JPH03207962A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH03207962A JPH03207962A JP2000922A JP92290A JPH03207962A JP H03207962 A JPH03207962 A JP H03207962A JP 2000922 A JP2000922 A JP 2000922A JP 92290 A JP92290 A JP 92290A JP H03207962 A JPH03207962 A JP H03207962A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- compressor
- temperature
- heat exchanger
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 8
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005461 lubrication Methods 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
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.
（従来の技術）
一般に、空気調和機は、第３図に示したように圧縮機１
，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、冷凍サイクルが構成されている。そして
、室外側熱交換器２の温度が高くなると、圧縮機１の冷
媒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１を低い周波数で運転する頻度が高くなってい
る．
（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，室外側熱交換器２の温度が高くなると、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。(Prior art) Generally, an air conditioner has a compressor 1 as shown in FIG.
, an outdoor heat exchanger 2, a pressure reducer 3, and an indoor heat exchanger 4 are successively connected to form a refrigeration cycle. When the temperature of the outdoor heat exchanger 2 increases, the refrigerant discharge pressure of the compressor 1 also increases. On the other hand, in recent years, the frequency of operating the compressor 1 at a lower frequency 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 with low cooling capacity. ing. (Problem to be Solved by the Invention) However, as described above, when the temperature of the outdoor heat exchanger 2 increases while the compressor is operating at a low frequency, the discharge pressure of the refrigerant increases and the inside of the compressor increases. There was a problem that a locking phenomenon occurred due to insufficient lubrication of refrigerating oil, etc., and the life span was shortened.
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、室外側熱交換器の中央部付近の温度及び
圧縮機の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，
（課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、室外側熱
交換器の中央部付近に設けられその熱交換器の温度を検
出する熱交換器温度検出器と、予め設定された温度を記
憶している設定温度記憶手段と，検出された温度と設定
温度とを比較して検出された温度が設定温度以上である
とき信号を出力する第１の比較手段と、この第ｌ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
低周波数を出方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の比較手段がらの出方信号により、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
段とを備えた構成とするものである。The present invention solves the above-mentioned problems by detecting the temperature near the center of the outdoor heat exchanger and the operating frequency of the compressor during the cooling operation of the air conditioner, and when predetermined conditions are met. The purpose of the present invention is to provide an air conditioner in which the operating frequency of the compressor is set to a predetermined minimum frequency to prevent an abnormal increase in the discharge pressure of the compressor during cooling operation and operation at a low frequency. (Means for Solving the Problems) 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 heat exchanger temperature detector is installed near the center of an outdoor heat exchanger to detect the temperature of the heat exchanger, and a preset temperature is stored. a set temperature storage means; a first comparison means that compares the detected temperature with the set temperature and outputs a signal when the detected temperature is equal to or higher than the set temperature; and an output signal from the first comparison means. The lowest frequency setting means outputs a preset lowest frequency of the compressor, the frequency detecting means detects the operating frequency of the compressor, and the detected operating frequency is compared with the lowest frequency. A second comparison means outputs a signal when the operating frequency is below the minimum frequency, and a frequency setting means sets the operating frequency of the compressor to the minimum frequency based on the output signal from the second comparison means. It is designed to have a simple configuration.
（作 用）
この構成により，空気調和機の冷房運転時において、室
外側熱交換器の温度及び圧縮機の運転周波数を検知しな
がら運転を継続し、ある熱交換器温度以上では、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 configuration, during cooling operation of the air conditioner, the operation continues while detecting the temperature of the outdoor heat exchanger and the operating frequency of the compressor. The operating frequency is controlled so that it does not fall below a certain value, and therefore the discharge pressure of the compressor is suppressed 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は室内側熱交換器、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
サイクルが構成されている。７は圧縮機ｔ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は室外側
熱交換器２の中央部付近に設けられた熱交換器温度検出
器である。１０は制御回路で、熱交換器温度検出［１９
で検出された温度ｔと設定温度ｔｏ．圧縮機運転周波数
ｆと設定周波数ｆｏとをそれぞれ比較し、検出された温
度ｔが設定温度ｔｏ以上で，かつ圧縮機運転周波数ｆが
股定周波数ｔｏ以下の場合に、圧縮機の運転周波数をｆ
ｏ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, 4 is an indoor heat exchanger, 5 is an outdoor fan, and 6 is an indoor fan, which constitute a refrigeration cycle. has been done. 7 is a drive circuit that can change the operating frequency of the compressor t, and is composed of a power transistor. 8 is a power supply circuit for the compressor drive circuit 7. 9 is a heat exchanger temperature detector provided near the center of the outdoor heat exchanger 2. 10 is a control circuit that detects the heat exchanger temperature [19
The detected temperature t and the set temperature to. The compressor operating frequency f and the set frequency fo are compared, and if the detected temperature t is higher than the set temperature to and the compressor operating frequency f is lower than the specified frequency to, the compressor operating frequency is set to f.
Set to o.
