JPS6115058A - Method of controlling opening of electrically-operated type expansion valve - Google Patents
Method of controlling opening of electrically-operated type expansion valveInfo
- Publication number
- JPS6115058A JPS6115058A JP13330684A JP13330684A JPS6115058A JP S6115058 A JPS6115058 A JP S6115058A JP 13330684 A JP13330684 A JP 13330684A JP 13330684 A JP13330684 A JP 13330684A JP S6115058 A JPS6115058 A JP S6115058A
- Authority
- JP
- Japan
- Prior art keywords
- expansion valve
- valve
- compressor
- opening
- electric expansion
- 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
- Temperature-Responsive Valves (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は冷凍サイクルに組み込まれる電動式膨張弁の開
度制御方法に関し、特に電動式膨張弁の弁本体部を取り
替える際にそのモータ部側との接続を容易に行える電動
式膨張弁の開度制御方法に関するものである。Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a method for controlling the opening of an electric expansion valve incorporated in a refrigeration cycle, and in particular, when replacing the valve body of an electric expansion valve, The present invention relates to a method for controlling the opening degree of an electric expansion valve, which allows easy connection.
［発明の技術的費用とその問題点］
従来、冷凍゛す゛イクルの減圧装置としてパルスモータ
駆動方式の電動式膨張弁が使用され、冷凍サイクルの負
荷に応じてその電動式膨張弁の弁開度が制御される。[Technical cost of the invention and its problems] Conventionally, a pulse motor-driven electric expansion valve has been used as a pressure reducing device for a refrigeration cycle, and the opening degree of the electric expansion valve has been changed depending on the load of the refrigeration cycle. is controlled.
このパルスモータ駆動方式の電動式膨張弁Ｖを第６図に
より説明づる。第６図において電動式膨張弁Ｖはモータ
部１と、そのモータ部１と接ｙｔする弁本体部２とから
構成される。弁本体部２は、出入ロバイブ３．４を備え
た弁筒５と、その弁筒５内に形成された弁座６と、弁８
６に着座する弁体７と、その弁体７を弁座６に着座させ
るバルブステム８と、イのパル１ステム８を弁筒５の上
部に支持するベローズ９と、バルブステム８の上部に設
けられたブツシュ１０とからなる。モータ部１はケース
１１内に設けられたパルスモータ１２と、そのパルスモ
ータ１２にギヤボックス１３を介して接続されたシ１１
フト１４と、ケース１１の下部の簡１５に螺入され、パ
ルスモータ１２の回転で上下するドライブシャフト１６
とからなり、このドライブシャフト１６が弁本体部２の
プツシ１１０と当接し、ドライブシＶフｉ・１６の上下
位置により弁体７と弁座６との開度が調整される。This electric expansion valve V driven by a pulse motor will be explained with reference to FIG. In FIG. 6, the electric expansion valve V is composed of a motor section 1 and a valve body section 2 that is in contact with the motor section 1. The valve body 2 includes a valve cylinder 5 having an in/out lobe 3.4, a valve seat 6 formed in the valve cylinder 5, and a valve 8.
6, a valve stem 8 that seats the valve body 7 on the valve seat 6, a bellows 9 that supports the pulse 1 stem 8 on the upper part of the valve cylinder 5, and a valve stem 8 on the upper part of the valve stem 8. It consists of a bushing 10 provided. The motor section 1 includes a pulse motor 12 provided in a case 11 and a shaft 11 connected to the pulse motor 12 via a gear box 13.
A drive shaft 16 is screwed into the foot 14 and the shaft 15 at the bottom of the case 11, and is moved up and down by the rotation of the pulse motor 12.
The drive shaft 16 comes into contact with the pusher 110 of the valve body 2, and the opening degree of the valve body 7 and the valve seat 6 is adjusted by the vertical position of the drive shaft V16.
