Denso Corporation

Denso Corpora Tion

Ryohei Sugimura

Yoshiki Katoh

Hiroshi Mieda

Masaaki Kawakubo

Daiki Kato

Tetsuya Ito

Yasuhiro Kawase

Hiroki Matsuo

Yasuhiro Mizuno

Isao Tamada

Yuichi Kami

Mitsuyoshi Saito

Mitsuharu Inagaki

Masahiro Omae

Ken Mutou

Masanobu Iio

Shinichiro Takise

Mitsuyoshi Saitou

The heat exchanger includes a first heat-exchange portion and a second heat-exchange portion. The first heat-exchange portion includes a first header tank having an inflow portion through which the heat medium flows into the first heat-exchange portion. The second heat-exchange portion includes a second header tank having an outflow portion through which the heat medium flows out of the second heat-exchange portion. The first header tank and the second header tank are connected to each other via a connecting portion. The connecting portion has a slit passing through the connecting portion.

Heat exchanger

A heat exchanger includes a heat exchanging portion, a reservoir that performs gas-liquid separation on a gas-liquid two-phase refrigerant that flows out from the heat exchanging portion into a gas-phase refrigerant and a liquid-phase refrigerant and stores the liquid-phase refrigerant, and an inflow passage that allows the gas-liquid two-phase refrigerant flowing out from the heat exchanging portion to flow into the reservoir. The inflow passage is connected so as to be in communication with an inlet port of the reservoir which is disposed above a liquid surface of the liquid-phase refrigerant stored in the reservoir.

A heat exchanger includes plural tubes, a first tank, and a second tank. Refrigerant flows in order of a first internal passage of the first tank, a first tube, the second tank, a second tube, and a second internal passage of the first tank. A channel forming portion is provided inside the second tank to form a refrigerant channel having a cross-sectional area smaller than that of an internal passage of the second tank in a cross-section orthogonal to a longitudinal direction of the second tank. The refrigerant channel is arranged so that a projection area of the refrigerant channel overlaps the tube when viewed in the longitudinal direction of the second tank.

In a heat pump cycle device, a flow passage switching portion includes a flow passage switching valve body configured to open and close a cooling side flow passage. A refrigerant circulation circuit includes a low-pressure flow passage through which a low-pressure refrigerant decompressed by a first decompressor flows toward a compressor in a heating mode, and a pre-evaporator flow passage provided between the flow passage switching valve body and a refrigerant inlet of an evaporator. The flow passage switching portion causes a pre-evaporator flow passage to communicate with the low-pressure flow passage while bypassing the evaporator when a refrigerant pressure in the low-pressure flow passage is lower than a refrigerant pressure in the pre-evaporator flow passage, in the heating mode.

Heat pump cycle device and valve device

A stack type heat exchanger includes a plurality of first plates and a plurality of second plates. At least one of the respective first plates and the respective second plates has a protrusion protruding from a main body of the first plate or the second plate toward a first flow path, the protrusion being located at a peripheral portion of a tank space in the first flow path. The first plate and the second plate are joined to each other through the protrusion. The protrusion has a top portion and a side wall portion. A part of the side wall portion adjacent to the tank space has a thick structure portion, an entire thickness of the thick structure portion being thick in a direction perpendicular to the stacking direction.

Stack type heat exchanger

An integrated valve includes a body portion, a flow rate adjustment valve body, a flow passage switching valve body, and a shaft member. The body portion has formed therein a plurality of passages. The flow rate adjustment valve body is provided inside the body portion that adjusts a flow rate of fluid. The flow passage switching valve body is provided inside the body portion configured to switch a flow path of the predetermined fluid in the fluid circulation circuit, the flow passage switching valve body being switchable between distinct communication states. The shaft member is provided inside the body portion that interlocks the flow rate adjustment valve body and the flow passage switching valve body.

Integrated valve device

A heat pump system includes a compressor that compresses and discharges a refrigerant, a decompressor that decompresses the refrigerant, an outdoor unit that exchanges heat between the refrigerant and an outside air, an evaporator that evaporates the refrigerant, a condenser that condenses the refrigerant, an internal heat exchanger, an accumulator that separates the refrigerant into a gas refrigerant and a liquid refrigerant, and a flow pathway changing portion. The internal heat exchanger includes a high-pressure passage through which a high-pressure refrigerant flows, and a low-pressure passage through which a low-pressure refrigerant flows, the internal heat exchanger exchanging heat between the refrigerant flowing through the high-pressure passage and the refrigerant flowing through the low-pressure passage. The flow pathway changing portion that switches between a cooling pathway and a heating pathway. According to this heat pump system, a cooling capacity and a heating capacity can be improved.

Heat pump system

A heat exchanger includes: a heat exchanging portion configured to exchange heat between a refrigerant flowing through therein and air; a liquid reservoir configured to separate a gas-liquid two-phase refrigerant flowing out of the heat exchanging portion into a gas-phase refrigerant and a liquid-phase refrigerant, the liquid reservoir storing the liquid-phase refrigerant; and a refrigerant adjustment portion configured to adjust a flow state of the refrigerant flowing into the refrigerant adjustment portion through a refrigerant passage of the refrigeration cycle, supply the refrigerant to the heat exchanging portion and adjust an outflow state and an outflow destination of the refrigerant flowing out of the heat exchanging portion or the liquid reservoir. At least a part of the refrigerant adjustment portion is inserted into the liquid reservoir.

A heat exchanger includes a liquid reservoir configured to separate a gas-liquid two-phase refrigerant flowing out of an upstream heat exchanging portion into a gas-phase refrigerant and a liquid-phase refrigerant, and a refrigerant adjustment portion configured to adjust an outflow state and an outflow destination of the refrigerant flowing out of a downstream heat exchanging portion or the liquid reservoir. The liquid reservoir includes a liquid reserving portion configured to store the liquid-phase refrigerant and a gas reserving portion configured to store the gas-phase refrigerant. The refrigerant adjustment portion faces the liquid reserving portion across the gas reserving portion.

A heat exchanger includes: stacked tubes through which a refrigerant flows; and a fin joined to the tube to increase a heat exchange area with air flowing around the tube. A cross-section of the fin perpendicular to a flow direction of the air is shaped in a wave shape that has: planar sections substantially parallel to the flow direction of the air; and a top for connecting between the adjacent planar sections. A clearance is defined in the planar section of the fin. When a portion of the fin where the shortest distance from a center line between the adjacent planar sections becomes the maximum is set as a furthest section in a cross-section perpendicular to a stacking direction of the tubes, the clearance is defined in one furthest section or at least one of a plurality of furthest sections.

Each tube and a corresponding fin satisfy all of the following relationships: Lp&#x2212;t&#x2267;0.03Tr+0.22; Lp&#x2212;t&#x2266;0.115Tr&#x2212;1.14Tr+2.35; and Lp&#x2212;t&#x2267;5Tr&#x2212;8.3Tr+3, where Lp denotes a width of a sub-passages, Tr denotes a refrigerant passage height, and t denotes a plate thickness of the fin. The amount of a brazing material, which is present through an entire extent of the width of the sub-passage, is set to satisfy a relationship of 0.005&#x2266;S/L&#x3c;0.5, where S denotes a size of a cross-sectional area of the brazing material, and L denotes a length of a center line of a corresponding portion of the fin, which is present through the entire extent of the width of the sub-passage.

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Kariya, Japan

Ryohei Sugimura