CN103324258B - Heat exchanger and manufacturing method thereof - Google Patents

Abstract

A heat exchanger and a manufacturing method thereof, the heat exchanger comprises a base portion and a plurality of fins. The plurality of fins are arranged side by side on the base portion, each fin has a processing surface away from the base portion, these processing surfaces are recessed downward to form at least one groove together, and the groove extends along a slotting direction. In addition, each fin has two groove top surfaces at the groove, which are respectively connected to the processing surface, and the two groove top surfaces respectively form an obtuse angle with the processing surface. Therefore, the above structure can prevent the waste generated by the cutting process of the heat exchanger from being stuck between the fins, causing the flow channel of the heat exchanger to be blocked.

Description

Heat exchanger and manufacturing method thereof

technical field

The invention relates to a heat exchanger and a manufacturing method thereof, in particular to a heat exchanger with fins and a manufacturing method thereof.

Background technique

Currently, a heat dissipation module used in a rack server mostly adopts an air-cooled heat dissipation mode. The operating principle of the air-cooled heat dissipation mode is to install cooling fins on multiple heat sources in the chassis, and to set corresponding cooling fan modules in the chassis. The forced heat convection generated by the operation of the cooling fan module is used to dissipate heat from the heat source. However, in such a heat dissipation mode, the ambient temperature at the location of the chassis is very important, because the airflow driven by the air dissipation module flows through the heat source to remove the heat energy generated by the heat source, and the temperature of the environment is raised. Therefore, the existing air-cooled and heat-dissipating rack-mounted servers need to unify the direction of heat dissipation to generate hot aisles and cold aisles, so that the computer room can be used for environmental temperature control and management. If the ambient temperature of the computer room is poorly managed, the temperature of the servers will not be able to drop. However, with the gradual expansion of the computer room area, the server density in the computer room is also increasing. The ambient temperature of the computer room, the design of the cold aisle and hot aisle and Management is increasingly complex.

In contrast, the liquid-cooled heat dissipation module provides another heat dissipation mode. Since the liquid-cooled heat dissipation module is not cooled by air, the disadvantages of the above-mentioned air-cooled heat dissipation mode will not occur. The liquid-cooled heat dissipation module includes a cooling device and a cooling pipeline connected to the cooling device. The cooling device and the cooling pipeline are arranged on the cabinet, and the cooling pipeline is connected to a heat exchanger arranged on the heat source. The heat exchanger includes a chamber, and the chamber is provided with a plurality of side-by-side radiating fins, and a plurality of flow passages are formed between the radiating fins. The cooling device provides a cooling fluid, and the cooling fluid flows to the heat exchanger through the cooling pipeline, and flows through the flow channel in the heat exchanger. The cooling fluid exchanges heat with the heat dissipation fins in the flow channel, so as to remove the heat energy absorbed by the heat dissipation fins.

However, when milling the top edges of the cooling fins, cutting waste generated during the milling process tends to get stuck in the flow channels between the cooling fins. Moreover, part of the cooling fluid will vaporize into small bubbles after absorbing heat energy in the flow channel, and the cutting waste stuck in the flow channel will make it difficult for the small bubbles to escape. In this way, the cutting waste will hinder the cooling fluid, thereby affecting the heat dissipation efficiency.

Contents of the invention

The object of the present invention is to provide a heat exchanger and its manufacturing method, so as to solve the disadvantages caused by the height tolerance of the existing heat dissipation fins.

To achieve the above object, the present invention provides a method for manufacturing a heat exchanger, comprising:

A base material is provided, the base material includes a base part and a processed part on the base part, the processed part has a top surface, the base part has a bottom surface, the top surface and the bottom surface are located on the base part On opposite sides of the material, the top surface has at least one groove extending along a groove direction;

The processing part is formed into a plurality of side-by-side fins standing on the base part in a scraping and bending manner, and the fins are arranged side by side along the groove direction, and the groove runs through each of the fins , each of the fins has a machined surface away from the base portion; and

The processing surfaces are cut along a processing direction intersecting with the grooving direction, so that the distance from the processing surfaces to the bottom surface is less than or equal to a preset value.

