JP4284726B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger that performs heat exchange between a first fluid that is a high-temperature gas flow and a second fluid that is a low-temperature gas flow.
[0002]
BACKGROUND OF THE INVENTION
The present inventors have devised the heat exchanger shown in the schematic diagram of FIG. 2 (not a known technique) as a heat exchanger for exchanging heat between the high temperature first fluid and the low temperature second fluid. The heat exchanger, the interior of the first fluid path A and the second fluid passage B, in which inclined position the multiple bent fin 2, and conventional heat exchanger (hot air stream shown in FIG. 7 -a and cross-flow heat exchanger for exchanging heat and the cold air flow flows perpendicular, countercurrent heat exchanging heat and a hot air flow and cold air flow flowing to face shown in FIG. 7 -b Compared with an exchanger etc.), low pressure loss and high heat exchange efficiency are realized.
[0003]
[Problems to be solved by the invention]
However, as the fin 2 of the heat exchanger devised by the present inventors, a thin plate material simply bent into a corrugated shape (without a slit or the like) is a fluid flow as shown in FIG. Has a problem that the pressure loss is large because it bends sharply (lower pressure loss than the conventional one).
[0005]
OBJECT OF THE INVENTION
The present invention has been made on the basis of the above circumstances, and further reduces the low pressure loss of a heat exchanger in which a plurality of fins bent in a wave shape are inclined in the first fluid passage and the second fluid passage, and The purpose is to improve efficiency.
[0006]
[Means for Solving the Problems]
[Means of Claim 1 ]
By using louver fins having ventilation holes and inclined surfaces for the fins inclined in the first fluid passage and the second fluid passage, the bending of the flow in the fluid passage becomes gentle. Fluid pressure loss can be suppressed.
[0008]
[Means of claim 2 ]
The fins that are inclinedly arranged inside the first fluid passage and the second fluid passage are divided into a plurality of pieces in one fluid passage, and each of the divided fins is arranged in one fluid passage. Arranged at different inclination angles. Further, among the divided fins, the fin on the inlet side close to the fluid passage inlet is inclined so that the fluid passage inner wall facing the fin outlet and the fin outlet spread.
By widening the fin outlet and the fluid passage inner wall and widening the fin outlet, the flow rate at the fluid passage inlet side increases, and as a result, the flow velocity distribution of the fluid passing through the fin can be made uniform, and the heat efficiency of the heat exchanger Can be increased.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described using a plurality of examples and modifications.
(Configuration of the first embodiment)
1 to 4 show the heat exchanger of the first embodiment, FIG. 1 is an explanatory diagram showing the flow of fluid, and FIG. 2 is a first fluid passage through which the first fluid flows and a second fluid through which the second fluid flows. FIG. 3 is a schematic view of the fluid passage, FIG. 3 is a perspective view of the main part of the fin, and FIG. 4 is an explanatory view showing the flow directions of the first fluid and the second fluid.
[0010]
The heat exchanger is formed of a metal material having excellent heat conductivity such as aluminum or brass, and a first fluid passage A (a high-temperature gas flow, for example, high-temperature air circulating in a sealed space) flows through the first fluid passage A ( 2) and a large number of second fluid passages B (see FIG. 2b) through which the second fluid (low-temperature gas flow, for example, outdoor air) flows are alternately arranged via the rectangular partition walls 1. It is a thing.
Specifically, each first fluid passage A and each second fluid passage B are provided in a cubic box shape that is long in the vertical direction, as shown in FIGS. .
[0011]
The first fluid passage A shown in this embodiment is provided with a first fluid inlet Ai at the rear of the upper surface and a first fluid outlet Ao at the front of the lower surface.
Similarly, the second fluid passage B shown in this embodiment is provided with a second fluid inlet Bi at the front of the lower surface and a second fluid outlet Bo at the rear of the upper surface.
[0012]
The fin 2 is disposed to be inclined with respect to the depth direction of the first and second fluid passages A and B. Specifically, the fin 2 is a thin plate whose fin length (width through which the fluid passes) is narrower than those of the first and second fluid passages A and B, and is a rectangular shape of the first and second fluid passages A and B. As shown in FIG. 2, they are arranged in a substantially diagonal direction, and are arranged in a state of being inclined forward in the same direction with respect to the longitudinal direction (vertical direction) of the first and second fluid passages A and B.
[0013]
The fin 2 is a louver fin shown in FIG. 3, and is provided with a large number of ventilation holes 3 through which fluid flows, and the first and second fluids flowing in the first and second fluid passages A and B are fins. It is possible to cross two .
[0014]
(Operation of the first embodiment)
When the first fluid flows in the first fluid passage A and the second fluid flows in the second fluid passage B, the first fluid and the second fluid are finned as shown in FIGS. At the time of passage of 2, they are opposed to each other and exchange heat through the fins 2 and the partition walls 1.
FIG. 1B shows the flow of the first fluid in each first fluid passage A at this time. Since the fins 2 arranged in each first fluid passage A are provided with a large number of ventilation holes 3, a fluid crossing the fins 2 is generated. For this reason, the bending of the first fluid in each first fluid passage A becomes gentle.
Similarly, in each second fluid passage B, the bending of the second fluid becomes gentle due to the large number of ventilation holes 3 provided in the fins 2.
[0015]
(Effects of the first embodiment)
In the heat exchanger of the present embodiment, as shown in the above-described operation, the fins 2 are provided with a large number of ventilation holes 3, and the bending of the fluid in each of the first and second fluid passages A and B becomes gentle. Therefore, the pressure loss of the first and second fluids flowing in the first and second fluid passages A and B is reduced, and as a result, the flow velocity is increased and the heat exchange efficiency is increased, and the load of a fan (not shown) is reduced. The
[0019]
( Second embodiment)
FIG. 5 is an explanatory view showing the flow of fluid in the fluid passage.
In this embodiment, the fin 2 is divided, and the divided fins 2A and 2B are arranged at different inclination angles, so that the flow velocity distribution passing through the fin 2 is made uniform.
[0021]
In an embodiment of this, the inclination angle of the split fins 2A of the divided fluid passage inlet in the side and small, is obtained by widening the fin outlet spread its fin outlet in fluid passage inner wall. Accordingly, the flow rate on the divided fin 2A side is increased, and as a result, the flow velocity distribution of the fluid passing through the fin 2 can be made uniform, and the heat efficiency of the heat exchanger can be increased.
[0022]
(Modification)
In the above embodiments, as shown in FIG. 6 (a), provided with a fluid passage inlet in the upper surface of the fluid passage, the example of providing a fluid passage outlet out to the lower surface of the fluid passage, Fig. 6 ( As shown in b) to (d), the positions of the fluid passage inlet in and the fluid passage outlet out may be changed.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the flow of a fluid (first embodiment).
FIG. 2 is a schematic perspective view showing first and second fluid passages (first embodiment).
FIG. 3 is a perspective view of a main part of a fin (first embodiment).
FIG. 4 is an explanatory view showing the flow directions of the first and second fluids (first embodiment).
FIG. 5 is an explanatory view showing the flow of fluid (second embodiment).
FIG. 6 is an explanatory view showing a flow of fluid (modified example).
FIG. 7 is a perspective view of a main part of the heat exchanger.
[Explanation of symbols]
A 1st fluid passage B 2nd fluid passage 1 Partition 2 Fin 3 Ventilation hole in Fluid passage inlet out Fluid passage outlet

