JP2002081714A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JP2002081714A JP2002081714A JP2000273420A JP2000273420A JP2002081714A JP 2002081714 A JP2002081714 A JP 2002081714A JP 2000273420 A JP2000273420 A JP 2000273420A JP 2000273420 A JP2000273420 A JP 2000273420A JP 2002081714 A JP2002081714 A JP 2002081714A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- heat exchanger
- air conditioner
- frequency
- defrosting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、暖房運転、除霜
運転等を行うことが可能な空気調和機に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner capable of performing a heating operation, a defrosting operation, and the like.
【0002】[0002]
【従来の技術】従来から使用されている空気調和機で
は、圧縮機、室外熱交換器、減圧機構、室内熱交換器を
その冷媒回路中に備え、室外熱交換器を蒸発器として機
能させると共に、室内熱交換器を凝縮器として機能させ
ることによって暖房運転を行うことができるようになっ
ている。このとき上記暖房運転を継続して行うと、気温
の低い屋外で蒸発器として機能する室外熱交換器に着霜
が生じる。この際、生じた着霜をそのまま放置しておく
と室外熱交換器の熱交換効率が低下するので、このよう
な場合、上記空気調和機では除霜運転を行うようにして
いる。2. Description of the Related Art A conventional air conditioner is provided with a compressor, an outdoor heat exchanger, a pressure reducing mechanism, and an indoor heat exchanger in a refrigerant circuit thereof, and the outdoor heat exchanger functions as an evaporator. The heating operation can be performed by making the indoor heat exchanger function as a condenser. At this time, if the heating operation is continued, frost is formed on the outdoor heat exchanger that functions as an evaporator outdoors where the temperature is low. At this time, if the generated frost is left as it is, the heat exchange efficiency of the outdoor heat exchanger decreases, and in such a case, the air conditioner performs the defrosting operation.
【0003】除霜運転とは、一般に室内熱交換器から室
内へ放出するはずであった熱量を室外熱交換器に付与す
ることにより、室外熱交換器に生じた着霜を溶融し、除
去しようとするものである。また、このような除霜運転
は、室外熱交換器に設けたサーミスタによって検知した
室外熱交換器温度を所定の除霜開始熱交換器温度と比較
し、上記室外熱交換器温度が除霜開始熱交換器温度より
も低くなったときに、除霜要求があったと判断して開始
されるようになっている。[0003] Defrosting operation is to melt and remove frost generated in the outdoor heat exchanger by giving the amount of heat that should have been generally released from the indoor heat exchanger to the room to the outdoor heat exchanger. It is assumed that. Further, in such a defrosting operation, the outdoor heat exchanger temperature detected by a thermistor provided in the outdoor heat exchanger is compared with a predetermined defrost start heat exchanger temperature, and the outdoor heat exchanger temperature is defrosted. When the temperature becomes lower than the heat exchanger temperature, it is determined that there is a defrost request, and the process is started.
【0004】[0004]
【発明が解決しようとする課題】ところで従来では、上
記除霜運転時における圧縮機の運転周波数は、いかなる
環境条件下においても等しい運転周波数で除霜運転が行
われていた。すなわち、外気温度が、例えば−5℃以上
のときに融け残りがないように予め規定された運転周波
数が用いられていた。しかしながら、実使用上、極低温
(例えば、−10〜−20℃)の地域では、上記の想定
した環境条件以上に霜を融かす耐力が必要となるため、
設計時の想定以上に除霜時間が延びてしまうという問題
がある。また、このような除霜時間の延長は、上記した
ように、その間、室内への熱量の供給が行われないこと
を示しているため、室温低下の原因にもなる。Heretofore, conventionally, the defrosting operation has been performed at the same operating frequency under the above-mentioned defrosting operation under any environmental conditions. That is, a predetermined operating frequency is used so that there is no residual melting when the outside air temperature is, for example, −5 ° C. or more. However, in actual use, in an area of extremely low temperature (for example, -10 to -20 ° C), a resistance to melt frost more than the above assumed environmental conditions is required,
There is a problem that the defrosting time is longer than expected at the time of design. In addition, such an extension of the defrosting time indicates that the supply of heat to the room is not performed during that time as described above, and thus causes a decrease in room temperature.
【0005】さらに上記除霜時間を延長させないため
に、予め除霜運転時における圧縮機の運転周波数を高め
に設定しておくと、極低温ではない通常の外気温度時に
過度の室外機圧縮機音や、室内機冷媒通過音が発生して
しまうという問題も生じている。In order to prevent the defrosting time from being extended, if the operating frequency of the compressor during the defrosting operation is set to a high value in advance, an excessive outdoor unit compressor noise is generated at a normal outside air temperature which is not extremely low. Also, there is a problem that the indoor unit refrigerant passing sound is generated.
【0006】この発明は上記従来の欠点を解決するため
になされたものであり、その目的は、外気温度や設置場
所の環境に応じて効率良く除霜運転を行うことが可能な
空気調和機を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide an air conditioner capable of efficiently performing a defrosting operation according to the outside air temperature and the environment of an installation place. To provide.
