JPH08291957A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH08291957A JPH08291957A JP7095695A JP9569595A JPH08291957A JP H08291957 A JPH08291957 A JP H08291957A JP 7095695 A JP7095695 A JP 7095695A JP 9569595 A JP9569595 A JP 9569595A JP H08291957 A JPH08291957 A JP H08291957A
- Authority
- JP
- Japan
- Prior art keywords
- ice protection
- temperature
- heat exchanger
- protection operation
- air conditioner
- 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】本発明は空気調和機に係わり、詳
しくは、冷房運転時の結氷保護動作に伴う室内の温度変
化をより少なくするための手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to a means for reducing a temperature change in a room due to an ice protection operation during a cooling operation.
【０００２】[0002]
【従来の技術】空気調和機においては冷房運転中の室内
熱交換器温度が結氷保護動作開始温度（例えば、３℃未
満）まで降下すると圧縮機および室外送風機の運転を停
止し、結氷保護動作解除温度（例えば、７℃以上）まで
上昇すると圧縮機および室外送風機の運転を再開する結
氷保護動作機能を備えている。室内熱交換器の温度は同
室内熱交換器に設けられた温度検出手段により検出さ
れ、その検出値が予め設定されている結氷保護動作開始
温度まで降下すると室内機制御部は室外機制御部に対
し、圧縮機および室外送風機の運転を停止するよう指令
し、室内熱交換器の温度が結氷保護動作解除温度まで上
昇すると圧縮機および室外送風機の運転を再開するよう
指令するようになっている。2. Description of the Related Art In an air conditioner, when the temperature of an indoor heat exchanger during a cooling operation falls to a freezing protection operation start temperature (for example, less than 3 ° C.), the operation of a compressor and an outdoor blower is stopped and the freezing protection operation is canceled. It has an ice protection operation function that restarts the operation of the compressor and the outdoor blower when the temperature rises (for example, 7 ° C or higher). The temperature of the indoor heat exchanger is detected by a temperature detecting means provided in the indoor heat exchanger, and when the detected value falls to a preset freezing protection operation start temperature, the indoor unit control unit becomes an outdoor unit control unit. On the other hand, the instruction is given to stop the operation of the compressor and the outdoor blower, and the operation of the compressor and the outdoor blower is restarted when the temperature of the indoor heat exchanger rises to the defrost protection operation release temperature.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述の
ような結氷保護動作機能を有する空気調和機では気象条
件などによって結氷保護動作が頻繁に繰り返され、その
影響で室内の温度変化が大きくなり、快適性が損なわれ
てしまうことになる。したがって、本発明においては、
室内熱交換器の結氷を抑制しながら結氷保護動作の回数
を減らすようにした空気調和機を提供することを目的と
している。However, in the air conditioner having the above-mentioned ice protection operation function, the ice protection operation is frequently repeated due to weather conditions, etc., and the temperature change in the room becomes large due to the effect of the operation. The sex will be impaired. Therefore, in the present invention,
An object of the present invention is to provide an air conditioner in which the number of ice protection operations is reduced while suppressing the formation of ice in the indoor heat exchanger.
【０００４】[0004]
【課題を解決するための手段】本発明は上記の課題を解
決するためになされたものであり、冷房運転中の室内熱
交換器温度が結氷保護動作開始温度まで降下すると圧縮
機および室外送風機の運転を停止し、結氷保護動作解除
温度まで上昇すると圧縮機および室外送風機の運転を再
開する結氷保護動作機能を備えてなる空気調和機におい
て、前記結氷保護動作機能が所定時間内に所定回数動作
した場合、結氷保護動作が解除されてから所定時間が経
過するまで、前記室外送風機を減速運転し、室外熱交換
器の熱交換量を低下させるようにした。The present invention has been made to solve the above problems, and when the temperature of the indoor heat exchanger during the cooling operation drops to the start temperature of the ice protection operation, the compressor and the outdoor blower are In an air conditioner having an ice protection operation function that stops the operation and restarts the operation of the compressor and the outdoor blower when the temperature rises to the ice protection operation release temperature, the ice protection operation function operates a predetermined number of times within a predetermined time. In this case, the outdoor blower is decelerated until the predetermined time elapses after the ice protection operation is released, and the heat exchange amount of the outdoor heat exchanger is reduced.
