JPS62196533A - Ceiling embedded type air conditioner - Google Patents

Abstract

PURPOSE:To make a uniform speed of air passing through a heat exchanger and utilize a maximum capacity of heat exchanging operation in a heat exchanger by a method wherein a fin pitch of the heat exchanger at a part opposing to a blowing port of a blower is constructed to be smaller than that of other portions. CONSTITUTION:Since a width S of a blowing port of a blower 11 is shorter than a length l between end plates of heat exchangers 17 and 17', a distribution of air speed at the front surfaces of the heat exchangers 17 and 17' shows a high value at a part opposing to blowing ports 10 and 10' of the blower, and an air speed at the front surfaces of the heat exchangers at the end portions of the heat exchangers 17 and 17' become low. However, since the fin pitch at the portions 17a and 17a' showing a high air speed at the front surface becomes smaller than that of other portions, an air resistance becomes high and a passing air speed is decreased. Since the fin pitch at the portions where an air speed at the front surface is low is relatively large, the air resistance becomes low and a passing air speed is increased. The passing air speed is made uniform throughout an entire heat exchanger, an efficiency of heat exchanging operation is improved, an air resistance in the entire heat exchanger is reduced, thereby a performance of air blowing can be improved and a noise of air blowing can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ceiling-embedded air conditioner used for indoor heating and cooling.

Conventional technology In recent years, there has been a trend toward thinner ceiling-mounted air conditioners.
Therefore, the heat exchanger is often installed facing the blower outlet, and the length between the end plates of the heat exchanger is larger than the width of the blower outlet. In some cases, the heat exchange efficiency was sacrificed due to non-uniformity.

An example of the above-mentioned conventional ceiling-embedded air conditioner will be described below with reference to the drawings. FIGS. 3 and 4 show a conventional ceiling-embedded air conditioner.

In the figure, 1 is mainly dust from the ceiling-mounted air conditioner, 2
is a box with an insulated structure. Reference numeral 3 denotes a motor equipped with a centrifugal impeller 4, which is fixed within the box body 2 via a cushioning material. 6 is a top plate 8 having a spiral side plate 6.6' and a suction lower. and drain grooves 9, 9' are formed in an integrally formed casing. The centrifugal impeller 4 and the spiral side plates 6 and 6' provided around it, together with the box body 2 and the top plate 8, form a blower 11 having two air outlets 10 and 10'. Heat exchangers 12° and 12' are disposed on the air blower 11 and have a length β between the end plates longer than the width S of the air outlet facing the air outlet 10 and 10' of the blower 11, respectively.
is provided. 13 is an orifice provided in the suction lower of the blower 11, and 14 is a lid body which has a suction grill 15 and outlet grilles 16, 16' and is attached to the lower surface of the box body 2.

The operation of the ceiling-embedded air conditioner configured as above will be described below.

The air sucked in from the suction grill 14 flows through the orifice 13.
The air is drawn into the blower 11 via the centrifugal impeller 4, where dynamic pressure and static pressure are applied, and then the air is separated into the air outlets 10 and 10' and discharged. The discharged air is transferred to the heat exchanger 12
, 12'i, the air is exchanged with heat and its temperature changes, and then discharged into the room from the outlet grilles 16 and 16' for air conditioning.

Problems to be Solved by the Invention However, in the above configuration, since the length l between the end plates of the heat exchanger is long with respect to the outlet S of the blower 11, as shown in line A in FIG. The wind speed distribution in front of the heat exchanger becomes uneven, especially at the outlet 10 of the blower 11.
, 10', the front wind speed of the heat exchanger is high,
At the ends of the heat exchangers 12 and 12', the wind speed on the front surface of the heat exchangers becomes small. As a result, the wind speed passing through the heat exchangers 12, 12' is also large at the portion facing the outlet 10°10' of the blower 11, as shown by line B in Figure 5, and becomes smaller at the end of the heat exchanger. This resulted in an uneven distribution, which not only deteriorated the heat exchange efficiency of the heat exchanger, but also increased the ventilation resistance of the heat exchanger as a whole, resulting in problems such as a decrease in air blowing performance and an increase in blower noise. . Moreover, under cooling conditions, as shown in FIG. 6, the speed of air passing through the heat exchanger in the portion facing the outlet 10, 10' of the blower 11 is greater than in other portions, so the drain grooves 9, 9 The condensed water accumulated in the heat exchanger is permeated by the airflow passing through the heat exchangers 12 and 12', is scattered outside the drain grooves 9 and 9', and is discharged to the outside of the aircraft via the outlet grilles 16 and 16'. It had many problems, including the phenomenon of falling.

