JPH01203848A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH01203848A JPH01203848A JP2757488A JP2757488A JPH01203848A JP H01203848 A JPH01203848 A JP H01203848A JP 2757488 A JP2757488 A JP 2757488A JP 2757488 A JP2757488 A JP 2757488A JP H01203848 A JPH01203848 A JP H01203848A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- compressors
- compressor
- pipe
- air conditioner
- 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
- 238000005057 refrigeration Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 12
- 239000003507 refrigerant Substances 0.000 description 11
- 238000004378 air conditioning Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007791 dehumidification Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21155—Temperatures of a compressor or the drive means therefor of the oil
Landscapes
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
この発明は室内の冷暖房等の空気調和を行なうヒートポ
ンプ式空気調和機に係り、特に冷凍サイクルに組み込ま
れる複数台のコンプレッサの油面レベルを調節制御でき
るようにした空気調和様に関する。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a heat pump type air conditioner that performs air conditioning such as indoor heating and cooling, and particularly relates to a heat pump type air conditioner that performs air conditioning such as indoor heating and cooling, and in particular, a heat pump type air conditioner that performs air conditioning such as indoor heating and cooling. This relates to an air conditioner that allows the oil level to be adjusted and controlled.
（従来の技術）
室内の冷房や暖房、除湿等の空気調和を行なうヒートポ
ンプ式空気調和機は、コンプレッサ、室外側熱交換器、
膨張機構および室内側熱交換器等を順次接続した冷凍サ
イクルを備えている。この冷凍サイクルの中には室外ユ
ニット内に２台のコンプレッサを並列接続状態に組み込
んだものがある。すなわち、１つの冷凍サイクル内に２
台のコンプレッサを備えたヒートポンプ式空気調和機が
存在する。(Conventional technology) A heat pump air conditioner that performs indoor air conditioning such as cooling, heating, and dehumidification uses a compressor, an outdoor heat exchanger,
It is equipped with a refrigeration cycle in which an expansion mechanism, an indoor heat exchanger, etc. are sequentially connected. Some of these refrigeration cycles include two compressors connected in parallel in an outdoor unit. That is, 2 in one refrigeration cycle.
There are heat pump air conditioners equipped with several compressors.
この空気調和機は室外ユニットに収容される２台のコン
プレッサ間同士を連通管としての均油管で接続し、均油
運転時に上記均油管を通してオイルを流通させ、各コン
プレッサ内の油面レベルを調節制御している。This air conditioner connects two compressors housed in an outdoor unit with an oil equalizing pipe as a communication pipe, and during oil equalizing operation, oil flows through the oil equalizing pipe to adjust the oil level in each compressor. It's in control.
均油運転は２台のコンプレッサの運転周波数を所定時間
ごとに交互に上昇、下降させることにより行なわれ、空
気調和機の冷房運転や暖房運転等の空気調和運転中に並
行して行なわれる。The oil equalization operation is performed by alternately increasing and decreasing the operating frequencies of the two compressors at predetermined intervals, and is performed in parallel during air conditioning operations such as cooling and heating operations of the air conditioner.
（発明が解決しようとする課題）
この種のヒートポンプ式空気調和機では、冷凍サイクル
の各種負荷条件を考慮して、２台のコンプレッサの運転
周波数を交互に上昇、下降させる均油運転の時間を最大
公約数的に設定しているが、この設定方法では各コンプ
レッサ内の油面レベル制御が必ずしも最適ではなかった
。しかも、２台のコンプレッサの運転周波数を変化させ
る均油運転を所定時間づつ行なうので、コンプレッサの
運転周波数変化が生じる度合が多く、冷凍サイクルの能
力変動が多い等の問題があった。(Problem to be Solved by the Invention) In this type of heat pump type air conditioner, the operating frequency of the two compressors is alternately raised and lowered by taking into consideration various load conditions of the refrigeration cycle. Although this setting method is based on the greatest common divisor, oil level control within each compressor is not necessarily optimal. In addition, since the oil equalization operation is performed in which the operating frequencies of the two compressors are changed for a predetermined period of time, there are problems in that the operating frequencies of the compressors often change and the capacity of the refrigeration cycle often fluctuates.
