JPH044504B2 - - Google Patents
Info
- Publication number
- JPH044504B2 JPH044504B2 JP7270185A JP7270185A JPH044504B2 JP H044504 B2 JPH044504 B2 JP H044504B2 JP 7270185 A JP7270185 A JP 7270185A JP 7270185 A JP7270185 A JP 7270185A JP H044504 B2 JPH044504 B2 JP H044504B2
- Authority
- JP
- Japan
- Prior art keywords
- main motor
- refrigerant pump
- starting
- refrigerant
- refrigerator
- 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
Links
- 239000003507 refrigerant Substances 0.000 claims description 63
- 239000007788 liquid Substances 0.000 claims description 20
- 238000010586 diagram Methods 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、凝縮冷媒液をモータ内部に導入して
モータの冷却を行うようにした冷凍機に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigerator in which a condensed refrigerant liquid is introduced into the motor to cool the motor.
〔従来の技術〕
このような冷媒液によるモータ冷却方式は、例
えば特開昭58−110963号公報に開示されている如
く、主モータの発生熱を回収、放熱する際に、凝
縮器において冷却水に直接放熱を行うものであ
り、冷凍機の圧縮動力を消費しないので、省エネ
ルギに関し効果のある冷却方式である。[Prior Art] Such a motor cooling method using a refrigerant liquid is disclosed in Japanese Patent Application Laid-open No. 58-110963, for example, when the heat generated by the main motor is recovered and radiated, cooling water is used in the condenser. This is a cooling method that is effective in terms of energy saving, as it radiates heat directly to the refrigerator and does not consume the compression power of the refrigerator.
このような冷凍機においては、冷媒液を凝縮器
から主モータに供給するため、主モータに連動さ
せて冷媒ポンプを運転させる必要がある。しかし
ながら、従来の冷凍機においてはこの冷媒ポンプ
が、特に始動時にキヤビテーシヨンを起こし、振
動、騒音を発生したり、冷媒ポンプを軸受の潤滑
不良などの不具合がみられた。
In such a refrigerator, in order to supply refrigerant liquid from the condenser to the main motor, it is necessary to operate the refrigerant pump in conjunction with the main motor. However, in conventional refrigerators, the refrigerant pump has experienced problems such as cavitation, vibration and noise, and poor lubrication of the refrigerant pump bearings, especially when starting.
発明者らは、この問題点を解決するために研
究、実験を重ね、その折りに得られた知見に基づ
き本発明がなされた。 The inventors conducted repeated research and experiments to solve this problem, and based on the knowledge obtained during the research, the present invention was made.
即ち、このキヤビテーシヨン現象は、冷凍機の
始動時の或る期間に、凝縮器で凝縮する冷媒液が
十分な量に達せず、そのため冷媒ポンプの吸込み
に必要な冷媒液量が不足し、そのために起こるこ
とが確認された。 In other words, this cavitation phenomenon occurs when the refrigerant liquid that is condensed in the condenser does not reach a sufficient amount during a certain period when the refrigerator is started, and as a result, the amount of refrigerant liquid necessary for suction into the refrigerant pump is insufficient. confirmed to occur.
一方、このような用途に用いる冷媒用ポンプと
しては、冷凍機の気密性を確保するために、通常
はキヤンド型の構造が用いられて軸受が冷媒液に
より潤滑されている。従つて冷媒液不足によりキ
ヤビテーシヨンが発生するような状態では、冷媒
液による軸受の潤滑が十分に行われなくなり、こ
のような状態が長く続くと冷媒ポンプの寿命を短
縮することがあることが確かめられた。 On the other hand, in order to ensure the airtightness of the refrigerator, refrigerant pumps used in such applications usually have a canned structure, and the bearings are lubricated with refrigerant liquid. Therefore, it has been confirmed that when cavitation occurs due to a lack of refrigerant liquid, the bearings are not sufficiently lubricated by the refrigerant liquid, and if this condition continues for a long time, the life of the refrigerant pump may be shortened. Ta.
本発明は、従来のものの上記の如き問題点を解
決し、冷凍機始動時における凝縮冷媒液不足に基
づくキヤビテーシヨンを防止する冷凍機を提供す
ることを目的とするものである。 SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional refrigerator and to provide a refrigerator that prevents cavitation due to insufficient condensed refrigerant liquid when starting the refrigerator.
