JP2002350088A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger, in which accumulators 20 are jointed on both open ends of plate-shaped tubes to form a path for a fluid (refrigerant in this example), and the structure of the closing end of the accumulator 20 is simplified to reduce the manufacturing cost. SOLUTION: A stop 26 having a post shape is inserted in one open-end of the accumulator 20, and the stop 26 is airtightly inserted by a predetermined amount of insertion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which an accumulator is joined to both open ends of a tube formed in a flat plate shape to form a passage for one fluid for heat exchange.

[0002]

2. Description of the Related Art A heat exchanger incorporated in a heat pump type water heater using a refrigerant is designed to exchange heat between a primary side through which high-pressure gas refrigerant flows and a secondary side through which water as a fluid to be heated flows. There is a need for a structure that is constructed and sufficiently withstands high-pressure refrigerant. In recent years, a heat exchanger has been proposed in which the primary side is formed by closely contacting a number of capillary tubes (copper thin tubes of several mm in diameter).

FIG. 4 shows an example of the configuration of this heat exchanger. A tube row 12 in which a large number of capillary tubes 10 are closely attached and formed is formed. An inlet 21 and an outlet 22 for the refrigerant are opened at the other end to form a refrigerant passage (solid line arrow in the figure). The secondary side through which the water to be heated flows,
Peripheries of the two swelled plates (copper plates) are joined to form a thin box shape (hereinafter, referred to as a core plate 30), and a plurality of hollow chambers partitioned along the longitudinal direction are formed at side ends. The passages are alternately connected to form a meandering water passage (indicated by a dashed arrow in the figure) from an inlet 31 opened at one end to an outlet 32 opened at the other end.

In this heat exchanger, the opening end of the tube row 12 is fitted with an appropriate insertion amount from a long hole 24 formed in the side wall of the accumulator 20, and a lid 25 is attached to one opening end of the accumulator 20. (See FIG. 5), the tube row 12 and the core plate 30 are stacked and assembled, a brazing material is set in a predetermined position, and the brazing material is carried into the furnace.
Produced by brazing. Many capillary tubes 1
The use of a high-pressure gas refrigerant enables the use of a high-pressure gas refrigerant, and the use of copper as a member enables joint joining by brazing, improving productivity and reducing manufacturing costs. It is intended.

[0005]

In the heat exchanger in which the closed end of the accumulator 20 is formed as described above,
The lid 25 attached to the closed end is formed in a cap shape that fits the end of the accumulator 20, and its production requires time and labor by using a metal mold, and the production cost is expensive and unsuitable for mass production. Met.

According to the present invention, an accumulator 20 is joined to both open ends of a tube (tube row in this embodiment) formed in a very flat and flat plate-shape to form one fluid passage (refrigerant in this embodiment). In the formed heat exchanger, a new configuration of the closed end of the accumulator 20 is proposed, and it is possible to obtain an inexpensive structure with an extremely simple structure, and to significantly reduce manufacturing costs by improving assembly workability. Things.

[0007]

In order to achieve the above object, in the heat exchanger of the present invention, an accumulator is joined to both open ends of a flat tube to form one fluid passage. The heat exchanger is characterized in that a plug having a short columnar shape is fitted into one opening end of the accumulator with a predetermined burial amount, and this is hermetically bonded.

In the heat exchanger having such a configuration, the plug is brazed and joined, so that a plug enduring the use of a high-pressure refrigerant is used at the closed end of the accumulator in the brazing step of the furnace of the heat exchanger. It can be formed simultaneously. In the case of brazing in this manner, a ring wax is wrapped in advance at a predetermined position on the side wall of the plug, and the ring wax is brought into contact with the end face of the accumulator, and the plug is fitted, so that a fixed burying amount is obtained. The plug can be attached, and special processing such as forming a positioning projection on the plug can be eliminated.

Further, in the heat exchanger of the present invention, a flat tube can be formed by a tube row in which a number of capillary tubes are closely arranged and juxtaposed. It is suitable for those using a high-pressure refrigerant.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below with reference to the drawings. Figures 1 to 3
In the embodiment of the present invention shown in FIG. 1, a short pillar-shaped plug 26 is inserted into one opening end of the accumulator 20 with a predetermined embedding amount, brazed and joined, and the closed end of the accumulator 20 is closed. To form. The plug 26 is
The accumulator 2 is not necessarily limited to solid short rods.
It has an outer shape conforming to the inner wall shape of No. 0 and can be fitted into the opening end, and does not particularly have a positioning projection or the like.

