JPH04240364A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide a heat exchanger which can prevent a problem of a dew scattering from a diffuser of an air conditioner due to a dew-condensation of moisture on the surface of a fan disposed at the rear of the exchanger even under a high moisture condition in the exchanger in which refrigerant is evaporated therein in a refrigerating cycle of an air conditioner. CONSTITUTION:Circuits for sequentially feeding refrigerant in each row from a header 25 to a header 28 arranged in one row of a heat exchanger, a header 29 for connecting the rows therebetween, and from a header 30 to a header 33 arranged in next row, are formed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which refrigerant evaporates in a refrigeration cycle of an air conditioner.

0002

[Prior Art] In recent years, heat pumps have become popular in air conditioning equipment, and in order to improve the efficiency of refrigeration cycles, heat exchangers, which are the main components of heat exchange equipment, are being made smaller and more efficient by reducing the diameter of refrigerant tubes. As a result, the number of refrigerant circuits in heat exchangers is increasing.

[0003] A conventional heat exchanger (Japanese Unexamined Patent Publication No. 2-219986) will be explained below with reference to the drawings.

FIG. 5 is a perspective view of a conventional heat exchanger, and FIG. 6 is a cross-sectional view taken along line BB' in FIG. FIG. 7 is a right side view of FIG. 5.

In the figure, a substantially U-shaped refrigerant pipe 3 is inserted and joined at right angles to the refrigerant pipe insertion hole of the heat transfer fin 2, which has a plurality of rows of refrigerant pipe insertion holes in one direction of the airflow. The header 8 forms a circuit through which the refrigerant flows.

Here, the depressurized low dryness two-phase refrigerant passes through the inlet pipe 4, flows into the header 5, and enters the refrigerant outlet 5a.
, 5b, 5c, and exchanges heat with the airflow 1 flowing between the heat transfer fins 2 while passing through the refrigerant pipes 3 of the heat exchanger body, and enters the refrigerant inlet 6i of the header 6 from the refrigerant inlets 6a, 6b, 6c. Inflow. Here, the combined refrigerants flow into the refrigerant outlet 6o of the header 6, flow out from the refrigerant outlets 6d, 6e, and 6f, exchange heat again in the refrigerant pipes 3, and refrigerant inlets 7a, 7.
The refrigerant flows into the refrigerant inflow portion 7i of the header 7 from b and 7c. Here, the recombinant refrigerant is transferred to the refrigerant outlet 7 of the header 7.
The number of circuits is increased to prevent the dryness of the refrigerant from increasing and the resistance within the pipe increases, and the refrigerant flows out from the refrigerant outlets 7d, 7e, 7f, and 7g.

[0007] Thereafter, the refrigerant undergoes further heat exchange through the refrigerant pipes 3, flows into the header 8 through the refrigerant inlets 8a, 8b, 8c, and 8d, joins together, and flows out of the heat exchanger through the outflow pipe 9.

[0008]

[Problems to be Solved by the Invention] However, in the above configuration, when the refrigerant evaporates, as shown in FIG. Since it only exchanges heat, if the refrigerant flowing out from the header 8 on the outlet side is used as an evaporator for an air conditioner under environmental conditions (for example, high humidity conditions) where the refrigerant flows out from the header 8 on the outlet side becomes superheated gas, the header 8 on the outlet side The refrigerant in the connected refrigerant pipe 3 overheats and cannot sufficiently cool the airflow 1, allowing humid air to pass through. On the other hand, at the bottom of the heat exchanger, the dryness of the refrigerant on the inlet side is low, so the airflow 1 can be sufficiently cooled and dehumidified.

For this reason, a fan (not shown) installed at the rear of the heat exchanger is cooled by the cold air passing through the lower part of the heat exchanger, while the airflow passing through the upper part of the heat exchanger is insufficient for dehumidification and cooling. Because of the contact with the fan, moisture condenses on the surface of the fan, causing dew to splatter from the air outlet of the air conditioner.

