JP2583394Y2 - Refrigerant coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a refrigerant coil, and more particularly to a refrigerant coil used in, for example, a variable air flow type (VAV type) heat pump type air conditioner equipped with a plurality of compressors. .

(Prior art)

As a conventional refrigerant coil in this type of air conditioner, there have been refrigerant coils 1a to 1d shown in FIGS.
The refrigerant coils 1a and 1b shown in FIG. 5 and FIG.
Used in an air conditioner equipped with two compressors, and a refrigerant coil 1c and a refrigerant coil 1c shown in FIGS. 7 and 8.
1d is used for an air conditioner equipped with two compressors.

In these refrigerant coils 1a to 1d, the coil circuits 3 disposed through the coil fin block 2 are regularly arranged so that the coil circuits 3 adjacent to each other in the ventilation direction 4 do not overlap with each other. The ventilation area covered by the circuit 3 was almost evenly distributed.

[Problems to be solved by the invention]

Generally, in such a variable air volume type air conditioner,
At low airflow the load is reduced, so the number of operating compressors is reduced and the number of functioning coil circuits is reduced. On the other hand, regardless of the amount of air flow, the air passes through the coil fin block, that is, the entire refrigerant coil, so that it passes not only the functioning refrigerant coil but also the non-functioning refrigerant coil. Therefore, the heat exchange efficiency of the coil deteriorates.

As a result, during cooling, the evaporation temperature is reduced, and frost is formed on the indoor coil. In addition, during heating, there is a problem that the condensing temperature rises, and the compressor protection device for high pressure cut or high temperature cut is activated.

Therefore, a main object of the present invention is to provide a refrigerant coil capable of maintaining a high heat exchange rate even at a low air flow.

[Means for solving the problem]

The present invention is a refrigerant coil including a plurality of coil circuits each individually connected to a corresponding compressor, and arranges each of the coil circuits so as not to shift to the upper stage after shifting from the upper stage to the lower stage. In addition, the refrigerant coil is characterized in that a coil circuit connected to a compressor that operates even at a low airflow is extended to a region where another coil circuit is provided.

[Action]

Even at low airflows, most of the air passes through the coil circuit connected to the operating compressor. In addition, although a refrigerant mixture of a gaseous refrigerant and a liquid refrigerant flows in the coil circuit, each of the coil circuits is arranged so as not to move to the upper stage after moving from the upper stage to the lower stage, No stagnation of liquid refrigerant occurs in the circuit. Therefore, the heat exchange rate of the coil is kept high.

[Effect of the invention]

According to the present invention, the heat exchange rate of the coil can be maintained high even when the air volume is low. Therefore, during cooling, a decrease in the evaporation temperature can be suppressed, and frost formation on the indoor coil can be prevented.
In addition, the rise of the condensing temperature during heating can be suppressed, and the stop of the compressor due to the operation of the compressor protection device for high-pressure cut or high-temperature cut can be prevented.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

Referring to FIG. 1, a refrigerant coil 10 of this embodiment corresponds to the conventional example shown in FIG. That is, the refrigerant coil 10 includes three coil circuits 12, 14 to which the refrigerant is supplied from three compressors (not shown).
And 16 inclusive. These coil circuits 12, 14 and 16 are arranged so as to penetrate the coil fin block 18, respectively. What should be noted is the arrangement state of the coil circuits 12, 14, and 16.

First, the coil circuit 12 connected to a compressor (not shown) that is operated even at a low air flow is arranged so as to extend over substantially the entire ventilation area of the coil fin block 18, and the U-bend 20 extends from one end 22 a to the U-bend 20. While turning up, it shifts upward in two stages, and then shifts downward in five stages to reach the other end 22b. Further, the coil circuit 14 is disposed in substantially the upper half of the ventilation area, shifts upward from one end 24a in two stages, then shifts in the horizontal direction, shifts downward in four stages, and shifts to the other end 24b. Leads to. Further, the coil circuit 16 is disposed in a substantially lower half of the ventilation area, and shifts upward from one end 26a in two stages, then shifts in the horizontal direction, shifts downward in four stages, and shifts to the other end 26b Leads to.

In the embodiment of FIG. 1, each coil circuit 1
Solid lines representing 2, 14 and 16 are coil fin blocks
It is a part that is formed in front of 18 and is actually visible,
The dotted line portion is formed on the other side of the coil fin block 18 and indicates a hidden portion. This applies not only to the embodiment shown in FIG. 1 but also to the embodiments shown in FIG.

