JP2021188844A - Heat exchanger - Google Patents

Abstract

To provide a heat exchanger improving connection strength of a header area part in a simple structure and having high reliability.SOLUTION: A heat exchanger is structured by laminating plate fins 3 each having a flow path where a first fluid such as a refrigerant flows. The plate fins 3 are each structured by brazing a pair of plates to form the flow path between them, providing cylinder parts 13 at proper places of a periphery of a header area X part linked with the flow path, and also fitting the cylinders to each other and brazing them to fixedly connect the header areas. As a result of such a structure, the connection strength of the header area parts is improved in a simple structure without using any reinforcing plates or bolts, and the rigidity of the plate fin laminated body is improved, so that the heat exchanger is made to be highly reliable.SELECTED DRAWING: Figure 3

Description

The present invention relates to a plate fin laminated heat exchanger.

Patent Document 1 shows a conventional plate fin laminated heat exchanger. As shown in FIGS. 7 and 8, this plate fin laminated heat exchanger includes a plate fin laminated body 102 in which plate fins 101 having a flow path through which a first fluid such as a refrigerant flows flows, and the plate fin laminated body 102. The plate fin laminated body 102 includes end plates 103 laminated and arranged on both sides of the body 102, and inflow / outflow pipes 104 and 105 through which the first fluid flowing through the flow path of the plate fin laminated body 102 flows in and out. A second fluid is flowed between the laminated plate fins of the above, and heat is exchanged between the first fluid and the second fluid. Then, a through hole 107 is provided at an appropriate position on the peripheral edge of the header region 106 which is the entrance / exit portion of the first fluid flow path of the plate fin laminated body 102, and the bolt 109 is passed through the through hole 107 through the reinforcing plate 108 to pass the header region portion. Is connected and fixed.

International Publication No. 2018/074342

The present disclosure provides a plate fin laminated heat exchanger that suppresses deformation due to insufficient strength of the connection and fixing while simplifying the connection and fixing configuration of the header region portion.

In the plate fin laminated heat exchanger of the present disclosure, a cylinder portion is provided in a through hole provided at an appropriate position on the peripheral edge of the header region portion, and the cylinder portions are fitted and brazed to connect and fix the header region. It has a structure.

The heat exchanger according to the present disclosure has a simple structure in which cylinders are joined to each other without using reinforcing plates or bolts to improve the connection strength of the header region portion and suppress deformation of the plate fin laminate for reliability. It can be a high heat exchanger.

A perspective view showing the appearance of the plate fin laminated heat exchanger according to the first embodiment. Enlarged perspective view showing the header area of the heat exchanger Enlarged sectional view showing the header area of the heat exchanger Enlarged sectional view of the main part of the header area of the heat exchanger Enlarged sectional view of part A in FIG. An exploded perspective view of the plate fins of the heat exchanger according to the first embodiment. Perspective view of conventional plate fin laminated heat exchanger Perspective view showing the state before the header region connection and fixing of the conventional plate fin laminated heat exchanger.

(Knowledge, etc. that became the basis of this disclosure)
At the time when the inventors came up with the present disclosure, the inventors have proposed the plate fin laminated heat exchanger described in Patent Document 1. In this heat exchanger, the header region 106 in which the first fluid such as the refrigerant flowing through the flow path collects is easily deformed by the pressure of the first fluid. Therefore, the reinforcing plate 108 is applied to the outer surface of the header region 106 and connected by the bolt 109. Although it is fixed, there is a problem that the configuration is complicated because the reinforcing plate 108 and the bolt 109 are required, the weight of the entire heat exchanger increases, and the work of assembling them is required, which reduces the productivity. there were.

In view of such problems, the inventors have come to construct the subject matter of the present disclosure in order to solve these problems.

Therefore, the present disclosure provides a highly reliable heat exchanger that suppresses deformation of the header region portion while simplifying the connection and fixing configuration of the header region portion.

Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters, or even in modified examples, the same reference numerals may be given to substantially the same configuration, and duplicate explanations may be omitted. This is to prevent the following explanation from becoming unnecessarily redundant and to facilitate the understanding of those skilled in the art.

The heat exchanger of the present invention is not limited to the configuration of the plate fin laminated heat exchanger described in the following embodiments, and is equivalent to the technical idea described in the following embodiments. It includes the composition of.

Further, the embodiments described below show an example of the present invention, and the configurations, functions, operations and the like shown in the embodiments are examples and do not limit the present disclosure.
(Embodiment 1)
Hereinafter, the first embodiment according to the heat exchanger of the present disclosure will be described with reference to FIGS. 1 to 6.

[1-1. composition]
FIG. 1 is a perspective view showing the appearance of the plate fin laminated heat exchanger (hereinafter, simply referred to as a heat exchanger) 1 of the first embodiment, and FIG. 2 is an enlarged view showing a header region of the plate fin laminated heat exchanger. A perspective view, FIG. 3 is an enlarged sectional view showing a header region of the plate fin laminated heat exchanger, FIG. 4 is an enlarged sectional view of a main part of the header region of the plate fin laminated heat exchanger, and FIG. 5 is FIG. An enlarged sectional view of part A, FIG. 6 is an exploded perspective view of the plate fins of the plate fin laminated heat exchanger according to the first embodiment.

As shown in FIGS. 1 to 6, the heat exchanger 1 of the present embodiment has an inflow pipe (inlet header) 2 into which a refrigerant as a first fluid flows, and a plurality of plate fins 3 having a rectangular plate shape. It has a plate fin laminated body 4 configured by laminating, and an outflow pipe (outlet header) 5 for discharging a refrigerant flowing through a flow path in the plate fin 3.

Further, on both sides (upper side and lower side in FIG. 1) of the plate fin laminated body 4 in the stacking direction, end plates 6a and 6b having substantially the same shape as the plate fin 3 in a plan view are provided. The end plates 6a and 6b are formed of a plate material having rigidity, and are formed by metal processing a metal material such as aluminum, an aluminum alloy, or stainless steel by grinding.

The end plates 6a and 6b and the plurality of plate fins 3 are brazed and joined in a laminated state to be integrated. These may be joined using other heat resistant fixing methods, such as chemical joining members.

Further, in the present embodiment, the plate fin laminated body 4 formed by laminating the plate fins 3 has a shape in which both ends in the longitudinal direction are connected and fixed, and the configuration thereof will be described later.

As shown in FIG. 6, the plate fin 3 is formed by brazing and joining a pair of long plates 3a and 3b having concave grooves serving as a flow path 7, and the connecting path 8 is formed by the joining. It is provided with an inflow header flow path 9 and an outflow header flow path 10 connected to the flow path 7 via the above. The flow paths 7 provided in the plates 3a and 3b are arranged along the longitudinal direction and made a U-turn at the end, and the inflow header flow path 9 connected to the outward flow path 7a and the outflow connected to the return flow path 7b are connected to one end side. The header flow paths 10 are collectively provided, and a slit 11 for suppressing heat transfer of the first fluid flowing through both flow paths is formed between the forward flow path 7a and the return flow path 7b. Then, as described above, the plate fins 3 are laminated together with the end plates 6a and 6b and brazed to form the plate fin laminated body 4, and the inflow header flow path 9 and the outflow header of the plate fin laminated body 4 are formed. The inflow pipe 2 and the outflow pipe 5 are connected to the flow path 10 to form a heat exchanger.

