JPS59225263A - Heat pump type air conditioner - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 （イ）　産業上の利用分野 本発明は能力可変圧縮機を用いたヒートポンプ式空気調
和機に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a heat pump air conditioner using a variable capacity compressor.

（ロ）従来技術 従来、能カ一定の圧縮機を備えたヒートポンプ式空気調
和機に於〜）て、暖房時、室外側熱交換器の着霜を未然
に防止するため、この室外側熱交換器の風上側に加熱器
を設けこの加熱器に流入される冷媒量を外気温の低下に
応じて増加させていた。(b) Prior Art Conventionally, in a heat pump type air conditioner equipped with a compressor of constant capacity, the outdoor heat exchanger was used to prevent frost formation on the outdoor heat exchanger during heating. A heater was installed on the windward side of the vessel, and the amount of refrigerant flowing into the heater was increased as the outside temperature decreased.

しかしながら圧縮機の能力が一定であるため、加熱器に
流入される高温冷媒の流量が増加すれば、その分室内熱
交換器に流入される冷媒量が減少し暖房能力が低下する
欠点があった。However, since the capacity of the compressor is constant, if the flow rate of high-temperature refrigerant flowing into the heater increases, the amount of refrigerant flowing into the indoor heat exchanger will decrease accordingly, resulting in a decrease in heating capacity. .

（ハ）発明の目的 暖房時の能力の低下を防止することを目的としたもので
ある。(c) Purpose of the invention The purpose of the invention is to prevent a decrease in performance during heating.

に）　発明の構成 能力可変圧縮機に冷暖切換弁を介して室外側熱交換器お
よび室内側熱交換器を接続し、この室外側熱交換器の外
気流入側にこの室外側熱交換器の加熱器を配設すると共
に、この加熱器へ流入する冷媒量を制御する制御弁を前
記加熱器に接続し、暖房時外気温の低下に応じて能力可
変圧縮機を高能力で運転し、この加熱器に流入する冷媒
量を増加させると共に室内側熱交換器に流入する冷媒量
を略一定に保持させるようにしたものである。(b) An outdoor heat exchanger and an indoor heat exchanger are connected to the variable capacity compressor of the invention via a cooling/heating switching valve, and the heating of the outdoor heat exchanger is connected to the outside air inflow side of the outdoor heat exchanger. At the same time, a control valve for controlling the amount of refrigerant flowing into the heater is connected to the heater, and a variable capacity compressor is operated at high capacity according to the drop in outside temperature during heating, and the heating The amount of refrigerant flowing into the indoor heat exchanger is increased, and the amount of refrigerant flowing into the indoor heat exchanger is kept approximately constant.

