JPH0157263B2 - - Google Patents

Info

Publication number
JPH0157263B2
JPH0157263B2 JP58005482A JP548283A JPH0157263B2 JP H0157263 B2 JPH0157263 B2 JP H0157263B2 JP 58005482 A JP58005482 A JP 58005482A JP 548283 A JP548283 A JP 548283A JP H0157263 B2 JPH0157263 B2 JP H0157263B2
Authority
JP
Japan
Prior art keywords
pressure
compressor
rotational speed
speed
rotation speed
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
Application number
JP58005482A
Other languages
Japanese (ja)
Other versions
JPS59131845A (en
Inventor
Tetsuo Sano
Masaya Yamazaki
Yasutoshi Tsucha
Yoshihito Mino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Priority to JP58005482A priority Critical patent/JPS59131845A/en
Publication of JPS59131845A publication Critical patent/JPS59131845A/en
Publication of JPH0157263B2 publication Critical patent/JPH0157263B2/ja
Granted legal-status Critical Current

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
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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

  • Air Conditioning Control Device (AREA)

Description

【発明の詳細な説明】 ［発明の技術分野］ 本発明は、冷凍サイクルを備えた空気調和機に
係り、特にインバータ回路によつて回転数を連続
的に可変可能な圧縮機に対する制御方法の改良に
関する。Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an air conditioner equipped with a refrigeration cycle, and in particular to an improvement in a control method for a compressor whose rotation speed can be continuously varied by an inverter circuit. Regarding.

［発明の技術的背景とその問題点］ インバータ回路によつて圧縮機（コンプレツ
サ）の回転数を制御して冷暖房能力を40〜120％
の範囲で可変できるようにした空気調和機が多用
される傾向にある。これは、必要な冷暖房負荷に
応じた能力で運転することができ、大幅な省エネ
化が実現されるとともに従来のようなON／OFF
制御でなく、連続制御であるため、快適性も向上
する。[Technical background of the invention and its problems] The rotation speed of the compressor is controlled by an inverter circuit to increase the heating and cooling capacity by 40 to 120%.
There is a tendency for air conditioners that can be adjusted within a range to be used more frequently. This system can be operated at a capacity that corresponds to the required heating and cooling load, resulting in significant energy savings and the ability to turn the system on and off as required by conventional systems.
Comfort is also improved because it is not controlled but continuous control.

第１図は、この種空気調和機の電気回路を概略
的に示す。図中１は電源であり、この電源１には
電源ライン２，３が接続される。これら電源ライ
ン２，３には室内ユニツト４内の室内ユニツト制
御回路５が接続される。また、上記電源ライン
２，３には渡り線６，７を介して室外ユニツト８
に備えられた室外ユニツト制御回路９が接続され
るとともにインバータ回路１０が接続される。こ
のインバータ回路１０は、周波数変換機によつて
圧縮機１１の回転数を連続的に可変制御するもの
で、室外ユニツト制御回路９からの制御信号によ
つて制御されるようになつている。なお、上記室
内ユニツト制御回路５には、室温センサ１２と熱
交換器温度センサ１３とが接続され、上記室外ユ
ニツト制御回路９には、検知手段としての圧力セ
ンサ１４と、電流センサ１５とが接続され、それ
ぞれからの検出信号を受入れるようになつてい
る。 FIG. 1 schematically shows the electrical circuit of this type of air conditioner. In the figure, 1 is a power supply, and power supply lines 2 and 3 are connected to this power supply 1. An indoor unit control circuit 5 in an indoor unit 4 is connected to these power supply lines 2 and 3. In addition, an outdoor unit 8 is connected to the power supply lines 2 and 3 via crossover wires 6 and 7.
An inverter circuit 10 is connected to the outdoor unit control circuit 9 provided in the outdoor unit. The inverter circuit 10 continuously varies the rotational speed of the compressor 11 using a frequency converter, and is controlled by a control signal from the outdoor unit control circuit 9. Note that a room temperature sensor 12 and a heat exchanger temperature sensor 13 are connected to the indoor unit control circuit 5, and a pressure sensor 14 and a current sensor 15 as detection means are connected to the outdoor unit control circuit 9. and is adapted to accept detection signals from each.

