Mounting structure for electric heating tub, electric heating tube type boiler, and electric steam generator

An electric heating tube boiler, comprising a mounting structure for an electric heating tube, wherein the mounting structure comprises a tube plate, an electric heating tube body, a first cylinder part and a second cylinder part, wherein the tube plate is defined with a through hole, the through hole comprises a first circular hole part, a conical hole part and a second circular hole part, the conical hole part is connected with the first circular hole part and the second circular hole part, and a wide-caliber end of the conical hole part is connected with the first circular hole part, and a narrow-caliber end of the conical hole part is connected with the second circular hole part, and the first cylinder part is connected with the second cylinder part, an inner wall surface of the first cylinder part and an inner wall surface of the second cylinder part are located on a same cylindrical surface, and an outer wall surface of the first cylinder part is cylindrical in shape, an outer wall surface of the second cylinder part is frustum-shaped, the outer wall surface of the second cylinder part is configured to be tightly attached to the conical hole part;

• an outer wall of the first cylinder part is provided with threads, and a hole wall of the first circular hole part is provided with threads;
• an outer transition ring groove is provided between the outer wall surface of the first cylinder part and the outer wall surface of the second cylinder part, and an inner transition ring groove is provided between an inner wall surface of the first cylinder part and an inner wall surface of the second cylinder part, and the outer transition ring groove and the inner transition ring groove are located in a same plane;
• and
• the electric heating tube body is clamped in the first cylinder part and the second cylinder part, when the first cylinder part is screwed into the first circular hole part, the conical hole part squeezes the second cylinder part, and the second cylinder part breaks off from the first cylinder part, and the second cylinder part is squeezed and deformed to clamp the electric heating tube body.

An electric steam generator, comprising a mounting structure for an electric heating tube, wherein the mounting structure comprises a tube plate, an electric heating tube body, a first cylinder part and a second cylinder part, wherein the tube plate is defined with a through hole, the through hole comprises a first circular hole part, a conical hole part and a second circular hole part, the conical hole part is connected with the first circular hole part and the second circular hole part, and a wide-caliber end of the conical hole part is connected with the first circular hole part, and a narrow-caliber end of the conical hole part is connected with the second circular hole part, and the first cylinder part is connected with the second cylinder part, an inner wall surface of the first cylinder part and an inner wall surface of the second cylinder part are located on a same cylindrical surface, and an outer wall surface of the first cylinder part is cylindrical in shape, an outer wall surface of the second cylinder part is frustum-shaped, the outer wall surface of the second cylinder part is configured to be tightly attached to the conical hole part;

• an outer wall of the first cylinder part is provided with threads, and a hole wall of the first circular hole part is provided with threads;
• an outer transition ring groove is provided between the outer wall surface of the first cylinder part and the outer wall surface of the second cylinder part, and an inner transition ring groove is provided between an inner wall surface of the first cylinder part and an inner wall surface of the second cylinder part, and the outer transition ring groove and the inner transition ring groove are located in a same plane;
• and
• the electric heating tube body is clamped in the first cylinder part and the second cylinder part, when the first cylinder part is screwed into the first circular hole part, the conical hole part squeezes the second cylinder part, and the second cylinder part breaks off from the first cylinder part, and the second cylinder part is squeezed and deformed to clamp the electric heating tube body.