Claims (2)

A first fluid that is high-temperature inside air that circulates in a sealed space and a second fluid that is low-temperature outdoor air flow adjacently, and the first fluid passes through a partition wall that separates the first fluid and the second fluid. And a heat exchanger for exchanging heat with the second fluid,
A first fluid side box in which a first fluid passage for flowing the first fluid from above to below is formed;
A second fluid side box in which a second fluid passage for flowing the second fluid from below to above is formed;
The first fluid passage and the second fluid passage are arranged in the same direction with respect to the depth direction and have fins that are bent in a number of undulations,
The fin has an inclined surface, and is a louver fin provided with a ventilation hole for allowing fluid to flow through the inclined surface.
A heat exchanger, wherein a second fluid inlet for allowing the second fluid to flow into the second fluid passage is formed on a lower surface of the second fluid side box . A first fluid that is high-temperature inside air that circulates in a sealed space and a second fluid that is low-temperature outdoor air flow adjacently, and the first fluid passes through a partition wall that separates the first fluid and the second fluid. And a heat exchanger for exchanging heat with the second fluid,
A first fluid side box in which a first fluid passage for flowing the first fluid from above to below is formed;
A second fluid side box in which a second fluid passage for flowing the second fluid from below to above is formed;
The first fluid passage and the second fluid passage are arranged in the same direction with respect to the depth direction and have fins that are bent in a number of undulations,
Wherein said fins in each fluid passageway while being arranged in a plurality, disposed at different tilt angles, respectively Re fins Waso divided arrangement,
Of the divided fins,
The fin on the inlet side near the fluid passage inlet is arranged so that the upper end of the air flow downstream portion of the fin is separated from the inner wall of the box facing the air flow downstream portion of the fin,
A heat exchanger, wherein a second fluid inlet for allowing the second fluid to flow into the second fluid passage is formed on a lower surface of the second fluid side box .

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