JPH05141791A - Refrigerating device - Google Patents
Refrigerating deviceInfo
- Publication number
- JPH05141791A JPH05141791A JP3303170A JP30317091A JPH05141791A JP H05141791 A JPH05141791 A JP H05141791A JP 3303170 A JP3303170 A JP 3303170A JP 30317091 A JP30317091 A JP 30317091A JP H05141791 A JPH05141791 A JP H05141791A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- compressor
- valve
- opening degree
- expansion valve
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スーパーショーケー
ス、冷蔵庫、恒温槽等に使用される冷凍装置に係わり、
特に庫内の温度制御に高い精度が要求される冷凍装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating device used in super showcases, refrigerators, constant temperature baths, etc.
In particular, the present invention relates to a refrigerating apparatus that requires high accuracy in temperature control inside a refrigerator.
【０００２】[0002]
【従来の技術】従来、この種の冷凍装置として例えば実
公昭５８−４８９８７号公報に記載されたものがある。
この冷凍装置は図６に示すように、圧縮機１、凝縮器
２、温度式の膨張弁３、冷却器４が配管５によって連結
されてなり、蒸発器４近傍には送風機６が、また蒸発器
４の出口側配管５には感温筒７が配されている。この冷
凍装置の動作は、例えば蒸発器４内の液状冷媒の温度が
下がれば、感温筒７の温度が低下し、これが所定温度以
下になった場合には送風機６を送風強度が高まるよう作
動させて庫内温度が一定になるようにしている。2. Description of the Related Art Conventionally, as a refrigerating apparatus of this type, there is one described in Japanese Utility Model Publication No. 58-48987.
As shown in FIG. 6, this refrigeration system includes a compressor 1, a condenser 2, a temperature type expansion valve 3 and a cooler 4 which are connected by a pipe 5, and a blower 6 and an evaporator are provided near the evaporator 4. A temperature sensitive tube 7 is arranged in the outlet side pipe 5 of the container 4. The operation of this refrigerating device operates so that, for example, if the temperature of the liquid refrigerant in the evaporator 4 decreases, the temperature of the temperature-sensitive cylinder 7 decreases, and if it falls below a predetermined temperature, the blower 6 increases the blowing strength. The temperature inside the refrigerator is kept constant.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記冷凍
装置では庫内の温度制御をするのに感温筒７で配管５内
の冷媒温度を検出して行うこととされているので庫内の
温度に対しては間接的な制御となっていた。従って、冷
媒温度や圧力の変化に対する応答は速いが、庫内の空気
温度の変化に対しては、まず蒸発器４のフィンの温度が
変化し、次に冷媒の温度が変化し、つづいて感温筒７の
温度が変化するといった具合に応答が遅く、庫内温度を
設定温度から例えば±０．５〜１℃の範囲で制御すると
いう高い精度の温度制御は困難であるなどの問題があっ
た。また、圧縮機停止後の再起動時に、冷却負荷が少な
い場合、急激に庫内温度が低下して圧縮機が停止し、圧
縮機が運転・停止をくりかえすという問題があった。圧
縮機停止後の再起動時に、膨張弁の開度が小さく、圧縮
機の吸入圧力が急激に低下し、圧縮機が停止したり、逆
に膨張弁の開度が大きく、圧縮機へ多量の液がもどって
きて過電流保護器等が作動し、圧縮機が停止するという
問題があった。However, in the above refrigerating apparatus, the temperature inside the refrigerator is controlled by detecting the temperature of the refrigerant inside the pipe 5 to control the temperature inside the refrigerator. On the other hand, it was an indirect control. Therefore, the response to changes in the refrigerant temperature and pressure is fast, but to the changes in the air temperature inside the refrigerator, the temperature of the fins of the evaporator 4 changes first, and then the temperature of the refrigerant changes, and then the feeling. There is a problem that the response is slow such that the temperature of the warm cylinder 7 changes, and it is difficult to control the temperature inside the refrigerator within a range of ± 0.5 to 1 ° C. from the set temperature with high accuracy. It was Further, when the cooling load is small at the time of restarting after the compressor is stopped, there is a problem that the temperature inside the refrigerator suddenly drops and the compressor stops, and the compressor is repeatedly operated and stopped. When restarting after the compressor is stopped, the opening of the expansion valve is small, the suction pressure of the compressor drops sharply, the compressor stops, and on the contrary, the opening of the expansion valve is large and a large amount of air flows to the compressor. There was a problem that the liquid returned and the overcurrent protector etc. actuated and the compressor stopped.
