JP2018124000A - Microchannel heat exchanger and manufacturing method thereof - Google Patents

Abstract

[PROBLEMS] To reduce the manufacturing cost of a micro-channel heat exchanger by sealing a gap between a sheath tube and a hole through which the sheath tube is attached or by eliminating a process such as welding for attaching the sheath tube. In this microchannel heat exchanger, a flanged sheath tube 4A enclosing a temperature sensor 141 is provided with a flange 103, and the flange 103 is joined to a metal plate constituting an upper protective plate 3B by diffusion bonding. . This joint portion serves as a seal, and the fluid in the heat exchanger body 2 allows the fluid in the sheath tube 4A of the flanged sheath tube 4A to pass through the inner wall surface of the through-hole 121 opened in the upper protection plate 3B and the sheath tube 101. It is possible to prevent leakage through a gap with the outer peripheral surface. [Selection] Figure 9

Description

  The present invention relates to a micro flow channel heat exchanger configured by stacking a plurality of heat transfer plates in which a flow channel for heat exchange fluid is formed, and a manufacturing method thereof.

  There is known a micro-channel heat exchanger having a structure in which two types of heat transfer plates in which micro-channels are formed on a metal plate such as stainless steel are alternately stacked. In this type of heat exchanger, in order to measure the temperature of the fluid flowing through the inside, a temperature sensor covered with a protective tube such as a sheath tube was inserted into the heat exchanger and a hole was formed in the heat exchanger. (For example, refer to Patent Document 1).

JP2015-190705A

  However, when the protective tube is inserted into the heat exchanger through the hole opened in the heat exchanger as described above, the gap between the hole opened in the heat exchanger and the surface of the protective tube passes through the heat exchanger. Processes such as sealing gaps to prevent fluid from leaking and welding a protective tube to the heat exchanger body are required separately after the heat exchanger is formed, causing the manufacturing process to be complicated. It was.

  In view of the circumstances as described above, an object of the present invention is to provide a micro-channel heat exchanger capable of reducing the manufacturing process and a manufacturing method thereof.

In order to achieve the above object, a microchannel heat exchanger according to an aspect of the present invention is provided.
A flow path layer laminate in which a plurality of first heat transfer plates provided with high-temperature fluid flow paths and a plurality of second heat transfer plates provided with low-temperature fluid flow paths are alternately stacked;
A protective plate joined to at least one surface in the stacking direction of the flow path layer stack;
A sheath tube having a flange and enclosing a temperature sensor;
The protective plate has a through-hole penetrating in the stacking direction of the protective plate, and a flange accommodating portion recessed in the stacking direction of the protective plate around the through-hole,
The sheath tube penetrates the through hole;
The flange is accommodated in the flange accommodating portion,
The flow path laminate, the protective plate, and the flange are integrally joined.

In addition, the manufacturing method of the microchannel heat exchanger according to another embodiment of the present invention,
A plurality of first heat transfer plates provided with a flow path for high-temperature fluid and a plurality of second heat transfer plates provided with a flow path for low-temperature fluid are alternately stacked and stacked, and at least one of the stacking directions Disposing at least one first metal plate having a hole for forming a through-hole penetrating in the laminating direction on the surface;
Disposing a second metal plate having a flange accommodating portion on the first metal plate;
On the first metal plate, the flange housing portion is inserted into the through hole through the sheath tube portion on the other side of the flange of the metal flanged sheath tube having one end closed. Step to be placed on,
Integrating at least the one or more first metal plates, the flange of the flanged sheath tube, and the second metal plate by diffusion bonding.

Furthermore, in the manufacturing method of the microchannel heat exchanger described above,
When the flange that is thinner than the second metal plate is accommodated in the flange accommodating portion of the second metal plate, before the step of placing the flange, the thickness of the second metal plate and the flange And placing a metal spacer having a thickness difference on the first metal plate on the first metal plate.

  According to the present invention, the facing surfaces in the stacking direction of the flange accommodating portion of the protective plate and the flange accommodated in the flange accommodating portion are joined to each other, and the flanged sheath tube is integrally attached to the heat exchanger body. Therefore, since the sheath tube is attached, a process such as welding becomes unnecessary, and the manufacturing process can be simplified.

