JP2020101329A - Heat exchanger and manufacturing method thereof - Google Patents

Abstract

To make a discharge performance of dew condensation water better.SOLUTION: A heat exchanger is configured, so that plural tube members formed to constitute a flat heat-exchanging tube having two flow inlets/outlets of a heat-exchanging medium and a communication path communicating the two flow inlets/outlets by jointing them opposite to each other using a metal material are laminated, so that the two flow inlets/outlets of the adjacent heat-exchanging tubes are matched with each other. Heat is exchanged between the heat exchanging medium flowing in the heat-exchanging tube and a heat-exchanged medium flowing between it and the adjacent heat-exchanging tube. Plural V-like or U-like notch parts are formed on the tube member at least at one part of an outer periphery. Dew condensation water is introduced and exhausted to the notch part, so that an exhausting property of the dew condensation water can be made sufficient.SELECTED DRAWING: Figure 3

Description

The present invention relates to a heat exchanger and a method for manufacturing the same, and more particularly to a heat exchanger configured by stacking a plurality of flat heat exchange tubes and a method for manufacturing the same.

Conventionally, as this type of heat exchanger, a tube member is provided with two outflow-inlet through holes so as to be arranged in series in the lateral direction at the center in the longitudinal direction, and the two outflow-inlet through holes are provided. There has been proposed a heat exchange tube that is formed by forming two U-shaped and mirror-image-symmetrical communication channels that communicate with each other (see, for example, Patent Document 1). In this heat exchanger, when the heat exchange target medium is supplied and discharged in a direction perpendicular to the longitudinal direction, two outflow/inlet through holes are formed at both longitudinal ends of the rectangular heat exchange tube. In addition, the flow passage width of the heat exchange medium can be widened by one of the outflow/inlet through holes as compared with a communication flow passage formed to connect the two outflow/inlet through holes. It is possible to widen the flow path width effective for heat exchange.

JP, 2017-072331, A

The heat exchanger described above is sometimes used for heat recovery, and depending on the use environment, condensed water may be generated in the heat exchange tube. The dew condensation water is generated between the adjacent heat exchange tubes, and if stagnant, it reduces the ventilation area of the heat exchanger and reduces the heat exchange efficiency. Therefore, it is necessary to improve the drainability of the condensed water.

The main purpose of the heat exchanger of the present invention is to improve the drainability of condensed water. Further, the main object of the method for manufacturing a heat exchanger of the present invention is to propose a method for relatively easily and accurately manufacturing a heat exchanger having a good discharge property of condensed water.

The heat exchanger and the manufacturing method thereof according to the present invention employ the following means in order to achieve the above-mentioned main object.

The heat exchanger of the present invention is
A tube member formed so as to form a flat heat exchange tube having two outlets and outlets of a heat exchange medium and a communication channel communicating with each other by joining them facing each other using a metal material. Of a plurality of heat exchange tubes of adjacent heat exchange tubes are laminated so that the two outlets and inlets of the heat exchange tubes are aligned, and the heat exchange medium flowing between the heat exchange medium and the heat exchange tube adjacent to the heat exchange medium flows between the heat exchange tubes. A heat exchanger for exchanging heat with an exchange medium,
The tube member is formed with a plurality of notches on at least a part of the outer peripheral edge,
It is characterized by

In this heat exchanger of the present invention, a plurality of notches are formed on at least a part of the outer peripheral edge of the tube member. Since the dew condensation water is guided to the notch and is discharged, the dew condensation water can be discharged well. As a result, the heat exchange efficiency can be improved as compared with the case where the dew condensation water is poorly discharged. Further, by forming the notch, it is possible to gradually reduce the inflow cross-sectional area of the heat exchange medium as compared with the case where the notch is not formed. As a result, the flow resistance of the heat exchange medium can be reduced, and the heat exchange efficiency can be improved. In addition, it is preferable that the notch has a V shape, a U shape, or a sawtooth wave shape.

