JP2003314976A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for heat exchange between two types of fluids, having improved heat efficiency by increasing its heat transfer area and having saved installation space by reducing its size. <P>SOLUTION: An opening hole 21 is formed in the bottom of a container 20 molded into an oblong vessel container, at one side end. A required number of containers 20 are stacked alternately turning their directions rightward and leftward and joined at their stacked peripheral edges with air tightness into a stacked structure to form one fluid passage ranging from the uppermost stage to the lowermost stage (or from the lowermost stage to the uppermost stage). A tubing is spirally wound on the stacked structure and joined to both side walls of the container to form the other fluid passage. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging heat between two kinds of fluids, and more particularly to a heat exchanger applied to a heat pump type water heater using a refrigerant.

[0002]

2. Description of the Related Art In a heat exchanger incorporated in a heat pump type hot water supply system using a refrigerant as a heat source, a high temperature / high pressure refrigerant (CO2 refrigerant) is used.
In recent years, a heat exchanger of this type in which a large number of capillary tubes (copper thin tubes of φ several mm) are closely arranged to form a refrigerant passage has been proposed. This heat exchanger enables the use of high-pressure refrigerant by using a capillary tube, and is designed to promote efficient condensation with a small diameter. The water passage is a thin type with two plates formed by drawing. It is made of a box.
Then, the inner fins are housed in the box body, the capillary tube is laminated on the box body, and these members are made of copper material, so that they can be collectively joined by brazing.

[0003]

In the heat exchanger having such a structure, the shape of the inner fin is complicated in order to obtain a sufficient heat transfer area, the processing is complicated, and the cost is high. In addition, a long capillary tube is used to provide a predetermined capacity, and the outer shape of the heat exchanger is thin and long, which limits the installation in the device.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and the thermal efficiency is improved by the dramatic increase of the heat transfer area, and the miniaturization saves the installation space and the assembling work. It is an object of the present invention to provide a heat exchanger that is excellent in productivity and productivity and that can be manufactured at a low cost.

[0005]

According to a first aspect of the present invention, there is provided a heat exchanger having a laterally elongated boat-shaped container body having an opening formed at one side end position at a bottom portion thereof. , A required number of container bodies are stacked alternately with the left and right directions alternately, and the polymerized peripheral edges are airtightly joined to form a laminated body, and one of the top to the bottom (or the bottom to the top) Form a fluid passage. Then, the thin tube is spirally wound around the laminated body and joined to both side walls of the container body to form a passage for the other fluid.

With this construction, the bottom of the container divides the laminated body into a large number of folded flow passages, and the flow passage is formed to be extremely long. Then, the bottom portion of the container body functions as a heat transfer fin, heat exchange is performed with the other fluid flowing in the narrow tube joined to the side wall, and the heat efficiency is improved by the dramatic increase in the heat transfer area. Can be downsized.

In the heat exchanger of the second aspect of the present invention, a required number of containers are similarly stacked to form a laminated body, and one from the uppermost stage to the lowermost stage (or the lowermost stage to the uppermost stage). In addition to forming the fluid passage, the thin tube branched into two paths is serpentine-shaped meandering on each side surface of the laminated body and joined to each side wall of the container body to form the other fluid passage. Similarly, in this heat exchanger, a large number of folded flow paths are formed in the laminated body, heat exchange is performed with the other fluid flowing in the narrow tube, and the thermal efficiency is improved by a dramatic increase in the heat transfer area. The heat exchanger can be miniaturized.

In these heat exchangers, the passage for the other fluid may be formed by closely arranging a plurality of thin tubes. In the heat exchanger of the present invention, one fluid is water and the other fluid is water. The present invention is particularly applied to a heat pump type water heater in which the fluid is a refrigerant.

