KR100343474B1 - Heat exchanger - Google Patents

Abstract

(Problem) A plurality of fins F are arranged in the auxiliary body K at predetermined intervals, and a plurality of endothermic tubes H penetrating these fin groups F, F ... are substantially perpendicular to the flow of the combustion exhaust. In the heat exchanger, the heat exchanger provided by the combustion exhaust gas further promotes heat exchange at the rear side (downstream side of the exhaust stream) of the endothermic pipe H by combustion exhaust, thereby providing a heat exchanger which improves heat exchange efficiency and prevents the generation of drain.

(Solution means) An offset pin 12 extending in a direction perpendicular to the exhaust flow in the downstream region of the exhaust flow of the heat absorbing tube H in the fin F and extending to a position displaced from the heat absorbing tube H And the offset fin 12 is a plate-shaped portion formed by lancing from the fin F, positioned at an intermediate level between adjacent fins F and F, and downstream of the exhaust flow of the heat absorbing tube H. Is connected to and integrated with the pin (F).

Description

Heat exchanger {HEAT EXCHANGER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, particularly a heat exchanger of a type in which a plurality of fins are arranged at predetermined intervals, accommodated in a subsidiary body, and a plurality of endothermic tubes are passed therethrough.

Many heat exchangers of this kind are employed in heat exchangers such as hot water heaters. For example, as disclosed in Japanese Patent Laid-Open No. 7-127911, as shown in Figs. 4 and 5, the rectangular tubular auxiliary body K is shown. The plurality of fins F are built in the upper half of the plurality of fins F at predetermined intervals, and a plurality of heat absorbing tubes H are provided to penetrate the plurality of fins F (hereinafter referred to as fin groups F and F…). After that, these are connected so as to be connected in series, and a combustion device such as a gas burner B is built in the lower portion of the subsidiary body K, i.e., below the fin group F, F ....

In the heat exchanger, the fin F is heated by the combustion exhaust of the combustion device, and the heat is heat-exchanged with the heated water flowing in the endothermic tube H. Therefore, the heated water rises to a predetermined appropriate temperature while flowing from one end of the series path of the heat absorbing tube H connected in series to the other end.

Since the flow of the combustion exhaust is concentrated in the secondary body K, there is no problem of the efficiency deterioration in which the combustion exhaust is diffused in the fin groups F, F ..., but the exhaust stream flowing along the fin groups F, F ... is deflected ( Iii) heat exchange loss occurs. For example, the exhaust stream flowing along the inner wall of the subsidiary body K is hardly absorbed by the heat absorbing tube H. In addition, since the upper side of the endothermic tube H becomes the downstream side of the exhaust flow, it becomes a blind spot and exhaust gas is less likely to flow into the upper side of the endothermic tube H, so that the endothermic action of the fin in this portion is insufficient. do.

Therefore, in the heat exchanger of the prior art, exhaust flows to the inside of the subsidiary body K at a portion corresponding to the upper end of the fin groups F, F ... on the upper side of the opposing wall surface of the subsidiary body K. The guide plate 1 which guides is provided, and the heat exchange loss by the combustion exhaust which rises along the auxiliary body K is eliminated.

In the middle of the heat absorbing pipes H and H arranged in the horizontal direction, a guide protrusion 11 such as a disk-shaped protrusion or a burring hole is formed in the fin F, and adjacent fins F, The guide convex part 11 is interposed between F). As a result, the combustion exhaust flowing in the middle of the heat absorbing tubes H and H adjacent to each other in the horizontal direction is guided to the rear side of the heat absorbing tube H, so that the combustion exhaust passing through the middle is left to the exhaust side of the subsidiary body K. The upper portion of the heat absorbing tube H in the fin F is heated without passing. This improves heat exchange efficiency.

As described above, the heat exchanger of the prior art improves the heat exchange efficiency by two measures, but the present invention further provides heat exchange at the rear side (downstream side of the exhaust stream) of the endothermic tube H by combustion exhaust. As a subject to promote, specifically, a plurality of fins F are arranged in the auxiliary body K at predetermined intervals, and a plurality of endothermic tubes H penetrating these fin groups F, F ... are burned. In a heat exchanger provided in a direction substantially perpendicular to the flow of exhaust gas, the endothermic heat amount due to heat exchange between the exhaust stream passing through the side of the endothermic tube H and the fins F is efficiently at the rear side of the endothermic tube H. The object of the present invention is to improve the heat exchange efficiency by being delivered to the substrate.

1 is a cross-sectional view showing an example of a heat exchanger according to an embodiment of the present invention.