この弁本体部２とモータ部１との接続は弁本体部２の弁
筒５の上端のねじ部１７に、モータ部１の筒１５に回転
自在に設けたロックリング１８を螺合することで取り付
けられる。この電動式膨張弁Ｖの制御は第７図に示すよ
うに運転開始時に弁を全閉信号にて全開とし、そこを開
度のλｔｉＩとしたのち、初期開度に開き、イの後０伺
に応じ（その開度を段階的に小さくし或は大きくしたり
して開度制御を行っている。The connection between the valve body part 2 and the motor part 1 is achieved by screwing a lock ring 18 rotatably provided on the cylinder 15 of the motor part 1 into the screw part 17 at the upper end of the valve cylinder 5 of the valve body part 2. It is attached. As shown in Fig. 7, the electric expansion valve V is controlled by fully opening the valve with a full close signal at the start of operation, setting it to the opening degree λtiI, and then opening it to the initial opening degree. The opening degree is controlled by decreasing or increasing the opening degree in stages.
一方、この電動式膨張弁Ｖは例えば弁本体部２が故障し
た場合などその弁本体部２をロックリング１８を弁筒５
から外して取り替えられるようにサービス性、製造性に
配慮がなされている。On the other hand, when this electric expansion valve V is used, for example, when the valve body 2 breaks down, the lock ring 18 is attached to the valve cylinder 5.
Consideration has been given to serviceability and manufacturability so that it can be removed and replaced.
しかしながら弁体７の全開から全開の弁リフト距離はわ
ずか０．５１１ｍであり、もし弁本体部２に故障が生じ
冷凍サイクルを停止したとし、また弁開度が第７図に示
したように１ （約０．１． ）であるとすると、モー
タ部１のドライブシャフト１６はその弁開度ρを維持づ
る位置で止まる。この場合、弁体７．バルブステム８及
びブツシュ１０はそのρ （約０．１． ）以下の距離
しか移動できないこととなる。この状態では、モータ部
１のドライブシャフト１６により弁体７等は全閉までわ
ずか０１馴以下しか余裕がない。一方、ブツシュ１０．
バルブステム８及び弁体７の組立や弁筒５に弁座６を圧
入取り付けるなどの作業により生じるバラツキは最大０
．４ａｍ程度ある。従って、上記状態で弁本体部２を交
換して組立だ場合、弁本体部２のロックリング１８を締
め付けていくと弁体７が弁座６に当って全開となっても
、未だ締め付はシロがあり、それ以上締め付けるとドラ
イブシャフト１６のねじ部分に過剰な力が加わりそのね
じ部が破損してしまう問題があった。However, the valve lift distance from fully open to fully open of the valve body 7 is only 0.511 m, and if a failure occurs in the valve body 2 and the refrigeration cycle is stopped, and the valve opening is 1 as shown in FIG. (approximately 0.1.), the drive shaft 16 of the motor section 1 stops at a position where the valve opening degree ρ is maintained. In this case, the valve body 7. The valve stem 8 and bushing 10 can only move a distance less than ρ (approximately 0.1.). In this state, the valve body 7 etc. are fully closed by the drive shaft 16 of the motor section 1, leaving only a margin of less than 01 mm. On the other hand, Bush 10.
Variations caused by operations such as assembling the valve stem 8 and valve body 7 and press-fitting the valve seat 6 into the valve cylinder 5 are reduced to a maximum of 0.
．． It's about 4am. Therefore, when replacing and assembling the valve body 2 in the above state, as the lock ring 18 of the valve body 2 is tightened, the valve body 7 will hit the valve seat 6 and be fully opened, but it will still not be tightened. There is a margin, and if the screw is tightened any further, excessive force will be applied to the threaded portion of the drive shaft 16, resulting in damage to the threaded portion.
この改善策として第８図に示すように運転開始後、一定
時間弁開度を全開とするとし、その全開中に運転を停止
し、その弁本体部２を取り替えるようにすればモータ部
１のドライブシャフト１６は全開位置まで上がっている
ため、弁体７の上下リフト距離は０．５ａｓ＋あり、取
り替える弁本体部２の精度にバラツキがあっても上述の
ようにドライブシャフト１６のねじ部などが破損するよ
うな問題は生じない。As a countermeasure to this problem, as shown in Fig. 8, after the start of operation, the valve opening degree is kept fully open for a certain period of time, and the operation is stopped during that fully open period, and the valve body 2 is replaced. Since the drive shaft 16 has been raised to the fully open position, the vertical lift distance of the valve body 7 is 0.5 as+, and even if there is variation in the accuracy of the valve body 2 to be replaced, the threaded portion of the drive shaft 16 etc. There are no problems with damage.
