JPH06174345A - Defrosting device for outdoor heat exchanger for heat pump type air conditioner - Google Patents
Defrosting device for outdoor heat exchanger for heat pump type air conditionerInfo
- Publication number
- JPH06174345A JPH06174345A JP4351124A JP35112492A JPH06174345A JP H06174345 A JPH06174345 A JP H06174345A JP 4351124 A JP4351124 A JP 4351124A JP 35112492 A JP35112492 A JP 35112492A JP H06174345 A JPH06174345 A JP H06174345A
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- heat exchanger
- outdoor heat
- temperature
- heat pump
- 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
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ヒートポンプ式空気調
和装置の室外熱交換器の除霜装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defroster for an outdoor heat exchanger of a heat pump type air conditioner.
【０００２】[0002]
【従来の技術】従来、空気調和装置をヒートポンプモー
ド（暖房モード）で運転している時に室外熱交換器に着
霜した場合には、運転モードを冷房モードに切り換え高
温ガスを室外熱交換器に流して強制除霜し、或いは空気
調和装置のコンプレッサを停止して自然除霜していた。2. Description of the Related Art Conventionally, when frost is formed on the outdoor heat exchanger while the air conditioner is operating in the heat pump mode (heating mode), the operation mode is switched to the cooling mode and hot gas is transferred to the outdoor heat exchanger. It was run by forced defrosting or the compressor of the air conditioner was stopped to defrost naturally.
【０００３】[0003]
【発明が解決しようとする課題】従来の除霜方法では、
除霜時に室内吹出空気温度が低下し、また、連続したヒ
ートポンプ運転が可能な環境条件の幅が狭いという問題
があった。本発明は、上記の問題に鑑みてなされたもの
であり、除霜時の室内吹出空気温度の低下を防止でき、
且つ連続したヒートポンプ運転が可能な環境条件の幅を
拡大できるヒートポンプ式空気調和装置の室外熱交換器
の除霜装置を提供することを目的とする。SUMMARY OF THE INVENTION In the conventional defrosting method,
There was a problem that the temperature of the air blown out from the room decreased during defrosting, and the range of environmental conditions under which continuous heat pump operation was possible was narrow. The present invention has been made in view of the above problems, and can prevent a decrease in the indoor blown air temperature during defrosting,
An object of the present invention is to provide a defrosting device for an outdoor heat exchanger of a heat pump type air conditioner, which can expand the range of environmental conditions that enable continuous heat pump operation.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明においては、室外熱交換器の冷媒出口の下流
に配設された冷媒温度検出手段と、室外熱交換器の冷媒
入口の上流に配設され、冷媒温度検出手段が検出した冷
媒温度に応じて、冷媒温度が高い場合には開度が増大
し、冷媒温度が低い場合には開度が減少するように開閉
制御される膨張弁と、膨張弁と冷媒温度検出手段との間
の冷媒配管内にある冷媒を加熱する冷媒加熱手段と、室
外熱交換器の着霜を検出する着霜検出手段と、ヒートポ
ンプモード時に室外熱交換器の着霜が検出された場合に
冷媒加熱手段を作動させる加熱制御手段とを備えるヒー
トポンプ式空気調和装置の室外熱交換器の除霜装置を提
供する。In order to solve the above-mentioned problems, in the present invention, the refrigerant temperature detecting means arranged downstream of the refrigerant outlet of the outdoor heat exchanger and the refrigerant inlet of the outdoor heat exchanger. According to the refrigerant temperature detected by the refrigerant temperature detecting means arranged upstream, the opening degree is controlled to increase when the refrigerant temperature is high and to decrease the opening degree when the refrigerant temperature is low. Expansion valve, refrigerant heating means for heating the refrigerant in the refrigerant pipe between the expansion valve and the refrigerant temperature detection means, frost detection means for detecting frost formation of the outdoor heat exchanger, outdoor heat in the heat pump mode There is provided a defrosting device for an outdoor heat exchanger of a heat pump type air conditioner, comprising: a heating control unit that operates a refrigerant heating unit when frost formation on the exchanger is detected.
【０００５】[0005]
【作用】本発明においては、ヒートポンプモード時に室
外熱交換器の着霜が検出されると冷媒加熱手段が作動
し、冷媒温度検出手段が検出する冷媒温度が上昇する。
この結果、膨張弁の開度が増大し、室外熱交換器内の冷
媒の圧力が増大し、冷媒の蒸発温度が上昇し、除霜され
る。In the present invention, when frost formation on the outdoor heat exchanger is detected in the heat pump mode, the refrigerant heating means operates and the refrigerant temperature detected by the refrigerant temperature detecting means rises.