2 is a plan view of main parts of the pin F;

3 is an explanatory view of principal parts of a section III-III in FIG. 1;

4 is an explanatory diagram of a conventional example

5 is an explanatory view of principal parts of a section V-V of FIG. 4;

Explanation of symbols for main parts of the drawings

F: Fin H: Endothermic Tube

1: guide plate 11: guide convex portion

12: offset pin 13: cutout

14: coupling portion 121: auxiliary offset pin

Solution to Problem The present invention, which has been devised in order to solve the above-mentioned problems, has a plurality of heat absorbing tubes (P) arranged in the sub-base (K) at predetermined intervals and penetrating these fin groups (F, F ...). A heat exchanger in which H) is disposed in a direction substantially perpendicular to the flow of combustion exhaust, comprising: a first heat absorbing portion in which a plurality of heat absorbing tubes (H) are provided upstream of an exhaust stream in the fin groups (F, F ...); A second heat absorbing portion including a plurality of heat absorbing tubes (H) disposed downstream of the exhaust stream is formed, and at the lower end of the fin (F), a cutout portion between adjacent heat absorbing tubes (H, H) of the first heat absorbing portion ( 13), the fin (F) is coupled to the downstream region of the exhaust stream of the heat absorbing tube (H), perpendicular to the exhaust flow and extends to a position displaced from the heat absorbing tube (H) A plate-shaped portion formed by lancing in (F), which is located at an intermediate level between adjacent fins (F, F) and is exhausted from the heat absorbing tube (H). In the downstream region, an offset fin 12 is formed which is connected to and integrated with the fin F, and is located upstream in the flow of the exhaust stream with respect to the offset fin 12, and adjacent to the endothermic pipes H and H. ), Or between the heat absorbing tube (H) and the subsidiary body (K), a secondary offset pin (121) having a narrower width than the offset pin (12) is formed.

The solution works as follows.

The offset pin 12 is formed by lancing a predetermined range of the fin F, the end of which is integrally coupled with the fin F. And plate-shaped parts other than the said engaging part of this offset fin 12 are located in the middle between adjacent fins F and F, and are arranged between two heat absorbing pipes H and H which are parallel to the exhaust stream. Located.

Therefore, the exhaust stream flowing between the heat absorbing tube H and the heat absorbing tube H heats the fin F portion located between them and simultaneously heats the offset fin 12. Then, the amount of heat absorbed by the offset fin 12 is transmitted to the rear side (the blind spot side in the flow of the exhaust stream) or near the end of the heat absorbing tube H in the fin F through the coupling portion. .

As described above, the exhaust stream flowing to the side of the heat absorbing tube H stops the boundary layer formed on the surface of the fin F at the portion where the offset fin 12 is formed, and newly forms the boundary layer at the upstream end of the offset fin 12. do. Therefore, an increase in endothermic amount (called a leading edge effect) at the upstream end of the offset fin 12, or a decrease in heat exchange efficiency due to the boundary layer being formed continuously along the surface of the fin F Is prevented by the presence of the offset pin 12, so that the heat absorbing amount in the heat absorbing tube H is increased.

Moreover, the rear part of the heat absorbing tube H or its adjacent part which the temperature of the fin F was hard to raise so far is heated by conducting the heat absorbed by the said offset fin 12 through the coupling part. Therefore, the rear part or the adjacent part of the heat absorbing tube H is kept at a higher temperature than that according to the prior art.

In addition, the offset fin 12 may be formed in the middle of the adjacent heat absorbing tubes H and H, and may be formed between the heat absorbing tube H and the side wall of the auxiliary body K. FIG. In the former case, both ends of the offset fin 12, that is, the engaging portion coupled to the fin F, are located at the rear side or the vicinity of the heat absorbing tube H, and the plate-shaped portion lifted from the fin F is adjacent to the fin. It is located in the middle between (F, F). In the latter case, the edge part at the side of the subsidiary body K in the said offset pin 12 may be in an excited state, without engaging with the pin F. As shown in FIG.

The offset pin 12 is located on the upstream side of the flow of the exhaust stream with respect to the offset fin 12, and between the heat absorbing tubes H and H adjacent to each other, or between the heat absorbing tubes H and the auxiliary body K. An auxiliary offset pin 121 having a width smaller than that of 12 is formed.