【0007】[0007]
【課題を解決するための手段】そこで請求項1の空気調
和機は、圧縮機2と室外熱交換器3と減圧機構4とを有
し、暖房運転時に蒸発器として機能する室外熱交換器3
への着霜を除霜可能に構成した空気調和機において、外
気温度doaが基準温度DOALO未満であれば、圧縮
機2の運転周波数を基準運転周波数よりも高い運転周波
数で除霜運転することを特徴としている。Therefore, an air conditioner according to the present invention has a compressor 2, an outdoor heat exchanger 3, and a pressure reducing mechanism 4, and functions as an evaporator during a heating operation.
When the outside air temperature doa is lower than the reference temperature DOALO, in the air conditioner configured to be capable of defrosting the frost on the compressor 2, the defrosting operation of the compressor 2 is performed at an operation frequency higher than the reference operation frequency. Features.
【0008】上記請求項1の空気調和機では、外気温度
doaが基準温度DOALO未満であれば、圧縮機2の
運転周波数を基準運転周波数よりも高い運転周波数で除
霜運転するようにしている。このように外気温度doa
が低い場合に、圧縮機2の運転周波数を上げて除霜性能
を高めるよう制御したことによって、その時の外気温度
doaに応じた除霜運転を行うことが可能になると共
に、除霜時間の短縮化を図ることができる。In the air conditioner of the first aspect, if the outside air temperature doa is lower than the reference temperature DOALO, the compressor 2 is operated to perform a defrosting operation at an operation frequency higher than the reference operation frequency. Thus, the outside air temperature doa
When the temperature is low, the operating frequency of the compressor 2 is increased to control the defrosting performance, so that the defrosting operation according to the outside air temperature doa at that time can be performed, and the defrosting time can be reduced. Can be achieved.
【0009】また請求項2の空気調和機は、圧縮機2と
室外熱交換器3と減圧機構4とを有し、暖房運転時に蒸
発器として機能する室外熱交換器3への着霜を除霜可能
に構成した空気調和機において、除霜運転時における圧
縮機2の運転周波数を第1基準運転周波数で行うか、あ
るいは第1基準運転周波数よりも高く設定される第2基
準運転周波数で行うかを手動設定可能に構成したことを
特徴としている。An air conditioner according to a second aspect of the present invention has a compressor 2, an outdoor heat exchanger 3, and a pressure reducing mechanism 4, and removes frost on the outdoor heat exchanger 3 functioning as an evaporator during a heating operation. In the air conditioner configured to allow frost, the operation frequency of the compressor 2 during the defrosting operation is performed at the first reference operation frequency or at the second reference operation frequency set higher than the first reference operation frequency. It is characterized in that it can be manually set.
【0010】上記請求項2の空気調和機では、除霜運転
時における圧縮機2の運転周波数を第1基準運転周波数
で行うか、あるいは第1基準運転周波数よりも高く設定
される第2基準運転周波数で行うかを手動設定可能に構
成している。この結果、空気調和機を設置した場所の環
境条件に応じて、除霜運転時の運転周波数を選択するこ
とが可能となる。これより、例えば上記空気調和機を寒
冷地域や豪雪地域に設置する場合は、予め、通常よりも
高い運転周波数を有する第2基準運転周波数に設定して
おくことによって、除霜時間の短縮化を図ることができ
る。In the air conditioner of the second aspect, the operation frequency of the compressor 2 during the defrosting operation is set to the first reference operation frequency or the second reference operation is set to be higher than the first reference operation frequency. It is configured to be able to manually set whether to perform with frequency. As a result, it becomes possible to select an operation frequency at the time of the defrosting operation according to the environmental condition of the place where the air conditioner is installed. Accordingly, for example, when the air conditioner is installed in a cold region or a heavy snowfall region, the defrosting time can be reduced by previously setting the second reference operation frequency having an operation frequency higher than usual. Can be planned.
【0011】また請求項3の空気調和機は、圧縮機2と
室外熱交換器3と減圧機構4とを有し、暖房運転時に蒸
発器として機能する室外熱交換器3への着霜を除霜可能
に構成した空気調和機において、除霜運転時における圧
縮機2の運転周波数を第1基準運転周波数で行うか、あ
るいは第1基準運転周波数よりも高く設定される第2基
準運転周波数で行うかを手動設定可能に構成すると共
に、外気温度doaが基準温度DOALO未満であれ
ば、圧縮機2の運転周波数を上記各基準運転周波数より
もさらに高い運転周波数で除霜運転することを特徴とし
ている。An air conditioner according to a third aspect of the present invention includes a compressor 2, an outdoor heat exchanger 3, and a pressure reducing mechanism 4, and removes frost on the outdoor heat exchanger 3 functioning as an evaporator during a heating operation. In the air conditioner configured to allow frost, the operation frequency of the compressor 2 during the defrosting operation is performed at the first reference operation frequency or at the second reference operation frequency set higher than the first reference operation frequency. In addition to the above configuration, if the outside air temperature doa is lower than the reference temperature DOALO, the operation frequency of the compressor 2 is defrosted at an operation frequency higher than each of the reference operation frequencies. .