As a result, the opening degree of the expansion valve is increased, the pressure of the refrigerant in the outdoor heat exchanger is increased, the evaporation temperature of the refrigerant is increased, and defrosting is performed.
【０００６】[0006]
【実施例】本発明の実施例に係るヒートポンプ式空気調
和装置の室外熱交換器の除霜装置を、図１に基づいて説
明する。図１において、１はヒートポンプ式空気調和装
置の室外熱交換器である。室外熱交換器１の冷媒入口１
ａの上流には膨張弁２が配設され、室外熱交換器１の冷
媒出口１ｂの下流には感温筒３が配設されている。配管
４が膨張弁２を感温筒３に連通させている。配管４を満
たす流体が、感温筒３が検出した冷媒温度を圧力の形で
膨張弁２に伝達し、冷媒温度が高い場合には膨張弁２の
開度を増大させ、冷媒温度が低い場合には膨張弁２の開
度を減少させる。これにより、室外熱交換器１の冷媒出
口１ｂでの冷媒温度と冷媒入口１ａでの冷媒温度との
差、すなわち加熱度が適切な値に維持され、ひいては室
外熱交換器の適切な作動状態が維持される。室外熱交換
器１には、放熱フィンの温度を検出するための感温素子
５が取付けられている。室外熱交換器１の冷媒出口１ｂ
と感温筒３との間の冷媒配管部に、ヒータ６が配設され
ている。ヒータ６の作動はマイコンを有するコントロー
ルユニット７によって制御される。コントロールユニッ
ト７には、感温素子５からのフィン温度信号と、ヒート
ポンプ式空気調和装置の図示しない運転モードスイッチ
からの運転モード信号とが入力され、コントロールユニ
ット７からは、ヒータ６に制御信号が出力される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A defrosting device for an outdoor heat exchanger of a heat pump type air conditioner according to an embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 is an outdoor heat exchanger of a heat pump type air conditioner. Refrigerant inlet 1 of outdoor heat exchanger 1
An expansion valve 2 is provided upstream of a, and a temperature sensitive tube 3 is provided downstream of the refrigerant outlet 1b of the outdoor heat exchanger 1. A pipe 4 connects the expansion valve 2 to the temperature sensitive cylinder 3. When the fluid filling the pipe 4 transmits the refrigerant temperature detected by the temperature sensitive tube 3 to the expansion valve 2 in the form of pressure, increases the opening of the expansion valve 2 when the refrigerant temperature is high, and when the refrigerant temperature is low In order to reduce the opening degree of the expansion valve 2. As a result, the difference between the refrigerant temperature at the refrigerant outlet 1b and the refrigerant temperature at the refrigerant inlet 1a of the outdoor heat exchanger 1, that is, the degree of heating is maintained at an appropriate value, and thus the appropriate operating state of the outdoor heat exchanger is maintained. Maintained. A temperature sensitive element 5 for detecting the temperature of the heat radiation fins is attached to the outdoor heat exchanger 1. Refrigerant outlet 1b of the outdoor heat exchanger 1
A heater 6 is arranged in the refrigerant pipe portion between the temperature sensing tube 3 and the temperature sensing tube 3. The operation of the heater 6 is controlled by the control unit 7 having a microcomputer. A fin temperature signal from the temperature sensing element 5 and an operation mode signal from an operation mode switch (not shown) of the heat pump type air conditioner are input to the control unit 7, and the control unit 7 sends a control signal to the heater 6. Is output.
