KR20010063071A - Heat exchanger which it's joint between inlet/outlet pipe and manifold is reinforced - Google Patents

Abstract

PURPOSE: A heat exchanger is provided to exclude a linear contact bead portion having weak structure in connecting a manifold plate, a refrigerant suction pipe and a discharge pipe and to improve brazing properties by adopting a spacer useful as reinforcement. CONSTITUTION: A couple of manifold plates(4) include two opposed plates(12a,12b) protruded into a tank, having bonding parts(114) formed along each margin. The bonding parts are attached to each face(131,132). A linear contact bead portion is formed at the end of accepting both refrigerant suction and discharge pipes. The bead portion has a circular shape for accepting the circular refrigerant suction and discharge pipes. To reinforce the linear contact bead portion, a circular spacer fills outside the manifold plates. Herein, the spacer is adopted to prevent the relatively thinner manifold plates than the suction/discharge pipes from being molten. The spacer is made by extrusion. Therefore, an additional process is not needed and the spacer is formed easily with a long bar shape.

Description

Heat exchanger with increased rigidity of refrigerant inlet and outlet pipe connection {HEAT EXCHANGER WHICH IT'S JOINT BETWEEN INLET / OUTLET PIPE AND MANIFOLD IS REINFORCED}

The present invention relates to an air conditioner heat exchanger for automobiles, the end of the heat exchanger manifold plate connected to the pipe in which the heat exchange fluid is introduced and discharged secures a constant welding surface, and clamping (clamping) to wrap the secured welding surface It relates to a heat exchanger with increased rigidity of the refrigerant oil and oil inlet and outlet pipe connection is inserted.

In general, an air conditioner for a vehicle uses the heat generated by an engine to heat a vehicle outdoor air (hereinafter referred to as "outside air") and indoor air (hereinafter referred to as "betting") to a warmth, or a heat exchange medium of a refrigeration unit. By using latent heat of evaporation, it is made into cold and selectively introduced and harmonized to make the air in the interior of the car optimally for the user to use, and it is also a car window in the rainy weather or winter season when the clock is not secured. It is a safety device that ensures that the driver's vision does not inconvenience.

The heat exchanger of the vehicle air conditioner includes a heater, a condenser, and an evaporator. Here, only the evaporator will be described.

There are various kinds of evaporators depending on the application, but generally, the evaporator is classified into a fin-tube type, a serpentine type, and a laminate type. Fin-tube type evaporator drills a hole in a flat aluminum plate and presses a tube of circular cross section at regular intervals between them and has a distributor, and a serpentine type evaporator uses a porous refrigerant tube having a cross-sectional shape similar to harmonica "S." It bends into a "shape and sandwiches the air-side heat sink fins between the tubes. In addition, the laminated evaporator is composed of two sheets of steel plate-shaped aluminum plates stacked in a row, and a pin inserted therebetween.

The heat exchange principle of the evaporator is such that the low-temperature low-pressure liquid refrigerant passing through the expansion valve by the throttling action absorbs the heat (evaporative latent heat) necessary for evaporation from the air entering the evaporator and turns it into a gas (superheated steam). In the process of refrigerant evaporation, heat is exchanged and the cooled indoor or outdoor air is introduced into the vehicle interior and used.

Evaporators are used in various ways depending on their structure and performance. In general, laminate evaporators are mainly used in automobiles. Therefore, only evaporators will be described here. In addition, laminate evaporators are used depending on the refrigerant flow in the evaporator. Both tank evaporator and single tank evaporator are divided into two, but the present invention will be described in the description, for example, only two-tank evaporator because it has the same structure.

Laminate type evaporator composed of a single tank has two joints formed by being raised along the edge and welded along the edge, and recessed at the top side, and partition beads projected in a straight line to a predetermined point at the bottom between the tank holes. Several plate tubes; Heat dissipation fins stacked between the plate tubes; Two end plates installed at their outermost sides for reinforcement of the plate tubes and the heat dissipation fins; A refrigerant inlet pipe and a refrigerant discharge pipe connected to two manifold plates protruding from the inside of the tank among the plate tubes; And a spacer connecting the refrigerant inlet tube and the refrigerant discharge tube with the manifold plate.

The manifold plate is composed of a pair of plate tubes that are joined together to form a pair of plate tubes, and protruding portions extending through the tank and the inside of the plate tubes, and the protruding manifold plates have a predetermined length by a predetermined length. At the end portion where the refrigerant is introduced or the discharge pipe is inserted, it is a circular shape that forms a bead portion (joined at the base thickness of the plate), and thus the bonding strength and the bonding strength at the line bonding portion are weak.

In addition, since the base thickness of the manifold plate is thinner than the base thickness of the refrigerant inlet and outlet tubes, the manifold plate with a thinner base thickness melts when the refrigerant inlet and outlet tubes are welded to the manifold plate of the core that has been brazed at a high temperature. There was a problem that the phenomenon occurred.