Next, the connection and fixing configuration of both ends of the plate fin laminate 4 will be described. The heat exchanger of the present embodiment is provided with a through hole 12 at the peripheral edge of the header region X where the inflow header flow path 9 and the outflow header flow path 10 of the plate fin 3 are located, and the through hole 12 is provided. The header region X is formed by vertically forming the cylinder portion 13, fitting the cylinder portion 13 with the cylinder portion 13 of another plate fin 3 adjacent in the stacking direction as shown in FIGS. 4 and 5, and brazing the cylinder portion 13. Is connected and fixed. The tubular portions 13 and 13 are formed so as to project on a surface opposite to the brazed surface of the brazing material previously coated and formed on the plates 3a and 3b, and the tubular portions 13 and 13 are fitted to each other. The header region X of the plate fin laminate 4 formed by laminating a plurality of plate fins 3 by melting and solidifying the brazed material on the brazed surface of one of the inner peripheral surfaces of the cylinders and integrating the cylinders 13 and 13 with each other. Is connected and fixed.

Further, although the end portion of each plate fin 3 on the side opposite to the header region X is not shown, the cylinder portion 13 is formed by providing the same through hole 12 as described above, and the cylinder portions 13 and 13 are fitted to each other. The ends of the plate fin laminated body 4 formed by laminating the plate fins 3 are connected and fixed by brazing them together.

As shown in FIG. 6, the tubular portion 13 erected in the through hole 12 is provided so as to surround the inflow header flow path 9 and the outflow header flow path 10. In this example, each of the tubular portions 13 is located on the substantially center lines of the inflow header flow path 9 and the outflow header flow path 10, specifically, on the substantially center lines of the outflow header flow path 10 and the outflow header flow path 10. It is provided so that the outer periphery of the cylinder portion falls into the category of overlapping. The fitting clearance between the two cylinder portions 13 and 13 is 0.2 mm or less, preferably 0.2 mm to 0.1 mm.

Further, the tubular portions 13 and 13 to be fitted are at least one of them, and in this example, the tubular portion 13 of the plate 3a on the upper side of the drawing is formed in a tapered shape with a tapered tip.

[1-2. motion]
The operation and operation of the heat exchanger 1 configured as described above will be described below.

In the heat exchanger of the present embodiment, for example, when it is incorporated in a refrigeration system and used under evaporation conditions, a gas-liquid two-phase state refrigerant which is the first fluid from the inflow pipe 2 is used for the inflow of the plate fin laminate 4. It flows into the header flow path 9. The refrigerant that has flowed into the inflow header flow path 9 flows to the outbound flow path 7a group via the connecting path 8 of each plate fin 3. The refrigerant flowing in the forward flow path 7a group of each plate fin 3 makes a U-turn and flows out from the outflow pipe 5 to the refrigerant circuit of the refrigeration system in a gas phase state through the return flow path 7b. Then, when flowing through the outbound flow path 7a, the refrigerant exchanges heat with the air (second fluid) that passes through the plate fin stacking interval of the plate fin laminated body 4.

At this time, since the heat transfer between the forward flow path 7a group and the return flow path 7b is suppressed by the slit 11, high heat exchange efficiency is exhibited. When the heat exchanger is used as a condenser, the flow of the first fluid is in the opposite direction, the inflow pipe 2 and the inflow header flow path 9 become the outflow pipe and the outflow header flow path, and the outflow pipe 5 The outflow header flow path 10 is an inflow pipe and an inflow header flow path.

Here, in the heat exchanger, since the opening area of the header flow path 9 is larger than that of the other flow paths, stress is concentrated on the header region X portion and the heat exchanger tends to be greatly deformed in the stacking direction. In the heat exchanger, the header region X portion is firmly connected and fixed, deformation is suppressed, and the heat exchanger can be used as a highly reliable heat exchanger.

More specifically, in the heat exchanger of the present embodiment, the cylinder portions 13 and 13 are provided in the header region X portion of each plate 3a and 3b forming the plate fin 3, respectively, and the cylinder portions 13 and 13 are fitted to each other. The header regions X of the adjacent plate fins 3 are connected and fixed by brazing.

As a result, the tubular portions 13 and 13 of the plate fins 3 are connected to each other in a columnar shape in the stacking direction in a fitted state, and the tubular portions 13 and 13 are joined by the brazing material and joined by the solidified brazing material. The added strength makes it more robust. Therefore, it is possible to greatly improve the connection strength of the header region portion and improve the rigidity of the plate fin laminate to obtain a highly reliable heat exchanger.