In the above-mentioned manufacturing method of a heat exchanger, after the step of cutting the processing surfaces along the processing direction intersecting with the slotting direction so that the distance from the processing surfaces to the bottom surface is less than or equal to the preset value, further Include:

Provide an upper casing, which has an accommodating space and a liquid inlet and a liquid outlet connected to the accommodating space; and

The upper shell is assembled on the base part by means of welding, so that the fins are located in the accommodating space, and the liquid inlet and the liquid outlet are located at opposite ends of the fins, and the The processing surface is attached to the upper casing.

In the manufacturing method of the above heat exchanger, each of the fins has two groove top surfaces forming the groove, and the two groove top surfaces are connected to the processing surface and respectively form an obtuse angle with the processing surface.

The manufacturing method of the above-mentioned heat exchanger, wherein each of the fins also has two groove bottom surfaces forming the groove, one end of the two groove bottom surfaces is respectively connected to the two groove top surfaces, and the two groove top surfaces are respectively interposed between the processed Between the top surface of the two grooves and the bottom surface of the two grooves, a first angle of intersection is formed between the top surfaces of the two grooves, and a second angle of intersection is formed between the bottom surfaces of the two grooves, and the first angle of intersection is larger than the second angle of intersection.

The manufacturing method of the above-mentioned heat exchanger, wherein the groove includes a first groove formed by the top surface of the two grooves and a second groove formed by the bottom surface of the two grooves, and the depth of the first groove is less than the depth of the second channel.

The above-mentioned manufacturing method of the heat exchanger further includes manufacturing the base material by aluminum extrusion.

In the above-mentioned manufacturing method of the heat exchanger, wherein the processing direction is perpendicular to the slotting direction.

To achieve the above object, the present invention also provides a heat exchanger, comprising:

a base portion; and

A plurality of fins are arranged side by side on the base portion along a processing direction, each of the fins has a processing surface, the processing surface is located on the side of the fin away from the base portion, and the processing surfaces are recessed downwards and jointly form at least one groove, and the groove extends along a groove direction intersecting with the processing direction;

Wherein, each fin has two groove top surfaces at the groove, which are respectively connected to the processing surface, and the two groove top surfaces respectively form an obtuse angle with the processing surface.

In the above-mentioned heat exchanger, each of the fins also has two groove bottom surfaces forming the groove, one end of the two groove bottom surfaces is respectively connected to the two groove top surfaces, and the two groove top surfaces are respectively interposed between the processing surface and the Between the bottom surfaces of the two grooves, there is a first intersection angle between the top surfaces of the two grooves, and a second intersection angle between the bottom surfaces of the two grooves, and the first intersection angle is larger than the second intersection angle.

The above heat exchanger, wherein the groove includes a first groove formed by the top surface of the two grooves and a second groove formed by the bottom surface of the two grooves, and the depth of the first groove is smaller than that of the second groove. The depth of the channel.

According to the above-mentioned heat exchanger disclosed in the present invention and its manufacturing method, the grooves are jointly formed by recessing downward at the processed surface of the fins, and the top surface of the groove included in the groove forms an obtuse angle with the processed surface, Therefore, when the fins are cut along the machining direction with the tool, the cutting waste can be smoothly separated from the fins to avoid being stuck in the flow channel between the fins, so as to improve the heat dissipation efficiency of the heat exchanger.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the fabrication flowchart of the heat exchanger according to an embodiment of the present invention;

2A to 7B are schematic diagrams of the manufacturing process of a heat exchanger according to an embodiment of the present invention;

7C is a schematic diagram of the fabrication process of a heat exchanger according to another embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a heat exchanger according to another embodiment of the present invention.