本発明は、蒸発器、凝縮器、圧縮機及び該圧縮
機を駆動する主モータを備え、該主モータの内部
空間を前記凝縮器に通路で接続すると共に、該凝
縮器で凝縮した冷媒液を前記主モータの内部空間
に冷媒ポンプを介して導入する通路を設けた冷凍
機において、
前記冷凍機の始動に当たり、前記主モータの結
線が少なくとも始動結線となつている期間中は、
前記冷媒ポンプの運転が停止しているように冷媒
ポンプの運転用電磁開閉器を主モータの始動完了
の信号と連動して閉路させる結線回路を備えたこ
とを特徴とする冷凍機である。
The present invention includes an evaporator, a condenser, a compressor, and a main motor that drives the compressor, and connects an internal space of the main motor to the condenser through a passage, and also connects the refrigerant liquid condensed in the condenser to the main motor. In a refrigerator provided with a passage for introducing refrigerant into the internal space of the main motor via a refrigerant pump, when starting the refrigerator, during a period when the connection of the main motor is at least the starting connection,
The refrigerator is characterized in that it includes a connection circuit that closes an electromagnetic switch for operating the refrigerant pump in conjunction with a signal indicating completion of starting of the main motor so that the operation of the refrigerant pump is stopped.
本発明の実施例を図面を用いて説明する。 Embodiments of the present invention will be described using the drawings.
第１図に示された冷凍機は、蒸発器１、凝縮器
３、圧縮機７、及びこれを増速機１０を介して駆
動する主モータ１１を備え、主モータ１１の内部
空間を通路２１を介して凝縮器３に接続し、冷媒
蒸気は凝縮器３内で冷却水管４内の冷却水により
冷却されて凝縮して冷媒液となりフロート室１２
に貯留される。この冷媒液の一部は、冷媒ポンプ
２０、通路１４を介して主モータ１１の内部空間
に導かれスプレイノズル１５で散布されるように
なつている。 The refrigerator shown in FIG. 1 includes an evaporator 1, a condenser 3, a compressor 7, and a main motor 11 that drives these via a speed increaser 10. The refrigerant vapor is cooled in the condenser 3 by the cooling water in the cooling water pipe 4 and condensed to become a refrigerant liquid in the float chamber 12.
is stored in A portion of this refrigerant liquid is introduced into the internal space of the main motor 11 via the refrigerant pump 20 and the passage 14, and is sprayed by a spray nozzle 15.
フロート室１２の冷媒液は、フロート弁１６に
て減圧されて蒸発器１内に入り、冷水管２中に冷
水により加熱されて蒸発して冷媒蒸気となり、こ
の冷媒蒸気は吸込通路５を通り、アクチユエータ
１７により操作される容量制御弁９を経て圧縮機
７に吸い込まれ、圧縮されて再び凝縮器３に入
り、冷凍サイクルを形成する。 The refrigerant liquid in the float chamber 12 is depressurized by the float valve 16 and enters the evaporator 1, heated by cold water in the cold water pipe 2, and evaporated to become refrigerant vapor.This refrigerant vapor passes through the suction passage 5, It is sucked into the compressor 7 through the capacity control valve 9 operated by the actuator 17, compressed, and enters the condenser 3 again to form a refrigeration cycle.
スプレイノズル１５にて主モータ１１内に散布
された冷媒液は、主モータ１１内部の熱の奪つて
主モータ内部を冷却しつつ自らは蒸発して冷媒蒸
気となり、この冷媒蒸気は通路２１を通つて凝縮
器３に流入し、冷却水管４の冷却水により冷却さ
れて凝縮し冷媒液となつてフロート室１２に貯留
される。 The refrigerant liquid sprayed into the main motor 11 by the spray nozzle 15 takes away the heat inside the main motor 11 and cools the inside of the main motor, while evaporating itself into refrigerant vapor, and this refrigerant vapor passes through the passage 21. The refrigerant then flows into the condenser 3, is cooled by the cooling water in the cooling water pipe 4, condenses, becomes a refrigerant liquid, and is stored in the float chamber 12.