【０００４】この発明は上記のような問題を解決すべ
く、庫内の温度変化に対する冷凍装置の応答を速め、庫
内温度を変動の少ない高い精度で制御できるとともに、
圧縮機の運転・停止の少ない冷凍装置を得ることを目的
としている。In order to solve the above problems, the present invention speeds up the response of the refrigeration system to changes in the temperature inside the refrigerator, and can control the temperature inside the refrigerator with high accuracy and little fluctuation.
The objective is to obtain a refrigeration system with few compressor starts / stops.
【０００５】[0005]
【課題を解決するための手段】この発明は、圧縮機、凝
縮器、減圧装置、蒸発器が配管で連結されてなる冷媒流
路を持つ冷凍装置において、この冷媒流路途中に前記蒸
発器内の冷媒流量を調節する電動弁が配され、前記蒸発
器近傍には蒸発器の周囲温度を検出して温度検出信号を
発生する温度検出部が配され、前記温度検出信号と所定
の設定温度に対応する基準値とを比較し両者の差に応じ
た信号を発生する温度比較部と、前記温度比較部の信号
によって前記電動弁の開度を制御する弁開度制御部およ
び前記圧縮機停止後の再起動時、前記電動弁の開度を
［前記圧縮機停止時の値］＋［所定値］とする弁開度補
正部、上記［所定値］を［前記圧縮機停止時の値］によ
って決定する所定値決定部とを設けたものである。SUMMARY OF THE INVENTION The present invention relates to a refrigerating apparatus having a refrigerant flow path in which a compressor, a condenser, a pressure reducing device, and an evaporator are connected by piping, and the inside of the evaporator is provided in the refrigerant flow path. A motor-operated valve for adjusting the refrigerant flow rate is disposed, and a temperature detection unit that detects the ambient temperature of the evaporator and generates a temperature detection signal is disposed near the evaporator, and the temperature detection signal and a predetermined set temperature are set. After comparing the corresponding reference value with a temperature comparison unit that generates a signal according to the difference between them, a valve opening control unit that controls the opening of the electrically operated valve by the signal of the temperature comparison unit, and after the compressor is stopped When restarting, the valve opening correction unit that sets the opening of the motor-operated valve to [the value when the compressor is stopped] + [predetermined value], and the [predetermined value] by the [value when the compressor is stopped] A predetermined value determination unit for determining is provided.
【０００６】また、冷媒流路を構成する減圧装置を電子
式膨張弁とし、前記電子式膨張弁を前記電動弁と前記圧
縮機との間の吸入配管の温度と前記吸入配管内の圧力に
相当する飽和温度との差が所定の値になるように制御す
る電子式膨張弁制御装置と前記圧縮機起動時、前記電子
式膨張弁の開度を前記圧縮機停止時の開度に対し１を越
える所定倍の開度で起動し、所定時間後に前記圧縮機停
止時の開度になるように制御する電子式膨張弁弁開度補
正部とを設ける。The pressure reducing device constituting the refrigerant flow path is an electronic expansion valve, and the electronic expansion valve corresponds to the temperature of the suction pipe between the motor-operated valve and the compressor and the pressure in the suction pipe. The electronic expansion valve control device that controls so that the difference between the saturation temperature and the saturation temperature becomes a predetermined value, and when the compressor is started, the opening degree of the electronic expansion valve is set to 1 with respect to the opening degree when the compressor is stopped. An electronic expansion valve valve opening degree correction unit is provided which is started at an opening degree that exceeds a predetermined times and is controlled to reach the opening degree when the compressor is stopped after a predetermined time.
【０００７】[0007]
【作用】この発明における冷凍装置は、蒸発器付近の温
度を温度検出器で検出し、その検出信号を基に設定温度
との比較を行い、その結果を基に弁開度の確定値を出力
するとともに、圧縮機停止後の再起動時は弁開度の確定
値を［圧縮機停止時の値］＋所定値決定部によって決定
される［所定値］として出力し、この出力に応じて冷媒
流路途中に設けられた電動弁の開度が調節されることに
より温度制御する。In the refrigerating apparatus according to the present invention, the temperature near the evaporator is detected by the temperature detector, the detected signal is compared with the set temperature, and the determined value of the valve opening is output based on the result. In addition, when restarting after the compressor is stopped, the definite value of the valve opening is output as [value when the compressor is stopped] + [predetermined value] determined by the predetermined value determination unit, and the refrigerant is output according to this output. The temperature is controlled by adjusting the opening of a motor-operated valve provided in the middle of the flow path.
