JPH0792240B2 - Air conditioner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to control of blown air thereof.

2. Description of the Related Art In recent years, comfort in the indoor environment created by air conditioners has come to be emphasized.

As a conventional technique, for example, as disclosed in Japanese Utility Model Laid-Open No. 61-3337, there is an air conditioner that uses an underfloor.

Hereinafter, a conventional cooling and heating device will be described with reference to FIGS. 7 to 13.

FIG. 7 shows a cross-sectional side view of the conventional cooling and heating device during heating. In FIG. 7, 1 is a room. 2 is a floor and 2a is a floor slab. 1'is a room downstairs, 3
Is this ceiling board. 4 is a space formed between the floor 2 and the ceiling plate 3. Reference numeral 5 is a heat pump type air conditioner installed near the outer wall of the space 4. Reference numeral 6 is an air supply duct of the heat pump type air conditioner 5. 7
Is a damper that switches the air passage according to cooling and heating.
Reference numeral 8 denotes a heating chamber formed by the floor slab 2a and the wall plate 11. 8a is a partition wall of the heating chamber 8. 8b is the partition wall
It is a vent formed at the end of 8a. Reference numeral 9 denotes a blower opening for blowing warm air into the warming room 8 during heating. Reference numeral 10 denotes a blower port for blowing cool air into the chamber 1 to cool the room. Reference numeral 12 is an air supply port of the heat pump type air conditioner 5. Reference numeral 13 is a communication port that communicates with the heating chamber 8 and the space 4. Reference numeral 14 is a communication port that communicates with the chamber 1 and the heating chamber 8.

The operation of the cooling and heating device configured as described above will be described below.

First, at the time of heating, hot air warmed by the heat pump type air conditioner 5 is sent to the air supply duct 6. And
The damper 7 operates as shown in FIG. 13, and warm air is sent to the blower port 9 and flows into the warming room 8. At this time, the floor slab 2a is heated by warm air, and the room 1 is heated by natural convection generated by the heat of the floor surface. Then, the warm air in the warming greenhouse passes through the ventilation port 8b as shown by the solid line arrow in FIG. 8 and then from the communication port 13 to the space 4 as shown in FIG.
And is returned to the air supply port 12.

Next, at the time of cooling, the damper 7 closes the blower port 9, so that the cool air cooled by the heat pump type air conditioner 5 is blown from the blower port 10 to the chamber 1 as shown in FIG.
Directly blow out to cool. The cool air that cools the chamber 1 is
As shown in FIG. 12, the space 4 passes through the communication ports 14 and 13.
After reaching, the gas is returned to the air supply port 12.

Problems to be Solved by the Invention However, in the above-described configuration, since hot air is not blown directly into the room at the time of heating, there is a problem that it takes time for the room to reach the set temperature at the start of operation.
Further, since the floor slab is warmed with warm air to heat the room by natural convection generated by the heat of the floor surface, there is a problem that heat loss to the floor is large and heating efficiency is poor.

On the other hand, during cooling, since the position of the air outlet and the position of the suction port are close to each other, a short circuit phenomenon in which temperature-controlled air returns directly to the suction port without cooling the interior of the room is likely to occur, reducing the cooling efficiency and reducing the temperature. It had the drawback of a very poor distribution.

Moreover, the cold draft (cold air convection) from the window, especially during heating, made it impossible to deal with the phenomenon that the feet of the residents near the window became cold.

The present invention solves the above-mentioned problems, and provides an air conditioner capable of quickly setting a room temperature at the start of heating operation and improving heating efficiency.

Further, it is intended to provide a warm head cold foot heat type air conditioner which is capable of preventing a cold draft phenomenon because it has a configuration capable of coping with load fluctuations of windows.

Means for Solving the Problems In order to achieve this object, an air conditioner of the present invention comprises an upper air outlet opening at an upper part of an indoor unit and a lower air outlet opening at a lower part and communicating with a lower space of a double floor. The amount of hot air and cold air blown out from the outlet is adjusted by the outlet flow diverter to adjust the blowout ratio from the upper and lower outlets according to the indoor load.