１８は操作盤、１９は高圧盤であり、以下に説
明するような作用をなす。 Reference numeral 18 is an operation panel, and 19 is a high-pressure panel, which functions as explained below.
第２図ａは主モータ１１用高圧盤１９の結線
図、第２図ｂは操作盤１８内の冷媒ポンプ２０の
制御結線図である。これらの図において、T1は
主モータ用電源端子、４２は運転用電磁開閉器、
及びそれと連動する接点、５２は主開閉用電磁開
閉器、６０は始動用電磁開閉器、S1は制御電源、
８８RPは冷媒ポンプ２０の電源を入切する冷媒
ポンプ用電磁開閉器である。 FIG. 2a is a wiring diagram of the high pressure plate 19 for the main motor 11, and FIG. 2b is a control wiring diagram of the refrigerant pump 20 in the operation panel 18. In these figures, T1 is the main motor power supply terminal, 42 is the electromagnetic switch for operation,
and contacts interlocking therewith, 52 is a main opening/closing electromagnetic switch, 60 is a starting electromagnetic switch, S 1 is a control power supply,
88RP is a refrigerant pump electromagnetic switch that turns on and off the power of the refrigerant pump 20.
主モータ１１の始動に当たつて、当初電磁開閉
器５２，６０が投入されて、電磁開閉器４２は切
放され、主モータ１１は始動結線としてのスター
結線により運転される。始動を完了すると電磁開
閉器６０は切放され、続いて電磁開閉器４２が投
入され、主モータ１１の結線はデルタ結線となり
定常運転が行われる。 When starting the main motor 11, the electromagnetic switches 52 and 60 are initially closed, the electromagnetic switch 42 is disconnected, and the main motor 11 is operated with a star connection as a starting connection. When starting is completed, the electromagnetic switch 60 is disconnected, and then the electromagnetic switch 42 is closed, and the main motor 11 is connected to the delta connection, and steady operation is performed.
このような冷凍機の始動時に当たり、始動結線
であるスター結線が適用されている期間において
は、主モータ１１の回転数は所定の定格回転数に
達せず、圧縮機においても十分な圧縮作用を発揮
しない。この始動時の圧縮作用の不足は、特に遠
心圧縮機において顕著であり、そのため、冷凍サ
イクルが十分に形成されず、凝縮器３において凝
縮する冷媒液量は極めて少ない。この点に着目し
て、本実施例においては始動結線であるスター結
線が適用される期間、冷媒ポンプ２０の運転を保
留しておき、その後圧縮機７の回転数が十分大と
なり、冷凍サイクルが形成される条件が満足され
るようになつたときにデルタ結線への切り換えを
行うところの電磁開閉器４２の投入（即ちスター
結線期間の終了時点、即ち、始動完了時点）信号
により、これと連動させて接点４２を閉じて冷媒
ポンプ２０用の電磁開閉器88RPに通電し、冷媒
ポンプ２０の運転を開始するようにしたものであ
る。 At the time of starting such a refrigerator, during the period when the star connection, which is the starting connection, is applied, the rotation speed of the main motor 11 does not reach the predetermined rated rotation speed, and the compressor does not have sufficient compression action. Does not perform well. This lack of compression action at startup is particularly noticeable in centrifugal compressors, and as a result, the refrigeration cycle is not sufficiently formed and the amount of refrigerant liquid condensed in the condenser 3 is extremely small. Focusing on this point, in this embodiment, the operation of the refrigerant pump 20 is suspended during the period when the star connection, which is the starting connection, is applied, and then the rotation speed of the compressor 7 becomes sufficiently high, and the refrigeration cycle starts. When the conditions for formation are satisfied, the electromagnetic switch 42 switches to the delta connection, which is activated by a signal (i.e., at the end of the star connection period, i.e., at the completion of starting). Then, the contact 42 is closed, the electromagnetic switch 88RP for the refrigerant pump 20 is energized, and the operation of the refrigerant pump 20 is started.
