CN201669514U

CN201669514U - Seal-weld filling ring of control rod driving mechanism

Info

Publication number: CN201669514U
Application number: CN2010201933183U
Authority: CN
Inventors: 沈祖兴; 殷文华; 朱国稳
Original assignee: SHANGHAI TIANHE ELECTROMECHANICAL CO Ltd
Current assignee: SHANGHAI TIANHE ELECTROMECHANICAL CO Ltd
Priority date: 2010-05-14
Filing date: 2010-05-14
Publication date: 2010-12-15
Anticipated expiration: 2020-05-14

Abstract

The utility model discloses a seal-weld filling ring of a control rod driving mechanism, the cross-section shape of the filling ring is rectangle. The filling ring comprises an upper surface and a lower surface, a circle of locating flanges are arranged at the edge of inner circle of the upper surface, the lower surface is opened with a plurality of argon grooves. Through the seal-weld filling ring of the control rod driving mechanism, the back of weld joint can be protected completely during the course of automatic argon arc welding, thereby the welding quality is ensured.

Description

CRDM seal-weld ring type filling

Technical field

The utility model relates to a kind of nuclear power station reactor control stick driving mechanism, particularly a kind of CRDM seal-weld ring type filling.

Background technology

CRDM (control rod drive mechanism; be called for short CRDM) be a kind of servo control mechanism of nuclear power plant reactor control system and safety system; it is the important action component of nuclear reactor safety; by its action; drive the control rod assembly and pull and push up and down, with startup, power adjusting, the shutdown work of realization response heap at reactor core.It is used for conditioned reaction heap power when normal operation, introduce negative reactivity under accident conditions fast, makes the reactor emergency shut-down, guarantees nuclear safety.Therefore, its performance quality directly influences the normal operation and the safety of nuclear power station.

Fig. 1 is the schematic diagram of CRDM, Fig. 2 is the local enlarged diagram in E zone among Fig. 1, Fig. 3 is the local enlarged diagram in F zone among Fig. 1, shown in Fig. 1～3, CRDM comprises drive rod stroke thimble assembly 1, capsul assembly 2 and CRDM base 3, at the upper and lower side of capsul assembly 2 and the junction of drive rod stroke thimble assembly 1 and CRDM base 3 twice Ω shape seal-weld 100,200 is arranged, need to adopt the method that adds ring type filling to carry out remote argonaut welding and connect.Capsul assembly 2 is pressure-bearing boundaries, and it is excessive that the breakage of this pressure-bearing boundary will produce radioactive cooling agent, the Ω shape seal-weld the 100, the 200th of this assembly, the important content of quality assurance.Therefore the quality requirement to welding is very high.

Fig. 2 shows two kinds of different bevel for weldings respectively with Fig. 3, the bevel for welding of the drive rod stroke thimble assembly 1 among Fig. 2 and the seal-weld 100 of capsul assembly 2 is a single V groove with root face, and the bevel for welding of the seal-weld 200 of capsul assembly 2 and CRDM base 3 is an I shape groove among Fig. 3.The ring type filling of available technology adopting generally adopts welding wire to curve ring-type; when carrying out argonaut welding and connect, ring type filling is placed bevel for welding; and the protective gas argon gas of argonaut welding when connecing generally carried in the welding torch back; therefore when welding; protective gas can be filled loop resistance retaining and can't be input to the inside of Ω shape seal-weld 100,200; cause the front and back of seal-weld 100,200 that notable difference is arranged, or even welding quality does not reach requirement.

The utility model content

For addressing the above problem, the utility model provides a kind of CRDM seal-weld ring type filling, guarantees that the front and back of seal-weld is protected the protection of gas simultaneously.

For achieving the above object, CRDM seal-weld ring type filling of the present utility model, the cross sectional shape of this ring type filling is a rectangle, this ring type filling comprises upper surface and lower surface, the inner ring edge of described upper surface is provided with a delineation position flange, offers a plurality of argon gas grooves on the described lower surface.

As preferably, described a plurality of argon gas grooves evenly distribute.

As preferably, described argon gas groove and the angle that radially is 30 °～45 °.

As preferably, offer a plurality of argon gas grooves on the described upper surface.

By CRDM seal-weld ring type filling of the present utility model, can in the argonaut welding termination process, carry out complete argon shield in the butt welded seam back side, guaranteed welding quality.

Description of drawings

Fig. 1 is the schematic diagram of CRDM;

Fig. 2 is the local enlarged diagram in E zone among Fig. 1;

Fig. 3 is the local enlarged diagram in F zone among Fig. 1;

Fig. 4 is the schematic diagram of the preferred embodiment of ring type filling of the present utility model;

Fig. 5 for for the B-B of ring type filling among Fig. 4 to cutaway view Amplified image;

Fig. 6 places the schematic diagram of the seal-weld bevel for welding of capsul assembly and CRDM base for ring type filling among Fig. 4.

The specific embodiment

Fig. 4 is the schematic diagram of the preferred embodiment of ring type filling of the present utility model, and Fig. 5 is that the B-B of ring type filling among Fig. 4 is to cutaway view Amplified image.Figure 4 and 5 are depicted as a preferred embodiment of ring type filling of the present utility model, the cross sectional shape of the ring type filling 20 of this embodiment is a rectangle, it comprises upper surface 21 and lower surface 23, the inner ring edge of described upper surface 21 is provided with a delineation position flange 22, have a plurality of argon gas grooves 24 on the described lower surface 23, described a plurality of argon gas grooves 24 preferably evenly distribute.Because when welding, welding torch rotates around CRDM, therefore, preferably, described argon gas groove 24 and angle β radially are 30 °～45 °, and the yawing moment of argon gas groove 24 is consistent around the direction that CRDM rotates with welding torch, is convenient to argon gas and conveniently enters the Ω shape seal-weld back side.Also can offer a plurality of argon gas grooves on the described upper surface 21, make things convenient for argon gas to enter the Ω shape seal-weld back side.

Fig. 6 places the schematic diagram of the seal-weld bevel for welding of capsul assembly 2 and CRDM base 3 for ring type filling 20 among Fig. 4; as shown in the figure; the upper surface 21 and the lower surface 23 of ring type filling 20 are close to the seal-weld bevel for welding; the locating flange 22 of upper surface 21 is by positioning with cooperating of capsul assembly 2; connect when welding carrying out argonaut welding; the protective gas argon gas can enter the Ω shape seal-weld back side by the argon gas groove 24 on the lower surface 23, guarantees the welding quality of back of weld.

CRDM seal-weld ring type filling of the present utility model is applicable to that bevel for welding is the groove type of I shape groove, certainly, bevel for welding form difference according to CRDM seal-weld, CRDM seal-weld ring type filling of the present utility model can be designed to different cross sectional shapes, and offers the argon gas groove on corresponding surface.Bevel for welding as shown in Figure 2 is the groove type of single V groove with root face, and its cross section can be designed to trapezoidal.

Claims

1. CRDM seal-weld ring type filling, it is characterized in that the cross sectional shape of this ring type filling is a rectangle, this ring type filling comprises upper surface and lower surface, the inner ring edge of described upper surface is provided with a delineation position flange, offers a plurality of argon gas grooves on the described lower surface.

2. CRDM seal-weld ring type filling as claimed in claim 1 is characterized in that, described a plurality of argon gas grooves evenly distribute.

3. CRDM seal-weld ring type filling as claimed in claim 1 is characterized in that, described argon gas groove and the angle that radially is 30 °～45 °.

4. CRDM seal-weld ring type filling as claimed in claim 1 is characterized in that, offers a plurality of argon gas grooves on the described upper surface.