JPH0248777Y2 - - Google Patents
Info
- Publication number
- JPH0248777Y2 JPH0248777Y2 JP19540785U JP19540785U JPH0248777Y2 JP H0248777 Y2 JPH0248777 Y2 JP H0248777Y2 JP 19540785 U JP19540785 U JP 19540785U JP 19540785 U JP19540785 U JP 19540785U JP H0248777 Y2 JPH0248777 Y2 JP H0248777Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- expansion valve
- evaporator
- hot gas
- refrigeration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005057 refrigeration Methods 0.000 claims description 38
- 239000003507 refrigerant Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 description 15
- 238000007664 blowing Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 244000298697 Actinidia deliciosa Species 0.000 description 1
- 235000009436 Actinidia deliciosa Nutrition 0.000 description 1
- 241000273649 Citrus hassaku Species 0.000 description 1
- 240000008790 Musa x paradisiaca Species 0.000 description 1
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Air-Conditioning For Vehicles (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
この考案は、たとえばコンテナ等に用いれば好
適な冷凍装置に関する。[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a refrigeration system suitable for use in containers, for example.
〈従来の技術〉
一般にコンテナに用いられる冷凍装置は、コン
テナの庫内温度−10℃以下の冷凍領域に制御する
冷凍運転と、−10℃より高い温度のチルド領域に
制御する冷蔵運転とが行なえるようになつてい
る。このような冷凍装置として、最近次のような
ものが提案されている。（特開昭59−122863号公
報）。この冷凍装置は、圧縮機、凝縮器、膨張弁
および蒸発器を順次連結して冷媒を循環させる冷
凍回路を形成する一方、上記圧縮機と凝縮器との
間の管路と上記蒸発器と膨張弁との間の管路とを
連結すると共に、中間にホツトガス弁を有するバ
イパス路を設け、さらに上記バイパス路から制御
通路を介して導かれるホツトガス圧力を上記膨張
弁に作用させるかまたは上記蒸発器出口圧力を上
記膨張弁に作用させるように切換接続する三方弁
を設けている。そして、冷蔵運転時、バイパス路
に設けたホツトガス弁の弁開度を大きくしてバイ
パス路に導かれるホツトガスの流量を増加させ、
このホツトガスをバイパス路から蒸発器入口に直
接導く一方、バイパス路のホツトガス圧力を制御
通路を介して膨張弁に導いて、上記ホツトガス圧
力に対応した弁開度に膨張弁を絞り、膨張弁を通
過する冷媒液の流入量を減少して冷凍能力を低下
させるようにし、上記ホツトガスと膨張弁を通過
した後の冷媒とを合流させて蒸発器に導入して、
蒸発器からの吹出空気温度を設定値に一致するよ
うに制御している。<Prior art> Refrigeration equipment generally used for containers can perform refrigeration operation that controls the internal temperature of the container in the freezing range of -10°C or lower, and refrigeration operation that controls the temperature in the chilled range that is higher than -10°C. It is becoming more and more common. Recently, the following types of refrigeration devices have been proposed. (Japanese Unexamined Patent Publication No. 122863/1983). In this refrigeration system, a compressor, a condenser, an expansion valve, and an evaporator are sequentially connected to form a refrigeration circuit that circulates refrigerant. A bypass passage having a hot gas valve is provided in the middle, and the hot gas pressure guided from the bypass passage is applied to the expansion valve or the evaporator. A three-way valve is provided to switch and connect the outlet pressure to the expansion valve. During refrigeration operation, the opening degree of the hot gas valve provided in the bypass path is increased to increase the flow rate of hot gas guided to the bypass path,
This hot gas is guided directly from the bypass path to the evaporator inlet, while the hot gas pressure in the bypass path is guided to the expansion valve via the control path, the expansion valve is throttled to the valve opening corresponding to the hot gas pressure, and the hot gas passes through the expansion valve. The refrigerating capacity is reduced by reducing the inflow amount of the refrigerant liquid, and the hot gas and the refrigerant after passing through the expansion valve are combined and introduced into the evaporator.
The temperature of the air blown from the evaporator is controlled to match the set value.