【0012】上記請求項3の空気調和機では、設置場所
の環境条件に応じて圧縮機2の運転周波数を手動設定す
ることが可能であると共に、その時の外気温度doaに
応じても運転周波数が可変可能に構成されているため、
より適切な運転周波数で除霜運転を行うことができると
共に、除霜時間の短縮化を図ることもできる。In the air conditioner according to the third aspect, the operating frequency of the compressor 2 can be manually set in accordance with the environmental conditions of the installation location, and the operating frequency can be set in accordance with the outside air temperature doa at that time. Because it is configured to be variable,
The defrosting operation can be performed at a more appropriate operation frequency, and the defrosting time can be shortened.
【0013】さらに請求項4の空気調和機は、上記圧縮
機2の運転周波数を増加させたときに、上記減圧機構4
の開度を増加させることを特徴としている。Further, in the air conditioner according to the fourth aspect, when the operating frequency of the compressor 2 is increased, the pressure reducing mechanism 4
The feature is to increase the opening degree.
【0014】上記請求項4の空気調和機では、運転周波
数の増加と共に減圧機構4の開度も増加させている。こ
れによって、循環量を増やすことができるため、上記除
霜性能をより高めることができ、さらなる除霜時間の短
縮化を図ることができる。In the air conditioner according to the fourth aspect, the opening of the pressure reducing mechanism 4 is increased with an increase in the operating frequency. Thereby, since the circulation amount can be increased, the defrosting performance can be further improved, and the defrosting time can be further reduced.
【0015】[0015]
【発明の実施の形態】次に、この発明の空気調和機の具
体的な実施の形態について、図面を参照しつつ詳細に説
明する。図1は、本発明の一実施の形態である空気調和
機1の構成を示す冷媒回路図である。Next, specific embodiments of the air conditioner of the present invention will be described in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram illustrating a configuration of an air conditioner 1 according to an embodiment of the present invention.
【0016】図1に示すように、上記空気調和機1は、
圧縮機2、室外熱交換器3、電動膨張弁4(減圧機
構)、室内熱交換器5を備えるヒートポンプ式の空気調
和機であり、圧縮機2からの冷媒が循環されるように冷
媒回路が構成されている。すなわち、圧縮機2の吐出側
2aと吸込側2bとは、それぞれ四路切換弁6の1次ポ
ートに接続されている。そして、四路切換弁6の2次ポ
ートの一方から室外ファン8を付設している室外熱交換
器3、電動膨張弁4、室内ファン9を付設している室内
熱交換器5をそれぞれ経由して四路切換弁6の他方の2
次ポートへ至る冷媒回路が冷媒配管によって構成されて
いる。そして、四路切換弁6からは、アキュムレータ7
を介して圧縮機2の吸込側2bに戻るようになってい
る。また上記室外熱交換器3には室外熱交換器温度を検
知するための室外熱交温度サーミスタ10が付設され、
さらに屋外には外気温度doaを検知するための外気温
度サーミスタ(図示せず)が設けられている。As shown in FIG. 1, the air conditioner 1 includes:
It is a heat pump type air conditioner including a compressor 2, an outdoor heat exchanger 3, an electric expansion valve 4 (decompression mechanism), and an indoor heat exchanger 5, and a refrigerant circuit is provided so that refrigerant from the compressor 2 is circulated. It is configured. That is, the discharge side 2a and the suction side 2b of the compressor 2 are connected to the primary ports of the four-way switching valve 6, respectively. Then, one of the secondary ports of the four-way switching valve 6 passes through the outdoor heat exchanger 3 provided with the outdoor fan 8, the electric expansion valve 4, and the indoor heat exchanger 5 provided with the indoor fan 9, respectively. Of the four-way switching valve 6
The refrigerant circuit leading to the next port is constituted by a refrigerant pipe. Then, from the four-way switching valve 6, the accumulator 7
To return to the suction side 2b of the compressor 2 via the. The outdoor heat exchanger 3 is provided with an outdoor heat exchange temperature thermistor 10 for detecting the temperature of the outdoor heat exchanger.
Further, an outdoor temperature thermistor (not shown) for detecting the outdoor temperature doa is provided outdoors.
【0017】上記空気調和機1の冷媒回路において冷房
運転及び暖房運転を行う場合について説明する。すなわ
ち上記冷暖房運転の際には、電動膨張弁4を所定の開度
に調整すると共に、室外ファン8及び室内ファン9を所
定の回転数で駆動する。そして、冷房運転を行う場合
は、圧縮機2からの吐出冷媒を実線矢印に示すように循
環させ、室外熱交換器3を凝縮器として機能させると共
に、室内熱交換器5を蒸発器として機能させることによ
って室内空気の冷却を行う。また、暖房運転を行う場合
は、圧縮機2からの吐出冷媒を破線矢印に示すように循
環させ、室内熱交換器5を凝縮器として機能させると共
に、室外熱交換器3を蒸発器として機能させることによ
って、室内空気の加熱を行うように構成している。A case in which a cooling operation and a heating operation are performed in the refrigerant circuit of the air conditioner 1 will be described. That is, during the cooling / heating operation, the electric expansion valve 4 is adjusted to a predetermined opening degree, and the outdoor fan 8 and the indoor fan 9 are driven at a predetermined rotation speed. When performing the cooling operation, the refrigerant discharged from the compressor 2 is circulated as indicated by a solid arrow, and the outdoor heat exchanger 3 functions as a condenser and the indoor heat exchanger 5 functions as an evaporator. This cools the indoor air. In the case of performing the heating operation, the refrigerant discharged from the compressor 2 is circulated as indicated by a dashed arrow, and the indoor heat exchanger 5 functions as a condenser and the outdoor heat exchanger 3 functions as an evaporator. Thereby, it is configured to heat the indoor air.
