JPH03207952A - Air-conditioner - Google Patents
Air-conditionerInfo
- Publication number
- JPH03207952A JPH03207952A JP2000921A JP92190A JPH03207952A JP H03207952 A JPH03207952 A JP H03207952A JP 2000921 A JP2000921 A JP 2000921A JP 92190 A JP92190 A JP 92190A JP H03207952 A JPH03207952 A JP H03207952A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- compressor
- operating frequency
- pressure value
- pressure
- 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
- 239000003507 refrigerant Substances 0.000 claims abstract description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 9
- 238000004904 shortening Methods 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 1
- 238000005461 lubrication 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
Abstract
Description
【発明の詳細な説明】
（産業七の利用分野）
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 Application of Industry 7) 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，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。(Prior art) Generally, an air conditioner has a compressor 1 as shown in Fig. 3.
, an outdoor heat exchanger 2, a pressure reducer 3, and an indoor heat exchanger 4 are sequentially connected to form a refrigeration cycle.
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 of time with a small cooling capacity. .
（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
に冷媒の吐出圧力が高くなると，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。(Problem to be solved by the invention) However, as mentioned above, when the refrigerant discharge pressure increases while the compressor is operating at a low frequency, a locking phenomenon occurs due to insufficient lubrication of the refrigerant oil inside the compressor. However, there was a problem that the lifespan 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、圧縮機の冷媒吐出圧力値及び運転周波数
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。The present invention solves the above problems by detecting the refrigerant discharge pressure value and operating frequency of the compressor during cooling operation of an air conditioner, and when predetermined conditions are met, the operating frequency of the compressor is adjusted in advance. An object of the present invention is to provide an air conditioner that is set to a predetermined lowest frequency and that prevents an abnormal increase in the discharge pressure of a compressor during cooling operation and operation at a low frequency.
（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、圧縮機の
吐出圧力値を検出する圧力検出器と，予め設定された圧
力値を記憶している設定圧力記憶手段と、検出された圧
力値と設定圧力値とを比較して検出された圧力値が設定
圧力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成とするものである。(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 pressure detector detects the discharge pressure value of the compressor, a set pressure storage means that stores a preset pressure value, and the detected pressure value and the set pressure. a first comparing means that outputs a signal when the detected pressure value is equal to or higher than the set pressure value; A minimum frequency setting means for outputting a frequency, a frequency detection means for detecting an operating frequency of the compressor, and a signal is output when the detected operating frequency is less than or equal to the minimum frequency by comparing the detected operating frequency and the minimum frequency. The second comparison means outputs an output signal, and the frequency setting means sets the operating frequency of the compressor to the lowest frequency based on the output signal from the second comparison means.
（作 用）
この構成により，空気調和機の冷房運転時において、圧
縮機の吐出圧力、運転周波数を検知しながら運転を継続
し、ある吐出圧力値以上では、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 configuration, during cooling operation of the air conditioner, the operation continues while detecting the discharge pressure and operating frequency of the compressor, and when the discharge pressure exceeds a certain value, the operating frequency of the compressor falls 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、↓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
サイクルが構或されている。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は圧力検
出器で、圧縮機１の吐出圧力値を検出する。１０は制御
回路で，圧力検出器９で検出された圧力値Ｐと設定圧力
値Ｐｏ、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、圧力値Ｐが設定圧力値ＰＯ以上で、かつ圧
縮機運転周波数ｆが設定周波数ｆｏ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 Figure 3, ↓ 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, and these make up the refrigeration cycle. It has been. 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. A pressure detector 9 detects the discharge pressure value of the compressor 1. 10 is a control circuit that compares the pressure value P detected by the pressure detector 9 with the set pressure value Po, and the compressor operating frequency f with the set frequency fo, and determines whether the pressure value P is equal to or higher than the set pressure value PO, and When the compressor operating frequency f is less than or equal to the set frequency fo, the compressor operating frequency is set to io.
第↓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。↓ is a block diagram of the main part of this embodiment, and FIG. 2 is a flowchart showing its operation.
第１図において、制御回路１０は、予め設定された圧力
値Ｐｏを記憶している設定圧力記憶手段ｌ１と，圧力検
出器９で検出された圧力値Ｐと設定圧力記憶手段１１に
設定された設定圧力値Ｐｏとを比較する第１の比較手段
１２と５予め圧縮機１の最低周波数ｆｏが設定され、第
１の比較手段ｌ２がらの出方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ｌ３と，圧縮機ｌの運転
周波数ｆを検出する周波数検出手段１４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ＩＯ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ｆｏに設定する周波数設定手段■６とを備えている
。In FIG. 1, the control circuit 10 includes a set pressure storage means l1 that stores a preset pressure value Po, and a pressure value P detected by the pressure detector 9 and the set pressure storage means 11. First comparing means 12 and 5 for comparing the set pressure value Po, the lowest frequency fo of the compressor 1 is set in advance, and the lowest frequency fo is determined by the output signal from the first comparing means 12.