しかしながら、運転中一定時間全開状態に維持すること
は圧縮機に過度の液冷媒が戻ってくることとなり、圧縮
機が破損する原因となりやづい。However, maintaining the fully open state for a certain period of time during operation causes excessive liquid refrigerant to return to the compressor, which is likely to cause damage to the compressor.
特に最近はインバータによる回転数す変の圧縮機が多く
採用されており、このような回転数可変の圧縮機では運
転開始時に高速で回転づることが多いため、液冷媒の戻
りが過瓜に多くなり圧縮機の信頼性を大巾に低下させる
問題があった。Especially recently, many compressors with variable rotation speed using inverters have been adopted, and since such compressors with variable rotation speed often rotate at high speed at the start of operation, there is a large amount of liquid refrigerant returning. However, there was a problem that significantly reduced the reliability of the compressor.
［発明の目的］
本発明は上記事情を考慮してなされたもので、電動式膨
張弁の弁本体部を取り替えるにおいて、その弁本体部の
精度にバラツキがあっても、何ら支障なく弁本体部の取
り替えができる電動式膨張弁の弁開度制御方法を提供す
ることを目的とする。[Object of the Invention] The present invention has been made in consideration of the above circumstances, and when replacing the valve body of an electric expansion valve, even if there is variation in the accuracy of the valve body, the valve body can be replaced without any problem. An object of the present invention is to provide a valve opening control method for an electrically operated expansion valve that can be replaced.
［発明の概要］ 本発明は上記の目的を達成するために圧縮機。[Summary of the invention] The present invention provides a compressor to achieve the above objects.
凝縮器、パルスモータによって開度調整される電動式膨
張弁、蒸発器とを順次連結してなる冷凍サイクルにおい
て、上記電動式膨張弁の開度を制御するに際して、運転
スイッチを投入したときに全開信号により上記電動式膨
張弁を全閉させて開度基準を設定し、爾後初期開度まで
開いたときに上記圧縮機が停止されている場合には電動
式膨張弁を全開させることを特徴とづるもので、電動式
膨張弁の運転開始後の開度を圧縮機が運転している場合
には設定した初期開度に保ち、圧縮機が停止している場
合には全開とすることにより、圧縮機運転時には冷凍リ
イクルの負荷に応じた弁開度に維持でき、過度の液戻り
を防止すると共に圧縮機の停止時にはその弁本体部の取
替えが支障なく行えるようにしたものである。In a refrigeration cycle that sequentially connects a condenser, an electric expansion valve whose opening is adjusted by a pulse motor, and an evaporator, when controlling the opening of the electric expansion valve, the opening is fully opened when the operation switch is turned on. The electrically operated expansion valve is fully closed in response to a signal, an opening standard is set, and then when the compressor is stopped when the opening is opened to an initial opening, the electrically operated expansion valve is fully opened. By keeping the opening of the electric expansion valve at the set initial opening after the start of operation when the compressor is operating, and fully opening when the compressor is stopped, During compressor operation, the valve opening degree can be maintained in accordance with the load of the refrigerating recycle, preventing excessive liquid return, and when the compressor is stopped, the valve body can be replaced without any trouble.
［発明の実施例］
以下本発明の電動式膨張弁の開度制御方法の好適一実施
例を添イ（図面に基づいて説明する。[Embodiments of the Invention] A preferred embodiment of the method for controlling the opening of an electric expansion valve according to the present invention will be described below with reference to the drawings.
