KR100630320B1 - Laminate type heat exchanger assembly - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger assembly for an automotive air conditioner, and more particularly, to a laminated heat exchanger assembly including an inlet / outlet pipe for inlet and outlet of a heat exchange fluid. The present invention relates to a laminated heat exchanger assembly having a notch portion capable of absorbing and exhausting a moment generated from an inlet / outlet pipe by a worker in an assembly process and the like as strain energy.

The present invention, a plurality of heat exchange tube (1) laminated and communicating with each other; A manifold (2) interposed between the heat exchange tubes and in communication with the heat exchange tubes, the one side having an access portion 21 for entering and exiting the heat exchange fluid; At least one or more fixed end (3a) is fitted to the entrance and exit of each manifold, plastic deformation prior to the other part when the moment occurs in the inlet / outlet pipe (3) of the fixed end around the intermediate outer peripheral surface It comprises an inlet / outlet pipe (3) having a notch 30, the separation distance (l) to the fixed end (3a) of the notch 30 is the horizontal of the inlet / outlet pipe (3) It characterized in that the range of 30% to 60% of the part length (L), according to this configuration, the notch portion 30 blocks the moment generated in the inlet / outlet pipe by the operator when transporting or assembling the heat exchanger assembly By preventing damage to the coupling portion (A) of the manifold and the inlet / outlet pipe, it is possible to greatly reduce the failure rate that occurs after the assembly process.

 Stacked, Heat Exchangers, Heaters, Manifolds, Pipes

Description

Multilayer Heat Exchanger Assembly {LAMINATE TYPE HEAT EXCHANGER ASSEMBLY}

1 is a front view of a typical stacked heat exchanger assembly.

Figure 2 is a cross-sectional view taken along the line II-II of Figure 1 of the coupling structure between the manifold and the inlet / outlet pipe of the conventional heat exchanger assembly.

Figure 3 is an enlarged exploded perspective view showing a coupling structure between the manifold and the inlet / outlet pipe of the laminated heat exchanger assembly according to an embodiment of the present invention.

4 is a cross-sectional view taken along line II-II of FIG. 1 showing a coupling structure between a manifold and an inlet / outlet pipe of a stacked heat exchanger assembly according to an embodiment of the present invention.

Figure 5 is a graph showing the stress generated on the inlet / outlet pipe when forced displacement on the free end of the inlet / outlet pipe of the conventional heat exchanger assembly.

6 is a graph showing stress generated in an inlet / outlet pipe having one notch as one embodiment of the present invention.

7 is a graph showing stresses occurring in an inlet / outlet pipe having two notches as another embodiment of the present invention.

FIG. 8 is a graph showing stress generated in an inlet / outlet pipe having three notches as another embodiment of the present invention. FIG.

9 is a graph showing a change in stress of a fixed end according to the location of the notch in an inlet / outlet pipe having one notch as an embodiment of the present invention.

10 is a graph showing a change in stress of a fixed end according to the position of the notch in an inlet / outlet pipe having one notch and a horizontal portion having a length of 100 mm as an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: heat exchanger tube 2: manifold

21: entrance part 2a, 2b: left, right plate

3: inlet / outlet pipe 30: notch part

3a: fixed end A: coupling part of manifold and inlet / outlet pipe

P: Point where the inlet / outlet pipe is bent

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger assembly for an automotive air conditioner, and more particularly, to a laminated heat exchanger assembly having inlet / outlet pipes for inlet and outlet of heat exchange fluid, wherein the heat exchanger assembly is assembled to the inlet and outlet pipes. The present invention relates to a multilayer heat exchanger assembly having a notch portion that absorbs and exhausts moments generated at an inlet / outlet pipe by a worker in a process and prevents damage to the joint between the inlet / outlet pipe and the manifold entrance. .

A car air conditioner is a vehicle interior that is installed to cool or heat a car interior in summer or winter, or to remove frost from a windshield during rainy or winter seasons. At the same time, by selectively introducing outside air or bet from outside or inside the car, the air is cooled or heated, and then blown into the inside of the car to cool, heat or ventilate the inside of the car. Or remove the frost from Wind Shield Glass.