ところで、たとえば暖房運転時における上記圧
縮機１１の吐出圧力Ｐと回転数ｆとの関係は第２
図に示すようになつている。すなわち、冷凍サイ
クル運転開始とともに回転数ｆが上昇し、これに
ともなつて吐出圧力Ｐが上昇する。吐出圧力Ｐが
最小設定圧P0に到達したところで回転数ｆを最
大回転数f1に保持する。この最大回転数f1に保持
している間においても、冷媒の挙動に起因すると
ころにより、吐出圧力Ｐは必然的に上昇し、最大
設定圧P1に到達する。吐出圧力Ｐは、P1＞Ｐ＞
P0の適正圧力範囲内にあることが望ましいので、
回転数ｆを最大回転数f1から最小回転数f0に下降
する。しかしながら、上述のごとく冷凍サイクル
の圧力応答遅れがあるため、吐出圧力Ｐは最大設
定圧P1を一旦越えて異常高負荷状態となつてか
ら、回転数低下の影響を受けて圧力低下する。こ
の異常負荷状態に対応する第１の設定値である最
大設定圧P1に到達したところで、回転数ｆを最
小回転数f0に保持する。そして吐出圧力Ｐが第２
の設定値である最小設定圧P0に到達したところ
で、再び回転数ｆを最大回転数f1にまで上昇させ
る。しかしながら、冷凍サイクルの圧力変答遅れ
のため、吐出圧力Ｐは最小設定圧P0を一旦越え、
低負荷状態となつてから、圧力上昇する。回転数
ｆの上昇速度と下降速度は一定であるから、以下
このような状態が繰返されることとなる。 By the way, for example, the relationship between the discharge pressure P and the rotation speed f of the compressor 11 during heating operation is the second
It is as shown in the figure. That is, the rotational speed f increases with the start of the refrigeration cycle operation, and the discharge pressure P increases accordingly. When the discharge pressure P reaches the minimum set pressure P0 , the rotational speed f is maintained at the maximum rotational speed f1 . Even while the maximum rotational speed f1 is maintained, the discharge pressure P inevitably increases due to the behavior of the refrigerant and reaches the maximum set pressure P1 . The discharge pressure P is P 1 >P>
It is desirable that the pressure be within the appropriate pressure range of P 0 , so
The rotational speed f is decreased from the maximum rotational speed f1 to the minimum rotational speed f0 . However, as described above, since there is a delay in the pressure response of the refrigeration cycle, the discharge pressure P once exceeds the maximum set pressure P 1 and enters an abnormally high load state, and then decreases under the influence of a decrease in the rotational speed. When the maximum set pressure P1 , which is the first set value corresponding to this abnormal load state, is reached, the rotational speed f is maintained at the minimum rotational speed f0 . Then, the discharge pressure P is the second
When the minimum set pressure P 0 , which is the set value of , is reached, the rotation speed f is increased again to the maximum rotation speed f 1 . However, due to the delay in pressure response in the refrigeration cycle, the discharge pressure P once exceeds the minimum set pressure P0 ,
Pressure increases after reaching low load condition. Since the rising speed and falling speed of the rotational speed f are constant, such a state will be repeated from now on.

したがつて、回転数ｆを頻繁に上昇−下降をさ
せなければならず、圧力の変動も大きいところか
ら、冷凍サイクルが安定しないとともに圧縮機の
耐久性が損われ、さらに電力の無駄が生じるとい
う不具合がある。 Therefore, the rotational speed f must be raised and lowered frequently, and pressure fluctuations are large, making the refrigeration cycle unstable, impairing the durability of the compressor, and wasting electricity. There is a problem.

なお、回転数ｆの上昇−下降速度を一律に遅く
すると、たとえば上記室内ユニツト４の図示しな
い室内送風機の風力切換などによる急激な圧力上
昇が生じたときに追従しきれない場合や、立上り
時間がかかり過ぎるという不具合がある。 Note that if the speed of rise and fall of the rotational speed f is uniformly slowed down, it may not be possible to keep up with a sudden pressure rise caused by switching the indoor fan (not shown) of the indoor unit 4, for example, or the rise time may be slow. There is a problem that it takes too much time.

［発明の目的］ 本発明は、上記事情に着目してなされたもので
あり、その目的とするところは、冷凍サイクルの
変動の少い運転を可能として、快適な空調による
効率向上を図り、圧縮機の耐久性および信頼性の
向上を得る空気調和機の圧縮機制御方法を提供し
ようとするものである。[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to enable operation of the refrigeration cycle with less fluctuation, improve efficiency through comfortable air conditioning, and improve compression. The present invention aims to provide a compressor control method for an air conditioner that improves the durability and reliability of the machine.