【０００５】[0005]
【作用】上記の手段によれば、結氷保護動作機能が所定
時間内に所定回数動作した場合、結氷保護動作が解除さ
れてから所定時間が経過するまで、室外送風機の回転数
を減らして室外熱交換器の熱交換量を低下させるように
なっているので、室内熱交換器の温度が下がり過ぎるの
を抑えることができ、その結果として、結氷保護動作機
能の動作回数を減らすことができるので、室内の温度変
化をより小さくすることができる。According to the above means, when the ice protection operation function is operated a predetermined number of times within a predetermined time, the number of rotations of the outdoor blower is reduced until the predetermined time elapses after the ice protection operation is released, thereby reducing the outdoor heat. Since the amount of heat exchange of the exchanger is reduced, it is possible to suppress the temperature of the indoor heat exchanger from dropping too much, and as a result, it is possible to reduce the number of times the ice protection operation function operates. The temperature change in the room can be made smaller.
【０００６】[0006]
【実施例】以下、本発明の一実施例を図１〜図３に基づ
いて説明する。図１は空気調和機の基本的な冷凍サイク
ルとその制御系の概略を表したもので、１は圧縮機、２
は運転モードに対応させて冷媒の流れを切り換える四方
弁、３は室外熱交換器、４はキャピラリーチューブ等を
用いた絞り手段、５は室内熱交換器で、冷房運転時の冷
媒は１，２，３，４，５の順に流れ、再度、四方弁２を
経由して圧縮機１に戻るようになっている。室外熱交換
器３は室外機制御部６で制御される室外送風機７により
空冷され、室内熱交換器５で熱交換された空気は室内機
制御部８で制御される室内送風機９によって室内へ送出
されるようになっており、室内機制御部８と室外機制御
部６間は信号線１０で結ばれている。また、圧縮機１の
吐出側配管には高圧圧力を検出する圧力センサ１１が、
室内熱交換器３の中央部には同室内熱交換器３の温度
（凝縮温度）を検出する温度センサ１２がそれぞれ設け
られている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Fig. 1 shows the outline of a basic refrigeration cycle of an air conditioner and its control system.
Is a four-way valve for switching the flow of the refrigerant in accordance with the operation mode, 3 is an outdoor heat exchanger, 4 is a throttle means using a capillary tube or the like, 5 is an indoor heat exchanger, and the refrigerant during cooling operation is 1, 2 , 3, 4, 5 in this order, and then returns to the compressor 1 via the four-way valve 2 again. The outdoor heat exchanger 3 is air-cooled by the outdoor blower 7 controlled by the outdoor unit controller 6, and the air that has been heat-exchanged by the indoor heat exchanger 5 is sent indoors by the indoor blower 9 controlled by the indoor unit controller 8. The indoor unit controller 8 and the outdoor unit controller 6 are connected by a signal line 10. Further, a pressure sensor 11 for detecting high pressure is provided in the discharge side pipe of the compressor 1.
A temperature sensor 12 for detecting the temperature (condensing temperature) of the indoor heat exchanger 3 is provided at the center of the indoor heat exchanger 3.
【０００７】室内機制御部８および室外機制御部６には
それぞれ図示はされてないが、温度情報等のアナログ信
号をデジタル変換するＡ／Ｄ変換部の他、タイマー部、
記憶部、比較部などがあり、圧力センサ１１により検出
される高圧圧力、図示されてない温度センサにより検出
される室外熱交換器３の冷房運転時の入口温度および外
気温度等に関する情報は室外機制御部６側のＡ／Ｄ変換
部に入力され、一方、室内機制御部８側のＡ／Ｄ変換部
には温度センサ１２により検出される室内熱交換器３の
温度、図示されてない温度センサにより検出される室内
温度等に関する情報が入力されるようになっている。な
お、上述の記憶部には冷房運転時の室内熱交換器５の結
氷保護の判定基準となる結氷保護動作開始温度および結
氷保護動作解除温度が記憶されている。Although not shown respectively in the indoor unit control section 8 and the outdoor unit control section 6, in addition to an A / D conversion section for digitally converting an analog signal such as temperature information, a timer section,
The outdoor unit includes a storage unit, a comparison unit, and the like, and information about the high-pressure pressure detected by the pressure sensor 11, the inlet temperature during the cooling operation of the outdoor heat exchanger 3 detected by a temperature sensor (not shown), the outdoor air temperature, and the like. The temperature of the indoor heat exchanger 3, which is input to the A / D conversion unit on the control unit 6 side and is detected by the temperature sensor 12 on the A / D conversion unit on the indoor unit control unit 8 side, a temperature not shown Information about the room temperature and the like detected by the sensor is input. The above-mentioned storage unit stores the ice-freezing protection operation start temperature and the ice-freezing protection operation release temperature, which are the criteria for determining the freezing protection of the indoor heat exchanger 5 during the cooling operation.
