JPH0419043B2 - - Google Patents
Info
- Publication number
- JPH0419043B2 JPH0419043B2 JP63104333A JP10433388A JPH0419043B2 JP H0419043 B2 JPH0419043 B2 JP H0419043B2 JP 63104333 A JP63104333 A JP 63104333A JP 10433388 A JP10433388 A JP 10433388A JP H0419043 B2 JPH0419043 B2 JP H0419043B2
- Authority
- JP
- Japan
- Prior art keywords
- evaporator
- pressure
- compressor
- temperature
- refrigerator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 claims description 44
- 239000003507 refrigerant Substances 0.000 claims description 32
- 238000005057 refrigeration Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 description 11
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004941 influx Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/323—Cooling devices using compression characterised by comprising auxiliary or multiple systems, e.g. plurality of evaporators, or by involving auxiliary cooling devices
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は運転室及び冷蔵庫を備える車両に用い
られる冷蔵冷房装置に関し、特に運転室を冷房す
るために用いられる蒸発器と冷蔵庫を冷却するた
めに用いられる蒸発器とを備える車両用冷蔵冷房
装置に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a refrigerating and cooling device used in a vehicle equipped with a driver's cab and a refrigerator, and particularly for cooling an evaporator and a refrigerator used for cooling the driver's cab. The present invention relates to a vehicle refrigerating/cooling device including an evaporator used in a vehicle.
（従来の技術）
従来、この種の冷蔵冷房装置として第２図に示
す装置が知られている。(Prior Art) Conventionally, a device shown in FIG. 2 has been known as this type of refrigerating device.
第２図を参照して、この冷蔵冷房装置は圧縮機
１、凝縮器２、運転室の冷房に用いられる蒸発器
５、及び冷蔵庫の冷却に用いられる蒸発器６を備
えており、凝縮器２は受液器（レシーバドライ
ヤ）１５及び膨張弁１７を介して蒸発器６に接続
され、この蒸発器６は逆止弁７を介して圧縮機１
に接続されている。一方、受液器１５は、電磁弁
１６及び感温式膨張弁３を介して蒸発器５に接続
され、この蒸発器５は圧縮機１に接続されてい
る。上記の感温式膨張弁３は蒸発器５の出側の冷
媒温度によつて弁開度を変えている。 Referring to FIG. 2, this refrigerator/air conditioner is equipped with a compressor 1, a condenser 2, an evaporator 5 used for cooling the driver's cabin, an evaporator 6 used for cooling the refrigerator, and a condenser 2. is connected to the evaporator 6 via a liquid receiver (receiver dryer) 15 and an expansion valve 17, and this evaporator 6 is connected to the compressor 1 via a check valve 7.
It is connected to the. On the other hand, the liquid receiver 15 is connected to an evaporator 5 via a solenoid valve 16 and a temperature-sensitive expansion valve 3, and this evaporator 5 is connected to a compressor 1. The above temperature-sensitive expansion valve 3 changes its opening degree depending on the refrigerant temperature on the outlet side of the evaporator 5.
上述の冷蔵冷房装置では、電磁弁１６を開閉す
ることによつて蒸発器５の冷媒の流入を規制して
いる。即ち、電磁弁１６を開とした場合のみ蒸発
器５へ冷媒を流している。 In the above-mentioned refrigerating and cooling apparatus, the inflow of refrigerant into the evaporator 5 is regulated by opening and closing the solenoid valve 16. That is, refrigerant is allowed to flow into the evaporator 5 only when the solenoid valve 16 is opened.