In the heat exchanger of the present invention, the tube member has a rectangular shape, and the notch is continuously formed over only one of the two edges in the longitudinal direction facing each other. The heat exchange tube has a longitudinal edge in which one of the two tube members facing each other is formed with the notched portion and the other edge in the longitudinal direction at which the notched portion is not formed. It may be assembled so as to be aligned with the section. In this way, it is possible to improve the drainability of the condensed water without reducing the heat transfer area of the heat exchange tube. Even in this case, the inflow cross-sectional area of the heat exchange medium can be gradually reduced, so that the heat exchange efficiency can be improved.

Further, in the heat exchanger of the present invention, the tube member has a rectangular shape, and the notch portion is continuously formed over both of the two edge portions in the longitudinal direction facing each other. The replacement tube may be assembled so that the notches of the two tube members joined face to face are aligned. This makes it possible to further improve the drainability of the condensed water.

The manufacturing method of the heat exchanger of the present invention,
A clad plate material having a thickness of 0.3 mm or less in which a second metal having a lower melting point than that of the first metal is bonded to a central material made of the first metal and has a rectangular outer shape and two edge portions in the longitudinal direction. A tube member forming step of forming a tube member having a communication channel extending from only one of the two outflow inlets to the other of the two outflow inlets, and a plurality of cutout portions are formed continuously only on one of the two outflow inlets; ,
One of the two tube members to be assembled facing each other such that the communication channel and the outflow inlet are aligned, and the longitudinal edge portion where the notch portion is formed and the other notch portion are A plurality of flat tube members for heat exchange are laminated so that a plurality of flat tube tubes for heat exchange are laminated so as to be aligned with a longitudinal edge which is not formed. Assembling process to assemble the laminated body by
A brazing step of brazing the laminate using a furnace adjusted to a temperature lower than the melting point of the first metal and higher than the melting point of the second metal;
It is characterized by having.

In the method for manufacturing a heat exchanger according to the present invention, the heat exchanging tube is formed by joining the heat exchanging tubes face to face with each other, and the outer shape is rectangular, and only one of the two edge portions in the longitudinal direction is entirely formed. A plurality of notched portions are continuously formed on the base plate, and a tube member having a communication channel from one of the two outflow ports to the other of the two outflow ports is formed by using a clad plate material. Subsequently, the communication channel and the outflow inlet are aligned with each other, and a longitudinal edge portion of one of the two tube members to be assembled facing each other in the longitudinal direction and the other edge portion are formed. Multiple tube members are laminated so that a plurality of flat heat exchange tubes configured by facing two tube members are laminated so as to be aligned with a longitudinal edge that is not formed. Assemble your body. Then, this is placed in a furnace having a temperature higher than the melting point of the brazing material and lower than the melting point of the plate material to join (braze) the contact portions to complete the heat exchanger of the present invention. For this reason, it is possible to more easily manufacture a heat exchanger having a good discharge property of dew condensation water and a high heat exchange efficiency. In addition, it is preferable that the notch has a V shape, a U shape, or a sawtooth wave shape.

It is a block diagram which shows the outline of a structure of the heat exchanger 20 of an Example. It is sectional drawing which shows the AA cross section in FIG. 1 typically. It is a block diagram which shows the outline of a structure of the tube 30 for heat exchange. It is a block diagram which shows the outline of a structure of the tube member 40. It is sectional drawing which shows the BB cross section in FIG. 1 and FIG. It is sectional drawing which shows CC cross section in FIG. 1 and FIG. It is a block diagram which shows the outline of a structure of the tube member 140 of a modification. It is a block diagram which shows the outline of a structure of the tube member 240 of a modification. It is a block diagram which shows the outline of a structure of the tube member 340 of a modification.

Next, modes for carrying out the present invention will be described using examples.

