JP3337264B2 - Air conditioner defroster - Google Patents
Air conditioner defrosterInfo
- Publication number
- JP3337264B2 JP3337264B2 JP07913193A JP7913193A JP3337264B2 JP 3337264 B2 JP3337264 B2 JP 3337264B2 JP 07913193 A JP07913193 A JP 07913193A JP 7913193 A JP7913193 A JP 7913193A JP 3337264 B2 JP3337264 B2 JP 3337264B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- defrosting
- outdoor heat
- opening degree
- expansion valve
- 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 - Fee Related
Links
Landscapes
- Air Conditioning Control Device (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は空気調和機の除霜装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defroster for an air conditioner.
【０００２】[0002]
【従来の技術】従来の空気調和機の１例が図４に示され
ている。図４において、１はインバータ駆動圧縮機、２
は四方切換弁、３は室内熱交換器、４は電動式膨張弁、
５は室外熱交換器で、これらにより冷凍サイクルが構成
される。冷房運転時、冷媒は破線矢印で示すように循環
し、暖房運転時には冷媒は実線矢印で示すように循環す
る。2. Description of the Related Art An example of a conventional air conditioner is shown in FIG. In FIG. 4, 1 is an inverter-driven compressor, 2
Is a four-way switching valve, 3 is an indoor heat exchanger, 4 is an electric expansion valve,
An outdoor heat exchanger 5 constitutes a refrigeration cycle. During the cooling operation, the refrigerant circulates as indicated by a dashed arrow, and during the heating operation, the refrigerant circulates as indicated by a solid arrow.
【０００３】６は上記圧縮機１を負荷に対応した周波数
で運転するためのインバータ、８は圧縮機１の吐出管温
度を検出する温度検出器、７は温度検出器８からの信号
を受けて膨張弁４の開度を制御する制御装置である。９
は上記圧縮機１の出口のホットガスを室外熱交換器５に
導入するデフロスト回路で、このデフロスト回路９には
開閉弁10が介装されている。[0003] Reference numeral 6 denotes an inverter for operating the compressor 1 at a frequency corresponding to a load, 8 denotes a temperature detector for detecting a discharge pipe temperature of the compressor 1, and 7 receives a signal from the temperature detector 8. This is a control device that controls the opening of the expansion valve 4. 9
Is a defrost circuit for introducing hot gas at the outlet of the compressor 1 into the outdoor heat exchanger 5, and the defrost circuit 9 is provided with an on-off valve 10.
【０００４】暖房運転時、室外熱交換器５に着霜したと
きは、開閉弁10を開き、圧縮機１出口のホットガスを室
外熱交換器５に導入することにより霜を溶融除去する。[0004] During the heating operation, if frost forms on the outdoor heat exchanger 5, the on-off valve 10 is opened and hot gas at the outlet of the compressor 1 is introduced into the outdoor heat exchanger 5 to melt and remove the frost.
【０００５】[0005]
【発明が解決しようとする課題】上記従来の空気調和機
においては、室外熱交換器５への着霜が進行すると、室
外熱交換器５の汲上熱量が次第に低下し、これに伴って
圧縮機１に吸入されるガス冷媒の過熱度が低下するの
で、図５に示すように吐出管温度が低下し、これに応じ
て膨張弁４の開度が次第に小さくなる。室外熱交換器５
への着霜量が所定値に達すると、開閉弁10を開いて除霜
運転が行われるが、この除霜運転終了後の暖房運転再開
時、膨張弁４の開度は除霜運転開始時の開度に復帰す
る。この開度は無着霜時のそれより大巾に小さいので、
吐出管温度が過大となり、吐出管温度による膨張弁４の
制御が不可能となってしまうという不具合があった。In the above-mentioned conventional air conditioner, as the frost formation on the outdoor heat exchanger 5 progresses, the amount of heat pumped by the outdoor heat exchanger 5 gradually decreases. Since the degree of superheat of the gas refrigerant sucked into 1 is reduced, the temperature of the discharge pipe is reduced as shown in FIG. Outdoor heat exchanger 5
When the amount of frost reaches the predetermined value, the on-off valve 10 is opened to perform the defrosting operation. When the heating operation is restarted after the end of the defrosting operation, the opening of the expansion valve 4 is set at the start of the defrosting operation. It returns to the opening of. Since this opening is much smaller than that when there is no frost,
There has been a problem that the temperature of the discharge pipe becomes excessively high, and it becomes impossible to control the expansion valve 4 based on the temperature of the discharge pipe.