［発明の概要］ 本発明は、負荷状態の検知手段が異常高負荷に
対応する第１の設定値を検出したら回転数の変化
速度を大とした下降をなし、第２の設定値以下を
検知したら回転数の変化速度を小とした上昇をな
す制御方法である。[Summary of the Invention] According to the present invention, when the load state detection means detects a first set value corresponding to an abnormally high load, the rotation speed is decreased at a high rate of change, and when the rotation speed is lower than the second set value, it is detected. This is a control method that increases the rotational speed at a small rate of change.

［発明の実施例］ 以下、本発明の一実施例を図面にもとづいて説
明する。第３図に示す空気調和機の電気回路は、
先に第１図に示すものと基本的に同一であるの
で、同一部品には同番号を付して説明を省略す
る。ただし、上記インバータ回路１０に新たに回
転数変化速度切換手段１０ａが備えられることが
相違する。[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings. The electrical circuit of the air conditioner shown in Figure 3 is as follows:
Since it is basically the same as that shown in FIG. 1 above, the same parts are given the same numbers and the explanation will be omitted. However, the difference is that the inverter circuit 10 is newly equipped with a rotational speed change speed switching means 10a.

たとえば、暖房運転時における圧縮機制御方法
は、第３図に示すフローチヤートにしたがつて制
御される。なお、周波数と回転数とは比例関係に
ある。すなわち、まず、ステツプS2で室温と設
定温度にもとづき目標周波数f1が決定される。つ
ぎのステツプS3では周波数変化スピードが大に
設定され、早い周波数上昇がインバータ回路１０
に指示される。これによりインバータ回路１０出
力は急速に上昇する。ステツプS4ではインバー
タ回路１０の出力が目標周波数f1に到達したか否
かが判断される。このステツプでインバータ回路
１０の出力が目標周波数f1に到達していないと判
断された場合、再びステツプS3で周波数の上昇
が指示継続される。この結果、インバータ回路１
０の出力周波数が上昇し、目標周波数f1に到達す
るとステツプS5へと移る。 For example, the compressor control method during heating operation is controlled according to the flowchart shown in FIG. Note that the frequency and the number of rotations are in a proportional relationship. That is, first, in step S2, the target frequency f1 is determined based on the room temperature and the set temperature. In the next step S3, the frequency change speed is set to a high value, so that the inverter circuit 10 can increase the frequency quickly.
be instructed. As a result, the output of the inverter circuit 10 rapidly increases. In step S4, it is determined whether the output of the inverter circuit 10 has reached the target frequency f1 . If it is determined in this step that the output of the inverter circuit 10 has not reached the target frequency f1 , the instruction to increase the frequency is continued again in step S3. As a result, inverter circuit 1
When the output frequency of 0 increases and reaches the target frequency f1 , the process moves to step S5.

ステツプS5では、室外ユニツト制御回路９に
接続された負荷検知器して機能する圧力センサ１
４の出力Ｐが検出される。続くステツプS6では
ステツプS5で検出された圧力センサ１４の出力
Ｐとあらかじめ第２の設定値として設定されてい
る最小設定圧力P0との比較が行われ、Ｐ＞P0の
場合、ステツプS7へと移り、Ｐ≦P0の場合、ス
テツプS11へと移る。 In step S5, the pressure sensor 1 which functions as a load detector is connected to the outdoor unit control circuit 9.
4 outputs P are detected. In the following step S6, the output P of the pressure sensor 14 detected in step S5 is compared with the minimum setting pressure P 0 previously set as the second setting value, and if P>P 0 , the process advances to step S7. If P≦P 0 , the process moves to step S11.

ステツプS7では、圧力センサ４の出力Ｐとあ
らかじめ第１の設定値として設定されている最大
設定圧力P1との比較が行われ、Ｐ＞P1の場合、
ステツプS8へと移り、Ｐ≦P1の場合、ステツプ
S9へと移る。 In step S7, the output P of the pressure sensor 4 is compared with the maximum set pressure P1 , which is set in advance as the first set value, and if P> P1 ,
Move to step S8, and if P≦P 1 , step
Move on to S9.