In the heat exchanger configured as described above, the endothermic action is also promoted by the auxiliary offset fin 121 formed upstream of the offset fin 12, and the heat absorbing heat absorbed by the auxiliary offset fin 121 is endothermic tube (H). It is conducted to the heated water in the heat absorbing tube (H) through the adjacent coupling portion. In addition, since the horizontal width (length in the direction orthogonal to the exhaust flow) of the auxiliary offset pin 121 is smaller than the horizontal width of the offset pin 12, the auxiliary offset pin 121 is an offset pin ( The offset pin 12 and the exhaust stream are sufficiently in contact with each other since the exhaust stream reaching 12 is not significantly disturbed. Therefore, as the auxiliary offset pin 121 is added, the heat exchange efficiency is further improved.

On the other hand, this invention is the 1st heat absorption part which provided the some heat absorbing pipe H in the upstream of the exhaust stream in fin group F, F ..., and the some heat absorbing pipe H in the downstream of exhaust stream. A second heat absorbing portion having a sidewall, and a cutout portion 13 is formed at the lower end of the fin F between the heat absorbing tubes H and H adjacent to the first heat absorbing portion, and the heat absorbing tube of the second heat absorbing portion is formed. (H) is located downstream of the middle of the heat absorbing tubes (H, H) adjacent to the first heat absorbing portion, and the offset fin 12 or the offset pin 12 and the auxiliary offset pin 121 are disposed only in the second heat absorbing portion. ) Will be provided.

In the heat exchanger comprised in this way, since the heat exchange effect in a 1st heat absorption part also arises, thermal efficiency improves. In the state which secured this effect, since the temperature of the rear part of the heat absorption tube H in a 2nd heat absorption part is maintained high, drainage prevention can also be attained.

In addition, since the notch 13 is formed between the heat absorbing tubes H and H in the first heat absorbing portion, the phenomenon that the temperature at the second heat absorbing portion is lowered due to excessive heat absorption at the first heat absorbing portion does not occur. In this respect, the prevention of the drain is further ensured.

Embodiment

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which concerns on this invention is described based on attached drawing.

In the present embodiment, the fin F shown in Figs. 1 and 2 is arranged on the upper part of the auxiliary body K at predetermined intervals as shown in Fig. 3, and the fin group F, F ... is shown below. Combustion apparatus such as gas burner which does not have. In addition, an exhaust pipe (not shown) is connected to the downstream side of the subsidiary body K.

In this embodiment, four heat absorbing pipes H are provided in the vicinity of the lower end of the fin group F, F ..., and these constitute the above-mentioned first heat absorbing portion. Three heat absorbing pipes H are provided at an upper portion of the fin groups F, F ..., and these constitute a second heat absorbing portion. Each heat absorbing tube H of the said 2nd heat absorbing part is arrange | positioned above the middle of each heat absorbing tube H which comprises the said 1st heat absorbing part.

Between each heat absorption tube H of the said 1st heat absorption part, the notch part 13 cut out to the upper area | region of these heat absorption tube H is formed.

The downstream region located downstream from the middle portion between the heat absorbing tubes H of the second heat absorbing portion, and the downstream portion positioned downstream from the middle portion between the heat absorbing tube H and the inner wall of the subsidiary body K. In the side region, an offset pin 12 and an auxiliary offset pin 121 are disposed on the center line of each heat absorbing tube H constituting the first heat absorbing portion, respectively.

These offset pins 12 and the auxiliary offset pins 121 are all formed by lancing at the pins F, as shown in FIG. 2, and the coupling portions 14 and 14 engaged with the pins F at both ends. Is formed so as to be inclined obliquely at both ends of the plate-shaped portion connecting them.

The upper and lower ends of the lower auxiliary offset pins 121 formed by the lancing are separated from the pins F, but the upper and lower widths of which the left and right ends are connected to the pins F by the coupling part 14 It is a fixed plate-shaped part, and the lancing height of this auxiliary offset pin 121 is set to about half of the space | interval between adjacent pins F and F. As shown in FIG. Moreover, the lower end part of the said auxiliary offset pin 121 is matched on the center line of each heat absorption tube H which comprises a 2nd heat absorption part. In the present embodiment, the upper and lower widths of the auxiliary offset pins 121 are set to about one third of the diameter of the heat absorbing tube H constituting the second heat absorbing portion.

The upper offset fin 12 is disposed to be offset from the downstream side of each heat absorbing tube H constituting the second heat absorbing portion, and is formed by lancing in the fin F in the same manner as the auxiliary offset fin 121, and has an upper and lower width. Is set to the same width as the auxiliary offset pin 121.

