JP2001241787A - Screw type refrigerator - Google Patents
Screw type refrigeratorInfo
- Publication number
- JP2001241787A JP2001241787A JP2000047448A JP2000047448A JP2001241787A JP 2001241787 A JP2001241787 A JP 2001241787A JP 2000047448 A JP2000047448 A JP 2000047448A JP 2000047448 A JP2000047448 A JP 2000047448A JP 2001241787 A JP2001241787 A JP 2001241787A
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- Prior art keywords
- temperature
- compressor
- winding
- screw
- motor
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は半密閉構造および
密閉構造のスクリュー式圧縮機を搭載した冷凍機に関す
る。The present invention relates to a refrigerator equipped with a screw compressor having a semi-hermetic structure and a hermetic structure.
【０００２】[0002]
【従来の技術】図４は従来のスクリュー冷凍機の冷媒回
路図である。図において、１は電動部１ａと圧縮動作を
するスクリューロータ部１ｂとから成るスクリュー式圧
縮機、２は冷却水管２ａと熱交換し凝縮作用をする水式
熱交換器、３は膨張弁、４はブライン配管５と熱交換し
蒸発作用をするブライン熱交換器で、前記スクリュー式
圧縮機１、水式熱交換器２および膨張弁３等と共に冷媒
配管６により連結されて冷媒回路を構成している。７は
制御装置で、前記ブライン配管５の入口管５ａ温度を検
出するブライン入口温度検出装置７ａ、および前記スク
リュー式圧縮機１の電動部１ａに設置され、巻線温度を
検出する巻線保護用サーモスタット７ｂを備えている。2. Description of the Related Art FIG. 4 is a refrigerant circuit diagram of a conventional screw refrigerator. In the figure, 1 is a screw compressor comprising an electric unit 1a and a screw rotor unit 1b which performs a compression operation, 2 is a water heat exchanger which exchanges heat with a cooling water pipe 2a to perform a condensation operation, 3 is an expansion valve, 4 Is a brine heat exchanger that exchanges heat with the brine pipe 5 and performs an evaporating action. The brine heat exchanger is connected to the screw type compressor 1, the water type heat exchanger 2, the expansion valve 3 and the like by the refrigerant pipe 6 to form a refrigerant circuit. I have. Reference numeral 7 denotes a control unit, which is installed in the brine inlet temperature detecting device 7a for detecting the temperature of the inlet pipe 5a of the brine pipe 5 and the motor unit 1a of the screw compressor 1, and is used for winding protection for detecting the winding temperature. A thermostat 7b is provided.
【０００３】次に、動作について説明する。図に示すよ
うに、スクリュー式圧縮機１、水式熱交換器２、膨張弁
３、ブライン熱交換器４および冷媒配管６により接続し
て冷媒回路を構成した冷凍機において、この冷凍機は、
ブライン入口温度検出装置７ａにより検出されるブライ
ン入口温度が制御装置７に伝えられ、制御装置７によっ
て、冷凍機の冷媒容量調節を行う。Next, the operation will be described. As shown in the figure, in a refrigerator configured by connecting a screw type compressor 1, a water type heat exchanger 2, an expansion valve 3, a brine heat exchanger 4, and a refrigerant pipe 6 to form a refrigerant circuit,
The brine inlet temperature detected by the brine inlet temperature detector 7a is transmitted to the controller 7, and the controller 7 adjusts the refrigerant capacity of the refrigerator.
【０００４】この容量調節はブライン入口温度信号を受
けた制御装置７により制御する。冷凍機は、ブライン入
口温度に応じ容量制御を行うが、負荷が減少しブライン
入口温度が制御目標温度以下となり、サーモ停止設定温
度まで達すると、サーモ停止となり自動的に圧縮機は停
止となる。この後、負荷が上昇し、ブライン入口温度が
サーモ復帰温度まで上昇すると、再度圧縮機の運転を開
始する。[0004] This capacity adjustment is controlled by a controller 7 which receives a brine inlet temperature signal. The refrigerator controls the capacity according to the brine inlet temperature. However, when the load decreases and the brine inlet temperature becomes equal to or lower than the control target temperature and reaches the thermo stop setting temperature, the thermo stop is performed and the compressor automatically stops. Thereafter, when the load rises and the brine inlet temperature rises to the thermoreturn temperature, the operation of the compressor is started again.