この発明は、上述した事情を考慮してなされたもので、
必要時のみの均油操作により、各コンプレッサ内を最適
油面レベルに調節制御した空気調和機を提供することを
目的とする。This invention was made in consideration of the above-mentioned circumstances,
The purpose of the present invention is to provide an air conditioner that adjusts and controls the oil level in each compressor to an optimum oil level by performing oil equalization operations only when necessary.
（課題を解決するための手段）
この発明に係る空気調和機は、上述した目的を達成する
ために、冷凍サイクル内に複数台のコンプレッサを並列
接続状態で組み込み、上記コンプレッサを室外ユニット
に収容した空気調和機において、前記各コンプレッサの
下部同士を接続した連通管に油温検出サーモを設け、前
記各コンプレッサ内の油面レベルを調節する均油操作時
に、油温検出ナーモで一定以上の油温変化を検出したと
き、均油運転を継続させる油面制御装置を備えたもので
ある。(Means for Solving the Problems) In order to achieve the above-mentioned object, an air conditioner according to the present invention incorporates a plurality of compressors connected in parallel in a refrigeration cycle, and houses the compressors in an outdoor unit. In an air conditioner, an oil temperature detection thermometer is installed in the communication pipe connecting the lower parts of each compressor, and during oil equalization operation to adjust the oil level in each compressor, the oil temperature detection thermometer detects the oil temperature above a certain level. It is equipped with an oil level control device that continues oil leveling operation when a change is detected.
（作用）
この空気調和機は、冷凍サイクル内に複数台のコンプレ
ッサを並列接続状態で組み込み、各コンプレッサの底部
同士を接続する連通管に温度検出サーモを設け、均油運
転時に、油温検出！ナーモが一定以上の油温変化を検出
したとき、油面制御装置により均油運転を継続させるよ
うにして各コンプレッサ内を最適油面レベルに調ｗ制御
している。これにより、均油運転を必要時にのみ行なっ
てコンプレッサの運転周波数変化度合を少なくし、冷凍
サイクルの能力変動を極力制御して安定的な運転を行な
い得るようにしたものである。(Function) This air conditioner incorporates multiple compressors connected in parallel in the refrigeration cycle, and a temperature detection thermometer is installed in the communication pipe connecting the bottoms of each compressor to detect the oil temperature during oil equalization operation! When NAMO detects a change in oil temperature above a certain level, the oil level control device continues oil equalization operation to maintain the optimum oil level in each compressor. As a result, oil equalization operation is performed only when necessary, reducing the degree of change in the operating frequency of the compressor, and controlling fluctuations in the capacity of the refrigeration cycle as much as possible to ensure stable operation.
（実施例）
以下、この発明に係る空気調和機の一実施例について添
付図面を参照して説明する。(Example) Hereinafter, an example of an air conditioner according to the present invention will be described with reference to the accompanying drawings.
第１図は室内の冷房、暖房あるいは除湿等の空気調和を
行なうヒー］・ポンプ式空気調和機の一例を示すもので
、この空気調和機は、室外ユニット１０および室内ユニ
ット１１内に冷媒を循環させる冷凍サイクル１２を備え
ている。冷凍サイクル１２はコンプレッサ１３、四方弁
１４、室外側熱交換器１５、ｆｌＦＡＩ！！ＩＩ構１６
、リキッドタンク１７、室内側熱交換器１８を順次接続
し、四方弁１４からアキュムレータ１９を経てコンプレ
ッサ１３に戻る冷媒循環回路を構成している。膨Ｍ機構
１６は例えば暖房用温度式膨脹弁膨張ａおよび冷房用温
度式膨服弁１６ｂを組み合せたものである。Figure 1 shows an example of a heat pump type air conditioner that performs air conditioning such as indoor cooling, heating, or dehumidification. A refrigeration cycle 12 is provided. The refrigeration cycle 12 includes a compressor 13, a four-way valve 14, an outdoor heat exchanger 15, and flFAI! ! II structure 16
, a liquid tank 17, and an indoor heat exchanger 18 are sequentially connected to form a refrigerant circulation circuit that returns from the four-way valve 14 to the compressor 13 via the accumulator 19. The expansion M mechanism 16 is, for example, a combination of a temperature-type expansion valve a for heating and a temperature-type expansion valve 16b for cooling.
