JPH0599516A - Freezer device - Google Patents
Freezer deviceInfo
- Publication number
- JPH0599516A JPH0599516A JP3264322A JP26432291A JPH0599516A JP H0599516 A JPH0599516 A JP H0599516A JP 3264322 A JP3264322 A JP 3264322A JP 26432291 A JP26432291 A JP 26432291A JP H0599516 A JPH0599516 A JP H0599516A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- valve
- compressor
- opening
- predetermined
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2515—Flow valves
Landscapes
- Devices That Are Associated With Refrigeration Equipment (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 a super showcase, a refrigerator, a constant temperature bath, etc., and more particularly to a refrigerating device which requires high accuracy in temperature control in 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7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, for example, Japanese Utility Model Publication No. 58-48987. As shown in FIG. 7, this refrigeration system comprises 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。また、圧縮機に吸入される圧力が低い状
態で長時間運転されると蒸発器に油がたまり、圧縮機に
油が戻らず、圧縮機が焼付きを起こすという問題があっ
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 as the temperature of the warm cylinder 7 changing, 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. Further, when the compressor is operated for a long time in a state where the pressure sucked into the compressor is low, oil accumulates in the evaporator, the oil does not return to the compressor, and the compressor is seized.
【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 the valve is restarted, a valve opening correction unit that sets the opening of the electrically operated valve to [value when the compressor is stopped] + [predetermined value] 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
式膨張弁の開度を所定の開度に対し1を越える所定倍の
開度で起動し、所定時間後に所定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 the difference between the saturation temperature and the saturation temperature to be a predetermined value, and when the compressor is started, the opening degree of the electronic expansion valve is a predetermined multiple that exceeds 1 with respect to the predetermined opening degree. An electronic expansion valve valve opening degree correction unit is provided which is activated at an opening degree and is controlled to reach a predetermined opening degree after a predetermined time.
【0007】また、前記圧縮機吸入圧力が所定値以下に
なる時間が、積算して所定時間をこえると、一定時間、
前記電動弁を全開とする油戻し制御部を設ける。Further, when the time when the compressor suction pressure is equal to or lower than a predetermined value is integrated and exceeds a predetermined time,
An oil return control unit that fully opens the motor-operated valve is provided.
【0008】[0008]
【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〕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, at the time of restarting after the compressor is stopped, the fixed value of the valve opening is output as [compressor stopped value] + [predetermined value],
The temperature is controlled by adjusting the opening degree of a motor-operated valve provided in the middle of the refrigerant flow path in accordance with this output.
【0009】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所定の開度に対し1を越
える所定倍の開度で起動し、所定時間後に所定開度にな
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。また、この発明におけ
る冷凍装置は、前記圧縮機吸入圧力が所定値以下になる
時間が、積算して所定時間をこえると、一定時間、前記
電動弁を全開とする油戻し制御部により、油戻しを行
う。Further, in the refrigerating apparatus according to the present invention, the decompression device is an electronic expansion valve, and the electronic expansion valve is adapted to adjust 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 a difference from a corresponding saturation temperature to a predetermined value, and at the time of starting the compressor, the opening degree of the electronic expansion valve is a predetermined multiple that exceeds 1 with respect to the predetermined opening degree. With the electronic expansion valve valve opening correction unit that starts at the opening of
Adjust the opening of the electronic expansion valve. Further, in the refrigerating apparatus according to the present invention, when the time when the compressor suction pressure becomes a predetermined value or less is integrated and exceeds a predetermined time, an oil return control unit that fully opens the motor-operated valve for a predetermined time causes an oil return I do.
【0010】[0010]
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〕
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。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 apparatus according to the present invention. In this refrigerant circuit, a compressor 1, a condenser 2, an expansion valve 3 and an evaporator 4 are connected by a pipe 5, and an outlet side of the evaporator 4 is provided. As in the conventional case, the temperature-sensitive cylinder 7 is provided, and the temperature-sensitive cylinder 7
Is connected to the expansion valve 3 to adjust the opening degree of the expansion valve 3,
Further, a blower 6 is arranged near the evaporator 4. A first temperature detector 8 is arranged near the evaporator 4 and detects the ambient temperature of the evaporator 4. 9 is a temperature comparison unit,
A comparator (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 is built in, and the temperature detection signal and the reference value are compared with each other. A comparison is made and a signal corresponding to the difference T is generated. Reference numeral 10 denotes a valve opening control unit, which responds to a signal from the temperature comparison unit 9
The valve opening W of the motor-operated valve 12 is controlled. Reference numeral 11 denotes a valve opening correction unit, which is used when the compressor 1 is restarted after being stopped.
