JP2007178016A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of reducing its weight and cost while ensuring the sufficient pressure resistance of an inlet header. <P>SOLUTION: A gas cooler 1 is provided with a pair of header tanks 2, 3 and a plurality of heat exchange pipes 4 arranged in parallel between both header tanks 2 and 3 and having both ends connected with both the header tanks 2, 3, respectively. Each header tank 2, 3 is constituted by stacking an outer side plate 7, an inner side plate 8, and an intermediate plate 9 and brazing them. The first header tank 2 is provided with the inlet header 10A and an outlet header (10B). The outer side plate 7 of the first header tank 2 is divided into an inlet header constitution 7A and an outlet header constitution 7B. Wall thicknesses of both of header constitutions 7A, 7B are the same. The strength of a heat exchanger use temperature zone of a material forming the inlet header constitution 7A is made to be higher than the strength of a heat exchanger use temperature zone of a material forming the outlet header constitution 7B by 10 to 50%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a heat exchanger, and more specifically, for example, a supercritical refrigerant such as CO ₂ (carbon dioxide) is used. For example, the invention is preferably used for a gas cooler of a supercritical refrigeration cycle mounted on a vehicle as a car air conditioner. It relates to a heat exchanger.

  In this specification and claims, the term “supercritical refrigeration cycle” means a refrigeration cycle in which the refrigerant is in a supercritical state exceeding the critical pressure on the high pressure side, and “supercritical refrigerant” It shall mean a refrigerant used in a supercritical refrigeration cycle.

  For example, as a heat exchanger used in a gas cooler of a supercritical refrigeration cycle applied to a car air conditioner of a vehicle, a pair of header tanks arranged at a distance from each other and a parallel arrangement with a gap between the two header tanks Each header having a flat heat exchange pipe having both ends connected to both header tanks and fins brazed to the heat exchange pipe and disposed in a ventilation gap between adjacent heat exchange pipes. The tank is formed by laminating and brazing an outer plate, an inner plate, and an intermediate plate interposed between the two plates, and opens the outer plate of the first header tank by the intermediate plate. Are formed side by side in the length direction, and an opening is formed in the outer plate of the second header tank by an intermediate plate. One chained outward bulging portion is formed so as to straddle the two outward bulging portions of the first header tank, and a portion corresponding to each outward bulging portion of the outer plate in each header tank is a header. A heat exchanger is known in which one header of the first header tank is an inlet header having a refrigerant inlet, and the other header is an outlet header having a refrigerant outlet (see Patent Document 1). .

  Usually, a heat exchanger used in a gas cooler of a supercritical refrigeration cycle applied to a car air conditioner of a vehicle is often formed of aluminum or an aluminum alloy for reasons such as light weight, high thermal conductivity, and low cost. Each plate constituting the header tank in the description is also formed of an aluminum alloy, and the outer plate is formed of an aluminum brazing sheet in which both sides of a core material made of JIS A3003 are covered with a skin material made of an aluminum alloy brazing material, for example. Yes.

  In the supercritical refrigeration cycle, the refrigerant compressed by the compressor becomes high temperature and high pressure, and the temperature of the supercritical refrigerant flowing into the inlet header of the gas cooler may exceed 150 ° C. Therefore, in the heat exchanger described in Patent Document 1, in order to increase the strength of the portion constituting the inlet header in the outer plate of the first header tank in the above temperature range and improve the pressure resistance of the inlet header, The thickness of the entire plate is increased so as to satisfy the strength in the temperature range described above, or the material of the entire outer plate is made of a material that can satisfy the strength in the temperature range described above.

By the way, since the temperature of the refrigerant flowing into the outlet header is greatly reduced, it is not necessary to increase the strength of the portion constituting the outlet header in the outer plate of the first header tank. Therefore, as described above, when the thickness of the entire outer plate is increased, the thickness of the portion constituting the outlet header becomes unnecessarily thick, and the weight of the entire heat exchanger increases. . In addition, as described above, when the material of the entire outer plate is a material that can satisfy the above-described strength in the temperature range, the cost increases.
JP-A-2005-300135

  An object of the present invention is to provide a heat exchanger that solves the above-described problems and can achieve weight reduction and cost reduction while ensuring sufficient pressure resistance of the inlet header.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A pair of header tanks spaced apart from each other and a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks, Each header tank is formed by laminating and brazing an outer plate, an inner plate, and an intermediate plate interposed between the two plates, and the first header tank has a length direction. In the heat exchanger in which a plurality of headers arranged are provided and the header at one end in the length direction of the first header tank is an inlet header having a refrigerant inlet,
The heat exchanger by which the 1st header structure part which comprises the inlet header in the outer side plate of a 1st header tank is divided | segmented from the 2nd header structure part which comprises the header adjacent to this.

  2) The heat described in 1) above, wherein the heat exchanger operating temperature range strength of the first header component in the outer plate of the first header tank is higher than the heat exchanger operating temperature range strength of the second header component. Exchanger.

  3) The first header component and the second header component in the outer plate of the first header tank are made of the same material, and the thickness of the first header component is smaller than the thickness of the second header component. The heat exchanger according to claim 2, wherein the heat exchanger is 5 to 30% thick.

  In the heat exchanger of 3) above, the thickness of the first header component is 5 to 30% thicker than the thickness of the second header component when the first header component is less than 5%. The heat exchanger operating temperature range strength, which is the strength in the operating temperature range of the heat exchanger, is not sufficiently greater than the heat exchanger operating temperature range strength of the second header component, and if it exceeds 30%, the first This is because it may be difficult to process the header component.

  4) The thickness of the first header component and the second header component in the outer plate of the first header tank is the same, and the heat exchanger operating temperature range strength of the material forming the first header component is 2) The heat exchanger according to 2) above, which is 10 to 50% higher than the heat exchanger operating temperature range strength of the material forming the header component.

  In the heat exchanger of 4) above, the heat exchanger use temperature range strength, which is the strength in the use temperature range of the heat exchanger in the material constituting the first header component, is used as the heat exchanger use of the second header component. 10-50% higher than the temperature range strength is less than 10%, the heat exchanger use temperature range strength of the first header component is higher than the heat exchanger use temperature range strength of the second header configuration Is not sufficiently large, and if it exceeds 50%, it may be difficult to process the first header component.

  5) The first header component and the second header component on the outer plate of the first header tank are each formed of an aluminum alloy containing Mn, Cu, Si and Mg, and Mn, Cu of the first header component The heat exchanger according to 4) above, wherein the content of at least one of Si and Mg is larger than the content of the same kind of element in the second header component.

  6) The heat exchanger according to 5) above, wherein the Mn content in the first header component is 0.1% by mass or more than the Mn content in the second header component.

  7) The heat exchanger according to 5) or 6) above, wherein the Cu content of the first header component is 0.05% by mass or more than the Cu content of the second header component.

  8) The heat exchange according to any one of 5) to 7) above, wherein the Si content of the first header component is 0.1% by mass or more than the Si content of the second header component. vessel.