FIG. 1 is a configuration diagram showing an outline of a configuration of a heat exchanger 20 of an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing the AA cross section in FIG. 1. The heat exchanger 20 of the embodiment is used for a refrigerating cycle such as an air conditioner or a refrigerating device or a cooling device for equipment that operates with heat generation, and is composed of two tube members 40 as shown in FIG. A laminate 22 formed by laminating a plurality of heat exchange tubes 30, plates 23 arranged on both sides of the arrangement direction of the laminate 22 (vertical direction in the drawing), and a longitudinal direction of the heat exchange tubes (in the drawing). Plates 24 arranged on both sides (in the left-right direction), supply pipes 27 and discharge pipes 28 attached to the heat exchange medium inflow channels 25 and outflow channels 26 formed in the laminate 22 and the plate 23, Equipped with. The heat exchanger 20 has a heat exchange medium adjacent to a heat exchange medium such as hydrofluorocarbon or water supplied from the inflow passage 25 to two communication passages 34 and 35 formed in the heat exchange tube 30 described later. The heat exchange medium is heated or cooled, or the heat exchange medium is cooled or heated by heat exchange with a heat exchange medium such as air flowing in the gap between the tubes 30. In FIG. 2, the white arrows on the supply pipe 27 and the discharge pipe 28 indicate the directions of supply and discharge of the heat exchange medium, and the white arrows on the left and right of the heat exchanger 20 indicate the directions. , Shows the flowing direction of the heat exchange medium.

FIG. 3 is a configuration diagram showing an outline of the configuration of the heat exchange tube 30. FIG. 4 is a configuration diagram showing an outline of the configuration of the tube member 40 that constitutes the heat exchange tube 30. FIG. 5 is a cross-sectional view showing a BB cross section in FIGS. 1 and 3. FIG. 6 is a cross-sectional view showing a C-C cross section in FIGS. 1 and 3. The white arrow in FIG. 5 indicates the flowing direction of the heat exchange medium.

As shown in FIG. 3, the heat exchange tube 30 is configured by facing and joining two tube members 40. As shown in FIGS. 3 and 4, the tube member 40 has a brazing material such as aluminum-silicon alloy disposed on both sides of an aluminum plate material and rolled integrally to have a thickness of 0. It is formed by subjecting a so-called clad plate material having a thickness of 0.2 mm to press working, punching, and the like.

As shown in FIG. 4, the tube member 40 has two outflow-inlet through holes 41a and 41b formed in the center in the longitudinal direction (left-right direction in the drawing) so as to be arranged in series in the lateral direction. Two W-shaped communication flow path forming portions 44 and 45 are formed so as to communicate the two outflow inlet through holes 41a and 41b. Further, flange portions 42a and 42b are formed around the two outflow inlet through holes 41a and 41b. The two outflow inlet through-holes 41a, 41b and the flange portions 42a, 42b are mirror image symmetrical with respect to a straight line (horizontal line in FIG. 3) passing through the midpoint of the two outflow inlet through-holes 41a, 41b. The communication flow path forming portions 44 and 45 are formed so as to be mirror image symmetric with respect to a straight line (a vertical line in FIG. 3) passing through the centers of the two outflow-inlet through holes 41a and 41b. ..

Further, one of the edge portions 46a and 46b forming the two sides in the longitudinal direction of the tube member 40 (the upper edge portion in FIG. 3) is linearly formed, and the other edge portion is formed. 46b (the lower edge in FIG. 3) is formed in a shape in which a V-shaped notch 47 is continuously cut out over substantially the entire portion.

In the heat exchange tube 30, as shown in FIG. 3, the two tube members 40 face each other, and the edge portion 46a of one tube member 40 is aligned with the edge portion 46b of the other tube member 40. Face each other and configure. The two outflow-inlet through holes 41a, 41b and the flange portions 42a, 42b are formed so as to have mirror image symmetry, and the communication flow path forming portions 44, 45 are also formed so as to have mirror image symmetry. The two outflow-inlet through holes 41a, 41b and the two flange portions 42a, 42b of the tube member 40 and the two outflow-inlet through holes 41b, 41a and the two flange portions 42a, 42b of the other tube member 40 are They are aligned with each other to form an inflow channel 25 and an outflow channel 26. Further, the communication passage forming portions 44, 45 of the one tube member 40 and the communication passage forming portions 45, 44 of the other tube member 40 are aligned with each other to form the communication passages 34, 35.