It is a perspective view which shows the microchannel heat exchanger which concerns on one Embodiment of this invention. FIG. 2 is a partially exploded perspective view of the microchannel heat exchanger of FIG. 1. It is a perspective view which shows the structure of a high temperature heat exchanger plate in the microchannel heat exchanger of FIG. It is a perspective view which shows the structure of a low-temperature heat exchanger plate in the microchannel heat exchanger of FIG. It is a perspective view for demonstrating the high temperature channel of a high temperature channel layer in the microchannel heat exchanger of FIG. It is a perspective view for demonstrating the low temperature channel of a low temperature channel layer in the microchannel heat exchanger of FIG. It is sectional drawing which shows the structure of a sheath tube with a flange. It is sectional drawing which shows the attachment structure of the sheath tube with a flange of FIG. It is sectional drawing which shows the state which enclosed the temperature sensor in the sheath tube with a flange attached to the upper side protection board. It is sectional drawing which shows the modification of 4 A of sheath tubes with a flange. It is sectional drawing which shows the modification of the attachment structure of 4 A of sheath pipes with a flange. It is sectional drawing which shows another modification of the attachment structure of 4 A of sheath pipes with a flange. It is sectional drawing which shows another modification of the attachment structure of 4 A of sheath pipes with a flange. It is the upper side figure and side sectional drawing which show another modification of 4 A of sheath pipes with a flange. It is sectional drawing which shows the example in which the diffusion joining of a 2nd metal plate fails. It is sectional drawing which shows another modification of the attachment structure of 4 A of sheath pipes with a flange.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a microchannel heat exchanger according to a first embodiment of the present invention, and FIG. 2 is a partially exploded perspective view showing the microchannel heat exchanger of FIG.

[Overall configuration]
As shown in these drawings, the micro-channel heat exchanger 1 includes a heat exchanger body 2, which is a channel layer laminate, a lower protection plate 3A, an upper protection plate 3B, and a high-temperature fluid inlet. 5A, a high temperature fluid outlet connection portion 5B, a low temperature fluid inlet connection portion 5C, and a low temperature fluid outlet connection portion 5D.

  In the figure, the lower surface of each member such as the heat exchanger body 2, the lower protective plate 3A and the upper protective plate 3B is referred to as “lower surface” or “lower surface”, and the upper surface of each member is referred to as “upper surface”. "Surface" or "upper surface". A lower protective plate 3A is joined to the lower surface of the heat exchanger body 2, and an upper protective plate 3B is joined to the upper surface of the heat exchanger body 2. The connecting portions 5A, 5B, 5C, and 5D are for attaching the hot inlet pipe 8A, the hot outlet pipe 8B, the cold inlet pipe 8C, and the cold outlet pipe 8D, which will be described later, to the heat exchanger body 2, respectively.

  The heat exchanger body 2 is configured by alternately stacking two types of heat transfer plates 2A and 2B. The two types of heat transfer plates 2A and 2B constituting the heat exchanger body 2 are made of, for example, the same type of thin metal plate (foil). As the metal plate (foil), for example, a stainless steel thin plate is used.

  The lower protective plate 3A is composed of a plurality of thin metal plates (foils) stacked by diffusion bonding. As the metal plate (foil), for example, a stainless steel thin plate is used.

  The upper protection plate 3B is composed of a plurality of metal plates stacked in the same manner as the lower protection plate 3A. As the metal plate, for example, a stainless steel thin plate is used.

After these metal plates are laminated, they are joined together by diffusion joining to form a laminate having a substantially rectangular parallelepiped shape. In the figure, each layer of the laminate is depicted, but in reality, each layer has an ordered structure by diffusion bonding. For example, the layers are integrated and the interface disappears.
The materials constituting the heat exchanger are not limited to the same type. More specifically, stainless steel and titanium are used. There are also examples of stainless steel and ceramics.
The shape after lamination is not limited to a substantially rectangular parallelepiped. More specifically, if round plates are stacked, a cylindrical shape is obtained.
Hereinafter, the upper and lower surfaces perpendicular to the Z-axis of the micro-channel heat exchanger 1 are referred to as “main surfaces” based on the X-axis, Y-axis, and Z-axis in the drawing as necessary for explanation. The four surfaces perpendicular to the X axis and Y axis other than the main surface are referred to as “side surfaces”.