  9) The heat exchange according to any one of 5) to 8) above, wherein the Mg content of the first header component is 0.05% by mass or more than the Mg content of the second header component. vessel.

  In the heat exchangers 5) to 9), Mn, Cu, Si and Mg are elements that increase the strength of the aluminum alloy. However, when the Mn content of the first header component is less than 0.1% by mass than the Mn content of the second header component, the Cu content of the first header component is the second If the Cu content in the header component is less than 0.05% by mass, the Si content in the first header component is less than 0.1% by mass than the Si content in the second header component. However, if the Mg content of the first header component is less than 0.05% by mass than the Mg content of the second header component, the first header configuration The heat exchanger operating temperature range strength of the part may not be sufficiently larger than the heat exchanger operating temperature range strength of the second header component.

  10) The first header component in the outer plate of the first header tank is Mn 0.8-1.7 mass%, Cu 0.15-0.5 mass%, Si 0.4-1.7 mass%, Mg 0.05 The heat exchanger according to any one of 5) to 9) above, which is formed of an aluminum alloy containing ˜1% by mass, the balance being Al and inevitable impurities.

  In the heat exchanger of 10) above, Mn, Cu, Si and Mg contained in the aluminum alloy constituting the first header component each have the effect of increasing the heat exchanger operating temperature range strength of the first header component. However, if the contents of Mn, Cu, Si and Mg are less than the lower limit, this effect is not sufficient. In addition, if the Mn content exceeds the upper limit value, a coarse intermetallic compound may be generated and the workability may be deteriorated. If the Cu content exceeds the upper limit value, the corrosion resistance may be reduced, and the Si content may be decreased. When the upper limit is exceeded, the melting point is lowered and there is a possibility of melting at the time of brazing, and when the Mg content exceeds the upper limit, the brazing property may be lowered.

  11) Any one of the above 2) to 10), wherein the first header component on the outer plate of the first header tank has a yield strength of 50 MPa or more and a tensile strength of 100 MPa or more in a temperature range of 150 to 180 ° C. The heat exchanger as described in.

  When the heat exchangers 1) to 10) are used as a gas cooler of a supercritical refrigeration cycle, the temperature of the supercritical refrigerant flowing from the refrigerant inlet into the inlet header is about 150 to 180 ° C. In this temperature range, when the proof stress of the first header component is 50 MPa or more and the tensile strength is 100 MPa or more, the heat exchanger used is the strength in the operating temperature range of the heat exchanger in the first header component. The temperature region strength is sufficiently increased, and the pressure resistance of the inlet header is reliably improved.

  12) The first header component on the outer plate of the first header tank is more noble than the second header component, and the potential difference between both header forming portions is 30 mV or more 1) or 4) The described heat exchanger.

  In the heat exchanger of 12) above, the first header component on the outer plate of the first header tank is more noble than the second header component. By sacrificing the header component, the corrosion of the first header component is suppressed, and as a result, strength reduction due to the progress of corrosion of the first header component is prevented. However, if the potential difference between both header forming portions is less than 30 mV, this effect may not be sufficient. The potential difference between both header forming portions is preferably 50 to 300 mV. This is because if it exceeds 300 mV, the portion that is desired to be sacrificed is lost in a short period of time, and the first header component may not be protected in the long term.

  13) The first header component and the second header component on the outer plate of the first header tank are each formed of an aluminum alloy containing Mn, Cu and Si, and Mn, Cu and Si of the first header component The heat exchanger as described in 12) above, wherein the content of at least one of the above is greater than the content of the same kind of element in the second header component.

  14) The heat exchanger according to 13) above, wherein the Mn content in the first header component is 0.1% by mass or more than the Mn content in the second header component.

  15) The heat exchanger according to 13) or 14) above, wherein the Cu content in the first header component is 0.05% by mass or more than the Cu content in the second header component.

  16) The heat exchange according to any one of 13) to 15) above, wherein the Si content of the first header component is 0.1 mass% or more than the Si content of the second header component. vessel.

  In the heat exchangers of the above 13) to 16), Mn, Cu and Si contained in the aluminum alloy constituting the first header component make the first header component potential noble and the first header configuration. It is an element that increases the strength of the part. However, when the Mn content of the first header component is less than 0.1% by mass than the Mn content of the second header component, the Cu content of the first header component is the second When the Cu content of the header component is less than 0.05% by mass, the Si content of the first header component is 0.1% by mass than the Si content of the second header component. In the case where the number is less than that, the effect of making the potential of the first header component portion noble and the effect of increasing the strength of the first header component portion are small, and the second header component portion is effectively sacrificed and corroded. May not be possible, and the heat exchanger operating temperature range strength of the first header component may not be sufficiently greater than the heat exchanger operating temperature range strength of the second header component.

  17) The 1st header structure part in the outer side plate of a 1st header tank contains Mn0.8-1.7 mass%, Cu0.15-0.5 mass%, Si0.4-1.7 mass%, and the remainder The heat exchanger according to any one of 13) to 16), which is formed of an aluminum alloy composed of Al and inevitable impurities.

  In the heat exchanger of the above 17), Mn, Cu and Si contained in the aluminum alloy constituting the first header constituent part increase the effect of making the first header constituent part noble and the strength of the first header constituent part, respectively. Although effective, if the content of Mn, Cu and Si is less than the lower limit, this effect is not sufficient. In addition, if the Mn content exceeds the upper limit value, a coarse intermetallic compound may be generated and the workability may be deteriorated. If the Cu content exceeds the upper limit value, the corrosion resistance may be reduced, and the Si content may be decreased. If the upper limit is exceeded, the melting point may decrease.

  18) The second header component in the outer plate of the first header tank is made of JIS A3003, and the first header component is Mn 1.2 to 1.7 mass%, Cu 0.1 to 0.5 mass%, Si0. The heat exchanger as described in 12) above, which is formed of an aluminum alloy containing 15 to 1.7% by mass, the balance being Al and inevitable impurities.

  When the second header component is made of JIS A3003 as in the heat exchanger of 18), in order to make the first header component potential noble and effectively sacrificial the second header component, It is effective to contain Mn, Cu and Si at least the lower limit values. The reason for limiting the upper limit values of Mn, Cu and Si is the same as that in the case of the heat exchanger of 17) above.

  19) The second header tank is provided with a header that is one less than the number of headers in the first header tank so as to straddle two adjacent headers in the first header tank. The header at the opposite end is an outlet header, and all the heat exchange tubes are composed of a plurality of heat exchange tubes arranged in a row in the length direction of the header tank, and the header of the first header tank The heat exchanger according to any one of 1) to 18) above, which is divided into the same number of paths.

  20) The first header tank is provided with two headers, the header adjacent to the inlet header is the outlet header, and the outer plate constituting the first header tank includes the first header component and The heat exchanger as described in 19) above, which is divided into two outlet header forming portions.

