Arc extinguish chamber and valve-side circuit breaker for flexible direct current system using arc extinguish chamber

The invention relates to the field of electrical switches, in particular to an arc extinguish chamber and a flexible direct current system valve side circuit breaker using the arc extinguish chamber. The arc extinguish chamber comprises an arc extinguish chamber sleeve and a moving contact assembly installed in the arc extinguish chamber sleeve through a moving contact seat, the moving contact assembly comprises a pull rod and a moving contact, the inner end of the moving contact seat extends towards the moving contact, and the inner end of the moving contact seat extends towards the moving contact between the moving contact seat and the pull rod. And guide structures are respectively arranged between the moving contact seat and the moving contact. According to the invention, the moving contact assembly can be guided from the two ends of the moving contact assembly, so that multi-point reliable guiding of the moving contact assembly is realized while the contact area of the guiding structure and the moving co