Further, the suction port is switched according to each cooling / heating operation mode, and in particular, a short circuit to the suction port of the blown air at the time of cooling operation and startup of heating operation is prevented.

Effect of the Invention With the above-described configuration, the present invention, during cooling, blows the cool air from the upper air outlet on the indoor side of the indoor unit upward toward the ceiling by the air flow diverting means, opens the lower air inlet, and opens the front air inlet. The suction port switching means is actuated so as to close, and the air is sucked from the ventilation port provided at the end of the double floor.

As a result, without a short circuit at the inlet,
It is possible to circulate the entire residential area, and the temperature distribution can be greatly improved. Further, at the start of the heating operation, all the hot air is blown from the upper air outlet on the indoor side of the indoor unit by the blowout / diverting means to warm the room quickly.

As a result, the blown-out warm air can sufficiently warm the living area without short-circuiting the intake port. Then, as the room temperature approaches the set temperature, the blow-off and branching means gradually shifts from the upper blow-off to the lower blow-off, and warm air is passed through the lower space of the double floor to further warm the feet. As a result, the amount of air blown from the upper air outlet is reduced, and the discomfort caused by the wind is eliminated. In other words, it is possible to create an ideal thermal environment of a head-and-foot type with almost no feeling of cold.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

21 is a side wall, 22 is a floor slab, and 23 is a ceiling. 24 is a living area where humans live, and the height of ASHRAE.STANDARD is 1800m.
It is defined as a space that is less than m and 600 mm or more away from the side wall (the space surrounded by the two-dot chain line in Fig. 2). Reference numeral 25 is an indoor unit of an air conditioner, which is installed on the floor of one corner of the room.

The indoor unit 25 has an outer shell 26, a heat exchanger 27, a blower 28, a casing 29, and a fulcrum on the outer shell 26, and an electric motor (not shown).
The blow-off / flow dividing means 30 driven by the above, the upper blow-out port 31 on the upper surface, and the lower blow-out port 32 on the lower surface are provided, and they are communicated with each other by the air passage 33 at the back of the indoor unit 25.

Further, the upper outlet 31 is provided with a plurality of louvers 34 so that the outlet angle can be arbitrarily changed. A first suction port 35 is provided at the lower front portion of the indoor unit 25, a second suction port 36 is provided at the lower front portion, and suction port switching means 37 is provided so that both suction ports 35, 36 can be selected. ing. In this embodiment, the damper 37a is used as a rotation shaft, and is driven by a timing motor (not shown) or the like.

On the other hand, a room temperature sensor 38 for detecting the suction temperature is installed between the suction port 35 and the heat exchanger 27.

Reference numeral 39 denotes a double floor, 40 denotes a lower space formed by the floor slab 22 and the double floor 39, and the lower air outlet 32 and the suction port B36 communicate with the lower space 40.

Further, 41 is a ventilation port communicating with the room at the end where the double floor 37 and the side wall 21 meet, and this position is the lower blowing port 32.
As far away as possible from the side wall 21 to 600 mm
The best position is within the area where people will not come in and go out and office equipment (such as a library) does not get in the way.

The operation of the air conditioner configured as described above will be described with reference to a flowchart.

After the power is turned on, the temperature (Tset) of the room 1 is set 42, and the cooling / heating mode is selected 43.

First, at the time of heating, the suction port switching means 37 opens the suction port A35 and closes the suction port B36. As a result, the blower 26, the suction port A35 and the chamber 1 communicate 44 as shown in FIG. Next, the room temperature sensor 38 detects the room temperature Tr 45. Next, set temperature Ts
The difference θ between et and the detected room temperature Tr is calculated. Here, when θ = Tset-Tr> 10 ° C is satisfied (when YES), that is, when the room temperature is lower than the set temperature by 10 ° C or more46, the vanes of the outlet flow diverter 30 are set so that the upper outlet becomes 100%. It rotates downward (Fig. 3) and closes the air passage 33 to the lower air outlet 32 47. In other words, when the living area 24 is cold, hot air is blown directly into the living area to quickly set the temperature.
Control so that it approaches Tset.