〈考案が解決しようとする問題点〉
しかしながら、上記従来の冷凍装置では、冷蔵
運転を行なう場合、ホツトガス圧力を常に膨張弁
に作用させているため、吹出空気温度の設定値を
高くすると、バイパス路に設けたホツトガス弁の
開度が大きくなつて、バイパス路に導かれるホツ
トガスの流量が増加するようになる。その結果、
ホツトガス圧力が増加して膨張弁の弁開度を必要
以上に絞ることになつて、膨張弁を通過する冷媒
液の流量は上記設定値に対応する流量に比べて少
なくなる。このため、蒸発器用のフアンモータの
発熱量、庫内の積載貨物による呼吸熱量や換気量
（例えばキウイは庫内設定温度0.5℃の下で10m3／
ｈ、オレンジは５℃の下で50m3／ｈ、バナナは13
℃の下で140m3／ｈ）によつては、吹出空気温度
の設定値が高い場合であつても、冷凍負荷が大き
い場合に、膨張弁から蒸発器に適切な冷媒流量を
導入させることができず、吹出空気温度が設定値
より高くなるという問題がある。<Problems to be solved by the invention> However, in the above-mentioned conventional refrigeration equipment, when performing refrigeration operation, hot gas pressure is constantly applied to the expansion valve. The opening degree of the hot gas valve provided in the bypass passage increases, and the flow rate of the hot gas guided to the bypass passage increases. the result,
Since the hot gas pressure increases and the opening degree of the expansion valve is reduced more than necessary, the flow rate of the refrigerant liquid passing through the expansion valve becomes smaller than the flow rate corresponding to the set value. For this reason, the amount of heat generated by the fan motor for the evaporator, the amount of respiratory heat due to the cargo loaded in the warehouse, and the amount of ventilation (for example, kiwi fruit is 10 m 3 /
h. Orange is 50m 3 /h at 5℃, banana is 13
℃ (140 m 3 /h), it is not possible to introduce an appropriate flow rate of refrigerant from the expansion valve to the evaporator when the refrigeration load is large, even if the blowout air temperature setting is high. There is a problem that the temperature of the blown air becomes higher than the set value.
そこで、この考案の目的は、冷蔵運転における
吹出空気温度を高く設定しても、膨張弁の弁開度
を適切に制御できて、吹出空気温度を設定値に一
致できるように制御し得ることにある。 Therefore, the purpose of this invention is to be able to appropriately control the opening degree of the expansion valve even if the temperature of the blowing air during refrigeration operation is set high, so that the temperature of the blowing air can be controlled to match the set value. be.
〈問題点を解決するための手段〉
上記目的を達成するため、この考案の冷凍装置
は、第１図に例示するように、バイパス路１１か
ら制御通路１５を介してホツトガス圧力を膨張弁
６に作用させるかまたは蒸発器８出口圧力を膨張
弁６に作用させるように切換接続する。弁１６を
設ける一方、冷蔵運転時における設定温度に応じ
て、上記弁１６を切換える制御信号を出力する制
御手段２１を設けたことを特徴としている。より
詳しくは、この冷凍装置は、圧縮機１、凝縮器
２，４、膨張弁６および蒸発器８を順次連結して
冷媒を循環させる冷凍回路を形成すると共に、上
記圧縮機１と上記凝縮器２，４との間の管路９と
上記蒸発器８と膨張弁６との間の管路１０とを連
結するホツトガス弁１２付きのバイパス路１１を
設け、さらに上記ホツトガス弁１２を出口側のバ
イパス路１１から制御通路１５を介して導かれる
ホツトガス圧力を上記膨張弁６に作用させるかま
たは上記蒸発器８出口圧力を上記膨張弁６に作用
させるように切換接続する弁１６を設けて、冷蔵
運転時に上記バイパス路１１のホツトガス圧力を
上記膨張弁６に作用させて、均圧制御をし得るよ
うにした冷凍装置において、上記冷蔵運転時にお
いて上記蒸発器８を流通する空気の温度の設定値
が入力され、上記設定値が所定値以下のとき上記
ホツトガス圧力を上記膨張弁６に作用させ、上記
設定値が所定値より高いとき上記蒸発器８の出口
圧力を上記膨張弁６に作用させるように上記弁１
６を切換える制御信号を出力する制御手段２１を
設けている。<Means for Solving the Problems> In order to achieve the above object, the refrigeration system of this invention applies hot gas pressure to the expansion valve 6 from the bypass passage 11 through the control passage 15, as illustrated in FIG. Alternatively, the evaporator 8 outlet pressure can be switched and connected to be applied to the expansion valve 6. It is characterized in that a valve 16 is provided, and a control means 21 is provided that outputs a control signal to switch the valve 16 according to the set temperature during refrigeration operation. More