【０００６】[0006]
【課題を解決するための手段】本発明は上記課題を解決
するために発明されたものであって、その要旨とすると
ころは、圧縮機、室外熱交換器、電動式膨張弁及び室内
熱交換器により冷凍サイクルを構成するとともに上記圧
縮機出口と上記室外熱交換器の冷媒液側入口とをデフロ
スト回路によって連結し、上記室外熱交換器に着霜した
とき上記デフロスト回路に介装された開閉弁を開として
上記圧縮機出口のホットガスを上記デフロスト回路を経
て上記室外熱交換器にその冷媒液側入口から導入して除
霜する空気調和機の除霜装置において、上記除霜の終了
を検知する除霜終了検知手段と、暖房運転時上記圧縮機
の吐出管温度に応じて上記電動式膨張弁の開度を決定す
る開度決定手段と上記除霜終了検知手段からの検出信号
を受けたとき上記電動式膨張弁の開度を上記吐出管温度
の如何に拘わらず上記室外熱交換器の無着霜時の開度に
戻す無着霜時開度指令手段を具備する制御装置を設けた
ことを特徴とする空気調和機の除霜装置にある。SUMMARY OF THE INVENTION The present invention was invented to solve the above problems, and has as its gist the compressor, an outdoor heat exchanger, collector Doshiki expansion valve and an indoor heat The refrigeration cycle is constituted by the exchanger and the pressure
Defloat the compressor outlet and the refrigerant liquid side inlet of the outdoor heat exchanger.
Linked by strike circuit, the refrigerant the compressor outlet of the hot gas on-off valve interposed in the defrosting circuit when frost formation on the outdoor heat exchanger is opened to the outdoor heat exchanger through the defrost circuit In a defrosting device for an air conditioner for introducing and defrosting from a liquid side inlet , a defrosting end detecting means for detecting the end of the defrosting, and the compressor during a heating operation.
Determines the opening of the electric expansion valve according to the discharge pipe temperature
When the detection signal is received from the opening degree determining means and the defrosting end detecting means, the opening degree of the electric expansion valve is set to the opening degree when the outdoor heat exchanger is not frosted regardless of the discharge pipe temperature. A defrosting device for an air conditioner , comprising: a control device including a non-frosting opening degree instructing means for returning to a normal temperature.
【０００７】[0007]
【作用】本発明においては、上記構成を具えているた
め、除霜終了検知手段から除霜終了の検出信号を受けた
とき、制御装置は電動式膨張弁の開度を吐出管温度の如
何に拘わらず室外熱交換器の無着霜時の開度に戻す。According to the present invention, since the above configuration is provided, a detection signal of the completion of the defrost is received from the defrost completion detecting means .
At this time, the control device determines the opening of the electric expansion valve as the discharge pipe temperature.
Regardless of what, the opening degree of the outdoor heat exchanger is returned to the frost-free state.
【０００８】[0008]
【実施例】本発明の１実施例が図１及び図２に示されて
いる。図２に示されるように、バイパス回路９に介装さ
れた開閉弁10が閉とされたとき、即ち、除霜終了の信号
が開閉弁10から信号線12を介して制御装置70に入力され
るようになっている。他の構成は従来のものと同様であ
り、対応する部材には同じ符号を付してその説明を省略
する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS. As shown in FIG. 2, when the on-off valve 10 interposed in the bypass circuit 9 is closed, that is, a signal indicating completion of defrost is input from the on-off valve 10 to the control device 70 via the signal line 12. It has become so. The other configuration is the same as that of the conventional one, and the corresponding members are denoted by the same reference numerals and the description thereof is omitted.
I do.
【０００９】制御装置70の制御ブロック図が図１に示さ
れている。制御装置70は無着霜時開度指令手段71、膨張
弁４の開度決定手段72及び出力手段73からなり温度検出
器８によって検出された圧縮機１の吐出管温度が開度決
定手段72に入力され、開閉弁10の閉弁の信号は信号線12
を介して無着霜時開度指令手段71に入力される。出力手
段73の出力は信号線13を介して電動式膨張弁４に入力さ
れるようになっている。A control block diagram of the control device 70 is shown in FIG. The control device 70 includes an frost-free opening degree instructing means 71, an opening degree determining means 72 of the expansion valve 4, and an output means 73. The discharge pipe temperature of the compressor 1 detected by the temperature detector 8 is used as the opening degree determining means 72. The signal for closing the on-off valve 10 is input to the signal line 12
Is input to the frost-free opening degree command means 71 via the. The output of the output means 73 is input to the electric expansion valve 4 via the signal line 13.
