JP2558783B2 - Ceiling embedded air conditioner - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an air conditioner, and more particularly to control of the direction of air blown from the air conditioner.

2. Description of the Related Art A conventional technique will be described with reference to FIGS. Reference numeral 1 denotes an indoor unit of a ceiling-embedded air conditioner, which is fixed to a ceiling wall 2 by a fixing bolt 3, and a lower surface of the indoor unit 1 is opened substantially flush with a ceiling 4. The indoor unit 1 is composed of an outer shell 5 and a lower surface grill 6, inside which indoor heat exchangers 7a and 7b of a cooling system are installed, and a blower 8 is installed so that heat can be exchanged with each of them. .

A rectangular inlet 10 is provided at the center of the lower grill 6, and blow grills 11a and 11b are provided around the inlet 10. Approximately half of the air blown out from the blower 8 is
After passing through, it passes through the outlet grill 11a and blows obliquely downward and forward. The remaining air blown from the blower 8 passes through the heat exchanger 7b, passes through the blow grill 11b, and blows obliquely downward and forward.

In addition, movable louvers 12a and 12b are installed to control the direction of each blown air. Further, a remote control type temperature setting means 100 is provided so that the user can set an arbitrary room temperature. Inside the suction port 10, a suction temperature sensor 13 is fixedly installed, which measures the suction temperature and detects a temperature difference from the set temperature by the temperature setting means 100, turns the cooling system on and off, and substantially sets the inside of the room. It is kept uniform.

The operation of the conventional ceiling-embedded air conditioner thus configured will be described.

Generally, the air conditioner of the present invention is often installed on the ceiling of an office, a store, or a living room, and controls the temperature of the room 14.

The chamber 14 is composed of a ceiling 4, side walls 15 and 16, and a floor 17. The space enclosed by the two-dot chain line in FIG. 8 is the living area, and ASHRAE's STANDARD defines a space that is 1800 mm or less in height and 600 mm or more from the side wall as the living area.
In other words, humans are generally defined as living in this residential area.

At this time, as shown in FIG. 8, the stream of the blown air blows the air warmed by the heat exchangers 7a and 7b (cooled at the time of cooling) from the blow grills 11a and 11b downward. After the interior of the room 14 is heated (cooled) so as to draw a large arc in the area, the air is sucked from the central suction port 10 of the indoor unit 1. At this time, the blown airflows a and b have substantially the same blown air volume and blowout direction, and the streamlines of the airflows a and b draw substantially the same arc.

The temperature of the air sucked in this way is determined by the suction temperature sensor.
The temperature of the blown air was adjusted by detecting the temperature by 13, and the average temperature in the living area of the room 14 was maintained at about the set temperature.

Problems to be Solved by the Invention The ceiling of a store, office, or living room is 2.5 to 3 mm from the floor
When the indoor unit is installed at this position, the temperature of the air blown from the indoor unit is sent into the living area to maintain a good temperature distribution. There must be. For this reason, for a person in the vicinity of the outlet, the blowing air may hit the head or face, causing discomfort, or causing a phenomenon that the person feels cold.
There was a problem that a high-level comfortable space could not be provided.

In addition, especially during heating, due to the effect of the specific weight of air, high-temperature air stagnates near the ceiling, which wastes heat near the ceiling above the living area, which is the range of human activity. There was a problem that the heating was bad and the running cost was high.

The present invention calculates the amount of heat load in the room from the set temperature and the blown air temperature and detects both of the blown air temperature change rates, and when either of these is greater than a preset value, the indoor unit The temperature-controlled air is blown out obliquely downward and the air is blown down directly into the living area, and both the heat load calculation result and the blown air temperature change rate calculation result exceed the preset values. It is an object of the present invention to provide an air conditioner that controls to blow out almost horizontally to the ceiling surface when it is small, that is, when it approaches steady operation.

