JPH01121668A - Method of detecting residual moisture in refrigeration cycle - Google Patents

Method of detecting residual moisture in refrigeration cycle

Info

Publication number
JPH01121668A
JPH01121668A JP28061687A JP28061687A JPH01121668A JP H01121668 A JPH01121668 A JP H01121668A JP 28061687 A JP28061687 A JP 28061687A JP 28061687 A JP28061687 A JP 28061687A JP H01121668 A JPH01121668 A JP H01121668A
Authority
JP
Japan
Prior art keywords
vacuum
refrigeration cycle
residual moisture
degree
time
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
Application number
JP28061687A
Other languages
Japanese (ja)
Inventor
Kazuo Kawamura
和夫 川村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP28061687A priority Critical patent/JPH01121668A/en
Publication of JPH01121668A publication Critical patent/JPH01121668A/en
Pending legal-status Critical Current

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  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

PURPOSE: To reduce the manufacturing cost of a refrigeration cycle, i.e., a vacuum piping system, by detecting the degree of vacuum therein after evacuating it for a predetermined time and making a decision that residual moisture is present if the detected vacuum is lower than a preset reference level. CONSTITUTION: At the time of detecting residual moisture in a refrigerating cycle 1, an evacuation process is employed as a preprocess for charging refrigerant into the refrigerating cycle 1. When evacuation is effected through a vacuum pump 2, vacuum achievement is lowered by steam if residual moisture is present in the refrigerating cycle 1 and a decision can be made that residual moisture is present if the degree of vacuum after evacuation for a predetermined time is lower than a preset reference level. The decision can be made by providing only a vacuum gauge 5 and an alarm 7 in addition to an existing evacuator. Reliability of the refrigerating cycle can be enhanced because presence of residual moisture can be determined.

Description

【発明の詳細な説明】 [発明の目的] 部に残留された水分を検出するための冷凍サイクル内の
残留水分検出方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a method for detecting residual moisture in a refrigeration cycle.

(従来の技術) 例えば冷蔵庫用の冷凍サイクル内に水分が残留されたと
きには、その水分が冷凍サイクルの配管系の一部である
キャピラリチューブ内で凍結して冷凍サイクルの機能が
低下する等の問題点が惹起される。このため、冷蔵庫の
製造時には、冷凍サイクル内の残留水分を除去するよう
にしており、この場合には、その冷凍サイクルを構成す
る各部品毎に残留水分の除去工程を実行するようにして
いる。
(Prior art) For example, when moisture remains in a refrigeration cycle for a refrigerator, the moisture freezes in the capillary tube, which is part of the piping system of the refrigeration cycle, and the function of the refrigeration cycle deteriorates. A point is evoked. For this reason, when manufacturing refrigerators, the residual moisture in the refrigeration cycle is removed, and in this case, the residual moisture removal process is performed for each component that makes up the refrigeration cycle.

(発明が解決しようとす゛る問題点) 上述のように冷凍サイクルを構成する各部品毎の残留水
分の除去工程を行なった場合でも、その後に上記各部品
の運搬時或はストック時において]−記部品内に水分が
混入して、冷凍サイクルを構成した際に不良が発生する
ことがある。従って、実際には、冷凍サイクルをを完成
させた状態で、その冷凍サイクル内の残留水分を検出し
、斯かる検出結果に基づいて冷凍サイクルの不良の有無
を判断することが望ましい。しかしながら、従来では、
このように完成された状態の冷凍サイクル内の残留水分
を複雑な装置を使用せずに簡便に検出する方法が存在せ
ず、このため冷凍サイクルの信頼性低ドを招くという問
題点があった。また、実際には」−記のような問題点に
対処するために、各部品毎に残留水分の管理を厳しくし
ているのが実情であって、このように各部品の残留水分
管理を厳しく行なわねばならない分だけ製造コストの−
1−昇を来たすものであり、この点が未解決の課題とな
っていた。
(Problems to be Solved by the Invention) Even if the process of removing residual moisture from each part constituting the refrigeration cycle is carried out as described above, the process of removing residual moisture from each part constituting the refrigeration cycle afterward, when transporting or stocking each part, does not result in Moisture may enter the parts and cause defects when constructing the refrigeration cycle. Therefore, in reality, it is desirable to detect residual moisture in the refrigeration cycle after the refrigeration cycle is completed, and to determine whether or not there is a defect in the refrigeration cycle based on the detection result. However, conventionally,
There is no way to easily detect residual moisture in a completed refrigeration cycle without using complicated equipment, and this has led to the problem of low reliability of the refrigeration cycle. . In addition, in reality, in order to deal with the problems mentioned above, the residual moisture of each part is strictly controlled. The manufacturing cost is reduced by the amount of work that must be done.
1- increase, and this point remained an unresolved issue.