Further, the reinforcing plate, bolts, etc. for ensuring the connection strength of the header region portion are not required, and the configuration can be simplified as compared with the one using the reinforcing plate, bolts, or the like.

Moreover, workability can be improved and productivity can be increased. That is, the header region X can be connected and fixed simply by inserting the through hole 12 into the guide pin jig, laminating the plates 3a and 3b, putting them in the melting furnace as they are, and brazing them. Separately, the man-hours for assembling using the reinforcing plate and bolts can be reduced, and the workability is greatly improved. Therefore, productivity is greatly improved.

Further, in the heat exchanger of the present embodiment, the tubular portions 13 and 13 are provided so as to surround the inflow header flow path 9 and the outflow header flow path 10, respectively, so that many first fluids are concentrated. Even if a high pressure is applied around the inflow header flow path 9 and the outflow header flow path 10 of each plate 3a and 3b, that is, the header region X portion, the pressure resistance of the entire header region X portion is maintained in the inflow header flow path. It is possible to improve around 9 and around the outflow header flow path 10 substantially evenly. In this example, since each cylinder portion 13 is provided on the substantially center line of each of the outflow header flow path 10 and the outflow header flow path 10 so that at least the outer periphery of the cylinder portion 13 overlaps. , The vicinity of each of the outflow header flow path 10 and the outflow header flow path 10 on the substantially center line is connected by the tubular portion 13, and the pressure resistance of the header region X portion is more evenly and surely improved to prevent deformation. be able to.

Further, since at least one of the tubular portions 13 and 13 provided on the pair of plates 3a and 3b is tapered, the tubular portions 13 and 13 are fitted to each other even if there is a dimensional tolerance between the tubular portions 13 and 13. At least a part of them can be surely contacted and both can be surely fixed with a brazing material. Therefore, the connection strength of the header region X portion becomes strong, and the pressure resistance can be improved more reliably.

Further, since the fitting clearance between the two cylinders 13 and 13 is set to 0.2 mm or less, in this example, in the range of 0.2 mm to 0.1 mm, the fitting clearance between the cylinders 13 and 13 is set to be in the range of 0.2 mm to 0.1 mm. The brazing material melted all around the circumference wraps around almost uniformly and solidifies. Therefore, the strength of the joint portion between the cylinder portions 13 and 13 including the brazing material is surely improved, and the pressure resistance of the header region X portion can be further improved.

(Other embodiments)
As described above, the first embodiment has been described as an example of the technique disclosed in the present invention. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. have been made. It is also possible to combine the components described in the first embodiment to form a new embodiment.

Therefore, other embodiments will be exemplified below.

In the first embodiment, the inflow header flow path 9 connected to the outflow flow path 7a and the outflow header flow path 10 connected to the return flow path 7b are collectively provided by making a U-turn in the flow path through which the first fluid flows. Although the heat exchanger is exemplified, the flow path 7 is linear, and an inflow header flow path 9 is provided at one end of the plate fin 3 and an outflow header flow path 10 is provided at the other end, and the inflow header flow path 9 and the outflow are provided. The cylinder portions 13 and 13 may be provided so as to surround the header flow path 10, and may be connected and fixed.

Further, the tubular portions 13 and 13 provided on the pair of plates 3a and 3b constituting the plate fin 3 are tubular portions having a circular cross section, but this is any shape such as a polygonal cylinder such as a hexagonal cylinder or an elliptical cylinder. May be. Further, as shown in FIG. 6, a discontinuous tubular portion having a cut such as the tubular portion 13a provided in the middle of the slit 11 may be used.

Further, although at least one of the tubular portions 13 and 13 is tapered, it does not have to be tapered. Further, both the tubular portions 13 and 13 may be tapered, and in this case, it is preferable that the tapered angles of both are slightly different. Alternatively, although not shown, one of the tubular portions 13 and 13 may be nested.

