JPH05157320A - Air conditioner - Google Patents

Abstract

PURPOSE:To enable a comfortable heating operation to be always carried out by a method wherein an air blowing direction and an air blowing capability are controlled to be varied in response to the difference between one temperature of an indoor device fixing wall surface temperature sensing means and the other temperature of an indoor device fixing opposed wall surface temperature sensing means and a range of the set temperature for each of the stages. CONSTITUTION:An air conditioner is comprised of an indoor device fixing wall surface temperature sensing means 1 and an indoor device fixing opposed wall surface temperature sensing means 2, and the output signals of these means are inputted to a control means 10. When the heating operation is started, if it is judged that a difference between the set temperature and the indoor temperature is higher than the first set temperature range (4 deg.C) by the first comparing means 5, the heating capability is set to its maximum value, and an air blowing direction changing means 8 and an air blowing capability changing means 9 are controlled in such a way the hot air is directed downwardly. Subsequently, in the case that the temperature difference is approached the second set temperature range (2 deg.C) and the difference between the indoor device fixing wall surface temperature and the indoor device fixing opposed wall surface temperature is judged to be larger than the third set temperature range (5 deg.C) by the second comparing means 6, the hot air blowing is changed over to a forward air blowing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ventilation control of an air conditioner.

[0002]

2. Description of the Related Art A conventional air conditioner will be described with reference to FIGS.

6 and 7 are a cycle diagram and a configuration diagram of an air conditioner. As shown in the figure, the air conditioner comprises a compressor 26, a four-way valve 30, an indoor heat exchanger 21, an expansion valve 29, and an outdoor heat exchanger 27 to form a closed cycle, and the compressor 26 has an inverter drive circuit 31.
This allows variable frequency control. Further, the indoor heat exchanger 21 and the outdoor heat exchanger 27 are provided with an indoor blower 22 and a blower fan 28, respectively, and an outlet 25 is provided with a louver 23 that changes the direction of the blown air. Switching between heating and cooling is performed by a four-way valve 30, and decompression is performed by an expansion valve 29. The indoor heat exchanger 21 is provided with an indoor temperature detecting means 24.

The heat of condensation of the refrigerant gas compressed by the compressor 26 and the heat of vaporization of the refrigerant expanded to a low temperature and low pressure by the expansion valve 29 are used for heating and cooling. When performing the heating operation, the four-way valve 30 is switched as shown by the solid line in the figure. The high-temperature and high-pressure refrigerant gas discharged from the compressor 26 is sent to and condensed in the indoor heat exchanger 21, which functions as a condenser during heating operation. At this time, warm air is blown into the room by the indoor blower 21. The louver 23 can change the blowing direction of this wind. Then, the refrigerant expanded by the expansion valve 29 to the low temperature and low pressure state is evaporated in the outdoor heat exchanger 27 by absorbing heat from the outside air, and then sucked into the compressor 26. In order to increase the efficiency of the heat pump, the temperature of the refrigerant in the indoor heat exchanger 21 is lowered and the evaporation temperature of the refrigerant in the outdoor heat exchanger 27 is raised to reduce the pressure difference before and after the compressor 26. That is, it is only necessary to increase the air flow rate for both the indoor unit and the outdoor unit.

However, when the amount of air blown from the indoor unit is increased during heating operation, the heating capacity is increased, but the temperature of the blown air is lowered, so that a large amount of low-temperature air hits the skin and the comfort during heating is reduced. is there.
Therefore, in the conventional indoor unit of the air conditioner, as shown in FIG. 8, when the heating is started up, the amount of air blown out is increased to increase the heating capacity, and the wind is directed downward so that low temperature and high speed blown air does not hit the occupants. When the indoor temperature approaches the set temperature, the compressor rotation speed is reduced to reduce the heating capacity and then the air flow rate of the indoor unit is reduced, and high-temperature and low-speed warm air is blown toward the front of the indoor unit. For this reason, the occupant can obtain a high feeling of heating without impairing the comfort during heating. In some cases, as shown in FIG. 9, control is performed to narrow the gap between the louvers 23 to increase the wind speed at the time of small air volume to increase the reaching distance of warm air.

In recent years, however, a design has been adopted in which the vertical width of the indoor unit is made small and the horizontal width thereof is made large due to installation restrictions. The indoor unit of this design has a larger opening area of the blowout port than the indoor unit of the conventional design. Therefore, as shown in FIG. 10, in the heating operation near the set temperature, there is a problem that the blowing air velocity is small when the air volume is low and the warm air does not reach the occupants. For this reason, when the amount of air blown out is increased during the above operation, the heating capacity is set to a small value, so the temperature of the blowout drops, and low-temperature and high-speed air is directly applied to the occupants, which reduces comfort during heating. There is. Also, because the air around the indoor unit causes a short circuit, the indoor temperature is erroneously detected and the operation of the heat pump is stopped, and the heating capacity drops. However, there is a problem that the temperature distribution in the room becomes uneven.

