Abstract: A refrigerant circuit in an air conditioner comprises a compressor that compresses a refrigerant, a condenser that liquefies the refrigerant, a pressure reducing device that reduces the pressure of the compressed refrigerant, and an evaporator that exchanges heat by utilizing the refrigerant and generates an air-conditioning air. The condenser comprises plural fin tubes, through which the refrigerant passes, two headers, to which both ends of the fin tubes are connected and which has a firm structure, upper and lower mounting brackets that are fixed to the headers, and vibration insulating materials that collaborate with pin members and support the condenser via the upper and lower mounting brackets. The valve unit is fixed to the header or to the upper or lower mounting bracket.

Abstract: An evaporator has plural tubes arranged in parallel with each other in a width direction perpendicular to an air flowing direction. The tubes are further arranged in two rows in the air flowing direction, and tank portions extending in the width direction are also arranged in the two rows in the air flowing direction to correspond to the tubes. A refrigerant inlet and a refrigerant outlet are provided in the tank portions, respectively, at one side end in the width direction, so that refrigerant flows through all one-row tubes after passing through the other-row tubes. In the evaporator, throttle holes are provided in a distribution portion of the tank portions, for distributing refrigerant, so that a refrigerant distribution within the tubes can be arbitrarily set. Thus, air temperature blown out from the evaporator can be made uniform.

Abstract: A manufacturing method for an evaporator made of aluminum alloy. First, a three-layer aluminum alloy plate having a core made of Al—Mn alloy, a sacrifice anode layer made of aluminum alloy which is electro-chemically base with respect to the core and clad on one side of the core, and a brazing layer made of Al—Si alloy and clad on the other side of the core is uniformly rolled to be work-hardened. Next, the thin work-hardened aluminum alloy plate is bent to form a tube so that the sacrifice anode layer is disposed outside the tube to face air and the brazing layer is disposed inside the tube to face refrigerant. Then, plural tubes and outer fins are alternately laminated and are integrally brazed to tanks to form the evaporator. As a result, a thickness of the tube is reduced without deteriorating corrosion resistance of the tube, thereby decreasing a weight and a size of the evaporator.

Abstract: On the surface of a heat exchanging portion in a heat exchanger, a film made of a polyaniline is formed. When the heat exchanger operates, condensed water is adhered on the surface of the heat exchanger, and contacts the film made of the polyaniline. Accordingly, oxygen dissolved in the condensed water becomes active oxygen by the polyaniline, and organic substances contained in the condensed water is decomposed. Thus, an amount of organic substances attached to a surface of the heat exchanger can be reduced in low cost without equipment extension.

Abstract: A tube for a heat exchanger has notch portions at a longitudinal direction end portion to be inserted into a header tank. Further, several passage holes are provided in the tube to extend in a longitudinal direction of the tube in which refrigerant flows. The notch portions are formed by cutting parts of the tube to be defined by cut surfaces. The passage holes are not provided at portions corresponding to the cut surfaces. Therefore, the passage holes are securely prevented from being crushed and cut when the notch portions are formed by cutting. As a result, joining failure between the tube and the header tank can be prevented.

Abstract: In a refrigerant evaporator, plural tubes made of aluminum are arranged in a laminating direction perpendicular to an air flowing direction, and plural corrugated fins made of aluminum are disposed between adjacent tubes. In the evaporator, when a tube plate thickness TT of the tubes is set in a range of 0.10 mm-0.35 mm and a tube height TH of each tube in the laminating direction is set in a range of 1.5 mm-3.0 mm, pressure loss of refrigerant in a refrigerant passage becomes smaller, and a heat-conductive area of air becomes larger. Further, when a fin height FH of the corrugated fins is set in a range of 4.0-7.5 mm, fin effect of the corrugated fins is improved. As a result, heat-conductive performance of the evaporator is improved.

