KR101264621B1 - Header tank for heat exchanger and it's production method - Google Patents

Abstract

The present invention relates to a header tank of a heat exchanger and a method of manufacturing the same, and an object thereof is to punch and process a tube insertion hole of a header pipe after circular saw processing to improve pressure resistance in a heat exchanger in which a header pipe and a clad sheet are combined. The present invention provides a header tank of a heat exchanger for making surface contact between a pipe and a clad sheet, and a method of manufacturing the same. The header tank of the heat exchanger according to the present invention has at least one refrigerant passage 11 formed in the center of the longitudinal direction, the extruded material formed with a plurality of tube insertion holes 12 in the direction perpendicular to the refrigerant passage 11 The clad sheet 20 coupled to the header pipe 10 of the header pipe 10 and the tube insertion hole 12 side of the header pipe 10, and a plurality of slots 21 corresponding to the tube insertion hole 12 are formed. In the header tank of the heat exchanger, the tube insertion hole (12) of the header pipe (10) is punched through the inside of the tube insertion hole (12) after the first process by circular saw (S) processing ( Secondary processing to P), the width (Pw) of the punch (P) is made equal to or smaller than the width of the first tube insertion hole (12) as seen in the longitudinal cross section of the header pipe (10) The inner diameter of the adjacent tube insertion hole 12 of the header pipe 10 is constant.

In addition, the manufacturing method of the header tank of the heat exchanger according to the present invention is extruded to form at least one refrigerant passage 11, a plurality of tube insertion holes 12 in a direction perpendicular to the refrigerant passage (11). In the manufacturing method of the header tank of the heat exchanger in which the clad sheet 20 in which the plurality of slots 21 corresponding to the refrigerant flow passage 11 are formed outside the header pipe 10 is formed. In the step of processing the tube insertion hole 12 of the header pipe 10 with a circular saw (S), and processing the inside of the tube insertion hole 12 with a punch (P), the punch (P) The width Pw is equal to or smaller than the width of the primary tube insertion hole 12, and the step of punching the curvature is not formed between the tube insertion hole 12 of the header pipe 10 .

Header tank, clad sheet, cutting means, punch

Description

Header tank for heat exchanger and its manufacturing method {Header tank for heat exchanger and it's production method}

1 is a plan view showing an embodiment of a header tank of a heat exchanger according to the prior art.

2 is a cross-sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 is a cross-sectional view of the clad sheet bonded to the header pipe of FIG.

5 is a view showing the size of a punch according to the prior art.

Figure 6 is a side sectional view showing a first embodiment of a heat exchanger according to the present invention.

7 is a front sectional view showing a first embodiment of a heat exchanger according to the present invention.

8 is a view showing the size of a punch according to the present invention.

9 is a view showing a state in which burring is formed on the clad sheet in the first embodiment of the heat exchanger according to the present invention.

10 is a graph showing the relationship between the joint length and the pressure resistance between the tube insertion holes according to the present invention.

11 is a view for explaining a processing method of the header tank of the heat exchanger according to the present invention.

12 is a side sectional view showing a second embodiment of a heat exchanger according to the present invention;

Figure 13 is a side sectional view showing a third embodiment of a heat exchanger according to the present invention.

14 is a side sectional view showing a fourth embodiment of a heat exchanger according to the present invention;

15 is a side sectional view showing a fifth embodiment of a heat exchanger according to the present invention;

(Explanation of Reference Numbers for Main Parts in the Drawings)

10: header pipe 11: refrigerant flow path

12: tube insertion hole 20: clad sheet

21: slot S: cutting means

P: Punch

The present invention relates to a header tank of a heat exchanger and a method of manufacturing the same. More particularly, in order to improve pressure resistance in a heat exchanger in which a header pipe and a clad sheet are combined, the tube insertion hole of the header pipe is punched after cutting means. The present invention provides a header tank of a heat exchanger for making surface contact between a header pipe and a clad sheet, and a method of manufacturing the same.

