CN1322288C

CN1322288C - Heat exchanger

Info

Publication number: CN1322288C
Application number: CNB200510078507XA
Authority: CN
Inventors: 北野龙儿
Original assignee: Toshiba Carrier Corp
Current assignee: Toshiba Carrier Corp
Priority date: 2004-06-03
Filing date: 2005-06-03
Publication date: 2007-06-20
Anticipated expiration: 2025-06-03
Also published as: JP2005345021A; JP4549106B2; CN1704698A

Abstract

The heat exchanger is of a fin tube type, three or more rows of heat-transfer pipes are disposed in the direction of heat exchange air flow, a plurality of cut and erected slits are disposed between the heat-transfer pipes, and three cut and erected slits erected from one side are disposed between the heat-transfer pipes in the most upwind side. The height H<SB>1</SB>of the cut and erected slits on the upwind side and downwind side, of the three slits, is set at 0.6P < H<SB>1</SB>< 0.8P where P is a fin pitch, and the height H<SB>2</SB>of the center slit is set at H<SB>2</SB>< 0.6P. Thus, the heat exchanger is capable of suppressing rotation speed of a fan by reducing draft resistance and reducing power consumption.

Description

Heat exchanger

Technical field

The present invention relates to heat exchanger, especially relate to the fin tube heat exchanger (fin-tube type heat-exchanger) of having improved the radiating fin shape.

Background technology

Be extensive use of following heat converter structure in the past, promptly, be located at the indoor heat converter of fin-and-tube type of the indoor set of air conditioner, be set up in parallel and have the spacing (pitch) of regulation, heat-transfer pipe is provided with 1 row or 2 row with the form that connects the multi-disc radiating fin (fin) of circulation heat exchange air in the mutual gap along the heat exchange airflow direction, between the adjacent heat-transfer pipe of in each row, arranging, on described radiating fin, form a plurality of having cut simultaneously.

In such fin-and-tube type indoor heat converter, in recent years, for example, open shown in 2001-90977 communique and the Te Kai 2004-19999 communique as the Japan Patent spy, in order to improve performance, there is columns to increase to the above trend of 3 row with the part of heat exchanger or whole heat-transfer pipe.

But, a simple columns that increases heat-transfer pipe, the flowing resistance of heat exchanger also increases, and causes air quantity to descend, thus need add the rotating speed of big fan (fan) in order to ensure required air quantity, its result, existence consumption electric power increases, the problem of decrease in efficiency.

That is, as shown in Figure 7, the past more downstream of temperature difference of inflow air themperature and the heat-transfer pipe temperature of each row of heat-transfer pipe is more little, especially in the later said temperature difference of the 3rd row little trend is arranged, and this trend is more remarkable under the little situation of wind speed (air quantity).The increase that this means the heat exchange amount that the columns increase of heat-transfer pipe causes not is very big, and the later heat-transfer pipe of the 3rd row fails effectively to be utilized.

In addition, Fig. 8 (a) is illustrated between the adjacent heat-transfer pipe of arranging in the heat-transfer pipe row, the number of having cut that forms on the fin and the correlation of heat transfer coefficient, and the number increase of as seen having cut then heat transfer coefficient also increases.Having cut between each adjacent heat-transfer pipe usually forms more than 4 mostly.But shown in Fig. 8 (b), when the number increase of having cut, then flowing resistance also increases, and along with the increase of having cut number, the trend of its increase is remarkable, and heat exchanger effectiveness descends.

Summary of the invention

The present invention makes in order to address the above problem, and its purpose is, provides a kind of can the inhibition to cause the increase of flowing resistance, the heat exchanger of raising heat exchanger effectiveness along with the increase of heat-transfer pipe row.

In order to achieve the above object, heat exchanger of the present invention comprises: the multi-disc radiating fin that is set up in parallel and has the spacing of regulation, heat exchange air is circulated; Be arranged to connect these radiating fins, the heat-transfer pipe of inner conducting heat exchange medium, described heat-transfer pipe is provided with more than 3 row along the heat exchange airflow direction, between the adjacent heat-transfer pipe of arranging at least 1 row except that the row of upstream side in these heat-transfer pipes row, forming having cut more than 4 on the described radiating fin, it is characterized in that, between the adjacent heat-transfer pipe of arranging in the row of upstream side, forming 3 at described radiating fin upper edge heat exchange airflow direction has cut, when with spacing of fin (fin pitch) when being made as P, these 3 in having cut upstream side and the height H of having cut 1 in downstream provide by the such relational expression of 0.6P＜H1＜0.8P, the height H of having cut 2 that is positioned at central authorities is provided by the such relational expression of H2＜0.6P.

According to heat exchanger of the present invention, can suppress to cause the increase of flowing resistance along with the increase of heat-transfer pipe row, improve heat exchanger effectiveness.

Description of drawings

Fig. 1 is the stereogram of expression heat exchanger of the present invention.

Fig. 2 (a) is the vertical view of having cut group of the upstream side of the wind that forms on the fin of heat exchanger of the present invention, (b) is side view.

