JP3996300B2 - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a thermal efficiency and to enhance a strength of a cylindrical heat exchange cylinder, by forming the heat exchange cylinder in an integral structure of an aluminum material having a plurality of holes penetrating from one end to the other end and arranged in section between an outer wall and an inner wall of the exchange cylinder. SOLUTION: The heat exchanger comprises a cylindrical heat exchange cylinder 2 made of an aluminum extruded material, and a heat exchange pipe made of a copper tube spirally wound on an outer periphery of the cylinder 2. A fluid to be heated is forcibly circulated and heated in the pipe. The cylinder 2 is integrally formed of an aluminum extruded material of a double tube structure having a plurality of substantially rectangular holes 8 annularly arranged to become a combustion exhaust gas channel penetrating from one end to the other end axially in section between an outer wall and an inner wall of the thick cylinder. A large hole 9 at a center shuts off flowing by a blocking plate to distribute combustion exhaust gas all through the holes 8 from a burner unit.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger in which a heat exchange pipe is wound around an outer periphery of a cylindrical heat exchange cylinder, and a fluid flowing in the heat exchange pipe is heated by passing combustion exhaust gas through the heat exchange cylinder. In particular, it is suitable for heat exchangers of refrigerant heaters.
[0002]
[Prior art]
Conventionally, in this type of heat exchanger, as disclosed in, for example, Japanese Patent Application Laid-Open No. 9-229574, on the outer periphery of a heat exchange cylinder having a large number of fins projecting toward the central axis. There was one with a heat exchange pipe wrapped around it.
[0003]
[Problems to be solved by the invention]
By the way, with this conventional one, the passage route of the combustion exhaust gas is not fixed, and there are many combustion exhaust gases that do not contribute to heat exchange and the heat efficiency is poor, and the heat exchange cylinder is weak in structure, and when the heat exchange pipe is wound In addition, there is a strong risk of flattening during transportation of the heat exchange cylinder.
[0004]
[Means for Solving the Problems]
The present invention pays attention to this point and solves the above-described drawbacks. In particular, in the heat exchanger in which the heat exchange pipe is wound around the outer periphery of the cylindrical heat exchange cylinder, the heat exchange cylinder is It is an integral structure of aluminum material in which a plurality of holes penetrating from one end to the other end are arranged in the meat portion between the outer wall surface and the inner wall surface of the heat exchange cylinder, and the outer wall surface of the heat exchange cylinder is axially A plurality of grooves are provided, and the groove has a C-shaped cross section and is continuously provided from one end to the other end of the heat exchange cylinder, and a female is formed in the opening of the groove at the end face of the heat exchange cylinder. A screw portion is provided .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The heat exchange tube 2 of the heat exchanger 1 in which the heat exchange pipe 3 is wound around the outer periphery of the heat exchange tube 2 is attached to the wall portion between the outer wall surface and the inner wall surface of the thick heat exchange tube 2. This is a single-piece double tube structure of aluminum extruded material in which a plurality of holes 8 penetrating from one end to the other in the direction are arranged in an annular shape, and the heat exchange rate is improved by increasing the surface area that absorbs heat from the combustion exhaust gas. At the same time, the double pipe structure increases the strength.
[0009]
Further, by inserting a metal plate 15 made of stainless steel into the hole 8 of the heat exchange cylinder 2, the heat exchanger 1 can be easily improved by improving the heat exchange rate and increasing the heat capacity by promoting the turbulent flow of the combustion exhaust gas. The same heat exchange cylinder 2 can be commonly used for a plurality of models having different capacities.
[0010]
Further, by providing a plurality of grooves 11 in the axial direction on the outer wall surface of the heat exchange cylinder 2, the thermal expansion of the heat exchange cylinder 2 is absorbed and the durability of the heat exchanger 1 is enhanced.
[0011]
The groove 11 has a C-shaped cross section and is provided continuously from one end to the other end of the heat exchange cylinder 2, and a female screw part 13 is provided at the opening of the end face of the heat exchange cylinder 2 of the groove 11. Therefore, the burner unit 4, the exhaust unit 6, and the like can be easily fixed by a fixing means having a male screw such as a bolt 14.
[0012]
【Example】
Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a heat exchanger, which is composed of a cylindrical heat exchange cylinder 2 made of an extruded aluminum material and a heat exchange pipe 3 made of a copper pipe spirally wound around the outer periphery of the heat exchange cylinder 2. Yes. Here, a fluid to be heated (here, a refrigerant used in a refrigeration cycle such as R22) is forcedly circulated and heated in the heat exchange pipe 3 by a pump (not shown) or a compressor (not shown) instead of the pump. Is.
[0013]
4 is a burner unit that heats the heat exchanger 1 and is attached to one end of the heat exchanger 1 via a mounting plate 5, and 6 is an exhaust that collects combustion exhaust gas after passing through the heat exchanger 1. An exhaust unit leading to the pipe 7 is attached to the other end of the heat exchanger 1.