In the heat exchange tube 30, when dew condensation water is generated, the dew condensation water is carried to the vicinity of the outflow end of the heat exchange medium, and in the vicinity of the outflow end, the cut-out portion 47 is continuous to the end of the edge 46b. Be guided. Since the area of the continuous notch 47 becomes smaller toward the end, the adhesive force due to the surface tension of the dew condensation water becomes smaller and is discharged to the outside at or near the end due to the flow of the heat exchange medium. On the other hand, considering a comparative example in which two sides in the longitudinal direction are formed by a straight line (one in which the slit 47 is not cut out continuously), the continuous slits 47 are not formed, and therefore continuous. It is not possible to obtain the effect of the notch 47. That is, in the heat exchange tube 30 of the example, since the continuous cut portion 47 is formed in the vicinity of the outflow end portion of the heat exchange medium, a comparative example in which the continuous cut portion 47 is not formed is obtained. In comparison, good discharge of condensed water can be obtained.

Further, in the heat exchange tube 30, as shown in FIG. 5, the flow cross-sectional area of the heat exchange medium has the notch 47 cut off at the inflow end of the heat exchange medium. The thickness is reduced by the thickness of the sheet (0.2 mm), and the width of the slit 47 is gradually reduced. The thickness is reduced by the thickness of two clad plate materials (0.4 mm), and is reduced by the thickness of the two clad plate materials (0.4 mm) plus the thickness of the communication channels 34 and 35. On the other hand, considering a comparative example, the flow cross-sectional area of the heat exchange medium is reduced by the thickness (0.4 mm) of two clad plate materials at the inflow end portion of the heat exchange medium, and from there, It becomes smaller by the thickness of the sheet (0.4 mm) plus the thickness of the communication channels 34, 35. Therefore, in the heat exchange tube 30 of the example, the flow cross-sectional area on the inflow side of the heat exchange medium gradually becomes smaller than that of the comparative example. Thereby, the flow resistance can be reduced.

In the embodiment, a plurality of heat exchanges are performed by stacking the two tube members 40 so that they face each other and the edge portion 46a of the one tube member 40 is aligned with the edge portion 46b of the other tube member 40. A stack 22 is formed by stacking the tubes 30 for use, and the plates 23, 24, the supply pipe 27, and the discharge pipe 28 are assembled to the stack 22, which is higher than the melting point of the brazing material and lower than the melting point of the plate material (for example, 610° C. or 620° C.). The heat exchanger 20 is completed by joining (brazing) the abutting portions by heating at a temperature such as °C. That is, the facing contact portions of the tube members 40 constituting the heat exchange tube 30 are joined and the contact portions of the flange portions 42a, 42b of the adjacent heat exchange tubes 30 are joined, and at the same time, the plates 23, 24 and the supply are supplied. The pipe 27 and the discharge pipe 28 are joined together.

In the heat exchanger 20 configured in this way, a heat exchange medium such as hydrofluorocarbon or water is supplied from the supply pipe 27 to the inflow passage 25 formed by the two outflow/inlet through holes 41a and 41b, and each heat exchange medium is heated. It flows through the communication passages 44 and 45 of the exchange tube 30, flows out into the outflow passage 26 formed by the two outflow inlet through holes 41a and 41b, and is discharged from the discharge pipe 28. On the other hand, a heat exchange medium such as air is supplied to the heat exchange tubes 30 from the outflow passage 26 side, flows through the gaps between the heat exchange tubes 30 to exchange heat with the heat exchange medium, It is discharged from the inflow channel 25 side. By supplying and discharging the heat exchange medium and the heat exchanged medium in this way, the flow of the heat exchange medium as a whole and the flow of the heat exchanged medium can be made to be a counter flow.