主モータ１１の始動方式としては、一般的に用
いられている上述のステーデルタ始動方式の他の
方式、即ち、コンドルフア始動方式、コンペンセ
ータ始動方式などを用いる場合においても上記の
方式を適用することができ、この場合においても
始動結線を適用している始動期間中、冷媒ポンプ
２０の運転が停止状態のまま保留される。 As a starting method for the main motor 11, the above-mentioned method can be applied even when using other methods than the above-mentioned generally used stage delta starting method, such as the condolfer starting method or the compensator starting method. Even in this case, the operation of the refrigerant pump 20 is suspended in a stopped state during the startup period when the startup connection is applied.
このように始動期間中、冷媒ポンプ２０の運転
を停止したまま保留し、その後、始動期間が終了
し圧縮機７の回転数が所定の値に達してから冷媒
ポンプ２０の運転を開始するようにしたので、冷
媒ポンプ２０の運転開始時には十分な量の冷媒液
が確保されており、液不足によるキヤビテーシヨ
ンを生ずることなく、冷媒ポンプ２０の軸受部の
潤滑が十分行われる。 In this way, during the startup period, the operation of the refrigerant pump 20 is kept stopped, and then, after the startup period ends and the rotation speed of the compressor 7 reaches a predetermined value, the operation of the refrigerant pump 20 is started. Therefore, a sufficient amount of refrigerant liquid is secured when the refrigerant pump 20 starts operating, and the bearing portion of the refrigerant pump 20 is sufficiently lubricated without cavitation due to lack of liquid.
第３図は別の実施例の冷媒ポンプ２０の制御結
線図であり、２Ｔは限時継電器及びその接点であ
り、始動結線から運転用結線に切り換えた後、一
定時間後に冷媒ポンプ２０用の電磁開閉器８８
RPに通電し、冷媒ポンプ２０の運転を開始する
ようにしたものである。このように構成すること
により、少なくとも始動結線の期間中は冷媒ポン
プ２０が停止されたまま保留されているほか、冷
凍機の使用条件に合わせて停止時間の調整が可能
となり、一層安定した運転を行うことができる。 FIG. 3 is a control wiring diagram of the refrigerant pump 20 of another embodiment, where 2T is a time-limited relay and its contacts, and after a certain period of time, the electromagnetic opening/closing for the refrigerant pump 20 is performed after switching from the starting connection to the operation connection. vessel 88
The RP is energized and the refrigerant pump 20 starts operating. With this configuration, the refrigerant pump 20 is kept stopped at least during the start connection period, and the stop time can be adjusted according to the conditions of use of the refrigerator, resulting in more stable operation. It can be carried out.
本発明は、冷凍機の始動に当たり、主モータの
結線が少なくとも始動結線となつている期間中
は、冷媒ポンプの運転が停止しているように冷媒
ポンプの運転用電磁開閉器を主モータの始動完了
の信号と連動して閉路させる結線回路を備えたこ
とにより、冷凍機の始動時における冷媒液の不足
に基づく冷媒ポンプのキヤビテーシヨンの発生を
防止し、軸受の潤滑不良による損傷を防ぎ、冷媒
ポンプの耐久性を向上させると共に、この冷媒ポ
ンプの作用によつてなされる主モータの冷却動作
の信頼性の向上を図ることができる冷凍機を提供
することを可能とし、実用上極めて大なる効果を
奏する。
In the present invention, when starting a refrigerator, the electromagnetic switch for operating the refrigerant pump is connected to the main motor so that the operation of the refrigerant pump is stopped during the period when the connection of the main motor is at least the starting connection. Equipped with a connection circuit that closes in conjunction with the completion signal, it prevents cavitation of the refrigerant pump due to lack of refrigerant liquid when starting the refrigerator, prevents damage due to poor lubrication of the bearing, and prevents the refrigerant pump It is possible to provide a refrigerator that can improve the durability of the main motor and improve the reliability of the cooling operation of the main motor performed by the action of the refrigerant pump, and has an extremely large practical effect. play.