Next, when the temperature difference θ is 10 ≧ θ> 5 ° C., the vanes of the outlet flow diverting means 30 rotate slightly upward like 48 set to 30% for the lower outlet and 70% for the upper outlet, and 30a in FIG. Stop at position. As a result, while warming the living area directly, it warms the floor, albeit little by little, and uses heating from below.

And, if 5 ≧ θ> 2 ° C, 70% of lower blow and 30 of upper blow
The vane of the blow-off flow dividing means 30 rotates further upward than before, and stops at the position of 30b, like 49 set to%.

In other words, since the room temperature has come very close to the set temperature, the proportion of directly heating the living area 24 is reduced and the floor heating center type is switched.

Then, if the condition of θ ≦ 2 ° C. is satisfied, all the hot air is blown downward 50, and the hot air blown from the lower outlet 32 is in the lower space.
Passing 40, warm the double floor 37 and proceed to the ventilation opening 41 to blow into the room 1. In other words, if the room temperature is close to the set temperature, the double floor
39 Radiant floor heating is realized by passing warm air through the lower space 40 to warm the entire floor (solid arrow in Fig. 2).

Next, at the time of blowing and cooling operation, proceed to NO side by selecting 43,
The first suction port is closed and the second suction port is opened 51. As a result, the blower 26, the suction port B36, and the lower space 40 communicate with each other as shown in FIG.

As for the air outlet, the upper air outlet 100% is unconditionally controlled to 44, and cool air is blown upward from the upper air outlet 31 (dotted line arrow in FIG. 2). Then, the cool air flowing upward hits the ceiling 23 and descends from there while spreading downward due to its own weight. Then, after the living area 24 is cooled uniformly, it is sucked into the ventilation port 41 (FIG. 3).

According to the above-described embodiment, in the heating operation, control is performed so as to suck from the first suction port 35 on the front surface of the lower part of the main body. By driving the vanes of the blowout / diverting means 30, hot air is blown out from the upper outlet 31 to directly heat the living area 24. On the other hand, when the difference between the room temperature and the set temperature becomes smaller, a part of the warm air is gradually sent to the lower space 40 of the double floor 39 to drive the vanes of the blowout / diverting means 30 so that the warm air blows out from the ventilation port 41. Let Then, when the difference between the set temperature and the room temperature becomes smaller, all of the warm air is controlled to be sent to the lower space 40.

As a result, mild heating is possible due to both the heating effect of natural convection from the entire heated double floor and the heating effect of blowing hot air from the ventilation openings.

As a result, the start-up performance during heating is good, and if it approaches the steady operation state, it can be made a living space close to floor heating, so it is possible to perform heating with little head up / down heat type and no discomfort due to wind. .

On the other hand, at the time of cooling, the cool air is blown upward from the upper blower 30 and hits the ceiling, after which it naturally descends due to the weight of the cool air and sucks it from the ventilation port 41 provided on the opposite side of the indoor unit body 25, so that the cool air goes further It is possible to feed air, and it is possible to realize high-quality air conditioning with an extremely uniform temperature distribution and no discomfort due to wind.

In this embodiment, the setting criteria for the ratio of blowout diversion is 10 ° C, 5 ° C, 2 ° C.
However, this value is not unique because it changes depending on the room size and load.

Further, in this embodiment, the lower space is formed by the double floor, but it goes without saying that the same effect can be obtained even if the lower space is provided under the floor.