The coil circuits 12, 14 and 1 thus formed
As a set of 6, the coil fin blocks 18 are arranged repeatedly from above to below, that is, in the direction of arrow 27.

In operation, if only the coil circuit 12 is operated at the minimum air volume, the heat exchange rate of the coil is almost the same as that at the full air volume even if the air volume is 1/3 of the full air volume. This is because the coil circuit 12 is arranged so as to extend over substantially the entire ventilation area, so that most of the air passing through the refrigerant coil 10 passes through the coil circuit 12 and undergoes heat exchange.

According to this embodiment, as shown in FIG. 1, each of the coil circuits 12, 14, and 16 is arranged so as not to shift to the upper stage after shifting from the upper stage to the lower stage. No recess is formed in the refrigerant flow path in the inside, and the stagnation of the liquid refrigerant can be prevented. In addition, even when the air volume is low, most of the air can be passed through the coil circuit connected to the operating compressor. Therefore, high heat exchange efficiency can be maintained as a whole.

Arrows 28 at one end and the other end of each of the coil circuits 12, 14 and 16 indicate the direction of flow of the refrigerant during heating, arrow 30 indicates the direction of flow of the refrigerant during cooling, and arrow 31.
Indicates the inflow direction of air. This applies not only to the embodiment shown in FIG. 1 but also to the embodiments shown in FIG.

A refrigerant coil 40 of another embodiment shown in FIG. 2 corresponds to the conventional example shown in FIG. 6, and three coil circuits 42, 44 and 46 are also used in this refrigerant coil 40. That is, in the refrigerant coil 40, the coil circuit 42 connected to the compressor that is operated even at a low air volume is arranged so as to extend substantially over the entire ventilation area, and reciprocates two times from one end 48a to the other end 48b. Reach.
Further, the coil circuit 44 is disposed in substantially the upper half of the ventilation area, and reciprocates two times from one end 50a to reach the other end 50b.
Further, the coil circuit 46 is disposed substantially in the lower half of the ventilation area, and reciprocates two times from one end 52a to the other end 52b.

Further, the refrigerant coil 60 of another embodiment shown in FIG.
Corresponds to the conventional example shown in FIG. 7, in which two coil circuits 62 and 64 are used. That is,
In this refrigerant coil 60, coil circuits 62 and 64
Are arranged so as to extend over substantially the entire area of the ventilation area, and the coil circuits 62 and 64 reciprocate six times from one end 66a and 68a, respectively, and reciprocate at the other end 66b and 68b
Leads to.

In this example, two coil circuits 62 and 64
Since both are arranged over substantially the entire area of the ventilation area, a high heat exchange rate can be maintained regardless of which of the coil circuits 62 and 64 functions when the airflow is low.

The refrigerant coil 70 of another embodiment shown in FIG. 4 corresponds to the conventional example shown in FIG. 8, and uses two coil circuits 72 and 74. That is, in the refrigerant coil 70, the coil circuit 72 and
The coil circuit 74 is disposed over substantially the entire area of the ventilation area, and the coil circuits 72 and 74 reciprocate three times from one end 76a and 78a, respectively, to the other end 76b and 78b.

Also in this embodiment, since both of the two coil circuits 72 and 74 are arranged over the ventilation area, the heat exchange rate can be maintained high even if any of the coil circuits 72 and 74 is operated at a low air flow.

2 to 4, one set of coil circuits arranged at the uppermost part of the coil fin block 18 is shown and described. However, as in the embodiment shown in FIG. Set as required
It goes without saying that the coil fin blocks 18 are repeatedly arranged from above to below.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention. FIG. 2 is an illustrative view showing another embodiment of the present invention. FIG. 3 is an illustrative view showing another embodiment of the present invention. FIG. 4 is an illustrative view showing still another embodiment of the present invention. 5 to 8 are illustrative views showing a conventional technique. In the figure, 10, 40, 60, and 70 indicate refrigerant coils, 18 indicates a coil fin block, and 12, 14, 16, 42, 44, 46, 62, 64, 72, and 74 indicate coil circuits.

Continuing on the front page (72) Inventor Koichi Takeuchi 28 Hirade Industrial Park, Utsunomiya City, Tochigi Prefecture Inside Kubota Train Co., Ltd. Tochigi Plant JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A refrigerant coil including a plurality of coil circuits, each of which is individually connected to a corresponding compressor, so that each of said coil circuits does not shift to an upper stage after shifting from an upper stage to a lower stage. A refrigerant coil, wherein a coil circuit connected to a compressor that operates even at a low air flow is extended to an area where another coil circuit is provided.