【0018】ところで、上記のような暖房運転を継続し
て行うと、気温の低い屋外で蒸発器として機能する室外
熱交換器3に着霜が生じる。この着霜を放置すると室外
熱交換器3の熱交換能力が低下するので、このような場
合には、自動的に除霜運転が行われるように制御されて
いる。ここで、本実施形態における除霜運転について説
明すると、上記暖房運転中に、室外熱交換器3に付設さ
れた室外熱交温度サーミスタ10によって検知された室
外熱交換器温度と、予め設定された除霜開始熱交換器温
度(例えば、−12℃)との比較を行い、上記室外熱交
換器温度が除霜開始熱交換器温度以下となったときに、
除霜要求があったと判断して除霜運転が行われるように
構成されている。そして上記除霜運転は、図1の冷媒回
路における室外ファン8と室内ファン9とを停止させる
と共に、四路切換弁6を実線方向に切替えて室外熱交換
器3に圧縮機2からの吐出ガス冷媒を供給することによ
る逆サイクル除霜運転で行われる。このとき、上記除霜
運転時における圧縮機2の運転周波数は、以下で詳細に
述べるように、外気温度doaや設置場所の環境条件に
基づいて切換設定可能なように構成されている。By the way, if the above-described heating operation is continuously performed, frost is formed on the outdoor heat exchanger 3 which functions as an evaporator outdoors at low temperatures. If the frost is left untreated, the heat exchange capacity of the outdoor heat exchanger 3 is reduced. In such a case, the control is performed so that the defrosting operation is automatically performed. Here, the defrosting operation in the present embodiment will be described. During the heating operation, the outdoor heat exchanger temperature detected by the outdoor heat exchange temperature thermistor 10 attached to the outdoor heat exchanger 3 is set in advance. A comparison with the defrost start heat exchanger temperature (for example, -12 ° C) is performed, and when the outdoor heat exchanger temperature becomes equal to or lower than the defrost start heat exchanger temperature,
The defrosting operation is performed when it is determined that a defrost request has been made. In the defrosting operation, the outdoor fan 8 and the indoor fan 9 in the refrigerant circuit of FIG. 1 are stopped, and the four-way switching valve 6 is switched in the solid line direction to supply the outdoor heat exchanger 3 with the discharged gas from the compressor 2. It is performed in a reverse cycle defrosting operation by supplying a refrigerant. At this time, the operating frequency of the compressor 2 during the defrosting operation is configured to be switchable and set based on the outside air temperature doa and the environmental conditions of the installation location, as described in detail below.
【0019】上記除霜運転時における圧縮機2の運転周
波数制御について説明する。図2に上記運転周波数制御
を説明するための説明図を示す。図は外気温度doaや
設置場所の環境条件に応じて切換設定される運転周波数
の仮定数を示しており、、は外気温度doaを考慮した
場合の運転周波数を、は設置場所を考慮した場合の運転
周波数を、または上記外気温度doaと設置場所との両
方を考慮した場合における運転周波数をそれぞれ示して
いる。The operation frequency control of the compressor 2 during the defrosting operation will be described. FIG. 2 is an explanatory diagram for explaining the operation frequency control. The figure shows the assumed number of operating frequencies that are switched and set according to the outside air temperature doa and the environmental conditions of the installation location, where indicates the operating frequency when the outside air temperature doa is considered, and indicates the operating frequency when the installation location is considered. The operating frequency or the operating frequency when both the outside air temperature doa and the installation location are considered are shown.
【0020】まず、外気温度doaに基づく運転周波数
制御について説明する。上記暖房運転時において除霜運
転開始指令が出されると、外気温度サーミスタで検知さ
れる外気温度doaが、予め設定された基準温度DOA
LO(例えば、0℃)よりも低いか否かの判断が行われ
る。ここで、上記外気温度doaが基準温度DOALO
以上である場合は、通常除霜時の運転周波数である第1
基準運転周波数(例えば、70Hz)で除霜運転が行わ
れ、逆に外気温度doaの方が低い場合は、上記第1基
準運転周波数よりも高い運転周波数を有する第2基準運
転周波数(例えば、74Hz)で除霜運転が行われるよ
うに制御されている。First, the operation frequency control based on the outside air temperature doa will be described. When a defrosting operation start command is issued during the heating operation, the outside air temperature doa detected by the outside air temperature thermistor is changed to a preset reference temperature DOA.
A determination is made whether the temperature is below LO (eg, 0 ° C.). Here, the outside air temperature doa is equal to the reference temperature DOALO.
