JPH04292795A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the number of components and the number of assembling steps when a plurality of paths are formed in a plate fin tube type heat exchanger, to reduce its cost satisfactorily for a mass production, to make a branch unit and a mixing unit accurate and the performance uniform, to provide high degree of freedom in the design and to realize a sufficient simplification. CONSTITUTION:In a plate fin pipe tube heat exchanger having a plurality of paths, a passage member 4 integrally formed with a plurality of branch passages 3 corresponding to the paths are provided, and the ends of heat transfer pipes 1 are coupled to the branch passages of the member 4 corresponding to the paths.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger applied to air conditioners and the like, and more particularly to improvements in plate-fin-pipe heat exchangers.

0003

2. Description of the Related Art Generally, a plate-fin tube type heat exchanger is used in air conditioners and the like. In recent years, there has been a demand for a more compact plate-fin-pipe heat exchanger, and to this end, efforts are being made to reduce the diameter of heat transfer pipes, optimally reduce the pipe pitch, and the like.

By the way, when reducing the diameter of a heat transfer pipe,
Since the pressure loss on the refrigerant side increases, it becomes necessary to increase the number of passes. For example, in a small air conditioner, 6.35
When using a heat transfer pipe with a diameter of mm or more, two passes or less are sufficient, but when using a heat transfer pipe with a diameter of 6 mm or less, three passes or more are required.

[0005] A plate-fin-tube heat exchanger basically has one pass, and in order to have multiple passes, parts for dividing flow are required. Conventionally, heat transfer pipes are connected using various combinations of headers, manifolds, branch joints such as Y joints and three-way Y joints, return bends, and the like.

[0006] These diversion parts are usually made by processing copper pipes and are made into individual independent parts. Therefore, in the past, the number of parts and assembly man-hours such as brazing increased, making it unsuitable for mass production and increasing costs, and at the same time, variations in accuracy of the branching section and merging section, and eventually variations in performance. In addition, there are many design restrictions depending on the type of connecting parts, and even the manufactured ones are
The connecting parts are complicated and large, and it is not necessarily possible to achieve sufficient compactness.

[0007]

[Problems to be Solved by the Invention] Conventionally, when the number of passes increases due to the reduction in the diameter of heat transfer pipes, many parts for diversion are required, which increases the number of parts and assembly man-hours, resulting in high cost and performance. There were various problems such as variations in the number of connections, complicated connections, and large size.

The present invention was made in view of the above circumstances, and its purpose is to reduce the number of parts and assembly man-hours when using a plate fin tube type with multiple passes, making it suitable for mass production and reducing costs. It is an object of the present invention to provide a heat exchanger that can be made more compact, have uniformity in accuracy of flow dividing sections and merging sections, and even performance, can have a large degree of freedom in design, and can be made sufficiently compact. [Structure of the invention]

[0009]

[Means for Solving the Problems] The present invention is a plate-fin-pipe type heat exchanger having a plurality of passes, which includes an integrated flow passage member in which a plurality of branch flow passages corresponding to the number of passes are formed. The pipe end of the heat transfer pipe is connected to each branch flow path of the flow path member in correspondence with each pass.

0010

[Operation] According to the configuration of the present invention, since a plurality of paths are constructed using an integrated unitary flow path member in which a plurality of flow paths are formed, a plurality of flow path members are formed. Unlike conventional configurations using , the number of parts is reduced and the number of assembly steps such as pipe connections is also reduced. Furthermore, since batch processing is possible, it is suitable for mass production, and costs can be reduced accordingly. Furthermore, since the accuracy of the branching portion and the merging portion is made uniform, performance can be made uniform and the degree of freedom in design increases. Furthermore, since there is only a single component for diverting flow, and the configuration thereof can be made compact, sufficient compactness can be realized.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partial cross-sectional view of the plate-fin-pipe heat exchanger of this embodiment, and FIGS. 2 and 3 are views taken along arrows A, B, and C in FIG. 1, respectively.

As shown in the figure, the heat exchanger of this embodiment is of a U-shaped tube type, and a plurality of U-shaped heat transfer pipes 1 are arranged vertically in two rows. A plate fin 2 is assembled.