  As shown in FIG. 2, on each side surface of the micro-channel heat exchanger 1, a high-temperature fluid inlet 21 for allowing a high-temperature fluid to flow into a high-temperature channel in the heat exchanger body 2, and the heat exchanger body 2, respectively. A high-temperature fluid outlet 22 through which the high-temperature fluid flows out from the high-temperature flow path, a low-temperature fluid inlet 23 through which the low-temperature fluid flows into the low-temperature flow path in the heat exchanger body 2, and A cryogenic fluid outlet 24 is formed through which fluid flows out.

  As shown in FIG. 1, connecting portions 5A, 5B, 5C, and 5D are joined to the hot fluid inlet 21, the hot fluid outlet 22, the cold fluid inlet 23, and the cold fluid outlet 24 by welding or the like, respectively. A pipe (not shown) for inflow of the high temperature fluid is detachably connected to the connecting portion 5A of the high temperature fluid inlet 21. A pipe (not shown) for discharging the high temperature fluid is detachably connected to the connecting portion 5B of the high temperature fluid outlet 22. A pipe (not shown) for inflow of the cryogenic fluid is detachably connected to the connecting portion 5C of the cryogenic fluid inlet 23. A pipe (not shown) for allowing the low temperature fluid to flow out is detachably connected to the connecting portion 5D of the low temperature fluid outlet 24.

[Configuration of Heat Exchanger Body 2]
Next, the configuration of the heat exchanger body 2 will be described.
As described above, the heat exchanger body 2 is configured by alternately stacking two types of first heat transfer plates 2A and second heat transfer plates 2B. Grooves and notches are formed in these heat transfer plates 2A and 2B by etching. The first heat transfer plate 2A and the second heat transfer plate 2B have different patterns of grooves and notches.

  3 and 4 are perspective views showing two types of heat transfer plates 2A and 2B. Here, the first heat transfer plate 2A shown in FIG. 3 is a “high temperature heat transfer plate 2A”, and the second heat transfer plate 2B shown in FIG. 4 is a “low temperature heat transfer plate 2B”.

(Configuration of high-temperature heat transfer plate 2A)
As shown in FIG. 3, the high-temperature heat transfer plate 2A is provided with grooves 25A, 30A, 31A and notches 26A, 27A, 28A, 29A that form flow paths for high-temperature fluid, respectively. The grooves 25A, 30A, 31A are provided only on one surface of the high temperature heat transfer plate 2A. The depths of the grooves 25A, 30A, 31A may be uniform everywhere. The notches 26A, 27A, 28A, 29A are formed by removing predetermined portions of the edge portions corresponding to the four sides of the base material of the high-temperature heat transfer plate 2A by the thickness of the base material.

  Thereafter, as required for the description, the notches 26A, 27A, 28A, 29A of the high-temperature heat transfer plate 2A are replaced with the first notch 26A, the second notch 27A, and the third notch. This is referred to as a portion 28A and a fourth cutout portion 29A.

  In the high-temperature heat transfer plate 2A, an area between the first cutout portion 26A and the second cutout portion 27A that are provided to face each other in the Y-axis direction in the drawing includes the first cutout portion 26A and the second cutout portion 26A. A plurality of grooves 25A, 30A, 31A communicating with the second cutout portion 27A are formed. In FIG. 3, the number of the grooves 25 </ b> A is three, but a number of grooves smaller than three or larger than three may be formed.

  The grooves 25A, 30A, 31A in the high-temperature heat transfer plate 2A are a plurality of grooves 25A formed along the X-axis direction and two grooves 30A, 31A formed along the Y-axis direction. . One groove 30A of the two grooves 30A, 31A formed along the Y-axis direction communicates with one end of the first cutout portion 26A, and the other groove 31A has one end of the second cutout portion 27A. Communicate with. A plurality of grooves 25A formed along the X-axis direction communicate between the two grooves 30A and 31A. Thereby, the high temperature fluid inlet 21 and the high temperature fluid outlet 22 of the high temperature heat transfer plate 2A are disposed on the side surface orthogonal to the X axis of the heat exchanger body 2 at the low temperature fluid inlet 23 and the low temperature fluid outlet 24 of the low temperature heat transfer plate 2B described later. Is located on the side surface of the heat exchanger body 2 perpendicular to the Y axis.