（ホ）　実施例 （１）は能力可変圧縮機で、この圧縮機（１）は入力さ
れる電源の周波数（３０ｔ（ｚ〜９０Ｈｚ）に応じて回
転数が制御されるようになっている。（２）は冷暖切換
弁、（３）は暖房時蒸発器として冷房時凝縮器として作
用する室外側熱交換器、（４）は減圧装置、（５）は暖
房時に凝縮器として、冷房時に蒸発器として作用する室
内側熱交換器、（６）は室外側熱交換器（３）の外気流
入側に配設させた加熱器で、冷暖切換弁（２）と室内側
熱交換器（５）との間の冷媒主配管（７）から分岐して
室内側熱交換器（５）と減圧装置（４）との間の冷媒主
配管（８）に入る冷媒補助配管（９）及び（ｉ匂によっ
て冷媒主配管（７）＜８１）と連絡する。卸は冷媒補助
配管（９）０〔の途中に設けた制御弁である。（１２は
外気温検出ｉ、（１３）はマイクロコンピュータ又はそ
の他電子回路よりなる制御装置で、外気温検出器（１２
からの信号を受けて、圧縮機（ＩＪへ供給する電源の周
波数と制御弁（Ｌｌ）への制御信号とを設定するように
なっている。この設定について詳述すれば外気温が低い
程詠い電源の周波数（９０Ｈｚから６０１１ｚまでの間
の任意の電源周波数）を圧縮機（１）へ供給すると共に
制御弁（１１）の開度を大きくさせ、高い周波数が供給
されて高能力で運転されている圧縮機から吐出される冷
媒循環量のうち略一定量（６０■２の圧縮機の通常運転
時に吐出される冷媒量とほぼ同一）を室内熱交換器（５
）へ、高能力運転で増加した冷媒循環量を加熱器（６）
へ夫々流入させるようにしである０ 次に動作を説明する。暖房運転時に冷暖切換弁（２）を
破線状態に設定して６０Ｈｚの通常運転を行なわせ、圧
縮機（１）から吐出された冷媒を破線矢印の如（循環さ
せる。そして室内側熱交換器（５）にて冷媒が凝縮液化
される際に放出される熱により室内を暖房する。この暖
房運転時外気温が低下して室外側熱交換器（３）に媚が
付着しそうになった場合（例えば外気温が０℃付近）は
、外気温検出器Ｑ２が作動する。この検出器α２からの
信号を制御装置０３１が受けて、圧縮ｍ（１１へ供給す
る電源の周波数を外気温の低下に応じて６０１（ｚ〜９
（Ｈｌｚの間の任意の電源の周波数に設定すると共に、
上述の圧縮機の運転状態に応じた制御弁ａυの開度な設
定する。(E) Embodiment (1) is a variable capacity compressor, and the rotation speed of this compressor (1) is controlled according to the frequency (30t (z~90Hz)) of the input power supply. (2) is a cooling/heating switching valve, (3) is an outdoor heat exchanger that functions as an evaporator during heating and a condenser during cooling, (4) is a pressure reducing device, and (5) functions as a condenser during heating and evaporates during cooling. The indoor heat exchanger (6) is a heater installed on the outside air inflow side of the outdoor heat exchanger (3), and the heating/cooling switching valve (2) and the indoor heat exchanger (5) A refrigerant auxiliary pipe (9) and (i) which branch from the refrigerant main pipe (7) between the It communicates with the refrigerant main pipe (7) < 81).The outlet is a control valve installed in the middle of the refrigerant auxiliary pipe (9) 0. (12 is the outside temperature detection i, (13) is a microcomputer or other A control device consisting of an electronic circuit that detects an outside temperature sensor (12
The frequency of the power supply to the compressor (IJ) and the control signal to the control valve (Ll) are set by receiving a signal from the compressor (IJ). The power frequency (any power frequency between 90Hz and 6011z) is supplied to the compressor (1), and the opening degree of the control valve (11) is increased, so that a high frequency is supplied and the compressor is operated at high capacity. Of the circulating amount of refrigerant discharged from the compressor in
), the increased refrigerant circulation amount due to high capacity operation is transferred to the heater (6).
Next, the operation will be explained. During heating operation, the cooling/heating switching valve (2) is set to the broken line state to perform normal operation at 60 Hz, and the refrigerant discharged from the compressor (1) is circulated as shown by the broken line arrow.Then, the indoor heat exchanger ( In step 5), the room is heated by the heat released when the refrigerant is condensed and liquefied.If the outside temperature drops during this heating operation and the outdoor heat exchanger (3) is about to become heated ( For example, when the outside temperature is around 0°C, the outside temperature detector Q2 is activated.The control device 031 receives a signal from this detector α2, and changes the frequency of the power supply to the compression m (11) so that the outside temperature decreases. 601 (z ~ 9
(Set to any power supply frequency between Hlz,
The opening degree of the control valve aυ is set according to the operating state of the compressor described above.

すなわち略一定量の冷媒を室内側熱交換器（５）へ流す
と共に外気温の低下に応じて圧ｍ４ｍ＜１１に供給され
る電源の周波数を高く設定し、圧縮機を高能力で運転さ
せ、この高能力の運転で増大した冷媒量を加熱器（６）
へ流すようになっている。そして外気を加熱器（６）で
暖めて送風機（図示せず）で室外側熱交換器（３）へ送
風させ、この室外側熱交換器に霜が付着しないようにし
ている。That is, a substantially constant amount of refrigerant is allowed to flow into the indoor heat exchanger (5), and the frequency of the power supply supplied to the pressure m4m<11 is set high as the outside temperature decreases, and the compressor is operated at high capacity. The increased amount of refrigerant due to this high-capacity operation is transferred to the heater (6).
It is designed to flow to The outside air is then warmed by a heater (6) and blown to the outdoor heat exchanger (3) by a blower (not shown) to prevent frost from adhering to the outdoor heat exchanger.