The ring wax 16 is previously wound at a predetermined position on the side wall of the plug 26 using a jig 45 as shown in FIG. The jig 45 is formed with a plurality of bottomed holes 46 having a depth that defines the amount of plug 26 to be buried. The ring wax 16 is arranged on the opening surface of the bottomed hole 46, and the plug 26 is fitted into the bottomed hole 46. By doing so, the ring wax 16 is wound around the side wall of the plug 26 at a predetermined position. Using the plug 26 on which the ring wax 16 has been wound in advance, the ring wax 16 is brought into contact with the end face of the accumulator 20 and fitted (see the imaginary line in FIG. 1 and FIG. 3). In this manner, the plug 26 can be attached with a fixed burying amount, and no special processing such as forming a positioning projection on the plug 26 is required.

FIG. 3 shows an assembled state for carrying into a furnace. At one open end of the accumulator 20,
The plug 26 is inserted with a predetermined amount of embedding by the above-described means, and the spacer 40 is inserted from the other open end (the inlet 21 or the outlet 22), and the open end of the tube row 12 inserted from the long hole 24 of the accumulator 20. Is brought into contact with the spacer 40 and assembled, carried into a furnace and brazed. The spacer 40 is a furnace jig formed in a semicircular rod shape that can be inserted into the accumulator 20 and is removed after brazing. By setting the open end of the tube array 12 in contact with the spacer 40, the insertion amount of the tube array 12 into the accumulator 20 is constant regardless of the extension of the capillary tube 10 caused by the high ambient temperature in the furnace. Can be kept at a depth of

The ring wax 16 melted in the furnace penetrates into the embedded portion of the plug 26 by capillary action, solidifies in the cooling step, and the plug 26 is firmly joined. The closed end of the accumulator 20 is filled with high-pressure refrigerant. A plug that can withstand use is formed.

The embodiment of the drawings has been described in detail above.
The heat exchanger of the present invention is formed by joining the accumulators 20 to both open ends of a tube that is formed in a very flat and flat shape, and a flow passage that flows the tube from one accumulator 20 to the other accumulator 20. The present invention is applicable to a heat exchanger formed with: Further, the fluid flowing therethrough is one fluid that exchanges heat, and is not necessarily limited to the refrigerant.

[0015]

The heat exchanger of the present invention is constructed as described above, and a plug 26 having a short columnar shape is fitted into one open end of the accumulator 20 with a predetermined burial amount, and this is airtightly sealed. The plug body 26 has a simple shape and the structure of the closed end is extremely simple, and by joining the plug body 26 by brazing, in the process of brazing the furnace inside the heat exchanger, At the closed end of the accumulator 20, an embedding plug that can withstand the use of a high-pressure refrigerant can be formed at the same time, and the production cost can be significantly reduced, which is suitable for mass production.

When the plug 26 is brazed and joined, the plug 2 in which the ring wax 16 is previously wound at a predetermined position is used.
6, the ring wax 16 is brought into contact with the end face of the accumulator 20 and fitted therein, so that the plug 2
6 can be attached, special processing such as formation of a positioning projection on the plug 26 can be omitted, and assembling workability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment of the present invention.

FIG. 2 is an explanatory view of a method of winding a ring wax around a stopper.

FIG. 3 is an explanatory view showing a state where the apparatus is assembled to be carried into a furnace.

FIG. 4 is a perspective view showing a configuration of a conventional heat exchanger.

FIG. 5 is an exploded perspective view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Capillary tube 12 Tube row 16 Ring row 20 Accumulator 26 Plug

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsuyoshi Okinoya 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. Inside DENSO Corporation (72) Inventor Nori Yamamoto 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. Inside Denso Corporation (72) Inventor Masahisa Kaminishi 1-8-12 Miyamoto-cho, Kiryu-shi, Gunma Co., Ltd. Inside Atago Manufacturing Co., Ltd. (72) Inventor Noboru Otomo 1-8-12 Miyamotocho, Kiryu-shi, Gunma Inside Atago Manufacturing Co., Ltd.

Claims (5)

[Claims] 1. A heat exchanger in which an accumulator 20 is connected to both open ends of a tube formed in a flat plate shape to form one fluid passage, and the outer shape is formed in a short columnar shape at one open end of the accumulator 20. A heat exchanger characterized in that a predetermined amount of plug 26 is inserted into the plug 26 and airtightly joined. 2. The heat exchanger according to claim 1, wherein the plug body 26 is joined by brazing. 3. A ring wax 16 is formed on the side wall of the plug 26 in advance.
3. The heat exchanger according to claim 2, wherein the heat exchanger is wound at a predetermined position, and the plug 26 is fitted by bringing the ring wax 16 into contact with the end face of the accumulator 20. 4. The heat exchanger according to claim 1, wherein the tubes are formed by a tube row 12 in which a number of capillary tubes 10 are closely arranged. 5. The method according to claim 1, wherein one of the fluids is a refrigerant.
5. The heat exchanger according to 3 or 4.