(Configuration of low temperature heat transfer plate 2B)
As shown in FIG. 4, the low-temperature heat transfer plate 2B is provided with grooves 25B and notches 26B, 27B, 28B, and 29B that form low-temperature fluid flow paths. The groove 25B is provided only on one surface of the low-temperature heat transfer plate 2B. The depth of the groove 25B may be uniform everywhere. The notches 26B, 27B, 28B, and 29B are formed by removing predetermined portions of the edge portions corresponding to the four sides of the base material of the low-temperature heat transfer plate 2B by the thickness of the base material.

  Thereafter, as required for the description, the notches 26B, 27B, 28B, 29B of the low-temperature heat transfer plate 2B are replaced with the fifth notch 26B, the sixth notch 27B, and the seventh notch. These are referred to as a portion 28B and an eighth cutout portion 29B.

  In the low-temperature heat transfer plate 2B, between the seventh notch portion 28B and the eighth notch portion 29B provided to face each other in the X-axis direction in the figure, the seventh notch portion 28B and the eighth notch portion 8B are provided. A plurality of grooves 25B communicating with the notches 29B are formed. The plurality of grooves 25B are formed at the same position in the Y-axis direction as the plurality of grooves 25A formed in the high-temperature heat transfer plate 2A. In FIG. 4, the number of the grooves 25 </ b> B is three, but a number of grooves smaller than three or larger than three may be formed.

(Laminated structure of high temperature heat transfer plate 2A and low temperature heat transfer plate 2B)
As shown in FIG. 5 and FIG. 6, the high temperature heat transfer plate 2A and the low temperature heat transfer plate 2B having the above-described configuration have the same orientation of the surfaces provided with the grooves 25A, 25B, 30A, 31A. Then, the plurality of high temperature heat transfer plates 2A and the low temperature heat transfer plates 2B are alternately stacked and stacked. In this way, the heat exchanger body 2 is formed.

  In the heat exchanger main body 2, the first cutout portion 26A of the high temperature heat transfer plate 2A and the fifth cutout portion 26B of the low temperature heat transfer plate 2B include the high temperature heat transfer plate 2A and the low temperature heat transfer plate 2B. A plurality of layers are alternately stacked to form the high temperature fluid inlet 21.

  The second cutout portion 27A of the high temperature heat transfer plate 2A and the sixth cutout portion 27B of the low temperature heat transfer plate 2B are formed by alternately stacking a plurality of high temperature heat transfer plates 2A and low temperature heat transfer plates 2B. Forming a hot fluid outlet 22.

  The third cutout portion 28A of the high temperature heat transfer plate 2A and the seventh cutout portion 28B of the low temperature heat transfer plate 2B are formed by alternately stacking a plurality of high temperature heat transfer plates 2A and low temperature heat transfer plates 2B. Forming a cold fluid inlet 23.

  The fourth cutout portion 29A of the high temperature heat transfer plate 2A and the eighth cutout portion 29B of the low temperature heat transfer plate 2B are formed by alternately laminating a plurality of high temperature heat transfer plates 2A and low temperature heat transfer plates 2B. Forming a cryogenic fluid outlet 24;

(About high temperature flow path and low temperature flow path)
FIG. 5 is a perspective view showing a high-temperature channel in the heat exchanger body 2.
The high temperature flow path is formed between the grooves 25A, 30A, 31A of the high temperature heat transfer plate 2A and the lower surface of the low temperature heat transfer plate 2B. The hot fluid flows from the hot fluid inlet 21 and is distributed to the plurality of grooves 25A through the grooves 30A. The high temperature fluid that has passed through the plurality of grooves 25 </ b> A merges in the groove 31 </ b> A and flows out from the high temperature fluid outlet 22. Such a flow of the high-temperature fluid is generated in the high-temperature channel layer corresponding to each high-temperature heat transfer plate 2A.