In the heat exchanger 20 described above, the notch 47 that is continuous with the edge portion 46b of the one tube member 40 that forms the heat exchange tube 30 is formed continuously, so that the inflow passage 25 side Condensation water can be satisfactorily discharged at the discharge end of the heat exchange medium. Further, the flow cross-sectional area of the heat exchanged medium gradually decreases on the outflow side of the heat exchanged medium on the outflow channel 26 side and gradually decreases on the discharge side of the heat exchanged medium on the inflow channel 25 side. growing. Therefore, it is possible to reduce the flow resistance as compared with the case where the tube member in which the continuous notch 47 is not formed is used. On the other hand, since the edge portion 46a of the one tube member 40 is arranged to face the edge portion 46b of the other tube member 40 so as to face each other, the heat transfer area of the heat exchange tube 30 is calculated as follows: It is similar to that which is not formed at all. Therefore, the heat exchange efficiency can be improved. As a result, it is possible to obtain a heat exchanger having good drainage of condensed water and high heat exchange efficiency.

In the method for manufacturing the heat exchanger 20 of the embodiment, the tube member 40 forming the flat heat exchange tube 30 by facing each other is formed by using the clad plate material, and a plurality of heat exchange tubes 30 are laminated. As described above, a plurality of tube members 40 are laminated to assemble the laminated body 22, and the laminated body 22 is put into a furnace having a temperature higher than the melting point of the brazing material and lower than the melting point of the plate material to join (braze) the abutting portion to heat the embodiment. The exchanger 20 is completed. Therefore, it is possible to more easily manufacture the heat exchanger 20 of the embodiment, which has a good drainage of the condensed water and a high heat exchange efficiency.

In the heat exchanger 20 of the embodiment, the V-shaped cut-out portion 47 is continuously formed on the one edge 46b of the tube member 40 in the longitudinal direction, but the shape of the cut-out portion 47 is the same. May have a slightly rounded V shape. Further, as shown in a modified example of the tube member 140 illustrated in FIG. 7, a U-shaped notch 147 may be continuously formed substantially entirely on one longitudinal edge 146b. Although not shown, substantially one entire edge portion in the longitudinal direction may be formed in a sawtooth shape.

In the heat exchanger 20 of the embodiment, the V-shaped notch 47 is continuously formed substantially entirely over only one edge 46b in the longitudinal direction of the tube member 40, which is illustrated in FIG. As shown in the modified tube member 240, a V-shaped notch 247 may be continuously formed on substantially the entire two edges 246a and 246b in the longitudinal direction. In this case, the heat transfer area of the heat exchange tube is slightly smaller, but the drainage of the condensed water is higher. Therefore, the heat exchange efficiency can be improved in the heat exchange under the condition that the effect of discharging the condensed water is greater than the slight decrease in the heat transfer area.

In the heat exchanger 20 of the embodiment, the two outflow-inlet through holes 41a and 41b and the two flange portions 42a and 42b are formed in the longitudinal center of the tube member 40 so as to be arranged in series in the lateral direction. However, as shown in the tube member 340 of the modified example of FIG. 9, two outflow-inlet through holes 341a, 341b and two flange portions 342a, 342b may be formed at both ends in the longitudinal direction thereof. Even in this case, one edge portion 346a in the longitudinal direction may be formed so as to be a straight line, and the other edge portion 346b may be formed with a V-shaped notch 47 that is substantially entirely formed continuously. ..

In the heat exchanger 20 of the embodiment, the V-shaped notch 47 is continuously formed substantially entirely over only one edge 46b in the longitudinal direction of the tube member 40. Alternatively, the V-shaped notched portion 47 may be partially or continuously formed.

In the heat exchanger 20 of the embodiment, the flange portions 42a and 42b are formed around the outflow inlet through holes 41a and 41b, but instead of the flange portions 42a and 42b, a burring portion is formed by burring processing. It may be one. In this case, the diameter of one burring part is slightly smaller than or slightly smaller than the diameter of the other burring part so that one burring part of the two burring parts of the tube member fits into the other burring part. It is preferable to make it large. By stacking the tube members having such burring portions so that the adjacent heat exchange tubes 30 are alternately superposed, the burring portions of the facing tube members can be fitted to each other.