Valve opening W of [value when the compressor 1 is stopped] + [predetermined value]
It is what The motor-operated valve 12 is provided in the pipe on the outlet side of the evaporator 4 and adjusts the flow rate of the refrigerant flowing in the evaporator 4.
【0011】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 the temperature change. By controlling the flow rate, it is possible to respond quickly to changes in the temperature inside the refrigerator.
【0012】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10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S21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10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.
The fixed value output from the valve opening control unit 10 for adjusting the opening of the electric valve 12 is based on the signal from the temperature comparison unit 9. That is, when the compressor 1 is not restarted in step S21 in FIG. 2, the process proceeds to step S23. In step S23, if a signal indicating that the internal cold storage temperature is higher than a predetermined temperature is input from the temperature comparison unit 9, the process proceeds to step S24, and the valve opening control unit 10 causes the motor-operated valve 12 to operate.
The motor-operated valve 12 so as to increase the valve opening W of the
Is output to. On the contrary, in step S23, when a signal 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 motor-operated valve is operated.
The motorized valve is designed to reduce the valve opening W of 12 by a fixed amount ΔW.
Output to 12.
【0013】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〕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 motor-operated valve 12 is [compressor]. 1 value when stopped] + [predetermined value].
【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3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17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、16は、上記圧縮機1起動時、上記電
子式膨張弁19の開度を所定の開度に対し1を越える所定
倍の開度で起動し、所定時間後に所定開度になるように
制御する電子式膨張弁弁開度補正部である。Example 2. FIG. 3 is a diagram showing a circuit configuration of a refrigerating apparatus 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 is a suction pipe that communicates between the motor-operated valve 12 and the compressor 1, 13 is a second temperature detector that detects the temperature of the suction pipe 17, and 18 is a suction pipe from the inlet liquid pipe of the electronic expansion valve 19. A throttling device communicating with the pipe 17 and a third temperature detector 14 for detecting the temperature immediately after exiting the throttling device 18 (saturation temperature corresponding to the pressure of the suction pipe 17). 15 is
Electronic expansion for controlling 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 a valve control device. Further, the reference numeral 16 indicates that when the compressor 1 is started, the opening degree of the electronic expansion valve 19 is started by a predetermined multiple of more than 1 with respect to a predetermined opening degree, and becomes a predetermined opening degree after a predetermined time. It is an electronic expansion valve valve opening degree correction unit that controls.
【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 refrigeration system, the opening of the motor-operated 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4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4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. 4 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, when the compressor 1 is not restarted in step S41 in FIG. 4, 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 and the temperature detected by the third temperature detector 14 is higher than a predetermined value is input, In step S44, the electronic expansion valve control device 15 controls the valve opening degree G of the electronic expansion valve 19 by a predetermined amount ΔG.
It is output to the electronic expansion valve 19 so as to increase. On the contrary, in step S43, 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. If so, the process proceeds to step S45, and 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4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の弁開度は所定の開度に対し1を越える所定倍の開
度で起動し、所定時間後に所定開度になるように運転さ
れる。Further, in FIG. 4, when the compressor 1 is restarted in step S41, the process proceeds to step S42, in which the electronic expansion valve valve opening correction section 16 acts to cause the valve of the electronic expansion valve 19 to operate. The opening is started at a predetermined multiple of more than 1 with respect to the predetermined opening, and is operated so as to reach the predetermined opening after a predetermined time.
【0019】なお、本発明は、電子式膨張弁8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 throttling device 18 communicating from the inlet liquid pipe of the electronic expansion valve 8 to the suction pipe 17, and the temperature immediately after the throttling device 18 is discharged (corresponding to the pressure of the suction pipe 17). (Saturation temperature) is detected by the third temperature detector 14,
A pressure sensor is provided in the suction pipe 17 to detect pressure,
The pressure value may be converted into temperature.
