Gas conveying structure and nitrogen blowing concentrator

The utility model discloses a gas delivery structure and a nitrogen blowing concentrator, the gas delivery structure comprises a first gas guide plate and a plurality of first gas guide pieces, the first gas guide plate is provided with a plurality of first gas holes, the first gas guide pieces are provided with first gas channels, the first gas guide plate is detachably connected with the first gas guide pieces, and the first gas holes are communicated with the first gas channels. The first air holes are in one-to-one correspondence with the first gas channels, and one end of each first gas channel is communicated with one end of the corresponding first air hole. According to the scheme, gas can be introduced into the other end of the first gas hole, then the gas enters the first gas channel through one end of the first gas hole, and then the gas is conveyed to the gas blowing needle. By arranging the detachable first air guide plate and the first air guide piece, a user can replace the first air guide piece