上記冷凍サイクル１２に組み込まれるコンプレッサ１３
は２台１３ａ、１３ｂが互いに並列接続されており、各
コンプレッサ１３ａ、１３ｂの吐出側はオイルセパレー
タ２０ａ、２０ｂを経て冷媒吐出管２１に合流せしめら
れる。吐出冷媒は冷房運転時には四方弁１４を経て室外
側熱交換器１５に、暖房運転時には室内側熱交換器１８
に案内されるようになっ′Ｃいる。Compressor 13 incorporated in the refrigeration cycle 12
Two compressors 13a and 13b are connected in parallel to each other, and the discharge side of each compressor 13a and 13b is joined to a refrigerant discharge pipe 21 via oil separators 20a and 20b. The discharged refrigerant passes through the four-way valve 14 to the outdoor heat exchanger 15 during cooling operation, and to the indoor heat exchanger 18 during heating operation.
I started to be guided by 'C.
一方、オイルセパレータ２０ａ、２０ｂは各コンプレッ
サ１３ａ、１３ｂの吐出分岐管２１ａ。On the other hand, the oil separators 20a and 20b are discharge branch pipes 21a of each compressor 13a and 13b.
２１ｂに設けられ、上記オイルセパレータ２０ａ。21b, and the oil separator 20a.
２０ｂで回収されたオイルは各オイル戻し管２２ａ、２
２ｂを通ってコンプレッサ１３の吸込側に案内され、各
冷媒吸込配管２３ａ、２３ｂからコンプレッサ１３内に
戻される。オイルセパレータ２０ａ、２０ｂにて回収で
きなかったオイルは冷凍サイクル１２内を一巡して冷媒
吸込管２３から各冷媒吸込配管２３ａ、２３ｂに分流さ
れて各コンプレッサに戻される。The oil recovered at 20b is transferred to each oil return pipe 22a, 2
2b to the suction side of the compressor 13, and is returned into the compressor 13 from each refrigerant suction pipe 23a, 23b. The oil that cannot be recovered by the oil separators 20a, 20b goes around the refrigeration cycle 12, is branched from the refrigerant suction pipe 23 to each refrigerant suction pipe 23a, 23b, and is returned to each compressor.
また、各コンプレッサ１３ａ、１３ｂはインバータ装置
２５ａ、２５ｂにより運転周波数制御されて駆動され、
能ノＪ可変構造に構成される。インバータ装置ｆｆ２５
ａ、２５ｂは室外マイコン等のコントローラ２６からの
出力信号により運転制御される。Further, each compressor 13a, 13b is driven by operating frequency controlled by inverter devices 25a, 25b,
Constructed with NonoJ variable structure. Inverter device ff25
The operation of a and 25b is controlled by an output signal from a controller 26 such as an outdoor microcomputer.
他方、室外ユニット１０内に収容される２台のコンプレ
ッサ１３ａ、１３ｂはその下部同士が例えば基準油面の
高さ部分で連通管としての均油管２８により接続される
。この均油管２８で接続することにより両コンプレッサ
１３ａ、１３ｂ間でオイルの流通を可能にする一方、均
油管２８の表面には油温検出サーモ２９が設けられ、こ
の油温検出１Ｙ−モ２９にて均油管２８内のオイル温度
が検出され、この検出信号が油面制御装置３０を構成す
るコントローラ２６に送られる。油面制御装置３０は例
えばコントローラ２６およびインバータ装置２５ａ、２
５ｂから構成されるが、このコントローラ２６から独立
して構成してもよい。コントローラ２６は油温検出サー
モ２９からの検出信号を優先的に処理し、油温検出サー
モ２９からの信号により各コンプレッサ１３ａ、１３ｂ
の運転周波数を制御している。On the other hand, the lower portions of the two compressors 13a and 13b housed in the outdoor unit 10 are connected to each other by an oil equalizing pipe 28 serving as a communicating pipe, for example, at the height of the reference oil level. By connecting with this oil equalizing pipe 28, oil can flow between both compressors 13a and 13b. On the other hand, an oil temperature detection thermostat 29 is provided on the surface of the oil equalizing pipe 28. The oil temperature in the oil equalizing pipe 28 is detected, and this detection signal is sent to the controller 26 that constitutes the oil level control device 30. The oil level control device 30 includes, for example, a controller 26 and inverter devices 25a and 2.