specifically, in this refrigeration system, a compressor 1, condensers 2 and 4, an expansion valve 6, and an evaporator 8 are sequentially connected to form a refrigeration circuit that circulates refrigerant, and the compressor 1 and the condenser A bypass passage 11 with a hot gas valve 12 is provided to connect the pipeline 9 between the evaporator 8 and the expansion valve 6 to the pipeline 10 between the evaporator 8 and the expansion valve 6. A valve 16 is provided to switch and connect the hot gas pressure led from the bypass passage 11 through the control passage 15 to the expansion valve 6 or the outlet pressure of the evaporator 8 to the expansion valve 6. In a refrigeration system capable of pressure equalization control by applying hot gas pressure in the bypass passage 11 to the expansion valve 6 during operation, a set value for the temperature of air flowing through the evaporator 8 during the refrigeration operation is provided. is input, and when the set value is below a predetermined value, the hot gas pressure is applied to the expansion valve 6, and when the set value is higher than the predetermined value, the outlet pressure of the evaporator 8 is applied to the expansion valve 6. above valve 1
A control means 21 is provided for outputting a control signal for switching 6.
〈作用〉
上記構成により、冷蔵運転時に吹出空気温度が
所定値より高く設定されると、制御手段２１から
弁１６に制御信号が出力される。弁１６はホツト
ガス圧力の膨張弁６への作用を遮断する一方、蒸
発器８の出口圧力を膨張弁６に作用するように切
換えられる。従つて、蒸発器８出口の冷媒過熱度
を所定値４（例えば５℃）に制御するように膨張
弁６は開かれて、膨張弁６を通過する冷媒液の流
量は、膨張弁６にホツトガス圧力を作用させる場
合に比して増加する。上記膨張弁６からの冷媒は
蒸発器８入口でホツトガスと合流して蒸発器８に
導入される。こうして、蒸発器８からの吹出空気
温度は設定値に制御される。したがつて、設定値
が所定値よりも高く設定された冷凍負荷の大きい
場合でも十分冷却ができる。一方、設定値が所定
値よりも低い場合には、ホツトガス圧力が膨張弁
に作用させられ、ホツトガスの量に応じて膨張弁
の開度が絞られ、エネルギの節約が図られる。<Operation> With the above configuration, when the temperature of the blown air is set higher than a predetermined value during refrigeration operation, a control signal is output from the control means 21 to the valve 16. The valve 16 is switched to block the hot gas pressure from acting on the expansion valve 6 while allowing the outlet pressure of the evaporator 8 to act on the expansion valve 6. Therefore, the expansion valve 6 is opened so as to control the degree of superheating of the refrigerant at the outlet of the evaporator 8 to a predetermined value of 4 (for example, 5° C.), and the flow rate of the refrigerant liquid passing through the expansion valve 6 is such that the hot gas This increases compared to when pressure is applied. The refrigerant from the expansion valve 6 joins with the hot gas at the inlet of the evaporator 8 and is introduced into the evaporator 8. In this way, the temperature of the air blown from the evaporator 8 is controlled to the set value. Therefore, even when the refrigerating load is large and the set value is set higher than the predetermined value, sufficient cooling can be achieved. On the other hand, when the set value is lower than the predetermined value, the hot gas pressure is applied to the expansion valve, and the opening degree of the expansion valve is reduced according to the amount of hot gas, thereby saving energy.
〈実施例〉
以下、この考案を図示の実施例により詳細に説
明する。<Example> This invention will be explained in detail below with reference to the illustrated example.