Fig. 3 is having cut highly with respect to the ratio of spacing of fin and the relevant line chart of heat transfer coefficient of expression heat exchanger of the present invention.

Fig. 4 (a) has been to use the relevant line chart of wind speed and heat transfer coefficient under the heat-transfer pipe 1 row situation of heat exchanger of the present invention, (b) is the expression wind speed and the relevant line chart of flowing resistance coefficient.

Fig. 5 (a) has been to use the relevant line chart of wind speed and heat transfer coefficient under the heat-transfer pipe 3 row situations of heat exchanger of the present invention, (b) is the expression wind speed and the relevant line chart of flowing resistance coefficient.

Fig. 6 is the concept map of the heat exchanger of expression embodiments of the invention 2.

Fig. 7 is the general heat-transfer pipe columns of expression and, inflow air themperature and the temperature difference of heat-transfer pipe temperature and the relevant line chart of flowing resistance.

Fig. 8 (a) represents the general relevant line chart of counting with heat transfer coefficient of having cut, and (b) is that the relevant line chart of counting with the flowing resistance coefficient has been cut in expression.

The specific embodiment

Below, with reference to accompanying drawing embodiments of the invention 1 are described.

Fig. 1 is the concept map of the heat exchanger of expression embodiments of the invention 1.

As shown in Figure 1, the heat exchanger 1 of embodiment 1 comprises: the multi-disc radiating fin 2 that is set up in parallel and has the spacing P of regulation, heat exchange air is circulated; Be arranged to connect the heat-transfer pipe 3 of these radiating fins 2, inner conducting heat exchange medium.Arrow is represented flowing of wind among the figure.Radiating fin 2 is divided into the group of the big radiating fin 22 of the group of the narrow radiating fin 21 of the width that is configured in the wind upstream side and width, the winding near-earth configuration of the group of these radiating fins 21 and radiating fin 22.Radiating fin both can be divided by the row of each heat-transfer pipe, also the multiple row heat-transfer pipe can be set up in parallel on one group of radiating fin.

Heat-transfer pipe 3 by 3 row more than for example 3 biographies heat pipes 31,32,33 constitute, the heat-transfer pipe 31 of upstream side connects fin lining ring (fin collar) 21a, can rabbet with one group of radiating fin 21 with conducting heat, the heat-transfer pipe 32 of central authorities and the heat-transfer pipe in downstream 33 connect fin lining ring 22a, can rabbet with other group of radiating fin 22 with conducting heat.

And, between the heat-transfer pipe of the adjacency in the row of heat-transfer pipe 31, form a plurality of group 21G that cut on the radiating fin 21.Between the heat-transfer pipe of the adjacency in the row of heat-transfer pipe 32, and the heat-transfer pipe of adjacency in the row of heat-transfer pipe 33 between, also form a plurality of having cut on the radiating fin 22 respectively and organize 22G, 23G.

Cut group 21G and cut by 3 and constitute, cut and organized 22G and cut by 4 and constitute, and, cut and organized 23G and cut by 3 and constitute.But, having cut group 23G also can be made of having cut more than 4.

Shown in Fig. 2 (a) and (b), 3 of group 21G of having cut of upstream side have cut among 21s1,21s2, the 21s3, the height H of having cut 21s1,2,1s3 1 in upstream side and downstream is when being made as P with spacing of fin, form 0.6P＜H1＜0.8P, simultaneously, Zhong Yang the height H of having cut 2,1s2 2 forms H2＜0.6P.The height of having cut 21s1,21s3 also can be different mutually in above-mentioned number range.

Cut group 23G and both can organize the identical shape of 21G, also different shapes with having cut.

Find from a large amount of result of the tests that present inventors carried out, cut 21s1 for 3,21s2,21s3, its characteristic has nothing in common with each other, the 21s1 that cut of upstream side has the effect of on every side concentrating of air-flow towards heat-transfer pipe 31, influence to heat transfer and flowing resistance is big, the 21s2 that cut of central authorities has the effect that prevents that heat-transfer pipe 31 air-flow on every side from departing from, influence to heat transfer is moderate, influence to flowing resistance is less, and the 21s3 that cut in downstream has the effect of on every side concentrating of air-flow towards heat-transfer pipe 31, little to the influence of conducting heat, be moderate to the influence of flowing resistance.

In addition, having cut that height confirms as with respect to the relation of the ratio of spacing of fin and heat transfer coefficient is relation shown in Figure 3.

According to this result of the test, 21s1,21s3 have been cut in upstream side and downstream, for heat transfer, the effect of the rising portions of having cut is bigger than the effect of the par of having cut, it is important how air-flow being concentrated around heat-transfer pipe 31, the present invention by improving the height of having cut with the one-sided structure of having cut, can concentrate air-flow like that around heat-transfer pipe.

In addition, the height of also cutting the par by increase reduces flowing resistance.But, when cut height H 1＞0.8P, when being H1/P＞0.8, the boundary layer of par hinders effect and also reduces greatly.