すなわち、ステツプS6、S7では圧力センサ１
４出力により、冷凍サイクルの圧力がＰ≦P0の
場合ステツプS11に、P0≦Ｐ≦P1の場合ステツプ
S9に、Ｐ＞P1の場合ステツプS8に移行するよう
になつている。 That is, in steps S6 and S7, pressure sensor 1
4 outputs, if the pressure in the refrigeration cycle is P≦P 0 , the process goes to step S11, and if P 0 ≦P≦P 1 , the process goes to step S11.
In S9, if P> P1 , the process moves to step S8.

そこで、まず冷凍サイクルの圧力が適正圧力範
囲以下（Ｐ≦P0）の場合はステツプS11でインバ
ータ回路１０の出力周波数が目標周波数f1に到達
しているか否かが判別され、目標周波数に到達し
ている場合、ステツプS13でこの制御を終了す
る。 Therefore, first, if the pressure of the refrigeration cycle is below the appropriate pressure range (P≦P 0 ), it is determined in step S11 whether the output frequency of the inverter circuit 10 has reached the target frequency f 1 , and the output frequency has reached the target frequency. If so, this control is ended in step S13.

また、ステツプS11の判別で、インバータ回路
１０の出力周波数が目標周波数f1に到達していな
いと判別された場合、ステツプS12に移り、周波
数変化スピードが小に設定され、緩慢な周波数上
昇がインバータ回路１０に指示される。これによ
りインバータ回路１０出力は徐々に上昇する。 Furthermore, if it is determined in step S11 that the output frequency of the inverter circuit 10 has not reached the target frequency f1 , the process moves to step S12, where the frequency change speed is set to a small value and the slow frequency increase is caused by the inverter The circuit 10 is instructed. As a result, the output of the inverter circuit 10 gradually increases.

ステツプS12からは再びステツプS5の圧力Ｐ検
出に戻る。 From step S12, the process returns to step S5 to detect the pressure P.

したがつて、冷凍サイクルの圧力が適正圧力範
囲以下（Ｐ≦P0）に保持されている間はインバ
ータ回路１２の出力周波数が目標周波数f1に到達
するまで緩慢な周波数上昇がインバータ回路１０
に指示され、インバータ回路１０に指示され、イ
ンバータ回路１０出力は徐々に上昇する。 Therefore, while the pressure of the refrigeration cycle is maintained below the appropriate pressure range (P≦P 0 ), the frequency of the inverter circuit 10 increases slowly until the output frequency of the inverter circuit 12 reaches the target frequency f 1 .
, the inverter circuit 10 is instructed, and the output of the inverter circuit 10 gradually increases.

一方、冷凍サイクルの圧力が適正圧力（P0≦
Ｐ≦P1）にある場合ステツプS9で周波数の変更
は禁止され、圧力検出のステツプS5へ戻る。 On the other hand, the pressure of the refrigeration cycle is the appropriate pressure (P 0 ≦
If P≦P 1 ), the frequency change is prohibited in step S9, and the process returns to pressure detection step S5.

このため、ステツプS5での検出圧力に変化が
なければ、インバータ回路１０の出力周波数はそ
のままの状態で保持される。 Therefore, if there is no change in the detected pressure at step S5, the output frequency of the inverter circuit 10 is maintained as it is.

また、冷凍サイクルの圧力が適正圧力範囲を越
えて上昇した（Ｐ＞P1）場合、ステツプS8でイ
ンバータ回路１０の出力周波数が最小周波数f0に
なつているか否かが判別され、最小周波数f0であ
ればそのままの状態を保持し、最小周波数f0でな
ければステツプS10で周波数変化速度が大に設定
され、急速な周波数下降がインバータ回路１０に
指示される。これによりインバータ回路１０出力
は急速に低下すると同時に冷凍サイクルの圧力も
急速に低下する。 Furthermore, if the pressure of the refrigeration cycle rises beyond the appropriate pressure range (P>P 1 ), it is determined in step S8 whether the output frequency of the inverter circuit 10 has reached the minimum frequency f 0 , and the minimum frequency f If it is 0 , the state is maintained as it is, and if the minimum frequency f is not 0, the frequency change speed is set to a large value in step S10, and the inverter circuit 10 is instructed to rapidly lower the frequency. As a result, the output of the inverter circuit 10 rapidly decreases, and at the same time, the pressure of the refrigeration cycle also decreases rapidly.