【００１０】しかして、暖房運転時、温度検出器８によ
って検出された吐出管温度が開度決定手段72に入力され
ると、開度決定手段72は検出された吐出管温度に応じて
膨張弁４の開度を決定し、決定された開度は出力手段73
を経て膨張弁４に入力され、膨張弁４は吐出管温度に対
応する開度となる。[0010] Thus, during the heating operation, when the discharge pipe temperature detected by the temperature detection can 8 is inputted to the opening determining means 72, the opening degree determination unit 72 in accordance with the detected discharge pipe temperature expansion The opening of the valve 4 is determined, and the determined opening is output means 73.
, And is input to the expansion valve 4, and the expansion valve 4 has an opening corresponding to the discharge pipe temperature.
【００１１】室外熱交換器５の除霜が終了し、開閉弁10
が閉塞されると、これからの信号が無着霜時開度指令手
段71に入力される。When the defrosting of the outdoor heat exchanger 5 is completed, the on-off valve 10
Is closed, a signal from this is input to the frost-free opening degree command means 71.
【００１２】指令手段71からの指令信号が開度決定手段
72に入力されると、開度決定手段72は吐出管温度の如何
に拘わらず膨張弁４の開度を室外熱交換器の無着霜時の
開度とする旨を決定する。決定された開度は出力手段73
を経て膨張弁４に出力され、膨張弁４の開度は室外熱交
換器の無着霜時の開度となる。The command signal from the command means 71 is used to determine the opening degree.
Is input to 72, the opening degree determining means 72 whether the discharge pipe temperature
Regardless of this , it is determined that the opening of the expansion valve 4 is set to the opening when the outdoor heat exchanger is not frosted. The determined opening degree is output means 73
Through the output to the expansion valve 4, the opening degree of the expansion valve 4 is the outdoor heat exchange
This is the opening when the exchanger is not frosted.
【００１３】このように、室外熱交換器５の除霜が終了
すると、図３に示すように、膨張弁４の開度を無着霜時
の開度Ａに復帰させるので、暖房運転再開時の吐出管温
度の過度の上昇を防止することができ、従って、以後の
暖房運転において膨張弁４の開度を吐出管温度により円
滑に制御しうる。As described above, when the defrosting of the outdoor heat exchanger 5 is completed, as shown in FIG. 3, the opening of the expansion valve 4 is returned to the opening A when no frost is formed. Can be prevented from increasing excessively, and the opening degree of the expansion valve 4 can be smoothly controlled by the discharge pipe temperature in the subsequent heating operation.
【００１４】[0014]
【発明の効果】本発明によれば、除霜終了検知手段から
除霜終了の検知信号を受けたとき電動式膨張弁の開度を
直ちに吐出管温度の如何に拘わらず室外熱交換器の無着
霜時の開度に戻すので、暖房運転再開時における吐出管
温度のオーバーシュート及びこれに基く空気調和機の制
御不能を防止できる。According to the present invention, the defrosting completion detecting means
When the detection signal of the completion of the defrost is received, the opening of the electric expansion valve is immediately returned to the opening when the outdoor heat exchanger is not frosted regardless of the temperature of the discharge pipe. It is possible to prevent the temperature from overshooting and the control failure of the air conditioner based on the overshooting.
【図１】本発明の１実施例に係る空気調和機の制御ブロ
ック図である。FIG. 1 is a control block diagram of an air conditioner according to one embodiment of the present invention.
【図２】上記実施例に係わる空気調和機の系統図であ
る。FIG. 2 is a system diagram of the air conditioner according to the embodiment.
【図３】上記実施例における膨張弁の開度及び吐出管温
度の時間的変化を示す線図である。FIG. 3 is a diagram showing a temporal change of an opening degree of an expansion valve and a temperature of a discharge pipe in the embodiment.
【図４】従来の空気調和機の系統図である。FIG. 4 is a system diagram of a conventional air conditioner.