FIG. 6 is a perspective view showing a low-temperature flow path in the heat exchanger body 2.
The low temperature flow path is formed between the groove 25B of the low temperature heat transfer plate 2B and the lower surface of the high temperature heat transfer plate 2A or the lower surface of the upper protection plate 4. The cryogenic fluid flows in from the cryogenic fluid inlet 23 and flows out of the cryogenic fluid outlet 24 through the plurality of grooves 25B. Such a low-temperature fluid flow is generated in the low-temperature flow path layer corresponding to each low-temperature heat transfer plate 2B.

Since the high-temperature channel layer and the low-temperature channel layer are alternately stacked in the heat exchanger main body 2, heat exchange is performed between the high-temperature fluid and the low-temperature fluid.
The high temperature fluid flowing through the groove 25A of the high temperature heat transfer plate 2A and the low temperature fluid flowing through the groove 25B of the low temperature heat transfer plate 2B are opposed to each other.
The high-temperature fluid flowing through the groove 25A of the high-temperature heat transfer plate 2A and the low-temperature fluid flowing through the groove 25B of the low-temperature heat transfer plate 2B are not limited to the counter flow, and may be a parallel flow or a cross flow.

[Temperature sensor mounting structure for detecting fluid temperature]
In the microchannel heat exchanger 1 of this embodiment, the temperature of the high temperature fluid and the low temperature fluid in the heat exchanger body 2 is measured by a temperature sensor inserted in the heat exchanger body 2.

  As shown in FIGS. 1 and 2, the micro-channel heat exchanger 1 includes a flanged sheath tube 4 </ b> A that houses a first temperature sensor that measures the temperature of the hot fluid near the hot fluid inlet 21, and the hot fluid. A flanged sheath tube 4B that houses a second temperature sensor that measures the temperature of the hot fluid near the outlet 22, and a flanged sheath tube that houses a third temperature sensor that measures the temperature of the cold fluid near the cold fluid inlet 23 4C and a flanged sheath tube 4D that houses a fourth temperature sensor that measures the temperature of the cryogenic fluid near the cryogenic fluid outlet 24 are disposed.

FIG. 7 is a sectional view showing the configuration of the flanged sheath tube 4A, and the other flanged sheath tubes 4B, 4C, and 4D have the same configuration.
FIG. 8 is a cross-sectional view showing a mounting structure of the flanged sheath tube 4A. This figure is a cross-sectional view taken along the line AA of FIG. The attachment structure of the other flanged sheath tubes 4B, 4C, and 4D is the same.

  As shown in FIG. 7, the flanged sheath tube 4A is joined to the sheath tube 101, which is a metal protective tube having one end closed and the other end open, and the outer peripheral surface on the other end side of the sheath tube 101 by welding or the like. And a metal flange 103 formed. As a material for the sheath tube 101 and the flange 103, for example, stainless steel is used. The flange 103 is a plate-like member having a uniform thickness. In the present embodiment, the sheath tube 101 and the flange 103 are formed separately, but the present invention is not limited to this, and the sheath tube 101 and the flange 103 may be formed integrally.

  In this flanged sheath tube 4A, the sheath tube 101 is inserted from one end side into a later-described through hole 121 provided in the upper protective plate 3B obtained by laminating a plurality of metal plates 127 and 133, and the lower surface 134 of the flange 103. Is disposed on a flange receiving surface 123 described later of the upper protection plate 3B. After all the parts such as the high temperature heat transfer plate 2A and the low temperature heat transfer plate 2B are laminated, the flanged sheath tube 4A is joined to the upper protection plate 3B by diffusion joining.

Here, the through hole 121 and the flange receiving surface 123 of the upper protection plate 3B will be described.
The upper protection plate 3B forms a plurality of first metal plates 127 provided with a first hole portion 125 that forms the through-hole 121, and a flange accommodating portion 129 that can accommodate the flange 103 of the flanged sheath tube 4A. And a second metal plate 133 provided with a second hole 131 for stacking. FIG. 8 shows a case where the upper protective plate 3B is configured by a laminate of five first metal plates 127 and one second metal plate 133. However, the first metal plate One or more of 127 and the second metal plate 133 may be used.

