WO2020100897A1

WO2020100897A1 - Heat exchanger and heat exchanger manufacturing method

Info

Publication number: WO2020100897A1
Application number: PCT/JP2019/044343
Authority: WO
Inventors: 裕斗淺井
Original assignee: 三菱電機株式会社
Priority date: 2018-11-12
Filing date: 2019-11-12
Publication date: 2020-05-22
Also published as: JPWO2020100897A1

Abstract

A heat exchanger (1) comprises: a pair of header pipes (2) that are disposed with a space therebetween; and a plurality of heat transfer pipes (3) that are disposed between the pair of header pipes (2), that extend in a direction perpendicular to the pair of header pipes (2), and that form channels in which fluid flows from one of the pair of header pipes (2) to the other. In addition, in the cross-section formed by cutting the header pipes (2) and the heat transfer pipes (3) with a plane perpendicular to the longitudinal direction of the header pipe (2), the central axis (C3) of the heat transfer pipe (3) is shifted in the same direction with respect to a central line (C2) formed by connecting the center of the cross-sectional shape of one header pipe (2) and the center of the cross-sectional shape of the other header pipe (2).

Description

Heat exchanger and method for manufacturing heat exchanger

The present invention relates to a heat exchanger and a method for manufacturing the heat exchanger.

A heat exchanger is a device that performs heat exchange between the heat transport fluid flowing from an external device and the atmosphere, that is, radiates or absorbs heat, and then returns the heat transport fluid to the original external device. A general heat exchanger includes a pair of header pipes arranged in parallel with each other, a plurality of heat transfer pipes communicating between the pair of header pipes, and a large number of heat transfer pipes penetrating the plurality of heat transfer pipes. It is equipped with fins. Further, the plurality of heat transfer tubes extend in a direction orthogonal to the header tube and are arranged in parallel with each other.

Heat transfer fluid flows into one of the header tubes from an external device. The heat-transporting fluid that has flown into one of the header tubes flows through the heat transfer tube to the other header tube. While flowing through the heat transfer tube, the heat transport fluid exchanges heat with the atmosphere. The heat transfer fluid that has undergone heat exchange is returned to the original external device through the other header tube.

In the above heat exchanger, the heat transfer tube is generally fixed to the header tube by brazing. Further, the joint portion between the header tube and the heat transfer tube needs to be airtightly configured. Therefore, when fixing the heat transfer tube to the header tube, it is necessary to use a sufficient amount of brazing material. However, if a large amount of brazing filler metal is used, excess brazing filler metal may overflow from the joint between the header pipe and the heat transfer pipe, flow into the heat transfer pipe from the end of the heat transfer pipe, and solidify there. Occurs. When the surplus brazing material solidifies inside the heat transfer tube, the heat transfer tube is clogged and the performance of the heat exchanger deteriorates. On the other hand, if the amount of the brazing filler metal is reduced in order to prevent the excess brazing filler metal from overflowing, a gap may be formed in the brazing joint and the airtightness may be impaired. In this way, it is difficult to achieve both prevention of clogging of the heat transfer tube and ensuring of airtightness of the joint.

In Patent Document 1, as a method for solving this problem, the width of the gap between the outer peripheral surface of the heat transfer tube and the inner wall of the header tube is 0.05 mm on both sides in the width direction of the heat transfer tube of the heat exchanger. It is disclosed that the distance is 2 mm or less. According to Patent Document 1, the surplus brazing material flows into the gap between the outer peripheral surface of the heat transfer tube and the header tube to form a fillet, so that the surplus brazing material flows into the heat transfer tube and solidifies there. Is suppressed.

JP, 2009-168350, A

However, in the invention described in Patent Document 1, it is necessary to form gaps on both sides in the width direction of the heat transfer tube, so that there is a problem that the cross-sectional dimension of the header tube becomes large. As a result, there is a problem that the size of the heat exchanger becomes large.

The present invention has been made in view of the above problems, and is a heat exchanger capable of suppressing the occurrence of clogging of a heat transfer tube due to the inflow of a brazing filler metal, in which the header tube has a small cross-sectional shape. It is an object to provide an exchanger and a method for manufacturing such a heat exchanger.