If the above is the case, the first operation frequency, which is the operation frequency during normal defrosting,
When the defrosting operation is performed at the reference operation frequency (for example, 70 Hz) and the outside air temperature doa is lower, the second reference operation frequency (for example, 74 Hz) having an operation frequency higher than the first reference operation frequency is used. ) Is controlled so that the defrosting operation is performed.
【0021】次に、上記空気調和機1が設置される場所
の環境条件に基づく運転周波数制御について説明する。
本実施形態では、空気調和機1を極低温(例えば、−1
0℃から−20℃)の寒冷地域や極低温ではないが豪雪
地域に設置した場合と、極低温ではない普通の地域に設
置した場合に、基準となる除霜時の運転周波数の切換設
定を手動で行うことができるように構成している。すな
わち、普通の地域に設置した場合は第1基準運転周波数
(例えば、70Hz)を、また寒冷地域や豪雪地域に設
置した場合は、上記第1基準運転周波数よりも高く設定
された第2基準運転周波数(例えば、78Hz)を選択
することができるように構成されている。具体的な切換
方法としては、例えば、図示しない制御用プリント基板
上に、電気的なON/OFF切換が可能なジャンパ線等
を設けておき、このジャンパ線を切断するか否かによっ
て、上記運転周波数の切換えができるようにしている。
つまり、このジャンパ線が電気的に接続されている状態
(ON状態)では、第1基準運転周波数で除霜運転が行
われ、ジャンパ線が切断された状態(OFF状態)で
は、第2基準運転周波数で除霜運転が行われるように設
定されている。Next, operation frequency control based on environmental conditions of a place where the air conditioner 1 is installed will be described.
In the present embodiment, the air conditioner 1 is operated at an extremely low temperature (for example, -1).
(0 ° C to -20 ° C) in a cold region or a very heavy snow region where the temperature is not extremely low, and when it is installed in a normal region where the temperature is not extremely low, the standard operation frequency for defrosting is set. It is configured so that it can be performed manually. That is, the first reference operation frequency (for example, 70 Hz) is set in a normal area, and the second reference operation frequency set higher than the first reference operation frequency is set in a cold area or a heavy snowfall area. The frequency (for example, 78 Hz) is configured to be selectable. As a specific switching method, for example, a jumper wire or the like that can be electrically turned on / off is provided on a control printed circuit board (not shown), and the above operation is performed depending on whether the jumper wire is cut or not. The frequency can be switched.
That is, when the jumper wire is electrically connected (ON state), the defrosting operation is performed at the first reference operating frequency, and when the jumper wire is cut (OFF state), the second reference operation frequency is used. It is set so that the defrosting operation is performed at the frequency.
【0022】また、上記した外気温度doaと設置場所
の環境条件との両方を考慮して運転周波数を制御するこ
とも可能である。この場合、上記圧縮機2の運転周波数
は、上記で述べた運転周波数制御において設定されたど
の運転周波数よりも、さらに高い運転周波数(例えば、
82Hz)で除霜運転が行われるように制御されてい
る。なお、このような除霜運転は、上記室外熱交換器温
度が予め設定された除霜運転終了熱交換器温度に達する
か、あるいは予め設定された除霜時間が経過した時に終
了され、その後再び暖房運転に戻るように制御されてい
る。It is also possible to control the operating frequency in consideration of both the outside air temperature doa and the environmental conditions of the installation place. In this case, the operating frequency of the compressor 2 is higher than any of the operating frequencies set in the above-described operating frequency control (for example,
(82 Hz). Note that such a defrosting operation is terminated when the outdoor heat exchanger temperature reaches a preset defrosting operation end heat exchanger temperature or when a preset defrosting time has elapsed, and thereafter, again. It is controlled to return to the heating operation.
【0023】図3に、上記除霜運転時における圧縮機2
の運転周波数の切換制御を行うための制御フローチャー
トを示す。まずステップS1において除霜運転開始指令
が出されると、ステップS2に移行して、圧縮機2の運
転周波数の補正量であるa及びbの値に0を代入する。
次にステップS3では、外気温度サーミスタで検知され
た外気温度doaが、予め設定された基準温度DOAL
O(例えば、0℃)未満であるか否かの判断を行う。こ
こで、外気温度doaの方が低い場合は、ステップS4
に移行して補正量aをa=4(Hz)とし、その後ステ
ップS5に移行する。一方、ステップS3において、上
記外気温度doaが基準温度DOALO以上である場合
もステップS5に移行する。ステップS5では、上記運
転周波数の手動設定が行われているか否かについての判
断が行われる。ここで、手動設定が行われている場合
は、ステップS6に移行して補正量bをb=8(Hz)
とし、その後ステップS7に移行する。一方、ステップ
S5において、手動設定が行われていない場合もステッ
プS7に移行する。ステップS7では、通常の除霜運転
を行う場合に設定される第1基準運転周波数(例えば、
70Hz)に、上記補正量であるa及びbの値を加え
て、これを新たな圧縮機2の運転周波数として除霜運転
を開始するよう制御されている。FIG. 3 shows the compressor 2 during the defrosting operation.