第１図はこの考案の実施例を示す冷媒配管系統
図であり、１は圧縮機、２，４は上記圧縮機１か
ら吹出された冷媒ガスを冷却して冷媒液にする空
冷凝縮器および水冷凝縮器、５は受液器、６は上
記冷媒液を絞り膨張させて低圧、低温の気液混合
状態で吐出する膨張弁としての温度自動膨張弁、
６ａは該温度自動膨張弁６の感温筒、８は上記気
液混合状態の冷媒より熱をうばつて気化させる蒸
発器、４０は高低圧スイツチHLPS、油圧保護ス
ツチOPS、水圧スイツチWPS、高圧制御スイツ
チHPSをもつた安全器である。 FIG. 1 is a refrigerant piping system diagram showing an embodiment of this invention, in which 1 is a compressor, 2 and 4 are air-cooled condensers and water-cooled condensers that cool the refrigerant gas blown out from the compressor 1 and turn it into a refrigerant liquid. a condenser; 5 a liquid receiver; 6 a thermostatic expansion valve that throttles and expands the refrigerant liquid and discharges it in a low-pressure, low-temperature gas-liquid mixed state;
6a is a temperature-sensitive cylinder of the automatic temperature expansion valve 6; 8 is an evaporator that vaporizes heat from the refrigerant in the gas-liquid mixed state; 40 is a high/low pressure switch HLPS, a hydraulic protection switch OPS, a water pressure switch WPS, and a high pressure control It is a safety device with switch HPS.
上記圧縮機１に空冷凝縮器２、水冷凝縮器４、
受液器５、温度自動膨張弁６、蒸発器８を順次連
結して冷凍回路を形成している。上記圧縮機１と
空冷凝縮器２との間の管路９と上記温度自動膨張
弁６と蒸発器との間の管路１０とをバイパス路１
１で連結し、このバイパス路１１にはホツトガス
弁１２を設けている。上記ホツトガス弁１２は、
オン，オフ機能をもつ電磁弁を用いてもよいが、
主として電圧に比例して弁開度を０％100％に制
御可能とした電磁比例制御弁を用い、コントロー
ラ１４により制御される。上記コントロール１４
には、蒸発器８の吸入側に配置され、庫内からの
戻り空気即ち吸入空気温度を検知するリターンセ
ンサRSからの温度信号と、蒸発器８の吹出側に
配置され、吹出空気温度を検知するサプライセン
サSSからの温度信号とが入力される。上記コン
トローラ１４は、冷凍運転の場合には、吸込側の
リターンセンサRSをもとに圧縮機１の発停制御
を行なう一方、冷蔵運転の場合には、吹出側のサ
プライセンサSSをもとにホツトガス弁１２を０
〜100％の開度で制御し、この開度に応じたホツ
トガス流量をバイパスさせている。 The compressor 1 includes an air-cooled condenser 2, a water-cooled condenser 4,
A liquid receiver 5, a thermostatic expansion valve 6, and an evaporator 8 are connected in sequence to form a refrigeration circuit. A bypass line 1 includes a pipe line 9 between the compressor 1 and the air-cooled condenser 2 and a pipe line 10 between the thermostatic expansion valve 6 and the evaporator.
1, and this bypass passage 11 is provided with a hot gas valve 12. The hot gas valve 12 is
A solenoid valve with an on/off function may be used, but
It is mainly controlled by a controller 14 using an electromagnetic proportional control valve that can control the valve opening degree from 0% to 100% in proportion to the voltage. Control 14 above
The sensor receives a temperature signal from a return sensor RS, which is placed on the suction side of the evaporator 8 and detects the temperature of the return air from inside the refrigerator, that is, the intake air, and a temperature signal from the return sensor RS, which is placed on the blowout side of the evaporator 8 and detects the temperature of the blowing air. A temperature signal from the supply sensor SS is input. In the case of refrigeration operation, the controller 14 controls the start and stop of the compressor 1 based on the return sensor RS on the suction side, while in the case of refrigeration operation, it controls the start and stop of the compressor 1 based on the supply sensor SS on the blowout side. Set the hot gas valve 12 to 0.
The opening is controlled at ~100%, and the hot gas flow rate is bypassed according to this opening.
上記バイパス路１１から制御通路１５を介して
導かれるホツトガス圧力を上記温度自動膨張弁６
に作用させるかまたは上記蒸発器８の出口圧力を
上記温度自動膨張弁６に作用させるように切換接
続する弁の一例としての電磁三方弁１６を設けて
いる。この電磁三方弁１６は、２つの切換ポート
の１つに、上記制御通路１５を、他の１つに第１
均圧管１９をそれぞれ接続すると共に、固定ポー
トに第２均圧管２０を接続し、上記温度自動膨張
弁６に連通する第２均圧管２０を、上記制御通路
１５と第１均圧管１９とに切換えるようになつて
いる。上記電磁三方弁１６を切換える制御信号を
出力する制御出段としての制御器２１を設けてい
る。 The hot gas pressure led from the bypass passage 11 through the control passage 15 is applied to the thermostatic expansion valve 6.
