JPH0359342B2 - - Google Patents
Info
- Publication number
- JPH0359342B2 JPH0359342B2 JP59269800A JP26980084A JPH0359342B2 JP H0359342 B2 JPH0359342 B2 JP H0359342B2 JP 59269800 A JP59269800 A JP 59269800A JP 26980084 A JP26980084 A JP 26980084A JP H0359342 B2 JPH0359342 B2 JP H0359342B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heat exchanger
- outdoor heat
- outdoor
- detects
- 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
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、空気調和機の除霜制御装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a defrosting control device for an air conditioner.
従来の技術
ヒートポンプ式の空気調和機において、低外気
温時の暖房運転中に室外熱交換器に霜が付着し、
冷凍サイクルの能力は低下する。このため、従来
から室外熱交換器の除霜が行なわれてきた。Conventional technology In heat pump type air conditioners, frost builds up on the outdoor heat exchanger during heating operation at low outside temperatures.
The capacity of the refrigeration cycle decreases. For this reason, defrosting of outdoor heat exchangers has been conventionally performed.
従来、この除霜に入る着霜の検知方法として、
室外熱交換器の冷媒温度と、室外温度の双方から
着霜を検知する方法と、特開昭59−137773号公報
に示されるように室外温度、室外熱交換器の冷媒
温度、室外熱交換器の表面温度をそれぞれ検知
し、これらの各温度から着霜量を検知する除霜を
行なう方法がある。 Conventionally, as a method for detecting frost formation during defrosting,
A method of detecting frost formation from both the refrigerant temperature of an outdoor heat exchanger and the outdoor temperature, and the method of detecting frost formation from both the refrigerant temperature of an outdoor heat exchanger and the outdoor temperature, and the method of detecting frost formation from both the outdoor temperature, the refrigerant temperature of the outdoor heat exchanger, and the outdoor heat exchanger as shown in Japanese Patent Application Laid-Open No. 137773/1983 There is a defrosting method that detects the surface temperature of each and detects the amount of frost from each of these temperatures.
発明が解決しようとする問題点
従来の方法では、低外気温、低相対湿度状態に
おいて、室外熱交換器に着霜が進行していなくて
も無駄な除霜制御を行なう問題や、室外風量が少
なくなつた場合、室外熱交換器の冷媒温度と、室
外熱交換器表面温度の差が小さくなり、着霜して
いない場合でも誤動作するという問題がある。Problems to be Solved by the Invention In the conventional method, under conditions of low outside temperature and low relative humidity, there are problems such as unnecessary defrosting control being carried out even when frost has not progressed on the outdoor heat exchanger, and the problem that the outdoor air volume is When the amount decreases, the difference between the refrigerant temperature of the outdoor heat exchanger and the surface temperature of the outdoor heat exchanger becomes small, and there is a problem that malfunction occurs even when no frost has formed.
本発明は、上記従来の問題点を解決するもの
で、確実に室外熱交換器の着霜を検出し、無駄な
除霜制御の防止を目的としたものである。 The present invention solves the above-mentioned conventional problems, and aims to reliably detect frost formation on an outdoor heat exchanger and prevent wasteful defrosting control.
問題点を解決するための手段
この目的を達成するために本発明は、室外熱交
換器の冷媒温度を検出する第１の温度センサと、
室外熱交換器を通過する空気温度を検出する第２
の温度センサと、室外温度を検出する第３の温度
センサとにより、室外熱交換器の冷媒温度が設定
温度より低く、かつ室外温度と室外熱交換器を通
過する空気温度の差が、設定温度差より大きい場
合に除霜信号を出力する除霜信号出力回路より構
成したものである。Means for Solving the Problems In order to achieve this object, the present invention includes a first temperature sensor that detects the refrigerant temperature of an outdoor heat exchanger;
A second device that detects the temperature of the air passing through the outdoor heat exchanger.
temperature sensor and a third temperature sensor that detects the outdoor temperature, the refrigerant temperature of the outdoor heat exchanger is lower than the set temperature, and the difference between the outdoor temperature and the temperature of the air passing through the outdoor heat exchanger is the set temperature. The defrost signal output circuit is configured to output a defrost signal when the difference is greater than the difference.