[0014]
The heat exchange cylinder 2 of the heat exchanger 1 is a substantially rectangular shape that penetrates from the one end to the other end in the axial direction in the wall portion between the outer wall surface and the inner wall surface of the thick tube body to form a combustion exhaust gas passage. Are formed integrally from an extruded aluminum material having a double tube structure in which a plurality of holes 8 are arranged in a ring shape, and the large hole 9 at the center of the heat exchange cylinder 2 is blocked by a closing plate 10 to be burned. All of the combustion exhaust gas from the unit 4 flows through the hole 8 and is wound around the outer periphery of the heat exchange cylinder 2 using the entire inner peripheral surface of the hole 8 as a surface for absorbing heat from the combustion exhaust gas. Since heat is exchanged with the fluid to be heated flowing in the heat exchange pipe 3, the surface area of the flow path through which the combustion exhaust gas flows can be increased, the heat exchange rate can be greatly improved, and the integrally formed double pipe structure The strength of the heat exchange cylinder 2 can be greatly improved. It is.
[0015]
A plurality of grooves 11 having a C-shaped cross section are provided on the outer wall surface of the heat exchange cylinder 2, and volume increase and stress due to thermal expansion of the heat exchange cylinder 2 due to heating of the heat exchanger 1 are applied to the grooves 11. To prevent metal fatigue of the heat exchange pipe 3 due to thermal expansion of the heat exchange cylinder 2 and destruction due to thermal expansion of the heat exchange cylinder 2 itself, and to improve the durability of the heat exchanger 1, Furthermore, since the female threaded portion 13 is engraved in the opening 12 at both ends of the groove 11, the burner unit 4 is disposed at one end of the heat exchange cylinder 2, and the exhaust unit 6 is disposed at the other end as a male screw such as a bolt 14. Therefore, the inside of the heat exchange cylinder 2 can be easily maintained. Here, although the burner unit 4 is attached via the attachment plate 5, it is attached via the appropriate attachment plate 5 by the structure of the burner unit 4, and may be attached directly to the heat exchange cylinder 2. Is.
[0016]
Here, by inserting a metal plate 15 made of stainless steel into the hole 8 of the heat exchange cylinder 2, the heat exchange rate can be improved by inducing turbulence in the flow of combustion exhaust gas, and the heat capacity can be easily increased. Therefore, the capacity of the heat exchanger 1 can be easily changed by changing the shape and the number of the metal plates 15, and the degree of freedom in design is increased, so that the same heat exchange cylinder 2 can be increased in capacity. Can be used in common with multiple models of different sizes. The metal plate 15 can be arbitrarily selected at the time of designing various shapes such as a flat plate shape, a V-shaped cross section, a corrugated plate shape, a length, a width, and the like according to the capacity setting of the heat exchanger 1.
[0017]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the heat absorption area in a heat exchange cylinder can be expanded, a heat exchange rate can be improved, and intensity | strength can be improved significantly.
[0018]
In addition, by inserting a metal plate into the hole of the heat exchange cylinder, the capacity of the heat exchanger can be easily changed by changing the shape and number of metal plates. Can be used in common with multiple models of different sizes.
[0019]
Moreover, by providing a groove in the axial direction on the outer peripheral wall of the heat exchange cylinder, it is possible to absorb the thermal expansion of the heat exchange cylinder and enhance the durability of the heat exchanger.
[0020]
Further, since the groove has a C-shaped cross section and is provided with female screw portions at the opening portions at both ends, the fixing means having a male screw such as a bolt is used to fix the burner unit, the exhaust unit, etc. using a groove that absorbs thermal expansion. Can be fixed easily.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a heat exchanger according to an embodiment of the present invention.
FIG. 2 is a perspective view of the heat exchange cylinder.
FIG. 3 is a cross-sectional view of the heat exchange cylinder taken along the plane 2A-BCDEF in FIG.
FIG. 4 is a perspective view in which a flat metal plate is inserted into the heat exchange cylinder.
FIG. 5 is a perspective view showing another embodiment of the metal plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Heat exchange cylinder 3 Heat exchange pipe 8 Hole 11 Groove 12 Opening part 13 Internal thread part 15 Metal plate

Claims (1)

In a heat exchanger in which a heat exchange pipe is wound around the outer periphery of a cylindrical heat exchange cylinder, the heat exchange cylinder is connected to the meat part between the outer wall surface and the inner wall surface of the heat exchange cylinder from one end to the other. An aluminum material integrated structure in which a plurality of holes penetrating to the end are arranged, and a plurality of grooves are provided in the axial direction on the outer wall surface of the heat exchange cylinder, and the grooves have a C-shaped cross section and the heat exchange cylinder A heat exchanger characterized by being provided continuously from one end of the body to the other end, and having an internal thread at the opening of the groove at the end face of the heat exchange cylinder .

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