【０００８】ところで、冷房運転では室内熱交換器５の
温度が予め設定された結氷保護動作開始温度まで降下す
ると圧縮機１および室外送風機７の運転を停止し、その
後、室内熱交換器５の温度が結氷保護動作解除温度まで
上昇すると圧縮機１および室外送風機７の運転を再開さ
せるという結氷保護動作を繰り返すことにより室内熱交
換器５の結氷を防止するようになっているが、特に本実
施例では、図２に示すように結氷保護動作が所定時間内
に所定回数、例えば７０分内に５回動作した場合、５回
目の結氷保護動作が解除されてから冷房運転が再開され
た後、所定時間例えば３０分が経過するまで室外送風機
７を低速運転し、室外熱交換器３の熱交換量を低下させ
ることにより、結氷保護が頻繁に動作するのを避け、室
内の温度変化をより少なくするようになっている。By the way, in the cooling operation, when the temperature of the indoor heat exchanger 5 drops to a preset start temperature of the ice protection operation, the operation of the compressor 1 and the outdoor blower 7 is stopped, and then the temperature of the indoor heat exchanger 5 is stopped. When the temperature rises to the ice-freezing protection release temperature, the operation of the compressor 1 and the outdoor blower 7 is restarted to prevent the indoor heat exchanger 5 from freezing by repeating the ice-freezing operation. Then, as shown in FIG. 2, when the ice protection operation is performed a predetermined number of times within a predetermined time, for example, five times within 70 minutes, after the fifth ice protection operation is released, the cooling operation is restarted, and then the predetermined operation is performed. By operating the outdoor blower 7 at a low speed until the time elapses, for example, 30 minutes, and reducing the heat exchange amount of the outdoor heat exchanger 3, it is possible to avoid frequent activation of the ice protection and to prevent changes in the indoor temperature. It is made so as to reduce to.
【０００９】図３は上述の結氷保護動作の一例をフロー
チャートで表したもので、冷房運転が開始されると、ス
テップＳＴ１では結氷保護の動作をカウントするカウン
ターと、結氷保護の一回目の動作で始動する７０分タイ
マーと、室外送風機７の低速運転時間を計測する３０分
タイマーがそれぞれリセットされる。ステップＳＴ２で
は結氷保護が動作したかどうかを判定し、結氷保護が動
作した場合にはステップＳＴ３で圧縮機１および室外送
風機７を停止し、ステップＳＴ４で結氷保護の動作回数
をカウントするカウンターの値をプラス（＋１）する。
ステップＳＴ５では結氷保護動作のカウント数が１にな
ったと判定すると次のステップＳＴ６で７０分タイマー
をスタートさせる。FIG. 3 is a flowchart showing an example of the above-mentioned ice protection operation. When the cooling operation is started, in step ST1, a counter for counting the operation of the ice protection and a first operation of the ice protection are performed. The 70-minute timer that starts and the 30-minute timer that measures the low-speed operation time of the outdoor blower 7 are reset. In step ST2, it is determined whether or not the ice protection has operated. If the ice protection has operated, the compressor 1 and the outdoor blower 7 are stopped in step ST3, and the value of the counter that counts the number of times of ice protection operation in step ST4. Is added (+1).
If it is determined in step ST5 that the count of the ice protection operation has reached 1, the 70-minute timer is started in step ST6.
【００１０】ステップＳＴ７では結氷保護動作のカウン
ト数が５になったかどうかを判定し、５未満であればス
テップＳＴ８で結氷保護が解除されたかどうかを判定
し、解除されていればステップＳＴ９で圧縮機１をＯＮ
するとともに室外送風機７を高速で運転再開し、ステッ
プＳＴ２〜ステップＳＴ９の作業を繰り返すが、ステッ
プＳＴ７で結氷保護動作のカウント数が５になったと判
定されるとステップＳＴ１０で７０分タイマーがタイム
アップしたかどうか判定される。これは結氷保護動作が
７０分以内に５回繰り返されたかどうかを判断するため
の作業で、もし、ステップＳＴ１０における判定で７０
分タイマーがすでにタイムアップしていたらステップＳ
Ｔ１１で結氷保護が解除されるのを待ち、結氷保護が解
除されたらステップＳＴ１２で圧縮機１をＯＮするとと
もに室外送風機７を高速で運転再開する。In step ST7, it is determined whether or not the number of ice-freezing protection counts has reached 5. If it is less than 5, it is determined in step ST8 whether or not ice-freezing protection has been released. If yes, compression is performed in step ST9. Turn on machine 1
At the same time, the outdoor blower 7 is restarted at a high speed, and the work of steps ST2 to ST9 is repeated. However, if it is determined in step ST7 that the count of ice protection operation has reached 5, the 70-minute timer is timed out in step ST10. It is determined whether or not. This is a work for judging whether or not the ice protection operation has been repeated 5 times within 70 minutes, and if it is 70 in the judgment in step ST10.
