JPH08327271A - Heat exchanger - Google Patents

Abstract

PURPOSE: To provide a heat exchanger, in which a heat dissipating fin will never be collapsed and a heat transfer tube will never be buckled even when the heat transfer tube is bent. CONSTITUTION: In a heat exchanger, constituted of heat dissipating fins 1, provided in parallel with an interval between each other, and heat transfer tubes 2, penetrating the heat dissipating fins 1 and bent in the widthwise direction of the fins, the strength of the inside 1a of bending of the heat dissipating fans 1 is determined so as to be stronger than the strength of the outside 1b of bending.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly to a heat exchanger used in refrigeration equipment, air conditioners and the like.

[0002]

2. Description of the Related Art A partition plate heat exchanger allows a fluid to flow into a compartment completely partitioned by a flat plate or a tube so that fluids of different temperatures are brought into contact with the outside of the compartment, and the flat plate or the like is used to intervene between them. It conducts heat in the vertical direction to perform heat exchange from fluid to fluid, and is used in refrigeration equipment, air conditioners, and the like.

Conventionally, heat exchangers as shown in FIGS. 9 and 10 have been used.

As shown in FIG. 9, this heat exchanger has a large number of slits 3 to 8 (cut and raised) symmetrically arranged about a center O in the width direction so as to improve heat exchange efficiency. The heat radiation fins 1 and the heat transfer tubes 2 are arranged. The heat radiation fins 1 are arranged in parallel at a distance from each other, and the central portion thereof is penetrated by the heat transfer tubes 2.

Therefore, when a fluid (refrigerant) is introduced into the heat transfer tube 2 and another fluid (air) is brought into contact with the outside of the heat transfer tube 2 and the heat radiation fin 1, the heat of the fluid in the heat transfer tube 2 is released. Is conducted to the other fluid flowing through the radiation fin 1 to the outside, and heat is exchanged from the fluid to the fluid.

In addition, the heat exchanger shown in FIG. 10 is a stack of the heat exchangers of FIG. 9 arranged in two rows, and heat exchange is performed in the same manner.

[0007]

However, when the above-mentioned heat exchanger is bent in an L shape or the like, a strong load is applied to the inside of the curve, so that the radiation fins 1 on the inside of the curve are crushed in the width direction W thereof. There was a problem that the heat transfer tube 2 buckled due to the above. In addition, even when two heat exchangers are arranged in parallel to form one heat exchanger, when they are bent,
Similarly, the heat transfer tube 2 will buckle.

Therefore, an object of the present invention is to solve the above problems and to provide a heat exchanger in which the heat-radiating fins are not crushed and the heat-transfer tubes 2 do not buckle even when the heat-transfer tubes 2 are curved.

[0009]

In order to achieve the above-mentioned object, the present invention comprises heat dissipating fins arranged side by side with a space between each other and a heat transfer tube penetrating the heat dissipating fins, and the heat dissipating pipe extends in the fin width direction. In a heat exchanger having a curved heat transfer tube, the strength of the heat radiation fin inside the curve is made stronger than the strength outside the curve.

In order to impart this strength difference, the heat radiation fin may have a short slit on the inside of the curve and a long slit on the outside of the curve, or only the slit on the most inside of the heat radiation fin may be shortened. Furthermore, a slit having a narrow width on the inside of the curve on the radiation fin, a slit having a wide width on the outside of the curve, or a slit having only the slit on the innermost side of the curve may be narrowed. Further, a small number of slits may be arranged inside the curve of the heat radiation fin, and a large number of slits may be arranged outside the curve. Alternatively, a flat portion having no slit may be provided inside the curved portion of the heat radiation fin. The heat exchanger may be one in which the heat radiation fins and the heat transfer tubes are superposed in two rows and curved.

[0011]

According to the above structure, since the strength of the heat radiation fins inside the curve can be increased in advance, the heat radiation fins will not be crushed even if the heat radiation fins are bent, and the buckling of the heat transfer tube can be prevented. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, this heat exchanger has radiating fins 1 provided in parallel with each other at a predetermined interval.
And the heat transfer tube 2 penetrating the heat dissipation fin 1, and the heat transfer tube 2 is curved in the fin width direction.

Here, the heat radiation fins 1a on the inside of the curve are configured to have a higher strength than the heat radiation fins 1b on the outside of the curve. That is, as shown in FIG. 2, the radiating fin 1 is provided with three slits 21 to 26 on each of the left and right sides, but the size of each slit is the center in the width direction as in the conventional case. Slits 2 shorter than the slits 24, 25, and 26 on the outside 1b of the curve are formed in the inside 1a of the curve with the center O as a boundary, instead of the same length symmetrical about O.
1, 22, 23 are arranged.

That is, the length 23a of the slit 23 on the inside 1a of the curve arranged near the center O is shorter than the length 24b of the slit 24 on the outside 1b of the curve (23a <24b). Similarly, the length of the slit 22 is shorter than that of the slit 25, the length of the slit 21 is shorter than that of the slit 26, and the length of the slit is asymmetrical.