That finds central authorities has cut 21s2 for heat transfer, because boundary layer obstruction effect is big, so preferably its height H 2 is made the roughly height of half that the boundary layer hinders the spacing P of effect maximum.

Thus, make 0.6P＜H1＜0.8P, simultaneously the height H of having cut 2,1s2 2 of centre is set at the roughly height of half of spacing P, then can suppress the decline of heat transfer coefficient, can reduce flowing resistance simultaneously if will cut the height H 1 of 21s1,21s3.

And from the result of the test that present inventors carry out, the heat transfer coefficient under Fig. 4 (a) expression heat-transfer pipe 1 row situation, Fig. 4 (b) are the flowing resistance coefficients under the expression heat-transfer pipe 1 row situation.

Solid line is that to have cut be 4 situation, and dotted line is the situation of fin row of the upstream side of embodiment 1.The situation of embodiment 1 is that 4 situation is compared with having cut, and find that the decline of heat transfer coefficient is small, but flowing resistance reduces significantly.

In addition, Fig. 5 (a) is the heat transfer coefficient under the heat-transfer pipe 3 row situations, and Fig. 5 (b) is the flowing resistance under the heat-transfer pipe 3 row situations.Among the figure, solid line represents that having cut of each row is 4 situation, and dotted line is represented the situation of embodiment 1.

From the structure shown in Fig. 4 (a) and Fig. 5 (a) as seen, form the structure of the embodiment 1 that has cut under the form that the flowing resistance that upstream side is listed as reduces, heat transfer coefficient under upstream side 1 row descends a little, but the amount that its heat exchange descends is remedied by the downstream row, so the heat transfer coefficient under the heat exchanger integral body of 3 row is equal with the situation of having cut of each row being made 4.By contrast, from Fig. 4 (b) and Fig. 5 (b) as seen, the flowing resistance of the heat exchanger integral body of embodiment 1 reduces.

Shown in above-mentioned embodiment 1, when spacing of fin is made as P, the upstream side during 3 cut and the height H of having cut 1 in downstream are made 0.6P＜H1＜0.8P, simultaneously the height H of having cut 2 of central authorities is made H2＜0.6P, thereby by the raising of having cut the realization heat transfer of upstream side and reducing of flowing resistance, by improving the boundary layer obstruction effect that central authorities have cut, can suppress the decline of heat transfer coefficient, reduce the flowing resistance of heat exchanger integral body simultaneously.

Therefore,, can suppress the rotating speed of fan, reduce consuming electric power, raise the efficiency according to the heat exchanger of embodiment 1.

Heat exchanger to embodiments of the invention 2 describes below.

Embodiment 2 makes the width of respectively having cut of the foregoing description 1 have the situation of particular kind of relationship.

For example, as shown in Figure 6, the heat exchanger 1 of embodiment 2, upstream side cut 3 of group 21G cut width W 2 among 21s1,21s2, the 21s3, that 21s2 has cut in central authorities form than upstream side cut the width W 1 of 21s1 and width W 3 that 21s3a has been cut in the downstream big.Thus, by central authorities cut 21s2 characteristic, suppressing can to improve heat transfer efficiency when flowing resistance increases.

In addition, the substantial middle punishment that 21s3a is preferably in 31 of heat-transfer pipes of having cut in downstream is cut.Thus, can make the wind speed homogenising of the air-flow of side row towards downstream, improve the heat transfer property of downstream row.

And the interval m1 that is preferably made between having cut than other apart from m2 that the downstream side of 21s3a and fin downstream side have been cut in the downstream is big.Thus, can improve the drainage of the condensed water that generates in the cold-producing medium evaporation process, reduce flowing resistance, improve the heat transfer property in downstream.

In the various embodiments described above, the columns that has adopted heat-transfer pipe is that the example of 3 row is illustrated, but can be applicable to that also the columns of heat-transfer pipe is the above heat exchangers of 4 row.

Claims

1. heat exchanger comprises:

The multi-disc radiating fin that is set up in parallel and has the spacing of regulation, heat exchange air is circulated;

Be arranged to connect the heat-transfer pipe of these radiating fins, inner conducting heat exchange medium,

Described heat-transfer pipe is provided with more than 3 row along the heat exchange airflow direction, between the adjacent heat-transfer pipe of arranging at least 1 row the row that remove upstream side in these heat-transfer pipes row,, it is characterized in that formation having cut more than 4 on the described radiating fin,

Between the adjacent heat-transfer pipe of arranging in the row of upstream side, form 3 at described radiating fin upper edge heat exchange airflow direction and cut,

When spacing of fin is made as P, these 3 in having cut upstream side and the height H of having cut 1 in downstream,

Relational expression by 0.6P＜H1＜0.8P provides,

Be positioned at the height H of having cut 2 of central authorities,

Relational expression by H2＜0.6P provides.

2. heat exchanger as claimed in claim 1 is characterized in that, the width of having cut that is positioned at described central authorities than described upstream side cut and the width of having cut in downstream big.