第１図は電動式膨張弁の開度制御方法を示すフローチャ
ートを示すもので、先ず運転スイッチが投入１９された
場合、第６図に示した電動式膨張弁■を全開２０とする
。次にこの全開２０の信号により初期開度２１が設定さ
れる。次に、後述づる冷凍サイクルの圧縮機の運転状態
２２が運転中か停止中かを判断し、圧縮機が運転中であ
れば、第２図にａで示すように電動式膨張弁Ｖの初期開
度２１からその冷凍サイクルの負荷に応じた開度維持２
３を保つよう制御する。また圧縮機が停止ｌ：中であれ
ば第２図にｂで示すように弁開度を全開２４とする。FIG. 1 shows a flowchart showing a method for controlling the opening degree of an electric expansion valve. First, when the operation switch is turned on (19), the electric expansion valve (2) shown in FIG. 6 is fully opened (20). Next, an initial opening degree 21 is set based on this fully open 20 signal. Next, it is determined whether the operating state 22 of the compressor of the refrigeration cycle, which will be described later, is operating or stopped. If the compressor is operating, the electric expansion valve V is initially activated as shown by a in FIG. Opening degree 2 is maintained according to the load of the refrigeration cycle from opening degree 21.
Control to maintain 3. If the compressor is stopped, the valve opening degree is set to fully open 24 as shown by b in FIG.
以上において、弁本体部２を取り替える必要がない場合
には上述のように電動式膨張弁Ｖの弁開度を第２図にａ
で示すように初期開度に設定することにより、圧縮機に
過度の液冷媒が戻ることがないため圧縮機の信頼性が落
ちることがない。In the above, if there is no need to replace the valve body 2, the valve opening degree of the electric expansion valve V is shown in FIG.
By setting the initial opening as shown in , excessive liquid refrigerant does not return to the compressor, so the reliability of the compressor does not deteriorate.
次に電動式膨張弁の弁本体を取り替える場合を説明する
。この場合例えばｚｉａｍ用サーモスタット（図示せず
）を強制的にＯＦＦ状態とすると、運転スイッチを投入
しても第１図で説明したように圧縮機が運転されないの
で初期開度２１に設定されたのち全開となる。Next, the case of replacing the valve body of the electric expansion valve will be explained. In this case, for example, if the ziam thermostat (not shown) is forcibly turned OFF, the compressor will not operate as explained in Fig. 1 even if the operation switch is turned on, so after the initial opening is set to 21. It will be fully opened.
全開状態のときは、第６図で説明したように弁体７等の
リフト距離が０５層あるので、新しい弁本体部２をモー
タ部１に取り付けてもそのドライブシャフト１６は全開
位置に保持されているため、そのドライブシャフト１６
のねじ部が破損することがない。取替後は室温調節用リ
ーモスタットを。When in the fully open state, the lift distance of the valve body 7, etc. is 05 layers as explained in FIG. Because the drive shaft 16
The threaded part of the product will not be damaged. After replacing the room temperature control leemostat.
ＯＮとして圧縮機を運転状態とし、運転スイッチを投入
すれば圧縮機が運転を開始し、電動式ｉ張弁Ｖを初期開
度から負荷に応じた開度維持がなされることとなる。When the compressor is turned on and the operation switch is turned on, the compressor starts operating, and the opening degree of the electric i-tension valve V is maintained from the initial opening degree according to the load.
第３図は上述した電動式膨張弁■を用いた冷凍サイクル
の一例を示ずもので、図において、２５は圧縮機、２６
は凝縮器、２７は蒸発器で、これら圧縮機２５．凝縮器
２６．電動膨張弁Ｖ及び蒸発器２７は順次接続されて冷
凍サイクルを構成している。Fig. 3 does not show an example of a refrigeration cycle using the above-mentioned electric expansion valve (■), and in the figure, 25 is a compressor, 26 is a
is a condenser, 27 is an evaporator, and these compressors 25. Condenser 26. The electric expansion valve V and the evaporator 27 are connected in sequence to form a refrigeration cycle.
尚、図では冷房又は暖房の一サイクルしか示していない
が圧縮１Ｉ１２５に四方弁を接続し冷暖房の双方を行う
ように構成してもよい。Although only one cycle of cooling or heating is shown in the figure, a four-way valve may be connected to the compression 1I 125 to perform both heating and cooling.
