JPH03207963A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH03207963A JPH03207963A JP2000920A JP92090A JPH03207963A JP H03207963 A JPH03207963 A JP H03207963A JP 2000920 A JP2000920 A JP 2000920A JP 92090 A JP92090 A JP 92090A JP H03207963 A JPH03207963 A JP H03207963A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- compressor
- current value
- current
- lowest
- 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
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 8
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 238000004904 shortening Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010726 refrigerant oil Substances 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
- 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)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、運転制御装置にマイクロコンピュータを用い
た空気調和機に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner using a microcomputer as an operation control device.
（従来の技ｖ＃）
一般に、空気調和機は，第３図に示したように圧縮機工
、室外側熱交換器２、減圧器３，室内側熱交換器４が順
次連結されて、冷凍サイクルが構威されている。そして
、圧縮機上の電流値が高くなると，冷媒の吐出圧力も高
くなる。一方、近年は、建物における断熱仕様の高度化
による冷房負荷の減少，若しくは小さい冷房能力での長
時間運転で部屋を保冷しておく必要から、圧縮機ｌを低
い周波数で運転する頻度が高くなっている。(Conventional Technique v#) Generally, in an air conditioner, as shown in Fig. 3, a compressor, an outdoor heat exchanger 2, a pressure reducer 3, and an indoor heat exchanger 4 are sequentially connected to form a refrigeration cycle. is being organized. As the current value on the compressor increases, the refrigerant discharge pressure also increases. On the other hand, in recent years, the frequency of compressor operation at lower frequencies has increased due to the reduction in cooling loads due to the advancement of insulation specifications in buildings, or the need to keep rooms cool by operating for long periods of time with low cooling capacity. ing.
（発明が解決しようとする課題）
ところが、上記のように、圧縮機を低い周波数で運転中
に、電流値が高くなると、冷媒の吐出圧力が高くなって
，圧縮機内部での冷凍油の潤滑不良等によりロック現象
が発生し、寿命が短くなるという問題があった，
本発明は，上記問題点を解決するもので、空気調和機の
冷房運転時に、圧縮機の電流値及び運転周波数を検出し
、所定の条件を満たしたときは圧縮機の運転周波数を予
め定めた最低周波数に設定し、冷房運転時でかつ低い周
波数での運転時における圧縮機の吐出圧力の異常上昇を
防止するようにした空気調和機を提供することを目的と
する。(Problem to be Solved by the Invention) However, as described above, when the current value increases while the compressor is operating at a low frequency, the refrigerant discharge pressure increases, causing the refrigerant oil inside the compressor to lubricate. The present invention solves the above problems and detects the current value and operating frequency of the compressor during cooling operation of the air conditioner. However, when certain conditions are met, the operating frequency of the compressor is set to the predetermined minimum frequency to prevent an abnormal increase in the compressor discharge pressure during cooling operation and operation at a low frequency. The purpose is to provide an air conditioner with
（Ｒ題を解決するための手段）
上記問題点を解決するために，本発明は、圧縮機，室外
側熱交換器、室外側ファン、減圧器、室内側熱交換器、
室内側ファンを具備した空気調和機において、圧縮機の
電流値を検出する電流検出器と、予め設定された電流値
を記憶している設定電流記憶手段と，検出された電流値
と設定電流値とを比較して検出された電流値が設定電流
値以上であるとき信号を出力する第１の比較手段と５こ
の第１の比較手段からの出力信号により、予め設定され
た圧縮機の最低周波数を出力する最低周波数設定手段と
、圧縮機の運転周波数を検出する周波数検出手段と、検
出された運転周波数と最低周波数とを比較して検出され
た運転周波数が最低周波数以下であるとき信号を出力す
る第２の比較手段と、この第２の比較手段からの出力信
号により，圧縮機の運転周波数を最低周波数に設定する
周波数設定手段とを備えた構或とするものである。(Means for Solving Problem R) In order to solve the above problems, the present invention provides a compressor, an outdoor heat exchanger, an outdoor fan, a pressure reducer, an indoor heat exchanger,
In an air conditioner equipped with an indoor fan, a current detector detects a current value of a compressor, a set current storage means that stores a preset current value, and a detected current value and a set current value. a first comparison means that outputs a signal when the detected current value is equal to or higher than the set current value; A minimum frequency setting means for outputting the operating frequency of the compressor, a frequency detection means for detecting the operating frequency of the compressor, and a signal is output when the detected operating frequency is compared with the minimum frequency and the detected operating frequency is below the minimum frequency. The compressor is configured to include a second comparing means for determining the operating frequency of the compressor to a minimum frequency based on an output signal from the second comparing means.
（作 用）
この構或により、空気調和機の冷房運転時において、圧
縮機の運転電流、運転周波数を検知しながら運転を継続
し、ある電流値以上では，圧縮機の運転周波数がある値
以下にならないように制御し，従って、圧縮機の吐出圧
力をある値以下に抑えて圧縮機のロック発生、若しくは
寿命の低下を防止する。(Function) With this structure, during cooling operation of the air conditioner, the operation continues while detecting the operating current and operating frequency of the compressor, and when the current value exceeds a certain value, the operating frequency of the compressor drops below a certain value. Therefore, the discharge pressure of the compressor is kept below a certain value to prevent the compressor from locking up or shortening its life.