In general, Freon refrigerant, which has been widely used in a vehicle cooling system, is chemically stable, non-explosive, non-flammable and non-toxic refrigerant, and thus has been used as a refrigerant for refrigerators and freezers, household or vehicle air conditioners. When released into the atmosphere, it is not destroyed but reaches the stratosphere. In the stratosphere, chlorine atoms of Freon are decomposed by the sun's ultraviolet rays, and these chlorine atoms are a major cause of ozone layer destruction, which serves to block ultraviolet rays entering the earth.

Therefore, in 1987, the Montreal Protocol, which regulated the production and consumption of Freon and agreed to gradually replace it with other refrigerants, was adopted.The refrigerant used as a substitute for Freon was less harmful than Freon, and the extrusion efficiency was lower. Carbon dioxide is welcomed as an alternative refrigerant in that it has a high heat transfer characteristic to external fluid (air) and excellent volumetric cooling ability (evaporation latent heat x gas density), thereby reducing the capacity of the compressor.

As described above, a heat exchanger using carbon dioxide as a refrigerant requires an operating pressure of high pressure, and thus, an extruded material is used to easily manufacture a header pipe structure resistant to internal pressure, and a medium and pressure resistance reinforcement for joining the extruded material and the tube are provided. Clad sheets are overlapped for this purpose.

1 to 5 is a view showing an example of a header tank of a high-pressure heat exchanger according to the prior art.

As shown in the drawing, the header pipe 1 of the high-pressure heat exchanger has a refrigerant flow passage 1a formed at the center in the longitudinal direction, and a plurality of tube insertion holes 1b are formed at right angles to the refrigerant flow passage 1a. It is formed, the tube 3 is coupled to the tube insertion hole (1b).

In order to process the tube insertion hole 1b, the piercing is performed using a press. At this time, the material is sucked around the tube insertion hole 1b due to the piercing, and the burring B is formed. Punch is shown, and the size of the punch P is shown in FIG.

When the clad sheet 2 is coupled to the outer circumferential surface of the header pipe 1 in which the burring B is formed as shown in FIG. 4, an inner diameter d is formed between the adjacent tube insertion holes 1b of the header pipe 1. When the curved portion and the clad sheet having a non-uniform shape are in line contact (4), there is a problem in that the empty space 5 is formed on the left and right sides of the curved portion to lower the pressure resistance of the heat exchanger.

In order to solve the above problems, there is a method of piercing by inserting a mold into the header pipe 1 of the extruded material, but to realize this, there is a problem that the space inside the header pipe 1 must be sufficiently secured. In the header pipe 1 of a predetermined length or more, breakage of the mold to be coupled to the inside is severe, causing a rise in processing cost.

The present invention has been made to solve the above problems, and its object is to improve the pressure resistance in the heat exchanger in which the header pipe and the clad sheet are combined, and then punching the header pipe through the tube insertion hole of the header pipe to process the header pipe and the header pipe. The present invention provides a header tank of a heat exchanger for making surface contact between clad sheets and a method of manufacturing the same.

In order to achieve the above object, the present invention provides a header pipe of an extruded material in which at least one coolant flow path is formed at a center in a longitudinal direction, and a plurality of tube insertion holes are formed in a direction perpendicular to the coolant flow path, and a tube of the header pipe. In the header tank of the heat exchanger, which is composed of a clad sheet having a plurality of slots corresponding to the tube insertion hole, coupled to the insertion hole side, the tube insertion hole of the header pipe is primarily processed by cutting means. Afterwards, the inside of the tube insertion hole is secondly processed with a punch, and the width of the punch is equal to or smaller than the width of the first processed tube insertion hole, and the tube adjacent to the header pipe when viewed in a longitudinal cross section of the header pipe. The inner diameter of the insertion hole is constant.

In addition, the height of the punch is greater than the height of the hole formed in the inner peripheral surface of the header pipe after the primary processing, and smaller than the height of the hole formed in the outer peripheral surface.