圧縮機２５の電動機はインバータ装［２８により駆動さ
れる。このインバータ装置２８は商用電源２９を一旦直
流に整流したのら、サイリスタなどで三相交流に切替え
るもので冷凍サイクルの負荷に応じて適宜変換する運転
周波数を変え負荷に合った圧縮機２５の回転数を設定す
る。The electric motor of the compressor 25 is driven by an inverter device [28]. This inverter device 28 once rectifies the commercial power supply 29 to direct current, and then switches it to three-phase alternating current using a thyristor or the like.The inverter device 28 changes the operating frequency to suit the load of the refrigeration cycle, and rotates the compressor 25 to match the load. Set the number.
この冷凍サイクルにおいて、特に暖房勺イクルの場合、
圧縮機２５が冷えているとその圧縮機２５の起動時の立
ち上がりが悪いため圧縮機２５を停止中に予熱する必要
がある。この場合圧縮間２５の温度を検出するセンサー
３０が設番）られ、このセンサー３０の検出出力が制御
器３１に入力される。この制御器３１は圧縮ｔａ２５の
運転停止中、インバータ装置ｆ２８から圧縮機２５の電
動別の巻線に通電して巻線を加熱することにより圧縮Ｉ
ｆ１２５を回転せずに予熱するものである。In this refrigeration cycle, especially in the heating cycle,
If the compressor 25 is cold, it will be difficult to start up the compressor 25, so it is necessary to preheat the compressor 25 while it is stopped. In this case, a sensor 30 is installed to detect the temperature of the compression chamber 25, and the detection output of this sensor 30 is input to the controller 31. This controller 31 controls the compression I by supplying electricity from the inverter f28 to another electric winding of the compressor 25 to heat the winding while the compressor TA25 is out of operation.
This preheats the f125 without rotating it.
この巻線による圧縮機２５の予熱は、第４図に示すよう
に、外気温或はセンサー３０からの温度が高い場合には
そのインバータ装置２８からの出力Ｃを比較的低い出ツ
ノとし、外気温或はセンサー３０からの温度が低い場合
には、第５図に示すように、出力ｄを高い出力とし、外
気温に応じて複数の出カバターンで予熱できるように構
成覆る。As shown in FIG. 4, preheating of the compressor 25 by this winding is performed by setting the output C from the inverter device 28 to a relatively low output point when the outside temperature or the temperature from the sensor 30 is high. When the air temperature or the temperature from the sensor 30 is low, the output d is set to a high output as shown in FIG. 5, and the structure is configured so that preheating can be performed with a plurality of output cover turns depending on the outside temperature.
このように外気温或は任縮ｍ温度によりその圧縮機の電
動機の巻線に通電するインバータ装置２８の出力を変化
させることにより、圧縮機２５の停止中でもｅで示づよ
うに圧縮□温度が略一定。In this way, by changing the output of the inverter device 28 that energizes the windings of the motor of the compressor depending on the outside air temperature or the arbitrary compression temperature, the compression temperature can be maintained as shown by e even when the compressor 25 is stopped. Almost constant.
に維持され、起ｅ時の立上り特性が向上される。is maintained, and the rise characteristics at the time of startup are improved.
［発明の効果］
以上詳述してきたことから明らかなように本発明によれ
ば次の如き優れた効果を発揮する。[Effects of the Invention] As is clear from the above detailed description, the present invention exhibits the following excellent effects.
（１） 圧縮機の運転状態により圧縮機の運転中は電
動式膨張弁を初ＩＩ開度に設定し、冷凍サイクルの負荷
に応じた弁開度にＮ持することにより圧縮機への液冷媒
の戻りを防止でき圧縮機の信頼性を高めることができる
。(1) Depending on the operating condition of the compressor, the electric expansion valve is set to the initial opening degree while the compressor is operating, and the liquid refrigerant to the compressor is maintained at the valve opening degree corresponding to the load of the refrigeration cycle. It is possible to prevent the return of water and improve the reliability of the compressor.
（２） 圧縮機の停止中は電動式膨張弁を全開とする
ことにより、その電動式膨張弁の弁本体部を何ら支障な
く取り替えることができ、その電動式膨張弁のサービス
性を向上することができる。(2) By fully opening the electric expansion valve while the compressor is stopped, the valve body of the electric expansion valve can be replaced without any hindrance, improving the serviceability of the electric expansion valve. I can do it.