  21) The outer plates of both header tanks are formed with outward bulges extending in the length direction and closed by the intermediate plate, corresponding to the respective outward bulges of both header tanks. The heat exchanger according to any one of 1) to 20) above, in which is a header.

  22) A refrigeration cycle comprising a compressor, a gas cooler, an evaporator, a decompressor, and an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator, and using a supercritical refrigerant. A supercritical refrigeration cycle in which the gas cooler includes the heat exchanger according to any one of 1) to 21) above.

  23) The supercritical refrigeration cycle according to 22) above, wherein the supercritical refrigerant is carbon dioxide.

  24) A vehicle equipped with the supercritical refrigeration cycle described in 22) or 23) above as a car air conditioner.

  In this specification and claims, the description of the materials of the first header constituent part and the second header constituent part is that the first header constituent part and the second header constituent part each have a brazing material layer on at least one side thereof. In the case of a brazing sheet having a portion, it is a description of a portion excluding the material that has been once melted and solidified to adhere to the surfaces of the first header component and the second header component, that is, the core material of the brazing sheet. .

  According to the heat exchanger of 1) above, the first header constituent part constituting the inlet header in the outer plate of the first header tank is divided from the second header constituent part forming the header adjacent thereto. Therefore, in order to obtain sufficient pressure resistance of the inlet header in the operating temperature range of the heat exchanger, the first header component only needs to maintain the required strength in the operating temperature range of the heat exchanger. The thickness and material of one header component can be made appropriate. Therefore, it is not necessary to increase the thickness of the second header component, and the overall weight of the heat exchanger can be reduced. In addition, the material of the second header component need not be special, and the cost can be reduced.

  In addition, after brazing the first header component and the second header component of the outer plate to the intermediate plate, for example, when a helium leak test is performed, if a brazing defect occurs in these brazes, helium Leak to the outside is detected. Therefore, it is possible to easily detect a brazing failure, and it is possible to prevent a decrease in heat exchange performance due to a short circuit between the inlet header and the outlet header.

  According to the heat exchanger of 2) above, the heat exchanger operating temperature range strength of the first header component in the outer plate of the first header tank is higher than the heat exchanger operating temperature range strength of the second header component. Therefore, sufficient pressure resistance of the inlet header can be ensured in the operating temperature range of the heat exchanger. In addition, the material cost is low because the first header component only needs to have an appropriate thickness and material so that only the first header component maintains the required strength in the operating temperature range of the heat exchanger. become.

  According to the heat exchangers of 3) and 4) above, the heat exchanger operating temperature range strength of the first header component on the outer plate of the first header tank is the heat exchanger operating temperature range strength of the second header component. Than can be made sufficiently higher. In addition, the workability of the first header component is not impaired.

  According to the heat exchangers of 5) to 9) above, the heat exchanger operating temperature range strength of the first header component in the outer plate of the first header tank is set to the heat exchanger operating temperature range strength of the second header component. Than can be made sufficiently higher.

  According to the heat exchanger of 10) above, the heat exchanger operating temperature range strength of the first header component in the outer plate of the first header tank is sufficiently higher than the heat exchanger operating temperature range strength of the second header component. Can be high. Moreover, it is possible to prevent workability, corrosion resistance, melting during brazing, and brazing.

  When the heat exchanger of 11) above is used as a gas cooler for a supercritical refrigeration cycle, the strength of the temperature range of the supercritical refrigerant flowing from the refrigerant inlet into the inlet header is sufficiently increased, and the pressure resistance of the inlet header is increased. Will definitely improve.

  According to the heat exchanger of 12) above, the first header component on the outer plate of the first header tank is noble more than the second header component, and the potential difference between both header forming portions is 30 mV. As described above, the corrosion of the first header component is suppressed by sacrificing the second header component with respect to the first header component, and as a result, the corrosion of the first header component proceeds. It becomes possible to prevent strength reduction.

  According to the heat exchangers of 13) to 16) above, the heat exchanger operating temperature range strength of the first header component in the outer plate of the first header tank is set to the heat exchanger operating temperature range strength of the second header component. Than can be made sufficiently higher. In addition, the corrosion of the first header component is suppressed by sacrificing the second header component with respect to the first header component, resulting in a decrease in strength due to the progress of corrosion of the first header component. It becomes possible to prevent.

  According to the heat exchanger of 17) above, the heat exchanger operating temperature range strength of the first header component in the outer plate of the first header tank is sufficiently higher than the heat exchanger operating temperature range strength of the second header component. Can be high. Moreover, by corroding the second header component part sacrificially with respect to the first header component part, the corrosion of the first header component part is suppressed, and as a result, the strength decreases due to the progress of the corrosion of the first header component part. It becomes possible to prevent. Moreover, it is possible to prevent workability, corrosion resistance, melting during brazing, and brazing.

  Like the heat exchanger of the above 18), the second header component is often formed of JIS A3003, which has a low material cost and excellent workability. Even in this case, the first header constituent part includes Mn 1.2 to 1.7% by mass, Cu 0.1 to 0.5% by mass, Si 0.15 to 1.7% by mass, the balance Al and unavoidable When formed of an aluminum alloy made of impurities, the first header component can be made noble in potential and the second header component can be effectively sacrificed and corroded.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the header tank for a heat exchanger according to the present invention is applied to a gas cooler of a supercritical refrigeration cycle.

  In the following description, the upper and lower sides and the left and right sides in FIGS. In addition, the downstream side (direction indicated by arrow X in FIG. 1) of the air flowing through the ventilation gap between adjacent heat exchange tubes is referred to as the front, and the opposite side is referred to as the rear. Furthermore, in the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum. However, as a matter of course, the element symbol “Al” indicates an Al element.

Embodiment 1
This embodiment is shown in FIGS.

  1 and 2 show the overall configuration of a gas cooler to which a heat exchanger according to the present invention is applied, FIGS. 3 to 5 show the configuration of the main part thereof, and FIGS. 6 and 7 show a method of manufacturing a header tank. 8 and 9 show a heat exchange tube, and FIG. 10 shows a method for manufacturing the heat exchange tube.

In FIG. 1, a gas cooler (1) of a supercritical refrigeration cycle using a supercritical refrigerant, for example, CO ₂ , has two header tanks (2), (3) that are spaced apart in the left-right direction and extend in the up-down direction. Between the header tanks (2) and (3), a plurality of flat heat exchange pipes (4) arranged in parallel in the vertical direction and between adjacent heat exchange pipes (4) Corrugated fin (5) placed outside the heat exchange pipe (4) at the upper and lower ends and brazed to the heat exchange pipe (4), and outside the corrugated fin (5) at the upper and lower ends, respectively. And an aluminum side plate (6) brazed to the corrugated fin (5). In this embodiment, the right header tank (2) is referred to as a first header tank, and the left header tank (3) is referred to as a second header tank.

  As shown in FIGS. 2 to 5, the first header tank (2) is interposed between the outer plate (7), the inner plate (8), and the outer plate (7) and the inner plate (8). The intermediate plate (9) is laminated and brazed to each other, and an inlet header (10A) and an outlet header (10B) are provided side by side.