そして、再びステツプS5での圧力検出に戻り、
再度冷凍サイクルの圧力状態の判別がステツプ
S6、７で行われる。 Then, return to pressure detection in step S5 again.
The next step is to determine the pressure status of the refrigeration cycle again.
This will take place in S6 and 7.

この制御フローチヤートにもとづく制御例を第
５図により説明する。すなわち、冷凍サイクル運
転開始とともに回転数ｆが上昇し、これにともな
い吐出圧力Ｐが上昇する。このとき、被空調室の
室温と設定温度との差により回転数を制御する
が、運転開始時は温度差が大であり、早急に設定
温度に到達させるため、回転数ｆの上昇変化速度
を大とする。吐出圧力Ｐが最小設定圧P0に到達
したところで、回転数ｆが最大回転数f1になり、
その状態に保持する。この間に吐出圧力Ｐは上昇
し、適正圧力範囲での運転がなされる。吐出圧力
Ｐが上昇して第１の設定値である最大設定圧P1
を越えたことを圧力センサ１４が検知すると、こ
れは室外ユニツト制御回路９に検知信号を送り、
インバータ回路１０から圧縮機１１へ回転数下降
の信号が送られる。回転数ｆの下降変化速度は大
の状態で下降する。吐出圧力Ｐは冷凍サイクルの
圧力応答遅れがあるため、一旦最大設定圧P1を
越えて異常高負荷状態となるが、回転数ｆの下降
変化速度が大であるため、上記状態は早急に解消
して圧力低下する。吐出圧力Ｐが元の最大設定圧
P1に到達したところで回転数ｆも最大回転数f0ま
で下降するので、この状態を保持する。この間に
吐出圧力Ｐが下降して適正圧力範囲で運転がなさ
れる。圧縮機１１が最大回転数を保持しているの
で、吐出圧力Ｐは下降を継続し第２の設定値であ
る最小設定圧P0を越える。圧力センサ１４はこ
れを検知して回転数ｆの上昇の指示をする。一旦
異常高負荷状態を越えた後なので、回転数ｆの上
昇変化速度を極めて遅くする。すなわち、同図に
おけるＡ点から回転数ｆの速度変化勾配は緩くな
る。これにともない吐出圧力Ｐの上昇も極めて緩
慢化し、回転数ｆが適正回転数f2に上昇したとこ
ろで最小設定圧P0に到達する。再び圧力センサ
１４の検知信号を受けて、インバータ回路１０は
この回転数f2を保持するよう指示する。したがつ
て、吐出圧力Ｐは最小設定圧P0と最大設定圧P1
との間の適正圧力範囲内に極めて長い時間留り、
設定温度に近い暖房運転を得る。そして、時間の
経過とともに徐々に圧力上昇し、ついには最大設
定圧P1に到達することを検知される。回転数ｆ
は直ちに最小回転数f0まで下降する。このときの
変化速度は大でよく、図における速度勾配は急と
なる。吐出圧力Ｐは極めて短時間で異常高負荷状
態を脱し、再び適正圧力範囲に入る。最小回転数
f0をそのまま継続すれば、吐出圧力Ｐも極めて長
時間、適正圧力範囲内にあり、かつ徐々に圧力低
下する。最小設定圧P0まで低下したことを検知
したら、最小回転数f0から適正回転数f2まで上昇
させる。このときの変化速度は小である。すなわ
ち、運転開始時に異常高負荷状態となるが、この
状態の直後の回転数切換点Ａに戻る。以後、回転
数ｆの変化速度を同一のパターンで繰返すことに
より、吐出圧力Ｐを適正圧力範囲内に保持でき、
異常高負荷状態となる回数およびその時間を最小
限に押え得る。 An example of control based on this control flowchart will be explained with reference to FIG. That is, the rotational speed f increases with the start of the refrigeration cycle operation, and the discharge pressure P increases accordingly. At this time, the rotation speed is controlled based on the difference between the room temperature of the air-conditioned room and the set temperature, but since the temperature difference is large at the start of operation, in order to quickly reach the set temperature, the rate of increase in the rotation speed f is controlled. Make it large. When the discharge pressure P reaches the minimum setting pressure P 0 , the rotation speed f becomes the maximum rotation speed f 1 ,
Hold it in that state. During this time, the discharge pressure P increases, and operation is performed within an appropriate pressure range. The discharge pressure P increases to the first set value, the maximum set pressure P 1
When the pressure sensor 14 detects that the pressure exceeds the limit, it sends a detection signal to the outdoor unit control circuit 9.
A signal to lower the rotational speed is sent from the inverter circuit 10 to the compressor 11. The rotational speed f decreases at a high rate. Due to the pressure response delay in the refrigeration cycle, the discharge pressure P temporarily exceeds the maximum set pressure P1 , resulting in an abnormally high load condition, but the above condition is quickly resolved because the rate of decline in the rotational speed f is large. and the pressure will drop. Discharge pressure P is the original maximum setting pressure
When reaching P1 , the rotational speed f also decreases to the maximum rotational speed f0 , so this state is maintained. During this time, the discharge pressure P decreases, and operation is performed within the appropriate pressure range. Since the compressor 11 maintains the maximum rotational speed, the discharge pressure P continues to decrease and exceeds the second set value, the minimum set pressure P 0 . The pressure sensor 14 detects this and issues an instruction to increase the rotational speed f. Since this is after the abnormally high load condition has been exceeded, the rate of increase in the rotational speed f is made extremely slow. That is, the speed change gradient of the rotational speed f becomes gentler from point A in the figure. Along with this, the rise in the discharge pressure P also becomes extremely slow, and when the rotational speed f increases to the appropriate rotational speed f2 , the minimum set pressure P0 is reached. Upon receiving the detection signal from the pressure sensor 14 again, the inverter circuit 10 instructs to maintain this rotational speed f2 . Therefore, the discharge pressure P is the minimum setting pressure P 0 and the maximum setting pressure P 1
stays within the proper pressure range between
Obtain heating operation close to the set temperature. Then, it is detected that the pressure gradually increases over time and finally reaches the maximum set pressure P1 . Rotation speed f
immediately decreases to the minimum rotational speed f 0 . The rate of change at this time may be large, and the velocity gradient in the figure becomes steep. The discharge pressure P escapes from the abnormally high load state in a very short time and returns to the appropriate pressure range. Minimum rotation speed
If f 0 continues as it is, the discharge pressure P will remain within the appropriate pressure range for a very long time, and the pressure will gradually decrease. When it is detected that the minimum setting pressure P 0 has been lowered, the minimum rotation speed f 0 is increased to the appropriate rotation speed f 2 . The rate of change at this time is small. That is, although an abnormally high load condition occurs at the start of operation, the engine speed returns to the rotation speed switching point A immediately after this condition. Thereafter, by repeating the rate of change of the rotational speed f in the same pattern, the discharge pressure P can be maintained within the appropriate pressure range,
The number of times and duration of abnormally high load conditions can be minimized.