Abstract: According to the present invention, an outlet tank and an inlet tank are formed in one end side of a plurality of connecting bodies and the bent portions are formed in other end side of the connecting bodies. The plurality of the connecting bodies is formed by a pair of pressed plates and is laminated to form a predetermined space in which the fin is installed, thus creating a laminated type heat exchanger. The bent portions are formed in a bottom end portion of the connecting body, and in the remaining bottom end portion of the surface, there is formed an extending portion which extends to a side lower than the bottom end portion of the fin. Therefore, even when the condensed water becomes a water drop between the surface of the connecting body and the surface of the fin, the drop does not stay for a long time and is efficiently drained by the extending portion downwardly.

Abstract: According to the present invention, the tube element includes a connecting portion for connecting the pair of core plates at an upstream air side, an extending portion extending from each of the connecting portions of the core plate at the upstream air side and having a fin connecting portion connected to the corrugated fin, and a further upstream end portion of the extending portion located at an upstream side of the fin connecting portion which is located away from the corrugated fin to form a predetermined gap with the corrugated fin so as to communicate with the air passage. The extending portion including the fin connecting portion closes the whole space between the tube elements and the adjacent corrugated fins at the more upstream air side of the refrigerant passage, so that the air entering between the tube elements and the adjacent corrugated fins can be substantially shut off.

Abstract: A laminate-type evaporator is disclosed which is formed of a main heat exchanger, an auxiliary heat exchanger, and a connecting member integrally brazed, such that brazing performance between the auxiliary heat exchanger and the connecting member is enhanced and moisture does not remain between the auxiliary heat exchanger and the connecting member, while setting brazing temperature to a temperature which does not melt the main heat exchanger and also while shortening brazing time. Convexities are formed on a block joint, and a width of a brazed portion connecting these convexities and an end plate is made to be 5 mm or less. Additionally, a dimension of a clearance between the end plate and block joint is made to be 0.5 mm or more.

Abstract: An evaporator for cooling apparatus according to the present invention includes a cooled flow passages in a heat exchanging portion and a bypass flow passage bypassing the heat exchanging portion between a receiver for reducing the pressure (pressure P1) of liquefied refrigerant condensed by a condenser and an evaporator, which communicates in parallel with each other. A valve element is disposed in the bypass flow passage, and opens the bypass passage when the pressure P1 is equal to or less than a predetermined pressure where a refrigerant temperature within the cooled flow passage is more than a refrigerant temperature within a cooling flow passage when the refrigerant is introduced into the heat exchanging portion and where a refrigerant dryness is less than a predetermined value when the refrigerant is not introduced into the heat exchanging portion and pressure thereof is reduced directly to the refrigerant pressure within the evaporating portion.

Abstract: A laminate type heat exchanger is formed from a plurality of plates and integrally brazed and joined. This heat exchanger includes a joint block, a refrigerant heat-exchanging portion which causes heat exchange between refrigerants, and an evaporating portion which causes heat exchange between refrigerant and passenger-compartment air. The inventors formulated new index to perform successful integral brazing. A reference volume of a portion is a volume of the portion providing a predetermined amount of heat-receiving surface area of the portion,an index A of the portion is defined byA=(volume of material of the portion to be heated existing in a reference volume of the portion)/(the reference volume of the portion), and a ratio of an index A1 which is the index A of the first portion and an index A2 which is the index A of the second portion, i.e., A1/A2 is set within a certain range. Preferably, the certain range of the ratio of A1/A2 is defined by 1/2.2.ltoreq.A1/A2.ltoreq.2.2.

Abstract: A drain case 4 is disposed between the bottom wall of a unit case and the lower end of refrigerant passage pipes 15 of a stacked type refrigerant evaporator. The drain case 4 is W-shape in cross section, and comprising two pieces of outside inclined walls 32 contacting the side ends of two pieces of tank parts 16 and 17 formed at the lower end side of the refrigerant passage pipes 15, a chevron type protruded wall 33 contacting a recessed part 28 formed at the bottom end of the part between the adjacent two pieces of tank parts 16 and 17, and inside inclined walls 34 having a drain hole 36. In this arrangement, the condensed water flows from the side ends of the two pieces of tank parts 16 and 17 and the part between the two pieces of tank part 16 and 17 into the lower ends thereof reaches the two pieces of outside inclined walls 32 and protruded wall 33 of the drain case 4 before reaching the bottom end of the two pieces of tank parts 16 and 17, and then is efficiently drained therefrom.