[0007]

As described above, in the indoor unit of the heat pump air conditioner having a large width and a large opening area of the outlet, the conventional outlet control method causes the indoor temperature to approach the preset temperature during the heating operation. Since the air volume is reduced by making the blowing direction to the front of the indoor unit, warm air does not reach the occupants, the indoor air creates a short circuit, and the warm air does not reach near the floor surface and the indoor unit mounting wall surface. There is a problem that the temperature distribution becomes non-uniform and the comfort during heating deteriorates.

Therefore, the air conditioner of the present invention eliminates the above-mentioned drawbacks, and even if the room temperature reaches near the set temperature during heating,
The purpose is to continue heating operation without impairing heating comfort.

[0009]

In order to achieve the above object, an air conditioner of the present invention comprises an indoor blower provided in an indoor unit, an indoor temperature detecting means for detecting an indoor temperature, and a blowout by the indoor blower. A first temperature detecting means for detecting the temperature of the indoor unit mounting wall surface provided at a position where the temperature of the wind immediately after the detection can be detected, and a second temperature for detecting the temperature of at least one wall surface other than the indoor unit mounting wall surface. It is characterized in that it is provided with a detection means and a control means for changing a blowing direction according to a temperature difference detected by the first temperature detection means and a temperature difference detected by the second temperature detection means.

Further, the control means is characterized by performing control for changing the blowing capacity according to the temperature difference detected by the first temperature detection means and the temperature difference detected by the second temperature detection means. ..

[0011]

With the above-mentioned structure, the air blowing direction and the air blowing ability are changed according to the temperature difference between the indoor unit mounting wall surface temperature detecting means and the indoor unit mounting-to-wall surface temperature detecting means and the width of the set temperature for each stage. It is possible to continue comfortable heating operation.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings.

Description of the same structure as the conventional one will be omitted, and only different points will be described. FIG. 1 is a control block diagram according to an embodiment of the present invention. The information about the respective temperature differences obtained by the set temperature input means 3 and the indoor temperature detecting means 4, and the indoor unit mounting wall surface temperature detecting means 1 and the indoor unit mounting-to-wall surface temperature detecting means 2 is controlled by the control means 10 to change the blowing direction 8. And the indoor blower that is the blower capacity changing means 9. The control means 10 is composed of a first comparison means 5, a second comparison means 6, and a blowing direction, a blowing amount, and a compressor rotation speed control means 7.
In the first comparison means 5, the set temperature input by the user with the remote controller (set temperature input means 3) and the indoor temperature detection means 4
The difference from the indoor temperature of the suction port of the indoor unit detected in step 1 is compared with a preset temperature range. The second comparing means 6 compares the difference between the temperature detected by the indoor unit mounting wall surface temperature detecting means 1 and the temperature detected by the indoor unit mounting-to-wall surface temperature detecting means 2 with a preset temperature range. By controlling the air flow direction, the air flow rate, and the compressor rotation speed control means 7 according to the first comparison means and the second comparison means, the air flow direction and the air flow capacity are changed.

FIG. 2 is a phase diagram for detecting the indoor unit mounting wall surface temperature and the indoor unit mounting wall surface temperature in the present invention. At least one wall surface (opposite wall surface) other than the indoor unit mounting wall surface temperature detecting means 1 and the indoor unit mounting wall surface temperature detecting means 1 for detecting the temperature of the indoor unit mounting wall surface provided at a position where the temperature of the wind immediately after being blown out by the indoor blower 22 can be detected. The infrared sensor of the indoor unit is used as the indoor unit mounting-to-wall surface temperature detecting means 2 for detecting the temperature of the indoor unit to detect the wall temperature. FIG. 3 shows a flow chart of the air blowing control during the heating operation of the embodiment, and FIG. 4 shows a flow chart of the air blowing control. A specific temperature example will be described below.

When the heating operation is started, the difference between the set temperature and the room temperature is determined by the first comparison means 5 to be the first set temperature range (4 ° C.).
Determine if greater than. If it is below the first set temperature range (if it is warm to some extent from the beginning), the operation of step 13 is performed (step 11). When rising, blown air is blown out below the indoor unit along the wall surface where the indoor unit is attached. At this time, the heating capacity becomes maximum (step 12).

When the room temperature approaches the set temperature within the first set temperature range, the blowing direction is not changed and the blowing rate is reduced. At this time, the heating capacity is appropriately reduced due to the difference in set temperature (step 13).

When the room temperature approaches the set temperature within the second set temperature range (2 ° C.) (step 14)
In addition, the difference between the indoor unit mounting wall surface temperature and the indoor unit mounting-to-wall surface temperature is determined by the second comparing unit 6 to be the third set temperature range (5
Judge whether it is larger or smaller (Step 1)
5). When the difference between the indoor unit mounting wall surface temperature and the indoor unit mounting-to-wall surface temperature is smaller than the third set temperature range, the downward blowing is continued (step 16).