That is, the air conditioner of an automobile includes a blower (Blower) that selectively introduces and blows inside and outside air in a case communicating interior and exterior of the vehicle, and an evaporator which is heat exchangers for cooling or heating the air blown by the blower ( Built-in evaporator, heater, and temperature control door to adjust the ratio of the amount of air flowing into the heater, and selectively introduces indoor or outdoor air by the blower, and then introduces the air into the case. It is a device for cooling, heating or ventilating the interior of the vehicle by cooling or heating with the evaporator and the heater and then discharging it to the interior of the vehicle while selectively passing the heater through the evaporator installed in the temperature control door.

In such an air conditioner, heat exchangers such as an evaporator and a heater are disposed in a lateral direction on a blower path formed by an air conditioning case while forming a configuration of a circulation cycle through which heat exchange fluid (refrigerant or cooling water) is circulated. Iii) a heat exchanger that heats or cools the air blown through the blower by heat exchange with the heat exchange fluid, and is arranged in the cross-sectional direction of the blower in the air conditioning case (not shown) as shown in FIG. And a plurality of heat exchange tubes (1) communicating with each other through the tank parts (11) of each upper end to distribute the heat exchange fluid flow paths evenly on the cross section of the air passage, and interposed between the heat exchange tubes (1). A plurality of heat exchange fins 4 for enlarging the heat transfer area of the tube and the flow paths are stacked together with the heat exchange tubes 1 to communicate with the heat exchange tubes 1. It consists of two manifolds (not shown) to form an inlet chamber and an outlet chamber. Each of the manifolds includes an inlet pipe or an outlet pipe connecting the manifolds to other components forming a heat exchange fluid circulation cycle such as a water jacket (not shown), an expansion valve (not shown), or a compressor (not shown). The inlet / outlet pipes 3 are integrated in the brazing process to form a single assembly which is a unit of logistics and assembly.

According to this configuration, the laminated heat exchanger assembly flows the heat exchange fluid circulating through the heat exchange fluid circulation cycle into one side manifold through the inlet and outlet pipes 3 on one side, and is distributed evenly along the heat exchange tubes 1 and then discharged. By discharging through the inlet / outlet pipes 3 of the other manifold of the dragon, the heat exchange fluid flows through the heat exchange tubes 1 to exchange heat with the air discharged into the vehicle interior, thereby heating the air discharged into the vehicle interior, or To cool.

In the configuration of the stacked heat exchanger assembly which functions as described above, each manifold (2) connected by an inlet / outlet pipe (3) to another heat exchange fluid circulation cycle configuration outside the air conditioner case (not shown) As can be seen from the cross-sectional view of Fig. 2, the two tank portions 22 and 23 each having a smooth heat exchange passage portion 26 and tank holes 22a and 23a at each upper end of the passage portion, respectively. The two plates 2a and 2b, which are formed side by side, face each other and are joined to each other (see FIG. 3), and the inlet / outlet pipe 3 is connected to the tank portion 22 in one tank portion 22. An entrance portion 21 for connection is extended and molded in one horizontal direction. Reference numeral 28 denotes beads that are embossed on the heat exchange passage 26 to enlarge the heat transfer area of the heat exchange passage 26, and 29 denotes an increase in the engagement force of the entry portion 21 with respect to the inlet / outlet pipe 3. Spacer.

On the other hand, the laminated heat exchanger is transported in an assembly state in which the inlet / outlet pipes 3 are coupled to the manifold 2 or mounted in the air conditioner, in which a worker generally grabs the inlet / outlet pipes 3 and exchanges heat. The assembly will be transported or assembled. In this case, a bending moment is applied to each inlet / outlet pipe 3 by an operator when carrying or assembling a laminated heat exchanger, thereby coupling between the inlet and outlet 21 of each manifold 2 and the inlet / outlet pipe 3. In the part A, a strong stress is generated by the bending moment of the inlet / outlet pipe 3. Furthermore, the middle part of the inlet / outlet pipe 3 is bent in the form of a translator, and the distance from the bending point P to the free end 3b is longer than the distance to the fixed end 3a, so that the fixed end 3a side Because a greater moment acts on the joint A of the inlet / outlet pipe 3 and the inlet / outlet 2, a very large stress is generated even by a small external force acting on the free end 3b.

