JP2009074772A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assembling workability and productivity, and to miniaturize a heat exchanger, in the heat exchanger for heating water flowing in a thin rectangular housing 10 formed by joining peripheral edges of two sheets of plates 11, 12, by circulating a refrigerant in a tube 40 joined to the flat face of the housing 10. <P>SOLUTION: A corrugated plate 20 has notches 22a formed at side ends of wall faces 22 alternately in right and left directions, and received in the housing 10 in a state of bringing upper and lower folded faces 24, 25 into contact with the plates 11, 12 to form a meandering water passage from an inlet 13 to an outlet 14 formed at peripheral edges of the housing 10. Windows 24a, 25a of dimensions slightly larger than dimensions of plain surfaces of inner fins 30 received in each of circulation chambers defined by the wall faces 22 are formed on the upper and lower folded faces 24, 25, the inner fins 30 are received in the windows 24a, 25a, tops 31 and bottoms 32 of convex-shaped segments are kept into contact with the plates 11, 12, these component members are made of copper materials, and an assembly is brazed and joined in a heating furnace. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger applied to a heat pump type hot water heater using a high-temperature / high-pressure refrigerant (CO2 refrigerant) as a heat source.

As a heat exchanger for heat pump water heaters that use high-temperature and high-pressure refrigerant as a heat source, a thin box is formed by joining two drawn plates, and a tube through which the refrigerant flows is joined to the flat surface of the box And what heats the water which distribute | circulates the box is known (refer patent document 1). In this heat exchanger, a plurality of circulation chambers partitioned along the longitudinal direction are alternately communicated at the side end portions, and the meandering passage extending from the inlet opening at the peripheral edge of the box to the outlet opening at a position opposite to the inlet. A water channel is formed, heat is exchanged with the refrigerant circulating in the tube, and the water flowing through the water channel is heated. Inner fins are housed in each circulation chamber, and the heat efficiency is improved by increasing the heat transfer area.
JP 2002-5516 A

  The heat exchanger having such a configuration is complicated in the shape of the plate for forming the meandering water passage, increasing the man-hours for drawing, inferior in assembling workability and productivity such as brazing material installation, and in production cost. It was expensive. Moreover, it becomes a site | part which water does not distribute | circulate between adjacent circulation chambers, and it does not contribute to heat exchange, the physique of a heat exchanger becomes large with respect to desired capability, and there existed a restriction | limiting in size reduction.

  An object of the present invention is to solve these problems. A heat exchanger that can be manufactured at low cost by reducing the number of molding steps of a plate forming a box, improving assembly workability and productivity. It is intended to provide. It is another object of the present invention to propose a heat exchanger that can be reduced in size with respect to a desired capacity and realizes space saving in installation in equipment.

  In order to achieve such an object, the present invention forms a thin rectangular box that joins the peripheral edges of two drawn plates, joins a tube through which a refrigerant flows to the flat surface of the box, In a heat exchanger that heats the circulating water, cutouts are formed in the left and right alternating side edge positions of the wall surface of the rectangular corrugated plate, and the folded upper and lower surfaces of the corrugated plate are brought into contact with the plate and stored in the box. A meandering water passage is formed from the inlet opening at the peripheral edge of the box to the outlet opening at a position opposite to the inlet. Then, a window having a size (vertical x horizontal) slightly larger than the plane size of the inner fin housed in each distribution chamber partitioned by the wall surface is opened on the upper and lower folded surface, and the inner fin is accommodated in the window, and the convex segment The top and bottom of the plate are in contact with the plate. The above constituent members (plate, corrugated plate, inner fin, tube) are formed of a copper material, and the assembly is brazed in a heating furnace and joined.

  Moreover, in the heat exchanger comprised in this way, a plate is formed with the clad material which coat | covered the brazing material layer on both surfaces by making a copper plate into a core material.

  In the heat exchanger of the present invention, the corrugated plate having a rectangular wave shape is accommodated in the box to form a meandering water passage, so that the plate is formed with a flat surface on the entire surface, thereby reducing the number of drawing processes. In addition, the upper and lower folded surfaces of the corrugated plate are in contact with the plate, housed in a window opened in the upper and lower folded surface to store the inner fins in each distribution chamber, the top and bottom of the convex segments are in contact with the plate, Since the tube through which the refrigerant flows is in contact with the flat surface of the box, a brazing material is installed and assembled on the periphery of the plate, the front and back of the flat surface of the plate, and this assembly is brazed in a heating furnace. The constituent members can be joined together in a single brazing process. Accordingly, the assembly workability and productivity are extremely excellent, and the production cost is low.

  In addition, inner fins are housed in each distribution room partitioned by the wall surface, and heat efficiency is improved by increasing the heat transfer area, and heat exchange is performed through the entire flat surface of the box, so that heat exchange is performed. There is no part which does not contribute, it is possible to reduce the size of the desired capacity, and it is possible to realize space saving of installation in the device.

  Further, by forming the plate with a clad material in which a copper plate is used as a core material and a brazing material layer is coated on both sides, installation work of the brazing material becomes unnecessary, and further productivity improvement is possible.