本発明はL記事情に鑑みてなされたものであり、その目
的は、冷凍サイクル内の残留水分の有無を、その冷凍サ
イクルを完成させるのに本来的に必要な真空引き工程を
利用することによって極めて簡便に検出でき、これによ
り上記冷凍サイクルの信頼性向上並びにその冷凍サイク
ルの製造コストの引下げ等を図り得る冷凍サイクル内の
残留水分検出方法を提供するにある。
The present invention was made in view of the above circumstances, and its purpose is to check the presence or absence of residual moisture in the refrigeration cycle by utilizing the vacuuming process that is essentially necessary to complete the refrigeration cycle. It is an object of the present invention to provide a method for detecting residual moisture in a refrigeration cycle that can be detected extremely easily and thereby improve the reliability of the refrigeration cycle and reduce the manufacturing cost of the refrigeration cycle.

[発明の構成] (問題点を解決するための手段) 本発明による冷凍サイクル内の残留水分検出方法は、真
空配管系内の真空引きを行なう際には、内部の残留水分
による蒸気圧が当該真空配管系内の到達真空度を低下さ
せるという現象を利用したものであり、真空配管系であ
る冷凍サイクル内の真空引きを一定時間行なった時点で
、その冷凍サイクル内の真空度を検知し、このように検
知した真空度が予め設定された基準値以下の状態を残留
水分ありと判定する点に特徴を有する。
[Structure of the Invention] (Means for Solving the Problems) The method for detecting residual moisture in a refrigeration cycle according to the present invention is such that when the vacuum piping system is evacuated, the vapor pressure due to the residual moisture inside is This system utilizes the phenomenon of reducing the ultimate vacuum within the vacuum piping system, and detects the vacuum level within the refrigeration cycle after the refrigeration cycle, which is the vacuum piping system, has been evacuated for a certain period of time. The present invention is characterized in that a state in which the degree of vacuum detected in this manner is equal to or less than a preset reference value is determined to be that there is residual moisture.

(作用) 冷凍サイクル内の真空引き時において冷凍サイクル内に
残留水分が存在した場合には、その水分による蒸気圧が
真空到達度を低下させるようになる。このため、冷凍サ
イクル内の真空引きを一定時間行なった時点の真空度は
、内部に残留水分がない場合とある場合とで自ずと異な
るようになり、また、残留水分の量によっても異なって
くる。
(Function) If there is residual moisture in the refrigeration cycle when the refrigeration cycle is evacuated, the vapor pressure due to the moisture will reduce the degree of vacuum attainment. For this reason, the degree of vacuum at the time when the refrigeration cycle is evacuated for a certain period of time will naturally differ depending on whether there is any residual moisture inside or not, and will also vary depending on the amount of residual moisture.

従って、冷凍サイクル内の真空引きを一定時間行なった
時点での真空度が予め設定された基準値以下の場合には
、これを残留水分ありと判定することができる。このよ
うな残留水分の判定を行なう場合には、冷凍サイクルを
完成させるために本来的に必要な真空引き装置の他に真
空度を測定するための装置を設けるだけで済むものであ
り、結果的に、冷凍サイクル内の残留水分の有無を央雑
な装置を使用することなく簡便に判定することができる
Therefore, if the degree of vacuum at the time when the refrigeration cycle has been evacuated for a certain period of time is less than a preset reference value, it can be determined that there is residual moisture. When determining residual moisture in this way, it is only necessary to install a device to measure the degree of vacuum in addition to the vacuum device originally required to complete the refrigeration cycle. Furthermore, the presence or absence of residual moisture in the refrigeration cycle can be easily determined without using complicated equipment.

(実施例) 第1図において、1は例えば冷蔵庫用の冷凍サイクルで
あり、この冷凍サイクル1内には、その真空引きを行な
った後に冷媒がチャージされる。
(Embodiment) In FIG. 1, reference numeral 1 denotes a refrigeration cycle for a refrigerator, for example, and a refrigerant is charged into the refrigeration cycle 1 after it is evacuated.