4 is a control flowchart for performing the switching control of the operating frequency of FIG. First, when a defrosting operation start command is issued in step S1, the process proceeds to step S2, where 0 is substituted for the values of a and b that are correction amounts of the operating frequency of the compressor 2.
Next, in step S3, the outside air temperature doa detected by the outside air temperature thermistor is changed to a predetermined reference temperature DOAL.
It is determined whether it is less than O (for example, 0 ° C.). Here, if the outside air temperature doa is lower, step S4
Then, the correction amount a is set to a = 4 (Hz), and then the process proceeds to step S5. On the other hand, if the outside air temperature doa is equal to or higher than the reference temperature DOALO in step S3, the process also proceeds to step S5. In step S5, a determination is made as to whether the manual setting of the operating frequency has been performed. If the manual setting has been performed, the process proceeds to step S6, and the correction amount b is set to b = 8 (Hz).
Then, the process proceeds to step S7. On the other hand, if the manual setting has not been performed in step S5, the process also proceeds to step S7. In step S7, a first reference operation frequency (for example,
(70 Hz), the values of a and b, which are the above-mentioned correction amounts, are added, and this is set as a new operating frequency of the compressor 2 so that the defrosting operation is started.
【0024】以上のように上記空気調和機1の実施形態
によれば、外気温度サーミスタで検知される外気温度d
oaが基準温度DOALO未満であれば、圧縮機2の運
転周波数を通常の基準運転周波数よりも高い運転周波数
で除霜運転するようにしている。このように外気温度d
oaが低い場合に、上記圧縮機2の運転周波数を上げて
除霜性能を高めるよう制御したことによって、その時の
外気温度doaに応じた除霜運転を行うことが可能にな
ると共に、除霜時間の短縮化を図ることができる。ま
た、除霜運転時における運転周波数を第1基準運転周波
数で行うか、それよりも高く設定された第2基準運転周
波数で行うかを手動で切換設定できるように構成したこ
とによって、寒冷地域や豪雪地域に設置した場合は、通
常よりも高い第2基準運転周波数を選択して除霜運転す
ることができるようになるため、設置場所の環境条件に
応じた除霜運転を行うことが可能になると共に、除霜時
間の短縮化を図ることができる。またこのような切換設
定を可能にしたことによって、寒冷地域等に設置する場
合を考えて、全ての空気調和機1の除霜運転時における
運転周波数を高めに設定をしておくという必要がなくな
るため、これによって引き起こされていた室外機圧縮機
音や室内機冷媒通過音を抑制することもできる。As described above, according to the embodiment of the air conditioner 1, the outside air temperature d detected by the outside air temperature thermistor is obtained.
If oa is lower than the reference temperature DOALO, the operation frequency of the compressor 2 is defrosted at an operation frequency higher than the normal reference operation frequency. Thus, the outside air temperature d
When oa is low, by controlling the operating frequency of the compressor 2 to increase the defrosting performance, the defrosting operation can be performed according to the outside air temperature doa at that time, and the defrosting time can be reduced. Can be shortened. In addition, the configuration is such that the operation frequency at the time of the defrosting operation is set to be the first reference operation frequency or the second reference operation frequency set higher than the first reference operation frequency, so that it can be manually switched and set. When installed in a heavy snowfall area, it becomes possible to perform a defrosting operation by selecting a second reference operation frequency higher than usual, so that it is possible to perform a defrosting operation according to the environmental conditions of the installation location. In addition, the defrosting time can be reduced. Further, by enabling such a switching setting, it is not necessary to set a higher operating frequency during the defrosting operation of all the air conditioners 1 in consideration of installation in a cold region or the like. Therefore, the outdoor unit compressor sound and the indoor unit refrigerant passage sound caused by this can be suppressed.
【0025】次に、上記空気調和機1の実施形態での電
動膨張弁4の制御方法について説明する。すなわち本実
施の形態では、除霜運転時に、上記した運転周波数制御
に加えて電動膨張弁4の開度調整制御も併せて行うよう
にしている。すなわち、上記圧縮機2の運転周波数を増
加させる制御が行われたときには、電動膨張弁4の開度
もそれに応じて大きくするように制御されている。この
結果、冷媒回路を流れる冷媒の循環量を増加することが
できるため、これによって上記除霜性能をより高めるこ
とができ、さらなる除霜時間の短縮を図ることができ
る。Next, a method for controlling the electric expansion valve 4 in the embodiment of the air conditioner 1 will be described. That is, in the present embodiment, during the defrosting operation, the opening degree control of the electric expansion valve 4 is also performed in addition to the operation frequency control described above. That is, when the control for increasing the operating frequency of the compressor 2 is performed, the opening of the electric expansion valve 4 is controlled to be increased accordingly. As a result, the circulation amount of the refrigerant flowing through the refrigerant circuit can be increased, whereby the defrosting performance can be further improved, and the defrosting time can be further reduced.