なお、上記実施例においては、特に圧力センサ
１４の吐出圧力Ｐ検出にもとづいて圧縮機１１の
回転数を制御するようにしたが、これに限定され
るものではなく、圧縮機１１の入力側電流検知、
各熱交換器の温度検知、吸込圧力検知などによ
り、負荷状態を検出して圧縮機１１の回転数を制
御するようにしてもよい。 In the above embodiment, the rotation speed of the compressor 11 is controlled based on the detection of the discharge pressure P by the pressure sensor 14, but the number of rotations of the compressor 11 is not limited to this, and the input side current of the compressor 11 is controlled. detection,
The rotation speed of the compressor 11 may be controlled by detecting the load condition by detecting the temperature of each heat exchanger, detecting the suction pressure, or the like.

また、１台の圧縮機に複数台の室内熱交換器を
連通する、いわゆるマルチタイプの空気調和機に
おいては、単体のものより負荷変動が激しいの
で、上記実施例のごとき制御を行うと効果的であ
る。 In addition, in so-called multi-type air conditioners in which multiple indoor heat exchangers are connected to one compressor, the load fluctuations are more severe than in a single compressor, so it is effective to perform control as in the above example. It is.

［発明の効果］ 本発明は、圧縮機の変化速度を大とした回転数
下降と、変化速度を小とした回転数上昇をなす制
御方法であるから、従来よりも回転数変動回数が
少くなり、冷凍サイクルが安定して効率の向上
と、空調の快適性向上化を得る。さらに異常高負
荷状態が減少し、圧縮機の耐久性および信頼性の
向上化を得るなどの効果を奏する。[Effects of the Invention] The present invention is a control method that lowers the rotation speed of the compressor with a large change rate and increases the rotation speed with a small change rate, so the number of rotation speed fluctuations is reduced compared to the conventional method. , the refrigeration cycle is stabilized, efficiency is improved, and air conditioning comfort is improved. Further, abnormally high load conditions are reduced, and the durability and reliability of the compressor are improved.