5b, but may be configured independently from this controller 26. The controller 26 processes the detection signal from the oil temperature detection thermometer 29 with priority, and controls each compressor 13a, 13b based on the signal from the oil temperature detection thermometer 29.
The operating frequency is controlled.
２台のコンプレッサ１３ａ、１３ｂを収容した室外ユニ
ツ１−１０は第３図に示１ように構成され、ユニットケ
ーシング１０ａ内は仕切板３１および送風機ベース３２
により上下に仕切られ、ユニットケーシング３０内に上
部、中間および下部のチャンバ３３．３４．３５が形成
される。このうち、下部チャンバ３３には２台のコンプ
レッサ１３ａ。The outdoor unit 1-10 housing two compressors 13a and 13b is constructed as shown in FIG.
upper and lower chambers 33, 34, and 35 are formed within the unit casing 30. Among these, the lower chamber 33 has two compressors 13a.
１３ｂの他にリキッドタンク１７やアキュムレータ１９
が収容されるとともに、コンプレッサ１３ａ、１３ｂの
周波数制御運転を行なうインバータ装置２５ａ、２５ｂ
および油面制御装置を兼ねる室外マイコン等のコントロ
ーラ２６が収容される。In addition to 13b, there is a liquid tank 17 and an accumulator 19.
Inverter devices 25a and 25b accommodate frequency control of the compressors 13a and 13b.
A controller 26 such as an outdoor microcomputer that also serves as an oil level control device is housed.
コントローラ２６は室内ユニット１１側の図示しないマ
ルチコン１〜ローラや油温検出サーモからの出力信号を
入力して、ｌ記インバータ装置２５ａ。The controller 26 inputs output signals from the multicontroller 1 to the roller (not shown) and the oil temperature detection thermometer on the indoor unit 11 side, and operates the inverter device 25a.
２５ｂやコンプレッサ１３ａ、１３ｂ、四方弁１４およ
び室外送風機３６の駆動を制御している。25b, compressors 13a and 13b, four-way valve 14, and outdoor blower 36.
室外送風機３６はユニットケーシング１０ａ内の送風機
ベース３２上に複数台、例えば４台設置され、これらの
室外送風１３６は各コンプレツナ１３ａ、１３ｂの運転
状態に応じて室外送風量が制御されるようになっている
。A plurality of outdoor air blowers 36, for example four, are installed on the air blower base 32 in the unit casing 10a, and the amount of outdoor air blown by these outdoor air blowers 136 is controlled according to the operating state of each compressor 13a, 13b. ing.
次に、空気講和機の作用を説明する。Next, the operation of the air peace machine will be explained.
この空気調和機にて冷房運転を行なう場合、コンプレッ
サはインバータ装置２５ａ、２５ｂにより運転周波数制
御されて駆動される。コンプレッサの駆動により吐出さ
れた冷媒は実線矢印ａで示すように案内され、室内側熱
交換器１８で室内空気を冷部し、室内を冷房する。When this air conditioner performs cooling operation, the compressor is driven under operating frequency control by inverter devices 25a and 25b. The refrigerant discharged by the drive of the compressor is guided as shown by the solid arrow a, and the indoor heat exchanger 18 cools the indoor air to cool the room.
また、暖房運転時には、四方弁１４を暖房運転側に切り
換える。そして、コンプレッサ１３ａ。Further, during heating operation, the four-way valve 14 is switched to the heating operation side. And a compressor 13a.