第１図は本発明に係る電動式膨張弁の開度制御方法のフ
ローヂャートを示す図、第２図は本発明に係る電動式膨
張弁の開度制御方法における弁の開閉状態を承り図、第
３図は本発明の電動式膨張弁の開度制御方法における冷
凍サイクルの例を示す図、第４図、第５図は第３図にお
ける圧縮機の停止中の、その圧縮機の予熱状態を説明す
る図、第６図は電動式膨張弁を示す正面断面図、第７図
、第８図は従来の電動式膨張弁の弁制御を示す−図であ
る。
図中、１はモータ部、２は弁本体部、２５は圧縮機、２
６は凝縮器、２７は蒸発器、■は電動式膨張弁である。
代理人 弁理士 則 近 憲 佑第１図
第２図
町闇
第３図
第４図 第５図
（ト〜ニヱ一一、、１ ７Ｌ−よ−へ
廐 定 反
己
、 子！ハ出ｙｙ ｆ ｈ
ローｍ第６図
第７図
第８図FIG. 1 is a flowchart of the method for controlling the opening of an electric expansion valve according to the present invention, and FIG. FIG. 3 shows an example of a refrigeration cycle in the method for controlling the opening of an electric expansion valve according to the present invention, and FIGS. 4 and 5 show the preheating state of the compressor while the compressor is stopped in FIG. FIG. 6 is a front sectional view showing an electric expansion valve, and FIGS. 7 and 8 are diagrams showing valve control of a conventional electric expansion valve. In the figure, 1 is a motor part, 2 is a valve body part, 25 is a compressor, 2
6 is a condenser, 27 is an evaporator, and ■ is an electric expansion valve. Agent Patent Attorney Noriyuki Chika Figure 1 Figure 2 Machiya Figure 3 Figure 4 Figure 5 f h
Row m Figure 6 Figure 7 Figure 8
Claims (1)
る電動式膨張弁，蒸発器とを順次連結してなる冷凍サイ
クルにおいて、上記電動式膨張弁の開度を制御するに際
して、運転スイッチを投入したときに全閉信号により上
記電動式膨張弁を全閉させて開度基準を設定し、爾後初
期開度まで開いたときに上記圧縮機が停止されている場
合には電動式膨張弁を全開させることを特徴とする電動
式膨張弁の開度制御方法。In a refrigeration cycle that sequentially connects a compressor, a condenser, an electric expansion valve whose opening is adjusted by a pulse motor, and an evaporator, an operation switch is turned on to control the opening of the electric expansion valve. Sometimes, the electrically operated expansion valve is fully closed by a full close signal and an opening standard is set, and then when the compressor is stopped when the opening is opened to the initial opening, the electrically operated expansion valve is fully opened. A method for controlling the opening of an electric expansion valve, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13330684A JPS6115058A (en) | 1984-06-29 | 1984-06-29 | Method of controlling opening of electrically-operated type expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13330684A JPS6115058A (en) | 1984-06-29 | 1984-06-29 | Method of controlling opening of electrically-operated type expansion valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6115058A true JPS6115058A (en) | 1986-01-23 |
Family
ID=15101581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13330684A Pending JPS6115058A (en) | 1984-06-29 | 1984-06-29 | Method of controlling opening of electrically-operated type expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6115058A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63163748A (en) * | 1986-12-26 | 1988-07-07 | シャープ株式会社 | Method of controlling expansion valve in air conditioner |
| JPH01225863A (en) * | 1988-03-03 | 1989-09-08 | Mitsubishi Electric Corp | Opening degree control system for electric expansion valve of pulse motor driving system |
| JPH0320264U (en) * | 1989-07-10 | 1991-02-27 |
-
1984
- 1984-06-29 JP JP13330684A patent/JPS6115058A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63163748A (en) * | 1986-12-26 | 1988-07-07 | シャープ株式会社 | Method of controlling expansion valve in air conditioner |
| JPH01225863A (en) * | 1988-03-03 | 1989-09-08 | Mitsubishi Electric Corp | Opening degree control system for electric expansion valve of pulse motor driving system |
| JPH0320264U (en) * | 1989-07-10 | 1991-02-27 |
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