Among them, reference signs

10 heat exchanger

30 knives

32 knives

100 substrates

110 base part

111 Bottom

120 Processing Department

121 Top

122 Groove

122a Groove Top

122b Groove bottom

123 First channel

124 Second channel

130 fins

131 processing surface

132 Runner

200 Upper case

201 storage space

210 Liquid inlet

220 Liquid outlet

detailed description

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

Please refer to FIG. 1 . FIG. 1 is a flow chart of manufacturing a heat exchanger according to an embodiment of the present invention. The heat exchanger in this embodiment can be applied to the liquid-cooled heat dissipation module in the servo cabinet to dissipate heat from the heat source in the servo cabinet. Among them, the production process of the heat exchanger is as follows:

Firstly, a base material is provided, the base material includes a base portion and a processing portion located on the base portion, the processing portion has a top surface, the base portion has a bottom surface, and the top surface and the bottom surface are located on opposite sides of the base material , the top surface has at least one groove extending along a groove direction (step S1).

Next, the processing part is formed into a plurality of side-by-side fins standing on the base part in the way of scraping and bending. The fin has a processed surface away from the base portion, each fin has two groove top surfaces forming grooves, the two groove top surfaces are connected to the processed surface, and respectively form an obtuse angle with the processed surface (step S2).

Next, the processing surfaces are cut along a processing direction intersecting with the grooving direction, so that the distance from the processing surfaces to the bottom surface is less than or equal to a preset value (step S3).

Next, an upper casing is provided, which has an accommodating space and a liquid inlet and a liquid outlet communicating with the accommodating space (step S4).

Next, the upper casing is assembled on the base so that the fins are located in the accommodating space, and the liquid inlet and the liquid outlet are located at opposite ends of the fins (step S5 ).

Please refer to FIG. 2A to FIG. 7B . FIG. 2A to FIG. 7B are schematic diagrams of a manufacturing process of a heat exchanger according to an embodiment of the present invention. Next, the production process of the heat exchanger will be introduced in detail:

First, a substrate 100 is provided, as shown in FIG. 2A . The material of the base material 100 can be but not limited to a metal, such as aluminum alloy, and the base material 100 can be made by aluminum extrusion, but not limited thereto. The substrate 100 includes a base portion 110 and a processing portion 120 located on the base portion 110 . Wherein, the processing portion 120 has a top surface 121 , the base portion 110 has a bottom surface 111 , and the top surface 121 and the bottom surface 111 are located on opposite sides of the substrate 100 , as shown in FIG. 2B . In addition, the top surface 121 has at least one groove 122 extending along a grooving direction d1 (as shown in FIG. 3 ), where the groove 122 can be formed by aluminum extrusion when the substrate 100 is made. squeezed. Alternatively, aluminum is extruded to form the substrate 100 , and then milled to form the groove 122 . In this embodiment, two grooves 122 are shown in FIG. 3 as an example, but not limited thereto.

Next, the processing part 120 is cut and bent to form a plurality of fins 130 arranged side by side and standing on the base part 110 . Furthermore, taking FIGS. 4A to 4C as an example, the so-called shoveling and bending method is to use a tool 30 to shovel the processing part 120 along a cutting direction d3 forming an acute angle θ1 with the top surface 121 (as shown in FIG. 4B ). shown) to form a unit of fins 130. Next, bend the fin 130 so that the fin 130 stands on the base portion 110 (as shown in FIG. 4C ). Next, the above steps are repeated to form all the fins 130 . Wherein, for the bent fins 130 erected on the base portion 110 , the distance h2 from the processed surface to the bottom surface 111 is greater than the distance h1 from the top surface 121 to the bottom surface 111 . Moreover, if the acute angle θ1 between the cutting direction d3 and the top surface 121 is smaller, the distance h2 from the bent surface of the fin 130 to the bottom surface 111 will be larger (that is, the height of the fin 130 will be higher ). Therefore, those skilled in the art can adjust the acute angle θ1 according to actual needs, so as to obtain a desired height of the fin 130 .

