Abstract: Provided is a pipe connection device. The pipe connection device includes an adapter including a hollow pipe and a ring-shaped protruding end extending in the diameter direction of the hollow pipe from one end of the hollow pipe in the longitudinal direction, a ring flange formed in a ring shape and mounted so as to surround the outer circumferential surface of the protruding end and to be axially rotatable about a central axis of the hollow pipe in the longitudinal direction but not to be movable in the longitudinal direction of the hollow pipe, and a fastening unit configured to join two different ring flanges to each other in a stacked structure so that one end of one of two different hollow pipes in the longitudinal direction and one end of the remaining one of the two different hollow pipes in the longitudinal direction are forcibly secured to each other.

Abstract: Disclosed is a refrigerator having a height-adjustable door. The body of the refrigerator has at least one storage space having a front opening. The door is coupled to the body so as to cover/uncover the storage space, and a hinge hole is formed on the bottom surface of the door. A hinge frame is fixed to a front surface of a lower portion of the body and has a hinge shaft inserted into the hinge hole so as to rotatably support the door. The hinge shaft is covered with a hinge bush, a part of which is inserted into the hinge hole. The hinge bush has a flange portion on its lower end for supporting the bottom surface of the door. A height adjustment screw is screw-coupled to a screw hole of the hinge frame so as to travel vertically. The upper end of the height adjustment screw abuts the bottom surface of the hinge bush so that, when rotated, the height adjustment screw lifts/lowers the hinge bush, in order to adjust the height of the door.