Denso Corporation

Denso Airs Corporation

Denso Air Systems Corporation

Fumiaki Nakamura

Shun Kurata

Hiroki Naganawa

Kinji Ochiai

Hiroki Ohara

Takahisa Suzuki

Yoshiaki Takano

Takashi Ono

Yukinori Hatano

Seiji Inoue

Kimio Kohara

Shigeru Kadota

Nobunao Suzuki

Makoto Yoshino

Yoshiharu Kajikawa

Kenichi Nara

Hideaki Inazawa

Satoru Yamanashi

Shinichi Inagaki

Akio Hirano

Kouichi Satou

Nobumichi Harada

Haruo Nagai

Nobuyoshi Okada

Hiroki Oguchi

Hideo Harada

Yasuhiro Ando

Atsushi Yazawa

Yasuaki Tsukagoshi

Shokichi Fukuoka

Minoru Maruyama

Shizuo Maruo

Masao Mutai

A double pipe forms an inner flow path, through which a low-pressure side refrigerant flows, inside an inner pipe, and forms an inner-outer flow path, through which a high-pressure side refrigerant flows, between the outer pipe and the inner pipe. It comprises an expansion valve side connector and a counter-expansion valve side connector which are interposed between distal ends of the outer pipe and the inner pipe and members to be connected. An outer diameter of the outer pipe is 30 millimeters or less. A ratio of a difference between an inner diameter of the outer pipe and an outer diameter of the inner pipe with respect to the inner diameter of the outer pipe is 25% or less. A sealing member is provided to prevent a refrigerant leakage. The plurality of members are mechanically fixed.

Internal heat exchanger and refrigeration cycle apparatus having the internal heat exchanger

A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be radially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.

Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same

A compound tube is disclosed that includes an outer tube and an inner tube disposed in the outer tube. A passage is defined between the outer tube and the inner tube. Various methods of joining the outer tube to the inner tube are disclosed.

Compound tube and method of producing the same

A method of manufacturing a double pipe includes a step of inserting a straight inner pipe into a straight outer pipe such that the inner pipe and the outer pipe are positioned at a predetermined relative position, a step of fixing a first end portion of the outer pipe to the inner pipe so as to form a first fixing portion, a step of bending the outer pipe and the inner pipe at the same time at a predetermined portion so as to form at least one bending portion after the fixing step of the first end portion, and a step of fixing a second end portion of the outer pipe to the inner pipe so as to form a second end portion after the bending.

Method of manufacturing double pipe

A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be readially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.

A refrigerant pipe connected to a suction side of a compressor and a refrigerant pipe connected to a discharge side of the compressor are integrated into one body. A refrigerant pipe connected to an inlet side of a condenser and a refrigerant pipe connected to an outlet side of the condenser are integrated into one body. A refrigerant pipe connected to an inlet side of a decompressor and a refrigerant pipe connected to an outlet side of the temperature detecting portion are integrated into one body. In these piping structures, a double pipe structure and a double pipe joint structure are adopted in which an inner pipe for circulating high pressure fluid and an outer pipe for circulating low pressure fluid are formed separate from each other and the respective end portions of the pipes are joined to a joint member by plastically deforming the pipes.

Vapour-compression type refrigerating machine and double pipe structure and double pipe joint structure preferably used therefor

The configuration comprises a shaping memberhaving a substantially rectangular shape and shaping the inner surface side of a bent portion, a worm gearslidably linked with the shaping memberand gradually reducing the distance between the shaping membersfor sequentially feeding the shaping memberfrom one side to the other side, and a reference memberarranged so that the upper end surface of the bent portioncomes into contact with its reference surface, and the distance between the shaping membersis gradually reduced to a predetermined fin pitch and the upper end surface of the bent portionis shaped into a predetermined shape by rotating the worm gearafter the plurality of bent portionsare arranged at the shaping members. Due to this, it is possible to shape the bent portion into a continuous and stable shape.

Device for shaping corrugated fin

The central position of each heating bodyin the fluid flow direction is referred to as a heating body central position, the central position of a heat radiating sectionlocated between the neighboring heating bodiesin the fluid flow direction is referred to as a heat radiating section central position, the end of a heat radiating sectionconnected to a pumpon the opposite side of a heat absorbing section is referred to as a heat radiating section front, the distances along the fluid flow from the heating body central position to the heat radiating section central position are referred to as heat transport distances and the distances from the heating body central position to the heat radiating section front are referred to as heat transport distances. S&#x3e;=the maximum heat transport distance Lmax holds. Lmax is the longest of the heat transport distances.

Vibration-flow-type heating-body cooling device

In a heat exchanger having a side plate for reinforcing a core portion, after an elastic support member for supporting the core portion is inserted between opposite walls of the side plate, a part of the opposite walls having a slit portion is plastically deformed at a position around the slit to form a protrusion. The protrusion protrudes toward the support member to be engaged with a recess of the elastic support member. Further, the silt is provided to penetrate through each opposite wall without being opened to an outer peripheral end of the side plate. Accordingly, the support member can be readily attached to the side plate, while it can prevent the side plate from being deformed in a brazing.

Heat exchanger having attachment structure of elastic support member

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Kariya, Japan

Fumiaki Nakamura