However, since the conventional laminated heat exchanger assembly does not have a countermeasure such as a structure that can reduce the moment of the inlet / outlet pipe 3 or can alleviate the stress, which can cope with the stress as described above, When assembling, there is a problem that deformation or cracking occurs easily at the joint part A of the inlet / outlet pipe 3 and the inlet part 21 which is relatively weak even by a small moment acting on the inlet / outlet pipe 3. there was. The problem is that the entire heat exchanger tube 1, the manifold 2 for inlet / outlet of the heat exchange fluid, and the inlet / outlet pipe 3, etc. are integrated in the welding process, thereby deteriorating the entire stacked heat exchanger assembly. It caused a problem of raising the manufacturing cost of.

As described above, in the conventional laminated heat exchanger assembly, the main part of the defect is because the coupling part between the inlet / outlet pipe 3 and the inlet part 21 is deformed or cracks occur in the part during assembly or transportation. It has been a factor to unnecessarily increase the cost of manufacturing phosphorus and heat exchangers.

The present invention can solve the problems of the manifold for the conventional laminated heat exchanger as described above, a plurality of laminated heat exchange tubes, a manifold interposed therebetween, and an inlet / outlet pipe coupled to the manifold In the laminated heat exchanger assembly which is integrally formed by the welding process, the moment of the inlet / outlet pipe generated by the worker in the process of assembling the heat exchanger assembly on the inlet / outlet pipe is exhausted on the inlet / outlet pipe and thus relatively weak inlet. It is an object to provide a stacked heat exchanger assembly in which the joining of the outlet pipe and the inlet and outlet is not easily deformed or damaged by the moment of the inlet and outlet pipe.

Laminated heat exchanger assembly according to the present invention devised for the above object, a plurality of heat exchange tubes are laminated to communicate with each other through a tank portion formed on the top to sequentially induce heat exchange fluid; At least two manifolds interposed between the heat exchange tubes and in communication with the heat exchange tubes, the at least two manifolds having an entrance part for introducing and discharging the heat exchange fluid on one side thereof; Fixed ends) are inserted into and coupled to the manifold, and at the time of generating moments at the free ends opposite to the fixed ends, plastic deformation takes precedence over other portions to absorb and dissipate the moments as plastic strain energy. It comprises an inlet / outlet pipe having at least one notch, wherein the separation distance to the fixed end of the notch is characterized in that 30% to 60% of the length of the horizontal portion of the inlet / outlet pipe.

delete

The separation distance with respect to the fixed end of the notch portion may be more preferably in the range of 35% to 45% of the length of the horizontal portion of the inlet / outlet pipe.

Hereinafter, a preferred embodiment of the present invention looks at in more detail through the accompanying drawings.

In describing the embodiments of the present invention, for the sake of clarity, the same reference numerals are used for the same configurations of the present invention as those of the prior art.

Stacked heat exchanger assembly according to an embodiment of the present invention, the plurality of heat exchange tubes (1) stacked to communicate with each other, interposed between the heat exchange tubes (1) to communicate with the heat exchange tubes (1), General laminar heat exchanger assembly such as two manifolds (2) having an entry portion (21) on one side for introducing and discharging the heat exchange fluid, and an inlet / outlet pipe (3) respectively coupled to each of the manifold entrances and exits. 1 and 2, in particular, the inlet / outlet pipe 3 has a strain energy generated by an external force acting on the free end 3b side of the pipe 3 as a strain energy. It further comprises a notch 30 that can be absorbed and exhausted.

FIG. 3 is an exploded perspective view showing the configuration of the inlet / outlet pipe 3 having the notch 30 and the manifold 2 to which the inlet / outlet pipe 3 is coupled, and the joining structure therebetween.

As shown, the manifold 2 of the heat exchanger is formed by joining two plates 2a and 2b, which are aluminum molded articles having a structure symmetrical to each other, to smooth each plate 2a and 2b. A heat exchange passage part 26 which is a surface, two tank parts 22 and 23 recessed side by side at an upper end thereof, and an entrance part having a hemispherical cross section extending outwardly from one tank 22 of the two tanks ( 21, a partition bead 24 protruding downwardly between the two tank portions 22 and 23, and a joint 27 raised in a flange form along an edge thereof, so that they The joint part 27 and the partition bead 24 which are mutually contacted through the brazing process after being butted are welded, respectively, so that one side tank part 22 is provided between the heat exchange path parts 26 of the plates 2a and 2b facing each other. Bypass the compartment bead 24 from the other tank portion (23) A manifold 2 is formed which forms a flow path leading to).