作 用
この構成により、室外温度と室外熱交換器を通
過する空気温度の差、および室外熱交換器の冷媒
温度の総合信号によつて着霜の有無を検出するた
め、室外温度が高く室外風量が少ない場合や、室
外熱交換器を通過する空気温度を検出する第２の
温度センサが通風防害を受けた場合において、室
外温度と室外熱交換器を通過する空気温度の差が
大きくなつてもすぐに除霜制御を行なうことがな
いものである。Function With this configuration, the presence or absence of frost formation is detected based on the difference between the outdoor temperature and the air temperature passing through the outdoor heat exchanger, as well as the overall signal of the refrigerant temperature of the outdoor heat exchanger. When the temperature of the air passing through the outdoor heat exchanger is low, or when the second temperature sensor that detects the temperature of the air passing through the outdoor heat exchanger is protected against draft damage, the difference between the outdoor temperature and the temperature of the air passing through the outdoor heat exchanger becomes large. However, defrosting control is not performed immediately.
実施例
以下、本発明の一実施例について、第１図〜第
３図を参考に説明する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
まず第１図により、セパレート形ヒートポンプ
式空気調和機の室外機の構成について説明する。 First, the configuration of an outdoor unit of a separate heat pump type air conditioner will be explained with reference to FIG.
同図において、１はヒートポンプ式空気調和機
の室外機、２は圧縮機、３は室外熱交換器、４は
送風フアン、５は送風フアンモータ、６は区画
壁、７は室外熱交換器３の冷媒温度を検出する第
１の温度センサ、８は室外熱交換器３を通過する
空気温度を検出する第２の温度センサ、９は室外
温度を検出する第３の温度センサである。 In the figure, 1 is an outdoor unit of a heat pump type air conditioner, 2 is a compressor, 3 is an outdoor heat exchanger, 4 is a blower fan, 5 is a blower fan motor, 6 is a partition wall, and 7 is an outdoor heat exchanger 3 8 is a second temperature sensor that detects the temperature of the air passing through the outdoor heat exchanger 3, and 9 is a third temperature sensor that detects the outdoor temperature.
次に、第２図により室外熱交換器３を通過する
空気温度を検出する第２の温度センサ８の取付け
構造について説明する。ここで、第１図と同じも
のについては、同一番号を付している。 Next, the mounting structure of the second temperature sensor 8 for detecting the temperature of the air passing through the outdoor heat exchanger 3 will be explained with reference to FIG. Here, the same parts as in FIG. 1 are given the same numbers.
ここで、１０は室外熱交換器３のフイン、１１
は室外熱交換器３の銅管である。第２の温度セン
サ８は、フイン１０や銅管１１に接触しないよう
に、フイン１０と銅管１１の間に固定されてい
る。 Here, 10 is the fin of the outdoor heat exchanger 3, and 11
is the copper tube of the outdoor heat exchanger 3. The second temperature sensor 8 is fixed between the fin 10 and the copper tube 11 so as not to come into contact with the fin 10 or the copper tube 11.