【０００８】また、この発明における冷凍装置は、減圧
装置を電子式膨張弁とし、前記電子式膨張弁を前記電動
弁と前記圧縮機との間の吸入配管の温度と前記吸入配管
内の圧力に相当する飽和温度との差が所定の値になるよ
うに制御する電子式膨張弁制御装置と前記圧縮機起動
時、前記電子式膨張弁の開度を前記圧縮機停止時の開度
に対し１を越える所定倍の開度で起動し、所定時間後に
前記圧縮機停止時の開度になるように制御する電子式膨
張弁弁開度補正部とにより、電子式膨張弁の開度を調節
する。Further, in the refrigerating apparatus according to the present invention, the pressure reducing device is an electronic expansion valve, and the electronic expansion valve controls the temperature of the suction pipe between the electric valve and the compressor and the pressure in the suction pipe. An electronic expansion valve control device that controls the difference from the corresponding saturation temperature to be a predetermined value, and the opening degree of the electronic expansion valve when the compressor is started is 1 with respect to the opening degree when the compressor is stopped. The opening degree of the electronic expansion valve is adjusted by the electronic expansion valve opening degree correction unit that starts at a predetermined opening degree that exceeds ..
【０００９】[0009]
実施例１．以下、この発明の一実施例を図に基づき説明
する。図１はこの発明に係わる冷凍装置を示す回路図で
あり、この冷媒回路は圧縮機１、凝縮器２、膨張弁３、
蒸発器４が配管５によって連結され、蒸発器４の出口側
には従来と同様、感温筒７が配されており、この感温筒
７は膨張弁３に連結されてこの膨張弁３の開度を調節
し、また蒸発器４の近傍には送風機６が配されている。
蒸発器４の近傍には第１の温度検出器８が配されてお
り、蒸発器４の周囲温度を検出する。９は温度比較部で
あり、第１の温度検出器８からの温度検出信号と所定の
設定温度に対応して設定される基準値とを比較する比較
部（図示せず）を内蔵し、前記温度検出信号と基準値と
を比較し、その差Ｔに応じた信号を発生する。１０は、
弁開度制御部であって、前記温度比較部９からの信号に
応じて、電動弁１２の弁開度Ｗを制御する。また、１１
は弁開度補正部であって、前記圧縮機１停止後の再起動
時、電動弁１２の弁開度Ｗを［前記圧縮機１停止時の
値］＋所定値決定部２０によって決定される［所定値］
とするものである。この電動弁１２は蒸発器４の出口側
の配管に設けられ、蒸発器４内を流れる冷媒流量を調節
する。なお所定値決定部２０は、前記［所定値］を圧縮
機１停止時の値によって決定するものである。Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a refrigerating device according to the present invention. This refrigerant circuit includes a compressor 1, a condenser 2, an expansion valve 3,
The evaporator 4 is connected by a pipe 5, and a temperature-sensitive tube 7 is arranged on the outlet side of the evaporator 4 as in the conventional case. The temperature-sensitive tube 7 is connected to the expansion valve 3 and the expansion valve 3 is connected to the expansion valve 3. A blower 6 is arranged in the vicinity of the evaporator 4 for adjusting the opening degree.
A first temperature detector 8 is arranged near the evaporator 4 and detects the ambient temperature of the evaporator 4. Reference numeral 9 denotes a temperature comparison unit, which has a built-in comparison unit (not shown) for comparing the temperature detection signal from the first temperature detector 8 with a reference value set corresponding to a predetermined set temperature. The temperature detection signal and the reference value are compared and a signal corresponding to the difference T is generated. 10 is
The valve opening control unit controls the valve opening W of the motor-operated valve 12 according to the signal from the temperature comparison unit 9. Also, 11
Is a valve opening degree correction unit, and determines the valve opening degree W of the motor-operated valve 12 by [value when the compressor 1 is stopped] + predetermined value determination unit 20 when restarting after the compressor 1 is stopped. [Predetermined value]
It is what The motor-operated valve 12 is provided in a pipe on the outlet side of the evaporator 4 and regulates the flow rate of the refrigerant flowing in the evaporator 4. The predetermined value determination unit 20 determines the [predetermined value] based on the value when the compressor 1 is stopped.
