JP2006078154A - Plate type heat exchanger and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve brazing quality and to improve workability and productivity by firmly inter-joining laminated heat transfer plates 10 by brazing, in a plate-type heat exchanger formed by laminating the heat transfer plates 10 molded in a predetermined shape in multiple layers. <P>SOLUTION: Opening holes 11 forming cylindrical projecting edges 12 with a predetermined depth in their rims are arranged on the whole surfaces of the heat transfer plates 10 with a predetermined interval. A small diameter section 12a that has a certain cylindrical length from the tip of the cylindrical projecting edge 12 and is inserted into the opening hole 11 of the next-stage heat transfer plate 10 is formed. The heat transfer plates 10 are laminated in multiple layers, the small diameter section 12a is inserted into the opening hole 11 of the next-stage heat transfer plate 10, the abutting surface is brazed, the cylindrical projecting edges 12 form connected tubular passages, and the tubular passages vertically penetrating the laminated heat transfer plates 10 are arranged with a predetermined interval. One-side fluid circulates inside the tubular passages, and the-other-side fluid circulates in a laminar space between the heat transfer plates 10, thereby exchanging heat. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plate heat exchanger formed by laminating a plurality of heat transfer plates formed into a predetermined shape.

  Conventionally, a plate heat exchanger is formed by laminating a plurality of heat transfer plates formed with continuous uneven surfaces such as corrugated and hemispherical shells by pressing a metal plate. A fluid channel having a narrow interval is formed between the two channels, and two types of fluids such as liquid-liquid and liquid-gas are alternately passed through the channel to perform heat exchange. It realizes high thermal efficiency by dramatically increasing the heat transfer area and is suitable for downsizing, and is widely used as a heat exchanger for refrigeration equipment, hot water equipment and the like.

As a manufacturing method of this plate type heat exchanger, a brazing material is installed between heat transfer plates and assembled with a predetermined jig, which is put into a heating furnace, and the top of the uneven surface of the stacked heat transfer plates is brazed. Means are used. However, there is a problem in securing strength and airtightness due to insufficient bonding area due to a lack of the bonding area of the abutting top. In addition, the work such as the installation of the brazing material and the assembly with the jig is complicated, the workability and the productivity are inferior, and the occurrence of defective products due to inadequate assembly is unavoidable. Proposals for improving these have been made (Japanese Patent Laid-Open No. 10-103883, Patent Document 1), but this is not a drastic improvement in terms of structure.
Japanese Patent Laid-Open No. 10-103883

  The present invention proposes a plate-type heat exchanger having a new structure and a method for manufacturing the plate-type heat exchanger, and the laminated heat transfer plates are firmly joined by brazing so that no joint failure occurs and the brazing quality is significantly improved. In addition, the present invention proposes a plate heat exchanger and a method for manufacturing the same that can reduce the occurrence of defective products due to imperfect assembly and can greatly improve workability and productivity.

  In order to solve such a problem, the plate heat exchanger according to claim 1 is a plate heat exchanger formed by laminating a plurality of heat transfer plates 10 formed into a predetermined shape, and has a predetermined periphery. Openings 11 having a cylindrical protruding edge 12 having a depth are arranged on the entire surface of the heat transfer plate 10 at a predetermined interval, and the next heat transfer plate 10 having a certain tube length from the tip of the cylindrical protruding edge 12. The reduced diameter portion 12a to be inserted into the opening 11 is formed, the heat transfer plate 10 is laminated in multiple layers, and the reduced diameter portion 12a is inserted into the opening 11 of the heat transfer plate 10 at the next stage. The contact surface is brazed to form a tubular passage 16 in which the cylindrical projecting edges 12 are connected, and the tubular passage 16 penetrating up and down the laminated heat transfer plate 10 is arranged at a predetermined interval. And one fluid distribute | circulates the inside of the tubular channel | path 16, and the other fluid distribute | circulates through the layered space between the heat exchanger plates 10, and it comprises so that heat exchange may be performed.

  The plate heat exchanger according to claim 2 is provided with a bottom surface 13 at the tip of the cylindrical projecting edge 12 and a through hole 14 having a predetermined shape on the bottom surface 13.

  The plate heat exchanger according to claim 3 is the plate heat exchanger according to claim 2, wherein a pair of notches are formed symmetrically on the bottom surface 13 and raised toward the center, and a pair of V-shaped heat exchangers are formed. The cut and raised pieces 15 are provided, and the through holes 14a are formed symmetrically.

  The plate heat exchanger according to claim 4 is the plate heat exchanger according to claim 3, wherein one of the pair of cut and raised pieces 15 is a lower half cut and raised piece 15a, and the other is cut of the upper half. The raised piece 15b is used.

  In the plate heat exchanger according to claim 5, in the plate heat exchanger, an insertion hole 18 for installing the brazing rod 19 is arranged in the heat transfer plate 10 in the vicinity of the opening 11.