In addition, a plurality of slots corresponding to the refrigerant flow passage are formed on the outside of the header pipe which is extruded to form at least one refrigerant flow passage, and a plurality of tube insertion holes are formed at right angles to the refrigerant flow passage. In the method of manufacturing a header tank of a heat exchanger in which a cladding sheet is overlapped, the method includes processing a tube insertion hole of the header pipe with a cutting means, and processing the inside of the tube insertion hole with a punch, wherein the width of the punch is Punching is made so as to be less than or equal to the width of the primary tube insertion hole is formed between the tube insertion hole of the header pipe.

The method may further include processing the communication path between the tube insertion holes by cutting means when the tube insertion holes are two or more rows.

In addition, the cutting means is moved up and down to process the tube insertion hole and the communication path at once.

In addition, the primary processed tube insertion hole is to form a hole larger than the tube hole processed in the clad sheet.

In addition, the burring portion of the clad sheet is to be inserted into the tube insertion hole of the primary processed extruded material.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6 to 10 are views showing a first embodiment of the header tank of the heat exchanger according to the present invention.

As shown, the header tank of the heat exchanger has at least one refrigerant passage 11 formed in the center of the longitudinal direction, and an extruded material having a plurality of tube insertion holes 12 formed in a direction perpendicular to the refrigerant passage 11. The clad sheet 20 coupled to the header pipe 10 of the header pipe 10 and the tube insertion hole 12 side of the header pipe 10, and a plurality of slots 21 corresponding to the tube insertion hole 12 are formed. (30 denotes a tube.)

In the above-described tube insertion hole 12 of the header pipe 10, after the first processing by the cutting means (S) processing, the inside of the tube insertion hole 12 is secondary processing with a punch (P), Figure 9 as the shown width (Pw) of the punch (P) is the because greater than the width of the first tube insertion hole 12 processed tea or smaller made not cause deformation to the outer surface of the tube insertion holes 12 As seen from the longitudinal section of the header pipe 10, the inner diameter and the outer surface of the neighboring tube insertion hole 12 of the header pipe 10 are constant.

In addition, the height Ph of the punch P is larger than the height H1 of the hole formed in the inner circumferential surface of the header pipe 10 after the primary processing, and smaller than the height H2 of the hole formed in the outer circumferential surface.

That is, since the curved surface is not formed during the punching process as in the prior art, as shown in FIG. 7, the inner diameter D of the header pipe 10 is constant, and between adjacent tube insertion holes 12 of the header pipe 10. Since the bonding length L of the clad sheet 20 is long, the adhesion is improved, the brazing property is improved at the time of brazing, and the pressure resistance required in the high pressure heat exchanger is improved.

In addition, the primary processed tube insertion hole 12 is preferably formed to be larger than the tube hole processed in the clad sheet 20 to facilitate the coupling of the tube (30).

As shown in FIG. 8, the burring portion 22 of the clad sheet 20 is inserted into the tube insertion hole 12 of the primary processed extruded material.

For reference, as the graph shown in FIG. 10 shows that the longer the joint length L between the adjacent tube insertion holes 12 of the header pipe 10 and the clad sheet 20, the pressure resistance of the header pipe 10 is improved. Is showing.

The header tank of the heat exchanger configured as described above will be described with reference to the drawing of FIG. 11.

First, the header pipe 10 of the heat exchanger of the present invention allows the tube inserting hole 12 to be cut in a direction perpendicular to the refrigerant flow passage 11 on the outer circumferential surface of the extruded header pipe 10. do.

When the tube inserting hole 12 is subjected to the cutting means S, the tube inserting hole 12 is formed with an oblique or arc-shaped inclined portion.

When the tube inserting hole 12 is processed as above, the cutting means S is processed, and then the inside of the tube inserting hole 12 is processed with a punch P. At this time, the width Pw of the punch P is 1. Since the same or smaller than the width of the differentially processed tube insertion hole 12, the burring or the like does not occur as in the conventional process.

That is, the first tube insertion hole 12 is slightly larger than the tube insertion hole into which the actual tube 30 is inserted so that the tube 30 can be inserted smoothly.