  The outer plate (7) includes an inlet header component (7A) (first header component) constituting the inlet header (10A) and an outlet header component (7B) (second header) constituting the outlet header (10B). Component). The inlet header component (7A) and the outlet header component (7B) are respectively formed with dome-shaped outward bulges (11A) and (11B) extending in the vertical direction and having the same bulge height and width. The peripheral edge of the opening facing the left side of the outwardly bulging portions (11A) and (11B) of both header components (7A) and (7B) is brazed to the intermediate plate (9), and each outwardly bulging portion (11A The opening facing the left side of (11B) is closed by the intermediate plate (9). As a result, each of the outwardly bulging portions (11A) and (11B) is a refrigerant circulation portion whose upper and lower ends are closed, and the outwardly bulging portions (11A) and (11B) of the first header tank (2). ) Correspond to an inlet header (10A) and an outlet header (10B).

  The inlet header component (7A) and the outlet header component (7B) of the outer plate (7) are each subjected to press processing on an aluminum brazing sheet in which both sides of an aluminum core are covered with an aluminum brazing material. The thickness of both is the same. The core material of the aluminum brazing sheet forming the outlet header component (7B) (hereinafter also simply referred to as the outlet header component (7B)) is, for example, an alloy containing Mn, Cu and Si such as JIS A3003 It is formed from an alloy containing Mn, Cu, Si and Mg, such as JIS A3004.

  Operating temperature range of the gas cooler (1) of the core material of the aluminum brazing sheet forming the inlet header component (7A) (hereinafter, the core material may be simply referred to as the inlet header component (7A)), for example, 150 to 180 ° C. The strength at is a proof stress of 50 MPa or more and a tensile strength of 100 MPa or more, which is 10 to 50% higher than the strength (proof strength and tensile strength) of the outlet header component (7B) in the above temperature range. It is preferable. Incidentally, the strength in the temperature range of 150 to 180 ° C. of JIS A3003 is that the proof stress is about 30 to 50 MPa, the tensile strength is about 60 to 80 MPa, and the strength in the temperature range of 150 to 180 ° C. of JIS A3004 is The proof stress is about 60 to 80 MPa, and the tensile strength is about 90 to 170 MPa.

  The inlet header component (7A) is more noble than the outlet header component (7B), and the potential difference between both header components (7A) and (7B) is preferably 30 mV or more. It is desirable that the potential difference between both header components (7A) and (7B) is 50 to 300 mV. In this specification and claims, “potential” shall mean a pitting potential.

  When the outlet header component (7B) is made of an alloy containing Mn, Cu and Si, the inlet header component (7A) is made of an alloy containing Mn, Cu and Si, and Mn, Cu in the alloy It is preferable that the content of at least one of Si and Si is larger than the content of the same type of element in the outlet header component (7B). For example, the Mn content of the inlet header component (7A) is 0.1 mass% or more higher than the Mn content of the outlet header component (7B), and the Cu content of the inlet header component (7A) However, the Cu content in the outlet header component (7B) is 0.05% by mass or more, and the Si content in the inlet header component (7B) is larger than the Si content in the inlet header component (7A). It is preferable that it is 0.1 mass% or more than. Specifically, the inlet header component (7A) includes Mn 0.8 to 1.7% by mass, Cu 0.15 to 0.5% by mass, Si 0.4 to 1.7% by mass, the remaining Al and unavoidable. It is preferably formed of an alloy made of impurities. Further, when the outlet header component (7B) is made of JIS A3003, the inlet header component (7A) is Mn 1.2 to 1.7 mass%, Cu 0.1 to 0.5 mass%, Si 0.15 to 1. It is preferably formed of an alloy containing 7% by mass, the balance being Al and inevitable impurities. In addition, 0.05-1 mass% of Mg may contain in the inlet header structure part (7A).

  When the outlet header component (7B) is made of an alloy containing Mn, Cu, Si and Mg, the inlet header component (7A) is made of an alloy containing Mn, Cu, Si and Mg, It is preferable that the content of at least one of Mn, Cu, Si, and Mg is greater than the content of the same kind of element in the outlet header component (7B). For example, the Mn content of the inlet header component (7A) is 0.1 mass% or more higher than the Mn content of the outlet header component (7B), and the Cu content of the inlet header component (7A) However, the Cu content in the outlet header component (7B) is 0.05% by mass or more, and the Si content in the inlet header component (7B) is larger than the Si content in the inlet header component (7A). The Mg content of the inlet header component (7A) is 0.05 mass% or more higher than the Mg content of the outlet header component (7B). Is preferred. Specifically, the inlet header component (7A) is composed of Mn 0.8 to 1.7 mass%, Cu 0.15 to 0.5 mass%, Si 0.4 to 1.7 mass%, Mg 0.05 to 1 mass. %, And is preferably made of an alloy composed of the balance Al and inevitable impurities.

  According to the above two combinations of the inlet header component (7A) and the outlet header component (7B) in the outer plate (7), the inlet header component (7) of the outer plate (7) of the first header tank (2) ( The strength of the gas cooler (1) in the operating temperature range in 7A) can be sufficiently higher than the strength of the gas cooler (1) in the operating temperature range of the outlet header component (7B). Moreover, by corroding the outlet header component (7B) sacrificially against the inlet header component (7A), corrosion of the inlet header component (7A) is suppressed, and as a result, the inlet header component (7A) It is possible to prevent a decrease in strength due to the progress of corrosion. Moreover, it is possible to prevent workability, corrosion resistance, melting during brazing, and brazing.

  A refrigerant inlet (12) is formed at the top of the outer bulging portion (11A) of the inlet header component (7A) of the outer plate (7), and a refrigerant inlet (11) is formed on the outer surface of the outer bulging portion (11A). An inlet member (13) made of metal having a refrigerant inflow path (14) leading to 12), here made of aluminum bare material, is brazed using a brazing material on the outer surface of the inlet header component (7A). In addition, a refrigerant outlet (15) is formed at the top of the outer bulging portion (11B) of the outlet header component (7B), and communicates with the refrigerant outlet (15) on the outer surface of the outer bulging portion (11B). An outlet member (16) made of metal having a refrigerant outflow path (17), here made of aluminum bare material, is brazed using the brazing material on the outer surface of the outlet header component (7B).