Each of the manifolds 2 is interposed between the heat exchange tubes 1 to communicate with adjacent heat exchange tubes 1 through the tank sections 22 and 23 tank holes 22a and 23a at the upper end thereof. As the inlet / outlet pipes 3 are respectively coupled to the inlet / outlet portions 21 extending from the one side tank portions 22, the heat exchanger forms a flow path that evenly distributes the heat exchange fluid in the cross-sectional direction of a blower (not shown). The tube (1) serves as an inlet and outlet chamber for introducing and discharging the heat exchange fluid.

In addition, the inlet / outlet pipe 3 has a thickness that is slightly thicker than that of the mating partner manifold plates 2a and 2b, and is extruded and molded to form an approximately tracer that is coupled to the entrance 21 of the manifold 2. As a bent cylindrical tube (see FIG. 1), as shown in FIG. 4, the fixed end 3a of one end thereof is fitted into the entrance 21 of the manifold 2, and then the manifold 2 is subjected to a brazing process. ) Is combined. On this inlet / outlet pipe 3, it is located between the fixed end 3a and the bent point P, and when the inlet / outlet pipe 3 receives a moment during logistics or assembly work, the moment itself The notch part 30 absorbed and exhausted by the strain energy according to the plastic deformation is molded.

As shown in Figs. 3 and 4, the notch portion 30 is stressed by the moment of the inlet / outlet pipe 3 to concentrate on the notch portion 30 so as to plastically deform the other portions. It has a structure recessed along the outer circumferential surface of the pipe (3). Then, at a position spaced apart from the fixed end 3a by a distance corresponding to 35% to 45% of the horizontal portion length L of the inlet / outlet pipe 3 between the fixed end 3a and the bent point P. Molded.

The preferred separation distance l with respect to the fixed end 3a of the notch portion 30 is a mouth with a thickness of 1.2 mm with a horizontal length of 40 mm from the fixed end 3a combined with the manifold 2 to the bent point. Assuming that the horizontal portion of the outlet pipe 3 (part from the fixed end 3a) to the bent point P is a cantilever, the point P is changed while changing the position and quantity of the notch 30. The stress generated at each position of the pipe (3) when applying a force of 0.5 mm in the vertical force displacement is calculated as a result of the structural analysis.

For reference, according to the result of the structural analysis, when the notch 30 is not formed in the inlet / outlet pipe 3, as shown in FIG. 5, the stress generated at each position of the pipe 3 is In the case of forming one notch 30 at a point 25 mm apart from the point P, the stress is increased in the notch portion 30 as it goes to the fixed end 3a. ) Peaked at the apex and rapidly changed around it. 7 and 8, when two or three notched portions 30 were formed, the stress concentration phenomenon was prominent in the notched portion 30 near the fixed end 3a side. This is a physical phenomenon that appears because the moment is increased closer to the fixed end (3a) (3b) of the inlet / outlet pipe (3).

However, together with the structural analysis results as described above, instead of forming only one notch 30, a forced displacement is applied to the pipe 3 while changing the relative position with respect to the fixed end of the notch 30. According to the result of the analysis of the results of the structural analysis that measured the stress generated at each position of (3), the effect of the notch part 30 is relative to the inlet / outlet pipe 3 rather than the quantity of the notch part 30. More relevant to the location.

FIG. 9 is a graph of the result, which shows an entry / exit pipe 3 having a thickness of 1.2 mm and a horizontal length L in the extension direction of the manifold 2 entrance 21. The notched part 30 is moved from the fixed end 3a to the bent point P on the horizontal portion of the fixed part 3a, and the fixed end 3a is generated as a result of the forced displacement of 5 mm at the point P, respectively. Of the pipe 3 without the notch 30 is compared with the stress generated at the fixed end 3a of the pipe 3 of the same standard without the notch 30 by the forced displacement of the same size. The stress generated at the fixed end 3a is set at 100% and the ratio of the fixed end 3a stress of the pipe 3 having the notch 30 therewith is notched to the pipe 3 horizontal length L. It is shown by the correlation with the spacing distance (l) ratio of (30).