【０００５】また、図５は、特開平８−２９１９４６号
公報に示された従来のスクリュー式冷凍機の冷媒回路図
である。図において、１はスクリュー圧縮機、２は外気
と熱交換させ冷媒を凝縮させる空気熱交換器、４は冷水
管５の冷水と熱交換し冷媒を蒸発させる水熱交換器、７
は制御装置で、前記冷水管５出口管５ｂ温度を検知する
冷水温度検知装置７ａと、前記空気熱交換器入口管２ａ
の温度を検知する凝縮温度検知装置２ｂ、前記スクリュ
ー圧縮機１の冷媒吐出管６ａの凝縮圧力を検知する第１
凝縮圧力検知装置２ｃおよび、前記空気熱交換器２の冷
媒出口管６ｂの凝縮圧力を検知する第２凝縮圧力検知装
置２ｄを備えている。８は四方弁、９は前記空気熱交換
器２に外気を送りこむファン、１０はファン回転数を制
御するインバータ、１１は電磁弁である。FIG. 5 is a refrigerant circuit diagram of a conventional screw-type refrigerator disclosed in Japanese Patent Application Laid-Open No. Hei 8-291946. In the drawing, 1 is a screw compressor, 2 is an air heat exchanger for exchanging heat with outside air and condensing refrigerant, 4 is a water heat exchanger for exchanging heat with cold water in the cold water pipe 5 and evaporating the refrigerant, 7
Is a control device, a chilled water temperature detecting device 7a for detecting the temperature of the chilled water tube 5 outlet tube 5b, and the air heat exchanger inlet tube 2a.
Temperature detecting device 2b for detecting the temperature of the refrigerant, and a first pressure detecting device for detecting the condensing pressure of the refrigerant discharge pipe 6a of the screw compressor 1.
A condensing pressure detecting device 2c and a second condensing pressure detecting device 2d for detecting the condensing pressure of the refrigerant outlet pipe 6b of the air heat exchanger 2 are provided. 8 is a four-way valve, 9 is a fan for sending outside air to the air heat exchanger 2, 10 is an inverter for controlling the fan speed, and 11 is an electromagnetic valve.
【０００６】次に、このように構成された第２の従来例
のスクリュー式冷凍機の動作を説明する。２つの電磁弁
１１を有するスクリュー圧縮機１、ファン９を有する空
気熱交換器２、水式熱交換器４、及びそれらを冷媒配管
５で接続して回路を形成するスクリュー冷凍機におい
て、制御装置７は、スクリュー圧縮機１の冷媒吐出管６
ａの凝縮圧力を検出する第１凝縮圧力検知装置２ｃおよ
び空気熱交換器２の冷媒出口管６ｄの凝縮圧力を検知す
る第２凝縮圧力検知装置２ｅによりそれぞれ凝縮圧力を
検出して凝縮圧力が所定値（これを第一の設定値とす
る）になるように、空気熱交換器用のファン８を制御す
る。Next, the operation of the second conventional screw type refrigerator configured as described above will be described. In a screw compressor 1 having two solenoid valves 11, an air heat exchanger 2 having a fan 9, a water heat exchanger 4, and a screw refrigerator connected with a refrigerant pipe 5 to form a circuit, a control device is provided. 7 is a refrigerant discharge pipe 6 of the screw compressor 1
The first condensing pressure is detected by a first condensing pressure detecting device 2c for detecting the condensing pressure and a second condensing pressure detecting device 2e for detecting the condensing pressure of the refrigerant outlet pipe 6d of the air heat exchanger 2. The fan 8 for the air heat exchanger is controlled so that the value becomes the first set value.
