An improved coupling system for joining two items together, typically in the form of copper pipes, to other copper pipes, or in the form of other fittings, includes a pair of flange couplings, each of which is independently secured to one of the items to be joined together so that when the two flange couplings are securely joined to each other by suitable fasteners received through fastening apertures in the two flange couplings, the two items are sealingly joined to one another to form a substantially water tight junction. The improvement being that the bare metal parts of the ferrous components of the coupling are coated with a protective coating, such as a copper coating, so that there is no direct contact between two dissimilar metals thereby inhibiting or preventing corrosion of the metal components of the coupling due to electrolytic or galvanic action arising from direct contact between the two dissimilar metals.

A heat exchanger includes a tube expansion portion formed by expanding a heat transfer tube so that an outer peripheral surface of the heat transfer tube is pressed against an inner peripheral surface of a hole provided in a side wall portion of a case. The tube expansion portion includes first and second bulge portions positioned respectively on the inside and the outside of the side wall portion so as to sandwich the side wall portion in an axial length direction of the heat transfer tube and configured such that respective outer peripheral surfaces thereof partially bulge outward in a radial direction of the heat transfer tube, an end portion tip end of the heat transfer tube is positioned apart from the second bulge portion, and the end portion tip end and a part in the vicinity thereof are expanded so as to be included in a part of the tube expansion portion. Thus, effects such as improving the precision with which the side wall portion of the case, the heat transfer tube, and a connecting tube are fitted to each other can be achieved, and as a result, the respective parts can be brazed easily and appropriately.

A heat exchanger includes a tube expansion portion formed by expanding a heat transfer tube so that an outer peripheral surface of the heat transfer tube is pressed against an inner peripheral surface of a hole provided in a side wall portion of a case. The tube expansion portion includes first and second bulge portions positioned respectively on the inside and the outside of the side wall portion so as to sandwich the side wall portion in an axial length direction of the heat transfer tube and configured such that respective outer peripheral surfaces thereof partially bulge outward in a radial direction of the heat transfer tube, an end portion tip end of the heat transfer tube is positioned apart from the second bulge portion, and the end portion tip end and a part in the vicinity thereof are expanded so as to be included in a part of the tube expansion portion. Thus, effects such as improving the precision with which the side wall portion of the case, the heat transfer tube, and a connecting tube are fitted to each other can be achieved, and as a result, the respective parts can be brazed easily and appropriately.

The present disclosure relates to a fluid connection arrangement for establishing a fluid connection, including a receiving part having a receiving wall that has a receiving wall inner side that delimits an interior of the receiving part, a tubular connecting part that is at least partially received in the interior of the receiving part and has a tube wall having a plurality of comb-shaped support points that extend along a longitudinal direction of the tubular connecting part, the comb-shaped support points contacting the receiving wall inner side. The tube wall may have at least one curved wall area that extends between two adjacent comb-shaped support points. Between the at least one curved wall area of the tubular connecting part and the receiving wall inner side of the receiving part at least one gap is arranged where a solder is received to establish a materially bonded and fluid-tight connection.

The present disclosure relates to a fluid connection arrangement for establishing a fluid connection, including a receiving part having a receiving wall that has a receiving wall inner side that delimits an interior of the receiving part, a tubular connecting part that is at least partially received in the interior of the receiving part and has a tube wall having a plurality of comb-shaped support points that extend along a longitudinal direction of the tubular connecting part, the comb-shaped support points contacting the receiving wall inner side. The tube wall may have at least one curved wall area that extends between two adjacent comb-shaped support points. Between the at least one curved wall area of the tubular connecting part and the receiving wall inner side of the receiving part at least one gap is arranged where a solder is received to establish a materially bonded and fluid-tight connection.

According to an embodiment, a coil assembling method comprises: a bundling step bundling coil elements including a hollow coil element and extending parallel to one another, thereby forming a coil element bundle; a mold-setting step setting a mold around the coil element bundle formed in the bundling step; a first brazing step supplying a first brazing material into the mold while heating at least one of the first brazing material and the coil element bundle, thereby filling the mold with the first brazing material; a mold-removing step removing the mold after cooling and hence solidifying the first brazing material; and a second brazing step brazing a water supply/drain box to an end of the coil element bundle brazed with the first brazing material by using a second brazing material thereby communicating a hollow part of the hollow coil element with an inner space of the water supply/drain box.

According to an embodiment, a coil assembling method comprises: a bundling step bundling coil elements including a hollow coil element and extending parallel to one another, thereby forming a coil element bundle; a mold-setting step setting a mold around the coil element bundle formed in the bundling step; a first brazing step supplying a first brazing material into the mold while heating at least one of the first brazing material and the coil element bundle, thereby filling the mold with the first brazing material; a mold-removing step removing the mold after cooling and hence solidifying the first brazing material; and a second brazing step brazing a water supply/drain box to an end of the coil element bundle brazed with the first brazing material by using a second brazing material thereby communicating a hollow part of the hollow coil element with an inner space of the water supply/drain box.

Vibration absorption tubing and a manufacturing method thereof. The manufacturing method includes: a solder placement step including: placing solder at solder placement portions in an inner cavity of an adaptor; a pipe fitting step including: fitting a corrugated pipe and the adaptor respectively to adaptor matching portions at corresponding sides of the adaptor, to communicate an adaptor inner cavity with an inner cavity of the corrugated pipe and inner cavities of external connection tubing; and fixing or limiting positions of the corrugated pipe, the adaptor, and the external connection tubing to obtain a tubing assembly; and a component brazing step including: performing furnace brazing on the tubing assembly of the external connection tubing to obtain a main vibration absorption tubing. The vibration absorption tubing has favorable brazing consistency, enhancing connection reliability of components.

A joint member includes a joint main body configured to include a flow path portion formed and an opening portion communicating with the flow path portion, and a tube member configured to include an end portion inserted into the opening portion of the joint main body and joined to the joint main body by brazing. The joint main body includes a step portion on which the end portion of the tube member inserted into the opening portion abuts. The tube member includes an annular recessed portion recessed from an outer peripheral surface of the tube member and formed on a flexible tube side with respect to an end surface on a joint main body side.

A connecting element for a pipe arrangement, comprising a base body with at least one through channel, a receiving bore for receiving a pipe end of a pipe, wherein the receiving bore corresponds with the through channel, wherein the receiving bore has a larger cross section than the through channel, wherein a transition step is introduced into the base body between the through channel and the receiving bore, and an arrangement and a method for manufacturing an arrangement.