Therefore, a spacer is provided on the outer surface of the manifold plate as a reinforcement material to prevent the melting of the manifold plate due to the high temperature used during welding, as a reinforcement material to reinforce the weakness of the manifold plate forming the pre-joint bead portion. The method of insertion was used, but the shape of the spacer was circular so that the pre-bonded bead portion and the surface-bonded bead portion having a constant shape could not be completely wrapped. This is because there is still a preliminary bead portion between the section where the spacer is inserted and the section where the stiffness is joined, and the outer diameter of the spacer is small so that the thermal degradation region exists in the manifold plate, thereby failing to completely escape the weakness of this section. In addition, even after the manifold plate is brazed with the refrigerant inlet pipe and the refrigerant discharge pipe, there is a preliminary bead portion that forms a relatively weak boundary, and the vulnerable portion is damaged by external pressure or refrigerant pressure when the evaporator is mounted on the vehicle. Or corrosion caused by refrigerant leakage, which caused the evaporator not to function properly, resulting in increased production costs due to poor productivity and poor deposition.

In addition, even after being mounted on the vehicle, there is a problem in that durability is weak due to corrosion before other parts due to the weakness of the coupling portion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and includes a spacer which can serve as a reinforcing material by excluding a preliminary bead portion having a weak structure in coupling a manifold plate constituting a heat exchanger, a refrigerant inlet pipe, and a discharge pipe. It is an object of the present invention to provide a heat exchanger having an improved brazing property and an increased rigidity of the refrigerant oil / exit pipe connection.

1 is a perspective view of a heat exchanger made by combining a spacer and a refrigerant inlet and discharge pipe to a manifold plate according to the present invention.

FIG. 2A is an enlarged partial perspective view of the main portion of FIG. 1 in the assembling order.

FIG. 2B is a perspective view of another embodiment of FIG. 2A. FIG.

3 is a partial perspective view showing two manifold plates joining to form a plate tube.

4A is a partial perspective view of a bead surface formed in accordance with the present invention in a manifold plate.

4B is a perspective view showing another embodiment of FIG. 4A.

5 is a partial cross-sectional view showing a state in which the manifold plate, the spacer, the refrigerant inlet, and the discharge tube according to the present invention are welded.

6A is a cross-sectional view taken along the line "VI-VI" in FIG. 5.

6B is a cross-sectional view illustrating another embodiment of FIG. 6A.

7A, 7B and 7C are cross-sectional views of an embodiment of a spacer according to the present invention.

FIG. 7D is a side view illustrating the side surfaces of FIGS. 7A, 7B, and 7C.

8 is a perspective view illustrating a conventional sun bead surface in a manifold plate.

9 is a cross-sectional view of a welded portion of a manifold plate, a spacer, a refrigerant inlet, and an outlet tube in a conventional heat exchanger.

<Description of Symbols for Main Parts of Drawings>

1: Plate tube 2: Air side heat radiation fin

3: Manifold plate 131,132: Conventional face bead part

133,134: surface bead portion 135 according to the present invention: conventional line bead portion

136: surface bead part for increasing rigidity (face bead part + conventional wire bead part according to the present invention)

137: weak part of the manifold plate 7: refrigerant inlet pipe

8: refrigerant discharge pipe 9: spacer (invention)

In order to achieve the above object, the present invention, between the two tank holes are formed by recessed side by side at the upper end and the welded to be welded along the edge and the partition between the tank holes are welded in a straight line to a predetermined point of the lower end A plurality of plate tubes having beads; Heat dissipation fins stacked between the plate tubes; Two end plates installed at their outermost sides for reinforcement of the plate tubes and the heat dissipation fins; And a refrigerant inlet pipe and a refrigerant discharge pipe connected to two manifold plates protruding from the inside of the tank among the plate tubes, wherein the refrigerant inlet or exhaust pipe connection of the manifold plate is connected. Characterized in that it comprises an interview bead portion so that the site is bonded to its end.

When the pre-bonded bead portion of the conventional manifold plate is formed by the surface-bonded bead portion according to the present invention, the rigidity-increasing effect due to the increase in the joint area and the stiffness-increasing effect due to the increase in the cross-sectional performance (cross section second moment) can be obtained.

In addition, the present invention is characterized in that it further comprises a spacer formed of an extruder to wrap the outer surface of the manifold plate of the manifold plate so as not to open, and to embrace it even if the shape of the end of the manifold plate is changed. do.

Hereinafter, the functions and operations of the respective components of the present invention presented through embodiments of the accompanying drawings will be described in detail. In particular, in the heat exchanger constituting the vehicle air conditioner, only the evaporator will be described, and each reference numeral is identically referred to. use.

As shown in FIGS. 1 to 3, the evaporator generally includes two tank holes 111 and 112 formed by being recessed side by side at an upper end with a joint 114 that is raised and welded along an edge and between the tank holes. A plurality of plate tubes (1) provided with a partition bead (113) which is projected and welded in a straight line to a predetermined point at the bottom; Radiating fins (2) stacked between the plate tubes; And it includes two end plates (5, 6) that are installed on the outermost for reinforcing the plate tubes and the heat radiation fins.