Therefore, the slits 24-2 of the curved outer side 1b
By providing the slits 21 to 23 shorter than 6 on the heat radiation fins on the curved inner side 1a, the areas between the slits can be made different and the strength of the heat radiation fins 1a on the curved inner side can be increased. Therefore, even if the heat-radiating fins 1 are bent, the heat-radiating fins 1 are not crushed and the buckling of the heat transfer tubes 2 can be prevented. In other words, in a heat exchanger provided with cut-and-raised parts to enhance the fin effect, the strength can be maintained without significantly impairing the heat exchange efficiency.

Next, another embodiment of the present invention will be described.

In the above embodiment, the length of the slit on the curved inner side 1a is shortened to increase the strength, but as shown in FIG. 3, the slits 34, 35, 3 on the curved outer side 1b are formed on the curved inner side 1a.
Slits 31, 32, 33 narrower than 6 may be provided. That is, the width of each slit is not symmetrical with respect to the center O in the width direction as in the prior art, but the heat dissipation fins 1 on the inner side of the curve are formed.
The width wa of the slits 31, 32, 33 arranged in a is
It is narrower than the width wb of the slits 34, 35, 36 on the curved outer side 1b (wa <wb). With this structure, the strength of the heat radiation fins on the curved inner side 1a is increased.

Further, as shown in FIG. 4, the number of slits on the curved inner side 1a may be smaller than the number of slits on the curved outer side 1b. That is, the number of each slit is not equal to the left and right with the center O as an axis as in the conventional case, but two slits 42 and 43 are provided on the inside 1a of the curve and three slits 44 and 45 on the outside 1b of the curve. , 46 to increase the strength of the radiation fin 1a on the inner side of the curve. Further, as shown in FIG. 5, the flat portion 57 may be provided by setting the number of slits arranged in the heat dissipation fin 1a on the inner side of the curve to 0. In this case, the strength can be maximized in the above-mentioned embodiment.

The present invention can also be applied to a heat exchanger in which two rows of heat exchangers are overlapped and curved as in the second embodiment shown in FIG. That is, as shown in FIG. 7, the slits 71 to 76 formed in the radiating fins 1A on the inner side of the curve are made shorter than the slits 77 to 82 of the radiating fins 1B on the outer side of the curve, with the overlapping boundary C as the center. The radiation fins 1A and 1B are provided with slits symmetrically arranged. Further, as shown in FIG. 8, a flat portion in which the number of slits in the curved inner side 1A is 0 may be provided around the boundary C to increase the strength of the radiating fin 1A inside the curved side.

In the above embodiment, the length or width of all slits on the inside of the curve is shortened or narrowed with the center O or the boundary C in the width direction as the boundary, but the object of the present invention is to bend the curve. Since the strength of the radiating fins on the inner side is increased, some of the slits on the inner side of the curve may be shortened or narrowed. For example, only the innermost curved slit may have a short length or a narrow width.

In the above embodiment, the slit length,
Although the width and the number are individually changed to increase the strength of the heat radiation fin on the inner side of the curve, the slit shape may be changed by combining these.

[0023]

In summary, according to the present invention, since the strength of the heat radiation fins on the inner side of the curve can be increased, the heat radiation fins will not be crushed even when the heat transfer tube is curved. Can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a front view showing a radiation fin of FIG.

FIG. 3 is a front view showing a radiation fin of another embodiment.

FIG. 4 is a front view showing a radiation fin of another embodiment.

FIG. 5 is a front view showing a radiation fin of another embodiment.

FIG. 6 is a perspective view showing a heat exchanger according to a second embodiment of the present invention.

FIG. 7 is a front view showing the heat dissipation fin of FIG.

FIG. 8 is a front view showing a radiation fin of another embodiment.

FIG. 9 is a front view showing a conventional heat exchanger.

FIG. 10 is a front view showing another conventional heat exchanger.

[Explanation of symbols]

 1 Radiating fin 1a Curved inside (radiating fin inside the curve) 1b Curved outside (radiating fin outside the curve) 2 Heat transfer tube

Claims (8)

[Claims] 1. A heat exchanger comprising heat dissipating fins arranged in parallel with each other at intervals and heat transfer tubes penetrating the heat dissipating fins, wherein the heat transfer tubes are curved in the fin width direction. A heat exchanger characterized in that the strength of the inside of the curve is made stronger than the strength of the outside of the curve. 2. The heat exchanger according to claim 1, wherein a short slit is arranged inside the curve of the heat radiation fin and a long slit is arranged outside the curve. 3. The heat exchanger according to claim 2, wherein only the innermost slit on the radiation fin is shortened. 4. The heat exchanger according to claim 1, wherein a slit having a narrow width is arranged inside the curved portion of the heat radiation fin, and a slit having a wide width is arranged outside the curved portion. 5. The heat exchanger according to claim 4, wherein only the innermost curved slit on the radiation fin is narrowed. 6. The heat exchanger according to claim 1, wherein a small number of slits are arranged on the inner side of the curve of the radiation fin and a large number of slits are arranged on the outer side of the curve. 7. A flat portion having no slit is provided inside the curved surface of the heat radiation fin.
The heat exchanger according to any one of 1. 8. The heat exchanger according to claim 1, wherein the heat radiation fins and the heat transfer tubes are superposed in two rows and curved.