12 is a side cross-sectional view showing a second embodiment of the heat exchanger according to the present invention, Figure 13 is a side cross-sectional view showing a third embodiment of the heat exchanger according to the present invention, which is a refrigerant flow passage 11 in two rows The header pipe 10 which was comprised is shown.

The header pipe 10 of the heat exchanger in FIG. 12 shows a state in which two tube insertion holes 12 are formed in the refrigerant flow path 11 at right angles, and in FIG. 13, two tube insertion holes 12 are formed. The state which forms and forms the communication path 13 between by the other cutting means S is shown.

In addition, in FIG. 13, the cutting means S may be moved up and down to process the tube insertion hole 12 and the communication path 13 at one time, thereby shortening the cutting time.

14 is a side cross-sectional view showing a fourth embodiment of the heat exchanger according to the present invention, Figure 15 is a side cross-sectional view showing a fifth embodiment of the heat exchanger according to the present invention, which is a refrigerant flow passage 11 in three rows The header pipe 10 which was comprised is shown.

The header pipe 10 of the heat exchanger in FIG. 14 shows a state in which three tube inserting holes 12 are formed in the refrigerant flow path 11 at right angles, and in FIG. 15, two tube inserting holes 12 are formed. The state which forms and forms the communication path 13 between by the other cutting means S is shown.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it will be understood that various modifications and other embodiments are possible to those skilled in the art.

According to the header tank of the high-pressure heat exchanger and the method for providing the same according to the present invention as described above in detail, by punching the tube insertion hole of the header pipe after the cutting means processing to make a surface contact between the header pipe and the clad sheet, Pressure resistance can be improved in the heat exchanger in which the pipe and the clad sheet are combined.

Claims (7)

At least one refrigerant passage 11 is formed in the center in the longitudinal direction, the header pipe 10 of the extruded material formed with a plurality of tube insertion holes 12 in a direction perpendicular to the refrigerant passage 11, The header tank of the heat exchanger, which is coupled to the tube insertion hole 12 side of the header pipe 10 and is formed of a clad sheet 20 having a plurality of slots 21 corresponding to the tube insertion hole 12. To The tube insertion hole 12 of the header pipe 10 is first processed by the cutting means S, and then the inside of the tube insertion hole 12 is secondly processed with a punch P, but the punch ( The width Pw of P) is made equal to or smaller than the width of the first processed tube insertion hole 12, and the tube insertion hole adjacent to the header pipe 10 when viewed in the longitudinal section of the header pipe 10. The header tank of the heat exchanger, characterized in that the inner diameter between the (12). The height Ph of the punch P is greater than the height H1 of the hole formed in the inner circumferential surface of the header pipe 10 after the primary processing, and smaller than the height H2 of the hole formed in the outer circumferential surface. Heat exchanger header tank. The refrigerant is extruded to form at least one refrigerant passage 11, and a plurality of tube insertion holes 12 are formed at right angles to the refrigerant passage 11. In the manufacturing method of the header tank of the heat exchanger in which the clad sheet 20 in which the several slot 21 corresponding to the flow path 11 is formed overlaps, Machining the tube insertion hole 12 of the header pipe 10 with cutting means S; The inside of the tube insertion hole 12 is processed with a punch P, but the width Pw of the punch P is equal to or smaller than the width of the tube insertion hole 12 which is primarily processed. The method of manufacturing a header tank of the heat exchanger, characterized in that it comprises the step of punching the curvature is not formed between the tube insertion hole (12) of 10). According to claim 3, characterized in that it further comprises the step of processing the communication path 13 between the tube insertion holes 12 with the cutting means (S) when the tube insertion holes 12 are two or more rows. Method for manufacturing a header tank of a heat exchanger. The method of manufacturing a header tank of a heat exchanger according to claim 4, wherein the cutting means (S) is moved up and down to process the tube insertion hole (12) and the communication path (13) at once. 4. The method of claim 3, wherein the primary tube insertion hole (12) forms a larger hole than the tube hole processed in the clad sheet (20). 4. The method of claim 3, wherein the burring portion (22) of the clad sheet (20) is inserted into the tube insertion hole (12) of the primary processed extruded material.

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