The lowest frequency setting means 13 outputs the operating frequency f of the compressor 1, the frequency detecting means 14 detects the operating frequency f of the compressor 1, and the detected operating frequency f is compared with the lowest frequency fo, and the detected operating frequency f is the lowest frequency. a second comparing means 15 which outputs a signal when the value is less than IO; and this second comparing means l5.
frequency setting means (6) for setting the operating frequency of the compressor 1 to the lowest frequency fo in response to an output signal from the compressor.
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、圧力検出器９により圧力値Ｐが読み込ま
れ，設定圧力記憶手段１ｌに設定された設定圧力値Ｐｏ
と第１の比較手段ｌ２で比較され、Ｐ≧ＰＯ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１４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≦ｆｏである
ときに、周波数設定手段ｌ６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。従って、
第３図において、高い吐出圧力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異常に高い状態になる
ことを防止でき、その結果、圧縮機ｌのロノクの発生、
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. At the start of the cooling operation, the pressure value P is read by the pressure detector 9, and the set pressure value Po set in the set pressure storage means 1l is read.
is compared by the first comparing means l2, and when P≧PO, 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 14, the lowest frequency fo and the operating frequency f are compared by the second comparing means l5, and when f≦fo, the frequency setting means l6 The compressor 1 is driven by switching the operating frequency f to the lowest frequency fo. Therefore,
In FIG. 3, it is possible to prevent the discharge pressure from becoming abnormally high by driving the compressor 1 under conditions of high discharge pressure and low operating frequency.
Alternatively, reduction in life can be prevented.
（発明の効果）
以上説明したように、本発明によれば、圧縮機の吐出圧
力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, the operation is continued while the discharge pressure and operating frequency of the compressor are detected, and the discharge pressure is prevented from increasing when the compressor is operated at a low frequency. Since the operating frequency is changed, it has the effect of preventing locking of the compressor or shortening its life with a simple structure.
第↓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 ・・圧力検出器，１０ ・・制御
回路、ｌ１ ・・・設定圧力記憶手段，１２・・・第１
の比較手段、ｌ３・・・最低周波数設定手段、ｌ４
・・周波数検出手段、ｌ５ ・第２の比較手段、１６
・・・周波数設定手段。↓ 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 side fan, 6... Indoor side fan, 7 - Compressor drive circuit, 9... Pressure detector, 10... Control circuit, l1... Set pressure storage means, 12... First
comparison means, l3...minimum frequency setting means, l4
・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、 前記圧縮機の冷媒吐出部に設けられ冷媒吐出圧力値Ｐを
検出する圧力検出器と、予め設定された圧力値Ｐ＿ｏを
記憶している設定圧力記憶手段と、検出された圧力値Ｐ
と設定圧力値Ｐ＿ｏとを比較して検出された圧力値が設
定圧力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 comprising a compressor, an outdoor heat exchanger, an outdoor fan, a pressure reducer, an indoor heat exchanger, and an indoor fan, comprising: a refrigerant discharging section of the compressor; A pressure detector that detects a discharge pressure value P, a set pressure storage means that stores a preset pressure value P_o, and a detected pressure value P
and a set pressure value P_o and output a signal when the detected pressure value is equal to or higher than the set pressure value; A minimum frequency setting means for outputting the lowest frequency f_o of the compressor, a frequency detection means for detecting the operating frequency f of the compressor, and an operation detected by comparing the detected operating frequency f and the minimum frequency f_o. a second comparison means for outputting a signal when the frequency is below the minimum frequency; and a frequency setting means for setting the operating frequency of the compressor to the minimum frequency f_o based on the output signal from the second comparison means. An air conditioner characterized by being equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000921A JPH03207952A (en) | 1990-01-09 | 1990-01-09 | Air-conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000921A JPH03207952A (en) | 1990-01-09 | 1990-01-09 | Air-conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03207952A true JPH03207952A (en) | 1991-09-11 |
Family
ID=11487150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000921A Pending JPH03207952A (en) | 1990-01-09 | 1990-01-09 | Air-conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03207952A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7712320B2 (en) | 2003-04-23 | 2010-05-11 | Kendro Laboratory Products, Inc. | Compressor operation following sensor failure |
-
1990
- 1990-01-09 JP JP2000921A patent/JPH03207952A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7712320B2 (en) | 2003-04-23 | 2010-05-11 | Kendro Laboratory Products, Inc. | Compressor operation following sensor failure |
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