  A plurality of through-tube insertion holes (18) that are long in the front-rear direction are formed in the inner plate (8) at intervals in the vertical direction. The plurality of tube insertion holes (18) in the upper half are formed in the vertical range of the outward bulging portion (11A) of the inlet header component (7A), and are also the plurality of tube insertion holes in the lower half (18) is formed within the vertical range of the outward bulging portion (11B) of the outlet header component (7B). The length in the front-rear direction of the tube insertion hole (18) is slightly longer than the width in the front-rear direction of each outward bulge (11A) (11B). It protrudes outward from the front and rear side edges of the side bulges (11A) and (11B). In addition, the front and rear side edges of the inner plate (8) protrude rightward and the tips reach the outer surfaces of both header components (7A) and (7B) of the outer plate (7), and both header components (7A ) (7B) and the intermediate plate (9) are integrally formed with a covering wall (19) that covers the entire length of the boundary, and is formed on both front and rear sides of both header components (7A) (7B) and the intermediate plate (9). It is brazed. A plurality of engaging portions (21) that engage with the outer surfaces of both header constituent portions (7A) and (7B) of the outer plate (7) are integrated with the protruding end of each covering wall (19) at intervals in the vertical direction. And is brazed to both header components (7A) and (7B). The inner plate (8) is formed by pressing an aluminum brazing sheet in which both surfaces of an aluminum core material are covered with an aluminum brazing material skin material.

  Insert the tube insertion hole (18) of the inner plate (8) into the intermediate plate (9) and the outer bulges (11A) (11B) of both header components (7A) (7B) of the outer plate (7). The same number of penetrating communication holes (22) to be communicated with the tube insertion holes (18) is formed. Each communication hole (22) is formed at a position corresponding to each tube insertion hole (18) of the inner plate (8), and the hole width of the communication hole (22) is the same as the tube insertion hole (18). ing. At both ends (front and rear ends) of the communication hole (22) in the length direction of the communication hole (22) of the intermediate plate (9), the communication hole (22) A stepped portion (25) that protrudes inward and abuts the end face of the heat exchange tube (4) is formed. The projecting height from the inner peripheral surface of the communication hole (22) in the step portion (25) of the intermediate plate (9) is set so as not to block the refrigerant passage (4a) described later of the heat exchange pipe (4). ing. The plurality of tube insertion holes (18) in the upper half of the inner plate (8) are connected to the inlet header component (7A) via the plurality of communication holes (22) in the upper half of the intermediate plate (9). The plurality of tube insertion holes (18) in the lower half are also passed through the plurality of communication holes (22) in the lower half of the intermediate plate (9). It is made to communicate in the outward bulging part (11B) of the header component part (7B). All communication holes (22) leading into the outer bulge (11A) of the inlet header component (7A) and all communication leading to the outer bulge (11B) of the outlet header component (7B) The holes (22) are communicated with each other by a communicating portion (23) formed by cutting away a portion between adjacent communicating holes (22) in the intermediate plate (9), whereby the intermediate plate (9) In addition, a refrigerant circulation part communicating with the refrigerant circulation part in the outward bulging parts (11A) (11B) is formed. Then, an inlet header (10A) and an outlet header (10B) are formed by the refrigerant circulation part in each outward bulge part (11A) (11B) and the refrigerant circulation part of the intermediate plate (9) communicating with the refrigerant circulation part. An internal space is formed.

  The second header tank (3) has substantially the same configuration as the first header tank (2), and the same components and the same parts are denoted by the same reference numerals. Both header tanks (2) and (3) are arranged so that the inner plates (8) face each other.

  The main difference between the second header tank (3) and the first header tank (2) is that the outer plate (7) is not divided and the whole is the outlet header component of the first header tank (2). It is made of aluminum brazing sheet made of the same material as (7B), and the outer plate (7) is one less than the number of outward bulges (11A) (11B) of the first header tank (2) The top end of the outer plate (7), so that one dome-shaped outward bulge (24) spans both the outward bulges (11A) (11B) of the first header tank (2). To the lower end, so that the second header tank (3) is one less than the inlet header (10A) and outlet header (10B) of the first header tank (2), here one intermediate header (20) is provided so as to straddle both headers (10A) and (10B) of the first header tank (2), and a refrigerant inlet and a refrigerant outlet are provided in the outward bulge portion (24). Not formed, all pipe insertion holes (18) on the inner plate (8) are connected to the outer bulges (24) of the intermediate header (24) through all the communication holes (22) of the intermediate plate (9). ) And all the communication holes (22) of the intermediate plate (9) are communicated by the communication part (23) formed by cutting away the part between the adjacent communication holes (22). This is the point. The bulge height and width of the outward bulge portion (24) are equal to the bulge height and width of the outward bulge portions (11A) and (11B) of the first header tank (2). In addition, the peripheral edge of the opening of the outer plate (7) facing the right side of the outward bulging portion (24) is brazed to the intermediate plate (9), and the opening facing the right side of the outer bulging portion (24). Is closed by an intermediate plate (9). As a result, the inside of the outward bulge portion (24) is a refrigerant circulation portion whose upper and lower ends are closed. Then, the supercritical refrigerant flows in the intermediate header (20) through the refrigerant circulation part in the outward bulging part (24) and the refrigerant circulation part of the intermediate plate (9) leading to the refrigerant circulation part. It is like that.

  A method of manufacturing both header tanks (2) and (3) will be described with reference to FIGS.

  First, an aluminum brazing sheet, in which both surfaces of an aluminum core material are covered with an aluminum brazing material, is pressed to form an inlet header component (7A) of the outer plate (7) of the first header tank (2). ) And an outlet header component (7B). At this time, a refrigerant inlet (12) and a refrigerant outlet (15) are formed in the outward bulges (11A) (11B), respectively. Further, the outer plate (7) of the second header tank (3) is formed by pressing an aluminum brazing sheet in which both surfaces of the aluminum core are covered with an aluminum brazing material.

  Also, by pressing the aluminum brazing sheet with both sides of the aluminum core material covered with the aluminum brazing material, the tube insertion hole (18), the covering wall (19) and the covering wall (19) are straightened. An inner plate (8) having an engaging portion forming projection piece (21A) connected to is formed. Furthermore, the intermediate plate (9) having the communication hole (22), the step portion (25), and the communication portion (23) is formed by pressing the aluminum bear material.

  Next, after combining the inlet header component (7A) and the outlet header component (7B), the inner plate (8) and the intermediate plate (9) in a laminated form, the projecting piece (21A) is bent and the engaging portion (21 ) And the engaging portion (21) is engaged with the inlet header component (7A) and the outlet header component (7B) to form a temporary fixing body. Thereafter, the temporary fixing body is heated to a predetermined temperature, and both header structures are formed using the brazing filler metal layers of the inlet header component (7A) and the outlet header component (7B) and the brazing filler metal layer of the inner plate (8). Brazing part (7A) (7B), inner plate (8) and intermediate plate (9) together, covering wall (19), intermediate plate (9) and both header components (7A) (7B) The front and rear side surfaces, the engaging portion (21) and the header constituting portions (7A) and (7B) are brazed. Thus, the first header tank (2) is manufactured. After the three plates (7), (8), and (9) are combined in a laminated form, the protruding piece (21A) is bent to form the engaging portion (21), and the engaging portion (21) is connected to the outer plate ( Engage with 7) to make a temporary fixing body. Thereafter, the temporary fixing body is heated to a predetermined temperature, and the inlet header component (7A) and the outlet header component (7B) and / or the brazing material layer of the outer plate (7) and the brazing material layer of the inner plate (8). The three plates (7), (8) and (9) are brazed to each other using the, and the front and rear side surfaces of the covering wall (19), the intermediate plate (9) and the outer plate (7), and the engaging portion (21) and the outer plate (7) are brazed. Thus, the second header tank (3) is manufactured.

