment In the center hole of sleeve 4, in order to avoid the alignment problem between the upper end of the pressure shell and the lower end of the motor-type CRDM, the impact between the spacer 4 and the pressure shell will cause damage to the spacer 4 or require a long alignment time, the setting is: The spacer 4 is composed of an equal-diameter straight pipe section and a variable-diameter section. The variable-diameter section is bell-shaped, and the smaller-diameter end of the variable-diameter section is connected to the end of the equal-diameter straight pipe section. In step S2, the spacer The end of the end where the straight pipe section of the sleeve 4 is located is first introduced into th...

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Abstract

The invention discloses a mounting method of a spacer bush in a motor type CRDM (Control Rod Drive Mechanism). The mounting method is used for assembling the spacer bush in the motor type CRDM. The method comprises the following steps which are carried out in sequence: S1, before inserting the spacer bush into a pore channel in the motor type CRDM, inserting a cylindrical first core rod into the spacer bush, so as to obtain a combined body of the spacer bush and the first core rod; S2, introducing the combined body into the pore channel from a pore opening of the pore channel; after the spacerbush penetrates through a stator part mounting region of the motor type CRDM, fixing the spacer bush on an end cover or an engine base of the motor type CRDM; S3, applying a force for pulling the first core rod away from the spacer bush to the first core rod, so as to realize separation of the first core rod and the spacer bush. The mounting method is simple to operate, and the mounting precisionof the spacer bush can be ensured; and meanwhile, the mounting efficiency of the spacer bush can be improved.

Description

technical field [0001] The invention relates to the technical field of control rod drive mechanisms, in particular to a method for installing a spacer sleeve in a motor-type CRDM. Background technique [0002] CRDM is the abbreviation of "Control Rod Drive Mechanism". It is the servo mechanism of the reactor control and protection system. And make it quickly inserted into the core, and then complete the functions of starting the reactor, adjusting power, maintaining power, normal shutdown and accident shutdown. [0003] At present, most of the CRDMs in marine nuclear power reactors are motor-type CRDMs. The motor-type CRDMs have the disadvantages of high failure rate and inconvenient use. : A technical scheme of shielded motor-type CRDM, which includes a technical feature spacer, which is actually a shielding sleeve that plays a shielding role. Various complex problems caused by mildew of electrical materials provide strong guarantees for the reliable operation of the reac...

Claims

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Application Information

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IPC IPC(8): G21C13/028G21C13/032
CPCG21C13/0285G21C13/032Y02E30/30
Inventor 荆晶刘茂福黄朝辉李亚奇叶林
Owner NUCLEAR POWER INSTITUTE OF CHINA