Further, the constituent members are made of copper material and the assembly is brazed in the heating furnace so that they can be collectively joined in one step, and the long side of the opening edge of the container body To
By forming the inclined piece that is open outwardly on which the brazing material is placed, the brazing material can be easily installed and the overlapped peripheral edges can be airtightly joined.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the examples of the drawings. 1 to 5
Is an application example of the heat exchanger incorporated in the heat pump type water heater using the refrigerant in the embodiment of the first invention. In the figure, a container body 20 is formed into a horizontally long boat-shaped container shape by drawing a copper plate, and an opening 21 is formed at one side end position in the bottom thereof.
Are formed. A required number of container bodies 20 are stacked alternately with the left and right directions alternately, and the polymerized peripheral edges are airtightly joined to form a laminated body, and the inlet pipe 3 is formed in the uppermost opening 21.
No. 0, the outlet pipe 31 is joined to the opening 21 in the lowermost stage to form a water passage extending from the uppermost stage to the lowermost stage.

The coolant passage is formed by spirally winding a copper thin tube 10 around a laminated body, and the thin tube 10 is joined to both side walls (front side and back side) of the container body 20.

Explaining the manufacturing method of this heat exchanger, as shown in FIGS. 3 and 4, the upper edge of the container body 20 is widened to form a lap joint portion 22 with which the outer edge of the bottom of the container body 20 to be overlapped abuts. On the long side of the opening edge of the container body 20, an inclined piece 23 that is open outward is formed. The required number of the container bodies 20 are stacked by alternating the left and right directions, the thin tubes 10 are wound around the container bodies 20, brazing material is installed on each joint surface, and assembled by a predetermined jig. A brazing material 24 is placed on the inclined piece 23, and this assembly is placed in a heating furnace and brazed. The molten brazing material 24 is attached to the outer edge of the bottom of the container 20 and the lap joint 22.
The capillary 10 flows into the gap by a capillary phenomenon to form an airtightly bonded laminate, and the capillaries 10 are bonded to both side walls of the container body 20. In this way, it is manufactured by one-step collective bonding.

In the heat exchanger configured as described above,
The state of the water passage formed in the laminate is shown in FIG. As shown in the figure, the laminated body is partitioned by the bottom of the container body 20,
The upper and lower stages of the water passage are communicated with each other through the opening 21, and the water passage is a meandering passage that is alternately folded back at the left and right side ends, and the entire length thereof is extremely long, which is the length of the container body 20 times the number of turns. Water flowing from the inlet pipe 30 into the laminated body flows through this long-distance water passage, and the high-temperature and high-pressure refrigerant flows inside the thin tube 10 spirally wound around the laminated body, and passes through both side walls of the container body 20. Heat is exchanged, the bottom portion of the container 20 functions as a heat transfer fin, the water is heated, and hot water is discharged from the outlet pipe 31.

FIGS. 6 and 7 show an embodiment of the second invention, which is an application example of a heat exchanger incorporated in a heat pump type hot water supply device which also uses a refrigerant. In this heat exchanger, a required number of container bodies 20 are stacked in an alternating manner in the left and right directions and airtightly joined to form a laminated body, and the inlet pipe 30 to the outlet pipe 31 are formed in the same configuration as the previous example. It forms a waterway leading to it.

The refrigerant passage is branched into two passages, and two copper thin tubes 12 and 13 are branched into a front side and a back side of the laminated body, and serpentinely meandered on each side surface and joined to each side wall of the container body 20. ing.

This heat exchanger is manufactured by brazing in the heating furnace in the same manner as in the previous example, and the water flowing from the inlet pipe 30 into the laminate is also in the long-distance meandering water passage formed in the laminate. Capillary tube 12 that circulates and branches high temperature and high pressure refrigerant,
13 and heat is exchanged through both side walls of the container body 20 to be heated and discharged from the outlet pipe 31.

Although the respective embodiments have been described in detail above, the present invention relates to another heat exchange for exchanging heat between two kinds of fluids, in addition to the heat exchanger incorporated in the heat pump type water heater using the refrigerant. Applicable to vessels, thin tubes 10, 12, 1
The fluid flowing through 3 is not necessarily limited to the refrigerant.