【０００７】また、冷水管５出口管５ｂ温度を検出して
冷水温度が所定値になるように、圧縮機１を容量制御
し、かつ第１凝縮圧力検知装置２ｃおよび第２凝縮圧力
検知装置２ｅの凝縮圧力に前記第一の設定値より上に第
二の設定値を設け、この第二の設定値によって、圧縮機
１の容量制御を、冷水管５出口管５ｂ温度による制御に
優先して圧縮機１のロード電磁弁１０又はアンロード電
磁弁１０を制御するものである。[0007] The compressor 1 is controlled in capacity so that the temperature of the cold water pipe 5 is detected by detecting the temperature of the outlet pipe 5b of the cold water pipe 5, and the first condensing pressure detecting device 2c and the second condensing pressure detecting device 2e. A second set value is provided above the first set value for the condensing pressure, and the capacity control of the compressor 1 is performed by this second set value in preference to the control by the temperature of the outlet pipe 5b of the cold water pipe 5b. It controls the load solenoid valve 10 or the unload solenoid valve 10 of the compressor 1.
【０００８】[0008]
【発明が解決しようとする課題】これら、従来のスクリ
ュー式冷凍機は、以上のように構成されているので、負
荷が減少し、サーモ停止した場合、ブライン入口温度が
サーモ復帰設定温度まで上昇せねば運転を再開せず、負
荷の急激な上昇に対応できないという問題があった。Since these conventional screw refrigerators are constructed as described above, when the load is reduced and the thermostat is stopped, the brine inlet temperature rises to the thermoreset set temperature. There was a problem that it was not possible to cope with a sudden increase in load without restarting operation unless necessary.
【０００９】この発明は上記の問題を解決するためにな
されたもので、電動機へ複数の巻線サーモスタットを備
えた圧縮機を使用し、負荷の減少に伴い圧縮機の吸込み
冷媒ガス量が減少したことを、電動機巻線温度の上昇に
より検知し、サーモ停止を回避制御することによって、
冷凍機の連続運転を行い、負荷の急増にも遅滞なく対応
でき、かつブライン出口温度の安定した安価なスクリュ
ー冷凍機を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and uses a compressor having a plurality of winding thermostats for an electric motor, and the amount of refrigerant gas sucked into the compressor is reduced as the load is reduced. That is detected by the rise of the motor winding temperature, and by controlling the thermo stop to avoid,
It is an object of the present invention to provide an inexpensive screw refrigerator capable of continuously operating a refrigerator, coping with a sudden increase in load without delay, and having a stable brine outlet temperature.
【００１０】[0010]
【課題を解決するための手段】この発明のスクリュー式
冷凍機は、電動機部と圧縮動作をするスクリューロータ
部とから成るスクリュー式圧縮機、水式熱交換器、ブラ
イン配管を有するブライン熱交換器および膨張弁を冷媒
配管により連結接続した冷媒回路と、前記スクリュー式
圧縮機の電動機巻線温度の異常上昇を検知して圧縮機を
保護する巻線保護用サーモスタット等の巻線保護手段と
を備えたスクリュー式冷凍機において、前記巻線保護手
段とは検知温度を異にして電動機巻線温度の巻線保護設
定温度より低く設定した温度を検知し圧縮機連続運転を
継続させる圧縮機連続運転手段を設け、前記圧縮機連続
運転手段の信号により冷凍機の連続運転を制御する制御
手段を設けたものである。SUMMARY OF THE INVENTION A screw refrigerator of the present invention comprises a screw compressor comprising a motor section and a screw rotor section performing a compression operation, a water heat exchanger, and a brine heat exchanger having a brine pipe. And a refrigerant circuit in which an expansion valve is connected and connected by a refrigerant pipe, and winding protection means such as a winding protection thermostat for detecting an abnormal rise in the motor winding temperature of the screw type compressor to protect the compressor. In the screw type refrigerator, the compressor continuous operation means for detecting the temperature set lower than the winding protection set temperature of the motor winding temperature at a different detection temperature from the winding protection means and continuing the compressor continuous operation. And a control means for controlling the continuous operation of the refrigerator by a signal from the compressor continuous operation means.