If the minute timer is already up, step S
Waiting for the ice protection to be released at T11, when the ice protection is released, the compressor 1 is turned on and the outdoor blower 7 is restarted at high speed in step ST12.
【００１１】一方、結氷保護動作が７０分以内に５回繰
り返された場合にはステップＳＴ１３で結氷保護が解除
されるのを待ち、結氷保護が解除されたらステップＳＴ
１４で圧縮機１をＯＮするとともに室外送風機７を低速
で運転再開する。ステップＳＴ１５では結氷保護が動作
したかどうかを判定し、動作していればステップＳＴ１
６で結氷保護動作をカウントするカウンターと、７０分
タイマーと、３０分タイマーをそれぞれリセットしてス
テップＳＴ３に戻すことになるが、結氷保護が動作して
なかった場合にはステップＳＴ１７で３０分タイマーを
スタートさせ、ステップＳＴ１８で３０分タイマーがタ
イムアップしたと判定されるまで室外送風機７の低速運
転を行い、ステップＳＴ１９で室外送風機７を高速運転
に切換えるようにしている。このような作業を行えば冷
凍サイクルに悪影響を及ぼすことなく結氷保護の動作回
数を減らすことができる。On the other hand, if the ice protection operation is repeated five times within 70 minutes, the operation waits until the ice protection is released in step ST13, and if the ice protection is released, step ST
At 14, the compressor 1 is turned on and the outdoor blower 7 is restarted at a low speed. In step ST15, it is determined whether or not the ice protection is activated, and if it is activated, step ST1.
In step 6, the counter that counts the ice protection operation, the 70-minute timer, and the 30-minute timer are reset and returned to step ST3. However, if the ice protection is not operating, the 30-minute timer is started in step ST17. The outdoor blower 7 is operated at a low speed until it is determined in step ST18 that the 30-minute timer has timed out, and the outdoor blower 7 is switched to the high speed operation in step ST19. By performing such work, it is possible to reduce the number of operations of ice protection without adversely affecting the refrigeration cycle.
【００１２】[0012]
【発明の効果】以上説明したような制御機能を備えた空
気調和機であるならば、結氷保護が頻繁に行われるよう
な条件下でも、その結氷保護の動作回数を冷凍サイクル
に何ら悪影響を及ぼすことなく減らせるので、室内の温
度変化もより少なくなり、冷房運転における快適性が向
上する。With the air conditioner having the control function as described above, the number of times the ice protection operation is performed adversely affects the refrigeration cycle even under conditions where the ice protection is frequently performed. As a result, the temperature change in the room is reduced and the comfort in the cooling operation is improved.
【図１】本発明に係わる空気調和機の冷凍サイクルとそ
の制御系の概略図である。FIG. 1 is a schematic diagram of a refrigeration cycle of an air conditioner according to the present invention and its control system.
【図２】本発明に基づく結氷保護動作例を表すタイムチ
ャートである。FIG. 2 is a time chart showing an example of an ice protection operation according to the present invention.
【図３】本発明の結氷保護動作例を表すフローチャート
である。FIG. 3 is a flowchart showing an example of an ice protection operation of the present invention.
１ 圧縮機 ２ 四方弁 ３ 室外熱交換器 ４ 絞り手段 ５ 室内熱交換器 ６ 室外機制御部 ７ 室外送風機 ８ 室内機制御部 ９ 室内送風機 １０ 信号線 １１ 圧力センサ １２ 温度センサ 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Throttle means 5 Indoor heat exchanger 6 Outdoor unit control unit 7 Outdoor blower 8 Indoor unit control unit 9 Indoor blower 10 Signal line 11 Pressure sensor 12 Temperature sensor
Claims (4)
護動作開始温度まで降下すると圧縮機および室外送風機
の運転を停止し、結氷保護動作解除温度まで上昇すると
圧縮機および室外送風機の運転を再開する結氷保護動作
機能を備えてなる空気調和機において、前記結氷保護動
作機能が所定時間内に所定回数動作した場合、結氷保護
動作が解除されてから所定時間が経過するまで、前記室
外送風機を減速運転し、室外熱交換器の熱交換量を低下
させるようにしてなることを特徴とする空気調和機。1. The operation of the compressor and the outdoor blower is stopped when the temperature of the indoor heat exchanger during the cooling operation is lowered to the ice protection operation start temperature, and the operation of the compressor and the outdoor blower is stopped when the temperature is raised to the ice protection operation release temperature. In an air conditioner having an ice protection operation function for restarting, when the ice protection operation function operates a predetermined number of times within a predetermined time, the outdoor blower is operated until a predetermined time elapses after the ice protection operation is released. An air conditioner characterized by being operated at a reduced speed to reduce the amount of heat exchange of an outdoor heat exchanger.