The left and right lengths of the offset pin 12 are set to about two times the left and right lengths of the auxiliary offset pin 121, and the coupling parts 14 and 14 coupled to the pins F at both ends are second. It is located in the downstream of the left and right edge part in the cross section of the heat absorbing tube H of a heat absorbing part, respectively. The left and right centers of the offset pins 12 coincide with the left and right centers of the subsidiary offset pins 121.

The heat exchanger of the above-described type is usually connected so that each heat absorbing tube H constituting the first heat absorbing portion and the second heat absorbing portion is connected in series, and the first heat absorbing portion and the second heat absorbing portion are connected in series. Connected. Then, when the combustion apparatus (not shown) passes through the first heat absorbing portion and the second heat absorbing portion in a state of combustion, blood in each heat absorbing tube (H) in the fin group (F, F ...) heated by the combustion exhaust is discharged. By heat-exchanging with heated water, the hot water to be heated is discharged through a tap provided in a kitchen or the like.

At this time, thermal efficiency is sufficiently secured by the endothermic action of the offset pin 12 and the auxiliary offset pin 121 as described above. Moreover, since the notch 13 is formed between each heat absorbing tube H of a 1st heat absorbing part, the heat absorbing area in the said 1st heat absorbing part which contacts the upstream part of combustion exhaust becomes small, and this part becomes small. The heat exchange action at is suppressed. Therefore, since the combustion exhaust which reached | attained the 2nd heat absorption part side does not become excessively low, the temperature of the heat absorption pipe H rear side of this 2nd heat absorption part does not fall excessively. In addition, since the heat absorbed by the offset pin 12 is conducted to the rear side of the heat absorbing tube H of the second heat absorbing portion through the coupling portion 14, the temperature of this portion is the action of the offset pin 12. Also tends to be maintained at a high temperature. For this reason, it is possible to prevent the occurrence of the drain which is frequently generated on the rear side of the heat absorbing tube H in the second heat absorbing portion.

Since the offset fin 12 has the effect of raising the temperature of the heat absorbing tube H rear side by itself, even if the embodiment adds only the configuration of the offset fin 12 according to the conditions, the improvement of the thermal efficiency and The prevention effect of the drain can be achieved.

In the above embodiment, the case where the exhaust stream flows from the lower side to the upper side is exemplified, but the combustion exhaust flows in any direction.

With respect to the offset pin 12 formed between the heat absorbing tube H and the side wall of the subsidiary body K, when the end of the side of the subsidiary body K is not engaged with the fin F, the offset pin 12 Since the absorbed heat becomes less likely to be conducted to the subsidiary body K, the subsidiary body K can be prevented from being heated.

The present invention has the above-described configuration and has the following unique effects.

The heat exchange efficiency due to the offset fins and the effect of thinning the boundary layer occurring on the surface of the fins as a whole improves the heat exchange efficiency compared to the above-described prior art.

In addition, since the surface temperature of the rear end portion of the heat absorbing tube or the portion near the end of the heat absorbing tube where the temperature has been difficult to rise up to now is maintained at a higher temperature than that according to the prior art by the conduction heat from the offset fin, the rear portion of the heat absorbing tube. Condensation in the can be prevented, and the drain is hardly generated.

Claims (3)

The plurality of fins F are arranged in the subsidiary body K at predetermined intervals, and the plurality of endothermic tubes H passing through the fin groups F, F ... are arranged in a direction substantially perpendicular to the flow of the combustion exhaust. In the heat exchanger, A first heat absorbing portion in which a plurality of heat absorbing pipes H are arranged in an upstream side of the exhaust stream in the fin group F, F ..., and a second heat absorbing pipe in which a plurality of heat absorbing pipes H are provided in a downstream side of the exhaust stream. Form wealth, At the lower end of the fin F, cutouts 13 are formed between the heat absorbing tubes H and H adjacent to the first heat absorbing portion, respectively. The fin F is coupled to the downstream region of the exhaust stream of the heat absorbing tube H, extends to a position perpendicular to the exhaust flow and deviated from the heat absorbing tube H, and lancing in the fin F. The formed plate-shaped portion, which is located at an intermediate level between adjacent fins (F, F) and is connected to and integrated with the fins (F) in the downstream region of the exhaust stream of the heat absorbing tube (H), Forming, The offset pin 12 is located on the upstream side in the flow of the exhaust stream with respect to the offset fin 12 and between the heat absorbing tubes H and H adjacent to each other, or between the heat absorbing tubes H and the auxiliary body K. Heat exchanger characterized in that the auxiliary width fin 121 is formed narrower than the width. delete delete