An electromagnetic three-way valve 16 is provided as an example of a valve that can be switched and connected so as to apply the outlet pressure of the evaporator 8 to the thermostatic expansion valve 6. This electromagnetic three-way valve 16 connects the control passage 15 to one of the two switching ports and connects the control passage 15 to the other one.
The pressure equalization pipes 19 are respectively connected, and the second pressure equalization pipe 20 is connected to the fixed port, and the second pressure equalization pipe 20 communicating with the thermostatic expansion valve 6 is switched to the control passage 15 and the first pressure equalization pipe 19. It's becoming like that. A controller 21 is provided as a control stage that outputs a control signal for switching the electromagnetic three-way valve 16.
この制御器２１には、コンテナの庫内に収納し
た冷凍食品の種類に応じて異なる吹出空気温度の
設定値が入力される。上記制御器２１は、この設
定温度が10℃以上または−10℃未満に設定されて
いる場合、制御通路１５からのホツトガス圧力を
遮断して、第１均圧管１９と第２均圧管２０とを
接続するように電磁三方弁１６を切換える制御信
号を出力する一方、設定値が−10℃以上10℃未満
に設定されている場合、制御通路１５と第２均圧
管２０とを接続してホツトガス圧力を温度自動膨
張弁６に作用するように電磁三方弁１６を切換え
る制御信号を出力するようになつている。さらに
上記制御器２１は入力された設定値をコントロー
ラ１４に出力して、コントローラ１４は上記設定
値の値に応じてリターンセンサRSあるいはサプ
ライセンサSSのいずれかを選択するようになつ
ている。 The controller 21 is inputted with different set values for the temperature of the blowing air depending on the type of frozen food stored in the container. When the set temperature is set to 10°C or more or less than -10°C, the controller 21 shuts off the hot gas pressure from the control passage 15 and closes the first pressure equalizing pipe 19 and the second pressure equalizing pipe 20. While outputting a control signal to switch the electromagnetic three-way valve 16 to connect the control passage 15 and the second pressure equalizing pipe 20, if the set value is set to -10°C or more and less than 10°C, the control passage 15 and the second pressure equalizing pipe 20 are connected to A control signal is output for switching the electromagnetic three-way valve 16 so as to act on the thermostatic expansion valve 6. Further, the controller 21 outputs the input set value to the controller 14, and the controller 14 selects either the return sensor RS or the supply sensor SS depending on the value of the set value.
また、上記蒸発器８には、２台のフアン３１，
３１が付設されている一方、空冷凝縮器２には、
３台のフアン３２，３２，３２が付設されてい
る。上記受液器５と温度自動膨張弁６との間の管
路３４には、受液器５側からドライヤ３５、リキ
ツドインジケータ３６、電磁弁３７が順次設けら
れている。 The evaporator 8 also includes two fans 31,
31, while the air-cooled condenser 2 has
Three fans 32, 32, 32 are attached. In the conduit 34 between the liquid receiver 5 and the thermostatic expansion valve 6, a dryer 35, a liquid indicator 36, and a solenoid valve 37 are sequentially provided from the liquid receiver 5 side.
上記構成において冷凍装置の作動を第２図に示
すフローチヤートに基づいて説明する。 The operation of the refrigeration system in the above configuration will be explained based on the flowchart shown in FIG.