In order to achieve the above-mentioned object, the heat exchanger according to the present invention includes a pair of header tubes that are spaced apart from each other, and is disposed between the pair of header tubes. A plurality of heat transfer tubes extending in a direction orthogonal to each other and forming a flow path for flowing a fluid from one of the pair of header tubes to the other. Then, in the cross-sectional shape obtained by cutting the header pipe and the heat transfer pipe in a plane orthogonal to the longitudinal direction of the header pipe, the central axis of the heat transfer pipe connects the center of one header pipe and the center of the other header pipe. It is displaced in the same direction with respect to the formed center line.

The heat exchanger according to the present invention is provided with a space between the header pipe and the heat transfer pipe, into which excess brazing material flows and is solidified there, only on one side of the heat transfer pipe. Therefore, according to the present invention, the dimension of the cross-sectional shape of the header pipe can be reduced.

The perspective view of the heat exchanger of the heat exchanger which concerns on embodiment of this invention. Front view of the heat exchanger shown in FIG. 1A. Sectional drawing which shows the heat exchanger described in FIGS. 1A and 1B by cutting along the plane indicated by the line AA ′ in FIG. 1B. Sectional drawing which cut | disconnects and shows the heat exchanger shown in FIG. 1A and FIG. 1B by the plane shown by BB 'line in FIG. 1B. Sectional drawing which shows the shape of the header pipe which concerns on a 1st modification according to FIG. The figure which shows the state which attached the heat transfer tube to the header tube of FIG. 4A. Sectional drawing which shows the shape of the header pipe which concerns on a 2nd modification according to FIG. The figure which shows the state which laminated | stacked and arranged two heat exchangers provided with the header pipe of FIG. 5A. The figure which shows the state which laminated | stacked the two heat exchangers provided with the header pipe of FIG. Sectional drawing which shows the shape of the header pipe which concerns on a 3rd modification according to FIG. The perspective view of the heat exchanger of the heat exchanger which concerns on a 4th modification. Front view of the heat exchanger shown in FIG. 7A Sectional drawing which shows the shape of the header pipe which concerns on a 5th modification according to FIG. A view of the distribution pipe provided in the header pipe shown in FIG. 8 as seen from the direction shown by arrow A in FIG. Sectional drawing which shows the shape of the header pipe which concerns on a 6th modification according to FIG. A view of the partition plate included in the header pipe shown in FIG. 10 as seen from the direction indicated by arrow A in FIG. It is a figure which shows the manufacturing process of the heat exchanger which concerns on embodiment of this invention, Comprising: The sectional view which shows the state of the heat exchanger before brazing according to FIG. Sectional drawing which shows the state after brazing the heat exchanger shown in FIG. 12A according to FIG.

Hereinafter, a heat exchanger according to an embodiment of the present invention and a method for manufacturing the heat exchanger will be described in detail with reference to the drawings. In each drawing, the same or equivalent parts are designated by the same reference numerals.

FIG. 1A is a perspective view of the heat exchanger 1 according to the embodiment of the present invention. FIG. 1B is a front view of the heat exchanger 1.

As shown in FIGS. 1A and 1B, the heat exchanger 1 includes two header tubes 2. The header tubes 2 are arranged at a distance from each other and are erected vertically. A plurality of heat transfer tubes 3 are arranged between the two header tubes 2. The heat transfer tube 3 is a member that forms a flow path for circulating a heat transport fluid between the two header tubes 2, and its longitudinal axis extends in the horizontal direction. Further, the heat transfer tubes 3 are arranged at equal intervals in the vertical direction. A large number of heat transfer fins 4 are arranged between the two header tubes 2. All the heat transfer tubes 3 penetrate all the heat transfer fins 4 and are brazed to the heat transfer fins 4. A pipe (not shown) for supplying a heat-transporting fluid from an external device (not shown) to the heat exchanger 1 is connected to one of the header pipes 2. The heat-transporting fluid that has flowed into the one header pipe 2 from the external device flows through the heat transfer pipe 3 to the other header pipe 2. The heat transport fluid exchanges heat with the atmosphere while passing through the heat transfer tube 3. That is, the heat transport fluid radiates heat to the atmosphere or absorbs heat from the atmosphere while passing through the heat transfer tube 3. When the temperature of the heat transport fluid is higher than the ambient temperature, the heat transport fluid releases its own heat to the atmosphere. When the temperature of the heat transfer fluid is lower than the ambient temperature, the heat transfer fluid absorbs heat from the atmosphere. After the heat exchange is completed, the heat transport fluid that has flowed into the other header pipe 2 is returned to the external device through a pipe (not shown) connected to the other header pipe 2.