【００１０】上記冷凍装置においては庫内の温度が所定
の温度と比較して高いか低いかにより、又その温度変化
の度合いにより電動弁１２の開度を調節して蒸発器４内
を流れる冷媒流量を制御することにより庫内の温度変化
に迅速に対応するものである。In the above refrigerating apparatus, the refrigerant flowing in the evaporator 4 is adjusted depending on whether the temperature inside the refrigerator is higher or lower than a predetermined temperature, and the degree of change of the temperature to adjust the opening degree of the electric valve 12. By controlling the flow rate, it is possible to respond quickly to changes in the temperature inside the refrigerator.
【００１１】図２に冷凍装置の弁開度制御部１０、弁開
度補正部１１の制御動作手順を示すフローチャートを示
す。前記電動弁１２の開度調節のための弁開度制御部１
０より出力される確定値は、前記温度比較部９からの信
号に基づいている。すなわち、図２においてステップＳ
２１で圧縮機１が再起動時でない時、ステップＳ２３に
進む。ステップＳ２３において、前記温度比較部９よ
り、庫内温度が所定の温度より高いという信号が入力さ
れた場合、ステップＳ２４に進み、前記弁開度制御部１
０より、前記電動弁１２の弁開度Ｗを一定量△Ｗ増加さ
せるように前記電動弁１２に出力される。逆に、ステッ
プＳ２３において、前記温度比較部９より、庫内温度が
所定の温度より低いという信号が入力された場合、ステ
ップＳ２５に進み、前記電動弁１２の弁開度Ｗを一定量
△Ｗ減少させるように前記電動弁１２に出力される。FIG. 2 is a flowchart showing the control operation procedure of the valve opening control unit 10 and the valve opening correction unit 11 of the refrigeration system. A valve opening control unit 1 for adjusting the opening of the motor-operated valve 12.
The fixed value output from 0 is based on the signal from the temperature comparison unit 9. That is, step S in FIG.
If the compressor 1 is not restarted at 21, the process proceeds to step S23. In step S23, if a signal indicating that the internal cold storage temperature is higher than the predetermined temperature is input from the temperature comparison unit 9, the process proceeds to step S24, and the valve opening control unit 1
From 0, it is output to the electric valve 12 so as to increase the valve opening W of the electric valve 12 by a fixed amount ΔW. On the contrary, in step S23, when a signal indicating that the internal cold storage temperature is lower than the predetermined temperature is input from the temperature comparison unit 9, the process proceeds to step S25, and the valve opening degree W of the motor-operated valve 12 is set to a fixed amount ΔW. It is output to the motor-operated valve 12 so as to decrease.
【００１２】また、図２において、ステップＳ２１で圧
縮機１が再起動時の場合、ステップＳ２２に進み、前記
弁開度補正部１１の作用により、前記電動弁１２の弁開
度は［圧縮機１停止時の値］＋所定値決定部２０によっ
て決定される［所定値］により運転される。Further, in FIG. 2, when the compressor 1 is restarted in step S21, the process proceeds to step S22, in which the valve opening correction unit 11 operates so that the valve opening of the electric valve 12 is [compressor]. 1 stop value] + [predetermined value] determined by the predetermined value determination unit 20.
【００１３】図３に冷凍装置の所定値決定部２０の制御
動作手順を示すフローチャートを示す。前記所定値決定
部２０より出力される確定値は、前記圧縮機１停止時の
弁開度からの信号に基づいている。すなわち、図３にお
いてステップＳ３１に圧縮機停止時の弁開度がＷ1 以上
の場合、ステップＳ３２に進み、所定値は△Ｗ1 とな
る。また、ステップＳ３１において圧縮機停止時の弁開
度がＷ1 未満の場合、ステップＳ３３に進む。ステップ
Ｓ３３において、圧縮機停止時の弁開度がＷ2 以上の場
合、ステップＳ３４に進み、所定値は△Ｗ2 となる。ス
テップＳ３３において、圧縮機停止時の弁開度がＷ2 未
満の場合、ステップＳ３５に進み、所定値は△Ｗ3 とな
る。なお、本実施例では、所定値決定部２０によって所
定値を３段階にわけたが、それ以上でも以下でも同様な
方法により決定することができる。FIG. 3 is a flow chart showing a control operation procedure of the predetermined value determination unit 20 of the refrigeration system. The fixed value output from the predetermined value determination unit 20 is based on a signal from the valve opening degree when the compressor 1 is stopped. That is, in FIG. 3, when the valve opening degree when the compressor is stopped is W 1 or more in step S31, the process proceeds to step S32 and the predetermined value is ΔW 1 . If the valve opening when the compressor is stopped is less than W 1 in step S31, the process proceeds to step S33. In step S33, when the valve opening degree when the compressor is stopped is W 2 or more, the process proceeds to step S34, and the predetermined value becomes ΔW 2 . In step S33, when the valve opening degree when the compressor is stopped is less than W 2 , the process proceeds to step S35 and the predetermined value becomes ΔW 3 . In the present embodiment, the predetermined value determination unit 20 divides the predetermined value into three levels, but the predetermined value can be determined by the same method above or below.