  If, for example, a helium leak test is performed after manufacturing the first header tank (2), the lower end of the inlet header component (7A) and the upper end of the outlet header component (7B) and the intermediate plate (9) When there is a brazing defect in the attachment part, leakage of helium to the outside is detected. Therefore, it is possible to easily detect a brazing failure and prevent a decrease in heat exchange performance due to a short circuit between the inlet header (10A) and the outlet header (10B).

  As shown in FIG. 8 and FIG. 9, the heat exchange pipe (4) includes flat upper and lower walls (31) and (32) (a pair of flat walls) facing each other and front and rear of the upper and lower walls (31) and (32). The front and rear side walls (33) and (34) straddling both side edges and the front and rear side walls (33) and (34) span the upper and lower walls (31) and (32) and extend in the longitudinal direction with a predetermined distance from each other. And a plurality of refrigerant walls (4a) arranged in the width direction inside.

  The front side wall (33) has a double structure, and is integrally formed in a raised shape below the front edge of the upper wall (31) and extends over the entire height of the heat exchange pipe (4), and the outer side wall ridge (36), The inner side wall ridges (37) are integrally formed in a bulging shape downward from the upper wall (31) inside the convex ridges (36), and the ridges are integrally formed above the front side edge of the lower wall (32). It consists of the convex for inner side wall (38). The outer side wall ridges (36) are connected to the inner side wall ridges (37) (38) and the lower wall (32) with the lower end engaged with the lower front edge of the lower wall (32). It is attached. Both the inner side wall ridges (37) and (38) are abutted against each other and brazed. The rear side wall (34) is formed integrally with the upper and lower walls (31) (32). A protrusion (38a) extending in the longitudinal direction is integrally formed over the entire length on the front end surface of the inner side wall projection (38) of the lower wall (32), and the inner side wall projection (37) of the upper wall (31) is formed. A concave groove (37a) that extends in the longitudinal direction and into which the protrusion (38a) is press-fitted is formed in the front end surface of

  The reinforcing wall (35) is a reinforcing wall projection (40) (41) integrally formed in a raised shape from the upper wall (31) and a reinforcing wall integrally formed in a raised shape from the lower wall (32). The projecting ridges (42) and (43) are formed by being abutted against each other and brazed. The upper wall (31) and the lower wall (32) are formed with two ridges (40), (41), (42), and (43) for the reinforcing wall alternately in the front-rear direction. The reinforcing wall projections (40) having a high protruding height on the upper wall (31) and the reinforcing wall projections (43) having a low protruding height on the lower wall (32) are brazed, and the upper wall ( The reinforcing wall ridges (41) having a low protruding height in 31) and the reinforcing wall ridges (42) having a high protruding height in the lower wall (32) are brazed. Hereinafter, the ridges (40) and (42) for the reinforcing wall having the high protruding heights of the upper and lower walls (31) and (32) are referred to as the first ridges for the reinforcing wall, respectively, and the ridges for the lower reinforcing wall (41). (43) is referred to as a second reinforcing wall projection. The first reinforcing wall protrusions of the other walls (32) (31) extend in the longitudinal direction on the tip surfaces of the second reinforcing wall protrusions (41) (43) of the upper and lower walls (31) (32). Concave grooves (44) (45) into which the tips of the strips (42) and (40) fit are formed over the entire length, and the first reinforcing wall convex strips (40) and (42) on both the upper and lower walls (31) and (32). ), The reinforcing wall projections (40) (43) and (41) (42) are brazed in a state in which the tip of each of the reinforcing walls is fitted in the concave grooves (45) (44).

  The heat exchange tube (4) is manufactured by using a metal plate (50) for manufacturing a tube as shown in FIG. The metal plate for pipe production (50) is formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides, forming a flat upper wall forming part (51) (flat wall forming part) and a lower wall forming Connecting portion (52) (flat wall forming portion), upper wall forming portion (51) and lower wall forming portion (52) and connecting portion (53) forming rear side wall (34), upper wall forming portion (51) and an inner side wall ridge that is integrally formed in a raised shape above the side edge opposite to the connecting part (53) in the lower wall forming part (52) and forms the inner part of the front side wall (33) ( 37) (38), and an outer side wall ridge forming part (54) formed by extending the side edge of the upper wall forming part (51) opposite to the connecting part (53) outward, A plurality of reinforcing wall ridges integrally formed in a raised shape above the upper wall forming portion (51) and the lower wall forming portion (52) at predetermined intervals in the width direction of the metal plate for pipe manufacture (50) ( 40) (41) (42) (43) The first reinforcing wall protrusions (40) of the upper wall forming part (51), the second reinforcing wall protrusions (43) of the lower wall forming part (52), and the upper wall forming part (51). The second reinforcing wall ridge (41) and the first reinforcing wall ridge (42) of the lower wall forming portion (52) are symmetrical with respect to the center line in the width direction of the connecting portion (53). In position. A protrusion (38a) is formed on the front end surface of the inner side wall ridge (38) of the lower wall forming portion (52), and a concave groove is formed on the front end surface of the inner side wall ridge (37) of the upper wall forming portion (51). 37a) is formed respectively. In addition, the second reinforcing wall projections (41) and (43) of the upper wall forming portion (51) and the lower wall forming portion (52) are provided on the tip surfaces of the second wall forming portions (52) and (51). 1 Grooves (44) and (45) into which the tip ends of the reinforcing wall ridges (42) and (40) fit are formed.

  The aluminum brazing sheet clad with brazing material on both sides is subjected to a rolling process, and the side wall ridges (37) (38) and the reinforcing wall ridges (40) (41) (42) (43) Is integrally molded, so that both side surfaces and tip surfaces of the side wall ridges (37) and (38) and the reinforcing wall ridges (40), (41), (42) and (43), and the second reinforcing wall The inner circumferential surface of the groove (44) (45) of the ridge (41) (43) and the upper and lower surfaces of the upper and lower wall forming portions (50) (51) and the outer side wall ridge forming portion (54) A material layer (not shown) is formed.

  Then, the metal plate for pipe manufacture (50) is sequentially bent at both side edges of the connecting portion (53) by roll forming (see FIG. 10 (b)), and finally bent into a hairpin shape to project the inner side wall. The ridges (37) and (38) are abutted with each other, and the tips of the first reinforcing wall ridges (40) and (42) are connected to the concave grooves (45) of the second reinforcing wall ridges (43) and (41). 44) The projection (38a) is inserted into the concave groove (37a).

  Next, the outer side wall ridge forming part (54) is bent so as to be along the outer surface of the both inner side wall ridges (37) and (38), and its tip part is deformed to form the lower wall forming part (52). To obtain a bent body (55) (see FIG. 10 (c)).