[0010] In view of the above problems, the present invention adopts a flow dividing system that uses a header to reduce the resistance inside the pipe.
To provide a heat exchanger that realizes a refrigerant circuit that does not cause a dew drop phenomenon from an air conditioner outlet even when the refrigerant evaporates under any environmental conditions.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the heat exchanger of the present invention is constructed so that a circuit is formed in which a refrigerant flows sequentially in each row in a header.

Furthermore, the heat exchanger of the present invention is configured such that the refrigerant circuit between the rows of the heat exchanger is formed by connecting substantially U-shaped refrigerant pipes instead of the header.

[0013]

[Function] With the above configuration, the present invention allows heat exchange while the refrigerant flows sequentially through each row of heat exchangers during evaporation of the refrigerant, so even under humid conditions, the airflow is always sufficient in one of the rows before and after the airflow. Even if the refrigerant overheats at the refrigerant circuit outlet, insufficiently cooled and humid air will not be passed through, and moisture will be removed from the surface of the fan installed at the rear of the heat exchanger. It can prevent the problem of dew condensation and splashing from the air conditioner outlet.
Furthermore, it is possible to provide a heat exchanger that employs a split flow system that uses a header to reduce pipe resistance.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Heat exchangers according to embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of the heat exchanger of the first invention, FIG. 2 is a sectional view taken along line AA' in FIG. 1, and FIG. 3 is a right side view of FIG. The flow direction of the refrigerant inside the heat exchanger is shown by solid arrows.

In the figure, the refrigerant pipes 23 are inserted and joined at right angles to the refrigerant pipe insertion holes of the heat transfer fins 22, which have multiple rows of refrigerant pipe insertion holes in the direction of the air flow 21, and the inside is connected from the header 25 to the header 33. A circuit is formed to allow the refrigerant to flow.

Here, the reduced pressure two-phase refrigerant with low dryness passes through the inlet pipe 24, flows into the header 25, and is transmitted through the refrigerant pipes 23 of the heat exchanger body from the refrigerant outlets 25a and 25b. exchanging heat with the airflow 21 flowing between the heat fins 22,
The refrigerant flows into the refrigerant inlet 26i of the header 26 from the refrigerant inlets 26a and 26b. Here, the combined refrigerant flows into the refrigerant outlet 26o of the header 26, and the refrigerant outlet 26c,
26d, heat is exchanged again in the refrigerant pipe 23, and the refrigerant flows into the refrigerant inlet 2 of the header 27 from the refrigerant inlets 27a and 27b.
7i. Here, the recombinant refrigerant flows into the refrigerant outlet 27o of the header 27, and in order to prevent the dryness of the refrigerant from increasing and the resistance in the pipes to increase, the number of circuits is increased, and the refrigerant outlet 27c, 27d , 27e.

Further, the refrigerant exchanges heat in the refrigerant pipe 23, flows into the header 28 through the refrigerant inlets 28a, 28b, and 28c, and joins the header 28, flows out through the refrigerant outlet 28d, 28e, and 28f, and exchanges heat in the refrigerant pipe 23. , refrigerant inlet 29a, 29b,
It flows into the header 29 from 29c and merges with it. and,
The refrigerant flows in the header 29, flows out from the refrigerant outlets 29d, 29e, and 29f on the rear side of the airflow, further exchanges heat in the refrigerant pipe 23, and then passes through the outflow pipe 34 while repeating merging and branching from the header 30 to the header 33. Outflow from heat exchanger.

During this time, the refrigerant flowing into the heat exchanger with low dryness flows through the refrigerant pipe 23 on the front side of the airflow from the header 25 to the header 29, exchanges heat, cools and dehumidifies the airflow 21, and then passes through the header 29. The refrigerant flows from the front side of the airflow to the rear side of the airflow, flows through the refrigerant pipe 23 on the rear side of the airflow from the header 29 to the header 33, further exchanges heat with the airflow 21, and becomes superheated gas.