And continue to refer to FIG. 5A to FIG. 5D , the fins 130 are arranged side by side along the slotting direction d1 , and the groove 122 extends along the slotting direction d1 to pass through each fin 130 (as shown in FIG. 5A ). In addition, a channel 132 is formed between two adjacent fins 130 , and each fin 130 has a processing surface 131 away from the base portion 110 (as shown in FIG. 5B ). Each fin 130 has two groove top surfaces 122 a and two groove bottom surfaces 122 b forming the groove 122 (as shown in FIG. 5C ). The top surfaces 122a of the two grooves are connected to the processing surface 131 and form an obtuse angle θ2 with the processing surface 131 respectively (as shown in FIG. 5D ). In this way, it is possible to prevent the machining surface 131 from forming a steeply descending cross section at the groove 122 , thereby reducing the probability of cutting waste stuck into the flow channel 132 . In addition, one end of the second groove bottom surface 122b respectively extends from one end of the second groove top surface 122a toward the base portion 110 , and the second groove top surface 122a is respectively interposed between the processing surface 131 and the second groove bottom surface 122b. Wherein, the top surfaces 122a of the two grooves form a first intersection angle θ3, and the bottom surfaces 122b of the two grooves form a second angle of intersection θ4 (as shown in FIG. 5D ), and the first angle of intersection θ3 is larger than the second angle of intersection θ4. The above-mentioned first intersecting angle θ3 actually refers to the angle formed by the two groove top surfaces 122 a extending toward the base portion 110 and intersecting. In detail, the larger the first intersecting angle θ3 is (the larger the obtuse angle θ2 is), the less likely the fins 130 are to accumulate processing waste when the processing surface 131 is milled. Moreover, the fins 130 can obtain a larger heat dissipation area at the same time. But relatively speaking, when the width of the top surface of the trench 122 is the same, the larger the first intersection angle θ3 is, the shallower the depth of the trench 122 will be. The bottom of the fin 130 does not have the groove 122 , so that the air bubbles at the bottom of the fin 130 cannot escape and affect the heat dissipation efficiency of the fin 130 . Therefore, in order to take into account the heat dissipation effect and reduce the accumulation of processing waste on the fin 130 , the groove 122 in this embodiment has two groove top surfaces 122a with a first intersection angle θ3 and two groove bottom surfaces 122b with a second intersection angle θ4. On the one hand, the accumulation of processing waste on the fins 130 can be reduced; on the other hand, the air bubbles in the fins 130 can escape from the grooves 122 under the condition of cutting off the fewest fins 130 . In this way, the heat dissipation effect of the fins 130 can be maintained while the fins 130 have a large heat dissipation area, and the problem that the fins 130 will accumulate processing waste can be solved.

Please continue to refer to FIG. 5D. In this embodiment, the groove 122 includes a first channel 123 formed by two groove top surfaces 122a and a second channel 124 formed by two groove bottom surfaces 122b, and the first channel The depth D1 of 123 is smaller than the depth D2 of the second channel 124 . In other words, the first groove 123 (with a wider groove pitch) can be designed with a shallower depth D1, while the second groove 124 (with a narrower groove pitch) can be designed with a deeper depth D2. Among them, the reason why the depth D1 of the first groove 123 is smaller than the depth D2 of the second groove 124 is the same as the above, in order to allow the fin 130 to maintain a larger heat dissipation area while maintaining the heat dissipation effect of the fin 130 , and solve the problem that the fins 130 will accumulate processing waste.

Next, cut these fins 130 (as shown in FIG. 6A ) along a processing direction d2 intersecting with the slotting direction d1 with a cutter 32 (such as a milling cutter), so that the processing surface 131 of these fins 130 reaches the bottom surface 111. The maximum distance is less than or equal to a preset value h3 (as shown in FIG. 6B ). Among them, the preset value h3 can be defined according to actual needs, and its purpose is to control the height of the fin 130 within a certain range, so as to avoid the fin 130 from being too high to be separated from other components (such as FIG. 7A's upper housing 200) interferes. In addition, the processing direction d2 of this embodiment is substantially perpendicular to the grooving direction d1. Wherein, the so-called substantially vertical means that although the design value is a right angle, as long as it is within a reasonable processing error range, it can be regarded as vertical.