In the heat exchanger 20 of the embodiment, the tube member 40 is formed by using a clad plate material having a thickness of 0.2 mm in which a brazing material such as an aluminum silicon alloy is bonded to both surfaces of an aluminum plate material. The tube member 40 may be formed using a clad plate material made of aluminum and an aluminum alloy thinner than 2 mm or a clad plate material made of aluminum and an aluminum alloy thicker than 0.2 mm. Alternatively, the tube member may be formed by using a clad plate material in which a brazing material such as copper or nickel is joined to both surfaces of a stainless steel plate material or a plate material in which stainless steel is plated on both surfaces. Furthermore, a brazing material may be bonded to both surfaces of a copper plate material, or a plated plate material may be used to form the tube member.

The embodiments for carrying out the present invention have been described above with reference to the embodiments. However, the present invention is not limited to these embodiments, and various embodiments are possible within the scope not departing from the gist of the present invention. Of course, it can be implemented.

INDUSTRIAL APPLICABILITY The present invention can be used in the heat exchanger manufacturing industry and the like.

20 heat exchanger, 22 laminated body, 23, 24 plate, 25 inflow passage, 26 outflow passage, 27 supply pipe, 28 discharge pipe, 30 heat exchange tube, 34, 35 communication passage, 40, 140 , 240, 340 Tube member, 41a, 41b, 341a, 341b Outlet inlet through hole, 42a, 42b, 342a, 342b Flange portion, 44, 45 Communication passage forming portion, 46a, 46b, 146a, 146b, 246a, 246b , 346a, 346b Edge portion, 47, 147, 247, 347 Trimming portion.

Claims (5)

A tube member formed so as to form a flat heat exchange tube having two outlets and outlets of a heat exchange medium and a communication channel communicating with each other by joining them facing each other using a metal material. Of a plurality of heat exchange tubes of adjacent heat exchange tubes are laminated so that the two outlets and inlets of the heat exchange tubes are aligned, and the heat exchange medium flowing between the heat exchange medium and the heat exchange tube adjacent to the heat exchange medium flows between the heat exchange tubes. A heat exchanger for exchanging heat with an exchange medium,
The tube member is formed with a plurality of notches on at least a part of the outer peripheral edge,
A heat exchanger characterized by that. The heat exchanger according to claim 1, wherein
The notch has any one of a V shape, a U shape, and a sawtooth wave shape.
Heat exchanger. The heat exchanger according to claim 1 or 2, wherein
The tube member has a rectangular shape, and only one of the two longitudinal edges facing each other is continuously formed with the notch, and
The heat exchange tube has a longitudinal edge in which one of the two tube members facing each other is formed with the notched portion and the other edge in the longitudinal direction at which the notched portion is not formed. It is assembled to match the department,
Heat exchanger. The heat exchanger according to claim 1 or 2, wherein
The tube member has a rectangular shape, and the notch portion is continuously formed over both of the two longitudinal edges facing each other.
The heat exchange tube is assembled so that the notches of two tube members that are joined face to face are aligned.
Heat exchanger. A method of manufacturing a heat exchanger,
A clad plate material having a thickness of 0.3 mm or less in which a second metal having a lower melting point than that of the first metal is bonded to a central material made of the first metal and has a rectangular outer shape and two edge portions in the longitudinal direction. A tube member forming step of forming a tube member having a communication channel extending from only one of the two outflow inlets to the other of the two outflow inlets, and a plurality of cutout portions are formed continuously only on one of the two outflow inlets; ,
One of the two tube members to be assembled facing each other such that the communication channel and the outflow inlet are aligned, and the longitudinal edge portion where the notch portion is formed and the other notch portion are A plurality of flat tube members for heat exchange are laminated so that a plurality of flat tube tubes for heat exchange are laminated so as to be aligned with a longitudinal edge which is not formed. Assembling process to assemble the laminated body by
A brazing step of brazing the laminated body using a furnace adjusted to a temperature lower than the melting point of the first metal and higher than the melting point of the second metal;
Of a heat exchanger having a.

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