In this embodiment, the refrigerant flow path has a four-pass configuration, and the head of each heat transfer pipe 1 is provided with an integrated flow path member 4 in which branch flow paths 3 corresponding to the number of passes are formed. It is being The flow path member 4 is made of a light alloy such as aluminum or an iron-based alloy and has a flat box shape, and is composed of a flow path member main body 5 with a flow path opening, and a lid body 6 having a refrigerant inlet and outlet. There is. The pipe ends of the heat transfer pipes 1 are connected to each branch flow path 3 of the flow path member 4 in correspondence to each pass. In addition, there is a mounting plate 7 on the rear side.
is provided.

The refrigerant flow path will be explained below with reference to the arrows in the figure.

That is, the refrigerant first flows into the flow path 3 from the refrigerant inlet a0 of the flow path member 4, and then flows through the heat transfer pipes a1, b1, c.
1, d1.

The divided refrigerants are a2, b2, c, respectively.
2, d2, and then a3 to a8, b3 to b8, c3 to
It is subjected to heat exchange through channels c8 and d3 to d8.

[0018] The refrigerant subjected to heat exchange is finally
They flow out from refrigerant outlets a9, b9, c9, and d9, respectively.

Here, the method for manufacturing the heat exchanger of the embodiment is carried out in the following steps.

Step 1: The flow path member main body 5 having flow path holes is placed on the stacked plate fins 2. Step 2: Insert the U-shaped heat transfer pipe 1 into the plate fin 2 from the opposite side of the channel member main body 5, and make it penetrate to the channel member main body 5. At this time, a certain distance is left between the flow path member main body 5 and the adjacent plate fan 2. Step 3 The U-shaped heat transfer pipe 1 is expanded, and the U-shaped heat transfer pipe 1, the flow path member main body 5, and the plate fins 2 are fixed. Step 4 The flow path member 4 is completed by brazing the lid 6 to the flow path member main body 5 in a furnace. In the embodiment, the channel member 4 is formed by casting such as die casting, sintering, or other various manufacturing methods.

For example, as a casting method, a lost wax method, a shell mold method, a full mold method, a vacuum suction method, a centrifugal casting method, etc. can be applied. As the plastic working, bulge working, die forging, explosive forming, etc. can be applied. As the sintering method, HIP method, CIP method, and general sintering can be applied. As other methods, a slurry hardening method, an electrolytic plating method, etc. can be applied.

The heat transfer pipe 1 and the flow path member 4 may be connected not only by pipe expansion but also by bonding, furnace brazing, or the like.

[0023] According to the above embodiment, a plurality of paths are constructed using the unitary channel member 4 in which a plurality of diversion channels are formed. The number of parts can be reduced compared to the conventional configuration used.

[0024] Furthermore, the number of assembly steps such as pipe connections can be reduced, and since batch processing is possible, it is suitable for mass production, and costs can be reduced accordingly.

[0025] Moreover, since the accuracy of the branching part and the merging part is made uniform, performance can be made uniform and the degree of freedom in design is increased.

Furthermore, since the diversion component is single and its configuration can be made compact, it is possible to achieve sufficient compactness compared to the conventional configuration that uses multiple diversion components, and the head The protruding dimension of the part can also be made smaller than that of the conventional retanbend method, making it possible to effectively save space.

In the above embodiment, the number of refrigerant passes is four, but the present invention is not limited to this and can be implemented with various numbers of passes. In particular, refrigerant pipe 1 is 6m long.
It is effective when the diameter is less than m and the number of refrigerant passes is 3 or more.

[0028]

As described above, according to the present invention, since a plurality of paths are configured using an integral unit flow path member in which a plurality of branch flow paths are formed, the number of parts can be reduced. In addition to reducing the number of assembly steps such as pipe connections, it is also possible to perform batch processing, making it suitable for mass production, which reduces costs and evens out the precision of the branching and merging sections. This makes it possible to achieve uniform performance and increase the degree of freedom in design.Furthermore, since there is only a single diverting component, the configuration can be made smaller.
Many effects such as sufficient compactness can be achieved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along arrow A in FIG. 1;

FIG. 3 is a view taken along arrow B in FIG.

FIG. 4 is a view taken in the direction of arrow C in FIG. 1.

[Explanation of symbols]

1 Heat transfer pipe 2 Plate fin 3 Diversion channel 4 Flow path member

Claims (1)

[Claims] 1. A plate-fin-pipe heat exchanger having a plurality of passes, comprising an integrated flow path member in which a plurality of branch flow paths corresponding to the number of passes are formed, each of the flow path members A heat exchanger characterized in that the tube ends of heat transfer pipes are connected to the diversion channels in correspondence with each pass.