【００１１】また、この発明のスクリュー式冷凍機は、
電動機部と圧縮動作をするスクリューロータ部とから成
るスクリュー式圧縮機、水式熱交換器、ブライン配管を
有するブライン熱交換器および膨張弁を冷媒配管により
連結接続した冷媒回路と、前記スクリュー式圧縮機の電
動機巻線温度の異常上昇を検知して圧縮機を保護する巻
線保護用サーモスタット等の巻線保護手段とを備えたス
クリュー式冷凍機において、ブライン配管の出口管温度
を検知するブライン出口温度検出手段と、前記巻線保護
手段とは検知温度を異にして電動機巻線温度の巻線保護
設定温度より低く設定した温度を検知し圧縮機連続運転
を継続させる圧縮機連続運転手段を設けた制御手段を備
え、この制御手段により圧縮機の容量調節を行うもので
ある。[0011] The screw refrigerator according to the present invention comprises:
A refrigerant circuit in which a screw compressor comprising a motor section and a screw rotor section performing a compression operation, a water heat exchanger, a brine heat exchanger having a brine pipe, and an expansion valve connected and connected by a refrigerant pipe; and Brine outlet for detecting the outlet pipe temperature of a brine pipe in a screw type refrigerator equipped with a winding protection means such as a winding protection thermostat for detecting an abnormal rise in the motor winding temperature of the machine and protecting the compressor. Temperature detection means, the winding protection means is provided with a compressor continuous operation means for detecting a temperature different from the detection temperature and lower than the winding protection set temperature of the motor winding temperature to continue the compressor continuous operation. Control means for adjusting the capacity of the compressor.
【００１２】[0012]
【発明の実施の形態】実施の形態１．以下、図１はこの
発明の実施の形態１によるスクリュー式冷凍機を示す冷
媒回路図である。図において、１は電動部１ａと圧縮動
作をするスクリューロータ部１ｂとから成るスクリュー
式圧縮機、２は冷却水管２ａと熱交換する水式熱交換
器、３は膨張弁、４はブライン配管５と熱交換するブラ
イン熱交換器で、前記スクリュー式圧縮機１、水式熱交
換器２および膨張弁３等と共に冷媒配管６により連結さ
れて冷媒回路を構成している。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a refrigerant circuit diagram showing a screw type refrigerator according to Embodiment 1 of the present invention. In the figure, 1 is a screw compressor comprising an electric unit 1a and a screw rotor unit 1b which performs a compression operation, 2 is a water heat exchanger which exchanges heat with a cooling water pipe 2a, 3 is an expansion valve, 4 is a brine pipe 5 This is a brine heat exchanger which exchanges heat with the screw type compressor 1, the water type heat exchanger 2, the expansion valve 3 and the like, and is connected by a refrigerant pipe 6 to form a refrigerant circuit.
【００１３】７は制御装置で、前記ブライン配管の出口
管５ｂ温度を検出し、圧縮機運転容量を連続的に低下さ
せるブライン出口温度検出装置７ｃ、および前記スクリ
ュー式圧縮機１の電動部１ａに設置され、巻線温度を検
出し保護する巻線保護手段である、例えば１０５℃で巻
線保護動作するよう設定された巻線保護用サーモスタッ
ト７ｂおよびこの巻線保護手段の設定温度よりは低く、
かつスクリュー式圧縮機を連続運転させる設定温度、例
えば７０℃から９０℃の範囲内の温度で連続運転を継続
させる圧縮機連続運転手段である圧縮機連続運転用サー
モスタット７ｄを備えている。Reference numeral 7 denotes a control unit which detects a temperature of the outlet pipe 5b of the brine pipe and continuously detects a brine outlet temperature detecting device 7c for lowering the compressor operating capacity, and a motor-driven unit 1a of the screw compressor 1. It is installed, and is a winding protection means for detecting and protecting the winding temperature, for example, a winding protection thermostat 7b set to perform a winding protection operation at 105 ° C. and a temperature lower than the set temperature of the winding protection means,
In addition, the compressor is provided with a compressor continuous operation thermostat 7d, which is a compressor continuous operation means for continuously operating the screw type compressor at a set temperature at which the screw type compressor is continuously operated, for example, at a temperature in the range of 70 ° C. to 90 ° C.