Wherein, since the groove top surface 122a of the groove 122 in the fin 130 of this embodiment forms an obtuse angle θ2 with the processing surface 131 , a steep section on the processing surface 131 is avoided, which is not conducive to the removal of cutting waste from the fin 130 . Therefore, the obtuse angle θ2 between the groove top surface 122a and the processing surface 131 in the fin 130 can make the cutting tool 32 cut the fin 130 along the processing direction d2, and the cutting waste can be relatively smoothly detached from the fin 130 to avoid being stuck on the two fins. In the channel 132 between the sheets 130.

Next, an upper casing 200 is provided, as shown in FIG. 7A . The upper housing 200 has an accommodating space 201 and a liquid inlet 210 and a liquid outlet 220 communicating with the accommodating space 201 .

Next, assemble the upper case 200 on the base portion 110 so that the fins 130 are located in the accommodating space 201, and the liquid inlet 210 and the liquid outlet 220 are located at opposite ends of the fins 130 (as shown in FIG. 7B shown). Wherein, the upper case 200 shown in FIG. 7B is assembled on the edge of the base part 110 , but this feature does not limit the present invention. For example, in other embodiments, the upper case 200 can also be assembled on the base part 110 , as shown in FIG. 7C .

In addition, the upper case 200 of this embodiment can be assembled on the base portion 110 by means of welding, but not limited thereto. In this embodiment, the processed surface 131 is substantially attached to the upper casing 200 to obtain a better heat dissipation effect. What is referred to here essentially means that the processed surface 131 is approximately attached to the upper casing due to processing errors. 200 cases are also included. In this way, when the cooling fluid flows into the accommodating space 201 from the liquid inlet 210, it will be avoided that the cooling fluid overflows from the gap between the top edges of the fins 130 and the upper housing 200 without contacting the fins. 130 contacts, thereby affecting the heat dissipation efficiency.

Please continue to refer to FIG. 7A and FIG. 7B , the heat exchanger 10 of this embodiment can be completed through the above manufacturing process. Wherein, the heat exchanger 10 includes the above-mentioned base part 110 and the above-mentioned fins 130 . The base part 110 has a bottom surface 111 . A plurality of fins 130 are arranged side by side on a side of the base portion 110 away from the bottom surface 111 , and each fin 130 has a processing surface 131 away from the base portion 110 . Moreover, the processing surfaces 131 are recessed downward to jointly form at least one groove 122 , and each groove 122 extends along the groove direction d1. Wherein, each fin 130 has two groove top surfaces 122 a at the groove 122 respectively connected to the processing surface 131 , and the two groove top surfaces 122 a respectively form an obtuse angle with the processing surface 131 .

In addition, the heat exchanger 10 of this embodiment further includes an upper casing 200 . The upper housing 200 has an accommodating space 201 and a liquid inlet 210 and a liquid outlet 220 communicating with the accommodating space 201 . The upper casing 200 is disposed on the base portion 110 , the fins 130 are located in the accommodating space 201 , and the liquid inlet 210 and the liquid outlet 220 are located at opposite ends of the fins 130 . Wherein, the processing surface 131 is substantially adhered to the upper casing 200 .

Please refer to FIG. 8 . FIG. 8 is a schematic structural diagram of a heat exchanger according to another embodiment of the present invention. In other embodiments, the groove 122 may also only have two groove top surfaces 122 a connected to the processing surface 131 and forming an obtuse angle, but the present invention is not limited thereto.