[1-3. Effect, etc.]
As described above, the heat exchanger of the present disclosure includes a plate fin laminate in which plate fins having a flow path through which a first fluid such as a refrigerant flows is laminated, and end plates laminated on both sides of the plate fin laminate. And an inflow header flow path and an outflow header flow path through which the first fluid flowing through the flow path of the plate fin laminate is provided, and a second fluid is provided between the plate fin stacks of the plate fin laminate. Is a heat exchanger that exchanges heat between the first fluid and the second fluid by flowing a pair of plates, and the plate fins have a configuration in which a pair of plates are rolled to form a flow path between them. At the same time, a cylinder portion is provided at an appropriate position on the peripheral edge of the header region portion provided with the inflow header flow path and the outflow header flow path connected to the flow path, and the cylinder portions are fitted and rolled to connect the header areas. It has a fixed configuration.

As a result, the connection strength of the header region portion can be improved with a simple configuration without using a reinforcing plate or bolts, and the rigidity of the plate fin laminate can be improved to obtain a highly reliable heat exchanger.

Further, although the heat exchanger of the present disclosure has the above-mentioned configuration and effect, it is preferable that the cylinder portion is provided so as to surround the inflow header flow path and the outflow header flow path, whereby the header region portion is provided. The pressure resistance can be improved more reliably.

Further, in the heat exchanger of the present disclosure, in each of the heat exchangers, it is preferable that the cylinder portion has a shape in which at least one of the cylinder portions provided on the pair of plates is tapered or nested, whereby the cylinder portion is formed. The pressure resistance of the header region portion can be improved more reliably by ensuring the joining of the portions.

Further, in the heat exchanger of the present disclosure, it is preferable that the fitting clearance between the cylinders is 0.2 mm or less, whereby the pressure resistance of the header region portion ensures that the cylinders are joined to each other as described above. The improvement can be further ensured.

The plate fin laminated heat exchanger according to the present invention has been described above using the above-described embodiment, but the present invention is not limited thereto. That is, the embodiments disclosed this time are exemplary and not restrictive in all respects, and the scope of the present invention is indicated by the scope of claims and is equivalent to and within the scope of claims. All changes are included.

The heat exchanger of the present disclosure can be a highly reliable heat exchanger by improving the connection strength of the header region portion and improving the rigidity of the plate fin laminate with a simple configuration. Therefore, it can be widely used in heat exchangers and various refrigeration equipment used for home and commercial air conditioners, and has great industrial value.

1 Heat exchanger 2 Inflow pipe 3 Plate fin 3a, 3b Plate 4 Plate fin laminate 5 Outflow pipe 6a, 6b End plate 7 Flow path 7a Outward flow path 7b Return flow path 8 Connection path 9 Inflow header flow path 10 Outflow Header flow path 11 Slit 12 Through hole 13 Cylinder

Claims (4)

A plate fin laminate having plate fins having a flow path through which a first fluid such as a refrigerant flows, end plates laminated on both sides of the plate fin laminate, and the plate fin laminate flowing through the flow path of the plate fin laminate. An inflow header flow path and an outflow header flow path through which the first fluid passes are provided, and the second fluid is allowed to flow between the plate fin stacks of the plate fin laminates so that the first fluid and the second fluid flow. It is a heat exchanger that exchanges heat with
The plate fin has a structure in which a pair of plates are brazed to form a flow path between them, and the peripheral edge of a header region portion provided with an inflow header flow path and an outflow header flow path connected to the flow path. A heat exchanger in which cylinders are provided in appropriate places, and the cylinders are fitted and brazed to connect and fix the header area. The heat exchanger according to claim 1, wherein the cylinder portion is provided so as to surround the inflow header flow path and the outflow header flow path. The heat exchanger according to claim 1 or 2, wherein the tubular portion has a shape in which at least one of the tubular portions provided on the pair of plates has a tapered shape or a nesting process. The heat exchanger according to any one of claims 1 to 3, wherein the fitting clearance between the cylinders is 0.2 mm or less.

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