【００１４】次に、動作について説明する。冷凍機負荷
側の要求能力が低下するにしたがって、ブラインの出入
口温度差が減少する。ブライン出口温度検出装置７ｃに
よりブライン出口温度を検知し、この検出信号により制
御装置７が、圧縮機運転容量を絞りこみ圧縮機１の運転
容量を連続的に低下させる。この制御により冷凍機の冷
媒循環量が低下する。この圧縮機を駆動する電動機は冷
凍機を循環する冷媒ガスにより冷却されている。そのた
め、冷媒循環量が低下すると、必然的に電動機の冷却効
果が低下し電動機の温度を上昇させることとなる。Next, the operation will be described. As the required capacity on the refrigerator load side decreases, the difference between the inlet and outlet temperatures of the brine decreases. The brine outlet temperature is detected by the brine outlet temperature detecting device 7c, and the control device 7 narrows down the compressor operating capacity and continuously reduces the operating capacity of the compressor 1 based on this detection signal. By this control, the refrigerant circulation amount of the refrigerator decreases. The electric motor driving the compressor is cooled by the refrigerant gas circulating in the refrigerator. Therefore, when the amount of circulating refrigerant is reduced, the cooling effect of the motor is inevitably reduced, and the temperature of the motor is increased.
【００１５】この時、電動機１ａの巻線温度上昇限界の
巻線保護温度を、例えば１０５℃に設定しておき、ま
た、この巻線温度上昇温度より余裕を持たせた圧縮機連
続運転設定温度である、例えば７０℃から９０℃の範囲
の設定温度で作動するスクリュー式圧縮機連続運転用サ
ーモスタット７ｄが作動し、この信号をうけて圧縮機１
を連続運転させて圧縮機１の運転容量を上昇させる。At this time, the winding protection temperature at the winding temperature rise limit of the electric motor 1a is set to, for example, 105 ° C., and the compressor continuous operation set temperature with a margin larger than the winding temperature rise temperature. For example, the thermostat 7d for continuous operation of the screw type compressor which operates at a set temperature in the range of 70 ° C. to 90 ° C. operates, and upon receiving this signal, the compressor 1
Is operated continuously to increase the operating capacity of the compressor 1.
【００１６】次に、図２に示すスクリュー式冷凍機の制
御フローチャートを説明する。図において、始めに、ス
テップ１０１において、冷凍機の運転を開始する。運転
開始後ステップ１０２に進む。ステップ１０２では、ブ
ライン配管のブライン出口検出温度ＴAがブライン出口
設定温度ＴBと同じか小さい場合は、ステップ１０３に
進み、圧縮機の運転容量を減少させる。又、ステップ１
０２で、ブライン配管のブライン出口検出温度ＴAがブ
ライン出口設定温度ＴBより大きい場合は、ステップ１
０５に進み、圧縮機の運転容量を増大させる。ステップ
１０３で運転容量を減少させ冷凍機の冷媒循環量を低下
させると、必然的に電動機巻線の冷却効果が低下し電動
機巻線温度は上昇する。Next, a control flowchart of the screw type refrigerator shown in FIG. 2 will be described. In the figure, first, in step 101, the operation of the refrigerator is started. After the start of the operation, the process proceeds to step 102. In step 102, if the brine outlet detected temperature T A of the brine pipe is less than or equal brine outlet set temperature T B, the process proceeds to step 103, reducing the operating capacity of the compressor. Step 1
02, brine when the brine outlet detected temperature T A of the pipe is greater than the brine outlet set temperature T B is Step 1
Proceeding to 05, the operating capacity of the compressor is increased. When the operating capacity is reduced in step 103 to reduce the amount of refrigerant circulating in the refrigerator, the cooling effect of the motor winding is inevitably reduced, and the motor winding temperature increases.
【００１７】ステップ１０４で、圧縮機用電動機の巻線
温度Ｔが低温度側巻線サーモスタット設定温度ＴLと等
しいか、又は圧縮機用電動機の巻線温度Ｔが低温度側巻
線サーモスタット設定温度ＴLより大な場合は、ステッ
プ１０５に進み、圧縮機の運転容量を増大させる。、ス
テップ１０５で圧縮機の運転容量を増大させ冷媒循環量
を上昇させた後、ステップ１０６で圧縮機用電動機の巻
線温度Ｔが低温度側巻線サーモスタット設定温度ＴLよ
り小なる場合は、ステップ１０１に戻って当初の冷凍機
容量での運転を始める。又、ステップ１０６で圧縮機用
電動機の巻線温度Ｔが低温度側巻線サーモスタット設定
温度ＴLより小でない場合は、ステップ１０７で圧縮機
用電動機の巻線温度Ｔが高温度側巻線サーモスタット設
定温度Ｔ Hと等しいか、又は圧縮機用電動機の巻線温度
Ｔが高温度側巻線サーモスタット設定温度ＴHより大な
る場合は、ステップ１０８に進み冷凍機の運転を停止す
る。又、ステップ１０７で圧縮機用電動機の巻線温度Ｔ
が高温度側巻線サーモスタット設定温度ＴHより小なる
場合は、ステップ１０５に戻り圧縮機の運転容量を増大
させる運転をする。In step 104, the winding of the compressor motor
Temperature T is low temperature side winding thermostat set temperature TLAnd so on
Or the winding temperature T of the compressor motor is low
Line thermostat set temperature TLIf it is larger,
Proceeding to step 105, the operating capacity of the compressor is increased. ,
In step 105, the operating capacity of the compressor is increased and the refrigerant circulation amount is increased.