2A (FIG. 2B), the evaporator has a refrigerant inlet pipe in the same direction as the manifold plate 3 in a part of the plate tubes 1 protruding from the manifold tube. 7 and the refrigerant discharge pipe 8 are connected to form a refrigerant passage with the outside.

On the other hand, the manifold tube has an extension for connecting with the refrigerant inlet tube 7 and the refrigerant discharge tube 8 as one of the plate tubes. More specifically, this manifold plate (3) (4) is, as shown in Figs. 3 to 5, the two plates (12a, 12b) are extended to protrude so that the two plates (12a, 12b) to be in contact with the inside of the tank A joint 114 which is raised and welded along the edge and is joined to a predetermined surface 131 and 132 by a predetermined length, and is pre-bonded at the end portion where the refrigerant inlet and discharge pipes 7 and 8 are inserted. It is configured to form a bead portion 135, the bead portion is configured in a circular shape so that the circular refrigerant inlet, discharge pipe can be inserted. This manifold plate (3) (4) is used to reinforce the pre-bonded bead portion (135) when combined with the refrigerant inlet (7), discharge pipe (8), and the manifold plate (3) (4) is the refrigerant inlet Since the base thickness is relatively thinner than the discharge pipes 7 and 8, the circular spacer 10 having a constant thickness and width is press-fitted on the outer surface thereof in a way to prevent melting during welding.

As shown in FIG. 8 and FIG. 9, since the circular spacer 10 cannot completely cover the junction bead portions 131 and 132, the section of the junction junction bead portion 135 and the junction portion of the junction bead portion 135 are not included. Between sections 131 and 132, there is a thermal damage region on the outer surface of the vulnerable portion 137 and the manifold plate. This is because there is an existing pre-join bead section (Z) that forms a boundary between a section (X) having a spacer inserted therein and a section (Y) formed in a predetermined plane, and thus cannot completely escape the conventional weakness. .

Therefore, the present invention, as shown in Figure 4a (Fig. 4b) and Figure 5, in order to compensate for the weakness of the refrigerant oil, the access pipe connection portion of the manifold plate (3) (4), conventional weak pre-joint bead The part 135 is formed to extend to the predetermined joint bead 133,134, or by extending the existing joint bead 131,132 to the end to remove the vulnerable parts held by the conventional refrigerant oil, access pipe connection portion The invention is capable of forming the bead portion 136 is increased rigidity.

In addition, the present invention includes a spacer 9 having a shape that can accommodate the extension portion when the extension portion is formed to be bonded to the end portion of the manifold plate as shown in FIGS. 5 to 6A (FIG. 6B). Since the spacer 9 is manufactured by extrusion, there is no need for additional processing, and the spacer 9 can be easily cut and used when used as a long bar, thereby improving productivity.

The spacer 9 may have a different shape according to the shape of the manifold plates 3 and 4. Looking at an example of the shape, the spacer 9 may be designed in various shapes as shown in FIGS. 7A, 7B and 7C. It is a very effective recipe.

As described above, in the heat exchanger for the vehicle air conditioner according to the present invention, particularly in the evaporator, the area of the bonding bead is increased when the manifold plate is connected with the refrigerant outlet pipe and the refrigerant discharge pipe, and the outer surface thereof is an extrusion spacer. By press-fitting, it is possible to make a heat exchanger with increased rigidity of the refrigerant oil / exit pipe connection.

Therefore, the heat exchanger with increased rigidity of the refrigerant oil / exit pipe connection can improve the production by preventing the bonding failure or breakage that may occur in manufacturing, and the durability is ensured even after being mounted on the vehicle, so that The distrust can be eliminated, improving the reliability of the product.

The present invention can be variously modified and implemented by one of ordinary skill in the art without departing from the scope of the claims.

Claims (2)

Two bead holes 111 and 112 formed by being recessed side by side at the upper end and the welded portion 114 which is welded and welded along the edge and the partition bead is welded in a straight line to a predetermined point of the lower end between the tank holes A plurality of plate tubes (1) comprising (113); Radiating fins (2) stacked between the plate tubes; Two end plates (5) (6) installed at their outermost sides for reinforcement of the plate tubes and the heat dissipation fins; A refrigerant inlet pipe (7) and a refrigerant discharge pipe (8) connected to two manifold plates (3) (4) protruding from the inside of the tank among the plate tubes; Automotive air conditioner formed of a spacer (9) inserted into the outer surface of the coupling portion of the manifold plate to increase the rigidity when connecting the refrigerant inlet pipe (7) and the refrigerant discharge pipe (8) with the manifold plate (3) (4) For a heat exchanger, The end portions of the manifold plates 3 and 4 connected to the coolant outlet pipe 7 and the coolant discharge pipe 8 have a constant face-to-face contact rather than a line joint. Even if the heat exchanger is increased in rigidity of the refrigerant oil and flow pipe connection, characterized in that the spacer (9) is inserted into the outer surface to act as a clamp. The method of claim 1, In the spacer (9) which can be inserted into the outer surface and acts as a clamp even though the manifold plate has a constant surface bonding, the spacer (9) is formed by the extrusion method, characterized in that the refrigerant oil, the inlet and outlet pipe connection Heat exchanger with increased rigidity.