（実施例） 以下図面を参照して実施例を詳細に説明する。(Example) Embodiments will be described in detail below with reference to the drawings.
第３図は，本発明の一実施例の空気調和機の冷凍サイク
ル系統図である。第３図において，１は圧縮機、２は室
外側熱交換器，３は減圧器、４は室？側熱交換器、５は
室外側ファン、６は室内側ファンで，これらにより冷凍
サイクルが構威されている。７は圧縮機１の運転周波数
を変更できる駆動回路で、パワートランジスタからなる
。８は圧縮機駆動回路７の電源回路である。９は電流検
出器で、圧縮機１の運転電流値を検出する． １０は制
御回路で，電流検出器９で検出された電流値ビと設定電
流値Ｚ■、圧縮機運転周波数ｆと設定周波数／ｏとをそ
れぞれ比較し，電流値ｔが設定電流値ビ０以上で、かつ
圧縮機運転周波数ｆが設定周波数／ｏ以下の場合に，圧
縮機の運転周波数をｉｏに設定する。FIG. 3 is a refrigeration cycle system diagram of an air conditioner according to an embodiment of the present invention. In Fig. 3, 1 is a compressor, 2 is an outdoor heat exchanger, 3 is a pressure reducer, and 4 is a chamber? A side heat exchanger, 5 is an outdoor fan, and 6 is an indoor fan, these constitute a refrigeration cycle. Reference numeral 7 denotes a drive circuit that can change the operating frequency of the compressor 1, and is composed of a power transistor. 8 is a power supply circuit for the compressor drive circuit 7. 9 is a current detector that detects the operating current value of the compressor 1. 10 is a control circuit that compares the current value Bi detected by the current detector 9 with the set current value Z■, the compressor operating frequency f and the set frequency /o, and determines that the current value t is equal to or higher than the set current value Bi0. and when the compressor operating frequency f is equal to or less than the set frequency/o, the compressor operating frequency is set to io.
第１図は，本実施例の要部のブロック図であり，第２＠
は、その動作を示すフローチャートである．第１図にお
いて、制御回路１０は、予め設定された電流値ｔＯを記
憶している設定電流記憶手段１１と，電流検出器９で検
出された電流値Ｚと設定電流記憶手段１１に設定された
設定電流値ＺＯとを比較する第１の比較手段１２と、予
め圧縮機１の最低周波数！。が設定され、第１の比較手
段１２がらの出力信号により最低周波数／ｏを出力する
最低周波数設定手段ｌ３と、圧縮機上の運転周波数ｆを
検出する周波数検出手段ｌ４と，検出された運転周波数
ｆと最低周波数ｆｏとを比較して検出された運転周波数
ｆが最低周波数／ｏ以下であるとき信号を出力する第２
の比較手段１５と、この第２の比較手段ｌ５からの出力
信号により、圧縮機１の運転周波数を最低周波数ｆ０に
設定する周波数設定手段１６とを備えている。Figure 1 is a block diagram of the main parts of this embodiment, and Figure 2
is a flowchart showing the operation. In FIG. 1, a control circuit 10 includes a set current storage means 11 that stores a preset current value tO, and a current value Z detected by a current detector 9 and a set current stored in the set current storage means 11. The first comparison means 12 for comparing the set current value ZO and the lowest frequency of the compressor 1 in advance! . is set, the lowest frequency setting means l3 outputs the lowest frequency /o by the output signal of the first comparison means 12, the frequency detecting means l4 detects the operating frequency f on the compressor, and the detected operating frequency A second device that compares f and the lowest frequency fo and outputs a signal when the detected operating frequency f is equal to or lower than the lowest frequency/o.
and a frequency setting means 16 for setting the operating frequency of the compressor 1 to the lowest frequency f0 based on the output signal from the second comparison means 15.
上記構或による動作を第２図を用いて説明する．冷房運
転開始と共に、電流検出器９により電流値ｔが読み込ま
れ、設定電流記憶手段１１に設定された設定電流値ｉ０
と第１の比較手段ｌ２で比較され、ｔ≧４′ｏであると
きに、最低周波数設定手段１３から最低周波数ＩＯが出
力される。一方、周波数検出手段１４により圧縮機工の
運転周波数ｆが読み込まれ、最低周波数／ｏと運転周波
数ｆとが第２の比較手段１５で比較され、ｆ≦／ｏであ
るときに、周波数設定手段１６により運転周波数ｆを最
低周波数ｉｏに切り換えて圧縮機上を駆動する。従って
、第３図において、高い電流値かつ低い運転周波数条件
で圧縮機工を駆動して吐出圧力が高い状態になることを
防止でき、その結果、圧縮機１のロックの発生、若しく
は寿命の低下を防止することができる。The operation of the above structure will be explained using Fig. 2. When the cooling operation starts, the current value t is read by the current detector 9, and the set current value i0 is set in the set current storage means 11.