まず、吹出空気温度の設定値をたとえば５℃と
し、この設定温度SET，Ｔを制御器２１に入力
するとする。制御器２１はコントローラ１４に設
定値を入力して、コントローラ１４はサプライセ
ンサSSを選択する。一方、上記制御器２１は電
磁三方弁１６に制御信号を出力して、電磁三方弁
１６は切換えられてオンとなり、制御通路１５と
第２均圧管２０とが連通し、第１均圧管１９は遮
断される。上記コントローラ１４内でサプライセ
ンサSSで検出する吹出空気温度と設定値との比
較演算が行なわれ、この演算結果に応じた弁開度
になるようにホツトガス弁１２にコントローラ１
４より開閉信号が出力される。こうして、ホツト
ガス弁１２の開度制御が行なわれる。そして、冷
蔵運転が開始されて、上記バイパス路１１を流れ
るホツトガスの流量は、上記弁開度に対応した流
量で、制御通路１５を介して温度自動膨張弁６の
第２均圧管２０に流れて、温度自動膨張弁６をホ
ツトガスの圧力に対応した弁開度に絞る。従つ
て、この場合は、温度自動膨張弁６は蒸発器８出
口の冷媒を所定の過熱度に制御してはいけない。 First, it is assumed that the set value of the blowing air temperature is, for example, 5° C., and that this set temperature SET,T is input to the controller 21. The controller 21 inputs a setting value to the controller 14, and the controller 14 selects the supply sensor SS. On the other hand, the controller 21 outputs a control signal to the electromagnetic three-way valve 16, so that the electromagnetic three-way valve 16 is switched on and the control passage 15 and the second pressure equalizing pipe 20 communicate with each other, and the first pressure equalizing pipe 19 will be cut off. In the controller 14, a comparison calculation is performed between the blowing air temperature detected by the supply sensor SS and a set value, and the controller 1
An opening/closing signal is output from 4. In this way, the opening degree of the hot gas valve 12 is controlled. Then, when the refrigeration operation is started, the flow rate of the hot gas flowing through the bypass passage 11 corresponds to the opening degree of the valve, and the hot gas flows through the control passage 15 to the second pressure equalization pipe 20 of the thermostatic expansion valve 6. , the temperature automatic expansion valve 6 is throttled to a valve opening corresponding to the pressure of the hot gas. Therefore, in this case, the thermostatic expansion valve 6 must not control the refrigerant at the outlet of the evaporator 8 to a predetermined degree of superheat.
従つて、上記温度自動膨張弁６を通る液冷媒量
は、その弁開度に応じて減少する一方、所望流量
のホツトガス温度自動膨張弁６からの流媒と合流
して蒸発器８に導かれ、上記温度自動膨張弁６の
弁開度の減少により冷凍能力及び圧縮機の入力を
減少した状態で、吹出空気温度の制御が高精度に
行なえるのである。 Therefore, the amount of liquid refrigerant passing through the thermostatic expansion valve 6 decreases in accordance with the opening degree of the valve, while the liquid refrigerant merges with the desired flow rate of hot gas fluid from the thermostatic expansion valve 6 and is guided to the evaporator 8. By reducing the opening degree of the thermostatic expansion valve 6, the temperature of the blown air can be controlled with high precision while the refrigerating capacity and input to the compressor are reduced.
次に、吹出空気温度の設定値を13℃とし、この
設定温度SET，Ｔを制御器２１に入力するとす
る。制御器２１にはコントローラ１４に設定値を
入力して、コントローラ１４で引き続きサプライ
センサSSが選択される。上記制御器２１は電磁
三方弁１６に制御信号を出力して、電磁三方弁１
６はオフとなり、第１均圧管１９と第２均圧管２
０とが連通し、制御通路１５が遮断される。上記
コントローラ１４は、吹出空気温度と設定値との
比較演算を行なつて、ホツトガス弁１２の弁開度
を制御する信号を出力する。そして、冷蔵運転が
開始されて、バイパス路１１に導かれるホツトガ
スの流量はホツトガス弁１２の弁開度に対応する
流量であつて、このホツトガスが蒸発器８に導入
される。同時に、蒸発器８の出口冷媒の過熱度が
所定値となるように温度自動膨張弁６の弁開度が
制御される。従つて、温度自動膨張弁６を通過す
る冷媒液の流量は前記膨張弁６にホツトガス圧力
を作用させる場合に比して増加して温度自動膨張
弁６からの冷媒はバイパス路１１からのホツトガ
スと蒸発器８の入口で合流し、蒸発器８に導入さ
れる。従つて、設定値が高く、かつ冷凍負荷が大
きい場合でも蒸発器８での吹出空気温度を設定値
に一致するように制御させることができるのであ
る。このように、設定値が高くなつても温度自動
膨張弁６の弁開度を適切に制御できて吹出空気温
度を調整できるので、冷蔵運転における冷凍能力
を拡大させることができる。 Next, assume that the set value of the blowing air temperature is 13° C., and this set temperature SET,T is input to the controller 21. A set value is input to the controller 14 in the controller 21, and the controller 14 subsequently selects the supply sensor SS. The controller 21 outputs a control signal to the electromagnetic three-way valve 16 and
6 is turned off, and the first pressure equalizing pipe 19 and the second pressure equalizing pipe 2