冷房運転時は、冷暖切換弁（２）を実線状態に設定して
圧縮機（１）から吐出された冷媒を実線矢印の如く循環
させる。そして室内側熱交換器（５）にて冷媒が蒸発気
化される際に吸収される熱により室内を冷房する。上記
冷房並びに暖房運転時、空調負荷の減少に応じて圧縮機
（１）へ供給される電源の周波数（６０Ｈｚから３０Ｈ
ｚ）を低く設定して能力を低下させるようになっている
。During cooling operation, the cooling/heating switching valve (2) is set to the solid line state, and the refrigerant discharged from the compressor (1) is circulated as shown by the solid line arrow. Then, the room is cooled by the heat absorbed when the refrigerant is evaporated in the indoor heat exchanger (5). During the above-mentioned cooling and heating operations, the frequency (from 60Hz to 30Hz) of the power supplied to the compressor (1) is
z) is set low to reduce the ability.

尚、上記実施例では加熱器（６）が室内側熱交換器（５
）と並列に配設されており、且つ制御弁Ｕがこの加熱器
（６）の流出側の冷媒補助配管ａ０に接続されているた
め、暖房運転時この制御弁Ｑｌ）が閉じられた状態では
冷媒回路中の余剰冷媒が加熱器（１１１に貯溜される。In the above embodiment, the heater (6) is connected to the indoor heat exchanger (5).
) and the control valve U is connected to the refrigerant auxiliary pipe a0 on the outflow side of this heater (6), so when this control valve Ql) is closed during heating operation, Excess refrigerant in the refrigerant circuit is stored in the heater (111).

（へ）発明の効果 暖房時、外気温の低下に応じて能力可変の圧縮機を高能
力で運転し、冷媒吐出量の増大分を加熱器へ流すことに
より室内側熱交換器に流入する冷媒量を低下させること
なく加熱器での冷媒の発熱量を増大する。(f) Effects of the invention During heating, the refrigerant flows into the indoor heat exchanger by operating the variable-capacity compressor at high capacity according to the drop in outside temperature and flowing the increased refrigerant discharge amount to the heater. To increase the calorific value of the refrigerant in the heater without reducing the amount.

これにより、室外側熱交換器の外気流入側に位置する加
熱器の発熱量が増し室外側熱交換器に霜が付着するのを
防ぐと共に略一定量の冷媒を室内側熱交換器へ流すこと
ができ暖房運転時の能力の低下を防止することができる
。This increases the calorific value of the heater located on the outside air inflow side of the outdoor heat exchanger, prevents frost from adhering to the outdoor heat exchanger, and allows a substantially constant amount of refrigerant to flow into the indoor heat exchanger. This can prevent a decline in performance during heating operation.

【図面の簡単な説明】[Brief explanation of drawings]

図面は本発明の一実施例を示す冷媒回路図である０ （１）・・・能力可変圧縮機、（２）・−・冷暖切換弁
、（３）・・・室外側熱交換器、（５）・・・室内側熱
交換器、（６）・−加熱器、　ＯＩｌ・・・制御弁。The drawing is a refrigerant circuit diagram showing an embodiment of the present invention. 5) Indoor heat exchanger, (6) Heater, OIl Control valve.

Claims (1)

【特許請求の範囲】[Claims] （１）能力可変圧縮機に冷暖切換弁を介し゛て室外側熱
交換器および室内側熱交換器を接続し、この室外側熱交
換器の外気流入側にこの室外側熱交換器の加熱器を配設
すると共に、この加熱器へ流入する冷媒量を制御する制
御弁を前記加熱器に接続し、暖房時外気温の低下に応じ
て能力可変圧縮機を高能力で運転しこの加熱器に流入す
る冷媒量を増加させると共に室内側熱交換器に流入する
冷媒量を略一定に保持させることを特徴とするヒートポ
ンプ式空気調和機。(1) Connect the outdoor heat exchanger and the indoor heat exchanger to the variable capacity compressor via the cooling/heating switching valve, and connect the outdoor heat exchanger's heater to the outside air inflow side of the outdoor heat exchanger. At the same time, a control valve for controlling the amount of refrigerant flowing into this heater is connected to the heater, and a variable capacity compressor is operated at high capacity in response to a drop in outside temperature during heating, and A heat pump air conditioner characterized by increasing the amount of refrigerant flowing into the indoor heat exchanger and keeping the amount of refrigerant flowing into the indoor heat exchanger substantially constant.