is compared by the first comparing means l2, and when t≧4'o, the lowest frequency setting means 13 outputs the lowest frequency IO. On the other hand, the operating frequency f of the compressor is read by the frequency detecting means 14, the lowest frequency /o and the operating frequency f are compared by the second comparing means 15, and when f≦/o, the frequency setting means 16 The operating frequency f is switched to the lowest frequency io to drive the compressor. Therefore, as shown in FIG. 3, it is possible to prevent the discharge pressure from becoming high when the compressor is driven under conditions of high current value and low operating frequency, and as a result, locking of the compressor 1 or shortening of its life can be prevented. It can be prevented.
（発明の効果）
以上説明したように、本発明によれば，圧縮機の電流値
及び運転周波数を検出しながら運転を継続し，圧縮機の
低い周波数での運転時に吐出圧力が上昇しないように運
転周波数を変化させるので、簡単な構成で圧縮機のロッ
クの発生若しくは寿命の低下を防止することができる効
果を有する。(Effects of the Invention) As explained above, according to the present invention, operation is continued while detecting the current value and operating frequency of the compressor, and the discharge pressure is prevented from increasing when the compressor is operated at a low frequency. Since the operating frequency is changed, it is possible to prevent the compressor from locking up or shortening its life with a simple configuration.
第工図は、本発明の一実施例の空気調和機の要部ブロッ
ク図、第２図は、同動作を示すフローチャート、第３図
は、同空気調和機の冷凍サイクル系統図である。
１ ・・・圧縮機、 ２・・・室外側熱交換器、３ ・
・・減圧器、 ４ ・・・室内側熱交換器、５ ・・・
室外側ファン、 ６ ・・・室内側ファン、７・・・圧
縮機駆動回路、 ９ ・・・電流検出器，ＩＯ・・・制
御回路、１１ ・・設定電流記憶手段，１２・・・第
工の比較手段、ｌ３・・・最低周波数設定手段． １
４・・・周波数検出手段，ｌ５・・・第２の比較手段、
１６・・・周波数設定手段。Fig. 2 is a block diagram of essential parts of an air conditioner according to an embodiment of the present invention, Fig. 2 is a flowchart showing the same operation, and Fig. 3 is a refrigeration cycle system diagram of the air conditioner. 1...Compressor, 2...Outdoor heat exchanger, 3.
...Pressure reducer, 4 ...Indoor heat exchanger, 5 ...
Outdoor fan, 6...Indoor fan, 7...Compressor drive circuit, 9...Current detector, IO...Control circuit, 11...Setting current storage means, 12...No. l3 . . . lowest frequency setting means. 1
4... Frequency detection means, l5... Second comparison means,
16...Frequency setting means.
Claims (1)
側熱交換器、室内側ファンを具備した空気調和機におい
て、 前記圧縮機の電流値ｉを検出する電流検出器と、予め設
定された電流値ｉ＿ｏを記憶している設定電流記憶手段
と、検出された電流値ｉと設定電流値ｉ＿ｏとを比較し
て検出された電流値が設定電流値以上であるとき信号を
出力する第１の比較手段と、この第１の比較手段からの
出力信号により、予め設定された圧縮機の最低周波数ｆ
＿ｏを出力する最低周波数設定手段と、前記圧縮機の運
転周波数ｆを検出する周波数検出手段と、検出された運
転周波数ｆと前記最低周波数ｆ＿ｏとを比較して検出さ
れた運転周波数が前記最低周波数以下であるとき信号を
出力する第２の比較手段と、この第２の比較手段からの
出力信号により、前記圧縮機の運転周波数を前記最低周
波数ｆ＿ｏに設定する周波数設定手段とを備えたことを
特徴とする空気調和機。[Scope of Claims] An air conditioner including a compressor, an outdoor heat exchanger, an outdoor fan, a pressure reducer, an indoor heat exchanger, and an indoor fan, comprising: a current for detecting a current value i of the compressor; A detector and a set current storage means that stores a preset current value i_o compare the detected current value i and the set current value i_o, and the detected current value is greater than or equal to the set current value. a first comparison means that outputs a signal when a preset minimum frequency f of the compressor is determined by the output signal from the first comparison means.
a minimum frequency setting means for outputting _o; a frequency detection means for detecting the operating frequency f of the compressor; and frequency setting means for setting the operating frequency of the compressor to the lowest frequency f_o based on the output signal from the second comparing means. Air conditioner with special features.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000920A JPH03207963A (en) | 1990-01-09 | 1990-01-09 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000920A JPH03207963A (en) | 1990-01-09 | 1990-01-09 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03207963A true JPH03207963A (en) | 1991-09-11 |
Family
ID=11487123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000920A Pending JPH03207963A (en) | 1990-01-09 | 1990-01-09 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03207963A (en) |
-
1990
- 1990-01-09 JP JP2000920A patent/JPH03207963A/en active Pending
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