【００１４】なお、本発明は膨張弁３に感温筒７が連結
されている場合について説明したが、電子式膨張弁にお
いても同様の効果が得られる。Although the present invention has been described with respect to the case where the temperature sensing cylinder 7 is connected to the expansion valve 3, the same effect can be obtained with an electronic expansion valve.
【００１５】実施例２．図４はこの発明の実施例２にお
ける冷凍装置の回路構成を示す図である。図に示すよう
に、図１における実施例１の膨張弁３のかわりに、電子
式膨張弁１９を設けている。１７は、電動弁１２と圧縮
機１との間を連通する吸入配管、１３はこの吸入配管１
７の温度を検出する第２の温度検出器、１８は電子式膨
張弁１９の入口液管から吸入配管１７に連通する絞り装
置、１４はこの絞り装置１８を出た直後の温度（吸入配
管１７の圧力に相当する飽和温度）を検出する第３の温
度検出器である。１５は、上記第２の温度検出器１３で
検出された温度と上記第３の温度検出器１４で検出され
た温度との差が所定の値になるように上記電子式膨張弁
１９を制御する電子式膨張弁制御装置である。また、１
６は、上記圧縮機１起動時、上記電子式膨張弁１９の開
度を圧縮機１休止時の開度に対し１を越える所定倍の開
度で起動し、所定時間後に圧縮機１の休止時の開度にな
るように制御する電子式膨張弁弁開度補正部である。Example 2. FIG. 4 is a diagram showing a circuit configuration of a refrigeration system according to Embodiment 2 of the present invention. As shown in the figure, an electronic expansion valve 19 is provided instead of the expansion valve 3 of the first embodiment in FIG. Reference numeral 17 denotes a suction pipe that connects the motor-operated valve 12 and the compressor 1, and 13 denotes the suction pipe 1.
7 is a second temperature detector for detecting the temperature of 7, 7 is a throttle device communicating from the inlet liquid pipe of the electronic expansion valve 19 to the suction pipe 17, and 14 is the temperature immediately after the throttle device 18 (the suction pipe 17 Is a third temperature detector for detecting a saturation temperature corresponding to the pressure of. Reference numeral 15 controls the electronic expansion valve 19 so that the difference between the temperature detected by the second temperature detector 13 and the temperature detected by the third temperature detector 14 becomes a predetermined value. It is an electronic expansion valve control device. Also, 1
Reference numeral 6 indicates that when the compressor 1 is started, the opening degree of the electronic expansion valve 19 is started at a predetermined multiple of more than 1 with respect to the opening degree when the compressor 1 is stopped, and the compressor 1 is stopped after a predetermined time. It is an electronic expansion valve valve opening degree correction unit that controls so that the opening degree becomes equal to the time.
【００１６】上記冷凍装置においては庫内の温度が所定
の温度と比較して高いか低いかにより、電動弁１２の開
度を調節して蒸発器４内を流れる冷媒流量を制御するこ
とにより庫内の温度変化に迅速に対応するものである。In the above refrigerating apparatus, the opening of the electric valve 12 is adjusted to control the flow rate of the refrigerant flowing in the evaporator 4 depending on whether the temperature inside the refrigerator is higher or lower than a predetermined temperature. It quickly responds to internal temperature changes.