【０００７】本除霜装置においては、空気調和装置がヒ
ートポンプモードで運転されている時に、室外熱交換器
１のフィン温度が所定値未満となった場合には、コント
ロールユニット７が、室外熱交換器１が着霜しているか
或いは着霜寸前の状態にあると判断し、ヒータ６を作動
させる。この結果、室外熱交換器１の冷媒出口１ｂと感
温筒３との間の冷媒配管内の冷媒温度すなわち感温筒３
が検出する冷媒温度が上昇し、膨張弁２の開度が増大
し、室外熱交換器１内の冷媒の圧力が増大し、冷媒の蒸
発温度が上昇し、除霜される。ヒータ６の発熱は、熱源
として冷媒回路内に汲み上げられ、有効利用される。上
記説明から分かるごとく、本除霜装置においては、運転
モードを冷房モードに切り換え、或いは空気調和装置の
コンプレッサを停止することなく、ヒートポンプモード
の運転を維持しつつ、室外熱交換器１の除霜をすること
ができる。In this defroster, when the fin temperature of the outdoor heat exchanger 1 becomes less than a predetermined value while the air conditioner is operating in the heat pump mode, the control unit 7 causes the outdoor heat exchanger to exchange heat. It is determined that the container 1 is frosted or is in a state of being about to be frosted, and the heater 6 is operated. As a result, the temperature of the refrigerant in the refrigerant pipe between the refrigerant outlet 1b of the outdoor heat exchanger 1 and the temperature sensitive tube 3, that is, the temperature sensitive tube 3
The temperature of the refrigerant detected by is increased, the opening degree of the expansion valve 2 is increased, the pressure of the refrigerant in the outdoor heat exchanger 1 is increased, the evaporation temperature of the refrigerant is increased, and defrosting is performed. The heat generated by the heater 6 is pumped into the refrigerant circuit as a heat source and is effectively used. As can be seen from the above description, in the present defroster, the defrosting of the outdoor heat exchanger 1 is performed while maintaining the operation in the heat pump mode without switching the operation mode to the cooling mode or stopping the compressor of the air conditioner. You can
【０００８】上記実施例では、ヒータ６を室外熱交換器
１の冷媒出口１ｂと感温筒３との間の冷媒配管部に配設
したが、ヒータ６の配設位置は上記に限定されない。例
えば、膨張弁２と室外熱交換器冷媒入口１ａの間の冷媒
配管部に配設しても良く、或いは室外熱交換器冷媒入口
１ａと室外熱交換器冷媒出口１ｂの間の熱交換部に配設
しても良い。また、上記実施例では、室外熱交換器１の
フィン温度を検出することにより着霜を検出したが、例
えば、室外熱交換器１の吹出し空気温度を検出し、或い
は、室外熱交換器冷媒出口１ｂでの冷媒温度を検出し
て、これらの温度が所定値未満となった時に室外熱交換
器１が着霜しているか或いは着霜寸前の状態にあると判
断しても良い。更に、室外熱交換器冷媒出口１ｂ近傍の
冷媒配管内の冷媒の圧力を検出し、該圧力が所定値未満
となった時に室外熱交換器１が着霜しているか或いは着
霜寸前の状態にあると判断しても良い。In the above embodiment, the heater 6 is arranged in the refrigerant pipe portion between the refrigerant outlet 1b of the outdoor heat exchanger 1 and the temperature sensitive tube 3, but the arrangement position of the heater 6 is not limited to the above. For example, it may be arranged in the refrigerant pipe section between the expansion valve 2 and the outdoor heat exchanger refrigerant inlet 1a, or in the heat exchange section between the outdoor heat exchanger refrigerant inlet 1a and the outdoor heat exchanger refrigerant outlet 1b. You may arrange. Further, in the above embodiment, frost formation is detected by detecting the fin temperature of the outdoor heat exchanger 1, but, for example, the blown air temperature of the outdoor heat exchanger 1 is detected, or the outdoor heat exchanger refrigerant outlet. It may be possible to detect the refrigerant temperatures in 1b and determine that the outdoor heat exchanger 1 is frosted or is in a state of being on the verge of frosting when these temperatures are below a predetermined value. Further, the pressure of the refrigerant in the refrigerant pipe in the vicinity of the outdoor heat exchanger refrigerant outlet 1b is detected, and when the pressure becomes less than a predetermined value, the outdoor heat exchanger 1 is in a frosting state or is in the state of being in a frosting state. You may judge that there is.
【０００９】[0009]
【効果】以上説明したごとく、本発明にあっては、ヒー
トポンプモード時に室外熱交換器の着霜が検出されると
冷媒加熱手段が作動し、冷媒温度検出手段が検出する冷
媒温度が上昇する。この結果、膨張弁の開度が増大し、
室外熱交換器内の冷媒の圧力が増大し、冷媒の蒸発温度
が上昇し、除霜される。従って、運転モードを冷房モー
ドに切り換え、或いは空気調和装置のコンプレッサを停
止することなく、ヒートポンプモードの運転を維持しつ
つ、室外熱交換器が除霜される。従って本発明により、
除霜時の室内吹出空気温度の低下を防止でき、且つ連続
したヒートポンプ運転が可能な環境条件の幅を拡大でき
るヒートポンプ式空気調和装置の室外熱交換器の除霜装
置が提供される。As described above, in the present invention, when frost formation on the outdoor heat exchanger is detected in the heat pump mode, the refrigerant heating means operates and the refrigerant temperature detected by the refrigerant temperature detecting means rises. As a result, the opening of the expansion valve increases,
The pressure of the refrigerant in the outdoor heat exchanger increases, the evaporation temperature of the refrigerant rises, and defrosting occurs. Therefore, the outdoor heat exchanger is defrosted while maintaining the operation in the heat pump mode without switching the operation mode to the cooling mode or stopping the compressor of the air conditioner. Therefore, according to the present invention,
Provided is a defrosting device for an outdoor heat exchanger of a heat pump type air conditioner, which can prevent a decrease in indoor blown air temperature during defrosting and can expand the range of environmental conditions in which continuous heat pump operation is possible.