In view of the above problems, the present invention has a mechanism that equalizes the wind speed passing through the heat exchanger and maximizes the heat exchange capacity of the heat exchanger even if the wind speed in front of the heat exchanger is uneven. The company provides a ceiling-embedded air conditioner.

Means for Solving the Problems of 6'' In order to solve the above-mentioned problems, the ceiling-mounted air conditioner of the present invention has a fin pitch of the heat exchanger facing the blower outlet. It has a denser structure than the part.

Effects According to the present invention, with the above-described configuration, the fin pitch of the heat exchanger in areas where the front wind speed is high is denser than the fin pitch in areas where the front wind speed is low. As the ventilation resistance increases, the passing air velocity decreases, and in areas where the front wind velocity is small, the air passing resistance becomes relatively small, so the passing air velocity increases, and the passing air velocity becomes uniform throughout the heat exchanger.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. In order to avoid duplication of explanation, the same parts as in the conventional example are designated by the same reference numerals, and the explanation will be omitted.

In the figure, reference numerals 1 and 17' indicate a heat exchanger installed facing the air outlets 6 and 10' of the blower 11, and a portion 17a facing the air outlets 1o and 10' of the air blower 11.
, 17a' are made denser than other parts.

The operation of the ceiling-embedded air conditioner configured as above will be explained below.

The air sucked in from the suction grill 14 flows through the orifice 13.
The air is drawn into the blower 11 via the centrifugal impeller 4, where dynamic pressure and static pressure are applied thereto, and then the air is separated into the air outlets 10 and 10' and discharged. Since the width S of the outlet of the blower 11 is shorter than the length 4 between the end plates of the heat exchangers 17 and 17', the wind speed distribution in front of the heat exchangers 17 and 17' is as shown by line A in Fig. 5. As shown, the blower outlets 10, 10
The heat exchanger 17, 17' is large in the part facing '.
At the end of the heat exchanger, the wind speed in front of the heat exchanger is small.

However, 17a is a portion where the front wind speed is high.

At 178', the fin pitch is denser than in other parts, so the ventilation resistance increases and the passing wind speed decreases as shown by line C. In addition, in the region 7A''-7 where the front wind speed is small, the fin pitch is relatively coarser than in 17a and 17a', so the ventilation resistance is small and the passing wind speed increases as shown by line C.As shown in -42 below. According to this embodiment, it is possible to equalize the passing wind speed throughout the heat exchanger.
This not only improves heat exchange efficiency but also reduces the ventilation resistance of the heat exchanger as a whole, improving ventilation performance.
It is possible to reduce air blowing noise. Moreover, as the airflow velocity passing through the heat exchanger 17, 17' becomes uniform, the maximum passing velocity decreases, and the airflow passing through the heat exchanger during cooling causes accumulation in the drain grooves 9, 9'. There is no risk of splashing condensed water.

Effects of the Invention As described above, the present invention provides a heat exchanger having a length between the end grates that is longer than the width of the air outlet facing two air outlet ports of the air blower, and a heat exchanger that faces the air outlet ports of the air blower. By making the fin pitch of the heat exchanger denser than other parts, it is possible to equalize the passing air velocity throughout the heat exchanger, improving heat exchange capacity, improving air blowing performance, reducing air blowing noise, and reducing heat. It can prevent condensed water from scattering in the exchanger.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a ceiling-embedded air conditioner of the present invention;
Figure 2 is a cross-sectional view taken along line n-n' in Figure 1, Figure 3 is a cross-sectional view showing a conventional ceiling-mounted air conditioner, and Figure 4 is a cross-sectional view taken along line IV in Figure 3.
-IV' sectional view, FIG. 5 is a characteristic diagram showing the front wind speed distribution and passing wind speed distribution of the heat exchanger, and FIG. 6 is an enlarged sectional view of the main part of FIG. 3. 2...Box body, 4...Centrifugal impeller, 6
, 6'... spiral side plate, 10, 10'...
...Air outlet, 11...Blower, 17, 17'
...Heat exchanger, 17a, 17a'...
Fin pitch dense area. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. ri' □5 = Here/6' Fig. 2 2-M stop, 10.1 θ'-Blowout port l ■ I' 2- Box/θ, lθ'°-Blowout port Fig. 3 41' 115 yeah'

Claims (1)

[Claims] A blower having two air outlets configured by a centrifugal impeller and two spiral side plates provided around the air blower is disposed inside the box, and a blower having two air outlets is provided facing the two air outlets of the blower. The ceiling-embedded air conditioner is provided with heat exchangers each having a length between end plates that is longer than the width thereof, and in which the fin pitch of the heat exchanger in a portion facing the air outlet of the blower is denser than in other portions.