  After that, the bent body (55) is heated to a predetermined temperature, and the tips of the inner side wall ridges (37) and (38), and the first reinforcing wall ridges (40) and (42) and the second reinforcing wall are used. While brazing the tips of the ridges (43) and (41), the outer side wall ridges forming part (54), both inner side wall ridges (37) (38) and the lower wall forming part (52) The heat exchange tube (4) is manufactured by brazing.

  Both ends of the heat exchange pipe (4) are inserted into the pipe insertion holes (18) of the inner plates (8) of both header tanks (2) (3) and the communication holes (22) of the intermediate plate (9), respectively. In addition, the brazing material layer of the inner plate (8) and the brazing material layer of the metal plate for pipe production (50) described above are used with its end face in contact with the step (25) of the intermediate plate (9). The inner peripheral surface of the pipe insertion hole (18) of the inner plate (8) and the communication hole (22) of the intermediate plate (9) are brazed.

  Therefore, the right end portion of the plurality of heat exchange tubes (4) in the upper half is connected to the first header tank (2) so as to communicate with the side outward bulging portion (11A) of the inlet header component (7A), The left end portion is connected to the second header tank (3) so as to communicate with the outward bulge portion (24). In addition, the right end of the heat exchange pipes (4) in the lower half is connected to the first header tank (2) so as to communicate with the lower outer bulge (11B), and the left end is bulged outward. It is connected to the second header tank (3) so as to communicate with the part (24).

  The corrugated fin (5) is formed in a wavy shape using a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet.

  The gas cooler (1) prepares the above-described two temporary fixing bodies, the plurality of above-described bent bodies (55), and the plurality of corrugated fins (5) when the header tanks (2) and (3) are manufactured. That the two temporary fixing bodies are arranged at an interval so that the inner plates (8) face each other, the plurality of folding bodies (55) and the corrugated fins (5) are arranged alternately, the folding Both ends of the body (55) are inserted into the tube insertion holes (18) of the inner plates (8) of both temporary fixing bodies and the communication holes (22) of the intermediate plate (9), and the end faces thereof are inserted into the intermediate plate (9 ), The side plate (6) is disposed outside the corrugated fins (5) at both ends, and the inlet header component (7A) forming the first header tank (2) And arranging the inlet member (13) and the outlet member (16) in the outwardly bulging portions (11A) (11B) of the outlet header component (7B), and The required part of the stopper is brazed as described above to form the header tank (2) (3), and at the same time, the necessary part of the bent body (55) is brazed as described above to heat-exchange pipe (4). Furthermore, the heat exchange pipe (4) is connected to the header tank (2) (3), the fin (5) is connected to the heat exchange pipe (4), the side plate (6) is connected to the fin (5), and the inlet member ( 13) and the outlet member (16) are manufactured by brazing the outward bulges (11A) and (11B), respectively.

  The gas cooler (1) constitutes a supercritical refrigeration cycle together with an intermediate heat exchanger that exchanges heat between the refrigerant that has come out of the compressor and the evaporator, the decompressor and the gas cooler and the refrigerant that has come out of the evaporator. For example, it is installed in a car.

In the above-described gas cooler (1), high-temperature and high-pressure CO ₂ that has passed through the compressor passes through the refrigerant inflow passage (14) of the inlet member (13) from the refrigerant inlet (12) to the inlet of the first header tank (2). Enters the header (10A), divides, and flows into the refrigerant passages (4a) of all the heat exchange pipes (4) communicating with the outer bulging portion (11A) of the inlet header component (7A) . The CO ₂ flowing into the refrigerant passage (4a) flows leftward in the refrigerant passage (4a) and flows into the intermediate header (20) of the second header tank (3). The CO ₂ that has flowed into the outward bulging portion (24) flows downward through the inside and the communicating portion (33) of the intermediate plate (9), and is diverted to the outward expansion of the outlet header component (7B). The refrigerant flows into the refrigerant passages (4a) of all the heat exchange pipes (4) communicating with the outlet (11B), changes the flow direction and flows to the right in the refrigerant passages (4a) to the first header tank ( Enter the exit header (10B) of 2). Thereafter, CO ₂ flows out through the refrigerant outlet (15) and the refrigerant outlet path (17) of the outlet member (16). Then, while CO ₂ flows in the refrigerant passage (4a) of the heat exchange pipe (4), the ventilation gap is heat-exchanged with the air flowing in the direction indicated by the arrow X in FIG.

  And according to the above-mentioned two combinations of the alloy forming the inlet header component (7A) and the alloy forming the outlet header component (7B), the inlet of the outer plate (7) of the first header tank (2) Since the strength in the operating temperature range of the gas cooler (1) in the header component (7A) can be sufficiently higher than the strength in the operating temperature range of the gas cooler (1) in the outlet header component (7B), The pressure resistance of the inlet header (10A) is excellent. Also, the corrosion of the inlet header component (7A) is suppressed by sacrificing the outlet header component (7B) with respect to the inlet header component (7A), and as a result, the inlet header component (7A) It is possible to prevent a decrease in strength due to the progress of corrosion.

Embodiment 2
This embodiment is shown in FIG. 11 and FIG.

  In the case of this embodiment, the inlet header component (70A) and the outlet header component (70B) of the outer plate (7) of the first header tank (2) are made of the same material. That is, the inlet header component (70A) and the outlet header component (70B) each press the aluminum brazing sheet in which both surfaces of the same aluminum core are covered with the same aluminum brazing material. The core material and the skin material are made of the same material as the outlet header component (7B) of the first embodiment. Further, the wall thickness of the inlet header component (70A) is 5 to 30% thicker than the wall thickness of the outlet header component (70B), thereby the gas cooler (1) in the inlet header component (70A). The strength in the operating temperature range, for example, 150 to 180 ° C., is 10 to 50% higher than the strength in the temperature range of the outlet header component (70B).

  Further, since the wall thickness of the inlet header component (70A) is thicker than the wall thickness of the outlet header component (70B), the width of the upper part of the covering wall (19) of the inner plate (8) is lower. It is larger than the width. The wide portion (19a) of the covering wall (19) is brazed to the front and rear side surfaces of the upper portion of the inlet header component (70A) and the intermediate plate (9).

  Other configurations are the same as those of the gas cooler of the first embodiment.

In the above two embodiments, CO ₂ is used as the supercritical refrigerant in the supercritical refrigeration cycle. However, the present invention is not limited to this, and ethylene, ethane, nitric oxide, or the like can be used.

  Furthermore, in the above two embodiments, the heat exchange pipe (4) is composed of a bent body (55) obtained by bending a metal plate for pipe production made of an aluminum brazing sheet having a brazing filler metal layer on both sides. For example, it may be made of an aluminum extruded shape having a brazing filler metal layer on the outer peripheral surface.