Is raised, and in step 106, the motor of the compressor is wound.
When the wire temperature T is the low temperature side winding thermostat set temperature TLYo
If smaller, return to step 101 to return to the original refrigerator
Start driving at capacity. Also, in step 106, for the compressor
Motor winding temperature T is set to low temperature side winding thermostat
Temperature TLIf not smaller than the compressor
The winding temperature T of the electric motor is set to the high temperature side winding thermostat.
Constant temperature T HEqual to or the winding temperature of the compressor motor
T is the high temperature side winding thermostat set temperature THBigger
If not, proceed to step 108 and stop the operation of the refrigerator.
You. Also, at step 107, the winding temperature T of the compressor motor is calculated.
Is the high temperature side winding thermostat set temperature THLess than
Return to step 105 to increase the operating capacity of the compressor.
Make driving.
【００１８】次に、図３に示す圧縮機容量制御特性図に
より圧縮機の運転容量と冷媒循環量との関係を説明す
る。この場合の運転条件は、凝縮温度／蒸発温度は一定
とする。図において、圧縮機運転容量を低下させた場
合、冷媒循環量の低下率は電気入力の低下率より大き
い。逆に、圧縮機運転容量を増大させた場合、冷媒循環
量の増大率は、電気入力の増大率より大きい。そのた
め、容量制御運転時に電動機温度が上昇した場合、圧縮
機の運転容量を増大させることで、電動機の冷却効果を
増大させることができる。即ち、冷媒循環量と電気入力
との交点Ｐ以上では電動機の冷却が良好に促進される
が、交点Ｐ以下では冷却不足となり冷却効果は期待でき
ない。Next, the relationship between the operating capacity of the compressor and the amount of circulating refrigerant will be described with reference to the compressor capacity control characteristic diagram shown in FIG. The operating condition in this case is that the condensation temperature / evaporation temperature is constant. In the figure, when the operating capacity of the compressor is reduced, the rate of decrease in the amount of circulating refrigerant is greater than the rate of decrease in the electrical input. Conversely, when the operating capacity of the compressor is increased, the increase rate of the refrigerant circulation amount is larger than the increase rate of the electric input. Therefore, when the motor temperature rises during the capacity control operation, the cooling effect of the motor can be increased by increasing the operating capacity of the compressor. That is, the cooling of the electric motor is favorably promoted above the intersection point P between the refrigerant circulation amount and the electric input, but the cooling effect is insufficient at the intersection point P or less due to insufficient cooling.
【００１９】[0019]
【発明の効果】以上に述べたように、この発明のスクリ
ュー式冷凍機は、電動機部と圧縮動作をするスクリュー
ロータ部とから成るスクリュー式圧縮機、水式熱交換
器、ブライン配管を有するブライン熱交換器および膨張
弁を冷媒配管により連結接続した冷媒回路と、前記スク
リュー式圧縮機の電動機巻線温度の異常上昇を検知して
圧縮機を保護する巻線保護用サーモスタット等の巻線保
護手段とを備えたスクリュー式冷凍機において、前記巻
線保護手段とは検知温度を異にして電動機巻線温度の巻
線保護設定温度より低く設定した温度を検知し圧縮機連
続運転を継続させる圧縮機連続運転手段を設け、前記圧
縮機連続運転手段の信号により冷凍機の連続運転を制御
する制御手段を設けた構成としたから、圧縮器の連続運
転を可能にし、負荷の急変にも迅速に追従する運転制御
ができ、かつ冷凍機の容量制御を安価に実現できる効果
を有する。As described above, the screw refrigerating machine of the present invention has a screw compressor comprising a motor section and a screw rotor section performing a compression operation, a water heat exchanger, and a brine having a brine pipe. A refrigerant circuit in which a heat exchanger and an expansion valve are connected and connected by a refrigerant pipe, and winding protection means such as a winding protection thermostat for detecting an abnormal rise in the motor winding temperature of the screw compressor and protecting the compressor. In the screw type refrigerator comprising: a compressor for detecting a temperature set lower than the winding protection set temperature of the motor winding temperature at a different detection temperature from the winding protection means and continuing the compressor continuous operation. Since the continuous operation means is provided and the control means for controlling the continuous operation of the refrigerator in accordance with the signal of the compressor continuous operation means is provided, the continuous operation of the compressor is enabled, Sudden change can also operation control to quickly follow the, and has a low cost can be effectively the capacity control of the refrigerator.
