JPH0539318Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a heat exchanger used as an evaporator in a heating device, and more specifically, to a heat exchanger that is used as an evaporator in a heating device, and more specifically to a heat exchanger that uses combustion heat from an oil burner or a gas burner to transfer heat to a heat medium such as Freon. This invention relates to a heat exchanger used as an evaporator to evaporate.

In this specification, the terms "front and back" refer to the longitudinal direction of the combustion chamber main body, and the "front" refers to the direction shown by arrow A in FIG. 1, and the "rear" refers to the opposite side. Moreover, the upper and lower sides refer to the upper and lower sides of FIGS. 1 to 3. Furthermore, the left and right sides are referred to as facing backward.

Conventionally, as shown in FIG. 5, in this type of heat exchanger, a through hole 51 extending in the axial direction of the main body 50 is formed in the peripheral wall of a cylindrical combustion chamber main body 50 made of an extruded aluminum member in the circumferential direction. A plurality of hairpin-shaped heat medium distribution tubes 52 are formed at predetermined intervals, and the straight pipe portions of the plurality of hairpin-shaped heat medium distribution tubes 52 are inserted into adjacent through holes 51, and each hairpin-shaped heat medium distribution tube 52 is connected to a U-shaped connecting tube 53. A concatenated version was used.

Problems to be Solved by the Invention However, in the conventional heat exchanger described above, the flow path of the heat medium is connected to the bending part of the heat medium distribution pipe 52 and the connecting pipe 5.
3, each of which is bent into a U-shape, poses a problem of increased pressure loss. Another problem was that the area of the heat medium flow path was small.

Therefore, the present applicant first proposed a combustion chamber that has a cylindrical combustion chamber body and a plurality of heat medium flow passages therein, and that the heat medium flow passages extend in the circumferential direction or the axial direction of the combustion chamber body. We proposed a heat exchanger equipped with an arc-shaped flat tube tightly attached to the outer circumferential surface of the chamber body and headers brazed to both ends of the flat tube (Jitsuganesho
61-192206). Although this heat exchanger can solve the problems of the conventional heat exchanger described above, it has the following problems. In other words, it is necessary to braze the upper ends of the flat tubes on both sides of the combustion chamber body to separate headers, which increases the number of brazing parts and the number of brazing jigs. I have a feeling that the work will be troublesome.

The purpose of this invention is to provide a heat exchanger that solves all of the above problems.

Means for Solving the Problems The heat exchanger according to this invention has a combustion chamber main body and a plurality of heat medium flow passages extending in the circumferential direction of the combustion chamber main body, and has a top part on the outer surface of the combustion chamber main body. It is equipped with two flat tubes brazed to both sides, and the adjacent upper ends of both flat tubes are respectively bent upward and brought into contact with each other, and penetrate through the peripheral wall of one tubular header. It is inserted into the header and in this state is brazed to the header and also to each other.

Effects According to the heat exchanger of this invention, the upper ends of the flat tubes on both sides of the combustion chamber body are brazed to one header, so there are fewer brazing points, and Fewer brazing jigs are required.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings. In the following explanation, "aluminum"
The term shall include aluminum alloys as well as pure aluminum.

The heat exchanger 1 includes a combustion chamber main body 4 made of an aluminum brazing sheet, which is composed of a top wall portion 2 and left and right side walls 3 that are connected to the left and right side edges of the top wall portion 2 and extend downward, and is opened downward and is made of an aluminum brazing sheet. An aluminum lid 5 fixed to both the front and rear ends of the combustion chamber body 4 to close the front and rear openings of the combustion chamber body 4; and an aluminum corrugate disposed between the left and right side walls and brazed to the left and right side walls 3, respectively. fins 6, two aluminum flat tubes 7 having a large number of heat medium flow passages 8 inside and brazed to the outer surfaces of the left and right side wall portions 3 over almost the entire length thereof, and both flat tubes 7. It includes straight tubular inlet headers 9 made of aluminum that are brazed to the lower ends thereof, and outlet headers 10 that are straight tubular aluminum and are brazed to the upper ends of both flat tubes 7, respectively.