Means for Solving the Problems In order to achieve the above object, the ceiling-embedded air conditioner of the present invention is a blown air temperature detecting means, an indoor temperature setting means, and blown air from the blown air temperature detecting means. Heat load amount calculating means for calculating the heat load amount in the room based on the temperature output and the set temperature output from the room temperature setting means,
Outputs both the blowing air temperature change rate measuring means for measuring the amount of change in the blowing air temperature using the temperature detected by the blowing air temperature detecting means as an input signal, and the blowing air temperature change rate measuring means and the heat load amount calculating means. A blowout angle determination means for determining a blowout angle based on a signal, and a blowout angle switching means for switching the blowout angle to the blowout angle determined by the blowout angle determination means, the blowout angle determination means, the blowout air temperature change If either or both of the blown air temperature change rate which is the output from the rate measuring means and the indoor heat load which is the output from the heat load calculating means is equal to or greater than a preset value, the blowout angle is set. It is set obliquely downward, and when both the rate of change in the temperature of the blown air and the amount of heat load in the room are smaller than a preset value, the air is blown. It is configured to determine a substantially horizontal angles to the ceiling surface and.

Action The present invention has the above-described configuration to detect and calculate the blown air temperature and the set temperature to determine the amount of heat load in the room, and the blown air temperature change rate measuring means to blow out the room temperature within a predetermined time. The air temperature change rate is measured, and if either the heat load amount or the blowout air temperature change rate is large, the blowout angle switching means blows out obliquely downward, and either the heat load amount or the blowout air temperature change rate is measured. When the humor is small, by controlling the blowing angle switching means so that it blows out almost horizontally with the ceiling surface, the heat load amount and blown air temperature change rate are large like at the beginning of operation, and I want to quickly cool and heat the living area. Occasionally, the temperature is adjusted in a short time by ejecting it obliquely forward and downward. When the room temperature becomes stable, the difference between the room temperature and the set temperature becomes smaller and the rate of change in the blown air temperature also becomes smaller, and the blowing angle is made substantially horizontal to the ceiling surface, so strong winds hit people in the living area and cause discomfort. Is generated, and it blows out along the ceiling surface, so it is difficult for the wind speed to slow down, creating a large circulation of the entire room: ceiling → side walls → floor → air conditioner suction port, making the entire room uniform. Control the temperature to. Further, particularly in the heating operation, high-temperature air that tends to accumulate near the ceiling above the living area is carried into the living area by a substantially horizontal blowout flow.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. The description of the same components as the conventional one is omitted,
Only the differences will be described.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which 18 is an indoor temperature setting means, 19 is an outlet air temperature detecting means provided in the outlet grill 11b, and the temperature of the air blown into the chamber 14 is shown. To detect. The temperature signal detected in this way is used as a control device.
Send to 20. The control device comprises a heat load amount calculation means 21, a blowout air temperature change rate measuring means 22, a blowout angle determination means 23, and a blowout angle switching means 23. The heat load amount calculation means 21 calculates the heat load amount based on the temperature signals from the blown air temperature detection means 19 and the indoor temperature setting means 18, and the blown air temperature change rate measurement means 22 calculates the blown air temperature detection means 19 The temperature change rate of the blown air is measured based on the temperature signal from. And blowout angle determination means
The reference numeral 23 determines whether the blowing angle is a blowing angle parallel to the ceiling 4 or a downward blowing angle to the floor surface 17 based on the output signals of the heat load calculating means 21 and the blowing air temperature change rate measuring means 22. Is.

The blowing angle switching means 24a, 24b change the angles of the loopers 12a, 12b based on the blowing angle setting signal sent from the blowing angle judging means 23.

The blowout angle switching means 24a is a pulse motor 26a with a motor shaft 25a having a female thread at the tip as shown in FIG.
And one end pivotally supported on the tip of the louver 12a, and the other end is a louver drive shaft 27a with an external thread cut off.The external thread of the drive shaft 27a of the louver is screwed into the internal thread of the motor shaft 25a. .

Next, the operation of the air conditioner configured as described above will be described using the flowchart of FIG.

After the person using the room 14 turns on the power of the air conditioner 1, the temperature is set to a desired room temperature Tset in step 28, and the operation of the air conditioner is started.

Further, in step 29, the initial blown air temperature T ₀ is detected by the blown air temperature detecting means 19 provided in the substantially central portion of the blowout grill 11b. And the preset time θ
After the time elapses, the blown air temperature T ₁ is again detected by the blown air temperature detecting means 19 (step 30).

Then, at step 31, the heat load amount ΔT _l is calculated by the following equation from both the blown air temperature T ₁ and the set temperature Tset.