As can be seen from this graph, when a moment acts on the inlet / outlet pipe 3, the stress generated at the fixed end 3a of the pipe 3 is determined by the position of the notch 30 at the fixed end 3a. ) Gradually decreases as it moves toward the bent point (P), and becomes a minimum when it is separated by a distance corresponding to about 40% of the total horizontal length (L) of the pipe (3), and then gradually increases again thereafter. Showed. After that, the stress generated at the fixed end 3a again increases little by little further from the fixed end 3a. From the result of the stress measurement, whether the notch 30 has one or more, the separation distance l from the fixed end 3a is about the horizontal distance L of the inlet / outlet pipe 3. When located in the range of 35% to 45%, the result is that the deformation or damage of the joint A of the inlet / outlet pipe 3 and the manifold inlet and outlet 21 can be minimized. For example, in the case of the inlet / outlet pipe 3 having a horizontal length L extending straight from the entrance 21 of the manifold 2 40 mm, the position spaced apart from the fixed end 3a by a distance of 14 to 18 mm. When the notch portion 30 is molded in, deformation or damage of the coupling portion A of the inlet / outlet pipe 3 and the manifold inlet and outlet 21 can be minimized.

On the other hand, according to the result of the stress structure analysis of the inlet / outlet pipe 3 having a horizontal length L of 100 mm and a thickness of 1.2 mm, the pipe is notched 30, as can be seen in the graph of FIG. When () is located about 10% of the horizontal length (L = 100 mm) of the inlet / outlet pipe (3) it was found that more stress occurs rather than without the notch (30). This seems to be because the notch 30 has a shape vulnerable to stress in the vicinity thereof.

Stacked heat exchanger assembly according to the present invention having a notch portion 30 based on the stress analysis results as described above in the inlet / outlet pipe by the operator in the assembly process or logistics process for the air conditioning case (not shown) ( When the moment acts on 3), the notch portion 30 formed on the pipe 3 absorbs and exhausts the moment while firing and deforming it preferentially by the moment, thereby creating an inlet / outlet pipe generated by the moment transfer. Coupling portion A between (3) and manifold inlet / outer portion 21 can suppress deformation and damage. Thus, after the heat exchange tube 1, the manifold 2 and the inlet / outlet pipe 3 are integrated to form a finished heat exchanger assembly, the inlet / outlet pipe 3 which frequently occurs after transportation or assembly during the transportation or assembly process, The defective rate of heat exchanger caused by deformation or damage of the manifold access portion 21 coupling portion can be greatly reduced.

According to the laminated heat exchanger assembly according to the present invention as described in detail above, the notch portion formed on the outer periphery of the inlet / outlet pipe absorbs and exhausts the moment generated in the inlet / outlet pipe by deformation energy in the assembling process, etc. In addition, it is possible to prevent frequent deformation and damage at the coupling portion (A) of the inlet / outlet pipe and the inlet and outlet of the heat exchanger assembly. Therefore, the defective rate of the heat exchanger that occurs after the logistics or assembly process can be greatly lowered, and as a result, the manufacturing cost of the heat exchanger can be reduced. This makes it possible to perform the assembly work and the like without fear of deformation and damage of the inlet / outlet pipe (3) can also have the side effect of improving the assembly work efficiency of the heat exchanger assembly.

Claims (4)

A plurality of heat exchange tubes (1) stacked to communicate with each other through tank parts formed at an upper end thereof to sequentially guide heat exchange fluid; At least two manifolds (2) interposed between the heat exchange tubes and communicating with the heat exchange tubes, and having an entry part 21 extending and inlet and exchanging heat exchange fluid on one side thereof; The fixed end 3a is inserted into and coupled to the inlet and outlet of each manifold, and when the moment is generated at the free end 3b opposite the fixed end, plastic deformation is given to other parts to give the plastic strain energy. It comprises an inlet / outlet pipe (3) having at least one notch portion (30) to absorb and extinguish, Stacked heat exchanger, characterized in that the separation distance (l) to the fixed end (3a) of the notch portion 30 is in the range of 30% to 60% of the length (L) of the horizontal portion of the inlet / outlet pipe (3) Assembly. delete delete The method of claim 1, Stacked heat exchanger assembly, characterized in that the separation distance to the fixed end (3a) of the notch portion (30) ranges from 35% to 45% of the horizontal length (L) of the inlet / outlet pipe.

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