In each drawing of the present application, the orthogonal coordinate system fixed to the heat exchanger 1 shown in FIGS. 1A and 1B is used. In the orthogonal coordinate system, the X axis is taken in the length direction of the heat transfer tube 3 and the Y axis is taken in the length direction of the header tube 2. The Z axis is taken in the direction orthogonal to the X axis and the Y axis. 2 and subsequent figures, it should be understood that the relationship with the overall configuration shown in FIGS. 1A and 1B is based on the orientation of each axis.

FIG. 2 is a cross-sectional view of the heat exchanger 1 cut along a plane orthogonal to the longitudinal direction of the header tube 2, that is, a plane shown by the line AA ′ in FIG. 1B. In FIG. 2, the X axis extends in the horizontal direction and the Z axis extends in the vertical direction. The Y axis extends in a direction that penetrates the plane of the drawing. As shown in FIG. 2, the header pipe 2 is a cylindrical pipe having a circular cross section. Further, the heat transfer tube 3 is attached at a position deviated to the upper side of the header tube 2 in FIG. 2, and the central axis C3 of the heat transfer tube 3 is with respect to the center line C2 connecting the centers of the two header tubes 2. , At a position displaced by a length D in the Z-axis direction. The length D is set so that a space 5 having a space width W is formed between the outer surface of the heat transfer tube 3 and the inner surface of the header tube 2 below the heat transfer tube 3. In this specification, the space existing between the outer surface of the heat transfer tube 3 and the inner surface of the header tube 2 in the cross-sectional shape of the heat transfer tube 3 is called a space, and the dimension of the space in the Z-axis direction is called a space width.

The heat transfer tube 3 is watertightly joined to the header tube 2 by brazing. The space 5 is a portion into which excess brazing material overflowing from the joint between the heat transfer tube 3 and the header tube 2 flows when the heat transfer tube 3 is brazed to the header tube 2. As will be described later, the excess brazing material that melts during the brazing and overflows from the joint between the heat transfer tube 3 and the header tube 2 flows into the space 5 by the action of gravity, and then is cooled and solidified there. Then, the fillet M is formed. In this way, the surplus brazing material flows into the space 5 and is solidified there, so that the surplus brazing material does not flow into the heat transfer tube 3 and block the heat transfer tube 3. The excess brazing material that melts when the heat transfer tube 3 is brazed to the header tube 2 and overflows from the joint between the heat transfer tube 3 and the header tube 2 does not flow above the heat transfer tube 3, so No space is required between the outer surface of the heat transfer tube 3 and the inner surface of the header tube 2 above. Therefore, the space width of the space can be zero. However, the space width of the space is not limited to zero.

FIG. 3 is a sectional view showing the heat exchanger 1 taken along the plane indicated by the line BB ′ in FIG. 1B. In FIG. 3, the Z axis extends in the horizontal direction and the Y axis extends in the vertical direction. The X axis extends in a direction that penetrates the plane of the drawing. As shown in FIG. 3, the heat transfer tube 3 has a flat cross section, and a plurality of flow paths 3a are arranged in the longitudinal direction of the flat cross section. Thus, in the present embodiment, heat transfer tube 3 is formed of a multi-hole flat tube. The left end of the heat transfer tube 3 in FIG. 3 is higher than the right end. Further, in the present embodiment, the external air flowing into the heat exchanger 1 flows from the left side to the right side in the figure. That is, in the present embodiment, the heat transfer tube 3 has a high upwind side and a low downwind side of the flow of the external air flowing into the heat exchanger 1. Therefore, when dew condensation occurs on the surface of the heat transfer tube 3, the water droplets generated by the dew condensation are quickly discharged by wind pressure and gravity. Since the water droplets are quickly discharged in this way, it is suppressed that the water droplets are further cooled on the spot and become frost or ice to block the air passage.