0 is in communication, and the control passage 15 is blocked. The controller 14 performs a comparison calculation between the blowing air temperature and a set value, and outputs a signal for controlling the opening degree of the hot gas valve 12. Then, when the refrigeration operation is started, the flow rate of the hot gas guided to the bypass path 11 corresponds to the opening degree of the hot gas valve 12, and this hot gas is introduced into the evaporator 8. At the same time, the valve opening degree of the thermostatic expansion valve 6 is controlled so that the degree of superheat of the refrigerant at the outlet of the evaporator 8 becomes a predetermined value. Therefore, the flow rate of the refrigerant liquid passing through the thermostatic expansion valve 6 is increased compared to the case where hot gas pressure is applied to the expansion valve 6, and the refrigerant from the thermostatic expansion valve 6 is mixed with the hot gas from the bypass path 11. They join together at the inlet of the evaporator 8 and are introduced into the evaporator 8. Therefore, even when the set value is high and the refrigeration load is large, the temperature of the air blown from the evaporator 8 can be controlled to match the set value. In this way, even if the set value becomes high, the valve opening degree of the automatic temperature expansion valve 6 can be appropriately controlled and the temperature of the blown air can be adjusted, so that the refrigerating capacity in refrigeration operation can be expanded.
次に、上記設定値を−10℃以下に設定して制御
器２１に入力するとする。コントローラ１４内で
リターンセンサRSが選択される。制御器２１は
電磁三方弁１６に制御信号を出力して、電磁三方
弁１６は切換わつてオフとなり、制御通路１５は
遮断する一方、第１均圧管１９と第２均圧管２０
とは連通する。そして、吹込空気温度のもとに通
常の冷凍運転が行なわれることになる。 Next, it is assumed that the above set value is set to -10° C. or lower and input to the controller 21. Return sensor RS is selected within controller 14. The controller 21 outputs a control signal to the electromagnetic three-way valve 16, so that the electromagnetic three-way valve 16 is switched off and the control passage 15 is cut off, while the first pressure equalizing pipe 19 and the second pressure equalizing pipe 20 are switched off.
communicate with. Then, normal refrigeration operation will be performed under the blown air temperature.
なお、上記例において、電磁三方弁１６に代え
て２個の電磁二方弁を用いてもよい。また、別の
例としては、制御通路１５にのみ電磁二方弁を介
設した回路としてもよいものである。 In addition, in the above example, two electromagnetic two-way valves may be used instead of the electromagnetic three-way valve 16. Further, as another example, a circuit may be provided in which an electromagnetic two-way valve is provided only in the control passage 15.
また、冷蔵運転時において、サプライセンサ
SSにかえてリターンセンサRSで制御してもよ
い。 Also, during refrigeration operation, the supply sensor
The return sensor RS may be used instead of the SS for control.
〈考案の効果〉
以上の説明で明らかなように、この考案の冷凍
装置は、冷蔵運転において蒸発器からの吹出空気
温度の設定値が入力され、上記設定値が所定値よ
り低いか、所定値以上かに応じてバイパス路から
のホツトガス圧力を膨張弁に作用させるかまたは
蒸発器の出口圧力を膨張弁に作用させるように弁
を切換える制御信号を出力する制御手段を設けて
いる。しががつて、上記設定値を所定値よりも高
く設定し、冷凍負荷が大きい場合に、蒸発器の出
口圧力を膨張弁に作用して膨張弁を過熱度制御で
き、吹出空気温度を設定値に一致させるように制
御できる。すなわち、庫内空気温度の設定値に対
応して冷凍能力の制御範囲を拡大できる。<Effects of the invention> As is clear from the above explanation, the refrigeration system of this invention receives the set value of the temperature of the air blown from the evaporator during refrigeration operation, and if the set value is lower than the predetermined value or the predetermined value. Depending on the above, a control means is provided for outputting a control signal for switching the valve so that the hot gas pressure from the bypass passage acts on the expansion valve or the outlet pressure of the evaporator acts on the expansion valve. Therefore, if the above set value is set higher than the predetermined value and the refrigeration load is large, the outlet pressure of the evaporator can be applied to the expansion valve to control the degree of superheating of the expansion valve, and the blowing air temperature can be adjusted to the set value. can be controlled to match. That is, the control range of the refrigerating capacity can be expanded in accordance with the set value of the internal air temperature.