  In the upper protection plate 3B, each first metal plate 127 is laminated on the surface (upper surface) in the stacking direction of the heat exchanger main body 2 (flow path layer stack) in the heat exchanger main body 2 (flow path layer stack). The second metal plate 133 is laminated on the upper surface of the laminated first metal plate 127, that is, the surface farthest from the heat exchanger main body 2 (flow channel layer laminate). The Therefore, the through-hole 121 is formed by the 1st hole part 125 of the some 1st metal plate 127 continuing in the lamination direction of the heat exchanger main body 2 (flow-path layer laminated body). In addition, the second metal plate 133 is stacked on the stacked body of the plurality of first metal plates 127, so that the second hole 131 of the second metal plate 133 is a flow path layer of the through hole 121. A flange housing portion 129 that is recessed in the stacking direction of the upper protection plate 3B is formed around the opposite side of the laminate, and the upper surface of the first metal plate 127 directly below the second metal plate 133 is the flange housing portion 129. It is formed as a flange receiving surface 123 inside.

  The flanged sheath tube 4A is inserted into the through hole 121 of the upper protection plate 3B above the sheath tube 101, and the flange 103 is accommodated in the flange accommodating portion 129, and the heat exchanger body 2 and the lower protection plate 3A. Further, the lower surface 134 of the flange 103 is bonded to the flange receiving surface 123 by diffusion bonding the upper protective plate 3B and the like, and the flanged sheath tube 4A is integrated with the upper protective plate 3B.

  The flange 103 and the second metal plate 133 of the flanged sheath tube 4A are simultaneously placed on the first metal plate 127 when the heat exchanger body 2, the lower protection plate 3A, the upper protection plate 3B, and the like are diffusion bonded. Joined by diffusion bonding. The flanged sheath tube 4A and the second metal plate 133 are made equal in thickness so that the pressure applied to the joint surface when the flange 103 and the second metal plate 133 are heated and pressurized is uniform.

  The inner wall surface of the through-hole 121 and the outer peripheral surface of the sheath tube 101 of the flanged sheath tube 4A are preferably separated from each other. This is because if the inner wall surface of the through-hole 121 and the outer peripheral surface of the sheath tube 101 of the flanged sheath tube 4A are in contact, the temperature of the upper protection plate 3B affects the measurement temperature.

  FIG. 9 is a cross-sectional view showing a state in which a temperature sensor is sealed in a flanged sheath tube 4A attached to the upper protection plate 3B. The other end of the sheath tube 101 of the flanged sheath tube 4A is opened, and a temperature sensor 141 such as a thermistor is inserted into the sheath tube 101 from this opening. Taking the thermistor as an example, the thermistor chip is enclosed in glass. The glass ends are reinforced with ceramic tubes. Such a thermistor is disposed at the tip of the sheath tube 101, and a gap 142 is filled with a filler 142 such as an epoxy resin. The opening of the sheath tube 101 is sealed with a sealing material 145.

  Next, the assembly procedure of the microchannel heat exchanger of this embodiment will be described. First, a plurality of two types of heat transfer plates 2A and 2B are alternately stacked. A plurality of first metal plates 127 are stacked on the upper surface in the stacking direction of the stacked layers. By laminating the second metal plate 133 having the flange accommodating portion 129 on the first metal plate 127, the upper protection plate 3B is laminated. At this time, the through hole 121 and the flange accommodating portion 129 in the upper protection plate 3B are formed to be continuous. In addition, a plurality of lower protective plates 3A are similarly laminated on the lower surface in the laminating direction with respect to a laminate in which a plurality of heat transfer plates 2A and 2B are alternately laminated. Next, the flanged sheath portion 4A is inserted into the through hole 121 in the upper protection plate 3B from one end side of the sheath tube 101 and disposed on the upper surface of the flange receiving surface 123 on the lower surface 134 of the flange 103. A flange 103 is disposed at 129. A laminated body in which all parts are laminated is formed by the above arrangement process. After the formation of the laminated body is completed, the microchannel heat exchanger 1 is formed by diffusion bonding by heating and pressurizing in vacuum or in an inert gas.