The shape and configuration of the heat exchanger 1 are not limited to the above. Below, the modification of the heat exchanger 1 is demonstrated.

(First modification)
FIG. 4A is a cross-sectional view showing the shape of the header pipe 2 according to the first modification according to FIG. As shown in FIG. 4A, the header tube 2 according to the first modification includes a contact surface 2b at a part of the peripheral edge of the insertion opening 2a into which the end of the heat transfer tube 3 is inserted. As shown in FIG. 4B, when the heat transfer tube 3 is attached to the header tube 2, a part of the end surface 3 b of the heat transfer tube 3 contacts the contact surface 2 b of the header tube 2. As described above, when the contact surface 2b is provided on a part of the peripheral edge of the insertion opening 2a of the header tube 2, the positioning of the heat transfer tube 3 when the heat transfer tube 3 is attached to the header tube 2 becomes easy.

(Second modified example)
FIG. 5A is a cross-sectional view showing the shape of the header pipe 2 according to the second modification according to FIG. In the header tube 2 according to the second modification, the outer dimension measured in the direction parallel to the heat transfer tube 3, that is, the dimension in the width direction indicated by B in FIG. 5A is the direction orthogonal to the heat transfer tube 3, that is, FIG. 5A. It is composed of a flat tube larger than the dimension in the height direction indicated by H. When the heat transfer tube 3 is formed of a flat tube, the height H can be made smaller than when the heat transfer tube 3 is formed of a cylindrical tube having the same cross-sectional area. Therefore, if the heat transfer tube 3 is formed of a flat tube, as shown in FIG. 5B, the stacking height LH when the plurality of heat exchangers 1 are stacked and arranged becomes small. As shown in FIG. 5C, the same applies to the case where a plurality of heat exchangers 1 are arranged in a stack with the header tubes 2 displaced in the width direction, that is, the X-axis direction.

(Third Modification)
FIG. 6 is a cross-sectional view showing the shape of the header pipe 2 according to the third modification according to FIG. As shown in FIG. 6, in the header tube 2 according to the third modified example, the contour of the portion 2c into which the heat transfer tube 3 is inserted has a straight line, and the portion of the portion 2d facing the portion 2c into which the heat transfer tube 3 is inserted is located. It is a D-shaped tube whose contour is an arc. Thus, if the contour of the portion 2c into which the heat transfer tube 3 is inserted is made straight, the portion can be used as a reference when fixing the header tube 2 to the jig for assembling the heat exchanger 1. Therefore, the header tube 2 Positioning with respect to the assembly jig becomes easy.

(Fourth Modification)
7A and 7B are external views of the heat exchanger according to the fourth modified example, FIG. 7A is a perspective view of the heat exchanger 1, and FIG. 7B is a front view of the heat exchanger 1. The basic configuration and operation of the heat exchanger 1 according to the fourth modified example are the same as those of the heat exchanger 1 according to the above-described embodiment and the first to third modified examples. As shown in FIGS. 7A and 7B, the heat transfer fins 4 included in the heat exchanger 1 according to the fourth modification are characterized by being formed by bending a flat plate in zigzag.

(Fifth Modification)
FIG. 8 is a cross-sectional view showing the shape of the header pipe 2 according to the fifth modified example according to FIG. As shown in FIG. 8, the header pipe 2 according to the fifth modification is provided with a distribution pipe 7 which is connected to an external device (not shown) and into which the heat transport fluid directly flows. Therefore, the cross-sectional shape of the header pipe 2 is connected to an external device (not shown) and the heat transfer fluid flows in from the external device, and the heat transfer pipe 3 is connected and the heat transfer fluid flows out toward the heat transfer pipe 3. It is divided into an outflow section 9 that allows it. As described above, in the fifth modified example, the distribution pipe 7 functions as a partition member that partitions the cross-sectional shape of the header pipe 2 into the inflow section 8 and the outflow section 9.