第１図は、本実施例の要部のブロック図であり，第２図
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、予め設定された温度ｔｏを記憶
している設定温度記憶手段１１と，熱交換器温度検出器
９で検出された温度ｔと設定温度記憶手段Ｕに設定され
た設定温度ｔｏ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ｆｏが設定され、第ｌの比較手
段１２からの出力信号により最低周波数ｆｏを出力する
最低周波数設定手段１３と、圧縮機１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ｆｏ以下であるとき信号を出力する第２
の比較手段ｌ５と、この第２の比較手段１５からの出力
信号により，圧縮機工の運転周波数を最低周波数ｆｏに
設定する周波数設定手段ｌ６とを備えている。FIG. 1 is a block diagram of the main parts of this embodiment, and FIG. 2 is a flowchart showing its operation. In FIG. 1, the control circuit 10 includes a set temperature storage means 11 that stores a preset temperature to, a temperature t detected by a heat exchanger temperature detector 9, and a set temperature storage means U. a first comparing means 12 that compares the set temperature to with a set temperature to; and a lowest frequency setting means 13, in which the lowest frequency fo of the compressor 1 is set in advance and outputs the lowest frequency fo according to the output signal from the first comparing means 12. and a frequency detection means l4 for detecting the operating frequency f of the compressor 1, which compares the detected operating frequency 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 fo. Second to do
and a frequency setting means 16 for setting the operating frequency of the compressor to the lowest frequency fo based on the output signal from the second comparison means 15.
上記構威による動作を第２図を用いて説明する。The operation of the above structure will be explained using FIG. 2.
冷房運転開始と共に、熱交換器温度検出器９により温度
ｔが読み込まれ，設定温度記憶手段１１に設定された設
定温度ｔｏと第１の比較手段１２で比較され、ｔ≧ｔｏ
であるときに、最低周波数設定手段１３から最低周波数
ｆｏが出力される。一方、周波数検出手段ｌ４により圧
縮機１の運転周波数ｆが読み込まれ、最低周波数ｆｏと
運転周波数ｆとが第２の比較手段ｌ５で比較され，ｆ≦
ｆ０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ｆｏに切り換えて圧縮機１を駆動する
。When the cooling operation starts, the temperature t is read by the heat exchanger temperature detector 9, and is compared with the set temperature to set in the set temperature storage means 11 by the first comparison means 12, and the temperature t is compared with the set temperature to set in the set temperature storage means 11.
When , the lowest frequency fo is output from the lowest frequency setting means 13. On the other hand, the operating frequency f of the compressor 1 is read by the frequency detecting means l4, and the lowest frequency fo and the operating frequency f are compared by the second comparing means l5, and f≦
When the frequency is f0, the frequency setting means 16 switches the operating frequency f to the lowest frequency fo to drive the compressor 1.
従って、第３図において、高い熱交換器温度かつ低い運
転周波数条件で圧縮機１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。Therefore, as shown in FIG. 3, it is possible to prevent the discharge pressure from becoming high when the compressor 1 is driven under conditions of high heat exchanger temperature and low operating frequency, and as a result, locking of the compressor 1 or shortening the service life It is possible to prevent a decrease in
（発明の効果）
以上説明したように，本発明によれば、室外側熱交換器
の温度及び圧縮機の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、簡単な構或
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 temperature of the outdoor heat exchanger and the operating frequency of the compressor, and the discharge pressure is increased when the compressor is operating at a low frequency. Since the operating frequency is changed so as not to increase the operating frequency, it is possible to prevent locking of the compressor or shorten the life of the compressor with a simple structure.
第１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 ・・・熱交換器温度検出器、１０・・
・制御回路、１１・・・設定温度記憶手段、１２・・・
第１の比較手段、ｌ３・・・最低周波数設定手段、１４
・・・周波数検出手段、ｌ５・・・第２の比較手段、１
６・・・周波数設定手段。Fig. 1 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...Heat exchanger temperature detector , 10...
- Control circuit, 11... Set temperature storage means, 12...
First comparison means, l3...lowest frequency setting means, 14
. . . Frequency detection means, l5 . . . Second comparison means, 1
6...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、 前記室外側熱交換器の中央部付近に設けられその熱交換
器の温度ｔを検出する熱交換器温度検出器と、予め設定
された温度ｔ＿ｏを記憶している設定温度記憶手段と、
検出された温度ｔと設定温度ｔ＿ｏとを比較して検出さ
れた温度が設定温度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] In an air conditioner equipped with a compressor, an outdoor heat exchanger, an outdoor fan, a pressure reducer, an indoor heat exchanger, and an indoor fan, near the center of the outdoor heat exchanger: a heat exchanger temperature detector that is provided and detects the temperature t of the heat exchanger; a set temperature storage means that stores a preset temperature t_o;
A first device that compares the detected temperature t and the set temperature t_o and outputs a signal when the detected temperature is equal to or higher than the set temperature.
a comparison means, a lowest frequency setting means for outputting a preset lowest frequency f_o of the compressor based on the output signal from the first comparison means, and a frequency detection means for detecting the operating frequency f of the compressor. , a second device that compares the detected operating frequency f and the lowest frequency f_o and outputs a signal when the detected operating frequency is less than or equal to the lowest frequency;
An air conditioner comprising: a comparison means; and a 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 comparison means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000922A JPH03207962A (en) | 1990-01-09 | 1990-01-09 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000922A JPH03207962A (en) | 1990-01-09 | 1990-01-09 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03207962A true JPH03207962A (en) | 1991-09-11 |
Family
ID=11487181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000922A Pending JPH03207962A (en) | 1990-01-09 | 1990-01-09 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03207962A (en) |
-
1990
- 1990-01-09 JP JP2000922A patent/JPH03207962A/en active Pending
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