次に、第３図において除霜信号出力回路は、室
外熱交換器３の冷媒温度を検出する第１の温度セ
ンサ７から出力された信号Teと設定温度T1を比
較し、Te＜T1ならば正の信号を出力するコンパ
レータ１２と、室外温度を検出する第３の温度セ
ンサ９から出力された信号Taと、室外熱交換器
３を通過する空気温度を検出する第２の温度セン
サ８から出力された信号Twの差を出力する差動
アンプ１３と、差動アンプ１３から出力された温
度差Ta−Twと設定温度差ΔT2を比較し、Ta−
Tw＞ΔT2ならば正の信号を出力するコンパレー
タ１４、コンパレータ１２，１４から出力された
正の信号により、除霜制御開始信号を出力する
ANDゲート１５により構成されている。 Next, in FIG. 3, the defrost signal output circuit compares the signal Te output from the first temperature sensor 7 that detects the refrigerant temperature of the outdoor heat exchanger 3 with the set temperature T1 , and determines that Te<T1 . Then, the comparator 12 outputs a positive signal, the signal Ta output from the third temperature sensor 9 detects the outdoor temperature, and the second temperature sensor 8 detects the temperature of the air passing through the outdoor heat exchanger 3. The differential amplifier 13 that outputs the difference between the signals Tw output from the differential amplifier 13 compares the temperature difference Ta−Tw output from the differential amplifier 13 with the set temperature difference ΔT 2 , and calculates Ta−
If Tw > ΔT 2 , the comparator 14 outputs a positive signal, and the positive signals output from the comparators 12 and 14 output a defrost control start signal.
It is composed of an AND gate 15.
上記構成において、暖房運転時、室外熱交換器
３のフイン１０表面に着霜が進行してゆくと、室
外熱交換器３の冷媒温度Teは低下してゆく。ま
た、着霜が進行すると室外熱交換器３を通過する
空気量が減少し、室外熱交換器３を通過する空気
温度Twは低下し、さらにTwを検出する第２の
温度センサ８に着霜し、Ta−Twは大きくなつ
てゆく。 In the above configuration, as frost builds up on the surface of the fins 10 of the outdoor heat exchanger 3 during heating operation, the refrigerant temperature Te of the outdoor heat exchanger 3 decreases. Additionally, as frosting progresses, the amount of air passing through the outdoor heat exchanger 3 decreases, the temperature Tw of the air passing through the outdoor heat exchanger 3 decreases, and further frost forms on the second temperature sensor 8 that detects Tw. However, Ta−Tw becomes larger.
その結果、冷媒温度Teが設定温度T1より低く
なり、Ta−Twが設定温度差ΔT2より大きくなる
と、制御回路より除霜制御開始信号が出力され、
除霜制御に入る。 As a result, when the refrigerant temperature Te becomes lower than the set temperature T1 and Ta-Tw becomes larger than the set temperature difference ΔT2 , the control circuit outputs a defrost control start signal,
Enter defrost control.
次に、暖房時において、低外気温で相対湿度が
低い場合、冷媒温度Teと温度設定T1の関係はTe
＜T1となるが、着霜が進行しないと、Ta−Tw
＜ΔT2となるため、無駄な除霜制御は行なわれな
い。また、逆風で室外機１の風量が低下した場合
や、空気温度Twを検出する第２の温度センサ８
がごみなどにより通風妨害された場合、空気温度
Twを検出する温度センサ８のまわりでは外気と
の熱交換が減少する。一方、室外熱交換器３は吸
熱しているため、空気温度Twは低下し、Ta−
Tw＞ΔT2となる。しかし、室外熱交換器３には
着霜は進行しておらず、Te＜T1となるまで除霜
制御には入らない。 Next, during heating, when the outside temperature is low and the relative humidity is low, the relationship between the refrigerant temperature Te and the temperature setting T 1 is Te
＜T 1 , but if frosting does not progress, Ta−Tw
<ΔT 2 , so unnecessary defrosting control is not performed. In addition, when the air volume of the outdoor unit 1 decreases due to a headwind, the second temperature sensor 8 detects the air temperature Tw.
If the ventilation is obstructed by debris etc., the air temperature will decrease.
Heat exchange with outside air is reduced around the temperature sensor 8 that detects Tw. On the other hand, since the outdoor heat exchanger 3 is absorbing heat, the air temperature Tw decreases and Ta-
Tw > ΔT 2 . However, frost has not progressed on the outdoor heat exchanger 3, and defrosting control is not started until Te<T 1 .