【００２０】また、この発明のスクリュー式冷凍機は、
電動機部と圧縮動作をするスクリューロータ部とから成
るスクリュー式圧縮機、水式熱交換器、ブライン配管を
有するブライン熱交換器および膨張弁を冷媒配管により
連結接続した冷媒回路と、前記スクリュー式圧縮機の電
動機巻線温度の異常上昇を検知して圧縮機を保護する巻
線保護用サーモスタット等の巻線保護手段とを備えたス
クリュー式冷凍機において、ブライン配管の出口管温度
を検知するブライン出口温度検出手段と、前記巻線保護
手段とは検知温度を異にして電動機巻線温度の巻線保護
設定温度より低く設定した温度を検知し圧縮機連続運転
を継続させる圧縮機連続運転手段を設けた制御手段を備
え、この制御手段により圧縮機の容量調節を行う構成と
したから、ブライン出口温度の安定した制御を可能とた
安価な冷凍機を提供できる効果を有する。Further, the screw type refrigerator of the present invention comprises:
A refrigerant circuit in which a screw compressor comprising a motor section and a screw rotor section performing a compression operation, a water heat exchanger, a brine heat exchanger having a brine pipe, and an expansion valve connected and connected by a refrigerant pipe; and Brine outlet for detecting the outlet pipe temperature of a brine pipe in a screw type refrigerator equipped with a winding protection means such as a winding protection thermostat for detecting an abnormal rise in the motor winding temperature of the machine and protecting the compressor. Temperature detection means, the winding protection means is provided with a compressor continuous operation means for detecting a temperature different from the detection temperature and lower than the winding protection set temperature of the motor winding temperature to continue the compressor continuous operation. The control unit has a configuration in which the capacity of the compressor is adjusted by this control unit. Therefore, an inexpensive refrigerator that enables stable control of the brine outlet temperature is provided. With the possible effect.
【図１】 この発明の実施の形態によるスクリュー式冷
凍機を示す冷媒回路図である。FIG. 1 is a refrigerant circuit diagram showing a screw type refrigerator according to an embodiment of the present invention.
【図２】 この発明の実施の形態によるスクリュー式冷
凍機の制御フローチャート図である。FIG. 2 is a control flowchart of the screw refrigerator according to the embodiment of the present invention.
【図３】 この発明の実施の形態によるスクリュー式冷
凍機の容量制御特性図である。FIG. 3 is a capacity control characteristic diagram of the screw refrigerator according to the embodiment of the present invention.
【図４】 従来のスクリュー式冷凍機を示す冷媒回路図
である。FIG. 4 is a refrigerant circuit diagram showing a conventional screw refrigerator.
【図５】 第２の従来例のによるスクリュー式冷凍機を
示す冷媒回路図である。FIG. 5 is a refrigerant circuit diagram showing a screw type refrigerator according to a second conventional example.
１ スクリュー圧縮機、１ａ 電動機、１ｂ スクリュ
ーロータ、２ 凝縮器、３ 膨張弁、４ 蒸発器、５
冷媒配管、７ 制御装置、７ｂ 巻線保護手段、６ｃ
圧縮機連続運転手段。Reference Signs List 1 screw compressor, 1a motor, 1b screw rotor, 2 condenser, 3 expansion valve, 4 evaporator, 5
Refrigerant pipe, 7 control device, 7b winding protection means, 6c
Compressor continuous operation means.
