Abstract: Disclosed are a dirt suction guide device and a cleaner comprising the same. The disclosed cleaner comprises: a cleaner body for generating a suction force; a flexible hose connected to the cleaner body; an extension tube connected to the flexible hose; and a dirt suction guide device separately coupled to the extension tube, wherein the dirt suction guide device comprises a body, a movable portion, which is connected to one side of the body, and which is coupled to be able to slide with regard to the body, and a connecting portion, which is connected to the other side of the body, and which connects the body to the extension tube, and the body is hinge-coupled such that the same can selectively maintain and change an angle with regard to the extension tube.

Abstract: Provided are a heat exchange method of tap water using a heat exchanger, and the heat exchanger. The content of residual chlorine in the tap water is about 2 ppm or more, the heat exchanger comprises a plurality of heat plates, which comprise ferritic stainless steel, and copper brazing configured to couple the heat plates, and the ferritic stainless steel contains less than about 0.5 wt % of nickel, about 0.1 wt % to about 2 wt % of copper, and about 0.03 wt % or less of carbon.

Abstract: Disclosed are a dirt suction guide device and a cleaner comprising the same. The disclosed cleaner comprises: a cleaner body for generating a suction force; a flexible hose connected to the cleaner body; an extension tube connected to the flexible hose; and a dirt suction guide device separately coupled to the extension tube, wherein the dirt suction guide device comprises a body, a movable portion, which is connected to one side of the body, and which is coupled to be able to slide with regard to the body, and a connecting portion, which is connected to the other side of the body, and which connects the body to the extension tube, and the body is hinge-coupled such that the same can selectively maintain and change an angle with regard to the extension tube.

Abstract: A supporter and a vacuum cleaner having the same are provided. The supporter includes: a suction channel portion that includes one end removably connected with a vacuum cleaning unit and the other end connected with a suction nozzle, thereby guiding dirt drawn in through the suction nozzle to the vacuum cleaning unit; an accessory that is received in a receiving recess formed on one side of the suction channel portion; a hinge portion that is disposed in the suction channel portion and supports the accessory to pivot by a predetermined angle; and an unlocking portion that is disposed in the suction channel portion to lock and unlock the accessory with respect to the receiving recess.

Abstract: A supporter and a vacuum cleaner having the same are provided. The supporter includes: a suction channel portion that includes one end removably connected with a vacuum cleaning unit and the other end connected with a suction nozzle, thereby guiding dirt drawn in through the suction nozzle to the vacuum cleaning unit; an accessory that is received in a receiving recess formed on one side of the suction channel portion; a hinge portion that is disposed in the suction channel portion and supports the accessory to pivot by a predetermined angle; and an unlocking portion that is disposed in the suction channel portion to lock and unlock the accessory with respect to the receiving recess.