JPH0322459B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD This invention relates to an aluminum heat exchanger used, for example, in a car cooler evaporator or a car cooler condenser. Prior art and its problems For example, aluminum heat exchangers are used as evaporators for car coolers because they are lightweight and have good thermal conductivity. For example, as shown in FIG. 1, an aluminum heat exchanger has a plurality of straight pipe sections 1a arranged parallel to each other.
A heat exchange tube 1 consisting of a serpentine flat tube made of an extruded aluminum material and having a plurality of refrigerant passages formed in parallel inside thereof, and an adjacent straight tube section 1a of the heat exchange tube 1. an aluminum corrugated fin 2, an aluminum inlet header 3 connected to one end of the heat exchange tube 1, and an aluminum outlet header 4 connected to the other end of the heat exchange tube 1. One end of a heat medium inlet pipe 5 made of extruded aluminum material for supplying a heat medium is connected to the inlet side header 3 of the heat exchanger main body, and a heat medium outlet pipe 6 made of extruded aluminum material for sending out the heat medium is connected to the outlet side header 4. one end of which is connected. This heat exchanger includes a heat exchange tube 1 and fins 2.
It is manufactured by collectively brazing the inlet side and outlet side headers 3 and 4, the heat medium inlet pipe 5, and the heat medium outlet pipe 6. Note that in some cases, the heat exchanger main body does not include an inlet header and an outlet header, and the inlet pipe and the outlet pipe are directly connected to the heat exchange pipe. As shown in FIG. 2, a female cylindrical joint member 10 consisting of a conduit connecting cap nut with a hole 8 formed in the top wall 7 is rotatably fitted onto the distal end side of the heat medium inlet pipe 5. ing. A bead 11 that engages with the inner surface of the top wall 7 of the female cylindrical joint member 10 is formed near the tip of the heat medium inlet pipe 5 . A male cylindrical joint member 14 having a male thread 13 formed on its outer peripheral surface is fitted onto the tip of the heat medium outlet pipe 6 so as not to come off. A male cylindrical joint member 22 is fixed to the end of the conduit 20 to be connected to the heat medium inlet pipe 5, and the male cylindrical joint member 22 has a male thread 21 formed on its outer circumferential surface that engages with the female thread 9 of the cap nut 10. By screwing together the cylindrical joint member 10 and the male cylindrical joint member 22, the heat medium inlet pipe 5 and the conduit 20 are connected. Although not shown, a female cylindrical joint member made of a cap nut with a hole in the top wall is installed at the end of the conduit to be connected to the heat medium outlet pipe 6 to prevent it from coming off from the end of the conduit. The female cylindrical joint member and the male cylindrical joint member 14 are screwed together to connect the heat medium outlet pipe 6 and the conduit. . Conventionally, the heat medium inlet pipe 5 and heat medium outlet pipe 6 of the heat exchanger are made of JISA1100 or
Those extruded from JISA3003 were used. Furthermore, for the same reason as mentioned above, those made of JISA1100 or JISA3003 were used as the other heat exchange tubes 1, corrugated fins 2, inlet side header 3, and outlet side header 4. However, in the case of the heat medium inlet pipe 5 and the heat medium outlet pipe 6,
If it is made of JISA1100 or JISA3003, the strength after brazing will be reduced due to heating during brazing, and as mentioned above, tightening torque will be applied when connecting to the conduit 20, resulting in twisting or bending. There was a problem. In particular, in the case of the heat medium inlet pipe 5, there was a problem that the bead 11 was crushed. Furthermore, there was a problem in that it easily bent when force was applied after brazing. An object of the present invention is to provide an aluminum heat exchanger that solves the above problems. Means for Solving the Problems The aluminum heat exchanger according to the present invention includes an aluminum heat exchanger body formed by brazing a plurality of parts, and an aluminum heat exchanger body that is brazed to the heat exchanger body. It consists of a heat medium inlet pipe that supplies the heat medium to the heat exchange tube of the heat exchanger body, and a heat medium outlet pipe that sends the heat medium out from the heat exchange tube, and a hole is formed in the top wall at the tip of the heat medium inlet tube. A female cylindrical joint member made of a conduit connecting cap nut is rotatably fitted over the heat medium inlet pipe, and a bead that engages with the inner surface of the top wall of the female cylindrical joint member is provided near the tip of the heat medium inlet pipe. A male cylindrical joint member with a male thread formed on the outer peripheral surface is fixed to the tip of the heat medium outlet pipe, and the heat medium inlet pipe and the heat medium outlet pipe are collectively connected together with the parts constituting the heat exchanger body. The heat exchanger is made of aluminum and is brazed. and
It is made of an aluminum alloy containing less than 0.6 wt%, with the remainder consisting of aluminum and unavoidable impurities. In the above, manganese and magnesium are
By incorporating both of these into aluminum, it improves processability such as beading and bending, corrosion resistance,
It has the property of improving brazing properties and strength after brazing without impairing extrusion processability, etc., but the above effects are not obtained when the manganese content is less than 1.0wt% and the magnesium content is less than 0.2wt%. The strength after brazing will be reduced. In addition, if the manganese content exceeds 1.5wt%, the extrusion processability when extruding a pipe becomes poor, and if the magnesium content exceeds 0.6wt%, the extrusion processability when extruding a pipe becomes poor. At the same time, there is a risk that brazing defects may occur. Therefore, the manganese content is 1.0-1.5wt%, and the magnesium content is
It should be selected within the range of 0.2wt% or more and less than 0.6wt%. Especially in the case of magnesium, 0.3~
It is preferably within the range of 0.5wt%. 0.5wt%
This is because if it exceeds this, there is a risk that the brazing properties will be slightly reduced. Further, the tube material may contain unavoidable impurities such as Fe, Cu, Si, Ti, and Zn to an extent that does not affect its characteristics. The heat medium inlet pipe, the heat medium outlet pipe, and the header or heat exchange pipe are brazed together with other members by vacuum brazing, furnace brazing, non-corrosive flux brazing, or the like. Examples Examples of the present invention will be described below along with comparative examples. Table 1 shows the alloy composition of the aluminum alloy forming the heat medium inlet pipe 5 and the heat medium outlet pipe 6. Then, in order to evaluate the performance of each alloy, the brazing properties and extrusion processability of each alloy were investigated. Also,
Among each alloy, those with good extrudability are
Test pieces were created for each, heated at 600°C for 15 minutes, and then measured for tensile strength, yield strength, and elongation. These results are shown in Table 2.