【図５】従来の空気調和機における膨張弁の開度及び吐
出管温度の時間的変化を示す線図である。FIG. 5 is a diagram showing a temporal change of an opening degree of an expansion valve and a discharge pipe temperature in a conventional air conditioner.
１ 圧縮機 ３ 室内熱交換器 ４ 電動式膨張弁 ５ 室外熱交換器 ８ 温度検出器 ９ デフロスト回路 10 開閉弁 70 制御装置 71 無着霜時開度指令手段 72 開度決定手段 DESCRIPTION OF SYMBOLS 1 Compressor 3 Indoor heat exchanger 4 Electric expansion valve 5 Outdoor heat exchanger 8 Temperature detector 9 Defrost circuit 10 On / off valve 70 Control device 71 Non-frosting opening command means 72 Opening determination means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮澤 賢一 愛知県西春日井郡西枇杷島町字旭町三丁 目１番地 三菱重工業株式会社 エアコ ン製作所内 (56)参考文献 特開 昭64−49870（ＪＰ，Ａ) 特開 平２−17370（ＪＰ，Ａ) 特開 平１−127873（ＪＰ，Ａ) 特開 平１−134182（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 47/02 530 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenichi Miyazawa 3-1-1 Asahicho, Nishi-Biwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Aircon Works (56) References JP-A-64-49870 (JP) JP-A-2-17370 (JP, A) JP-A-1-127873 (JP, A) JP-A-1-134182 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB Name) F25B 47/02 530
Claims (1)
び室内熱交換器により冷凍サイクルを構成するとともに
上記圧縮機出口と上記室外熱交換器の冷媒液側入口とを
デフロスト回路によって連結し、上記室外熱交換器に着
霜したとき上記デフロスト回路に介装された開閉弁を開
として上記圧縮機出口のホットガスを上記デフロスト回
路を経て上記室外熱交換器にその冷媒液側入口から導入
して除霜する空気調和機の除霜装置において、上記除霜
の終了を検知する除霜終了検知手段と、暖房運転時上記
圧縮機の吐出管温度に応じて上記電動式膨張弁の開度を
決定する開度決定手段と上記除霜終了検知手段からの検
出信号を受けたとき上記電動式膨張弁の開度を上記吐出
管温度の如何に拘わらず上記室外熱交換器の無着霜時の
開度に戻す無着霜時開度指令手段を具備する制御装置を
設けたことを特徴とする空気調和機の除霜装置。1. A compressor, an outdoor heat exchanger, together constituting the refrigeration cycle by electrodeposition Doshiki expansion valve and an indoor heat exchanger
The compressor outlet and the refrigerant liquid-side inlet of the outdoor heat exchanger are
Linked by defrost circuit, the refrigerant the compressor outlet of the hot gas on-off valve interposed in the defrosting circuit when frost formation on the outdoor heat exchanger is opened to the outdoor heat exchanger through the defrost circuit in the defrosting device of the air conditioner to the defrosting is introduced from the liquid side inlet, and the defrosting completion detecting means for detecting the completion of the defrosting, the heating operation during the
The opening of the electric expansion valve is adjusted according to the discharge pipe temperature of the compressor.
When receiving the detection signal from the opening degree determining means and the defrosting end detecting means to determine the opening degree of the electric expansion valve at the time of no frost formation of the outdoor heat exchanger regardless of the discharge pipe temperature. A control device equipped with a non-frosting opening degree command means for returning to the opening degree
A defroster for an air conditioner, wherein the defroster is provided .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07913193A JP3337264B2 (en) | 1993-03-11 | 1993-03-11 | Air conditioner defroster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07913193A JP3337264B2 (en) | 1993-03-11 | 1993-03-11 | Air conditioner defroster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06265243A JPH06265243A (en) | 1994-09-20 |
| JP3337264B2 true JP3337264B2 (en) | 2002-10-21 |
Family
ID=13681401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07913193A Expired - Fee Related JP3337264B2 (en) | 1993-03-11 | 1993-03-11 | Air conditioner defroster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3337264B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945059B1 (en) * | 2004-09-08 | 2005-09-20 | Carrier Corporation | Refrigerant cycle with defrost termination control |
| JP6408792B2 (en) * | 2014-05-30 | 2018-10-17 | シャープ株式会社 | Air conditioner, air conditioner control method, and control program for air conditioner |
-
1993
- 1993-03-11 JP JP07913193A patent/JP3337264B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06265243A (en) | 1994-09-20 |
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