A return bend ringing apparatus includes a ring station configured to receive a pair of rings and a pair of pins configured to move between a retracted position and an extended position. Each pin includes a tapered end and a shoulder. The pins in the retracted position are configured not to engage the rings, and the pins in the extended position are configured to engage the rings with each pin extending through one of the rings. A gripper is configured to grip and move a return bend into an engagement position in which the return bend engages the shoulder of each pin.

A refrigerant evaporator includes: a first heat exchange part in which refrigerant flows to exchange heat with fluid to be cooled; a second heat exchange part arranged to oppose the first heat exchange part; a first tank arranged below the first heat exchange part to distribute the refrigerant to the first heat exchange part; a second tank arranged below the second heat exchange part to collect the refrigerant flowing through the second heat exchange part; and a third tank joined to the first tank and the second tank by brazing. A projection part is formed at one of joint portions between the first tank and the third tank. An insertion part is formed at the other of the joint portions between the first tank and the third tank, and the projection part is inserted in the insertion part.

A heat exchanger includes a main body portion and a cover. The main body portion includes a heat exchange core, a collecting pipe portion and a first mounting shell. The collecting pipe portion includes a first collecting pipe portion and a second collecting pipe portion. Both the first collecting pipe portion and the second collecting pipe portion are provided with mounting end plates. Two ends of the first mounting shell are hermetically connected to the mounting end plates by brazing. The first mounting shell encloses part of the heat exchange core in a circumferential direction. Two ends of the cover are hermetically connected to the mounting end plates by bonding. The cover and the first mounting shell are arranged in an enclosing manner in the circumferential direction. The heat exchanger improves stability and reliability. A manufacture method of the heat exchanger is also disclosed.

Embodiments of the present invention include a connection pipe and a method of manufacturing the connection pipe for an evaporator of a refrigeration device. In the connection pipe and method, high-frequency welding is performed while a first pipe is at one side of a tube and a second pipe is at another side of the tube are welded, and a first curvature portion is in the first pipe and a second curvature portion is in the second pipe. Even though the connection pipe according to embodiments of the present invention is forced or pressed to connect a suction pipe to the second pipe, the connection pipe may not be deformed or damaged due to a structural characteristic during installation of the evaporator in the refrigeration device.

A pipeless liquid-cooled heat dissipation system includes a heat dissipation device, a pumping device, a water reservoir, and a heat absorption device, which are integratedly combined and interconnected without a pipe. An interior of the water reservoir is partitioned into at least two space regions to control a flow direction of the liquid. A hole-slot structure is arranged on the water reservoir. The pumping device is installed in the hole-slot structure and interconnected with the water reservoir. The heat absorption device is further configured on the water reservoir and interconnected with the water reservoir. The water reservoir and the heat dissipation device are integrally formed by welding and are interconnected with each other.

Some embodiments of the present disclosure provide a heat exchanger, including: at least three heat exchange tube groups, herein the heat exchange tube groups are communicated in sequence, and at least two heat exchange tube groups are superposed mutually along a direction in which a heat exchange airflow flows, a medium sequentially flows through each heat exchange tube group and forms a U-shaped trajectory; an intermediate adapter portion, herein at least two heat exchange tube groups are communicated with each other by means of the intermediate adapter portion, the intermediate adapter portion includes at least two adapters and an adapter tube communicated with the two adjacent adapters, herein the adapter is composed of a first plate and a second plate, the adapter tube is an extrusion-formed flat tube, and a width direction of the adapter tube is perpendicular to a width direction of the heat exchange tube groups.

An air conditioner and a method of manufacturing the same are disclosed. The air conditioner includes an indoor heat exchanger and an outdoor heat exchanger, each including a plurality of refrigerant pipes and at least one connection pipe for interconnecting the refrigerant pipes, a welding hole formed in the connection pipe by punching, and a welding ring mounted over the welding hole, wherein portions of the refrigerant pipes are inserted into the connection pipe through inlet ends of the connection pipe, the welding hole is located between ends of the refrigerant pipes and the inlet ends of the connection pipe, and the connection pipe is bonded to the refrigerant pipes by heating at least one selected from between the refrigerant pipes and the welding ring.

A vehicle air conditioning system provides a heat exchanger and a vehicle air conditioning system comprising same, which can simplify the overall structure and can easily perform cooling/heating of air for air conditioning and dehumidification heating by using an integrated heat exchanger which is selectively supplied with low- and high-temperature cooling water by a supply valve to perform heat exchange.

In order to reduce the dimensions of a heat exchanger it is suggested to configure the heat exchanger in such a way that it has a heat exchanging element comprising a condenser unit and an evaporator unit. The evaporator unit comprises a lower end area, an upper end area and a plurality of channels for transporting a refrigerant from the lower end area to the upper end area, said refrigerant comprising liquid and gas. The upper end area is connected to the lower end area by a first line which is configured to transfer only liquid from the upper end area to the lower end area.

A heat exchanger includes plural flat tubes each having a flat cross section, and plural flat-tube U-bends each having a flat cross section and a U-shape in external appearance. Plural flat-tube columns each made up of the plural flat tubes installed in plural tiers in a set direction are arranged in a direction intersecting the set direction and in a staggered manner. Each of the plural flat-tube U-bends is placed in a pair of coupling portions of the plural flat tubes. Each of the pair of coupling portions is placed in one of a pair of the plural flat-tube columns. The plural flat-tube U-bends are twisted such that major axes of flat cross sections in both end portions of each of the plural flat-tube U-bends are oriented in the same directions as major axes of flat cross sections of the plural flat tubes connected to the both end portions.