The top wall portion 2 of the combustion chamber main body 4 has an arcuate shape with a central portion protruding upward. The left and right side wall portions 3 are the top wall portion 2
an arcuate portion 11 that extends to the left and right edges of the top wall portion 2 and has the same radius of curvature as the top wall portion 2 and whose central portion protrudes outward; and a vertical portion that extends downward and connects to the lower edge of the arcuate portion 11. It consists of 12 and more. The top wall portion 2 and the arcuate portions 11 of the left and right side wall portions 3 are combined to form an occluded circular cross section. Further, an outer horizontal bent portion 13 is integrally provided at the lower edge of the vertical portion 12 . Top wall portion 2 in combustion chamber main body 4
The cross-sectional shape of the arcuate portions 11 of the left and right side walls 3 is not limited to a truncated circle, and may be, for example, a truncated square. Moreover, the cross-sectional shape of the combustion chamber main body 4 as a whole may be substantially inverted U-shaped. Both sides of the flat brazing sheet, which is the material for making the combustion chamber body 4, are immersed in a galvanizing bath without electricity to form an extremely thin zinc film, and then coated in the same galvanizing bath as above. It is preferable to form a galvanized layer by the electroplating method used. The galvanized layer diffuses into the aluminum due to the heating during the brazing process between the combustion chamber body 4 and the flat tube 7, the flat tube 7 and the headers 9 and 10, and the combustion chamber body 4 and the fin 6 for corrosion prevention. A zinc diffusion layer is formed.

An oil burner insertion opening 14 is formed in the lid 5 at the front end.

The corrugated fins 6 are arranged such that their flat portions lie on a vertical plane perpendicular to the front-rear direction.

The flat tube 7 has a heat medium flow path 8 that is connected to the top wall portion 2.
It is brazed to the combustion chamber body 4 in close contact with the outer surface of the left and right side walls 3 so as to extend in the circumferential direction of the arcuate portion 11 of the left and right side walls 3 . Further, the upper ends of both flat tubes 7 are respectively bent upward and brought into contact with each other. The lower ends of both flat tubes 7 are bent horizontally outward, and their tips are connected to headers 9, respectively. The upper end bent part is 15 and the lower end bent part is 1
6. Furthermore, among all the partition walls that partition adjacent heat medium flow passages 8 of the flat tube 7, a plurality of partition walls located at predetermined intervals in the front-rear direction are made thicker than the others ( (not shown). The flat tube 7 is produced by electroplating the surface of a straight extruded material by immersing it in a galvanizing bath without applying electricity to form an extremely thin zinc coating, and then electroplating using the same galvanizing bath as above. It is formed by forming a galvanized layer and then bending it. The galvanized layer is diffused into the aluminum by heating during the brazing process between the combustion chamber body 4 and the flat tube 7, between the flat tube 7 and the headers 9 and 10, and between the combustion chamber body 4 and the fins 6. , a zinc diffusion layer is formed for corrosion protection.

A long hole 17 extending in the axial direction and having a shape corresponding to the outer shape of the flat tube 7 is formed in the peripheral wall of the inlet side header 9. It is inserted into the header 9 and brazed to the peripheral wall of the header 9. Further, a heat medium inlet pipe 18 is connected to both inlet side headers 9, respectively.

A long hole 20 that extends in the axial direction and into which the bent upper ends 15 of both flat tubes 7 can be inserted is formed in the peripheral wall of the outlet header 10. Header 1 through long hole 20
0 and are brazed to the peripheral wall of the header 10 and also to each other. Further, a heat medium outlet pipe 21 is connected to the outlet side header 10.

Both headers 9 and 10 are formed from electric resistance welded tubes made of brazing sheets whose inner and outer surfaces are covered with an aluminum brazing material layer 22.

To connect the upper bent portion 15 of the flat tube 7 to the header 10, first connect the upper bent portion 15 to the header 10, as shown in FIG.
They are brought into contact with each other through a brazing material 23, and both upper end bent portions 15 are coated with an aluminum brazing material layer 22 on both inner and outer surfaces.
The header 10, which is formed from an electric resistance welded tube made of a brazing sheet covered with This is done by brazing.

FIG. 4 shows a heating device using the heat exchanger 1 as an evaporator.

