JP2011033314A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a heat exchanger using a coolant as a heat source, which is satisfactory in assembly workability and productivity and considerably reduces the manufacturing cost, by performing reduction in weight, downsizing, thinning, and densification of the heat exchanger. <P>SOLUTION: A large number of thin holes 11 each of which penetrates from one side end to the other side end are arranged in parallel into a flat-plate shape. These holes are bent in corrugate shapes to form an aluminum porous plate 10. A coolant passage is formed from one side end to the other side end of the aluminum porous plate 10, and water flow pipes 20 are formed in a manner of meandering in serpentine shapes. Straight tubes of the water flow pipes 20 are fitted between the wall surfaces 10a of the aluminum porous plate 10 from the sides. Tube walls 20a are made to contact the both side wall surfaces 10a so that water can circulate from one ends to the other ends of the water flow pipes 20 while crossing the flow of the coolant. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger using a refrigerant as a heat source, such as a heat exchanger of a heat pump type hot water heater.

  A heat pump type hot water heater using a high-temperature and high-pressure CO2 refrigerant as a heat source heats water by exchanging heat between the refrigerant and water, and has become popular in recent years. The heat exchanger incorporated therein is required to have a pressure resistance that can withstand the use of a high-pressure refrigerant. Conventionally, as this type of heat exchanger, as shown in Patent Document 1, a refrigerant is obtained by a capillary tube (a copper tube having a diameter of several millimeters). There is one in which a passage is formed, and as shown in Patent Document 2, there is also one in which a refrigerant passage is formed by an aluminum perforated plate formed by extrusion or drawing of an aluminum material. These heat exchangers have a small-diameter refrigerant passage to ensure pressure resistance and promote efficient condensation, and the water passage that is the fluid to be heated is a thin type housing inner fins and the like. It is a structure formed by a box, and a capillary tube or an aluminum porous plate is joined thereto.

JP 2003-31497 A JP 2002-31489 A

  Such conventional heat exchangers are composed of a large number of members, require assembly steps, have many joints, and are prone to defects, are unstable in quality, and are inferior in productivity. It was expensive. In addition, with the increase in heat exchange capability, the heat exchanger is also increased in size and weight, making it difficult to reduce the size.

  The present invention aims to solve these problems, and is aimed at reducing the weight, size, thickness, and density of heat exchangers that use refrigerant as a heat source, and is excellent in assembly workability and productivity. Proposes a heat exchanger that can greatly reduce manufacturing costs, and proposes a heat exchanger with a new configuration that meets the demands of cost reduction and mass production support as the heat pump water heater market expands It is.

  In order to achieve such an object, the present invention is a heat exchanger for exchanging heat between a refrigerant, which is a heat source, and water, and includes a plurality of pores 11 penetrating from one side end to the other side end. Then, the aluminum porous plate 10 formed into a flat plate shape and bent into a corrugated shape is formed, and a refrigerant passage extending from one side end of the aluminum porous plate 10 to the other side end is formed. Then, the water pipe 20 meandering in a serpentine shape is formed, the straight pipe portion is fitted between the wall surfaces 10a of the aluminum porous plate 10 from the side, the tube wall 20a is brought into contact with both side wall surfaces 10a, and the refrigerant flow This is characterized in that water is circulated from one end of the water pipe 20 to the other end.

  Further, the water pipe 20 is formed flat, and the flat pipe wall 20a is brought into contact with both side wall surfaces 10a.

  In addition, the water pipes 20 are individually inserted from the left and right sides of the aluminum porous plate 10, and a plurality of water pipes 20 are arranged in close contact.

  In the heat exchanger of the present invention, the refrigerant passage is formed by the aluminum perforated plate 10 bent into a corrugated shape, so that the effective length of the refrigerant passage is shortened and the external dimensions are shortened. Since the water pipe 20 is formed in a serpentine shape, the effective length of the water passage is lengthened and the external dimensions are shortened, and the water pipe 20 is small and extremely thin. Further, the straight pipe portion is fitted between the wall surfaces 10a of the aluminum porous plate 10, the tube wall 20a contacts both side wall surfaces 10a of the aluminum porous plate 10, and heat exchange is performed through this contact surface, so that the heat efficiency is extremely high. It is excellent.

  The porous aluminum plate 10 is much lighter and cheaper than a capillary tube of the same capacity, and the main porous aluminum plate 10 and the water pipe 20 are bent into a predetermined shape, and the water pipe 20 is made of porous aluminum. It is easily assembled by being fitted between the side walls 10a from the side of the plate 10, is extremely excellent in productivity, and can greatly reduce the manufacturing cost as compared with the conventional product.