第１図はこの考案の実施例を示す冷媒配管系統
図、第２図は上記実施例のフローチヤート図であ
る。
１…圧縮機、２，４…凝縮器、６…膨張弁、８
…蒸発器、９，１０…管路、１１…バイパス路、
１５…制御通路、１６…弁、２１…制御弁。
FIG. 1 is a refrigerant piping system diagram showing an embodiment of this invention, and FIG. 2 is a flowchart of the above embodiment. 1... Compressor, 2, 4... Condenser, 6... Expansion valve, 8
...Evaporator, 9,10...Pipe line, 11...Bypass line,
15...control passage, 16...valve, 21...control valve.
Claims (1)
器８を順次連結して冷媒を循環させる冷凍回路を
形成すると共に、上記圧縮機１と上記凝縮器２，
４との間の管路９と上記蒸発器８と膨張弁６との
間の管路１０とを連結するホツトガス弁１２付き
のバイパス路１１を設け、さらに上記ホツトガス
弁１２の出口側のバイパス路１１から制御通路１
５を介して導かれるホツトガス圧力を上記膨張弁
６に作用させるかまたは上記蒸発器８出口圧力を
上記膨張弁６に作用させるように切換接続する弁
１６を設けて、冷蔵運転時に上記バイパス路１１
のホツトガス圧力を上記膨張弁６に作用させて、
均圧制御をし得るようにした冷凍装置において、 上記冷蔵運転時において上記蒸発器８を流通す
る空気の温度の設定値が入力され、上記設定値が
所定値以下のとき上記ホツトガス圧力を上記膨張
弁６に作用させ、上記設定値が所定値より高いと
き上記蒸発器８の出口圧力を上記膨張弁６に作用
させるように上記弁１６を切換える制御信号を出
力する制御手段２１を設けたことを特徴とする冷
凍装置。[Claims for Utility Model Registration] The compressor 1, the condensers 2 and 4, the expansion valve 6, and the evaporator 8 are connected in sequence to form a refrigeration circuit that circulates refrigerant, and the compressor 1 and the condenser 2 ，
A bypass path 11 with a hot gas valve 12 is provided to connect the pipe line 9 between the evaporator 8 and the expansion valve 6 to the pipe line 10 between the evaporator 8 and the expansion valve 6, and a bypass path on the outlet side of the hot gas valve 12. 11 to control passage 1
A valve 16 is provided to switch and connect the hot gas pressure introduced through the refrigeration valve 5 to the expansion valve 6 or the evaporator 8 outlet pressure to the expansion valve 6, so that the bypass path 11 is connected during refrigeration operation.
applying hot gas pressure to the expansion valve 6,
In a refrigeration system capable of pressure equalization control, a set value for the temperature of the air flowing through the evaporator 8 is input during the refrigeration operation, and when the set value is below a predetermined value, the hot gas pressure is adjusted to the expanded temperature. A control means 21 is provided for outputting a control signal that switches the valve 16 so that the outlet pressure of the evaporator 8 acts on the expansion valve 6 when the set value is higher than a predetermined value. Characteristic refrigeration equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19540785U JPH0248777Y2 (en) | 1985-12-18 | 1985-12-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19540785U JPH0248777Y2 (en) | 1985-12-18 | 1985-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62102966U JPS62102966U (en) | 1987-06-30 |
| JPH0248777Y2 true JPH0248777Y2 (en) | 1990-12-20 |
Family
ID=31153269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19540785U Expired JPH0248777Y2 (en) | 1985-12-18 | 1985-12-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0248777Y2 (en) |
-
1985
- 1985-12-18 JP JP19540785U patent/JPH0248777Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62102966U (en) | 1987-06-30 |
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