The heating device uses, for example, Freon as a heat medium, and includes an indoor unit 26 and an outdoor unit 27. Indoor unit 2
6, a condenser 31 and a blower 32 are provided in a casing 30 having an air inlet 28 and an air outlet 29. heat exchanger 1
is arranged in the casing 33 of the outdoor unit 27, and the inlet header 9 and the outlet header of the condenser 31, and the outlet header 10 and the inlet header of the condenser 31 are connected to conduits 34 and 35, respectively.
connected with. Inside the casing 33 of the outdoor unit 27, a check valve 36 and a receiver 37 are provided in this order from the condenser 31 side in the middle of one conduit 34. A check valve 38 is provided in the middle of the other conduit 35 . heat exchanger 1
An oil burner 39 is inserted into the combustion chamber main body 4 through the burner insertion port 14, and the heat medium flowing in the flat tube 7 is heated and vaporized by the combustion heat of the burner 39. Further, the lower end opening of the combustion chamber main body 4 has a casing 33 at its tip.
An exhaust gas pipe (not shown) extending to the outside of the exhaust gas pipe is connected to the exhaust gas pipe, and the exhaust gas is discharged into the atmosphere through this exhaust gas pipe.

In such a configuration, the combustion gas of the oil burner 39 flows downward through the fins 6 between the left and right side wall portions 3. The heat medium flowing in the flow path 8 of the flat tube 7 is heated and vaporized by the combustion heat of the oil burner 39, and is sent to the condenser 31 through the conduit 35. Then, while passing through the condenser 31,
Heat is radiated to the indoor air sucked into the casing 30 through the suction port 28 by the blower 32, and the air is liquefied.
It is sent through a conduit 34 to the inlet header 9 of the heat exchanger 1. A condenser 31 inside the casing 30
The air that has removed heat from the heat medium passing through is blown into the room from the outlet 29, and the room is heated by this air.

In the above embodiment, the heat exchanger of this invention is applied to a heat exchanger using an oil burner, but it can also be applied to a heat exchanger using a gas burner. The shape of the combustion chamber body and flat tubes of a heat exchanger that uses a gas burner is different from the shape of the combustion chamber body and flat tubes of a heat exchanger that uses an oil burner, so the shape of the combustion chamber body and flat tubes should be set to the same shape. Let's make some changes as well.

Effects of the invention According to this invention, the upper ends of both flat tubes are bent upward and brought into contact with each other, and are inserted into the header through the peripheral wall of one tubular header. Since they are brazed to the header and to each other, there are fewer brazing locations and fewer brazing jigs. Therefore, the work becomes easier.
Moreover, the brazing between the combustion chamber main body material and the flat tube is reliably performed.

In addition, the heat exchanger of this invention has a combustion chamber main body,
It has a plurality of heat medium flow passages extending in the circumferential direction of the combustion chamber main body inside, and two flat tubes each brazed on both sides of the outer surface of the combustion chamber main body, sandwiching the top of the combustion chamber main body. The area of the heat medium flow path is much larger than that of the conventional one shown in FIG. Furthermore, since there are fewer bends in the flow path than in the conventional one shown in FIG. 5, pressure loss is reduced. Therefore, the heat exchange efficiency is improved compared to the conventional one shown in FIG.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the heat exchanger of this invention, Fig. 2 is an enlarged cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a connection between the bent portion of the upper end of the flat tube and the header. FIG. 4 is a schematic diagram showing a heating device using the heat exchanger of this invention.
FIG. 5 is a perspective view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Heat exchanger, 4... Combustion chamber main body, 7... Flat tube, 8... Heat medium flow path, 10... Outlet side header.

Claims (1)

[Scope of utility model registration request] The combustion chamber body includes a combustion chamber body, and two flat tubes each having a plurality of heat medium flow passages extending in the circumferential direction of the combustion chamber body, and each of which is brazed to both sides of the outer surface of the combustion chamber body with the top thereof sandwiched therebetween. The adjacent upper ends of both flat tubes are bent upward and brought into contact with each other, and are inserted into the header through the peripheral wall of one tubular header, and in this state are brazed to the header. The heat exchanger is also brazed to each other.