  The manufacturing method of the plate heat exchanger according to claim 6 uses the heat transfer plate 10 according to claim 5, and the assembled heat transfer plate 10 so that the insertion hole 18 is positioned above the opening 11. The brazing rod 19 is installed in the insertion hole 18 and put into a heating furnace for brazing.

  In the plate heat exchanger according to the present invention, a reduced diameter portion 12a having a constant cylinder length is formed from the tip of the cylindrical protruding edge 12, and the reduced diameter portion 12a is inserted into the opening 11 of the heat transfer plate 10 at the next stage. Since the abutment surface is brazed, there is no poor bonding due to a sufficient joint area and a reasonable joint shape, and the heat transfer plate 10 is firmly joined by brazing, and the brazing quality is significantly improved. Can be achieved. Moreover, the assembly of the heat transfer plate 10 can be performed easily and reliably, and the occurrence of defective products due to inadequate assembly can be reduced.

  Further, in the plate heat exchanger according to claims 2 to 4, the contact area with the fluid flowing through the tubular passage 16 is increased, and the thermal efficiency can be improved.

  Moreover, according to the manufacturing method of the plate type heat exchanger of the present invention, the brazing rod 19 can be easily installed by being inserted into the insertion hole 18, and the brazing rod 19 is melted in the heating furnace to reduce the diameter-reduced portion. It penetrates into the gap between the outer peripheral surface of 12a and the inner peripheral surface of the aperture 11, and the contact surface is securely brazed in a gas-liquid tight manner, so that workability and productivity can be greatly improved.

  The best mode for carrying out the present invention will be specifically described below based on the embodiments shown in the drawings.

  1 to 7 show the first embodiment of the plate heat exchanger according to the present invention. A heat transfer plate 10 shown in FIG. 1 is formed by press-molding a rectangular plate made of copper or a copper alloy, circular openings 11 are arranged on the entire surface at predetermined intervals, A cylindrical protruding edge 12 having a depth is formed. A reduced diameter portion 12a is formed from the tip of the cylindrical projecting edge 12 with a certain cylinder length, and this reduced diameter portion 12a is reduced in diameter by the thickness of the plate, and as shown in FIG. It overlaps and it inserts in the opening 11 of the heat exchanger plate 10 of the next step. Folded rim portions 17 are formed on the left and right edges of the heat transfer plate 10, and the rim portion 17 overlaps the heat transfer plates 10 to form the side wall of the heat exchanger.

  FIG. 3 illustrates a brazing method for the plate heat exchanger. The reduced diameter portion 12a is sequentially fitted into the opening 11 of the heat transfer plate 10 at the next stage, and a predetermined number of heat transfer plates 10 are stacked and assembled. Next, as shown in the figure, the assembled heat transfer plate 10 is set up so that the insertion hole 18 is positioned above the opening 11, and the brazing rod 19 (phosphorous copper brazing) is inserted into the insertion hole 18. And put it into the heating furnace and braze it. The brazing rod 19 is heated and melted, enters the gap between the outer peripheral surface of the reduced diameter portion 12a and the inner peripheral surface of the opening 11, and the contact surface is brazed in a gas-liquid tight manner, and at the same time, the rim portion 17 Braze. As a result, the heat transfer plates 10 are laminated in multiple layers to form a tubular passage 16 in which the cylindrical projecting edges 12 are connected, and the tubular passage 16 penetrates vertically and is arranged at a predetermined interval.

  4 to 6 show the plate heat exchanger manufactured in this manner. As shown in the figure, an inlet-side header 20 that forms an inlet space for fluid is brazed to the bottom surface of the laminated heat transfer plate 10, and an outlet-side header 22 that forms an outlet space on the upper surface of the heat transfer plate 10 is brazed. The inlet side header 20 has a fluid inlet opening 21 and the outlet side header 22 has an outlet opening 23. Each space of the inlet side header 20 and the outlet side header 22 communicates with each tubular passage 16.

  This plate heat exchanger is a heat exchanger that performs heat exchange between a primary-side high-pressure gas and a secondary-side low-pressure gas. As shown in FIG. 6, the primary high-pressure gas is circulated through the inlet opening 21, the inlet-side header 20, each tubular passage 16, the outlet-side header 22, and the outlet opening 23 (arrows in the figure), and the secondary-side low-pressure gas is supplied. Air is blown from the front to the back of the plate heat exchanger (the white arrow in the figure) and supplied to the layered space between the heat transfer plates 10. The heat transfer plate 10 functions as a heat transfer fin, and heat exchange is performed between the primary side high pressure gas and the secondary side low pressure gas.