EFFECTS OF THE INVENTION As is apparent from the above embodiments, the present invention is directed to an indoor unit having a blower for blowing temperature-controlled air that has been conditioned by a heat exchanger, and an air outlet opening to the upper part of the indoor unit and a lower port opened to the lower part. The air outlet that connects the upper air outlet, the blower, and the lower air outlet, and the air flow dividing means that can arbitrarily change the upper and lower air flow distribution ratios are provided, and the opening of the lower air outlet is the lower space of the double floor. And a ventilation port communicating with the room at the end of the double floor, and a first suction port opened on the front surface of the indoor unit body, a second suction port opened on the lower surface of the indoor unit body, and a second suction port. Is communicated with the lower space of the double floor, and the first suction port and the second suction port are switched according to the cooling / heating operation mode.

In other words, during heating operation, when there is a large difference between the room temperature and the set temperature (when starting the heating operation, etc.), the hot air outlet blows all of the warm air by means of the blow-off diversion means to directly warm the living area and quickly reach the set temperature. Control to approach. Meanwhile, the room temperature rises,
When the temperature approaches the set temperature, the flow diverting means changes the diverting ratio between the upper outlet and the lower outlet so that a part of the warm air is sent out from the lower outlet. As a result, the double floor is gradually warmed, and the effect of heating at the feet gradually appears. Then, when the room temperature in the living area becomes substantially equal to the set temperature, all of the warm air is blown downward by the blow-off flow dividing means, the double floor is warmed by the warm air, and blown out from the ventilation port. As a result, due to the effect of floor heating, it provides an ideal heating space with almost no temperature distribution and a head-and-foot heat type.

On the other hand, during cooling operation, cool air is blown upward from the upper outlet and hits the ceiling, after which it is naturally dropped by the weight of the cool air and sucked in from the ventilation port provided on the opposite side of the indoor unit body. It is possible to send cold air to a distant place, and it is possible to perform high-quality head cold foot heat type air conditioning with uniform temperature distribution and no discomfort due to wind.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an essential part of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a sectional view of a room in which the air conditioner is installed,
3 and 4 are cross-sectional views of the main part of the air conditioner in each operating state, FIG. 5 is a perspective view of a room in which the air conditioner is installed during steady operation during heating, and FIG. FIG. 7 is a flow chart of the operation of the air conditioner, FIG. 7 is a sectional view of the conventional air conditioner during heating, and FIG. 8 is a plan view taken along the line II-II of FIG.
Fig. 8 is a sectional view taken along the line III-III in Fig. 8, Fig. 10 is a sectional view during conventional cooling, Fig. 11 is a plan view taken along the line VV in Fig. 10, and Fig. 12 is a first view.
Fig. 1 is a sectional view taken along line VI-VI, and Fig. 13 is an enlarged sectional view of a portion corresponding to Fig. 8. 25 …… Indoor unit, 27 …… Heat exchanger, 28 …… Blower, 30 ……
Blow-off diversion means, 31 …… Upper outlet, 32 …… Lower outlet, 33…
… Air path, 35 …… First suction port, 36 …… Second suction port, 37 ……
Suction port switching means, 39 ... Double floor, 40 ... Lower space, 41 ...
… Ventilation port.

Claims (2)

[Claims] 1. An upper air outlet opening at an upper portion of an indoor unit having a blower for blowing temperature-controlled air conditioned by a heat exchanger, a lower air outlet opening at a lower portion, an upper air outlet and a blower. An air passage that communicates with the lower outlet, an outlet diverter that can arbitrarily change the shunt ratio of the upper and lower outlet air volumes, and an opening of the lower outlet that communicates with the lower space of the double floor to form a double floor end. In addition to providing a ventilation port on the upstream side of the heat exchanger, the first suction port opening to the front of the indoor unit body, the second suction port opening to the lower surface of the indoor unit, and the second suction port are located at the bottom of the double floor. Communicating with space, first
An air conditioner provided with a suction port switching means capable of arbitrarily selecting a suction port and a second suction port. 2. The air conditioner according to claim 1, wherein the suction port switching means is driven in accordance with a cooling / heating operation mode.