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

第１図は本発明の従来例を示す空気調和機の概
略的電気回路図、第２図はその圧縮機制御方法を
説明する特性図、第３図は本発明の一実施例を示
す空気調和機の概略的電気回路図、第４図はその
圧縮機制御方法を説明するフローチヤート図、第
５図はその制御方法を説明する特性図である。 １１……圧縮機、１４……圧力センサ、１０…
…インバータ回路、１０ａ……回転数変化速度切
換手段。 Fig. 1 is a schematic electrical circuit diagram of an air conditioner showing a conventional example of the present invention, Fig. 2 is a characteristic diagram explaining a compressor control method thereof, and Fig. 3 is an air conditioner showing an embodiment of the present invention. FIG. 4 is a flowchart illustrating the compressor control method, and FIG. 5 is a characteristic diagram illustrating the control method. 11...Compressor, 14...Pressure sensor, 10...
...Inverter circuit, 10a...Rotational speed change speed switching means.

Claims (1)

【特許請求の範囲】[Claims] １ 回転数が可変可能な圧縮機を備えて冷凍サイ
クルを構成するとともに、負荷状態の検知手段を
有し、この検知手段の検出した負荷が異常高負荷
に対応する第１の設定値を越えた場合、前記圧縮
機の回転数を下降して負荷を低下させ、その後、
前記検知手段の検出した負荷が低下して第２の設
定値よりも低下したことが検出された場合、前記
圧縮機の回転数を上昇させる空気調和機の圧縮機
制御方法において、検知手段の検出した負荷が第
１の設定値を越えた場合、変化速度を大として前
記圧縮機の回転数を下降させ、その後、前記検知
手段の検出した負荷が第２の設定値よりも低下し
たことが検出された場合、変化速度を小として前
記圧縮機の回転数を上昇させることを特徴とする
空気調和機の圧縮機制御方法。1 A refrigeration cycle is configured with a compressor whose rotation speed is variable, and has a load state detection means, and when the load detected by this detection means exceeds a first set value corresponding to an abnormally high load. In this case, the rotation speed of the compressor is lowered to reduce the load, and then,
In the compressor control method for an air conditioner, the method for controlling a compressor of an air conditioner increases the rotation speed of the compressor when it is detected that the load detected by the detection means has decreased to be lower than a second set value. If the load exceeds a first set value, the speed of change is increased to decrease the rotation speed of the compressor, and thereafter, it is detected that the load detected by the detection means has decreased below a second set value. If the rotational speed of the compressor is increased, the speed of change is reduced and the rotational speed of the compressor is increased.
JP58005482A 1983-01-17 1983-01-17 Control method of compressor in air conditioner Granted JPS59131845A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58005482A JPS59131845A (en) 1983-01-17 1983-01-17 Control method of compressor in air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58005482A JPS59131845A (en) 1983-01-17 1983-01-17 Control method of compressor in air conditioner

Publications (2)

Publication Number Publication Date
JPS59131845A JPS59131845A (en) 1984-07-28
JPH0157263B2 true JPH0157263B2 (en) 1989-12-05

Family

ID=11612458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58005482A Granted JPS59131845A (en) 1983-01-17 1983-01-17 Control method of compressor in air conditioner

Country Status (1)

Country Link
JP (1) JPS59131845A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282712A (en) * 1985-05-13 1994-02-01 Computer Aided Systems, Inc. Organizer system and method for a rotatable storage structure
JPS63140253A (en) * 1986-12-03 1988-06-11 株式会社日立製作所 Air conditioner
JPH0769071B2 (en) * 1987-11-19 1995-07-26 松下電器産業株式会社 Air conditioner frequency controller
JPH01193562A (en) * 1988-01-29 1989-08-03 Toshiba Corp Air conditioner
FR2895787B1 (en) * 2006-01-04 2013-04-26 Valeo Systemes Thermiques AIR CONDITIONING SYSTEM HAVING A SUPERCRITICAL FLUID
US9997262B2 (en) 2013-12-26 2018-06-12 Nuscale Power, Llc Integral reactor pressure vessel tube sheet
US10685752B2 (en) 2015-02-10 2020-06-16 Nuscale Power, Llc Steam generator with inclined tube sheet

Also Published As

Publication number Publication date
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