【0026】以上にこの発明の具体的な実施の形態につ
いて説明したが、この発明は上記形態に限定されるもの
ではなく、この発明の範囲内で種々変更して実施するこ
とができる。すなわち本実施の形態では、圧縮機2の運
転周波数や電動膨張弁4の開度を制御することによって
除霜時間の短縮化を図ったが、この他、霜の融け残りを
回避するような制御を併せ持たせること、すなわち除霜
時間を通常よりも少し長く設定したり、除霜運転終了熱
交換器温度を通常よりも高く設定したりするような制御
を併せて実施することも可能である。また、上記実施の
形態では、逆サイクル除霜運転を行う場合を例にとって
述べたが、その他の方法による除霜運転、例えば、圧縮
機2から室外熱交換器3に通じるバイパス通路を設け、
このバイパス通路を通してホットガスを供給することに
よる除霜運転等に、上記制御を適用することも可能であ
る。Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the present invention. That is, in the present embodiment, the defrosting time is shortened by controlling the operating frequency of the compressor 2 and the opening degree of the electric expansion valve 4, but in addition, the control for avoiding unmelted frost remains. In other words, it is also possible to implement control such as setting the defrost time slightly longer than usual or setting the defrost operation end heat exchanger temperature higher than usual. . Further, in the above embodiment, the case where the reverse cycle defrosting operation is performed has been described as an example. However, a defrosting operation by another method, for example, a bypass passage leading from the compressor 2 to the outdoor heat exchanger 3 is provided,
The above control can be applied to a defrosting operation or the like by supplying hot gas through the bypass passage.
【0027】[0027]
【発明の効果】以上のように請求項1の空気調和機によ
れば、外気温度が低い場合に、圧縮機の運転周波数を上
げて除霜性能を高めるよう制御したことによって、その
時の外気温度に応じた除霜運転を行うことが可能になる
と共に、除霜時間の短縮化を図ることができる。As described above, according to the air conditioner of the first aspect, when the outside air temperature is low, the operating frequency of the compressor is controlled to increase the defrosting performance. In addition to performing the defrosting operation according to the above, the defrosting time can be shortened.
【0028】また請求項2の空気調和機によれば、空気
調和機を設置した場所の環境条件に応じて、除霜運転時
の運転周波数を手動で選択することが可能となるため、
除霜時間の短縮化を図ることができる。According to the air conditioner of the second aspect, the operating frequency during the defrosting operation can be manually selected according to the environmental conditions of the place where the air conditioner is installed.
The defrosting time can be reduced.
【0029】さらに請求項3の空気調和機によれば、設
置場所の環境条件に応じて圧縮機の運転周波数を手動設
定することが可能であると共に、その時の外気温度に応
じても運転周波数が可変可能に構成されているため、よ
り適切な運転周波数で除霜運転を行うことができると共
に、除霜時間の短縮化を図ることもできる。Further, according to the air conditioner of the third aspect, it is possible to manually set the operating frequency of the compressor in accordance with the environmental conditions of the installation place, and to set the operating frequency in accordance with the outside air temperature at that time. Since it is configured to be variable, the defrosting operation can be performed at a more appropriate operation frequency, and the defrosting time can be shortened.
【0030】請求項4の空気調和機によれば、運転周波
数の増加と共に減圧機構の開度も増加させることによっ
て、循環量を増やすことができるため、上記除霜性能を
より高めることができ、さらなる除霜時間の短縮化を図
ることができる。According to the air conditioner of the fourth aspect, the amount of circulation can be increased by increasing the opening of the pressure reducing mechanism as the operating frequency increases, so that the defrosting performance can be further improved. It is possible to further shorten the defrosting time.
【図1】本発明の第1実施形態である空気調和機の構成
を示す冷媒回路図である。FIG. 1 is a refrigerant circuit diagram illustrating a configuration of an air conditioner according to a first embodiment of the present invention.
【図2】上記第1実施形態である空気調和機における圧
縮機の運転周波数制御を説明するための説明図である。FIG. 2 is an explanatory diagram for explaining operating frequency control of a compressor in the air conditioner according to the first embodiment.
【図3】上記第1実施形態である空気調和機における圧
縮機の運転周波数の切換制御を行うための制御フローチ
ャートである。FIG. 3 is a control flowchart for controlling switching of an operating frequency of a compressor in the air conditioner according to the first embodiment.
1 空気調和機 2 圧縮機 3 室外熱交換器 4 電動膨張弁(減圧機構) 5 室内熱交換器 6 四路切換弁 10 室外熱交温度サーミスタ doa 外気温度 DOALO 基準温度 DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Compressor 3 Outdoor heat exchanger 4 Electric expansion valve (pressure reduction mechanism) 5 Indoor heat exchanger 6 Four-way switching valve 10 Outdoor heat exchange temperature thermistor doa Outside air temperature DOALO Reference temperature
Claims (4)
圧機構(4)とを有し、暖房運転時に蒸発器として機能
する室外熱交換器(3)への着霜を除霜可能に構成した
空気調和機において、外気温度(doa)が基準温度
(DOALO)未満であれば、圧縮機(2)の運転周波
数を基準運転周波数よりも高い運転周波数で除霜運転す
ることを特徴とする空気調和機。1. A frost on an outdoor heat exchanger (3) having a compressor (2), an outdoor heat exchanger (3), and a pressure reducing mechanism (4) and functioning as an evaporator during a heating operation is removed. If the outside air temperature (doa) is lower than the reference temperature (DOALO) in the air conditioner configured to allow frost, the operation frequency of the compressor (2) may be defrosted at an operation frequency higher than the reference operation frequency. A characteristic air conditioner.