[0020] In this way, the airflow 21 is always in one of the columns.
can be sufficiently cooled and dehumidified, even under humid conditions.
Insufficient cooling and dehumidifying airflow does not flow backwards, and moisture condenses on the surface of the fan installed at the rear of the heat exchanger.
It is possible to prevent the problem of dew splashing from the air outlet of the air conditioner. It goes without saying that even if the airflow direction is opposite to that of this embodiment, the effect is exactly the same.

Next, a heat exchanger according to a second embodiment of the present invention will be explained with reference to the drawings.

FIG. 4 is a perspective view of the second heat exchanger of the present invention, in which the header 29 of the first embodiment of the invention is replaced by:
The refrigerant inlet 29a and the refrigerant outlet 29d are connected to the refrigerant inlet 2.
9b and the refrigerant outlet 29e, the refrigerant inlet 29c and the refrigerant outlet 29f are connected by refrigerant pipes 23 each processed into a substantially U-shape.

In other words, the connections between the columns of the refrigerant circuit are made with refrigerant pipes instead of headers, and the header's flow dividing function can be achieved without this part, and as a heat exchanger, the header reduces the resistance inside the pipes. Although the flow is divided in other parts, the operation and effect of this embodiment are exactly the same as those of the first invention.

As described above, according to this embodiment, even under humid conditions, the airflow is always sufficiently cooled and dehumidified in one of the rows, so even if the refrigerant is overheated near the heat exchanger outlet, cooling will not occur. This prevents sufficient humid air from passing through, and prevents the problem of moisture condensing on the surface of the fan installed behind the heat exchanger and causing dew to fly out from the air conditioner's outlet. In addition, it is possible to provide a heat exchanger that employs a split flow system that uses a header to reduce the resistance inside the pipes.

[0025]

[Effects of the Invention] As described above, in the present invention, when the refrigerant evaporates, the refrigerant exchanges heat while flowing sequentially through each row of heat exchangers. Because it cools and dehumidifies, even if the refrigerant gets overheated near the heat exchanger outlet, insufficiently cooled and humid air will not pass through, and moisture will condense on the surface of the fan installed at the rear of the heat exchanger. It is possible to provide a heat exchanger that can prevent the problem of dew splashing from the air outlet of an air conditioner, and also employs a shunting system that uses a header to reduce resistance inside the pipes.

Furthermore, since it is possible to design a piping pattern in which headers are connected to both sides of the heat exchanger, it is possible to improve the degree of freedom in design, such as providing refrigerant inlets and outlets on both sides of the heat exchanger.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat exchanger in a first embodiment of the present invention.

[Figure 2] Cross-sectional view taken along line A-A' in Figure 1

[Figure 3] Figure 1
Right side view of the heat exchanger

FIG. 4 is a perspective view of a heat exchanger in a second embodiment of the present invention.

[Figure 5] Perspective view of a conventional heat exchanger

[Fig. 6] Cross-sectional view taken along line B-B' in Fig. 5

[Figure 7] Figure 5
Right side view of the heat exchanger

[Explanation of symbols]

22 Heat transfer fins 23 Refrigerant pipes 25, 26, 27, 28, 29, 30, 31, 32, 3
3 Header

Claims (2)

[Claims] 1. A heat transfer fin having a plurality of rows of refrigerant tube insertion holes in the airflow direction; and a refrigerant tube inserted and joined at right angles to the refrigerant tube insertion holes of the heat transfer fin, through which a refrigerant flows.
A heat exchanger comprising a header piped so that a plurality of circuits of refrigerant flow through the refrigerant pipes, and the header forms a circuit in which the refrigerant sequentially flows in each row. 2. A heat transfer fin having a plurality of rows of refrigerant tube insertion holes in the airflow direction, and a refrigerant tube inserted and joined at right angles to the refrigerant tube insertion holes of the heat transfer fin, through which a refrigerant flows.
The refrigerant pipe is characterized by comprising a substantially U-shaped refrigerant pipe piped so that there are a plurality of circuits for the refrigerant flowing through the refrigerant pipe, and the substantially U-shaped refrigerant pipe forms a circuit in which the refrigerant flows sequentially in each row. heat exchanger.