【0020】実施例3.図5はこの発明の実施例3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の構成要素に加えて、圧縮機吸
入圧力を検出する圧力センサ21が追加されている。ま
た、20は、油戻し制御部であって、前記圧力センサ21の
出力が所定値以下になる時間が積算して所定時間をこえ
ると、前記電動弁12を一定時間、全開とするものであ
る。Example 3. FIG. 5 is a diagram showing a circuit configuration of a refrigerating apparatus according to Embodiment 3 of the present invention. As shown in the figure, in addition to the constituent elements of the first embodiment in FIG. 1, a pressure sensor 21 for detecting the compressor suction pressure is added. Further, 20 is an oil return control unit, and when the time when the output of the pressure sensor 21 becomes a predetermined value or less is integrated and exceeds a predetermined time, the electric valve 12 is fully opened for a certain time. ..
【0021】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 refrigeration system, the opening of the motor-operated 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 changes in temperature.
【0022】図6に冷凍装置の弁開度制御部10、油戻し
制御部20の制御動作手順を示す。前記電動弁12の開度調
節のための弁開度制御部10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6においてステップS61で圧縮機吸入圧力が所定値以
下になる積算時間が所定値以下の場合、ステップS63に
進む。ステップS63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S64に進み、前記弁開度制御部10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S63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S65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. 6 shows a control operation procedure of the valve opening control unit 10 and the oil return control unit 20 of the refrigeration system. The fixed value output from the valve opening control unit 10 for adjusting the opening of the electric valve 12 is based on the signal from the temperature comparison unit 9. That is,
In FIG. 6, in step S61, if the integrated time for which the compressor suction pressure is less than or equal to the predetermined value is less than or equal to the predetermined value, the process proceeds to step S63. In step S63, the temperature comparison unit 9
If a signal indicating that the internal temperature is higher than the predetermined temperature is input, the process proceeds to step S64, where the valve opening control unit 10 causes
It is output to the motor-operated valve 12 so as to increase the valve opening degree W of the motor-operated valve 12 by a fixed amount ΔW. On the contrary, when a signal that the internal cold storage temperature is lower than the predetermined temperature is input from the temperature comparison unit 9 in step S63, the process proceeds to step S65.
It is output to the motor-operated valve 12 so as to reduce the valve opening degree W of the motor-operated valve 12 by a predetermined amount ΔW.
【0023】また、図6において、ステップS61で圧縮
機吸入圧力が所定値以下になる積算時間が所定値をこえ
た場合、ステップS62に進み、油戻し制御部20の作用に
より、前記電動弁12の弁開度は一定時間全開で運転され
る。Further, in FIG. 6, when the integrated time for which the compressor suction pressure is less than or equal to the predetermined value exceeds the predetermined value in step S61, the process proceeds to step S62 and the operation of the oil return control unit 20 causes the motor-operated valve 12 to operate. The valve opening is operated at full opening for a certain period of time.
【0024】[0024]
【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〕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 output, 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 output as [compressor stopped value] + [predetermined value]. As a result, the opening degree of the motor-operated valve provided in the middle of the refrigerant flow path is adjusted. 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.
【0025】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、所定の開度
に対し1を越える所定倍の開度で起動し、所定時間後に
所定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 and the electronic expansion valve control device for controlling the valve to be a predetermined value, the opening degree of the electronic expansion valve is started at a predetermined multiple of more than 1 with respect to the predetermined opening, The opening degree of the electronic expansion valve is adjusted by the electronic expansion valve valve opening degree correction unit that controls the opening degree to reach the predetermined opening degree after the elapse of time. Therefore, even when the compressor is restarted after it is stopped, the suction pressure of the compressor drops sharply and the compressor stops, or conversely a large amount of liquid returns to the compressor and the overcurrent protector etc. operates. Then
The compressor never stops.
【0026】また、この発明は以上のように構成されて
いるので、圧縮機吸入圧力が所定値以下になる時間が、
積算して所定時間をこえると、一定時間、電動弁を全開
とする油戻し制御部により、油戻しを行い、蒸発器に油
がたまり、圧縮機に油が戻らず、圧縮機が焼付きを起こ
すという問題が発生しない。Further, since the present invention is constituted as described above, the time during which the compressor suction pressure becomes equal to or lower than the predetermined value is
When the accumulated value exceeds the predetermined time, the oil return control unit, which fully opens the motor-operated valve for a certain period of time, returns the oil, and the oil accumulates in the evaporator, the oil does not return to the compressor, and the compressor does not seize. The problem of causing it does not occur.
【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】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. 3 is a refrigerant circuit diagram of a refrigeration system showing Embodiment 2 of the present invention.
【図4】図3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。4 is an electronic expansion valve control device for the refrigeration system shown in FIG. 3,
It is a flow chart which shows a control operation procedure of an electronic expansion valve valve opening amendment part.
【図5】この発明の実施例3を示す冷凍装置の冷媒回路
図である。FIG. 5 is a refrigerant circuit diagram of a refrigeration system showing Embodiment 3 of the present invention.
【図6】図5に示す冷凍装置の弁開度制御部、油戻し制
御部の制御動作手順を示すフローチャートである。6 is a flowchart showing a control operation procedure of a valve opening control unit and an oil return control unit of the refrigeration system shown in FIG.
【図7】従来例を示す冷凍装置の冷媒回路図である。FIG. 7 is a refrigerant circuit diagram of a refrigeration apparatus showing a conventional example.
1 圧縮機 2 凝縮器 3 減圧装置 4 蒸発器 5 配管 8 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 油戻し制御部 21 圧力センサ 1 Compressor 2 Condenser 3 Decompressor 4 Evaporator 5 Piping 8 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 Third temperature detection 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 Oil return control unit 21 Pressure sensor
Claims (3)
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 the stoppage of [the value when the compressor is stopped] +
A refrigeration apparatus comprising a valve opening correction unit that sets a [predetermined value].
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所定
の開度に対し1を越える所定倍の開度で起動し、所定時
間後に所定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 when the compressor is started, the opening degree of the electronic expansion valve is started at a predetermined multiple of more than 1 with respect to the predetermined opening. The refrigeration apparatus according to claim 1, further comprising an electronic expansion valve valve opening degree correction unit that controls the opening degree to a predetermined opening degree after a predetermined time.
時間が、積算して所定時間をこえると、一定時間、前記
電動弁を全開とする油戻し制御部を備えたことを特徴と
する請求項1記載の冷凍装置。3. An oil return control unit for fully opening the motor-operated valve for a fixed time when the time when the suction pressure of the compressor is equal to or lower than a predetermined value is integrated and exceeds a predetermined time. The refrigeration system according to claim 1.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3264322A JP2785546B2 (en) | 1991-10-14 | 1991-10-14 | Refrigeration equipment |
KR1019920006581A KR960004918B1 (en) | 1991-10-14 | 1992-04-20 | Freezing room temperature control system of refrigerator |
TW081103169A TW209897B (en) | 1991-10-14 | 1992-04-22 | Freezing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3264322A JP2785546B2 (en) | 1991-10-14 | 1991-10-14 | Refrigeration equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0599516A true JPH0599516A (en) | 1993-04-20 |
JP2785546B2 JP2785546B2 (en) | 1998-08-13 |
Family
ID=17401575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3264322A Expired - Fee Related JP2785546B2 (en) | 1991-10-14 | 1991-10-14 | Refrigeration equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2785546B2 (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 |
CN113899124A (en) * | 2021-10-12 | 2022-01-07 | 珠海格力电器股份有限公司 | Pressure regulation control method and device, electronic equipment and refrigeration equipment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63161359A (en) * | 1986-12-23 | 1988-07-05 | 株式会社日立製作所 | Refrigerator |
JPH01208666A (en) * | 1988-02-15 | 1989-08-22 | Sanyo Electric Co Ltd | Refrigerating plant |
JPH02217753A (en) * | 1989-02-17 | 1990-08-30 | Sanyo Electric Co Ltd | Control of refrigerant flow rate controller |
-
1991
- 1991-10-14 JP JP3264322A patent/JP2785546B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63161359A (en) * | 1986-12-23 | 1988-07-05 | 株式会社日立製作所 | Refrigerator |
JPH01208666A (en) * | 1988-02-15 | 1989-08-22 | Sanyo Electric Co Ltd | Refrigerating plant |
JPH02217753A (en) * | 1989-02-17 | 1990-08-30 | Sanyo Electric Co Ltd | Control of refrigerant flow rate controller |
Cited By (3)
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 |
CN113899124A (en) * | 2021-10-12 | 2022-01-07 | 珠海格力电器股份有限公司 | Pressure regulation control method and device, electronic equipment and refrigeration equipment |
CN113899124B (en) * | 2021-10-12 | 2022-06-14 | 珠海格力电器股份有限公司 | Pressure regulation control method and device, electronic equipment and refrigeration equipment |
Also Published As
Publication number | Publication date |
---|---|
JP2785546B2 (en) | 1998-08-13 |
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