Claims (2)
ータ部とから成るスクリュー式圧縮機、水式熱交換器、
ブライン配管を有するブライン熱交換器および膨張弁を
冷媒配管により連結接続した冷媒回路と、前記スクリュ
ー式圧縮機の電動機巻線温度の異常上昇を検知して圧縮
機を保護する巻線保護用サーモスタット等の巻線保護手
段とを備えたスクリュー式冷凍機において、前記巻線保
護手段とは検知温度を異にして電動機巻線温度の巻線保
護設定温度より低く設定した温度を検知し圧縮機連続運
転を継続させる圧縮機連続運転手段を設け、前記圧縮機
連続運転手段の信号により冷凍機の連続運転を制御する
制御手段を設けたことを特徴とするスクリュー式冷凍
機。1. A screw compressor comprising a motor section and a screw rotor section performing a compression operation, a water heat exchanger,
A refrigerant circuit in which a brine heat exchanger and an expansion valve having a brine pipe are connected and connected by a refrigerant pipe, and a winding protection thermostat for protecting the compressor by detecting an abnormal rise in the motor winding temperature of the screw compressor and the like. In the screw refrigerator having the winding protection means, the compressor is operated continuously by detecting a temperature set lower than the winding protection set temperature of the motor winding temperature at a different temperature from the winding protection means. And a control means for controlling continuous operation of the refrigerator in accordance with a signal from the compressor continuous operation means.
ータ部とから成るスクリュー式圧縮機、水式熱交換器、
ブライン配管を有するブライン熱交換器および膨張弁を
冷媒配管により連結接続した冷媒回路と、前記スクリュ
ー式圧縮機の電動機巻線温度の異常上昇を検知して圧縮
機を保護する巻線保護用サーモスタット等の巻線保護手
段とを備えたスクリュー式冷凍機において、ブライン配
管の出口管温度を検知するブライン出口温度検出手段
と、前記巻線保護手段とは検知温度を異にして電動機巻
線温度の巻線保護設定温度より低く設定した温度を検知
し圧縮機連続運転を継続させる圧縮機連続運転手段を設
けた制御手段を備え、この制御手段により圧縮機の容量
調節を行うことを特徴とするスクリュー式冷凍機。2. A screw compressor comprising a motor section and a screw rotor section performing a compression operation, a water heat exchanger,
A refrigerant circuit in which a brine heat exchanger and an expansion valve having a brine pipe are connected and connected by a refrigerant pipe, and a winding protection thermostat for protecting the compressor by detecting an abnormal rise in the motor winding temperature of the screw compressor and the like. In the screw type refrigerator provided with the winding protection means, a brine outlet temperature detection means for detecting an outlet pipe temperature of the brine pipe, and the winding protection means has a different detection temperature so that the winding of the motor winding temperature is different. A screw type comprising a control means provided with a compressor continuous operation means for detecting a temperature set lower than the line protection set temperature and continuing the compressor continuous operation, and adjusting the capacity of the compressor by this control means. refrigerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000047448A JP4318369B2 (en) | 2000-02-24 | 2000-02-24 | Screw type refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000047448A JP4318369B2 (en) | 2000-02-24 | 2000-02-24 | Screw type refrigerator |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2001241787A true JP2001241787A (en) | 2001-09-07 |
| JP2001241787A5 JP2001241787A5 (en) | 2006-11-09 |
| JP4318369B2 JP4318369B2 (en) | 2009-08-19 |
Family
ID=18569697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000047448A Expired - Lifetime JP4318369B2 (en) | 2000-02-24 | 2000-02-24 | Screw type refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4318369B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006307720A (en) * | 2005-04-27 | 2006-11-09 | Toyota Industries Corp | Electric motor control device of electric compressor |
| CN113639452A (en) * | 2020-04-27 | 2021-11-12 | 青岛海尔空调电子有限公司 | Compressor control method for heat exchange system |
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| CN113639452A (en) * | 2020-04-27 | 2021-11-12 | 青岛海尔空调电子有限公司 | Compressor control method for heat exchange system |
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|---|---|
| JP4318369B2 (en) | 2009-08-19 |
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