【００１７】図５に冷凍装置の電子式膨張弁制御装置１
５、電子式膨張弁弁開度補正部１６の制御動作手順を示
すフローチャートを示す。上記電子式膨張弁１９の開度
調節のための電子式膨張弁制御装置１５より出力される
確定値は、上記第２の温度検出器１３で検出された温度
と上記第３の温度検出器１４で検出された温度との差
（ＳＨ１）に基づいている。すなわち、図５においてス
テップＳ４１で圧縮機１が再起動時でない時、ステップ
Ｓ４３に進む。ステップＳ４３において、上記第２の温
度検出器１３で検出された温度と上記第３の温度検出器
１４で検出された温度との差（ＳＨ１）が所定の値より
高いという信号が入力された場合、ステップＳ４４に進
み、上記電子式膨張弁制御装置１５より、上記電子式膨
張弁１９の弁開度Ｇを一定量△Ｇ増加させるように上記
電子式膨張弁１９に出力される。逆に、ステップＳ４３
において、上記第２の温度検出器１３で検出された温度
と上記第３の温度検出器１４で検出された温度との差
（ＳＨ１）が所定の値より低いという信号が入力された
場合、ステップＳ４５に進み、上記電子式膨張弁制御装
置１５より、上記電子式膨張弁１９の弁開度Ｇを一定量
△Ｇ減少させるように上記電子式膨張弁１９に出力され
る。FIG. 5 shows an electronic expansion valve control device 1 for a refrigeration system.
5 is a flowchart showing a control operation procedure of the electronic expansion valve valve opening degree correction unit 16. The definite value output from the electronic expansion valve control device 15 for adjusting the opening degree of the electronic expansion valve 19 is the temperature detected by the second temperature detector 13 and the third temperature detector 14. It is based on the difference (SH1) from the temperature detected in. That is, in FIG. 5, when the compressor 1 is not restarted in step S41, the process proceeds to step S43. In step S43, when a signal that the difference (SH1) between the temperature detected by the second temperature detector 13 and the temperature detected by the third temperature detector 14 is higher than a predetermined value is input. Then, in step S44, the electronic expansion valve control device 15 outputs the electronic expansion valve 19 to the electronic expansion valve 19 so as to increase the valve opening degree G of the electronic expansion valve 19 by a predetermined amount ΔG. Conversely, step S43
In the step, when a signal that the difference (SH1) between the temperature detected by the second temperature detector 13 and the temperature detected by the third temperature detector 14 is lower than a predetermined value is input, Proceeding to S45, the electronic expansion valve control device 15 outputs to the electronic expansion valve 19 so as to decrease the valve opening degree G of the electronic expansion valve 19 by a fixed amount ΔG.
【００１８】また、図５において、ステップＳ４１で圧
縮機１が再起動時の場合、ステップＳ４２に進み、上記
電子式膨張弁弁開度補正部１６の作用により、上記電子
式膨張弁１９の弁開度は圧縮機１休止時の開度に対し１
を越える所定倍の開度で起動し、所定時間後に圧縮機１
の休止時の開度になるように運転される。Further, in FIG. 5, when the compressor 1 is restarted in step S41, the process proceeds to step S42, and the operation of the electronic expansion valve valve opening correction section 16 causes the valve of the electronic expansion valve 19 to operate. The opening is 1 with respect to the opening when the compressor 1 is stopped.
The compressor 1 is started at a predetermined opening that exceeds
The operation is performed so that the opening degree at the time of rest is reached.
【００１９】なお、本発明は、電子式膨張弁１９の入口
液管から吸入配管１７に連通する絞り装置１８を設け、
この絞り装置１８を出た直後の温度（吸入配管１７の圧
力に相当する飽和温度）を第３の温度検出器１４で検出
しているが、上記吸入配管１７に圧力センサーを設け、
圧力を検出し、その圧力値を温度に変換してもよい。The present invention is provided with a throttle device 18 which communicates from the inlet liquid pipe of the electronic expansion valve 19 to the suction pipe 17,
The temperature immediately after exiting the expansion device 18 (saturation temperature corresponding to the pressure of the suction pipe 17) is detected by the third temperature detector 14, but a pressure sensor is provided in the suction pipe 17,
The pressure may be detected and the pressure value may be converted into temperature.
