A compressor, comprising: a compressor body comprising a housing and a compression assembly disposed in the housing, a compression cavity being defined by the compression assembly and having an air suction port, and a guide pipe being disposed at the housing; a reservoir comprising a suction pipe; and a connection pipe disposed in the guide pipe, a first end of the connection pipe being connected to the air suction port, and the suction pipe being disposed in the connection pipe and connected to a second end of the connection pipe, wherein: the connection pipe is a copper pipe; and each of the suction pipe and the guide pipe is a steel pipe, wherein: the connection pipe comprises a position limit section, an inner surface of the connection pipe is spaced apart from an outer surface of the suction pipe to form a first welding gap; and an outer surface of the connection pipe is spaced apart from an inner surface of the guide pipe to form a second welding gap, characterized in that a width of the first welding gap is smaller than a width of the second welding gap, the connection pipe comprises a flare section, the flare section extending from the position limit section in a direction facing away from the compressor body; and the first welding gap comprises a first sub-gap formed between an inner surface of the position limit section and the outer surface of the suction pipe, and a second sub-gap formed between an inner surface of the flare section and the outer surface of the suction pipe, a width of the first sub-gap being smaller than a width of the second sub-gap. a compressor body comprising a housing and a compression assembly disposed in the housing, a compression cavity being defined by the compression assembly and having an air suction port, and a guide pipe being disposed at the housing; a reservoir comprising a suction pipe; and a connection pipe disposed in the guide pipe, a first end of the connection pipe being connected to the air suction port, and the suction pipe being disposed in the connection pipe and connected to a second end of the connection pipe, wherein: the connection pipe is a copper pipe; and each of the suction pipe and the guide pipe is a steel pipe, wherein: the connection pipe comprises a position limit section, an inner surface of the connection pipe is spaced apart from an outer surface of the suction pipe to form a first welding gap; and an outer surface of the connection pipe is spaced apart from an inner surface of the guide pipe to form a second welding gap, characterized in that a width of the first welding gap is smaller than a width of the second welding gap, the connection pipe comprises a flare section, the flare section extending from the position limit section in a direction facing away from the compressor body; and the first welding gap comprises a first sub-gap formed between an inner surface of the position limit section and the outer surface of the suction pipe, and a second sub-gap formed between an inner surface of the flare section and the outer surface of the suction pipe, a width of the first sub-gap being smaller than a width of the second sub-gap. the connection pipe is a copper pipe; and each of the suction pipe and the guide pipe is a steel pipe, wherein: the connection pipe comprises a position limit section, an inner surface of the connection pipe is spaced apart from an outer surface of the suction pipe to form a first welding gap; and an outer surface of the connection pipe is spaced apart from an inner surface of the guide pipe to form a second welding gap, characterized in that a width of the first welding gap is smaller than a width of the second welding gap, the connection pipe comprises a flare section, the flare section extending from the position limit section in a direction facing away from the compressor body; and the first welding gap comprises a first sub-gap formed between an inner surface of the position limit section and the outer surface of the suction pipe, and a second sub-gap formed between an inner surface of the flare section and the outer surface of the suction pipe, a width of the first sub-gap being smaller than a width of the second sub-gap.