【table】

[Table] Effects of the invention According to the aluminum heat exchanger of this invention,
The heat medium inlet pipe and the same outlet pipe contain manganese from 1.0 to
Contains 1.5wt% and 0.2wt magnesium
% or more and less than 0.6wt%, and the balance is aluminum and unavoidable impurities. It has excellent properties and has high strength after brazing. Therefore, the risk of twisting or bending when connecting a conduit to a pipe is prevented. Furthermore, the bead that engages with the inner surface of the top wall of the female cylindrical joint member in the heat medium inlet pipe is prevented from being crushed. Moreover, it has good extrusion processability,
The tube is easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a front view of an aluminum heat exchanger, and FIG. 2 is a partially enlarged longitudinal cross-sectional view showing a heat medium inlet pipe and a connecting end of a conduit connected thereto. DESCRIPTION OF SYMBOLS 1... Heat exchange tube, 5... Heat medium inlet pipe, 6... Heat medium outlet pipe, 7... Top wall, 8... Hole, 10... Female cylindrical joint member, 11... Bead, 13... Male thread, 14... Male type Cylindrical joint member.

Claims (1)

[Claims] 1 An aluminum heat exchanger body formed by brazing multiple parts, and a heat medium inlet that is brazed to the heat exchanger body and supplies a heat medium to the heat exchange tubes of the heat exchanger body. It consists of a pipe and a heat medium outlet pipe that sends out the heat medium from the heat exchange pipe, and at the tip of the heat medium inlet pipe there is a rotating female cylindrical joint member consisting of a conduit connecting cap nut with a hole formed in the top wall. A bead is formed near the tip of the heat medium inlet pipe to engage with the inner surface of the top wall of the female cylindrical joint member, and a male thread is formed on the outer peripheral surface of the heat medium outlet pipe. An aluminum heat exchanger in which the formed male cylindrical joint member is fixed, and the heat medium inlet pipe and heat medium outlet pipe are brazed together with the parts constituting the heat exchanger body. The heat medium inlet pipe and the heat medium outlet pipe are aluminum alloys containing 1.0 to 1.5 wt% manganese, 0.2 wt% or more and less than 0.6 wt% magnesium, and the balance being aluminum and inevitable impurities. Aluminum heat exchanger made of.