Internal combustion type hot blast stove vault steel shell structure and internal combustion type hot blast stove

The invention discloses an internal combustion type hot blast stove vault steel shell structure and an internal combustion type hot blast stove, and the internal combustion type hot blast stove vault steel shell structure comprises a shell top section, a middle section and a shell bottom section; the shell top section is of a semi-closed structure with a downward opening; a case bottom section; and two ends of the middle section are respectively connected with the shell top section and the shell bottom section, and the middle section is in smooth transition with the joint of the shell top section and the shell bottom section. According to the arch crown steel shell structure of the internal combustion type hot blast stove, the connecting positions of the middle section, the shell top section and the shell bottom section are in smooth transition, stress concentration of inflection points of the connecting positions is eliminated, intergranular stress corrosion caused by the stress effect of the arch crown stee