【図１】本発明の実施例に係るヒートポンプ式空気調和
装置の室外熱交換器の除霜装置の全体構成図である。FIG. 1 is an overall configuration diagram of a defroster for an outdoor heat exchanger of a heat pump type air conditioner according to an embodiment of the present invention.
【図２】図１の除霜装置の制御系の構成図である。FIG. 2 is a configuration diagram of a control system of the defrosting device of FIG.
１ 室外熱交換機 １ａ 室外熱交換機冷媒入口 １ｂ 室外熱交換機冷媒出口 ２ 膨張弁 ３ 感温筒 ４ 配管 ５ 感温素子 ６ ヒータ ７ コントロールユニット 1 Outdoor Heat Exchanger 1a Outdoor Heat Exchanger Refrigerant Inlet 1b Outdoor Heat Exchanger Refrigerant Outlet 2 Expansion Valve 3 Temperature Sensing Cylinder 4 Piping 5 Temperature Sensing Element 6 Heater 7 Control Unit
Claims (8)
れた冷媒温度検出手段と、室外熱交換器の冷媒入口の上
流に配設され、冷媒温度検出手段が検出した冷媒温度に
応じて、冷媒温度が高い場合には開度が増大し、冷媒温
度が低い場合には開度が減少するように開閉制御される
膨張弁と、膨張弁と冷媒温度検出手段との間の冷媒配管
内にある冷媒を加熱する冷媒加熱手段と、室外熱交換器
の着霜を検出する着霜検出手段と、ヒートポンプモード
時に室外熱交換器の着霜が検出された場合に冷媒加熱手
段を作動させる加熱制御手段とを備えるヒートポンプ式
空気調和装置の室外熱交換器の除霜装置。1. A refrigerant temperature detecting means disposed downstream of a refrigerant outlet of an outdoor heat exchanger and an refrigerant upstream of a refrigerant inlet of an outdoor heat exchanger, depending on a refrigerant temperature detected by the refrigerant temperature detecting means. The expansion valve whose opening is increased when the refrigerant temperature is high and the opening is decreased when the refrigerant temperature is low, and the refrigerant pipe between the expansion valve and the refrigerant temperature detecting means. Refrigerant heating means for heating the refrigerant inside, frosting detection means for detecting frosting of the outdoor heat exchanger, and actuating the refrigerant heating means when frosting of the outdoor heat exchanger is detected during the heat pump mode A defrosting device for an outdoor heat exchanger of a heat pump type air conditioner, comprising a heating control means.
と冷媒温度検出手段の間の冷媒配管部に配設されている
請求項１に記載の除霜装置。2. The defrosting device according to claim 1, wherein the refrigerant heating means is arranged in a refrigerant pipe portion between the outdoor heat exchanger refrigerant outlet and the refrigerant temperature detecting means.
冷媒入口の間の冷媒配管部に配設されている請求項１に
記載の除霜装置。3. The defroster according to claim 1, wherein the refrigerant heating means is arranged in a refrigerant pipe portion between the expansion valve and the outdoor heat exchanger refrigerant inlet.
と室外熱交換器冷媒出口の間の熱交換部に配設されてい
る請求項１に記載の除霜装置。4. The defroster according to claim 1, wherein the refrigerant heating means is arranged in the heat exchange section between the outdoor heat exchanger refrigerant inlet and the outdoor heat exchanger refrigerant outlet.
温度を検出する手段である請求１乃至４の何れか１項に
記載の除霜装置。5. The defrosting apparatus according to claim 1, wherein the frost formation detecting means is means for detecting the fin temperature of the outdoor heat exchanger.
空気温度を検出する手段である請求１乃至４の何れか１
項に記載の除霜装置。6. The frost formation detecting means is a means for detecting the temperature of air blown from the outdoor heat exchanger.
The defrosting apparatus according to the item.
口での冷媒温度を検出する手段である請求１乃至４の何
れか１項に記載の除霜装置。7. The defrosting apparatus according to claim 1, wherein the frost formation detecting means is means for detecting the refrigerant temperature at the refrigerant outlet of the outdoor heat exchanger.