As shown in FIG. 9, a communication hole 10 that communicates between the inflow section 8 and the outflow section 9 is formed in a portion of the distribution pipe 7 that faces the end surface of the heat transfer tube 3. Therefore, the heat transport fluid that has flowed into the inflow section 8 from an external device (not shown) flows out to the outflow section 9 through the communication hole 10, flows toward the heat transfer tube 3, and flows into the heat transfer tube 3. .

As described above, since the heat exchanger 1 according to the fifth modification includes the distribution pipe 7 having the communication hole 10 formed inside the header pipe 2, the heat transfer pipe 3 is formed inside the header pipe 2. The turbulence of the flow of the heat-transporting fluid toward the side is suppressed. Therefore, the flow path resistance or pressure loss inside the header pipe 2 is reduced, and the heat transport fluid easily flows. In addition, if the arrangement or the direction of the communication hole 10 is adjusted, the disturbance of the flow of the heat transport fluid can be suppressed more effectively. Particularly, when the header pipe 2 into which the liquid flows, for example, the header pipe 2 on the inflow side of the heat exchanger 1 included in the outdoor unit of the air conditioner is provided with the distribution pipe 7, the flow of the heat transport fluid in the liquid state is disturbed. Since the flow resistance or pressure loss inside the header pipe 2 can be reduced by suppressing the pressure drop, the performance of the air conditioner is improved.

(Sixth Modification)
The partition member provided in the header pipe 2 is not limited to the distribution pipe 7. The partition member is not limited to one that partitions the header pipe 2 into two sections. The partition member may partition the cross-sectional shape of the header pipe 2 into a plurality of partitions of three or more.

FIG. 10 is a cross-sectional view showing the shape of the header pipe 2 according to the sixth modification according to FIG. As shown in FIG. 10, the header tube 2 according to the fifth modified example includes a first partition wall 11 that partitions the cross-sectional shape of the header tube 2 into an inflow section 8 and an outflow section 9. Further, the header pipe 2 includes a second partition wall 12 that partitions the inflow section 8 into a first inflow section 13 and a second inflow section 14. As described above, the header pipe 2 according to the sixth modified example includes the first partition wall 11 and the second partition wall 12, so that the cross-sectional shape of the header pipe 2 is the first inflow section 13 and the second partition wall. It is divided into three sections, an inflow section 14 and an outflow section 9. In this way, the first partition wall 11 functions as a partition member that partitions the cross-sectional shape of the header pipe 2 into the inflow section 8 and the outflow section 9. The second partition 12 functions as a second partition member that partitions the inflow section 8 into a plurality of sections.

As shown in FIG. 11, a communication hole 10 that connects between the first inflow section 13 or the second inflow section 14 and the outflow section 9 is provided in a portion of the first partition wall 11 facing the end surface of the heat transfer tube 3. Has been drilled. Therefore, the heat transport fluid that has flowed into the first inflow section 13 or the second inflow section 14 from an external device (not shown) flows out to the outflow section 9 through the communication hole 10 and travels toward the end surface of the heat transfer tube 3. Flowing. In addition, in the 1st partition 11 which concerns on a 6th modification, the arrangement | sequence of the communication hole 10 connected to the 1st inflow division 13 and the arrangement of the communication hole 10 connected to the 2nd inflow division 14 are arrange | positioned in a zigzag form. Has been done.

As described above, in the heat exchanger 1 according to the sixth modification, the inflow section 8 is further partitioned into the first inflow section 13 and the second inflow section 14, so that the flow path resistance in the header pipe 2 is reduced. Alternatively, the pressure loss can be further reduced. In the sixth modification, the inflow section 8 is divided into two sections, but the inflow section 8 may be divided into three or more sections. The header pipe 2 according to the sixth modification can be manufactured by integrally molding the entire header pipe 2 including the first partition wall 11 and the second partition wall 12 by extrusion molding.

