JPS5834338Y2 - fan coil unit - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a fan coil unit used for exchanging heat between air and refrigerant, such as in an indoor unit or an outdoor unit of an air conditioner.

FIG. 1 shows an example of a conventional fan coil unit, specifically an outdoor unit of an air conditioner.

In Fig. 1, 1 is an outer box of the unit, 2 is an air suction port provided in the outer box 1, and 3 is a front and rear port provided near the suction port 2 for heat exchange between air and refrigerant. A plate-fin type heat exchanger having two rows of heat exchange pipes 3 a and 3 b; 4 is a blower fan consisting of a propeller fan provided in the outer box 1 near the upper end of the heat exchanger 3; 5 is a blower fan 4; 6 is an outlet guard, 7 is an electric motor for driving the
8 is a compressor for compressing refrigerant, and 8 is an accumulator for storing liquid refrigerant so that it does not enter the compressor 7.

In the conventional outdoor unit as described above, for example, when cooling a room, a high temperature refrigerant compressed by a compressor 7 is passed through the pipes 3a and 3b of the heat exchanger 3, and the blower fan 4 is driven at the same time. By flowing the air at room temperature to the outer periphery of the pipes 3a and 3b of the heat exchanger 3, the heat contained in the refrigerant is transferred to the air to create a low heat refrigerant, which is then supplied to the indoor unit via a pressure reduction mechanism. ing.

As in this conventional example, when the blower fan 4 consisting of a propeller fan is placed near the upper end of the heat exchanger 3, the flow of air passing through the heat exchanger 3 is as shown by the arrow in FIG. Therefore, even if the flow is almost perpendicular to the heat exchanger 3 in the upper part near the fan 4, the flow is often diagonally upward to some extent in the lower part away from the fan 4.

For this reason, even if the front and rear heat exchange pipes 3a and 3b are arranged in a so-called staggered manner in which they are arranged vertically in rows with good heat exchange characteristics, the pipes 3a and 3b face each other in the lower part. This is practically the same as using a so-called base-like array heat exchanger, and is one of the reasons why the overall heat exchange characteristics are worse than the designed values.

The purpose of this invention is to improve heat exchange characteristics without using a heat exchanger with a particularly complicated structure by eliminating the drawbacks of the conventional ones as described above.

Examples of this invention will be described below with reference to the drawings.

In FIG. 2 showing one embodiment, 1 is a unit outer box; 2 is a unit outer box;
is an air inlet, 4 is a blower fan, 5 is an electric motor, 6 is an outlet guard, 7 is a compressor, 8 is an accumulator,
These are the same as the conventional ones described above.

The heat exchanger 3 is divided into two types, upper and lower, and the part near the blower fan 4 is a staggered heat exchanger 3A in which the front and rear heat exchange pipes 3a and 3b are vertically different from each other. The portions away from the blower fan 4 are the front and rear heat exchange pipes 3a.
, 3b are heat exchangers 3B in a base-like arrangement facing each other at the same position in the vertical direction.

The role of each heat exchanger 3A, 3B of this fan coil unit is the same as that of the conventional one described above, but the heat exchange characteristics of the heat exchanger 3 are different, and the air flows upward to some extent in the lower part. pipes 3 a and 3 b in a base-like arrangement
Since it is a heat exchanger 3B with a heat exchanger 3B, it can essentially obtain heat exchange characteristics comparable to a heat exchanger with a staggered arrangement of pipes, which have better heat exchange characteristics, and improve the overall heat exchange characteristics. You can do it.

The position of the boundary between the heat exchanger 3A in which the pipes 3a and 3b are arranged in a staggered manner and the heat exchanger 3B in which the pipes are arranged in a base-like manner is the position of the boundary between the heat exchanger 3A in which the pipes 3a and 3b are arranged in a staggered manner and the heat exchanger 3B in a base-like arrangement. 3A and 3B
As is clear from the general detailed dimensional drawings, it is expected that the air inlet flow angle α should preferably be located in the vicinity of about 15°.

Moreover, the results of experiments using the one shown in FIG. 2 also confirmed that the heat exchange characteristics are good when the inflow flow angle α is approximately 10° to 18°.

However, since the position of the boundary between the heat exchangers 3A and 3B varies depending on the type of blower fan 4 and the positional relationship between the heat exchanger 3 and the blower fan 4, it is necessary to know the inflow flow angle of the air. In any case, the inflow flow angle tends to be larger in the part farther from the blower fan.

FIG. 4 shows another embodiment of this invention, which includes a blower fan 4 consisting of a cross-flow fan, which is currently most commonly used as an indoor unit of home air conditioners, and a blower fan 4 as described above. This is a combination of heat exchangers 3 having the same heat exchangers 3A and 3B with different pipe arrangements.

In this embodiment, the heat exchanger 3 is also located near the blower fan 4.
On the other hand, even though the air is flowing in almost perpendicularly to A, the air is flowing diagonally downward to some extent in the distant heat exchanger 3B, so in the heat exchanger 3A near the blower fan 4, the pipe 3a , 3b are arranged in a staggered manner, and the heat exchangers 3 are spaced apart.
In B, the pipes 3 a and 3 b are arranged in a base-like arrangement, and this heat exchanger 3 can also be expected to improve the heat exchange characteristics.

In this invention, the above explanation was about a plate fin type heat exchanger in which plate fins were attached to the outer peripheral surfaces of the heat exchange pipes 3a and 3b through which the refrigerant flows, but needle-like fins are wrapped around the heat exchange pipes and bonded. A similar effect can be expected by using a needle-fin type heat exchanger.

As explained above, according to this invention, there is no need to use an expensive heat exchanger with a particularly complicated structure, just by arranging the heat exchange pipes of a commonly used inexpensive heat exchanger. The heat exchange characteristics can be improved to the same extent as when a heat exchanger having substantially better heat exchange characteristics is used.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of a conventional fin coil unit, Fig. 2 is a side sectional view showing an embodiment of this invention, and Figs. 3 A and B are different arrangement sections of heat exchange pipes. FIG. 4 is a side sectional view showing another embodiment of this invention. 3.3 A, 3 B... Heat exchanger, 3 a,
3 b...7...Heat exchange pipe, 4...Blower fan. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (3)

[Scope of utility model registration request] (1) Heat exchanger 3 having multiple rows of front and rear heat exchange pipes 3 a and 3 b for exchanging heat between air and refrigerant.
and a blower fan 4 provided at a position biased to either the top, bottom, right or left with respect to the heat exchanger 3, the arrangement of the heat exchange pipes 3a, 3b in the column direction of the heat exchanger 3 is In the part near the blower fan 4, the front and rear heat exchange pipes 3a and 3b are arranged in different directions, and the blower fan 4
The front and rear heat exchange pipes 3a and 3b are located far from the
A fan coil unit characterized in that the fan coil units are arranged so as to face each other. (2) The fan coil unit according to claim 1, in which the heat exchanger 3 is a plate-fin type heat exchanger. (3) The fan coil unit according to claim 1, in which the heat exchanger 3 is a needle-fin type heat exchanger.