第１図は、本発明の実施例のフロー図、第２図
はａは、その主モータの高圧盤の結線図、同図ｂ
は操作盤の結線図、第３図は別の実施例の操作盤
の結線図の一部である。
１……蒸発器、２……冷水管、３……凝縮器、
４……冷却水管、５……吸込通路、７……圧縮
機、９……容量制御弁、１０……増速機、１１…
…主モータ、１２……フロート室、１４……通
路、１５……スプレイノズル、１６……フロート
弁、１７……アクチユエータ、１８……操作盤、
１９……高圧盤、２０……冷媒ポンプ、２１……
通路、４２……電磁開閉器又はその接点、５２，
６０……電磁開閉器又はその接点、T1……モー
タ用電源端子、S1……制御電源、２Ｔ……限時継
電器又はその接点、８８RP……電磁開閉器。
Fig. 1 is a flow diagram of an embodiment of the present invention, Fig. 2 a is a wiring diagram of the high voltage plate of the main motor, and Fig. 2 b is a wiring diagram of the high voltage plate of the main motor.
3 is a wiring diagram of the operation panel, and FIG. 3 is a part of the wiring diagram of the operation panel of another embodiment. 1... Evaporator, 2... Cold water pipe, 3... Condenser,
4... Cooling water pipe, 5... Suction passage, 7... Compressor, 9... Capacity control valve, 10... Speed increaser, 11...
... Main motor, 12 ... Float chamber, 14 ... Passage, 15 ... Spray nozzle, 16 ... Float valve, 17 ... Actuator, 18 ... Operation panel,
19...High pressure panel, 20... Refrigerant pump, 21...
Passage, 42... Electromagnetic switch or its contact, 52,
60...Electromagnetic switch or its contacts, T1 ...Motor power supply terminal, S1 ...Control power supply, 2T...Time-limiting relay or its contacts, 88RP...Magnetic switch.
Claims (1)
を駆動する主モータ１１を備え、該主モータ１１
の内部空間を前記凝縮器３に通路２１で接続する
と共に、該凝縮器３で凝縮した冷媒液を前記主モ
ータ１１の内部空間に冷媒ポンプ２０を介して導
入する通路１４を設けた冷凍機において、 前記冷凍機の始動に当たり、前記主モータ１１
の結線が少なくとも始動結線となつている期間中
は、前記冷媒ポンプ２０の運転が停止しているよ
うに冷媒ポンプ２０の運転用電磁開閉器８８RP
を主モータ１１の始動完了の信号と連動して閉路
させる結線回路を備えたことを特徴とする冷凍
機。 ２ 前記冷媒ポンプ２０が、前記主モータ１１の
始動完了の信号を受けたのち一定時間後に駆動せ
しめられるように冷媒ポンプ２０を運転用電磁開
閉器８８RPを主モータ１１の始動完了の信号を
受けてから一定時間後に閉路させる結線回路を備
えた特許請求の範囲第１項記載の冷凍機。[Claims] 1. An evaporator 1, a condenser 3, a compressor 7, and a main motor 11 for driving the compressor.
In the refrigerator, the internal space of the main motor 11 is connected to the condenser 3 by a passage 21, and a passage 14 is provided for introducing the refrigerant liquid condensed in the condenser 3 into the internal space of the main motor 11 via a refrigerant pump 20. , When starting the refrigerator, the main motor 11
During the period when the connection is at least the starting connection, the electromagnetic switch 88RP for operating the refrigerant pump 20 is connected so that the operation of the refrigerant pump 20 is stopped.
A refrigerator comprising a connection circuit that closes a circuit in conjunction with a signal indicating completion of starting of a main motor 11. 2. When the refrigerant pump 20 receives the signal indicating the completion of starting of the main motor 11, the electromagnetic switch 88RP for operating the refrigerant pump 20 is activated so that the refrigerant pump 20 is driven after a certain period of time after receiving the signal indicating the completion of starting of the main motor 11. The refrigerator according to claim 1, further comprising a connection circuit that is closed after a certain period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7270185A JPS61231359A (en) | 1985-04-08 | 1985-04-08 | Refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7270185A JPS61231359A (en) | 1985-04-08 | 1985-04-08 | Refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61231359A JPS61231359A (en) | 1986-10-15 |
| JPH044504B2 true JPH044504B2 (en) | 1992-01-28 |
Family
ID=13496924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7270185A Granted JPS61231359A (en) | 1985-04-08 | 1985-04-08 | Refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61231359A (en) |
-
1985
- 1985-04-08 JP JP7270185A patent/JPS61231359A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61231359A (en) | 1986-10-15 |
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