When the difference between the indoor unit mounting wall surface temperature and the indoor unit mounting-to-wall surface temperature is equal to or larger than the third preset temperature range, blown air is blown out toward the front of the indoor unit. Blower volume (step 12)
Or increase (see the dotted line part of the air flow rate graph in Fig. 3). The heating capacity is appropriately reduced according to the difference from the set temperature (step 17). It is determined whether the difference between the indoor unit mounting wall surface temperature and the indoor unit mounting wall surface temperature is within the fourth preset temperature range (3 ° C.) or larger (step 18).

When approaching within the fourth preset temperature range, blown air is blown again to the lower side of the indoor unit along the wall surface where the indoor unit is attached. The fourth set temperature range is smaller than the third set temperature range. The air flow rate is equal to or reduced from (Step 12) (see the dotted line part of the air flow rate graph in Fig. 3).
The air-blowing direction changing means 8 and the air-blowing capacity changing means 9 for appropriately reducing the heating capacity according to the difference from the set temperature are performed (step 19). If it is larger than the fourth set temperature range, the operation of step 17 is repeated. When the set temperature and the room temperature are the same, the operation is stopped (step 20). FIGS. 5A to 5C show the wind speed (length of arrow), wind direction (direction of arrow), and temperature distribution in the room in one embodiment of the present invention.

In the case of (a), the heating capacity is large at the time of start-up, but since the amount of air blown is also large, air of a slightly lower temperature blows out along the wall surface and floor surface, and the occupants in the center of the room are directly exposed to the low temperature air. Heating the entire room while warming the walls and floor without hitting.

In (b), when the room temperature reaches within the first set temperature range, the heating capacity is reduced and the air flow rate is reduced accordingly, so that the air having a low wind speed and a relatively high temperature flows along the wall surface and the floor surface. It's blowing. For this reason, the short circuit state does not occur, the room is further heated from near the floor without directly hitting the occupants, a high feeling of heating is obtained, and comfort is improved.

(C) When the room temperature reaches within the second set temperature range and the difference between the indoor unit mounting wall temperature and the indoor unit mounting-to-wall surface temperature is larger than the third set temperature, the living space and the indoor unit are mounted. In order to further heat the area including the vicinity of the wall surface, the air is blown out in front of the indoor unit with a heating capacity and a blowing temperature equal to or higher than those in the case of (b). For this reason, the occupants in the room are exposed to the air having a high temperature and a low speed and therefore a space between the high heating, thereby achieving a space with a uniform temperature distribution without impairing the comfort.

[0023]

As described above, according to the present invention, since the blowing flow rate and the blowing direction are controlled according to the change of the room temperature during the heating operation, the heating with a uniform room temperature distribution and a high heating comfort for the occupants can be achieved. It becomes possible to provide.

[Brief description of drawings]

FIG. 1 is a control block diagram according to an embodiment of the present invention.

FIG. 2 is a diagram showing how the indoor unit mounting wall temperature and the indoor unit mounting-to-wall surface temperature are detected.

FIG. 3 is a timing chart showing control during heating of the indoor unit according to the embodiment of the present invention.

FIG. 4 is a control flowchart according to an embodiment of the present invention.

FIG. 5 is a diagram showing an indoor temperature distribution during control according to an embodiment of the present invention.

FIG. 6 is a cycle diagram of a conventional air conditioner.

FIG. 7 is a configuration diagram of an indoor unit of a conventional air conditioner.

FIG. 8 is a timing chart showing an example of louver control of an indoor unit of a conventional air conditioner, showing an indoor temperature distribution during control according to an embodiment of the present invention.

FIG. 9 is a diagram showing a ventilation control during heating of an indoor unit of a conventional air conditioner.

FIG. 10 is a diagram showing an indoor temperature distribution during air volume control of an indoor unit of a conventional air conditioner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Indoor unit mounting wall surface temperature detecting means, 2 ... Indoor unit mounting versus wall surface temperature detecting means, 21 ... Indoor heat exchanger, 22 ... Indoor blower, 23 ... Louver, 24 ... Indoor temperature detecting means, 25 ... Outlet, 26 … Compressor, 27… Outdoor heat exchanger, 28
... Blower fan, 29 ... Expansion valve, 30 ... Four-way valve, 31 ...
Inverter drive circuit.

Claims (3)

[Claims] 1. An indoor blower provided in an indoor unit, an indoor temperature detecting means for detecting an indoor temperature, and an indoor unit mounting wall surface temperature provided at a position where the temperature of wind immediately after being blown by the indoor blower can be detected. A first temperature detecting means for detecting the temperature, a second temperature detecting means for detecting a temperature of at least one wall surface other than the indoor unit mounting wall surface, a temperature detected by the first temperature detecting means and the second temperature detecting means. An air conditioner comprising: a control unit that changes a blowing direction according to a temperature difference detected by the temperature detection unit. 2. The control means performs control to change the blowing capacity according to a temperature difference detected by the first temperature detection means and a temperature difference detected by the second temperature detection means. The air conditioner according to claim 1. 3. The control unit controls the wind when the difference between the temperature detected by the first temperature detection unit and the temperature detected by the second temperature detection unit is a preset temperature range or more. The air conditioner according to claim 1, wherein the air conditioner is controlled so that the air is blown forward and the wind is blown downward when the temperature is less than the set temperature range.