  7 and 8 show a heat transfer plate 10 used in this embodiment, which is a second embodiment of the plate heat exchanger of the present invention. As shown in the figure, a bottom surface 13 is provided on the cylindrical projecting edge 12 of the opening 11, and a through hole 14 cut out in a predetermined shape is formed on the bottom surface 13. By providing the bottom face 13 on the cylindrical projecting edge 12, the contact area with the primary high-pressure gas flowing through the tubular passage 16 is increased, and the heat transfer area is increased.

  9 and 10 show a third embodiment of the plate heat exchanger of the present invention, and show a heat transfer plate 10 used in this embodiment. As in the previous example, this heat transfer plate 10 is provided with a bottom surface 13 on the cylindrical projecting edge 12, a pair of semi-circular cuts are formed on the bottom surface 13 in a bilaterally symmetrical manner, raised toward the center, and paired in a V shape. And a semicircular through hole 14a is formed symmetrically. As shown in FIG. 10, the V-shaped cut-and-raised piece 15 is fitted into the opening interval of the next-stage cut-and-raised piece 15 with the heat transfer plates 10 being stacked. By forming the cut-and-raised piece 15, the contact area with the primary-side high-pressure gas is further increased.

  FIGS. 11 and 12 show a heat transfer plate 10 used in the fourth embodiment of the plate heat exchanger according to the present invention. As in the previous example, this heat transfer plate 10 is provided with a pair of cut and raised pieces 15 in a V shape, one of the cut and raised pieces 15 being a lower half cut and raised piece 15a, and the other being an upper half cut and raised piece 15b. It is what. By forming the cut-and-raised piece 15 in this way, the primary high-pressure gas generates an upward flow indicated by a broken-line arrow in FIG. 12 and circulates through the tubular passage 16 to further improve the thermal efficiency. Is. In addition, it can also comprise so that a vortex | eddy_current may be produced in primary side high pressure gas like a present Example by inserting a twist board and a coil in the tubular channel | path 16 shown in Example 1. FIG.

  The top view of a heat exchanger plate in 1st Example of this invention.   The expanded sectional view of the AA line in FIG.   It is explanatory drawing of the brazing method, and is an expanded sectional view of the principal part.   The front view of a plate type heat exchanger.   The side view of a plate type heat exchanger.   The perspective view of a plate type heat exchanger.   The enlarged plan view of a part of heat exchanger plate in 2nd Example of this invention.   The expanded sectional view of the BB line in FIG.   The 3rd Example of this invention WHEREIN: The one part enlarged plan view of a heat exchanger plate.   The expanded sectional view of the CC line in FIG.   In 4th Example of this invention, the one part enlarged plan view of a heat exchanger plate.   The enlarged view of an opening.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heat-transfer plate 11 Opening hole 12 Cylindrical edge 12a Reduced diameter part 13 Bottom face 14 Through-hole 15 Cut and raised piece 16 Tubular passage

Claims (6)

A plate type heat exchanger formed by laminating a plurality of heat transfer plates 10 formed in a predetermined shape,
Openings 11 having a cylindrical protruding edge 12 having a predetermined depth at the periphery are arranged on the entire surface of the heat transfer plate 10 at predetermined intervals, and the next stage transfer is performed from the tip of the cylindrical protruding edge 12 with a certain tube length. Forming a reduced diameter portion 12a to be inserted into the opening 11 of the hot plate 10;
A tubular passage in which the heat transfer plates 10 are laminated in multiple layers, the reduced diameter portion 12a is inserted into the opening 11 of the heat transfer plate 10 in the next stage, the contact surface thereof is brazed, and the cylindrical protruding edges 12 are connected. 16 is disposed, and the tubular passages 16 penetrating the stacked heat transfer plates 10 vertically are arranged at predetermined intervals,
A plate heat exchanger configured such that one fluid flows in the tubular passage 16 and heat exchange is performed by the other fluid flowing in the layered space between the heat transfer plates 10.   The plate heat exchanger according to claim 1, wherein a bottom surface 13 is provided at a tip of the cylindrical protruding edge 12, and a through hole 14 having a predetermined shape is formed on the bottom surface 13.   The plate type according to claim 2, wherein a pair of cuts are formed symmetrically on the bottom surface 13 and raised toward the center, a pair of cut and raised pieces 15 are provided in a V shape, and a through hole 14a is formed symmetrically. Heat exchanger.   4. The plate heat exchanger according to claim 3, wherein one of the pair of cut and raised pieces 15 is a lower half cut and raised piece 15a, and the other is an upper half cut and raised piece 15b.   The plate-type heat exchanger according to claim 1, 2, 3, or 4, wherein an insertion hole 18 for installing the brazing rod 19 is disposed in the heat transfer plate 10 in the vicinity of the opening 11.   Using the heat transfer plate 10 according to claim 5, the assembled heat transfer plate 10 is erected so that the insertion hole 18 is positioned above the opening 11, and the brazing rod 19 is installed in the insertion hole 18. , A method of manufacturing a plate heat exchanger in which this is put into a heating furnace and brazed.

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