  Moreover, the heat transfer area can be increased by forming the water flow pipe 20 flat and bringing the flat pipe wall 20a into contact with both side wall surfaces 10a. Moreover, if it is set as the structure which inserts the water pipe 20 separately from the right and left sides of the aluminum porous board 10, the water pipe 20 will be arrange | positioned in the alternating relationship between the wall surfaces 10a of the aluminum porous board 10, and it will be by parallelization of a water path. Along with the reduction in pressure loss, the heat exchanger is densified and can be applied to increase the heat exchange capability. Furthermore, the density of the heat exchanger can be further increased by closely juxtaposing the plurality of water pipes 20.

The perspective view of the Example of this invention. The disassembled perspective view which shows the assembly method. Sectional drawing of the AA line in FIG. Sectional drawing of the BB line in FIG. Sectional drawing of the principal part of another Example. Furthermore, sectional drawing of the principal part of another Example.

  Hereinafter, specific embodiments of the present invention will be described based on examples of the drawings.

  The illustrated heat exchanger is an application example of the heat exchanger of the present invention incorporated in a heat pump type hot water heater, and FIGS. 1 to 4 are the first embodiment. In the figure, an aluminum material is formed by extruding or drawing an aluminum material, arranging a large number of pores 11 penetrating from one side end to the other side end, forming a flat plate, and bending it into a corrugated shape. A plate 10 is formed. A refrigerant inlet header 13 is provided at one side end of the porous aluminum plate 10, and an outlet header 14 is provided at the other side end. The refrigerant flowing from the inlet header 13 divides a large number of pores 11 and reaches the outlet header 14. A refrigerant passage is formed.

  A water pipe 20 made of copper material or SUS material, bent into a serpentine shape and meandered at a predetermined pitch is formed. The water pipe 20 is a flat pipe, and the two water pipes 20 have their straight pipe portions fitted between the wall surfaces 10a of the aluminum porous plate 10, and the flat pipe walls 20a are in contact with both side wall surfaces 10a. A water inlet header 23 is provided at one end of the water pipe 20, and an outlet header 24 is provided at the other side end so as to communicate with the pipe ends of both water pipes 20. Water flowing in from the inlet header 23 divides both water pipes 20. A water passage leading to the outlet header 24 is formed, and the water flows through intersecting with the flow of the refrigerant, and heat is exchanged through the contact surface to be heated.

  FIG. 2 shows a method for assembling this heat exchanger. The pitch interval X of the straight pipe portion of the water pipe 20 is set so as to match the wavelength interval Y of the aluminum porous plate 10, and as shown in the figure, each water pipe 20 is connected to the aluminum porous plate 10. The wall surface 10a is individually fitted from the left and right sides and assembled. Two water pipes 20 are arranged in an alternating relationship between the wall surfaces 10 a of the aluminum porous plate 10, and the pipe wall 20 a of the straight pipe portion of each water pipe 20 is in contact with both side wall surfaces 10 a. , 14, 23, 24 are joined by brazing or soldering.

  FIG. 5 shows another embodiment of the heat exchanger of the present invention. As shown in the figure, in this heat exchanger, the water pipe 20 is formed to have a rectangular cross section, and the pipe wall 20a on the short side of the straight pipe portion is in contact with both side wall surfaces 10a of the aluminum porous plate 10. It is inserted between the wall surfaces 10a. Compared to the heat exchanger of the previous example, the thickness is further reduced.

  FIG. 6 shows still another embodiment of the heat exchanger of the present invention. As shown in the figure, this heat exchanger uses a normal circular pipe as the water pipe 20, and from the left and right sides of the aluminum porous plate 10, two water pipes 20 are fitted on each side and closely juxtaposed. It is a thing. Compared to the heat exchanger of the previous example, the density of the heat exchanger is further increased.

DESCRIPTION OF SYMBOLS 10 Aluminum perforated plate 10a Wall surface 11 Pore 20 Water pipe 20a Pipe wall

Claims (4)

A heat exchanger for exchanging heat between a refrigerant as a heat source and water,
A number of pores 11 penetrating from one side end to the other side end are arranged in rows and formed into a flat plate shape, and an aluminum porous plate 10 is formed by bending it into a corrugated shape. Forming a refrigerant passage from one side end to the other side end,
A water pipe 20 meandering in a serpentine shape is formed, and the straight pipe part is fitted between the wall surfaces 10a of the aluminum porous plate 10 from the side, and the pipe wall 20a is brought into contact with both side wall surfaces 10a to intersect the refrigerant flow. The heat exchanger is configured such that water flows from one end of the water flow pipe 20 to the other end.   The heat exchanger according to claim 1, wherein the water flow pipe 20 is formed flat and the flat pipe wall 20a is brought into contact with both side wall surfaces 10a.   The heat exchanger according to claim 1 or 2, wherein the water pipes 20 are individually inserted from the left and right sides of the aluminum porous plate 10.   The heat exchanger according to claim 3, wherein a plurality of water pipes 20 are arranged in close contact.

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