１３ｂから吐出された冷媒を破線矢印すで示すように流
して室内側熱交換器１８で室内空気を暖め、室内を暖房
する。The refrigerant discharged from the refrigerant 13b flows as indicated by the broken line arrow to warm the indoor air in the indoor heat exchanger 18, thereby heating the room.
ところで、このヒートポンプ式空気調和機のように、１
つの冷凍サイクル１２内に２台のコンプレッサ１３ａ、
１３ｂを並列接続状態にて組み込む場合、運転状態如何
によって各コンプレッサ１３ａ、１３ｂ内の油面レベル
にアンバランスが生じることがあり、このため、］ンブ
レツサ１３ａ。By the way, like this heat pump type air conditioner, 1
Two compressors 13a in one refrigeration cycle 12,
When the compressors 13b are connected in parallel, the oil level in each compressor 13a, 13b may become unbalanced depending on the operating state.
１３ｂ同士は均油管２８で連通され、油面レベルのアン
バランスを解消させている。13b are communicated with each other through an oil equalizing pipe 28 to eliminate imbalance in the oil level.
各コンプレッサ１３ａ、１３ｂの油面レベルのアンバラ
ンス時に、油面レベルを甲急にバランスさじるべく均油
運転が行なわれる。この均油運転は第４図に示されるフ
ローチャートにより行なわれる。When the oil level of each compressor 13a, 13b is unbalanced, an oil equalization operation is performed to quickly balance the oil level. This oil equalization operation is performed according to the flowchart shown in FIG.
均油運転は、空気講和機の冷房運転あるいは暖房運転開
始後、一方のコンプレッサ例えば１３ａの運転周波数を
上界させ、他方のコンプレッサ１３ｂの運転周波数を下
降させることにより行なわれ、この均油操作開始後一定
時間、例えば約２０秒経過後に均油管２８の表面に取付
けられた油温検出サーモ２９で均油管部のオイル温度変
化を測定する。The oil equalization operation is performed by raising the operating frequency of one compressor, for example, 13a, and lowering the operating frequency of the other compressor 13b, after starting the cooling or heating operation of the air peace machine. After a certain period of time, for example about 20 seconds, an oil temperature detection thermometer 29 attached to the surface of the oil equalizing pipe 28 measures the change in oil temperature in the oil equalizing pipe.
オイル温度変化が許容される設定温度から外れる場合、
均油管２８内でオイルの移動が生じたもの、すなわち変
化ありと判断し、油面１１１１１ｇ装置（コントローラ
）２６により、その状態で均油運転を継続させる。均油
運転が所定時間経過したら通常運転に戻り、次のステッ
プに移る。If the oil temperature change deviates from the allowable set temperature,
It is determined that the oil has moved within the oil equalizing pipe 28, that is, there is a change, and the oil level 11111g device (controller) 26 continues the oil equalizing operation in that state. After the oil equalization operation has elapsed for a predetermined period of time, it returns to normal operation and moves on to the next step.
また、油温検出サーモ２９にて検出されるオイル温度変
化が許容される設定温度以内の場合には、変化なしと判
断し、直ちに次のステップに移行する。Further, if the oil temperature change detected by the oil temperature detection thermometer 29 is within the allowable set temperature, it is determined that there is no change, and the process immediately proceeds to the next step.
次段のステップでは、各コンプレッサ１３ａ。In the next step, each compressor 13a.
１３ｂの運転周波数を逆にし、一方のコンプレッサ１３
ａの運転周波数を下げ、他方のコンプレッサ１３ｂの運
転周波数を上昇させる。この均油操作開始侵一定時間、
例えば約２０秒経過後に、油温検出サーモ２９によるオ
イル油温変化が設定値以内の場合、変化なしと判断し、
均油操作が終了し、空気調和機は通常の冷房運転あるい
はＩＩ！房運転に戻る。The operating frequency of compressor 13b is reversed, and one compressor 13
The operating frequency of the compressor 13a is lowered, and the operating frequency of the other compressor 13b is increased. This oil equalization operation start invasion time,
For example, after approximately 20 seconds have elapsed, if the oil temperature change detected by the oil temperature detection thermometer 29 is within the set value, it is determined that there is no change;
After the oil equalization operation is completed, the air conditioner can return to normal cooling operation or II! Return to driving.
油温検出サーモ２９による判定が変化ありと判断した場
合には、油面ｔｉ１１１Ｘｌ装置３０により前述した均
油運転が継続される。均油運転が所定時間経過したら通
常運転に戻り、均油操作が終了する。If the oil temperature detection thermometer 29 determines that there is a change, the oil level ti111Xl device 30 continues the oil equalization operation described above. After the oil equalization operation has elapsed for a predetermined period of time, normal operation is resumed and the oil equalization operation is completed.
このように、均油操作開始後１．一定時間例えば約２０
秒経過後に油温検出サーモ２９による判定が変化なしと
判断した場合には均油管２８内をオイルの移動が生じな
いものと判断して直ちにコンプレッＩｆ１３ａ、１３ｂ
の運転周波数を逆転させて、逆の均油操作を行ない、同
様の判定を行なう。In this way, after starting the oil equalization operation, 1. For a certain period of time, for example, about 20
If the oil temperature detection thermometer 29 determines that there is no change after seconds have elapsed, it is determined that no oil movement occurs in the oil equalizing pipe 28, and the compressor If13a, 13b is immediately activated.
Reverse the operating frequency, perform the reverse oil equalization operation, and make the same judgment.
２種類の均油操作を終了したら、通常の運転に戻り、冷
房あるいは暖房運転を続ける。そして、所定時間後にこ
の均油操作を繰り返す。After completing the two types of oil equalization operations, return to normal operation and continue cooling or heating operation. This oil equalization operation is then repeated after a predetermined period of time.
以上に述べたＪ：うにこの発明に係る空気調和機におい
ては、冷凍サイクル内に複数台のコンプレッサを並列接
続状態で組み込むととｂに、各コンプレッサの下部同士
を連通する連通管に油渇検出号−モを設け、均油操作時
に、油温検出サーモで一定以上の油温変化を検出したと
き、油面制御装置により均油運転を継続させることによ
り、均油操作タイミングを決定して各コンプレッサ内の
油面レベルを最適状態に保つことができ、均油操作が必
要なときだけ、均油運転を行なうので、各コンプレッサ
の運転周波数変化の度合が少なく、冷凍サイクルの能力
変動が少なく、安定した運転を保証することができる。In the above-mentioned air conditioner according to the present invention, when a plurality of compressors are connected in parallel in the refrigeration cycle, oil starvation is detected in the communication pipe that communicates the lower part of each compressor. When the oil temperature detection thermometer detects a change in oil temperature above a certain level during oil equalization operation, the oil level control device continues the oil equalization operation, determining the oil equalization operation timing and each time. The oil level inside the compressor can be maintained at an optimum level, and oil leveling operation is performed only when it is necessary, so there is little variation in the operating frequency of each compressor, and there is little variation in the capacity of the refrigeration cycle. Stable operation can be guaranteed.
第１図はこの発明に係る空気調和機の一実施例を示す冷
凍サイクル図、第２図は上記空気調和機の室外ユニット
を示す分解斜視図、第３図は上記室外ユニツ１〜内に組
み込まれる２台のコンプレッサの均油管による接続関係
を示す配置図、第４図はこの発明に係る空気調和機で各
コンプレッサ内の油面レベルをＷＪ節する均油操作のフ
ローチャー１・を示す図である。
１０・・・室外ユニット、１１・・・室内ユニット、１
２・・・冷凍サイクル、１３．１３ａ、１３ｂ・・・コ
ンプレッサ、１４・・・四方弁、１５・・・室外側熱交
換器、１６・・・膨圧機構、１７・・・リキッドタンク
、１８・・・室内側熱交換器、１９・・・アキュムレー
タ、２Ｑａ、２０ｂ・・・オイルセパレータ、２１・・
・冷媒吐出管、２３・・・冷媒吸込管、２５ａ、２５ｂ
・・・インバータ装置、２６・・・コントローラ、２８
・・・均油管、２９・・・油温検出サーモ、３０・・・
油面制御装置。
第２図Fig. 1 is a refrigeration cycle diagram showing one embodiment of the air conditioner according to the present invention, Fig. 2 is an exploded perspective view showing the outdoor unit of the air conditioner, and Fig. 3 is a refrigeration cycle diagram showing an example of the outdoor unit of the air conditioner. FIG. 4 is a diagram showing the flowchart 1 of the oil leveling operation for adjusting the oil level in each compressor to WJ in the air conditioner according to the present invention. It is. 10...Outdoor unit, 11...Indoor unit, 1
2... Refrigeration cycle, 13.13a, 13b... Compressor, 14... Four-way valve, 15... Outdoor heat exchanger, 16... Expansion pressure mechanism, 17... Liquid tank, 18 ...Indoor heat exchanger, 19...Accumulator, 2Qa, 20b...Oil separator, 21...
- Refrigerant discharge pipe, 23... Refrigerant suction pipe, 25a, 25b
... Inverter device, 26 ... Controller, 28
... Oil equalizing pipe, 29 ... Oil temperature detection thermometer, 30 ...
Oil level control device. Figure 2
Claims (1)
で組み込み、上記コンプレッサを室外ユニットに収容し
た空気調和機において、前記各コンプレッサの下部同士
を接続した連通管に油温検出サーモを設け、前記各コン
プレッサ内の油面レベルを調節する均油操作時に、油温
検出サーモで一定以上の油温変化を検出したとき、均油
運転を継続させる油面制御装置を備えたことを特徴とす
る空気調和機。In an air conditioner in which a plurality of compressors are connected in parallel in a refrigeration cycle and the compressors are housed in an outdoor unit, an oil temperature detection thermometer is provided in a communication pipe connecting the lower portions of each of the compressors, An air conditioner characterized by being equipped with an oil level control device that continues oil leveling operation when an oil temperature detection thermometer detects a change in oil temperature above a certain level during oil leveling operation to adjust the oil level in the air conditioner. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2757488A JPH01203848A (en) | 1988-02-10 | 1988-02-10 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2757488A JPH01203848A (en) | 1988-02-10 | 1988-02-10 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01203848A true JPH01203848A (en) | 1989-08-16 |
Family
ID=12224766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2757488A Pending JPH01203848A (en) | 1988-02-10 | 1988-02-10 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01203848A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1666813A1 (en) * | 2004-11-17 | 2006-06-07 | LG Electronics Inc. | Multi-type air conditioner and method to distribute oil uniformly |
| JP2009068496A (en) * | 2008-10-27 | 2009-04-02 | Hitachi Industrial Equipment Systems Co Ltd | Compressor unit |
| WO2010021137A1 (en) * | 2008-08-22 | 2010-02-25 | パナソニック株式会社 | Freeze cycling device |
| WO2018079226A1 (en) * | 2016-10-31 | 2018-05-03 | 三菱重工サーマルシステムズ株式会社 | Refrigeration device and refrigeration system |
-
1988
- 1988-02-10 JP JP2757488A patent/JPH01203848A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1666813A1 (en) * | 2004-11-17 | 2006-06-07 | LG Electronics Inc. | Multi-type air conditioner and method to distribute oil uniformly |
| US7721559B2 (en) | 2004-11-17 | 2010-05-25 | Lg Electronics Inc. | Multi-type air conditioner and method for controlling the same |
| WO2010021137A1 (en) * | 2008-08-22 | 2010-02-25 | パナソニック株式会社 | Freeze cycling device |
| CN102124285A (en) * | 2008-08-22 | 2011-07-13 | 松下电器产业株式会社 | Freeze cycling device |
| JPWO2010021137A1 (en) * | 2008-08-22 | 2012-01-26 | パナソニック株式会社 | Refrigeration cycle equipment |
| JP2009068496A (en) * | 2008-10-27 | 2009-04-02 | Hitachi Industrial Equipment Systems Co Ltd | Compressor unit |
| WO2018079226A1 (en) * | 2016-10-31 | 2018-05-03 | 三菱重工サーマルシステムズ株式会社 | Refrigeration device and refrigeration system |
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