2は−1−記冷凍サイクル1内の真空引きを行なうため
の真空ポンプであり、この真空ポンプ2と冷凍サイクル
1との間を繋ぐ排気路3には真空バルブ4が介在されて
いる。5は出力接点付きの真空計で、これは冷凍サイク
ル1及び真空バルブ4間の排気路3に接続され、以てそ
の排気路3ひいては冷凍サイクル1内の真空度を検知可
能に設けられている。この真空計5は、その検知真空度
が予め設定された基準値SVL以下の状態でタイマ6か
らの動作指令信号slを受けたときに、図示しない出力
接点をオンして検知信号Sdを出力するように構成され
ている。
Reference numeral 2 denotes a vacuum pump for evacuating the inside of the refrigeration cycle 1 described in -1-, and a vacuum valve 4 is interposed in an exhaust passage 3 connecting the vacuum pump 2 and the refrigeration cycle 1. Reference numeral 5 denotes a vacuum gauge with an output contact, which is connected to the exhaust path 3 between the refrigeration cycle 1 and the vacuum valve 4, and is provided so as to be able to detect the degree of vacuum within the exhaust path 3 and, by extension, the refrigeration cycle 1. . When this vacuum gauge 5 receives an operation command signal sl from a timer 6 when its detected vacuum level is below a preset reference value SVL, it turns on an output contact (not shown) and outputs a detection signal Sd. It is configured as follows.

上記タイマ6は、前記動作指令信号Slの他に前記真空
バルブ4を閉鎖させるための閉鎖指令信号S。を出力す
るように設けられている。具体的には、タイマ6は、真
空ポンプ2による真空引き動作が開始されたときにタイ
マ動作を開始し、その開始時点から一定時間T1が経過
したときに、真空バルブ3に対して閉鎖指令信号S、を
出力してこれを閉鎖させると共に、この後にさらに一定
時間T1が経過したときに、前記動作指令信号S1を出
力して真空計5に与えるよう構成されている。7はタイ
マ6と共に図示しない制御盤に配設された報知装置で、
これは真空計5から検知信号Sdが出力されたときに例
えばランプの点灯或はブザーの鳴動等によって「残留水
分有り」を示す報知を行なうようになっている。
The timer 6 generates a closing command signal S for closing the vacuum valve 4 in addition to the operation command signal Sl. It is designed to output. Specifically, the timer 6 starts the timer operation when the vacuum pump 2 starts the evacuation operation, and when a certain period of time T1 has elapsed from the start time, the timer 6 issues a closing command signal to the vacuum valve 3. It is configured to output the operation command signal S1 to close it, and to output the operation command signal S1 and give it to the vacuum gauge 5 when a certain period of time T1 has elapsed thereafter. 7 is a notification device installed in a control panel (not shown) together with the timer 6;
When the detection signal Sd is output from the vacuum gauge 5, a notification indicating that "residual moisture is present" is issued by, for example, lighting a lamp or sounding a buzzer.

さて、冷凍サイクル1内の残留水分を検知する場合には
、その冷凍サイクル1内へ冷媒をチャージする際の前工
程である真空引き工程を利用する。
Now, when detecting the residual moisture in the refrigeration cycle 1, a vacuuming process which is a pre-process when charging the refrigerant into the refrigeration cycle 1 is used.

つまり、真空ポンプ2によって上記真空引き工程が行な
われたときには、冷凍サイクル1内の真空度は時間の経
過に伴い第2図に示すように変化する。ここで、上記真
空度は、冷凍サイクル1内に残留水分が存在しない状態
では第2図に実線で示すように変化するが、冷凍サイク
ルl内に残留水分が存在した場合には、その水分による
蒸気圧の影響によって真空到達度が低下するため、例え
ば第2図に二点鎖線で示すように変化する。一方、タイ
マ6は、真空ポンプ2による真空引き工程が開始された
ときにタイマ゛動作を開始し、この後に一定時間T1が
経過したときに閉鎖指令信号S。
That is, when the vacuum pump 2 performs the evacuation step, the degree of vacuum within the refrigeration cycle 1 changes as time passes, as shown in FIG. 2. Here, the above degree of vacuum changes as shown by the solid line in Figure 2 when there is no residual moisture in the refrigeration cycle 1, but if there is residual moisture in the refrigeration cycle 1, the degree of vacuum changes due to the moisture. Since the degree of vacuum attainment decreases due to the influence of vapor pressure, it changes as shown by the two-dot chain line in FIG. 2, for example. On the other hand, the timer 6 starts its operation when the vacuum pump 2 starts the evacuation process, and then outputs the closing command signal S when a certain period of time T1 has elapsed.

