JP2009109097A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner with superior comfortability. <P>SOLUTION: The air conditioner comprises an outdoor unit 1, and an indoor unit 11 connected to the outdoor unit 1. The outdoor unit 1 has a compressor 2, an outdoor heat exchanger 3, an outdoor blower 4, a four-way valve 7, a throttle device 8, an outside air temperature detecting device 10 detecting an outside air temperature, and an outdoor heat exchanger temperature detecting device 9 detecting a temperature of the outdoor heat exchanger 3. The indoor unit 11 has an indoor heat exchanger 13, an indoor blower 12, an indoor suction temperature detecting device 15 detecting a temperature of a room, and an operation setting device 16 setting an indoor temperature. The compressor 2 is controlled in response to a differential temperature of the temperature of the room and a set temperature set by the operation setting device 16. A differential temperature set value controlling the compressor 2 is changed in response to the outside air temperature, and even if the outside air temperature is high and there is influence of radiation heat from the outdoors, a temperature of the whole room can be positively brought closer to the set temperature. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to control of an air conditioner.

A conventional air conditioner determines the operating frequency of a variable capacity compressor (hereinafter referred to as a compressor) according to the difference between the suction temperature and the set temperature, and the difference between the suction temperature and the set temperature is less than a predetermined temperature. The compressor was controlled to be stopped (thermo-off) when the temperature reached (for example, suction temperature−set temperature = −2 ° C. or less) (see, for example, Patent Document 1).
JP 2006-300401 A

  However, in the above-described conventional air conditioner, the compressor is stopped when the difference between the suction temperature and the set temperature is equal to or lower than a predetermined temperature (for example, in the case of cooling, the suction temperature-set temperature = -2 ° C. or less) regardless of the outdoor air temperature. (Thermo-off) was controlled, but in an actual building, it is affected by the radiant heat from the wall due to the outdoor air temperature. Before the set temperature is reached, the compressor may stop (thermo-off), which greatly impairs the comfort of the air conditioner.

  The present invention solves the above-described conventional problems, and an object thereof is to provide an air conditioner that is excellent in comfort.

  In order to solve the above-described conventional problems, an air conditioner according to the present invention includes an outdoor unit, an indoor unit connected via the outdoor unit, a refrigerant liquid pipe, and a refrigerant gas pipe. Machine, outdoor heat exchanger, outdoor blower, four-way valve, throttle device, outdoor air temperature detecting device for detecting outdoor temperature, and outdoor heat exchanger temperature detecting device for detecting the temperature of the outdoor heat exchanger The indoor unit includes an indoor heat exchanger, an indoor blower, an indoor suction temperature detection device that detects the indoor temperature, and an operation setting device that sets an operation mode and an indoor temperature of the indoor unit. In the air conditioner for controlling the compressor according to a temperature difference between an indoor temperature detected by the indoor suction temperature detection device and a set temperature set by the operation setting device, the outdoor suction temperature According to the outside temperature detected by the detector , Which changes the differential temperature set value for controlling the compressor. Even when the outdoor air temperature is high and it is affected by radiant heat from the outside, it is possible to reliably bring the temperature of the entire room close to the set temperature, which is comfortable. It is possible to supply an excellent air conditioner.

The air conditioner of the present invention comprises an outdoor unit, an indoor unit connected via the outdoor unit, a refrigerant liquid pipe, and a refrigerant gas pipe. The outdoor unit includes a compressor, an outdoor heat exchanger, and an outdoor unit. A blower, a four-way valve, a throttling device, an outdoor air temperature detection device that detects outdoor temperature, and an outdoor heat exchanger temperature detection device that detects the temperature of the outdoor heat exchanger, the indoor unit is An indoor heat exchanger, an indoor blower, an indoor suction temperature detection device for detecting an indoor temperature, and an operation setting device for setting an operation mode and an indoor temperature of the indoor unit, and the indoor suction temperature detection device The outdoor blower is controlled by the temperature detected by the outdoor heat exchanger temperature detecting device while controlling the compressor in accordance with a temperature difference between the detected indoor temperature and the set temperature set by the operation setting device. In the air conditioner that controls In accordance with the temperature detected by the outdoor heat exchanger temperature detector and the rotational speed of the outdoor fan, the differential temperature setting value for controlling the compressor is changed. Even when receiving, the temperature of the entire room can be surely brought close to the set temperature, and an air conditioner with excellent comfort can be supplied.