速と低速に切換可能にしてなる請求項１記載の空気調和
機。2. The air conditioner according to claim 1, wherein the number of revolutions of the outdoor blower can be switched at least between high speed and low speed.
護動作開始から所定時間を計測するタイマーと、前記結
氷保護動作機能の動作回数をカウントするカウンターと
を備え、同カウンターによりカウントされた結氷保護動
作機能の動作回数が前記所定時間内に所定回数に達しな
かった場合、前記カウンターをリセットするようにして
なる請求項１記載の空気調和機。3. The ice protection provided with a timer for measuring a predetermined time from the start of the first protection operation by the ice protection operation function, and a counter for counting the number of times of operation of the ice protection operation function. The air conditioner according to claim 1, wherein the counter is reset when the number of times of operation of the operation function does not reach the predetermined number within the predetermined time.
き、前記室内熱交換器温度が結氷保護動作開始温度まで
降下したら、前記室外送風機の運転を停止するようにし
てなる請求項１記載の空気調和機。4. The air according to claim 1, wherein, when the outdoor blower is operating at a low speed, the operation of the outdoor blower is stopped when the temperature of the indoor heat exchanger drops to a start temperature of ice protection operation. Harmony machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7095695A JPH08291957A (en) | 1995-04-20 | 1995-04-20 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7095695A JPH08291957A (en) | 1995-04-20 | 1995-04-20 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08291957A true JPH08291957A (en) | 1996-11-05 |
Family
ID=14144641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7095695A Pending JPH08291957A (en) | 1995-04-20 | 1995-04-20 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08291957A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748465A (en) * | 2013-12-27 | 2015-07-01 | 广东美的制冷设备有限公司 | Air conditioner defrosting control method, air conditioner defrosting control device and air conditioner |
| CN106369750A (en) * | 2016-09-08 | 2017-02-01 | 广东美的暖通设备有限公司 | Defrosting control method and defrosting control device of air conditioner and air conditioner |
| CN108317667A (en) * | 2018-01-22 | 2018-07-24 | 青岛海尔空调器有限总公司 | A kind of air-conditioning internal machine freezing detection method and device |
| CN108775741A (en) * | 2018-05-24 | 2018-11-09 | 青岛海尔空调器有限总公司 | Air conditioner defrosting control method |
| CN110017583A (en) * | 2019-03-12 | 2019-07-16 | 青岛海尔空调电子有限公司 | Air conditioner and its defrosting control method |
| CN110030705A (en) * | 2019-04-01 | 2019-07-19 | 广东美的暖通设备有限公司 | The control method of multi-line system |
| CN110836444A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for fixed-frequency air conditioner |
-
1995
- 1995-04-20 JP JP7095695A patent/JPH08291957A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748465A (en) * | 2013-12-27 | 2015-07-01 | 广东美的制冷设备有限公司 | Air conditioner defrosting control method, air conditioner defrosting control device and air conditioner |
| CN106369750A (en) * | 2016-09-08 | 2017-02-01 | 广东美的暖通设备有限公司 | Defrosting control method and defrosting control device of air conditioner and air conditioner |
| CN108317667A (en) * | 2018-01-22 | 2018-07-24 | 青岛海尔空调器有限总公司 | A kind of air-conditioning internal machine freezing detection method and device |
| CN108317667B (en) * | 2018-01-22 | 2020-12-29 | 青岛海尔空调器有限总公司 | Method and device for detecting icing of air conditioner indoor unit |
| CN108775741A (en) * | 2018-05-24 | 2018-11-09 | 青岛海尔空调器有限总公司 | Air conditioner defrosting control method |
| CN108775741B (en) * | 2018-05-24 | 2020-09-25 | 青岛海尔空调器有限总公司 | Defrosting control method for air conditioner |
| CN110836444A (en) * | 2018-08-17 | 2020-02-25 | 青岛海尔空调器有限总公司 | Defrosting control method for fixed-frequency air conditioner |
| CN110017583A (en) * | 2019-03-12 | 2019-07-16 | 青岛海尔空调电子有限公司 | Air conditioner and its defrosting control method |
| CN110030705A (en) * | 2019-04-01 | 2019-07-19 | 广东美的暖通设备有限公司 | The control method of multi-line system |
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