【００２０】[0020]
【発明の効果】この発明は、以上のように構成されてい
るので、温度検出器によって蒸発器付近の温度を直接検
出し、この検出信号を基に設定温度との比較を行い、そ
の結果を基に弁開度の確定値を出力するとともに、圧縮
機停止後の再起動時は弁開度の確定値を［圧縮機停止時
の値］＋所定値決定部によって決定される［所定値］と
して出力し、この出力に応じて冷媒流路途中に設けられ
た電動弁の開度が調節される。従って冷凍庫内等の空気
温度の変化に対する温度制御の応答が速められ、冷凍庫
内等の温度が変動の少ない高い精度で制御される。Since the present invention is constituted as described above, the temperature around the evaporator is directly detected by the temperature detector, the temperature is compared with the set temperature based on this detection signal, and the result is compared. Based on this, a fixed value of the valve opening is output, and when restarting after the compressor is stopped, the fixed value of the valve opening is determined by [value when the compressor is stopped] + predetermined value determination unit [predetermined value] And the opening degree of the electrically operated valve provided in the middle of the refrigerant flow path is adjusted according to the output. Therefore, the response of the temperature control to the change of the air temperature in the freezer or the like is accelerated, and the temperature in the freezer or the like is controlled with high accuracy with little fluctuation.
【００２１】また、この発明は以上のように構成されて
いるので、電子式膨張弁を電動弁と圧縮機との間の吸入
配管の温度と吸入配管内の圧力に相当する飽和温度との
差が所定の値になるように制御する電子式膨張弁制御装
置と圧縮機起動時、電子式膨張弁の開度を、前記圧縮機
停止時の開度に対し１を越える所定倍の開度で起動し、
所定時間後に前記圧縮機休止時の開度になるように制御
する電子式膨張弁弁開度補正部とにより、電子式膨張弁
の開度は調節される。したがって、圧縮機停止後の再起
動時においても、圧縮機の吸入圧力が急激に低下し、圧
縮機が停止したり、逆に圧縮機へ多量の液がもどってき
て過電流保護器等が作動し、圧縮機が停止することがな
い。Further, since the present invention is configured as described above, the difference between the temperature of the suction pipe between the electronic expansion valve and the compressor and the saturation temperature corresponding to the pressure in the suction pipe is set. When the compressor is started, the opening degree of the electronic expansion valve is set to a predetermined multiple of more than 1 with respect to the opening degree when the compressor is stopped. Start up,
The opening degree of the electronic expansion valve is adjusted by an electronic expansion valve opening degree correction unit that controls the opening degree when the compressor is stopped after a predetermined time. Therefore, even when the compressor is restarted after it is stopped, the suction pressure of the compressor suddenly drops and the compressor stops, or conversely a large amount of liquid returns to the compressor and the overcurrent protector etc. operates. However, the compressor never stops.
【図１】この発明の実施例１を示す冷凍装置の冷媒回路
図である。FIG. 1 is a refrigerant circuit diagram of a refrigeration system showing Embodiment 1 of the present invention.
【図２】図１に示す冷凍装置の弁開度制御部、弁開度補
正部の制御動作手順を示すフローチャートである。FIG. 2 is a flowchart showing a control operation procedure of a valve opening control unit and a valve opening correction unit of the refrigeration system shown in FIG.
【図３】図１に示す冷凍装置の所定値決定部の制御動作
手順を示すフローチャートである。3 is a flowchart showing a control operation procedure of a predetermined value determination unit of the refrigerating apparatus shown in FIG.
【図４】この発明の実施例２を示す冷凍装置の冷媒回路
図である。FIG. 4 is a refrigerant circuit diagram of a refrigeration system showing Embodiment 2 of the present invention.
【図５】図４に示す冷凍装置の電子式膨張弁制御装置、
電子式膨張弁弁開度補正部の制御動作手順を示すフロー
チャートである。5 is an electronic expansion valve control device for the refrigeration system shown in FIG. 4,
It is a flow chart which shows a control operation procedure of an electronic expansion valve valve opening amendment part.
【図６】従来例を示す冷凍装置の冷媒回路図である。FIG. 6 is a refrigerant circuit diagram of a refrigeration apparatus showing a conventional example.