(Method of manufacturing heat exchanger)
Finally, a method of manufacturing the heat exchanger 1 will be described. In manufacturing the heat exchanger 1, first, the header tube 2, the heat transfer tube 3, and the heat transfer fin 4 are each cut out from a material and manufactured. After that, the heat transfer fins 4 are arranged, the heat transfer tubes 3 are inserted into the arranged heat transfer fins 4, and the heat transfer tubes 3 are attached to the heat transfer fins 4. The heat transfer fins 4 are arranged and positioned, and the heat transfer tubes 3 are inserted by fixing the heat transfer fins 4 to an assembly jig. After that, a brazing material is applied to the outer surface of the header tube 2 and the outer surface of the end of the heat transfer tube 3.

After applying the brazing material to the outer surfaces of the header tube 2 and the heat transfer tube 3, attach the heat transfer tube 3 to which the heat transfer fins 4 are attached to the header tube 2. Specifically, the tip of the heat transfer tube 3 is inserted into the insertion opening 2a of the header tube 2 shown in FIG. 4A. As a result, the heat exchanger 1 is temporarily assembled, and the outer shape shown in FIGS. 1A and 1B is completed.

Next, as shown in FIG. 12A, the temporarily assembled heat exchanger 1 is temporarily placed on the surface plate 6. At this time, the header tube 2 and the heat transfer tube 3 are made horizontal. That is, the heat exchanger 1 is temporarily placed on the surface plate 6 with the XY plane horizontal. At this time, the Z axis extends in the vertical direction. That is, at this time, gravity acts in the Z-axis direction. At this time, the central axis C3 of the heat transfer tube 3 is located above the central line C2 connecting the centers of the two header tubes 2. As a result, the space width W is arranged below the heat transfer tube 3. In addition, a temporary placement jig is provided instead of the surface plate 6, the temporarily assembled heat exchanger 1 is placed on the temporary placement jig, and the heat exchanger 1 is positioned using the temporary placement jig. Alternatively, it may be fixed.

As shown in FIG. 12A, when the temporarily assembled heat exchanger 1 is temporarily placed on the surface plate 6, the heat exchanger 1 is heated to melt the brazing material. That is, brazing is performed. When the brazing material melts, the excess brazing material overflowing from the joint portion between the heat transfer tube 3 and the header tube 2 flows along the outer surface of the heat transfer tube 3 and flows toward the space 5 below the heat transfer tube 3 due to gravity. As a result, when the brazing process is completed, the surplus brazing material is solidified under the heat transfer tube 3 to form the fillet M, as shown in FIG. 12B. In this way, the excess brazing material overflowing from the joint between the heat transfer tube 3 and the header tube 2 is solidified below the heat transfer tube 3 to form the fillet M. Therefore, the excess brazing material overflowing from the joint between the heat transfer tube 3 and the header tube 2 does not flow into the heat transfer tube 3 and block the heat transfer tube 3.

As described above, when the above manufacturing method is applied to the heat exchanger 1 according to the above-described embodiment and the first to sixth modifications, the excess brazing material flows into the heat transfer tube 3, It is possible to prevent the heat transfer tube 3 from being clogged. Further, as shown in FIG. 2, in the heat exchanger 1, a space 5 having a space width W is formed between one end in the Z-axis direction in the cross-sectional shape of the heat transfer tube 3 and the inner surface of the header tube 2, The space width of the space 5 between the other end of the heat transfer tube 3 in the Z-axis direction in the cross-sectional shape and the inner surface of the header tube 2 can be made smaller than W or 0. Therefore, as compared with the case where the space 5 having the space width W is formed on both sides of the cross section of the heat transfer tube 3 in the Z axis direction, the dimension in the width direction in the cross section of the header tube 2, that is, the dimension of the header tube 2 in the Z axis direction is set. Can be made smaller.

The above-described embodiment is merely an example of the embodiment of the present invention, and the technical scope of the present invention is not limited by the above-described embodiment. The present invention can be freely applied, modified or improved within the scope of the technical idea described in the claims.