Hereinafter, the best mode for carrying out the present invention will be specifically described based on examples.
The drawing is an embodiment of the present invention, and two thin plates (upper plate 11 and lower plate 12) drawn into a shallow container shape are joined to form a thin rectangular box 10 by joining their peripheral edges. A water inlet 13 is opened at the periphery of the body 10, and a water outlet 14 is opened at a position facing the water inlet 13. The plates 11 and 12 are formed of a clad material in which a copper plate is used as a core material 15 and a brazing material layer 16 is rolled and pressed into a thin film shape on both surfaces thereof.

  A corrugated plate 20 in which a corrugated copper plate is formed is housed in the box 10, and this corrugated plate 20 is a plain type whose upper and lower folded surfaces 24, 25 are flat and rectangular in cross section, and its outer dimensions (vertical × horizontal). X height) is adapted to the inner size of the box 10. Cutouts 22a are formed at left and right alternating side end positions of the wall surface 22 of the corrugated plate 20, and the wall surface 22 is stored in the box 10 in a state orthogonal to the water flow direction. It is in contact with the upper and lower plates 11 and 12. The inside of the box 10 is partitioned into a plurality of flow chambers by a wall surface 22, and as shown in FIG. 4, adjacent flow chambers communicate with each other through cutouts 22 a, and are folded back alternately at the left and right side ends to enter the outlet 14. A meandering waterway is formed.

  Copper inner fins 30 are accommodated in the respective distribution chambers, and upper and lower folded surfaces 24 and 25 have windows 24a and 25a having dimensions (longitudinal x lateral) slightly larger than the planar dimensions of the inner fins 30. This inner fin 30 is a type generally referred to as an offset type, in which convex segments are arranged in a staggered manner. The inner fins 30 are accommodated in the windows 24a and 25a, and the top 31 and bottom 32 of the convex segments are brought into contact with the plates 11 and 12. It touches.

  As the tube 40 through which the refrigerant circulates, a tube in which two capillary tubes (copper capillaries) are closely juxtaposed is used. As indicated by the arrows in FIG. 1, the tube 40 circulates from one side end side of the box 10 to the other side end side so that the refrigerant faces the water flow in the water passage. It is wound spirally around the outer periphery of the box 10 and joined to both flat surfaces on the front and back of the box 10.

  In this heat exchanger, the corrugated plate 20 is housed, the inner fins 30 are housed in the respective circulation chambers, the box body 10 is temporarily assembled, and the tube 40 is wound around the box body 10 and assembled with a predetermined jig. In the assembled state as shown in FIG. 7, the upper and lower folded surfaces 24 and 25 of the corrugated plate 20 abut against the plates 11 and 12, the inner fins 30 are accommodated in the windows 24a and 25a, and the convex segment The top portion 31 and the bottom portion 32 are in contact with the plates 11 and 12, and the tube 40 is in contact with the flat surface of the box 10. By putting this assembly into the heating furnace, the brazing material layer 16 is melted and the respective members are brazed, and the constituent members can be joined together in a single brazing process.

  As described above, the embodiment has been described, but when the plates 11 and 12 are formed of a copper plate without using a clad material, a paste-like brazing material is applied to each joint location or a foil-like brazing material is laid and assembled. This assembly can be brazed in a heating furnace, and the components can be joined together in a single brazing process. In addition, the tube 40 through which the refrigerant circulates can be wound around the outer periphery of the box 10 in a spiral manner, or can adopt a structure in which a large number of thin tubes are closely arranged in parallel.

The top view of the Example of this invention. Similarly front view. Sectional drawing of the AA line in FIG. Explanatory drawing of a water channel. The perspective view of a corrugated board. The disassembled perspective view of the principal part. The expanded sectional view of the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Box 11 and 12 Plate 13 Inlet 14 Outlet 15 Core material 16 Brazing material layer 20 Corrugated plate 22 Wall surface 22a Notch 24, 25 Folding surface 24a, 25a Window 30 Inner fin 31 Top part 32 Bottom part 40 Tube

Claims (2)

The thin rectangular box 10 is formed by joining the peripheral edges of the two drawn plates 11 and 12, the tube 40 through which the refrigerant flows is joined to the flat surface of the box 10, and the water flowing through the box 10 In the heat exchanger that heats
Cutouts 22a are formed at left and right alternating side end positions of the wall surface 22 of the corrugated plate 20 having a rectangular wave shape, and the upper and lower folded surfaces 24 and 25 of the corrugated plate 20 are brought into contact with the plates 11 and 12 and stored in the box 10. And forming a meandering water passage from the inlet 13 opened at the peripheral edge of the box 10 to the outlet 14 opened at a position opposite to the inlet 13,
On the upper and lower folded surfaces 24 and 25, windows 24a and 25a having a size (vertical x horizontal) slightly larger than the plane size of the inner fin 30 accommodated in each distribution chamber partitioned by the wall surface 22 are opened. 24a, 25a, the top 31 and bottom 32 of the convex segment abut the plates 11, 12,
A heat exchanger in which the above-described constituent members are formed of a copper material, and the assembly is brazed and joined in a heating furnace.   The heat exchanger according to claim 1, wherein the plates 11 and 12 are formed of a clad material in which a copper plate is a core material 15 and a brazing material layer 16 is coated on both surfaces.

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