ΔT _l = T ₁ −Tset Then, the reference heat load amount Δt _l (here, Δt _l = 20 ° C.) set in advance is compared with the calculated heat load amount ΔT _l . Here, the heat load ΔT _l is the reference heat load Δt _l =
When the temperature is higher than 20 ° C, that is, when the difference between the blown air temperature T ₁ and the set temperature Tset is large, that is, when the room is far from the set temperature, proceed to the No side, and the louvers 12a, 12
It is determined that the angle of b from the ceiling surface should be large (step 32), and the air is blown obliquely downward. On the other hand, the difference ΔT _l between the blown air temperature T ₁ and the set temperature T set is the reference heat load ΔT _l =
If the temperature is lower than 20 ° C, proceed to step 33 on the YES side. In step 33, the outlet air temperature change rate ΔT is calculated by the following equation ΔT = | T ₀ −T ₁ | / θ from the initial outlet air temperature T ₀ and the outlet air temperature T ₁ after a fixed time. Then, in step 34, a preset reference temperature change rate Δt (here, assumed to be 0.2 ° C./min) is compared with the blown air temperature change rate ΔT.
Here, the blown air temperature change rate ΔT is the reference temperature change rate Δ
If it is greater than t, that is, the room 14
If the temperature change is severe and the engine is in the excessive operation period, the process proceeds to YES and it is determined that the angles of the louvers 12a and 12b from the ceiling surface are made large (step 35). Then, the process proceeds to step 36, in which the louvers 12a, 1 are set by the blowing angle switching means 24a, 24b.
Set 2b to a position where it makes a large angle from the ceiling surface. As a result, the angle of the louvers 12a and 12b is set to a larger value during startup such as in the initial stage of operation, or during operation under high load such that the difference between the outside temperature and the room temperature is very large. The temperature-controlled air can be blown directly into the living area, and the living area can be quickly brought close to the set temperature. When the temperature of the chamber 14 approaches the set temperature, the heat load amount ΔT _l and the blown air temperature change rate ΔT gradually decrease, the heat load amount ΔT _l is smaller than the reference heat load amount Δt _l , and the blown air temperature changes. The rate ΔT becomes smaller than the reference temperature change rate Δt. As a result, in step 34, it is judged that the angle of the louvers 12a and 12b is made smaller by advancing to the YES side. Then, the process proceeds to step 38, and the outlet angle switching means 24
The louvers 12a and 12b are driven by a and 24b, and the blowing direction is set to be substantially horizontal to the ceiling surface. Therefore, the air blown out flows along the ceiling 4 as shown in FIG.
Hit the top of 15,16. Then, the collided flow changes to a downward flow and flows downward along the side walls 15 and 16. And after reaching the floor 17, while spreading the floor surface 17,
It is sucked through the suction port 10 of the indoor unit 1 and generates a large circulation in the entire room 14. Therefore, no strong wind is generated in the living area, and the temperature can be softly controlled from the outer shell near the wall of the room 14.

According to the above-mentioned embodiment, when the heat load is large or the rate of change in the blown air temperature is large, that is, at the beginning of operation, the blowing direction is directed toward the front floor surface and the temperature control is performed in the living area. The generated air is fed in steadily to control the temperature so as to reach the desired temperature quickly. On the other hand, when the temperature of the room 14 approaches the set temperature and both the heat load amount ΔT _l and the blowout air temperature change rate ΔT are smaller than the reference value, the blowing direction is a horizontal blowout to the ceiling surface. Generate a flow along. The blown air flows along the ceiling surface, so the wind speed does not easily decrease, and while flowing along the ceiling surface, it reaches the upper ends of the side walls 15, 16 and then flows downward along the side walls 15, 16 toward the floor surface 17. And is sucked into the suction port 10 of the indoor unit 1. As a result, a large circulation is generated in the chamber 14 along the wall surface. That is, when the temperature of the room 14 reaches a substantially stable temperature, the blowout is set near the ceiling outside the living area, and the living area is temperature-controlled from the outer shell. For this reason,
The strong wind does not reach the residential area, eliminating the discomfort caused by the wind. In addition, since the flow is along the wall, the air flow is hard to be decelerated and the circulation is reliably performed, so that a more uniform temperature distribution in the room can be achieved.