を出力して真空バルブ4を閉鎖させる(第2図中の時刻
to)。すると、冷凍サイクル1内の真空度は、その冷
凍サイクル1内と真空バルブ4の取付位置との間の圧力
差、即ち容積に対応する分だけ時刻t。から第2図に示
すように低下するようになる。
is output to close the vacuum valve 4 (time to in FIG. 2). Then, the degree of vacuum in the refrigeration cycle 1 increases at time t by an amount corresponding to the pressure difference, that is, the volume, between the inside of the refrigeration cycle 1 and the mounting position of the vacuum valve 4. As shown in FIG. 2, it starts to decrease.

タイマ6は、上記のように真空バルブ4を閉鎖した時刻
toから一定時間T1が経過した時刻t1に動作指令信
号Slを出力して真空計5に与える。このとき、真空計
5にあっては、その検知真空度が基準値SVL以下であ
ったときのみ出力接点をオンして検知信号Sdを出力す
る。ここで、」二記基準値Svi、は、冷凍サイクル1
内に許容量具」―の水分が存在したときにおける時刻t
lでの検知真空度に対応されている。従って、冷凍サイ
クル1内に許容量以上の水分が存在したときには、検知
信号Sdが出力されて報知装置7に与えられるため、報
知装置7が「残留水分あり」を示す報知を行なうように
なる。従って、斯様な報知に基づいて不良な冷凍サイク
ルを排除することができる。
The timer 6 outputs an operation command signal Sl to the vacuum gauge 5 at a time t1 when a certain period of time T1 has elapsed from the time to when the vacuum valve 4 was closed as described above. At this time, the vacuum gauge 5 turns on the output contact and outputs the detection signal Sd only when the detected degree of vacuum is below the reference value SVL. Here, "2 standard value Svi," is the refrigeration cycle 1
Time t when there is an allowable amount of moisture in the device
It corresponds to the detection vacuum degree at l. Therefore, when there is moisture in the refrigeration cycle 1 in an amount exceeding the allowable amount, the detection signal Sd is outputted and given to the notification device 7, so that the notification device 7 issues a notification indicating that "residual moisture exists." Therefore, defective refrigeration cycles can be eliminated based on such notification.

本実施例によれば、上記の如く冷凍サイクル1を完成さ
せた状態で、その冷凍サイクル1内の残留水分を検出で
きるものであるが、このような検出を、冷媒チャージの
ために本来的に必要な真空引き工程を利用して行なうよ
うにしたから、真空計5及び報知装置7を余分に設ける
だけで済む。
According to this embodiment, residual moisture in the refrigeration cycle 1 can be detected after the refrigeration cycle 1 is completed as described above. Since this is carried out using the necessary evacuation step, it is only necessary to provide an extra vacuum gauge 5 and an alarm device 7.

従って、冷凍サイクル1内の残留水分の有無を曵雑な装
置を使用することなく簡便に判定でき、しかも斯かる判
定のために必要な時間の短縮も同時に図り得る。勿論、
冷凍サイクル1の完成状態で残留水分の有無を判定でき
る結果、冷凍サイクルの信頼性を高めることができる。
Therefore, the presence or absence of residual moisture in the refrigeration cycle 1 can be easily determined without using complicated equipment, and the time required for such determination can be shortened at the same time. Of course,
As a result of being able to determine the presence or absence of residual moisture in the completed state of the refrigeration cycle 1, the reliability of the refrigeration cycle can be improved.

また、冷凍サイクル1を構成する各部品毎の残留水分管
理を従来のように厳しく行なう必要がなく、以て製造コ
ストの引下げを図り得る。
Furthermore, there is no need to strictly manage residual moisture in each component of the refrigeration cycle 1, as in the past, thereby reducing manufacturing costs.

尚、」〕記実施例では、真空バルブ4の閉鎖後に一定時
間が経過した時点で残留水分の有無を判定するようにし
たが、例えば真空バルブ4の閉鎖時点で残留水分の有無
を判定するようにしても良い。
In the above embodiment, the presence or absence of residual moisture is determined after a certain period of time has elapsed after the vacuum valve 4 is closed. You can also do it.