In the above-mentioned embodiment and modification, the heat transfer fin 4 is not an essential component. That is, the heat exchanger 1 may not include the heat transfer fins 4. Further, when the heat exchanger 1 is provided with the heat transfer fins 4, the shape of the heat transfer fins 4 is not limited to that shown in FIGS. Further, the heat transfer fins 4 may be formed integrally with the heat transfer tube 3.

The shape and dimensions of the header pipe 2 are not limited to those shown in each drawing. The shape and size of the header tube 2 can be freely designed. Further, the number of heat transfer tubes 3 and the number of heat transfer fins 4 can be freely selected.

In the above, a flat multi-hole tube is shown as a specific example of the heat transfer tube 3, but the specific shape of the heat transfer tube 3 is not limited to the flat multi-hole tube. The heat transfer tube 3 may have a single flow path. The cross-sectional shape of the heat transfer tube 3 can be freely selected. The cross-sectional shape of the heat transfer tube 3 may be a perfect circle or an ellipse, a rectangle or another shape.

The materials forming the header tube 2 and the heat transfer tube 3 are not limited. For the material forming the header tube 2 and the heat transfer tube 3, the optimum material can be selected according to the purpose of use of the heat exchanger 1, the environment of the installation location, the properties of the heat transport fluid, and the like. The type of brazing material is not limited. The brazing material may be used by selecting a type having a good compatibility with the material forming the header tube 2 and the heat transfer tube 3.

In the above description, the length D is set to a size such that the space 5 having the space width W is formed between the outer surface of the heat transfer tube 3 and the inner surface of the header tube 2 below the heat transfer tube 3. The space width W may be any size as long as it corresponds to the volume of the fillet M formed by the excess brazing material overflowing from the joint between the header tube 2 and the heat transfer tube 3 during brazing. That is, the space 5 has only to have a size such that the excess brazing material overflowing from the joint between the header tube 2 and the heat transfer tube 3 at the time of brazing can be held there. Therefore, at the time of brazing, the amount of excess brazing material overflowing from the joint between the header tube 2 and the heat transfer tube 3 may be estimated to determine the space width W corresponding to it.

In the above description, the example in which the heat transfer tube 4 is attached to the heat transfer tube 3 and then the heat transfer tube 3 is attached to the header tube 2 has been shown, but the order of assembling the header tube 2, the heat transfer tube 3 and the heat transfer fin 4 is limited. Not done. As described above, the heat exchanger 1 may not include the heat transfer fins 4, or the heat transfer tubes 3 may be attached to the header tubes 2 and fixed by brazing before heat transfer to the heat transfer tubes 3. The fin 4 may be attached.

In the description of the manufacturing method of the heat exchanger 1, the temporary placement posture of the heat exchanger 1, the vertical axis of the central axis C3 of the heat transfer tube 3 and the central line C2 of the header tube 2 are limited. However, these limit the posture of the heat exchanger 1 when brazing, and do not limit the posture of the heat exchanger 1 during installation or use. The heat exchanger 1 is used by being installed vertically, horizontally, diagonally, or inverted upside down.

Further, in the description of the manufacturing method of the heat exchanger 1, it is shown that the header tube 2 and the heat transfer tube 3 are horizontal and the heat exchanger 1 is temporarily placed on the surface plate 6, but in this case, “horizontal” Is not limited to "geometrically exact horizontal". In this case, it is sufficient for the heat exchanger 1 to be temporarily placed so that the space width W is located below the heat transfer tube 3. Therefore, “temporarily placing horizontally” means that the header tube 2 and the heat transfer tube 3 are temporarily placed so that they can be seen horizontally at a glance.

The present invention allows various embodiments and modifications without departing from the broad spirit and scope of the present invention. Further, the above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. That is, the scope of the invention is indicated by the claims, not the embodiments. Various modifications made within the scope of the claims and the scope of the invention equivalent thereto are considered to be within the scope of the present invention.

This application is based on Japanese Patent Application No. 2018-211997 filed on November 12, 2018. The specification of Japanese Patent Application No. 2018-211997, the claims, and the entire drawing are incorporated herein by reference.

The present invention can be suitably used as a heat exchanger and a heat exchanger manufacturing method.