According to the microchannel heat exchanger 1 of the embodiment described above, the flange 103 of the flanged sheath tube 4A enclosing the temperature sensor 141 is attached by diffusion bonding to the sheath tube upper protection plate 3B by welding or the like. This eliminates the need for mounting work and reduces the number of manufacturing steps.
Further, since the lower surface 134 of the flange 103 of the sheath tube 4A with flange is integrally joined to the flange receiving surface 123 of the first metal plate 127 of the upper protection plate 3B by diffusion bonding, the joint portion becomes a seal, The fluid in the heat exchanger main body 2 leaks through a gap between the inner wall surface of the through-hole 121 opened in the upper protective plate 3B and the outer peripheral surface of the sheath tube 101 in order to pass the sheath tube 101 of the flanged sheath tube 4A. Can be prevented. Therefore, a process for sealing the gap is unnecessary, and the number of manufacturing steps can be reduced.

  The diffusion bonding of the flange 103 and the flange receiving surface 123 of the flanged sheath tube 4A is performed by connecting the plurality of heat transfer plates 2A and 2B and the upper protection plate 3B that constitute the flow path layer laminate of the heat exchanger body 2. Simultaneously with the diffusion bonding of the plurality of metal plates 127 and 133 and the plurality of lower protection plates 3A.

<Modification 1>
Hereinafter, modified examples of the micro-channel heat exchanger 1 and the manufacturing method thereof according to the above embodiment will be described.
FIG. 10 is a sectional view showing a modification of the flanged sheath tube 4A.
In the flanged sheath tube 4A of the above embodiment, the other end side, which is the opening side of the sheath tube 101, is protruded from the other end surface of the flange 103. However, as shown in FIG. The height of the other end side may be aligned with the height of the other end surface of the flange 103. This eliminates the need to provide a space for avoiding the protruding portion of the sheath tube 101 on the pressure surface used for diffusion bonding.

<Modification 2>
In the flanged sheath tube 4A of the above embodiment, the second metal plate 133 provided with the second hole 131 for forming the flange housing portion 129 capable of housing the flange 103 of the flanged sheath tube 4A is provided. The plurality of first metal plates 127 are stacked on the plurality of first metal plates 127. For example, as shown in FIG. 11, the second metal plate 133 is the second metal layer from the top. The second metal plate 133 may be laminated at a position in contact with the upper surface of any one of the first metal plates 127.

<Modification 3>
As shown in FIG. 12, the thickness of the flange 103 of the flanged sheath tube 4 </ b> A may be equal to the thickness when a plurality of second metal plates 133 are stacked. Of course, in this case, a plurality of second metal plates 133 provided with the second hole 131 are continuously laminated. Also in this case, the plurality of second metal plates 133 provided with the second hole 131 for forming the flange accommodating portion 129 is the first metal of any one of the plurality of first metal plates 127. It may be laminated at a position in contact with the upper surface of the plate 127.

<Modification 4>
As shown in FIG. 14, there is a case where it is desired to make the fluid flow direction coincide with the major axis direction of the ellipse of the cross section of the sheath tube 101.

  Therefore, as shown in FIG. 13, the flange receiving surface 123 of the first metal plate 127 is provided with pin holes 147 at two positions sandwiching the first hole 125, and the flange 103 is also arranged in the stacking direction. Two penetrating pin holes 148 are provided. Before diffusion bonding, the pin 149 is inserted into the pin holes 147 and 148 facing each other, so that the first metal plate 127 and the flange 103 are connected to each other at an accurate position by the pin 149. As a result, the position of the flanged sheath tube 4A on the layer surface and the mounting direction in the direction around the axis are determined, so that the direction in the direction around the axis of the sheath tube 101 can be prevented from deviating from the required direction.

The flanged sheath tube 4A in which the mounting direction in the direction around the axis is determined is, for example, as follows.
FIG. 14 is a top view and a side sectional view showing an example of the flanged sheath tube 4A in which the mounting direction in the direction around the axis is determined.

  Here, the flow of the fluid in the flow path in which the sheath tube 101 of the flanged sheath tube 4A is arranged is in the direction from the left to the right in the figure. The sheath tube 101 has a long streamlined cross-sectional shape along the direction of fluid flow in the flow path. Thereby, it can reduce that the sheath pipe | tube 101 becomes resistance with respect to the flow of a fluid.