  The air conditioner of the present invention changes the temperature difference between the suction temperature and the set temperature according to the outdoor air temperature, changes the temperature to be thermo-off (lower when the outdoor air temperature is high, lower during heating), By controlling the entire room so as to reliably approach the set temperature, an air conditioner with high comfort can be supplied.

  1st invention consists of an outdoor unit, the indoor unit connected via the said outdoor unit, the refrigerant liquid pipe | tube, and the refrigerant gas pipe | tube, The said outdoor unit is a compressor, an outdoor heat exchanger, an outdoor air blower, A four-way valve, a throttling device, an outdoor air temperature detecting device for detecting an outdoor temperature, and an outdoor heat exchanger temperature detecting device for detecting the temperature of the outdoor heat exchanger. An exchanger, an indoor blower, an indoor suction temperature detection device for detecting an indoor temperature, and an operation setting device for setting an operation mode and an indoor temperature of the indoor unit, which are detected by the indoor suction temperature detection device. In the air conditioner for controlling the compressor according to the difference between the indoor temperature and the set temperature set by the operation setting device, according to the outside air temperature detected by the outdoor suction temperature detection device, Change the differential temperature set value for controlling the compressor Since a high outdoor temperature, even if affected by radiant heat from the outdoor, it is possible to bring the temperature of the entire room to ensure the set temperature, it is possible to supply a good air conditioner in comfort.

  2nd invention consists of an outdoor unit and the indoor unit connected via the said outdoor unit, a refrigerant | coolant liquid pipe | tube, and a refrigerant gas pipe | tube, The said outdoor unit is a compressor, an outdoor heat exchanger, an outdoor air blower, A four-way valve, a throttling device, an outdoor air temperature detecting device for detecting an outdoor temperature, and an outdoor heat exchanger temperature detecting device for detecting the temperature of the outdoor heat exchanger. An exchanger, an indoor blower, an indoor suction temperature detection device for detecting an indoor temperature, and an operation setting device for setting an operation mode and an indoor temperature of the indoor unit, which are detected by the indoor suction temperature detection device. The compressor is controlled according to a difference between the indoor temperature and the set temperature set by the operation setting device, and the outdoor fan is controlled by the temperature detected by the outdoor heat exchanger temperature detection device. In the air conditioning apparatus, the outdoor heat exchange Depending on the temperature detected by the temperature detector and the rotational speed of the outdoor blower, the differential temperature setting value for controlling the compressor is changed, even when the outdoor air temperature is high and affected by radiant heat from the outdoor. The temperature of the entire room can be surely brought close to the set temperature, and an air conditioner excellent in comfort can be supplied.

  The third invention is particularly detected by the outdoor heat exchanger temperature detection device based on the difference between the indoor temperature detected by the indoor suction temperature detection device of the second invention and the set temperature set by the operation setting device. It changes the temperature setting value that controls the outdoor blower according to the temperature that is set, and even when the outdoor air temperature is high and affected by radiant heat from the outside, it is possible to reliably bring the temperature of the entire room close to the set temperature, An air conditioner with excellent comfort can be supplied.

  According to the fourth aspect of the invention, in particular, in accordance with the temperature difference between the indoor temperature detected by the indoor suction temperature detection device of any one of the first to third inventions and the set temperature set by the operation setting device, An air conditioner with excellent comfort that controls the device, and even when the outdoor air temperature is high and it is affected by radiant heat from the outdoor, the temperature of the entire room can be reliably brought close to the set temperature. Can be supplied.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a refrigeration cycle diagram of the air-conditioning apparatus according to the first embodiment of the present invention, FIG. 2 is a flowchart of the air-conditioning apparatus, and Table 1 is a temperature and setting in a room where the air-conditioning apparatus is installed. The table | surface which shows the relationship between the temperature difference with temperature, and a difference temperature signal, Table 2 is a table | surface which shows the thermo-off point of the air conditioning apparatus.

  In FIG. 1, the air conditioner in the present embodiment is composed of an outdoor unit 1 and an indoor unit 11 connected to the outdoor unit 1 through a refrigerant liquid pipe 5 and a refrigerant gas pipe 6. Is provided with a compressor 2, an outdoor heat exchanger 3, an outdoor blower 4, a four-way valve 7 for switching between cooling and heating operations, and a throttle device 8. Furthermore, the outdoor unit 1 is provided with an outdoor heat exchanger temperature detection device 9 that detects the temperature of the outdoor heat exchanger 3 and an outdoor air temperature detection device 10 that detects the outdoor temperature.