[0018]

According to the heat exchanger of the present invention, the bottom of the container body 20 divides the laminated body into a large number of folded flow passages, the total length of the flow passage is made extremely long, and the bottom portion of the container body is transferred. Functions as a heat fin. In the first invention, the thin tube 10 is spirally wound around the laminated body, and in the second invention, the side walls of the laminated body are serpentinely meandered to use the long thin tubes 10, 12, and 13. It is possible,
In both configurations, heat exchange is performed via both side walls of the container body 20, the heat transfer area is dramatically increased, and the thermal efficiency is extremely excellent. As a result, the heat exchanger can be downsized,
It is possible to save space for installation inside the device.

Further, the laminated body is assembled by stacking one type of container body 20 with the direction reversed, and the component structure is simple and suitable for mass production, and the assembling work is easy. Further, the constituent members are formed of a copper material, and the assembled product is brazed in a heating furnace to be manufactured, so that it is possible to perform jointing in a single step, and to braze the long side of the opening edge of the container body 20. By forming the inclined piece 23 that is opened outward to mount the material 24,
The brazing material 24 can be easily installed and can be visually confirmed to prevent misplacement, improving workability and productivity.
The manufacturing cost can be significantly reduced.

In the heat exchanger of the present invention, the number of container bodies 20 is set according to the capacity of the heat exchanger, and the capacity can be adjusted according to the equipment by increasing or decreasing the number of stacks. It has a wide range.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the first invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is an exploded perspective view showing the assembly of the laminated body.

FIG. 4 is a side view showing the assembly of the laminated body.

FIG. 5 is an explanatory view of a water passage.

FIG. 6 is a front view of an embodiment of the second invention.

FIG. 7 is a bottom view of the same.

[Explanation of symbols]

10, 12, 13 thin tubes 20 container 21 hole 23 Inclined piece 24 brazing material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Okinoya             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Ken Yamamoto             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Masahisa Uenishi             Gunma Prefecture Kiryu City 1-8-12 Miyamotocho Stock             Company Atago Factory (72) Inventor Noboru Otomo             Gunma Prefecture Kiryu City 1-8-12 Miyamotocho Stock             Company Atago Factory F-term (reference) 3L036 AA02 AA42                 3L103 AA05 BB43 CC02 CC28 DD05

Claims (6)

[Claims] 1. A container body 20 formed into a horizontally long boat-shaped container shape.
An opening 21 is formed at one side end position on the bottom of the container, and a required number of container bodies 20 are stacked by alternately alternating the left and right directions, and the polymerized peripheral edges are airtightly joined to form a laminate, A passage for one fluid from the uppermost stage to the lowermost stage (or the lowest stage to the uppermost stage) is formed, the thin tube 10 is spirally wound around the laminated body, and the thin tube 10 is joined to both side walls of the container body 20 to connect the other fluid. Heat exchanger that formed the passage of. 2. A container body 20 formed in a horizontally long boat-shaped container shape.
An opening 21 is formed at one side end position on the bottom of the container, and a required number of container bodies 20 are stacked by alternately alternating the left and right directions, and the polymerized peripheral edges are airtightly joined to form a laminate, One of the fluid passages from the uppermost stage to the lowermost stage (or the lowermost stage to the uppermost stage) is formed, and the thin tubes 12 and 13 branched into two paths are made to meander in a serpentine shape on each side surface of the laminated body to form a container body 20. A heat exchanger joined to each side wall of the to form a passage for the other fluid. 3. The heat exchanger according to claim 1, wherein a plurality of thin tubes 10 are closely arranged side by side to form a passage for the other fluid. 4. The heat exchanger according to claim 1, wherein one fluid is water and the other fluid is a refrigerant. 5. The heat exchanger according to claim 1, 2, 3 or 4, wherein the constituent members are made of a copper material and the assembly is brazed in a heating furnace. 6. The heat exchanger according to claim 5, wherein an inclined piece 23 is formed on the long side of the opening edge of the container body 20 so as to mount the brazing material 24 and open outward.