１ 圧縮機 ２ 凝縮器 ３ 膨張弁 ４ 蒸発器 ５ 配管 ８ 第１の温度検出部 ９ 温度比較部 １０ 弁開度制御部 １１ 弁開度補正部 １２ 電動弁 １３ 第２の温度検出器 １４ 第３の温度検出器 １５ 電子式膨張弁制御装置 １６ 電子式膨張弁弁開度補正部 １７ 吸入配管 １８ 絞り装置 １９ 電子式膨張弁 ２０ 所定値決定部 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Expansion valve 4 Evaporator 5 Piping 8 1st temperature detection part 9 Temperature comparison part 10 Valve opening control part 11 Valve opening correction part 12 Motorized valve 13 Second temperature detector 14 3rd Temperature detector 15 Electronic expansion valve control device 16 Electronic expansion valve valve opening correction unit 17 Suction pipe 18 Throttle device 19 Electronic expansion valve 20 Predetermined value determination unit
Claims (2)
管で連結されてなる冷媒流路を持つ冷凍装置において、
この冷媒流路途中に設けられ前記蒸発器内の冷媒流量を
調節する電動弁、前記蒸発器近傍に配設され蒸発器の周
囲温度を検出して温度検出信号を発生する温度検出部、
前記温度検出信号と所定の設定温度に対応する基準値と
を比較し両者の差に応じた信号を発生する温度比較部、
前記温度比較部の信号によって前記電動弁の開度を制御
する弁開度制御部、および前記圧縮機停止後の再起動
時、前記電動弁の開度を［前記圧縮機停止時の値］＋
［所定値］とする弁開度補正部、前記［所定値］を［前
記圧縮機停止時の値］によって決定する所定値決定部を
備えたことを特徴とする冷凍装置。1. A refrigeration system having a refrigerant flow path in which a compressor, a condenser, a pressure reducing device, and an evaporator are connected by piping,
A motor-operated valve provided in the middle of the refrigerant flow path for adjusting the refrigerant flow rate in the evaporator, a temperature detection unit arranged in the vicinity of the evaporator to detect an ambient temperature of the evaporator and generate a temperature detection signal,
A temperature comparison unit that compares the temperature detection signal with a reference value corresponding to a predetermined set temperature and generates a signal according to the difference between the two.
A valve opening control unit that controls the opening degree of the electric valve according to a signal from the temperature comparison unit, and the opening degree of the electric valve when the compressor is restarted after being stopped [value when the compressor is stopped] +
A refrigeration apparatus comprising: a valve opening correction unit that sets a [predetermined value]; and a predetermined value determination unit that determines the [predetermined value] based on the [value when the compressor is stopped].
式膨張弁を前記電動弁と前記圧縮機との間の吸入配管の
温度と前記吸入配管内の圧力に相当する飽和温度との差
が所定の値になるように制御する電子式膨張弁制御装置
と、前記圧縮機起動時、前記電子式膨張弁の開度を前記
圧縮機停止時の開度に対し１を越える所定倍の開度で起
動し、所定時間後に前記圧縮機停止時の開度になるよう
に制御する電子式膨張弁弁開度補正部とを備えたことを
特徴とする請求項１記載の冷凍装置。2. A pressure reducing device is an electronic expansion valve, and the electronic expansion valve is a difference between a temperature of a suction pipe between the motor-operated valve and the compressor and a saturation temperature corresponding to a pressure in the suction pipe. Is controlled to a predetermined value, and an opening degree of the electronic expansion valve at the time of starting the compressor is a predetermined multiple that exceeds 1 with respect to the opening degree when the compressor is stopped. 2. The refrigerating apparatus according to claim 1, further comprising an electronic expansion valve valve opening correction unit that is started at a temperature of 10 degrees C. and is controlled to reach the opening when the compressor is stopped after a predetermined time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3303170A JP2646917B2 (en) | 1991-11-19 | 1991-11-19 | Refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3303170A JP2646917B2 (en) | 1991-11-19 | 1991-11-19 | Refrigeration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05141791A true JPH05141791A (en) | 1993-06-08 |
| JP2646917B2 JP2646917B2 (en) | 1997-08-27 |
Family
ID=17917734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3303170A Expired - Fee Related JP2646917B2 (en) | 1991-11-19 | 1991-11-19 | Refrigeration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2646917B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09243137A (en) * | 1996-03-07 | 1997-09-16 | Mitsubishi Electric Corp | Electronic expansion valve control device for air conditioner |
| KR20000037904A (en) * | 1998-12-03 | 2000-07-05 | 김영환 | Circuit for removing noise component of image signal |
-
1991
- 1991-11-19 JP JP3303170A patent/JP2646917B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09243137A (en) * | 1996-03-07 | 1997-09-16 | Mitsubishi Electric Corp | Electronic expansion valve control device for air conditioner |
| KR20000037904A (en) * | 1998-12-03 | 2000-07-05 | 김영환 | Circuit for removing noise component of image signal |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2646917B2 (en) | 1997-08-27 |
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