On the other hand, the indoor unit 11 includes an indoor fan 12, an indoor heat exchanger 13, an indoor heat exchanger temperature detection device 14 that detects the temperature of the indoor heat exchanger 13, and the room temperature of the room in which the air conditioner is installed. And an operation setting device 16 that can set the operation mode (cooling or heating) desired by the occupant, the room temperature, operation or stop, the air volume and the air direction.

  In the refrigeration cycle of the air conditioner configured as described above, during cooling or dehumidifying operation, the refrigerant discharged from the compressor 2 flows to the outdoor heat exchanger 3 via the four-way valve 7, and the outdoor blower 4 The refrigerant is condensed and liquefied by exchanging heat with outdoor air in the outdoor heat exchanger 3 by driving, and then the refrigerant decompressed by passing through the expansion device 8 evaporates in the indoor heat exchanger 13 and then passes through the refrigerant gas pipe 6. The air is sucked into the compressor 2 again via the four-way valve 7 (the description of heating is omitted).

  Next, control of the air conditioner in the present embodiment will be described with reference to FIG. 2, Table 1, and Table 2.

  When the resident selects cooling or dehumidification with the operation setting device 16 and starts operation at a set temperature Ta (eg, 16 ° C. here) (S1, S2), the indoor unit 11 detects the indoor temperature Thin ( S3), the outdoor unit 1 detects the outdoor temperature Thout (S4), calculates the difference temperature TX between the set temperature Ta and the indoor temperature Thin (S5), and if the indoor temperature Thin is higher than the set temperature Ta, the compressor 2 is started (S6), and then the compressor 2 is controlled to stop when the indoor temperature Thin becomes lower than the set temperature Ta (S8, S9). In the present embodiment, the outdoor temperature Thout is controlled. However, when it is higher than a certain set value (here, for example, 20 ° C.) (S7), control is performed so that the compressor 2 is stopped when the temperature difference TX falls below, for example, −2 ° C. (S10, S11). Description of heating will be omitted.

  As described above, according to the present embodiment, the difference between the suction temperature and the set temperature is changed according to the outdoor air temperature, and the temperature to be thermo-off is changed (if the outdoor air temperature is high, the temperature is lowered during cooling, and the temperature is lowered during heating. ), Even in the case of being affected by radiant heat from the outside, the entire room can surely approach the set temperature, and an air conditioner that improves comfort can be supplied.

(Embodiment 2)
FIG. 3 is a refrigeration cycle diagram of the air conditioner according to the second embodiment of the present invention, FIG. 4 is a flowchart of the air conditioner, and Table 3 is a rotation speed control table of an outdoor fan of the air conditioner. is there. In addition, about the same part as the air conditioning apparatus in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 3, the outdoor unit 1 includes a compressor 2, an outdoor heat exchanger 3, an outdoor fan 4, a refrigerant liquid pipe 5, a refrigerant gas pipe 6, a four-way valve 7 for switching between cooling and heating operations, and a throttle. The apparatus 8 and the outdoor heat exchanger temperature detection apparatus 9 which detects the temperature of the outdoor heat exchanger 3 are provided.

  The rotational speed of the outdoor blower 4 is controlled so that the temperature of the outdoor heat exchanger 3 becomes a constant temperature (here, for example, around 40 ° C. Table 3) during the cooling or dehumidifying operation. In the control method, the energization time X is controlled at a cycle of 1000 msec (the maximum rotation speed is continuous energization, and the minimum rotation speed is 100 msec energization-900 msec stop repetition) (Table 3).

  When the outdoor air temperature is low, the condensation temperature is lowered, and problems such as refrigerant accumulation in the outdoor heat exchanger 3 occur. Therefore, in order to increase the condensation temperature, the rotational speed of the outdoor fan 4 is set to be low. .

  On the other hand, the indoor unit 11 includes an indoor fan 12, an indoor heat exchanger 13, an indoor heat exchanger temperature detection device 14 that detects the temperature of the indoor heat exchanger 13, and an indoor suction temperature detection that detects the room temperature of the room. An apparatus 15 and an operation setting apparatus 16 capable of setting an operation mode (cooling or heating) desired by a resident, a room temperature, operation or stop, an air volume and a wind direction are provided.