1 is a perspective view showing an overall configuration of Embodiment 1 of a gas cooler to which a heat exchanger according to the present invention is applied. FIG. 2 is a partially omitted vertical sectional view of the gas cooler of FIG. It is a perspective view which shows the 1st header tank of the gas cooler of FIG. It is an AA line expanded sectional view of FIG. FIG. 3 is an enlarged sectional view taken along line B-B in FIG. 2. It is a disassembled perspective view which shows the 1st header tank of the gas cooler of FIG. It is a disassembled perspective view which shows the 2nd header tank of the gas cooler of FIG. It is a cross-sectional view which shows the heat exchange pipe | tube of the gas cooler of FIG. It is the elements on larger scale of FIG. It is a figure which shows the manufacturing method of the heat exchange pipe | tube shown in FIG. It is a perspective view which shows the 1st header tank of Embodiment 2 of the gas cooler to which the heat exchanger by this invention is applied. It is a disassembled perspective view which shows the 1st header tank of the gas cooler of FIG.

Explanation of symbols

(1): Gas cooler (heat exchanger)
(2) (3): Header tank
(4): Heat exchange pipe
(7): Outer plate
(7A): Entrance header component
(7B): Exit header component
(8): Inside plate
(9): Intermediate plate
(10A): Entrance header
(10B): Exit header
(11A) (11B): outward bulge
(18): Tube insertion hole
(22): Communication hole
(23): Communication part
(24): Outward bulge
(70A): Entrance header component
(70B): Exit header component

Claims (24)

Each header includes a pair of header tanks arranged at a distance from each other, and a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks. The tank is configured by laminating and brazing an outer plate, an inner plate, and an intermediate plate interposed between the two plates, and is arranged in the length direction of the first header tank. In the heat exchanger in which a plurality of headers are provided and the header at one end in the length direction of the first header tank is an inlet header having a refrigerant inlet,
The heat exchanger by which the 1st header structure part which comprises the inlet header in the outer side plate of a 1st header tank is divided | segmented from the 2nd header structure part which comprises the header adjacent to this. 2. The heat exchanger according to claim 1, wherein the heat exchanger operating temperature range strength of the first header component in the outer plate of the first header tank is higher than the heat exchanger operating temperature range strength of the second header component. . The first header component and the second header component in the outer plate of the first header tank are made of the same material, and the thickness of the first header component is 5 to 5 times the thickness of the second header component. The heat exchanger according to claim 2, wherein the heat exchanger is 30% thick. The thickness of the first header component and the second header component in the outer plate of the first header tank is the same, and the heat exchanger operating temperature strength of the first header component is the heat of the second header component. The heat exchanger according to claim 2, wherein the heat exchanger is 10 to 50% higher than the strength of the use temperature range of the exchanger. The first header component and the second header component on the outer plate of the first header tank are each formed of an aluminum alloy containing Mn, Cu, Si and Mg, and Mn, Cu, Si of the first header component 5. The heat exchanger according to claim 4, wherein the content of at least one of Mg and Mg is greater than the content of the same type of element in the second header component. The heat exchanger according to claim 5, wherein the Mn content in the first header component is 0.1 mass% or more than the Mn content in the second header component. The heat exchanger according to claim 5 or 6, wherein the Cu content of the first header component is 0.05 mass% or more higher than the Cu content of the second header component. The heat exchanger according to any one of claims 5 to 7, wherein the Si content of the first header component is 0.1 mass% or more than the Si content of the second header component. The heat exchanger according to any one of claims 5 to 8, wherein the Mg content of the first header component is 0.05 mass% or more than the Mg content of the second header component. The first header component in the outer plate of the first header tank is Mn 0.8 to 1.7 mass%, Cu 0.15 to 0.5 mass%, Si 0.4 to 1.7 mass%, Mg 0.05 to 1 The heat exchanger according to any one of claims 5 to 9, wherein the heat exchanger is formed of an aluminum alloy including the remaining mass and the balance Al and inevitable impurities. 11. The first header component in the outer plate of the first header tank has a proof stress in a temperature range of 150 to 180 ° C. of 50 MPa or more and a tensile strength of 100 MPa or more. 11. Heat exchanger. 5. The heat according to claim 1, wherein the first header component on the outer plate of the first header tank is more noble than the second header component, and the potential difference between both header components is 30 mV or more. Exchanger. The first header component and the second header component in the outer plate of the first header tank are each formed of an aluminum alloy containing Mn, Cu and Si, and among the Mn, Cu and Si of the first header component The heat exchanger according to claim 12, wherein the content of at least one of is greater than the content of the same kind of element in the second header component. The heat exchanger according to claim 13, wherein the Mn content in the first header component is 0.1 mass% or more than the Mn content in the second header component. The heat exchanger according to claim 13 or 14, wherein the Cu content of the first header component is 0.05 mass% or more higher than the Cu content of the second header component. The heat exchanger according to any one of claims 13 to 15, wherein the Si content of the first header component is 0.1 mass% or more than the Si content of the second header component. The first header component in the outer plate of the first header tank contains Mn 0.8 to 1.7 mass%, Cu 0.15 to 0.5 mass%, Si 0.4 to 1.7 mass%, the balance Al and The heat exchanger according to any one of claims 13 to 16, wherein the heat exchanger is formed of an aluminum alloy made of inevitable impurities. The 2nd header structure part in the outer side plate of a 1st header tank consists of JIS A3003, and a 1st header structure part is Mn1.2-1.7 mass%, Cu0.1-0.5 mass%, Si0.15-. The heat exchanger according to claim 12, wherein the heat exchanger is formed of an aluminum alloy containing 1.7% by mass, the balance being Al and inevitable impurities. The second header tank is provided with a header that is one less than the number of headers in the first header tank so as to straddle two adjacent headers in the first header tank, opposite to the inlet header of the first header tank. The header at the end on the side is an outlet header, and all the heat exchange tubes are composed of a plurality of heat exchange tubes arranged continuously in the length direction of the header tank, and the number of headers of the first header tank The heat exchanger according to claim 1, wherein the heat exchanger is divided into the same number of paths. The first header tank is provided with two headers, the header adjacent to the inlet header is an outlet header, and the outer plate constituting the first header tank is composed of an inlet header component and an outlet header configuration. The heat exchanger according to claim 19, wherein the heat exchanger is divided into two parts. Outer bulges are formed on the outer plates of both header tanks, extending in the length direction and closed by the intermediate plate, and the portions corresponding to the outer bulges of both header tanks are the headers. The heat exchanger according to any one of claims 1 to 20. A compressor, a gas cooler, an evaporator, a decompressor, and a refrigeration cycle that includes an intermediate heat exchanger that exchanges heat between the refrigerant that has come out of the gas cooler and the refrigerant that has come out of the evaporator, and uses a supercritical refrigerant, A supercritical refrigeration cycle, wherein the gas cooler comprises the heat exchanger according to any one of claims 1 to 21. The supercritical refrigeration cycle according to claim 22, wherein the supercritical refrigerant comprises carbon dioxide. 24. A vehicle on which the supercritical refrigeration cycle according to claim 22 or 23 is mounted as a car air conditioner.

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