1 heat exchanger, 2 header pipe, 2a insertion opening, 2b contact surface, 2c, 2d site, 3 heat transfer tube, 3a flow path, 4 heat transfer fin, 5 space, 6 surface plate, 7 minute pipe, 8 inflow section , 9 outflow section, 10 communication hole, 11 first partition, 12 second partition, 13 first inflow section, 14 second inflow section, C2 center line, C3 center axis, W space width, M fillet.

Claims

A pair of header tubes spaced apart,
A plurality of flow paths that are arranged between the pair of header tubes and extend in a direction orthogonal to the pair of header tubes to form a flow path for flowing a fluid from one of the pair of header tubes to the other. And a heat transfer tube of
In the cross-sectional shape obtained by cutting the header pipe and the heat transfer pipe in a plane orthogonal to the longitudinal direction of the header pipe, the central axis of the heat transfer pipe is the center of the one header pipe and the center of the other header pipe. Deviated in the same direction with respect to the center line formed by connecting and
Heat exchanger.
The header tube and the heat transfer tube are joined by brazing,
The heat exchanger according to claim 1.
A space between the outer surface of the heat transfer tube and the inner surface of the heat transfer tube is wide on one side of the heat transfer tube and narrow on the other side at a portion inside the header tube that intersects with the heat transfer tube. Is
The heat exchanger according to claim 2.
A space between the outer surface of the heat transfer tube and the inner surface of the heat transfer tube on one side of the heat transfer tube in a portion intersecting with the heat transfer tube inside the header tube is formed wider than the other side. A fillet is formed on the part,
The heat exchanger according to claim 3.
The header tube includes a contact surface that abuts an end surface of the heat transfer tube, at least at a part of a peripheral edge of an insertion opening into which an end of the heat transfer tube is inserted.
The heat exchanger according to any one of claims 1 to 4.
The header tube is an elliptical tube whose cross-sectional shape cut along a plane orthogonal to the longitudinal direction of the header tube is elliptical.
The heat exchanger according to any one of claims 1 to 5.
The header tube has a cross-sectional shape cut along a plane orthogonal to the longitudinal direction of the header tube, and an outer dimension measured in a direction parallel to the heat transfer tube is larger than an outer dimension measured in a direction orthogonal to the heat transfer tube. Is also a large flat tube,
The heat exchanger according to any one of claims 1 to 5.
In the header pipe, in a cross-sectional shape cut along a plane orthogonal to the longitudinal direction of the header pipe, a contour of a portion into which the heat transfer tube is inserted is a straight line, and a contour of a portion facing the straight line is a circular arc. Is a D-shaped tube
The heat exchanger according to any one of claims 1 to 5.
The heat transfer tube, in its cross-sectional shape, is a multi-hole flat tube in which a plurality of flow paths are arranged in series,
The heat transfer tube has a windward end of a flow of air passing between the plurality of heat transfer tubes that is higher than a leeward end of the air flow.
The heat exchanger according to any one of claims 1 to 8.
In the cross-sectional shape of the header pipe on the side where the heat-transporting fluid flows from the external device, taken along a plane orthogonal to the longitudinal direction of the header pipe, the cross-sectional shape is connected to the external device and the heat from the external device is applied. And a partition member that is connected to the heat transfer tube and partitions into an outflow section that allows the transport fluid to flow out toward the heat transfer tube,
The partition member is provided with a communication hole that communicates between the inflow section and the outflow section at a portion facing each of the plurality of heat transfer tubes.
The heat exchanger according to any one of claims 1 to 9.
A second partition member for partitioning the inflow section into a plurality of sections,
The heat exchanger according to claim 10.
The method for manufacturing a heat exchanger according to any one of claims 1 to 11, wherein the heat transfer tube is fixed to the header tube by brazing.
Attaching the heat transfer tube to the header tube, and temporarily assembling the heat exchanger,
A step of temporarily placing the temporarily assembled heat exchanger, with the central axis of the header tube being above the center line of the header tube;
Brazing the heat transfer tube to the header tube;
A method for manufacturing a heat exchanger comprising: