JPH0814432B2 - Refrigerator overload control device - Google Patents
Refrigerator overload control deviceInfo
- Publication number
- JPH0814432B2 JPH0814432B2 JP62135563A JP13556387A JPH0814432B2 JP H0814432 B2 JPH0814432 B2 JP H0814432B2 JP 62135563 A JP62135563 A JP 62135563A JP 13556387 A JP13556387 A JP 13556387A JP H0814432 B2 JPH0814432 B2 JP H0814432B2
- Authority
- JP
- Japan
- Prior art keywords
- capacity
- inverter
- compressor
- overcurrent
- value
- 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.)
- Expired - Lifetime
Links
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—Component parts or details not otherwise provided for in this subclass
- 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
- F25B2400/00—Component parts or details not otherwise provided for in this subclass
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
- F25B2400/0751—Details of compressors or related parts with parallel compressors the compressors having different capacities
-
- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、冷凍装置の過負荷制御装置の改良に関し、
特に圧縮機を2台備え、一方をインバータで容量調整
し、他方をアンロード機構で容量調整する場合の過負荷
保護対策に関する。TECHNICAL FIELD The present invention relates to improvement of an overload control device for a refrigeration system,
In particular, the present invention relates to overload protection measures when two compressors are provided, one of which has its capacity adjusted by an inverter and the other of which has an unload mechanism.
(従来の技術) 従来より、この種の冷凍装置の過負荷制御装置とし
て、例えば特開昭59−132779号公報に開示されるよう
に、インバータで容量調整される圧縮機と共に、該圧縮
機のインバータの入力側および出力側での過電流の流通
時を検出する過電流時検出手段を備え、該過電流時検出
手段による過電流検出時には、圧縮機の運転周波数を低
く変更設定して圧縮機の回転数を低下させて、その垂下
制御を行うことにより、インバータでの過電流の流通を
抑止して、インバータを過電流から有効に保護するよう
にしたものが知られている。(Prior Art) Conventionally, as an overload control device for a refrigeration system of this type, as disclosed in, for example, JP-A-59-132779, a compressor whose capacity is adjusted by an inverter and A compressor is provided with overcurrent detection means for detecting the time when overcurrent flows on the input side and output side of the inverter, and when the overcurrent detection means detects overcurrent, the operating frequency of the compressor is changed to a low setting. It is known that the number of revolutions of the inverter is reduced and the drooping control is performed to suppress the flow of the overcurrent in the inverter, thereby effectively protecting the inverter from the overcurrent.
(発明が解決しようとする課題) ところで、圧縮機の容量を増減制御する場合、その容
量の変化段数を多段階に設定すれば、冷凍能力を冷凍負
荷により良好に対応できて、冷凍性能の向上を図ること
ができ、好ましい。(Problems to be solved by the invention) By the way, when controlling the capacity of the compressor to increase or decrease, if the number of stages of change in the capacity is set in multiple stages, the refrigerating capacity can be better responded to the refrigerating load and the refrigerating performance is improved. Can be achieved, which is preferable.
そこで、例えば2台の圧縮機を設け、一方の圧縮機を
インバータで容量制御すると共に、他方の圧縮機をアン
ロード機構で容量制御して、両圧縮機の合計容量を合計
容量を多段階に調整すれば、要求空調能力に対応する目
標容量値にほぼ制御することができ、比較的低価格でも
って冷凍性能の向上を図ることができる。Therefore, for example, two compressors are provided, the capacity of one compressor is controlled by an inverter, and the capacity of the other compressor is controlled by an unload mechanism, so that the total capacity of both compressors can be set in multiple levels. If adjusted, the target capacity value corresponding to the required air conditioning capacity can be almost controlled, and the refrigeration performance can be improved at a relatively low price.
而して、上記の如き2台の圧縮機を備えた冷凍装置に
おいて、インバータの過電流時での垂下制御を行う場
合、一方の圧縮機はインバータで比較的細かく、例えば
10%刻みに容量調整され、他方の圧縮機はアンロード機
構で例えば50%と100%とに比較的大きく容量調整され
る関係上、両圧縮機の合計容量値を過負荷保護として小
値に減少調整しても、インバータ側の圧縮機の容量値が
逆に大きく調整される場合があり、過電流保護を期し得
ない状況も生じる。例えば、垂下制御により合計容量値
を減少制御して、120%となった後、運転容量が減少し
て例えば90%に至った場合、当初ではインバータ側で20
%、アンロード機構側で100%を分担するにも拘らず、
運転容量の減少後では、インバータ側圧縮機で40%、ア
ンロード機構側圧縮機で50%を分担して、インバータで
は20%から40%の増大分、電流値が増大して、過電流保
護を行い得ない状況となる。Thus, in the refrigerating apparatus having the two compressors as described above, when drooping control is performed when the inverter is overcurrent, one compressor is relatively fine in the inverter, for example,
Since the capacity of each compressor is adjusted in 10% increments and the other compressor is adjusted to a relatively large capacity, for example, 50% and 100% by the unload mechanism, the total capacity value of both compressors is reduced to a small value for overload protection. In some cases, the capacity value of the compressor on the inverter side may be adjusted to a large value even if the reduction adjustment is performed, and a situation may occur in which overcurrent protection cannot be achieved. For example, if the total capacity value is controlled to decrease by droop control to reach 120%, and then the operating capacity decreases to, for example, 90%, initially the inverter side will set 20%.
%, Despite the fact that the unloading mechanism shares 100%,
After the operating capacity is reduced, the inverter side compressor will share 40% and the unload mechanism side compressor will share 50%, and the inverter will increase the current value by 20% to 40% and overcurrent protection. It is a situation that cannot be done.
本発明は斯かる点に鑑みてなされたものであり、その
目的は、上記の如く2台の圧縮機を各々インバータとア
ンロード機構とで容量制御する場合、インバータの垂下
制御時には、単に圧縮機の合計容量値を減少制御するの
ではなく、インバータ側と、アンロード機構側とに分け
て減少制御することにより、双方の圧縮機の合計容量を
調整する基本的構成に伴うインバータ電流値の増大を防
止して、インバータの垂下制御を確実に行い、装置の信
頼性の向上、及び装置の運転範囲の向上を図ることにあ
る。The present invention has been made in view of the above problems, and an object of the present invention is to simply control the capacity of two compressors by an inverter and an unload mechanism as described above, and to simply control the compressor during drooping of the inverter. Incrementing the inverter current value due to the basic configuration that adjusts the total capacity of both compressors by controlling the total capacity of both compressors by reducing the total capacity value of the inverter and unloading mechanism separately. Is to prevent drooping of the inverter, to improve the reliability of the device and to improve the operating range of the device.
(課題を解決するための手段) 上記目的を達成するため、本発明の具体的な解決手段
は、第1図に示すように、インバータ(15)により容量
調整される第1の圧縮機(1)と、アンロード機構(2
a)により容量調整される第2の圧縮機(2)と、該両
圧縮機(1),(2)の合計容量を多段階に調整するよ
う上記インバータ(15)及びアンロード機構(2a)を制
御する容量制御手段(50)とを備えた冷凍装置の過負荷
制御装置を前提とする。そして、上記第1の圧縮機
(1)のインバータ(15)に過電流が流れた時を検出す
る過電流時検出手段(55)とを設けている。加えて、該
過電流時検出手段(55)で検出した過電流検出時に、上
記容量制御手段(50)におけるインバータ(15)の出力
周波数の上限値をその過電流検出時よりも低い出力周波
数値に一旦制限すると共に、上記第2の圧縮機(2)の
アンロード機構(2a)の負荷状態の上限値をその過電流
検出時での負荷状態値に制限して、圧縮機(1),
(2)の合計容量を減少制御した後、所定時間毎にイン
バータ(15)の出力周波数の上記上限値を上昇させると
共に、該上限値がインバータ(15)の出力可能な最大周
波数になると容量制御手段(50)の両圧縮機(1),
(2)の制限を解除する垂下制御手段(56)とを設ける
構成としたものである。(Means for Solving the Problems) In order to achieve the above object, a concrete means for solving the problems of the present invention is, as shown in FIG. 1, a first compressor (1) whose capacity is adjusted by an inverter (15). ) And the unload mechanism (2
The second compressor (2) whose capacity is adjusted by a) and the inverter (15) and the unload mechanism (2a) so as to adjust the total capacity of both the compressors (1) and (2) in multiple stages. It is premised on an overload control device for a refrigeration system including a capacity control means (50) for controlling the above. Then, an overcurrent detection means (55) for detecting a time when an overcurrent flows through the inverter (15) of the first compressor (1) is provided. In addition, when the overcurrent detected by the overcurrent detection means (55) is detected, the upper limit value of the output frequency of the inverter (15) in the capacity control means (50) is set to an output frequency value lower than that during the overcurrent detection. Once, the upper limit value of the load state of the unload mechanism (2a) of the second compressor (2) is limited to the load state value at the time of detecting the overcurrent, and the compressor (1),
After the total capacity of (2) is controlled to decrease, the upper limit value of the output frequency of the inverter (15) is increased every predetermined time, and when the upper limit value reaches the maximum frequency that can be output by the inverter (15), capacity control is performed. Both compressors (1) of the means (50),
The drooping control means (56) for canceling the restriction (2) is provided.
(作用) 以上の構成により、本発明では、インバータ(15)に
過電流が流れない通常時では、インバータ(15)及びア
ンロード機構(2a)が容量制御手段(50)で制御され
て、両圧縮機(1),(2)の合計容量値が多段階に調
整されて、略要求冷凍能力値となる。(Operation) According to the present invention, according to the present invention, the inverter (15) and the unload mechanism (2a) are controlled by the capacity control means (50) during the normal time when an overcurrent does not flow in the inverter (15). The total capacity value of the compressors (1) and (2) is adjusted in multiple stages to become a substantially required refrigerating capacity value.
一方、インバータ(15)に過電流が流れた垂下制御の
必要時には、上記容量制御手段(50)に優先して垂下制
御手段(56)が作動して、圧縮機(1),(2)の合計
容量値が減少制御されるので、インバータ(15)の過電
流の流通が有効に抑制ないし防止される。On the other hand, when droop control is required when an overcurrent flows in the inverter (15), the droop control means (56) operates in preference to the capacity control means (50) to operate the compressors (1) and (2). Since the total capacitance value is controlled to be reduced, the overcurrent of the inverter (15) is effectively suppressed or prevented.
その場合、上記垂下制御手段(56)による合計容量の
減少制御は、インバータ(15)の出力周波数の上限値
を、その過電流検出時(出力周波数=100%)よりも低
い出力周波数値(例えば50%)に制限すると共に、上記
第2の圧縮機(2)のアンロード機構(2a)の負荷状態
の上限値をその過電流検出時での負荷状態値(例えば10
0%)に制限しつつ行われるので、この合計容量の減少
制御に伴いアンロード機構(2a)の負荷状態が例えば50
%となっても、インバータの(15)の出力周波数は例え
ば80%になる状況でも強制的に50%に制限されて、その
分、インバータ(15)の電流値の増大を有効に抑制する
ことができる。その後、上記インバータ(15)の出力周
波数の上限値を所定時間毎に上昇させ、該上限値がイン
バータ(15)の出力可能な最大周波数になると両圧縮機
(1),(2)の制限を解除して解除して通常制御に移
行することになる。In this case, the drooping control means (56) controls the reduction of the total capacity by setting the upper limit value of the output frequency of the inverter (15) to an output frequency value lower than that at the time of detecting the overcurrent (output frequency = 100%) (for example, 50%), and the upper limit value of the load state of the unload mechanism (2a) of the second compressor (2) is set to the load state value when the overcurrent is detected (for example, 10%).
0%), the load state of the unload mechanism (2a) is, for example, 50% due to this total capacity reduction control.
%, The output frequency of the inverter (15) is compulsorily limited to 50% even when the output frequency of the inverter (15) is, for example, 80%, and the increase in the current value of the inverter (15) is effectively suppressed accordingly. You can After that, the upper limit value of the output frequency of the inverter (15) is increased every predetermined time, and when the upper limit value reaches the maximum frequency that the inverter (15) can output, the limits of both compressors (1) and (2) are set. It will be released and released to shift to normal control.
(実施例) 以下、本発明の実施例を第2図以下の図面に基いて説
明する。(Embodiment) An embodiment of the present invention will be described below with reference to the drawings starting from FIG.
第2図は本発明をマルチ型式の空気調和装置に適用し
た実施例を示し、(A)は室外ユニット、(B)〜
(F)は同一内部構成の5台の室内ユニットであって、
上記室外ユニット(A)の内部には、互いに並列に接続
された第1の圧縮機(1)及び第2の圧縮機(2)と、
四路切換弁(3)と、室外送風ファン(4a)を有する室
外熱交換器(4)と、膨張弁(5)とが備えられ、該各
機器(1)〜(5)は各々冷媒配管(6)…で冷媒の流
通可能に接続されている。また、上記各室内ユニット
(B)〜(F)は各々、室内送風ファン(10a)を有す
る室内熱交換器(10)と、膨張弁(11)とを備え、該膨
張弁(11)は、その弁開度が電気的に増減調整できる空
調能力調整用の室内電動膨張弁で構成されていて、該各
機器(10),(11)は冷媒配管(12)…で冷媒の流通可
能に接続されている。FIG. 2 shows an embodiment in which the present invention is applied to a multi-type air conditioner, where (A) is an outdoor unit and (B)-
(F) is five indoor units of the same internal structure,
Inside the outdoor unit (A), a first compressor (1) and a second compressor (2) connected in parallel to each other,
A four-way switching valve (3), an outdoor heat exchanger (4) having an outdoor blower fan (4a), and an expansion valve (5) are provided, and each of the devices (1) to (5) is a refrigerant pipe. (6) ... Are connected so that the refrigerant can flow. Further, each of the indoor units (B) to (F) includes an indoor heat exchanger (10) having an indoor blower fan (10a) and an expansion valve (11), and the expansion valve (11) includes Each of the devices (10) and (11) is connected to a refrigerant pipe (12) so that the refrigerant can flow therethrough. Has been done.
そして、上記5台の室内ユニット(B)〜(F)は、
各々冷媒配管(13)…で互いに並列に接続されて上記室
外ユニット(A)に冷媒の循環可能に接続されて冷媒循
環系統(14)が形成されていて、冷房運転時には、四路
切換弁(3)を図中破線の如く切換えて冷媒を図中破線
矢印の如く循環させることにより、各室内熱交換器(1
0)…で室内から吸熱した熱量を室外熱交換器(4)で
外気に放熱することを繰返して各室内を冷房する一方、
暖房運転時には、四路切換弁(3)を図中実線の如く切
換えて冷媒を図中実線矢印の如く循環させることによ
り、熱量の授受を上記とは逆にして、室内を暖房するよ
うにしている。The five indoor units (B) to (F) are
Refrigerant circulation systems (14) are formed by being connected in parallel to each other by refrigerant pipes (13) and being circulated to the outdoor unit (A) so that a refrigerant circulation system (14) is formed. 3) is switched as indicated by the broken line in the figure and the refrigerant is circulated as indicated by the dashed arrow in the figure, so that each indoor heat exchanger (1
The heat quantity absorbed from the room in 0) is repeatedly radiated to the outside air in the outdoor heat exchanger (4) to cool each room, while
During the heating operation, the four-way switching valve (3) is switched as shown by the solid line in the figure to circulate the refrigerant as shown by the solid line arrow in the figure, so that the exchange of heat is reversed and the room is heated. There is.
また、上記第1の圧縮機(1)にはインバータ(15)
が接続されていて、該インバータ(15)の30%から100
%まで10%刻みの周波数設定信号の出力により、第1の
圧縮機(1)の運転周波数を8段階に高低調整して、そ
の容量を複数段階(停止時を含んで9段階)に増減調整
するようにしている。In addition, the first compressor (1) has an inverter (15).
Is connected, and 30% to 100% of the inverter (15)
%, The operating frequency of the first compressor (1) is adjusted to 8 levels by the output of the frequency setting signal in 10% steps, and the capacity is adjusted to increase or decrease in multiple steps (9 steps including stop). I am trying to do it.
また、第2の圧縮機(2)は、第3図に詳示すよう
に、密閉ケーシング(2b)に吸入口(2c)と吐出口(2
d)とが形成され、該密閉ケーシング(2b)内には、モ
ータ(2e)により駆動軸(2f)を介して駆動されるピス
トン(2g)が配置され、該ピストン(2g)により圧送さ
れるガス(吐出ガス)を吐出ガス通路(2h)から該吐出
ガス通路(2h)に開口する吐出ガス管(2i)を介して、
上記吐出口(2d)に導くようになっている。そして、上
記吐出ガス通路(2h)の途中には、アンロード機構(2
a)が配置され、該アンロード機構(2a)は、吐出ガス
通路(2h)の隔壁(2j)に設けた開口(2k)を開閉する
弁体(21)と、該弁体(21)を開弁方向に付勢するスプ
リング(2m)と、弁体(21)の後方に圧力室(2n)とを
有する。そして、上記弁体(21)は、圧力室(2n)連通
するパイロット圧導入通路(16)を設けたパイロット電
磁弁(17)の閉時に高圧(吐出ガス圧)が作用すること
により、上記開口(2k)を弁体(21)で閉じて、吐出ガ
スの全量を吐出口(2d)に導き、第2圧縮機(2)の容
量をフルロード(100%にする一方、パイロット電磁弁
(17)の開時には低圧が作用することにより、スプリン
グ(2m)の付勢力で弁体(21)を図中右方向に付勢して
開口(2k)を開き、吐出ガスの一部を該開口(2k)を介
して密閉ケーシング(2b)内下部にバイパスして、第2
圧縮機(2)の容量を50%にアンロードするものであ
る。The second compressor (2) has a suction port (2c) and a discharge port (2) in a closed casing (2b), as shown in detail in FIG.
d) is formed, and a piston (2g) driven by a motor (2e) via a drive shaft (2f) is arranged in the closed casing (2b), and is pumped by the piston (2g). Gas (discharge gas) from the discharge gas passage (2h) through the discharge gas pipe (2i) opening to the discharge gas passage (2h),
It is designed to lead to the discharge port (2d). And, in the middle of the discharge gas passage (2h), the unloading mechanism (2
a) is arranged, and the unload mechanism (2a) includes a valve body (21) for opening and closing an opening (2k) provided in the partition wall (2j) of the discharge gas passage (2h), and the valve body (21). A spring (2m) that urges in the valve opening direction and a pressure chamber (2n) are provided behind the valve body (21). The valve body (21) has a high pressure (discharging gas pressure) when the pilot solenoid valve (17) having the pilot pressure introducing passage (16) communicating with the pressure chamber (2n) is closed. (2k) is closed by the valve body (21), the total amount of discharge gas is guided to the discharge port (2d), and the capacity of the second compressor (2) is set to full load (100%), while the pilot solenoid valve (17 ) Is opened, the valve (21) is urged to the right in the figure by the urging force of the spring (2m) to open the opening (2k), and a part of the discharge gas is discharged from the opening (2k). 2k) to bypass the inside of the closed casing (2b) to the second
It unloads the capacity of the compressor (2) to 50%.
また、第2図において、(20)は四路切換弁(3)前
後の冷媒配管(6),(6)(吐出管と吸入管)を接続
する均圧ホットバイパス回路であって、該バイパス回路
(20)には、冷房運転状態での低負荷時及び室外熱交換
器(4)の除霜運転時等に開作動するホットガス電磁弁
(21)が介設されている。Further, in FIG. 2, (20) is a pressure equalizing hot bypass circuit that connects the refrigerant pipes (6) and (6) (the discharge pipe and the suction pipe) before and after the four-way switching valve (3). The circuit (20) is provided with a hot gas solenoid valve (21) that is opened when the load is low in the cooling operation state, the defrosting operation of the outdoor heat exchanger (4), and the like.
さらに、(22)は暖房運転時に吐出管となる冷媒配管
(6)に接続された暖房過負荷時バイパス回路であっ
て、該バイパス回路(22)には、補助コンデンサ(23)
及び、冷媒の高圧時に開く高圧制御弁(24)が介設され
ており、暖房過負荷時に圧縮機(1),(2)からの冷
媒を該バイパス回路(22)を介して各室内熱交換器(1
0)…をバイパスして、各室内熱交換器(10)…下流側
の冷媒配管(6)にバイパスするようにしている。Further, (22) is a heating overload bypass circuit connected to the refrigerant pipe (6) serving as a discharge pipe during the heating operation, and the bypass circuit (22) includes an auxiliary capacitor (23).
Further, a high pressure control valve (24) which is opened when the pressure of the refrigerant is high is interposed, and the refrigerant from the compressors (1) and (2) is exchanged with the heat of each room through the bypass circuit (22) at the time of heating overload. Bowl (1
0) are bypassed, and each indoor heat exchanger (10) is bypassed to the refrigerant pipe (6) on the downstream side.
加えて、(25)は上記暖房過負荷時バイパス回路(2
2)の補助コンデンサ(23)下流側を、四路切換弁
(3)下流側の冷媒配管(6)(吸入管)に接続するリ
キッドインジェクションバイパス回路であって、該リキ
ッドインジェクションバイパス回路(25)には圧縮機
(1),(2)の作動に連動して開閉するインジェクシ
ョン用電磁弁(26)と、膨張弁(27)とが介設されてい
る。In addition, (25) is the bypass circuit (2
A liquid injection bypass circuit for connecting the downstream side of the auxiliary condenser (23) of 2) to the refrigerant pipe (6) (intake pipe) on the downstream side of the four-way switching valve (3), the liquid injection bypass circuit (25). An electromagnetic valve (26) for injection, which opens and closes in conjunction with the operation of the compressors (1) and (2), and an expansion valve (27) are interposed in the engine.
また、(30)はレシーバ、(31)はアキュムレータ、
(32)は過冷却コイル、(33)は油分離器であって、該
油分離器(33)で分離された潤滑油は油通路(34)を介
して両圧縮機(1),(2)に戻される。Also, (30) is the receiver, (31) is the accumulator,
(32) is a supercooling coil, (33) is an oil separator, and the lubricating oil separated by the oil separator (33) passes through an oil passage (34) to both compressors (1), (2 ).
さらに、各室内ユニット(B)〜(F)において、
(TH1)は対応する室内の空気の温度(吸込空気温度)
を検出する室温センサ、(TH2)及び(TH3)は各々冷房
運転時に蒸発器として作用する室内熱交換器(10)…前
後の冷媒温度をけ検出する温度センサである。また、室
外ユニット(A)において、インバータ(15)には、そ
の二次電流の過電流時を検出する過電流時検出手段とし
ての過電流検出器(55)が内蔵されている。また、室外
ユニット(A)において、(TH4)は第1及び第2圧縮
機(1),(2)の冷媒吐出温度を検出する温度セン
サ、(TH5)は暖房運転時に室外熱交換器(4)での冷
媒の蒸発温度を検出する蒸発温度センサ、(TH6)は第
1及び第2圧縮機(1),(2)への吸入ガス温度を検
出する吸入ガス温度センサである。また、(P1)は暖房
運転時にには吐出ガス圧力を、冷房運転時には吸入ガス
圧力を各々検出する圧力センサ、(HPS)は圧縮機保護
用の高圧圧力開閉器である。Furthermore, in each indoor unit (B)-(F),
(TH1) is the temperature of the corresponding indoor air (suction air temperature)
Room temperature sensors for detecting the temperature, (TH2) and (TH3) are temperature sensors for detecting the temperature of the refrigerant before and after the indoor heat exchanger (10), which acts as an evaporator during the cooling operation. Further, in the outdoor unit (A), the inverter (15) has a built-in overcurrent detector (55) as overcurrent detection means for detecting an overcurrent of the secondary current. In the outdoor unit (A), (TH4) is a temperature sensor that detects the refrigerant discharge temperature of the first and second compressors (1) and (2), and (TH5) is the outdoor heat exchanger (4) during heating operation. ) Is an evaporation temperature sensor for detecting the evaporation temperature of the refrigerant, and (TH6) is an intake gas temperature sensor for detecting the intake gas temperature to the first and second compressors (1), (2). Further, (P1) is a pressure sensor that detects the discharge gas pressure during heating operation, and the suction gas pressure during cooling operation, and (HPS) is a high pressure switch for protecting the compressor.
次に、上記第1及び第2の圧縮機(1),(2)の容
量制御を冷房運転時を例に挙げて第4図の制御フローに
基いて説明する。尚、この容量制御は、室外ユニット
(A)内に備える室外制御部(図示せず)により行われ
る。Next, the capacity control of the first and second compressors (1), (2) will be described based on the control flow of FIG. 4 by taking the cooling operation as an example. Note that this capacity control is performed by an outdoor control unit (not shown) provided in the outdoor unit (A).
第4図において、スタートして、ステップS1で圧力セ
ンサ(P1)により検出した吸入空気量ガス圧力を担当飽
和温度に換算して得られる冷媒温度T2、つまり蒸発温度
(暖房運転時には冷媒の凝縮温度)を検出した後、第1
及び第2の圧縮機(1),(2)の合計容量のフィード
バック制御としてPI制御(比例−積分制御)を行うこと
とし、ステップS2で圧縮機(1),(2)の目標合計容
量L1を、上記蒸発温度T2とその目標値T2Oとの偏差の,
今回と前回の値e(t),e(t−Δt)に基いて、蒸発
温度T2とその目標値T2oになるよう下記式 L1=LO+Kc[e(t)−e(t−Δt) +{Δt/2Ti}{e(t)+e(t−Δt)}] Lo;現在の合計容量 Kc;ゲイン(定数) Ti;積分定数 Δt;サンプリング時間 で演算する。In FIG. 4, after starting, the refrigerant temperature T 2 obtained by converting the intake air amount gas pressure detected by the pressure sensor (P1) to the saturation temperature in charge at step S 1 , that is, the evaporation temperature (the refrigerant temperature during heating operation After detecting the condensation temperature)
And PI control (proportional-integral control) is performed as feedback control of the total capacity of the second compressors (1) and (2), and the target total capacity of the compressors (1) and (2) in step S2. L 1 is the difference between the evaporation temperature T 2 and its target value T 2O ,
Current and previous values e (t), e (t -Δt) to the basis, the following equation L 1 = L O + Kc so that the evaporation temperature T 2 to the target value T 2 o [e (t) -e ( t-Δt) + {Δt / 2Ti} {e (t) + e (t-Δt)}] Lo; current total capacity Kc; gain (constant) Ti; integration constant Δt; sampling time.
しかる後、ステップS3で下記に示す第1表の合計容量
マップに基いて上記合計目標容量L1に対応した圧縮機
(1),(2)の合計容量を把握して、この合計容量に
対応する下記の第2表の各圧縮機(1),(2)の実際
の容量マップに基いて第1の圧縮機(1)の容量をイン
バータ(15)で制御すると共に、第2の圧縮機(2)の
容量をアンロード機構(2a)で調整する。そして、ステ
ップS4でサンプリング時間Δtの経過を待って上記ステ
ップS1に戻って、以上の動作を繰返す。Then, in step S 3 , the total capacity of the compressors (1) and (2) corresponding to the above total target capacity L 1 is grasped based on the total capacity map of Table 1 shown below, and this total capacity is calculated. The capacity of the first compressor (1) is controlled by the inverter (15) based on the corresponding actual capacity maps of the compressors (1) and (2) in Table 2 below, and the second compression Adjust the capacity of the machine (2) with the unload mechanism (2a). Then, in step S 4 , after waiting for the elapse of the sampling time Δt, the process returns to step S 1 and the above operation is repeated.
ここに、上記第1表の合計容量マップは、圧縮機
(1),(2)の制御すべき合計容量が零値の場合と、
30%値から漸次10%づつ増大して200%値に至る多段階
(19段階)に区分されていると共に、合計目標容量L1の
範囲の容量の増大時と減少時とで区別されている。 Here, the total capacity map in Table 1 above shows that the total capacity of the compressors (1) and (2) to be controlled is zero.
It is divided into multiple stages (19 stages) from the 30% value to the 200% value by gradually increasing by 10%, and is distinguished when the capacity in the range of the total target capacity L 1 is increasing and when it is decreasing. .
また、上記第2表の各圧縮機(1),(2)の容量マ
ップは、合計容量が30%から100%までの範囲におい
て、第1の圧縮機(1)の容量が10%刻みで増大すると
共に、第2の圧縮機(2)の容量が0%(停止)を保持
する第1マップと、合計容量が80%から150%までの範
囲において、第1の圧縮機(1)の容量が上記と同様に
10%刻みで増大し、第2の圧縮機(2)の容量が50%を
保持する第2のマップと、合計容量が130%から200%ま
での範囲において、第1の圧縮機(1)の容量が10%刻
みで増大し、第2の圧縮機(2)の容量が100%を保持
する第3マップとからなる。そして、上記第1マップで
合計容量が増減し、第1の圧縮機(1)の容量が最大値
(100%)の状態で、合計容量が110%に増大すると、第
2マップに移行して、第2の圧縮機(2)の容量がアン
ロード機構(2a)で0%から50%に増大調整されると共
に、第1の圧縮機(1)の容量がインバータ(15)で10
0%から60%に減少調整され、その後は、合計容量の増
減変化に応じてこの第2マップの各容量値を取り、第1
の圧縮機(1)の容量値が最小値の30%の状態で合計容
量が80%から70%に減少する場合には、上記第1マップ
に移行して、第2圧縮機(2)の容量が0%に調整され
ると共に、第1の圧縮機(1)の容量がインバータ(1
5)で70%に調整される。In addition, the capacity maps of the compressors (1) and (2) in Table 2 above show that when the total capacity is in the range of 30% to 100%, the capacity of the first compressor (1) is in steps of 10%. In the first map where the capacity of the second compressor (2) increases and the capacity of the second compressor (0) keeps 0% (stop), and the total capacity of the first compressor (1) is 80% to 150%. Capacity is the same as above
In the second map where the capacity of the second compressor (2) keeps 50% and increases in 10% increments, and the total capacity ranges from 130% to 200%, the first compressor (1) The capacity of the second compressor (2) increases by 10%, and the capacity of the second compressor (2) holds 100%. Then, when the total capacity increases or decreases in the first map and the total capacity increases to 110% in the state where the capacity of the first compressor (1) is the maximum value (100%), the process moves to the second map. , The capacity of the second compressor (2) is adjusted to be increased from 0% to 50% by the unload mechanism (2a), and the capacity of the first compressor (1) is adjusted by the inverter (15) to 10%.
It is adjusted to decrease from 0% to 60%, and then each capacity value of this second map is taken according to the increase and decrease of the total capacity,
When the total capacity decreases from 80% to 70% when the capacity value of the compressor (1) is 30% of the minimum value, the process shifts to the first map and the second compressor (2) When the capacity is adjusted to 0%, the capacity of the first compressor (1) is
Adjusted to 70% in 5).
同様に、第2マップで合計容量が増減し、第1の圧縮
機(1)の容量が最大値(100%)の状態で、合計容量
が150%から160%に増大すると、第3マップに移行し
て、第2の圧縮機(2)の容量がアンロード機構(2a)
で50%から100%に増大調整されると共に、第1の圧縮
機(1)の容量がインバータ(15)で100%から60%に
減少調整される。その後は、合計容量の増減変化に応じ
てこの第3マップの各容量値を取り、第1の圧縮機
(1)の容量値が最小値の30%の状態で合計容量が130
%から120%に減少する場合には、上記第2マップに移
行して、第2の圧縮機(2)の容量が100%から50%に
減少調整されると共に、第1の圧縮機(1)の容量がイ
ンバータ(15)で70%に調整される。Similarly, if the total capacity increases or decreases on the second map and the total capacity increases from 150% to 160% with the capacity of the first compressor (1) at the maximum value (100%), the third map will appear. After the transition, the capacity of the second compressor (2) becomes the unload mechanism (2a).
The capacity of the first compressor (1) is adjusted to be reduced from 100% to 60% by the inverter (15) while being adjusted to be increased from 50% to 100%. After that, each capacity value of this third map is taken according to the increase or decrease in the total capacity, and the total capacity is 130% when the capacity value of the first compressor (1) is 30% of the minimum value.
When the first compressor (1) is reduced from 120% to 120%, the second map is moved to adjust the capacity of the second compressor (2) from 100% to 50%. ) Capacity is adjusted to 70% by the inverter (15).
従って、上記第2表から判る如く、圧縮機(1),
(2)と合計容量が80%から70%に減少する場合には、
第1の圧縮機(1)の容量は30%から70%に増大する。
また、圧縮機(1),(2)の合計容量が130%から120
%に減少する場合にも、第1の圧縮機(1)の容量は30
%から70%に増大する特性となっている。Therefore, as can be seen from Table 2 above, the compressor (1),
(2) And when the total capacity decreases from 80% to 70%,
The capacity of the first compressor (1) increases from 30% to 70%.
The total capacity of the compressors (1) and (2) is 130% to 120%.
The capacity of the first compressor (1) is 30 even if it is reduced to 30%.
The characteristic is to increase from 70% to 70%.
よって、上記第4図の制御フローにより、第1及び第
2の圧縮機(1),(2)の合計容量を多段階に調整す
るよう上記インバータ(15)及びアンロード機構(2a)
を冷媒の蒸発温度に応じて作動制御するようにした容量
制御手段(50)を構成している。Therefore, according to the control flow of FIG. 4, the inverter (15) and the unload mechanism (2a) are adjusted so as to adjust the total capacity of the first and second compressors (1) and (2) in multiple stages.
The capacity control means (50) is configured to control the operation of the refrigerant according to the evaporation temperature of the refrigerant.
続いて、上記インバータ(15)の垂下制御を第5図の
状態遷移図に基いて説明する。尚、この垂下制御も、室
外ユニット(A)内に備える室外制御部(図示せず)に
より行われる。Next, the drooping control of the inverter (15) will be described based on the state transition diagram of FIG. Note that this drooping control is also performed by an outdoor control unit (not shown) provided in the outdoor unit (A).
第5図の垂下制御は、インバータ(15)の過電流検出
器(55)からの過電流検出信号の入力時、つまり圧縮機
(1),(2)の合計容量Fmaxの200%時に、上記第4
図の制御フローに優先して開始される。そして、通常は
アンロード機構(2a)を100%に保持すると共にインバ
ータ(15)を50%に調整して、合計容量Fmaxを150%に
制御し、その後は所定時間Tが経過する毎にインバータ
(15)で合計容量Fmaxを10%づつ増大させることを繰返
す。The drooping control shown in FIG. 5 is performed when the overcurrent detection signal from the overcurrent detector (55) of the inverter (15) is input, that is, when the total capacity Fmax of the compressors (1) and (2) is 200%. Fourth
It is started with priority over the control flow shown in the figure. Then, normally, the unload mechanism (2a) is held at 100%, the inverter (15) is adjusted to 50%, the total capacity Fmax is controlled to 150%, and thereafter, the inverter is set every time a predetermined time T elapses. In (15), increase the total capacity Fmax by 10% is repeated.
そして、以上の各状態で、負荷の減少に伴いアンロー
ド機構(2a)が100%から50%に低下すると、その分、
合計容量Fmaxを減少させる(インバータ(15)の周波数
はそのまま保持する)と共に、更にこの各状態でアンロ
ード機構(2a)が続いて50%から0%に低下すると、合
計容量Fmaxをその分減少させて、第1の圧縮機(1)の
容量とする。In each of the above states, when the unload mechanism (2a) decreases from 100% to 50% as the load decreases,
When the total capacity Fmax is reduced (the frequency of the inverter (15) is kept as it is) and the unload mechanism (2a) continues to decrease from 50% to 0% in each state, the total capacity Fmax is reduced accordingly. Then, the capacity of the first compressor (1) is obtained.
一方、上記の如く所定時間Tの経過毎の合計容量Fmax
の10%の増大に伴い、アンロード機構(2a)の100%、5
0%の各状態で合計容量Fmaxが各々190%、140%、90%
に至ると、合計容量Fmaxを増大させて200%に制御す
る。つまり、一旦インバータ(15)の出力を制限した
後、該インバータ(15)の上限値を所定時間毎に上昇さ
せ、該上限値がインバータ(15)の出力可能な最大周波
数になると両圧縮機(1),(2)の制限を解除して通
常制御に移行することになる。On the other hand, as described above, the total capacity Fmax at each elapse of the predetermined time T
100% of unloading mechanism (2a), 5
Total capacity Fmax is 190%, 140%, 90% in each state of 0%
Then, the total capacity Fmax is increased to 200%. In other words, once the output of the inverter (15) is limited, the upper limit value of the inverter (15) is increased at predetermined time intervals, and when the upper limit value reaches the maximum frequency that the inverter (15) can output, both compressors ( The restrictions of 1) and (2) will be removed and control will shift to normal control.
よって、上記第5図のインバータ(15)の垂下制御に
より、過電流時検出器(55)で検出した過電流検出時
(インバータ(15)=100%、アンロード機構(2a)=1
00%時)には、上記容量制御手段(50)に優先して、イ
ンバータ(15)の出力周波数の上限値をその過電流検出
時(100%)よりも低い出力周波数値(50%)に制限す
ると共に、第2の圧縮機(2)のアンロード機構(2a)
の負荷状態値を、その過電流検出時での負荷状態値(10
0%)から運転負荷が減少する毎に漸次50%、0%に減
少制御、つまり負荷状態値の上限値を過電流検出時の負
荷状態値(100%)に制限して、圧縮機(1),(2)
の合計容量を減少制御するようにした垂下制御手段(5
6)を構成している。更に、該垂下制御手段(56)は、
所定時間毎にインバータ(15)の出力周波数の上記上限
値を10%毎に上昇されると共に、該上限値がインバータ
(15)の出力可能な最大周波数になると容量制御手段
(50)の両圧縮機(1),(2)の制限を解除するよう
に構成されている。Therefore, when the overcurrent detected by the overcurrent detector (55) is detected by the droop control of the inverter (15) in Fig. 5 above (inverter (15) = 100%, unload mechanism (2a) = 1).
00%), the upper limit value of the output frequency of the inverter (15) is set to the output frequency value (50%) lower than that at the time of detecting the overcurrent (100%) in preference to the capacity control means (50). Limiting and unloading mechanism (2a) of the second compressor (2)
The load state value of the load state value (10
Each time the operating load decreases from 0%), the control is gradually reduced to 50% and 0%, that is, the upper limit value of the load state value is limited to the load state value (100%) at the time of overcurrent detection, and the compressor (1 ), (2)
Droop control means (5
6) constitutes. Furthermore, the drooping control means (56),
The upper limit of the output frequency of the inverter (15) is increased every 10% every predetermined time, and when the upper limit reaches the maximum frequency that can be output by the inverter (15), both compressions of the capacity control means (50) are performed. It is configured to remove the restrictions on the machines (1) and (2).
したがって、上記実施例においては、インバータ(1
5)に過電流の流通が無い通常時には、インバータ(1
5)及びアンロード機構(2a)が容量制御手段(50)で
作動制御されて、容量の増大制御時には、第1の圧縮機
(1)の容量がインバータ(15)で順次増大し、100%
に至る毎に、第2の圧縮機(2)がアンロード機構(2
a)で容量を順次→50%、50→100%になる。一方、容量
の減少制御時には、第1の圧縮機(1)の容量が10%づ
つ順次減少し、30%に至る毎に、第2の圧縮機(2)の
容量が順次100→50%、50→0%に減少する。その結
果、合計能力Fmaxが細かく多段階に調整されて、ほぼ要
求空調能力に対応する値となるので、各室内が良好に空
調される。Therefore, in the above embodiment, the inverter (1
5) When there is no overcurrent flow during normal operation, the inverter (1
5) and the unload mechanism (2a) are operated and controlled by the capacity control means (50), and at the time of capacity increase control, the capacity of the first compressor (1) is sequentially increased by the inverter (15) to reach 100%.
The second compressor (2) causes the unloading mechanism (2
In step a), the capacities are changed from 50% to 50% and 50% to 100%. On the other hand, during the capacity reduction control, the capacity of the first compressor (1) is sequentially decreased by 10%, and the capacity of the second compressor (2) is sequentially increased from 100% to 50% every 30%. It decreases from 50 to 0%. As a result, the total capacity Fmax is finely adjusted in multiple stages and becomes a value that substantially corresponds to the required air conditioning capacity, so that each room is conditioned well.
一方、インバータ(15)に過電流が流れた場合、垂下
制御手段(56)が容量制御手段(50)に優先して作動し
て、例えば第1及び第2の圧縮機(1),(2)の容量
が100%の状態では、インバータ(15)の出力周波数の
上限値がこの過電流検出時100%)よりも低い50%に制
限されて、第1の圧縮機(1)の容量が50%に減少制御
されると共に、アンロード機構(2a)の負荷状態の上限
値がその過電流検出時での負荷状態値(100%)に制限
される。その結果、圧縮機(1),(2)の合計容量
を、この過電流時当初では150%に減少し、その後は所
定時間T経過毎にインバータ(15)で10%づつ増大す
る。On the other hand, when an overcurrent flows in the inverter (15), the drooping control means (56) operates in preference to the capacity control means (50), and, for example, the first and second compressors (1), (2 ) Is 100%, the upper limit of the output frequency of the inverter (15) is limited to 50%, which is lower than 100% when this overcurrent is detected, and the capacity of the first compressor (1) becomes While being controlled to be reduced to 50%, the upper limit value of the load state of the unload mechanism (2a) is limited to the load state value (100%) when the overcurrent is detected. As a result, the total capacity of the compressors (1) and (2) is reduced to 150% at the beginning of this overcurrent, and thereafter the inverter (15) increases by 10% at every elapse of a predetermined time T.
以上の状態において、例えば過電流時当初(Fmax=15
0%時)で目標合計容量L1が減少した場合には、この減
少に伴い第1の圧縮機(1)の容量も減少制御される
が、上記目標合計容量L1が120%に算出された場合に
は、第2の圧縮機(2)がアンロード機構(2a)で50%
に減少制御されると共に、通常では第1の圧縮機(1)
の容量が容量制御氏手段(50)で70%に増大制御され
る。しかし、この場合には、垂下制御手段(56)によ
り、インバータ(15)の出力周波数の上限値が50%に制
限されているので、第1の圧縮機(1)の容量も50%に
制限されて、上記70%には増大しない。よって、その
分、インバータ(15)の電流値が増大が抑制されるの
で、インバータ(15)は過負荷に対して有効に保護され
ることになる。In the above state, for example, at the beginning of overcurrent (Fmax = 15
When the target total capacity L 1 decreases at 0%), the capacity of the first compressor (1) is also controlled to decrease with this decrease, but the target total capacity L 1 is calculated to be 120%. If the second compressor (2) is unloading mechanism (2a) 50%
The first compressor (1)
The capacity is controlled to 70% by capacity control means (50). However, in this case, since the upper limit value of the output frequency of the inverter (15) is limited to 50% by the drooping control means (56), the capacity of the first compressor (1) is also limited to 50%. The above does not increase to 70%. Therefore, the increase in the current value of the inverter (15) is suppressed by that amount, so that the inverter (15) is effectively protected against overload.
以上、アンロード機構(2a)の負荷状態値が100%か
ら50%に減少する場合を例に挙げて説明したが、その
他、50%から0%に減少する場合も上記と同様である。Although the case where the load state value of the unload mechanism (2a) is reduced from 100% to 50% has been described above as an example, the same applies to the case where the load state value is reduced from 50% to 0%.
(発明の効果) 以上説明したように、本発明の冷凍装置の過負荷制御
装置によれば、インバータとアンロード機構とで各々容
量調整される二台の圧縮機を備えた場合、上記インバー
タの垂下制御時には、各圧縮機の容量を別々に調整し
て、インバータの出力周波数の上限値を予め制限したの
で、アンロード機構側の圧縮機容量が減少しインバータ
側の圧縮機容量が増大するモード時でも、このインバー
タ側圧縮機の容量の増大を効果的に抑制して、該インバ
ータに対する過負荷保護を有効に行うことができる。(Effects of the Invention) As described above, according to the overload control device for a refrigeration system of the present invention, when two compressors each having a capacity adjusted by an inverter and an unload mechanism are provided, During droop control, the capacity of each compressor is adjusted separately to limit the upper limit of the output frequency of the inverter in advance, so the compressor capacity on the unload mechanism side decreases and the compressor capacity on the inverter side increases. Even at this time, it is possible to effectively suppress the increase in the capacity of the compressor on the inverter side and effectively perform the overload protection for the inverter.
また、上記インバータの出力周波数を制限した後、徐
々に周波数の上限値を増大させるので、通常制御に迅速
に近付けることができ、快適性の向上を図ることができ
る。Moreover, since the upper limit value of the frequency is gradually increased after the output frequency of the inverter is limited, the normal control can be quickly approached, and the comfort can be improved.
第1図は本発明の構成を示すブロック図である。第2図
ないし第5図は本発明の実施例を示し、第2図は冷媒配
管系統図、第3図は第2の圧縮機の具体的構成図、第4
図は圧縮機の合計容量の制御を示すフローチャート図、
第5図はインバータの垂下制御を示す状態遷移図であ
る。 (1)……第1の圧縮機、(2)……第2の圧縮機、
(2a)……アンロード機構、(15)……インバータ、
(50)……容量制御手段、(55)……過電流時検出器、
(56)……垂下制御手段。FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 5 show an embodiment of the present invention, FIG. 2 is a refrigerant piping system diagram, FIG. 3 is a concrete configuration diagram of a second compressor, and FIG.
The figure is a flow chart showing the control of the total capacity of the compressor.
FIG. 5 is a state transition diagram showing the drooping control of the inverter. (1) ... first compressor, (2) ... second compressor,
(2a) …… Unload mechanism, (15) …… Inverter,
(50) …… Capacity control means, (55) …… Overcurrent detector,
(56) …… Drunk control means.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−71967(JP,A) 実開 昭60−92059(JP,U) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-71967 (JP, A) Actual development: S60-92059 (JP, U)
Claims (1)
1の圧縮機(1)と、 アンロード機構(2a)により容量調整される第2の圧縮
機(2)と、 該両圧縮機(1),(2)の合計容量を多段階に調整す
るよう上記インバータ(15)及びアンロード機構(2a)
を制御する容量制御手段(50)とを備えるとともに、 上記第1の圧縮機(1)のインバータ(15)に過電流が
流れた時を検出する過電流時検出手段(55)と、 該過電流時検出手段(55)で検出した過電流検出時に、
上記容量制御手段(50)におけるインバータ(15)の出
力周波数の上限値をその過電流検出時よりも低い出力周
波数値に一旦制限すると共に、上記第2の圧縮機(2)
のアンロード機構(2a)の負荷状態の上限値をその過電
流検出時での負荷状態値に制限して、圧縮機(1),
(2)の合計容量を減少制御した後、所定時間毎にイン
バータ(15)の出力周波数の上記上限値を上昇させると
共に、該上限値がインバータ(15)の出力可能な最大周
波数になると容量制御手段(50)の両圧縮機(1),
(2)の制限を解除する垂下制御手段(56)と を備えたことを特徴とする冷凍装置の過負荷制御装置。1. A first compressor (1) whose capacity is adjusted by an inverter (15), a second compressor (2) whose capacity is adjusted by an unload mechanism (2a), and both compressors (1). The inverter (15) and the unload mechanism (2a) so as to adjust the total capacity of 1) and 2) in multiple stages.
And a capacity control means (50) for controlling the above, and an overcurrent detection means (55) for detecting a time when an overcurrent flows through the inverter (15) of the first compressor (1); When overcurrent detected by current detection means (55),
The upper limit value of the output frequency of the inverter (15) in the capacity control means (50) is once limited to an output frequency value lower than that when the overcurrent is detected, and the second compressor (2) is also provided.
The upper limit value of the load state of the unload mechanism (2a) is limited to the load state value when the overcurrent is detected, and the compressor (1),
After the total capacity of (2) is controlled to decrease, the upper limit of the output frequency of the inverter (15) is increased every predetermined time, and the capacity control is performed when the upper limit reaches the maximum frequency that the inverter (15) can output. Both compressors (1) of the means (50),
And a drooping control means (56) for releasing the restriction of (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62135563A JPH0814432B2 (en) | 1987-05-29 | 1987-05-29 | Refrigerator overload control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62135563A JPH0814432B2 (en) | 1987-05-29 | 1987-05-29 | Refrigerator overload control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63297783A JPS63297783A (en) | 1988-12-05 |
| JPH0814432B2 true JPH0814432B2 (en) | 1996-02-14 |
Family
ID=15154736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62135563A Expired - Lifetime JPH0814432B2 (en) | 1987-05-29 | 1987-05-29 | Refrigerator overload control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0814432B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100688169B1 (en) * | 2004-12-28 | 2007-03-02 | 엘지전자 주식회사 | Cooling overload operation control method of air conditioner |
| JP5211006B2 (en) * | 2009-10-02 | 2013-06-12 | 日立アプライアンス株式会社 | Refrigeration cycle equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5971967A (en) * | 1982-10-15 | 1984-04-23 | シャープ株式会社 | Air conditioner |
| JPS6092059U (en) * | 1983-11-29 | 1985-06-24 | 東芝空調株式会社 | Refrigeration cycle equipment |
-
1987
- 1987-05-29 JP JP62135563A patent/JPH0814432B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63297783A (en) | 1988-12-05 |
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