圧機構(4)とを有し、暖房運転時に蒸発器として機能
する室外熱交換器(3)への着霜を除霜可能に構成した
空気調和機において、除霜運転時における圧縮機(2)
の運転周波数を第1基準運転周波数で行うか、あるいは
第1基準運転周波数よりも高く設定される第2基準運転
周波数で行うかを手動設定可能に構成したことを特徴と
する空気調和機。2. A frost on an outdoor heat exchanger (3) having a compressor (2), an outdoor heat exchanger (3), and a pressure reducing mechanism (4) and functioning as an evaporator during a heating operation is removed. Compressor (2) for defrosting operation in an air conditioner configured to allow frost
An air conditioner characterized in that it is configured to be able to manually set whether to perform the operation frequency at a first reference operation frequency or at a second reference operation frequency set higher than the first reference operation frequency.
圧機構(4)とを有し、暖房運転時に蒸発器として機能
する室外熱交換器(3)への着霜を除霜可能に構成した
空気調和機において、除霜運転時における圧縮機(2)
の運転周波数を第1基準運転周波数で行うか、あるいは
第1基準運転周波数よりも高く設定される第2基準運転
周波数で行うかを手動設定可能に構成すると共に、外気
温度(doa)が基準温度(DOALO)未満であれ
ば、圧縮機(2)の運転周波数を上記各基準運転周波数
よりもさらに高い運転周波数で除霜運転することを特徴
とする空気調和機。3. A frost on an outdoor heat exchanger (3) having a compressor (2), an outdoor heat exchanger (3), and a pressure reducing mechanism (4) and functioning as an evaporator during a heating operation is removed. Compressor (2) for defrosting operation in an air conditioner configured to allow frost
It is possible to manually set whether the operation frequency is performed at the first reference operation frequency or at the second reference operation frequency set higher than the first reference operation frequency, and the outside air temperature (doa) is set to the reference temperature. An air conditioner characterized by performing a defrosting operation at an operating frequency higher than each of the reference operating frequencies when the operating frequency of the compressor (2) is lower than (DOALO).
せたときに、上記減圧機構(4)の開度を増加させるこ
とを特徴とする請求項1〜請求項3のいずれかの空気調
和機。4. The air according to claim 1, wherein when the operating frequency of the compressor (2) is increased, the opening of the pressure reducing mechanism (4) is increased. Harmony machine.
Priority Applications (1)
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JP2000273420A JP2002081714A (en) | 2000-09-08 | 2000-09-08 | Air conditioner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000273420A JP2002081714A (en) | 2000-09-08 | 2000-09-08 | Air conditioner |
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Publication Number | Publication Date |
---|---|
JP2002081714A true JP2002081714A (en) | 2002-03-22 |
Family
ID=18759362
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WO2009047898A1 (en) * | 2007-10-09 | 2009-04-16 | Panasonic Corporation | Refrigeration cycle device |
US20110289945A1 (en) * | 2009-02-11 | 2011-12-01 | Bong-Jun Choi | Control method of a refrigerator |
CN105202689A (en) * | 2014-06-27 | 2015-12-30 | 青岛海尔空调器有限总公司 | Method and system for improving target frequency control precision of compressor after defrosting of air conditioner |
CN108019972A (en) * | 2017-12-04 | 2018-05-11 | 珠海格力电器股份有限公司 | Air source heat pump unit and defrosting control method and device thereof |
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2000
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006118726A (en) * | 2004-10-19 | 2006-05-11 | Denso Corp | Ejector cycle |
WO2009047898A1 (en) * | 2007-10-09 | 2009-04-16 | Panasonic Corporation | Refrigeration cycle device |
US20100218528A1 (en) * | 2007-10-09 | 2010-09-02 | Panasonic Corporation | Refrigeration cycle apparatus |
JP5121844B2 (en) * | 2007-10-09 | 2013-01-16 | パナソニック株式会社 | Refrigeration cycle equipment |
US8590326B2 (en) | 2007-10-09 | 2013-11-26 | Panasonic Corporation | Refrigeration cycle apparatus |
US20110289945A1 (en) * | 2009-02-11 | 2011-12-01 | Bong-Jun Choi | Control method of a refrigerator |
KR101573538B1 (en) * | 2009-02-11 | 2015-12-02 | 엘지전자 주식회사 | Control method of refrigerator |
CN105202689A (en) * | 2014-06-27 | 2015-12-30 | 青岛海尔空调器有限总公司 | Method and system for improving target frequency control precision of compressor after defrosting of air conditioner |
CN108019972A (en) * | 2017-12-04 | 2018-05-11 | 珠海格力电器股份有限公司 | Air source heat pump unit and defrosting control method and device thereof |
CN109869877A (en) * | 2019-03-12 | 2019-06-11 | 奥克斯空调股份有限公司 | A kind of control method, control device and the air conditioner of air-conditioning heating mode |
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