  In the refrigeration cycle of the air conditioning apparatus according to the present embodiment configured as described above, the refrigerant discharged from the compressor 2 flows to the outdoor heat exchanger 3 through the four-way valve 7 during the cooling or dehumidifying operation. After the outdoor fan 4 is driven, the outdoor heat exchanger 3 exchanges heat with outdoor air to condense and liquefy the refrigerant, and then the refrigerant decompressed by passing through the expansion device 8 evaporates in the indoor heat exchanger 11. Then, it passes through the refrigerant gas pipe 6 and is again sucked into the compressor 2 through the four-way valve 7 (the description of heating is omitted).

  When the resident selects cooling or dehumidification with the operation setting device 16 and starts operation at a set temperature Ta (for example, 16 ° C. here) (S12, S13), the indoor unit 11 detects the indoor temperature Thin (S14). ), The temperature difference TX between the set temperature Ta and the room temperature Thin is calculated (S15). When the room temperature Thin is higher than the set temperature Ta, the compressor 2 is started to operate (S16), and then the room temperature Thin is set from the set temperature Ta. Although the compressor 2 is controlled to stop when the temperature Thin becomes low (S18, S19), in this embodiment, the energization time X of the outdoor blower 4 is long (here, for example, 500 msec) (S17). ) When the temperature difference TX falls below −2 ° C., the compressor 2 is controlled to stop (S20, S21).

  As described above, when the energization time to the outdoor blower 4 is short, the outdoor temperature is low, when the energization time is long, the outdoor temperature is high, so when the outdoor temperature is high, the compressor 2 is stopped. It is controlled to lower the temperature setting value. Description of heating will be omitted.

  As described above, according to the present embodiment, the difference between the suction temperature and the set temperature is changed according to the outdoor temperature, and the temperature to be thermo-off is changed (when the outdoor temperature is high, the temperature is lowered during cooling, and the temperature is lowered during heating). Even in the case of being affected by radiant heat from outside the room, the entire room can surely approach the set temperature, and an air conditioner that improves comfort can be supplied.

(Embodiment 3)
FIG. 5 is a flowchart of the air-conditioning apparatus according to the third embodiment of the present invention, and Table 4 is a rotation speed control table of the outdoor fan of the air-conditioning apparatus. In addition, since the refrigerating cycle diagram of the air conditioner in the present embodiment is the same as that in the first embodiment, the same portions are denoted by the same reference numerals and the description thereof is omitted.

  When a resident selects cooling or dehumidification with the operation setting device 16 and starts operation at a set temperature Ta (for example, 16 ° C. here) (S22, S23), the indoor unit 11 detects the indoor temperature Thin (S24), The outdoor unit 1 detects the outdoor temperature Thout (S25), calculates the temperature difference TX between the set temperature Ta and the room temperature Thin (S26), and if the room temperature Thin is higher than the set temperature Ta, the operation of the compressor 2 is performed. Is started (S27), but when the differential temperature TX is small (in this case, for example, less than 3 ° C.) and the differential temperature signal DT becomes equal to or higher than T6 (Table 1) (S28), the outdoor heat for controlling the rotational speed of the outdoor fan 4 is started. The value of the temperature value Tcfan of the exchanger 3 is changed (in this case, for example, changed from 40 ° C. to 45 ° C.), and the refrigerating capacity is reduced by reducing the condensing capacity (S29, S30).

  As the room temperature approaches the set temperature Ta, if the compressor 2 is a variable capacity type, the capacity of the compressor 2 can be changed and operation according to the load is possible. This is not possible, and the operation of the compressor 2 is repeatedly turned on and off near the set temperature Ta, so that temperature irregularities in the air conditioning of the room are likely to occur. However, in the present embodiment, as the room temperature approaches the set temperature Ta, the refrigeration capacity is reduced by adjusting the condensation capacity of the outdoor unit 1, so the frequency of turning on and off the compressor 2 near the set temperature Ta decreases. Comfort is improved.

(Embodiment 4)
FIG. 6 is a flowchart of the air-conditioning apparatus according to the fourth embodiment of the present invention. In addition, since the refrigerating cycle diagram of the air conditioner in the present embodiment is the same as that in the first embodiment, the same portions are denoted by the same reference numerals and the description thereof is omitted.

  In FIG. 6, when the resident selects cooling or dehumidification with the operation setting device 16 and starts operation at a set temperature Ta (eg, 16 ° C. here) (S31, S32), the indoor unit 11 detects the indoor temperature Thin. (S33), the outdoor unit 1 detects the outdoor temperature Thout (S34), calculates the difference temperature TX between the set temperature Ta and the indoor temperature Thin (S35), and if the indoor temperature Thin is higher than the set temperature Ta, The operation of the compressor 2 is started (S36), but when the differential temperature TX is small (here, for example, less than 3 ° C.) and the differential temperature signal DT is T6 or more (Table 1) (S37), the flow rate of the expansion device 8 is increased. Increase the refrigeration capacity (S38).