その他、本発明は上記し且つ図面に示した各実施例に限
定されるものではなく、例えば冷蔵庫用の冷凍サイクル
に限らず、エアコン用の冷凍サイクルにも利用できる等
、その要旨を逸脱しない範囲で種々変形して実施するこ
とができる。
In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be used not only for refrigeration cycles for refrigerators but also for refrigeration cycles for air conditioners, etc., within the scope of the invention. It can be implemented with various modifications.

[発明の効果] 本発明によれば以上の説明によって明らかなように、冷
凍サイクル内の真空引きを一定時間行なった時点で、そ
の冷凍サイクル内の真空度を検知し、このように検知し
た真空度が予め設定された基り値以下の状態を残留水分
ありと判定する構成としたので、冷凍サイクル内の残留
水分をtド純な装置の利用によって極めて簡便に検出す
ることができ、これにより上記真空装置を利用した装置
の信頼性向−ト並びに同装置の製造コストの引下げ等を
図り得るという優れた効果を奏するものである。
[Effects of the Invention] According to the present invention, as is clear from the above explanation, the degree of vacuum in the refrigeration cycle is detected when the refrigeration cycle is evacuated for a certain period of time, and the vacuum level detected in this way is detected. Since the structure is configured to determine that there is residual moisture when the temperature is less than a preset reference value, residual moisture in the refrigeration cycle can be detected extremely easily by using a simple device. This has the excellent effect of improving the reliability of a device using the above-mentioned vacuum device and reducing the manufacturing cost of the device.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の一実施例を説明するためのもので、第1
図は残留水分検知用の装置のシステム図、第2図は冷凍
サイクル内の真空引きに伴う真空度の鹿化状態を示す特
性図である。 図中、1は冷凍サイクル、2は真空ポンプ、4は真空バ
ルブ、5は真空計、6はタイマ、7は報知装置を示す。 出願人  株式会社  東  芝
The drawings are for explaining one embodiment of the present invention.
The figure is a system diagram of a device for detecting residual moisture, and FIG. 2 is a characteristic diagram showing the change in the degree of vacuum caused by evacuation within the refrigeration cycle. In the figure, 1 is a refrigeration cycle, 2 is a vacuum pump, 4 is a vacuum valve, 5 is a vacuum gauge, 6 is a timer, and 7 is a notification device. Applicant: Toshiba Corporation

Claims (1)

【特許請求の範囲】[Claims] 1.冷凍サイクル内へ冷媒をチャージする前の真空引き
工程において、その真空引きを一定時間行なった時点で
、上記冷凍サイクル内の真空度を検知すると共に、この
ように検知した真空度が予め設定された基準値以下の状
態を残留水分ありと判定することを特徴とする冷凍サイ
クル内の残留水分検出方法。
1. In the evacuation step before charging the refrigerant into the refrigeration cycle, the degree of vacuum in the refrigeration cycle is detected at the time when the evacuation has been performed for a certain period of time, and the degree of vacuum detected in this way is set in advance. A method for detecting residual moisture in a refrigeration cycle, characterized in that a state below a reference value is determined to be the presence of residual moisture.
JP28061687A 1987-11-06 1987-11-06 Method of detecting residual moisture in refrigeration cycle Pending JPH01121668A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28061687A JPH01121668A (en) 1987-11-06 1987-11-06 Method of detecting residual moisture in refrigeration cycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28061687A JPH01121668A (en) 1987-11-06 1987-11-06 Method of detecting residual moisture in refrigeration cycle

Publications (1)

Publication Number Publication Date
JPH01121668A true JPH01121668A (en) 1989-05-15

Family

ID=17627525

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28061687A Pending JPH01121668A (en) 1987-11-06 1987-11-06 Method of detecting residual moisture in refrigeration cycle

Country Status (1)

Country Link
JP (1) JPH01121668A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004012126A (en) * 1998-05-26 2004-01-15 Matsushita Electric Ind Co Ltd Storage/transportation/installation method for air conditioner
KR100677263B1 (en) * 2005-02-04 2007-02-02 엘지전자 주식회사 Detecting method for poor vacuum of multi air-conditioner and detecting apparatus thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004012126A (en) * 1998-05-26 2004-01-15 Matsushita Electric Ind Co Ltd Storage/transportation/installation method for air conditioner
KR100677263B1 (en) * 2005-02-04 2007-02-02 엘지전자 주식회사 Detecting method for poor vacuum of multi air-conditioner and detecting apparatus thereof

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