According to the heat exchanger and its manufacturing method of the above-mentioned embodiments, the grooves are jointly formed by recessing downward at the processing surface of the fins, and the top surface of the groove included in the groove forms an obtuse angle with the processing surface, so that when When the tool cuts the fins along the machining direction, the cutting waste will be able to escape from the fins more smoothly and avoid being stuck in the flow channel between the fins. Therefore, the structure and manufacturing method of such a heat exchanger can prevent the cutting waste from being easily stuck in the flow channel during processing and cause blockage, so as to improve the problem that the small air bubbles generated by the cooling fluid are not easy to escape, thereby improving the heat dissipation of the heat exchanger efficiency.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (9)

1. the manufacture method of a heat exchanger, it is characterised in that comprise:

Thering is provided a base material, this base material includes a base portion and the processing department being positioned in this base portion, should Processing department has an end face, and this base portion has a bottom surface, and this end face is positioned at the relative of this base material with this bottom surface Both sides, this end face has at least one groove extended along a fluting direction；

This processing department is formed in the way of backing-off cutting bending multiple side by side and be erected in the fin in this base portion, Along this fluting direction mutually the most side by side, and through this fin each of this groove, this fin each has those fins There is the machined surface away from this base portion；And

Cut those machined surfaces along the machine direction intersected with this fluting direction, make those machined surfaces to this end The distance in face is less than or equal to a preset value；

Wherein, this fin each has the two groove end faces forming this groove, and this two grooves end face connects this machined surface, And press from both sides an obtuse angle with this machined surface respectively.

The manufacture method of heat exchanger the most according to claim 1, it is characterised in that in along and this This machine direction that fluting direction is intersected cuts those machined surfaces, makes those machined surfaces little to the distance of this bottom surface In or equal to this preset value step after, also comprise:

One upper shell is provided, there is an accommodation space and connect the inlet and of this accommodation space and go out liquid Mouthful；And

This upper shell is mounted on this base portion with welding means, makes those fins be positioned at this accommodation space, and This inlet and this liquid outlet are positioned at the opposite end of those fins, and those machined surfaces fit in this upper casing Body.

The manufacture method of heat exchanger the most according to claim 1, it is characterised in that this fin each Sheet also has two groove bottom forming this groove, and one end of this two groove bottom connects this two grooves end face respectively, should Two groove end faces are respectively interposed between this machined surface and this two groove bottom, this two grooves end face folder one first angle of cut, and This two groove bottom folder one second angle of cut, and this first angle of cut is more than this second angle of cut.

The manufacture method of heat exchanger the most according to claim 3, it is characterised in that this groove bag Containing one first conduit that formed by this two grooves end face and one second conduit formed by this two groove bottom, and this The degree of depth of one conduit is less than the degree of depth of this second conduit.

The manufacture method of heat exchanger the most according to claim 1, it is characterised in that also comprise with Aluminium extruded means make this base material.

The manufacture method of heat exchanger the most according to claim 1, it is characterised in that this processing side To this fluting direction vertical.

7. a heat exchanger, it is characterised in that comprise:

One base portion；And

Multiple fins, are arranged side by side in this base portion along a machine direction, and this fin each has a processing Face, this machined surface is positioned at this fin side away from this base portion, those machined surface concave downward and common shape Become at least one groove, and this groove extends along the fluting direction intersecting at this machine direction；

Wherein, the two groove end faces that this fin each has at this groove, connect this machined surface respectively, these are two years old Groove end face presss from both sides an obtuse angle with this machined surface respectively.

Heat exchanger the most according to claim 7, it is characterised in that this fin each also has shape Becoming two groove bottom of this groove, one end of this two groove bottom connects this two grooves end face respectively, and this two grooves end face divides Not between this machined surface and this two groove bottom, this two grooves end face folder one first angle of cut, and this two groove bottom Press from both sides one second angle of cut, and this first angle of cut is more than this second angle of cut.

Heat exchanger the most according to claim 8, it is characterised in that this groove comprises by this two groove One first conduit that end face is formed and one second conduit that formed by this two groove bottom, and this first conduit is deep Degree is less than the degree of depth of this second conduit.