As the room temperature approaches the set temperature Ta, if the compressor 2 is a variable capacity type, the capacity of the compressor 2 can be changed and operation according to the load is possible. However, in the case of a constant speed compressor, the refrigeration capacity can be adjusted. However, the operation of the compressor 2 is repeatedly turned on and off in the vicinity of the set temperature Ta, and the temperature unevenness of the air conditioning in the room is likely to occur. However, in the present embodiment, as the room temperature approaches the set temperature Ta, the flow rate of the expansion device 8 can be adjusted to lower the refrigeration capacity. Therefore, the frequency of ON / OFF of the compressor 2 near the set temperature Ta is reduced. Reduced comfort.

  The air conditioner according to the present invention can reliably bring the temperature of the entire room close to the set temperature, has excellent comfort, and can be applied to various home and commercial air conditioners.

Refrigeration cycle diagram of the air-conditioning apparatus according to Embodiment 1 of the present invention Flow chart of the air conditioner Refrigeration cycle diagram of an air conditioner according to Embodiment 2 of the present invention Flow chart of the air conditioner The flowchart of the air conditioning apparatus in Embodiment 3 of this invention. The flowchart of the air conditioning apparatus in Embodiment 4 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 3 Outdoor heat exchanger 4 Outdoor fan 5 Refrigerant liquid pipe 6 Refrigerant gas pipe 7 Four-way valve 8 Throttle device 9 Outdoor heat exchanger temperature detector 10 Outdoor temperature detector 11 Indoor unit 12 Indoor fan 13 Indoor heat Exchanger 14 Indoor heat exchanger temperature detection device 15 Indoor suction temperature detection device 16 Operation setting device

Claims (4)

An outdoor unit, and an indoor unit connected through the outdoor unit, a refrigerant liquid pipe, and a refrigerant gas pipe. The outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor blower, a four-way valve, and a throttle. Apparatus, an outdoor air temperature detecting device for detecting an outdoor temperature, and an outdoor heat exchanger temperature detecting device for detecting the temperature of the outdoor heat exchanger, wherein the indoor unit includes an indoor heat exchanger and an indoor blower And an indoor suction temperature detection device for detecting the indoor temperature, and an operation setting device for setting the operation mode and the indoor temperature of the indoor unit, and the indoor temperature detected by the indoor suction temperature detection device and the In the air conditioner that controls the compressor according to the temperature difference from the set temperature set by the operation setting device, the compressor is controlled according to the outside air temperature detected by the outdoor suction temperature detecting device. It is characterized by changing the differential temperature set value. Air conditioning apparatus. An outdoor unit, and an indoor unit connected via the outdoor unit, a refrigerant liquid pipe, and a refrigerant gas pipe. The outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor blower, a four-way valve, and a throttle. Apparatus, an outdoor air temperature detecting device for detecting an outdoor temperature, and an outdoor heat exchanger temperature detecting device for detecting the temperature of the outdoor heat exchanger, wherein the indoor unit includes an indoor heat exchanger and an indoor blower And an indoor suction temperature detection device for detecting the indoor temperature, and an operation setting device for setting the operation mode and the indoor temperature of the indoor unit, and the indoor temperature detected by the indoor suction temperature detection device and the In the air conditioner for controlling the compressor according to the temperature difference with the set temperature set by the operation setting device, and controlling the outdoor blower by the temperature detected by the outdoor heat exchanger temperature detection device, The outdoor heat exchanger temperature detection device In the a sensed temperature in accordance with the rotational speed of the outdoor fan, an air conditioning apparatus, characterized in that changing the differential temperature set value for controlling the compressor. The temperature setting value for controlling the outdoor fan based on the temperature detected by the outdoor heat exchanger temperature detection device is determined based on the difference between the indoor temperature detected by the indoor suction temperature detection device and the setting temperature set by the operation setting device. The air conditioner according to claim 2 to be changed. The expansion device is controlled according to any one of claims 1 to 3, wherein the expansion device is controlled in accordance with a temperature difference between the indoor temperature detected by the indoor suction temperature detection device and the set temperature set by the operation setting device. Air conditioner.