近傍の冷媒配管内の冷媒の圧力を検出する手段である請
求項１乃至４の何れか１項に記載の除霜装置。8. The defrosting apparatus according to claim 1, wherein the frost formation detecting means is a means for detecting the pressure of the refrigerant in the refrigerant pipe near the outlet of the outdoor heat exchanger refrigerant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4351124A JPH06174345A (en) | 1992-12-07 | 1992-12-07 | Defrosting device for outdoor heat exchanger for heat pump type air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4351124A JPH06174345A (en) | 1992-12-07 | 1992-12-07 | Defrosting device for outdoor heat exchanger for heat pump type air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06174345A true JPH06174345A (en) | 1994-06-24 |
Family
ID=18415215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4351124A Pending JPH06174345A (en) | 1992-12-07 | 1992-12-07 | Defrosting device for outdoor heat exchanger for heat pump type air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06174345A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100525420B1 (en) * | 2003-07-07 | 2005-11-02 | 엘지전자 주식회사 | method for controlling defrosting in heat pump |
| CN106352599A (en) * | 2016-09-22 | 2017-01-25 | 芜湖美智空调设备有限公司 | Defrosting control method, defrosting control device and heat pump type air conditioner |
| CN110160291A (en) * | 2018-02-06 | 2019-08-23 | 中山深宝电器制造有限公司 | A kind of low temperature heating machine defrosting control program |
| CN110260466A (en) * | 2019-06-13 | 2019-09-20 | 珠海格力电器股份有限公司 | air conditioner defrosting control method and device |
| JP2020204447A (en) * | 2019-06-19 | 2020-12-24 | 富士電機株式会社 | Cooling device |
-
1992
- 1992-12-07 JP JP4351124A patent/JPH06174345A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100525420B1 (en) * | 2003-07-07 | 2005-11-02 | 엘지전자 주식회사 | method for controlling defrosting in heat pump |
| CN106352599A (en) * | 2016-09-22 | 2017-01-25 | 芜湖美智空调设备有限公司 | Defrosting control method, defrosting control device and heat pump type air conditioner |
| CN110160291A (en) * | 2018-02-06 | 2019-08-23 | 中山深宝电器制造有限公司 | A kind of low temperature heating machine defrosting control program |
| CN110160291B (en) * | 2018-02-06 | 2021-04-13 | 中山深宝电器制造有限公司 | Defrosting control scheme for low-temperature heating machine |
| CN110260466A (en) * | 2019-06-13 | 2019-09-20 | 珠海格力电器股份有限公司 | air conditioner defrosting control method and device |
| CN110260466B (en) * | 2019-06-13 | 2021-01-05 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device |
| JP2020204447A (en) * | 2019-06-19 | 2020-12-24 | 富士電機株式会社 | Cooling device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106016628B (en) | Defrosting control method and device for air conditioner | |
| JPS609221B2 (en) | Control device for monitoring and controlling the operation of vapor compression refrigeration equipment and its frost detection method | |
| JP2008121983A (en) | Air conditioner | |
| US4905894A (en) | Refrigerant heating type air conditioner | |
| US3280579A (en) | Heat pump defrost control unit | |
| JPH06174345A (en) | Defrosting device for outdoor heat exchanger for heat pump type air conditioner | |
| KR100652775B1 (en) | Refrigerator and defrost time decision method thereof | |
| JP2007051839A (en) | Air conditioning unit | |
| JP2964705B2 (en) | Air conditioner | |
| JP2004251567A (en) | Air conditioner | |
| KR20000073050A (en) | Low pressure side obstruction deciding method for air conditioner | |
| JP3546102B2 (en) | Engine driven air conditioner | |
| KR101105764B1 (en) | Iudoor fan hot control apparatus of air conditioner and control method of the same | |
| JP3381753B2 (en) | Air conditioning system | |
| JPH06213541A (en) | Heating-and-cooling machine | |
| JPH06337185A (en) | Preventing and controlling device for frosting in air-conditioning machine | |
| KR950033308A (en) | Refrigerant Heating Air Conditioning Unit | |
| JPS61184350A (en) | Defrost method for air conditioner | |
| JP3310712B2 (en) | Water-cooled air conditioner | |
| KR0144197B1 (en) | Uniform heat exchanger device and control method of aircon. evaporator | |
| KR100388124B1 (en) | Icing prevention apparatus of heat exchanger | |
| JPS63129237A (en) | Air conditioner of heat pump type | |
| JPH06180165A (en) | Heating and cooling machine | |
| JPH05322333A (en) | Heating or cooling device | |
| JPH05113252A (en) | Refrigerating cycle |