したがつて、室外熱交換器３の冷媒温度Te、
室外熱交換器３を通過する空気温度Tw、室外温
度Taの３つの温度を検出し、室外熱交換器３へ
の着霜を確実に検知し、正確な除霜制御を行なう
という効果がある。 Therefore, the refrigerant temperature Te of the outdoor heat exchanger 3,
Three temperatures, the temperature Tw of the air passing through the outdoor heat exchanger 3 and the outdoor temperature Ta, are detected, and frost formation on the outdoor heat exchanger 3 is reliably detected and accurate defrosting control is performed.
発明の効果
以上のように本発明は、室外熱交換器冷媒温
度、室外熱交換器を通過する空気温度および室外
温度を検出することにより、室外熱交換器への着
霜を確実に検出し、正確な除霜制御を行ない、無
駄な除霜制御を防止することができる。したがつ
て、無駄な除霜による暖房の中断が防止でき、快
適さが損なわれることもない。Effects of the Invention As described above, the present invention reliably detects frost formation on the outdoor heat exchanger by detecting the outdoor heat exchanger refrigerant temperature, the air temperature passing through the outdoor heat exchanger, and the outdoor temperature. It is possible to perform accurate defrosting control and prevent wasteful defrosting control. Therefore, interruption of heating due to wasteful defrosting can be prevented, and comfort will not be impaired.
第１図は、本発明の一実施例におけるヒートポ
ンプ式空気調和機の室外機の構成図、第２図は、
同空気調和機における室外熱交換器の要部斜視
図、第３図は、同空気調和機における除霜制御装
置の除霜信号出力回路図である。
３……室外熱交換器、７……第１の温度セン
サ、８……第２の温度センサ、９……第３の温度
センサ。
FIG. 1 is a configuration diagram of an outdoor unit of a heat pump type air conditioner according to an embodiment of the present invention, and FIG.
FIG. 3, which is a perspective view of a main part of the outdoor heat exchanger in the air conditioner, is a defrost signal output circuit diagram of the defrost control device in the air conditioner. 3... Outdoor heat exchanger, 7... First temperature sensor, 8... Second temperature sensor, 9... Third temperature sensor.
Claims (1)
度センサと、室外熱交換器を通過する空気温度を
検出する第２の温度センサと、室外温度を検出す
る第３の温度センサと、前記第１の温度センサの
検出温度が、設定温度より低くかつ、前記第２と
第３の温度センサの検出温度の差が、設定温度差
よりも大きい場合に除霜信号を出力する除霜信号
出力回路より構成した空気調和機の除霜制御装
置。1 a first temperature sensor that detects the refrigerant temperature of the outdoor heat exchanger, a second temperature sensor that detects the temperature of the air passing through the outdoor heat exchanger, a third temperature sensor that detects the outdoor temperature, Defrosting signal output that outputs a defrosting signal when the detected temperature of the first temperature sensor is lower than the set temperature and the difference between the detected temperatures of the second and third temperature sensors is larger than the set temperature difference. A defrosting control device for air conditioners consisting of a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59269800A JPS61147039A (en) | 1984-12-20 | 1984-12-20 | Defrosting control device of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59269800A JPS61147039A (en) | 1984-12-20 | 1984-12-20 | Defrosting control device of air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61147039A JPS61147039A (en) | 1986-07-04 |
| JPH0359342B2 true JPH0359342B2 (en) | 1991-09-10 |
Family
ID=17477339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59269800A Granted JPS61147039A (en) | 1984-12-20 | 1984-12-20 | Defrosting control device of air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61147039A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4717932B2 (en) * | 2009-01-07 | 2011-07-06 | シャープ株式会社 | Hot air heater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5121415U (en) * | 1974-08-05 | 1976-02-17 | ||
| JPS55143346A (en) * | 1979-04-27 | 1980-11-08 | Hitachi Ltd | Controller for defrosting air conditioner |
-
1984
- 1984-12-20 JP JP59269800A patent/JPS61147039A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61147039A (en) | 1986-07-04 |
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