  In FIG. 14, the sheath tube 101 only needs to have a streamlined outer cross-sectional shape. Therefore, the shape of the space in the sheath tube 101 may be circular.

<Modification 5>
As shown in FIG. 15, when the thickness of the flange 103 of the flanged sheath tube 4A is smaller than the thickness of the second metal plate 133, the press P is not in contact with the flange 103 when diffusion bonding is performed. The pressure cannot be applied to the flange 103 and the flange 103 cannot be integrated with the first metal plate 127. On the contrary, when the thickness of the flange 103 is larger than the thickness of the second metal plate 133, the press P is not in contact with the second metal plate 133 when the diffusion bonding is performed. The second metal plate 133 cannot be integrated without being added to the plate 133.

  Therefore, as shown in FIG. 16, a method of performing diffusion bonding by interposing a metal spacer 151 such as a metal gasket between the lower surface 134 of the flange 103 and the flange receiving surface 123 of the first metal plate 127 is conceivable. . When the metal spacer 151 receives the pressure of the press P through the flange 103, the metal spacer 151 is compressed to a thickness that compensates for the shortage of the thickness of the flange 103 with respect to the thickness of the second metal plate 133. And the height of the second metal plate 133 can be made uniform, and a pressure necessary for diffusion bonding can be applied to the flange 103. Thereby, even the flange 103 thinner than the thickness of the second metal plate 133 can be surely integrated with the heat exchanger body by diffusion bonding.

<Modification 6>
In the above embodiment, the flanged sheath tube 4A in which the flange 103 is welded to the outer peripheral surface of the metal sheath tube 101 is used. However, for example, a flanged sheath tube integrally formed by flare processing or basil processing is used. May be.

DESCRIPTION OF SYMBOLS 1 ... Microchannel heat exchanger 2 ... Heat exchanger main body 3B ... Upper side protection plate 3A ... Lower side protection plate 4A, 4B, 4C, 4D ... Sheath tube with a flange 21 ... High temperature fluid inlet 22 ... High temperature fluid outlet 23 ... Low temperature Fluid inlet 24 ... Cryogenic fluid outlet 101 ... Sheath tube 103 ... Flange 121 ... First hole 127 ... First metal plate 129 ... Flange housing portion 131 ... Second hole 133 ... Second metal plate 141 ... Temperature Sensor 143 ... Insulator 151 ... Metal spacer

Claims (3)

A flow path layer laminate in which a plurality of first heat transfer plates provided with high-temperature fluid flow paths and a plurality of second heat transfer plates provided with low-temperature fluid flow paths are alternately stacked;
A protective plate joined to at least one surface in the stacking direction of the flow path layer stack;
A sheath tube having a flange and enclosing a temperature sensor;
The protective plate has a through-hole penetrating in the stacking direction of the protective plate, and a flange accommodating portion recessed in the stacking direction of the protective plate around the through-hole,
The sheath tube penetrates the through hole;
The flange is accommodated in the flange accommodating portion,
The microchannel heat exchanger, wherein the channel stack, the protection plate, and the flange are integrally joined. A plurality of first heat transfer plates provided with a flow path for high-temperature fluid and a plurality of second heat transfer plates provided with a flow path for low-temperature fluid are alternately stacked and stacked, and at least one of the stacking directions Disposing at least one first metal plate having a hole for forming a through-hole penetrating in the laminating direction on the surface;
Disposing a second metal plate having a flange accommodating portion on the first metal plate;
On the first metal plate, in a state where the sheath tube portion on the other side of the flange of the metal flanged sheath tube having one end closed is inserted into the through hole, the flange is used as a flange accommodating portion. Placing step;
And a step of integrating at least the first metal plate, the flange of the flanged sheath tube, and the second metal plate by diffusion bonding. It is a manufacturing method of the micro channel heat exchanger according to claim 2,
When accommodating the flange thinner than the second metal plate in the flange accommodating portion of the second metal plate,
Before the step of placing the flange,
A method of manufacturing a micro-channel heat exchanger, comprising: placing a metal spacer having a difference between a thickness of the second metal plate and a thickness of the flange on the first metal plate.

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