Especially during heating, high temperature air tends to stay near the ceiling 4, but the space above the head was wasted. Such high-temperature air is blown out by the horizontal blowing flow and carried into the living area, which enables efficient heating.

Also, not only the difference between the blown air temperature and the indoor set temperature, but also the change rate of the blown air temperature is measured and the blow direction is determined in consideration of the load stability situation in the room, so a more appropriate blow direction can be selected. And comfort is greatly improved.

In this embodiment, the driving of the louvers 12a and 12b is performed by the motor 26.
Although a and 26b are used, it is also possible to drive the louvers 12a and 12b by using a shape memory alloy or the like.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiments, the present invention is configured such that the blown air temperature detecting means and the set temperature detecting means calculate the heat load amount in the room, and the blown air temperature detecting means determines a predetermined value. The blowout air temperature is detected at time intervals of, and the blowout air temperature change rate measuring means measures the temperature change rate of the chamber. When both of the heat load amount and the temperature change rate are smaller than the preset values, the blowout angle switching means controls the blowout to be substantially horizontal to the ceiling surface, and either or either of them is large. In this case, the temperature is controlled so that it blows downward obliquely.Therefore, if the difference between the room temperature and the set temperature is large, or if the temperature change rate is large, such as when the operation is in the initial stage of operation, the temperature-controlled air will be sent more and more into the living area. Then, quickly reach the desired temperature. When the operation is stable, the temperature approaches the set temperature, and the rate of change in the blown air temperature becomes small, a horizontal blowout flow is generated in the non-residential area, and a large convection in the entire room along the ceiling surface is generated.

For this reason, since the blowout airflow does not directly hit the person in the living area, the discomfort caused by the airflow does not occur. Further, since the airflow flows along the ceiling surface, the wind speed is unlikely to decrease, the circulation of the entire room becomes more reliable, and the indoor temperature distribution is significantly improved.

Further, since the temperature of the ceiling surface and the side wall is controlled at the same time, discomfort caused by cold and warm radiation from these surfaces is reduced.

In particular, hot air tends to collect near the ceiling during heating, but horizontal blowing allows the hot air in the upper part to be carried into the living area, enabling more efficient heating.

Also, not only the difference between the blown air temperature and the indoor set temperature, but also the change rate of the blown air temperature is measured and the blow direction is determined in consideration of the load stability situation in the room, so a more appropriate blow direction can be selected. And comfort is greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of the present embodiment, FIG. 3 is a flow chart showing an example of a program for determining a blowing angle, and FIG. FIG. 5 is a diagram showing an indoor air flow during a stand-up operation, FIG. 5 is a diagram showing an indoor air flow during a stable operation (at the time of horizontal blowing), FIG. 6 is a bottom view of a conventional air conditioner, and FIG. 7 is the above air conditioner. 8 is a central sectional view of FIG. 8 and FIG. 8 is a view showing an indoor air flow in a conventional example. 18 …… Indoor temperature setting means, 19 …… Blowout air temperature detecting means, 20 …… Control device, 21 …… Heat load amount calculating means, 22 ……
Temperature change rate measuring means, 23 ... Blowout angle determining means, 24a,
24b ...... Blowout angle switching means.

Claims (1)

(57) [Claims] 1. A heat load in a room based on blown air temperature detecting means, indoor temperature setting means, blown air temperature output from the blown air temperature detecting means and set temperature output from the indoor temperature setting means. A heat load amount calculating means for calculating the amount, a blowout air temperature change rate measuring means for measuring the change amount of the blowout air temperature using the temperature detected by the blowout air temperature detecting means as an input signal, and the blowout air temperature change rate measurement Both the means and the heat load amount calculating means are provided with a blowing angle determining means for determining a blowing angle based on an output signal, and a blowing angle switching means for switching the blowing angle to the blowing angle determined by the blowing angle determining means, The blowout angle determination means is an output from the blowout air temperature change rate measuring means and an output from the blowout air temperature change rate and the heat load amount calculating means. If either or both of the heat load amounts in the interior are equal to or greater than a preset value, the outlet angle is set obliquely downward, and both the outlet air temperature change rate and the heat load amount in the room are preset. If it is smaller than the above value, the air conditioner of the ceiling embedded type is characterized in that the outlet angle is determined to be substantially horizontal to the ceiling surface.