（発明が解決しようとする課題）
ところで、冷房の際には、冷媒の蒸発温度は５
℃程度で十分であり、一方、冷蔵の場合には製氷
の必要も考慮すると、冷媒蒸発温度は−10℃〜−
20℃程度必要である。従つて、上述の冷蔵冷房装
置の場合、電磁弁１６を開いて、蒸発器５及び６
に冷媒を流した時（即ち、蒸発器５及び６を並列
運転した時）、冷蔵に適した温度の冷媒を流す必
要があるから、即ち、蒸発器６への冷媒流量を多
くしなければならず、冷房能力が低下するととい
う問題点があり、冷房能力をあげようとすれば、
圧縮機容量を大きくしなければならない。(Problem to be solved by the invention) By the way, during cooling, the evaporation temperature of the refrigerant is 5
℃ is sufficient.On the other hand, in the case of refrigeration, considering the need for ice making, the refrigerant evaporation temperature is -10℃ to -
A temperature of about 20℃ is required. Therefore, in the case of the above-mentioned refrigerating device, the solenoid valve 16 is opened and the evaporators 5 and 6 are closed.
When the refrigerant is flowed into the evaporator 6 (that is, when the evaporators 5 and 6 are operated in parallel), it is necessary to flow the refrigerant at a temperature suitable for refrigeration, that is, the flow rate of refrigerant to the evaporator 6 must be increased. First, there is the problem that the cooling capacity decreases, and if you try to increase the cooling capacity,
Compressor capacity must be increased.
一方、上述の冷蔵冷房装置では、冷房能力と冷
蔵能力とが大きく異なるため（例えば自動車用冷
房装置では2000〜6000kcal／時、冷蔵庫を200l程
度と考えれば100kcal／時程度である）、電磁弁１
６を閉とした際、瞬時に冷却負下が小さくなるた
め、圧縮機１の吸入圧力が急激に低下し（負圧近
くまで低下し）、その結果、圧縮機１を停止しな
ければならず、冷蔵庫の冷却が行われなくなつて
しまう。 On the other hand, in the above-mentioned refrigerator/air conditioner, the cooling capacity and the refrigeration capacity are significantly different (for example, in an automobile cooling system, it is 2000 to 6000 kcal/hour, and if a refrigerator is about 200 liters, it is about 100 kcal/hour), so the solenoid valve 1
6 is closed, the cooling negative pressure instantly decreases, so the suction pressure of the compressor 1 suddenly decreases (to nearly negative pressure), and as a result, the compressor 1 must be stopped. , the refrigerator no longer cools.
さらに、定圧膨張弁等を用いて圧縮機１の吸入
圧力を一定に保つように制御した場合、液状冷媒
が圧縮機１に吸入され、圧縮機１が破損してしま
う恐れがある。 Furthermore, if the suction pressure of the compressor 1 is controlled to be kept constant using a constant pressure expansion valve or the like, there is a risk that liquid refrigerant will be sucked into the compressor 1 and the compressor 1 will be damaged.
（課題を解決するための手段）
本発明によれば、運転室及び冷蔵庫を備える車
両に用いられ、圧縮機と、該圧縮機の出側に接続
された凝縮器と、前記運転室の冷房に用いられる
第１の蒸発器と、前記冷蔵庫の冷却に用いられる
第２の蒸発器とを有する冷蔵冷房装置であつて、
前記第１の蒸発器の入側は第１の制御弁及び第１
の減圧手段を介して前記凝縮器の出側に接続さ
れ、前記第２の蒸発器の入側は第２の制御弁及び
第２の減圧手段を介して前記凝縮器の出側に接続
され前記第２の蒸発器の出側は予め定められた方
向に冷媒を流す逆止弁を介して前記第１の蒸発器
の入側に接続されており、前記冷蔵庫の温度を検
知して検出温度として送出する温度検出素子と、
前記圧縮機の吸入圧力を検知して検出吸入圧力と
して送出する圧力検知手段と、前記冷蔵庫の冷蔵
設定温度が予め設定されるとともに前記吸入圧力
の第１の設定圧力及び該第１の設定圧力より高い
第２の設定圧力が予め設定され、前記検出温度が
前記冷蔵設定温度に達する前に前記検出吸入圧力
が前記第１の設定圧力以下になると前記第１及び
前記第２の制御弁を開制御し、前記検出吸入圧力
が前記第２の設定圧力になると前記第１の制御弁
を閉制御するとともに前記第２の制御弁を開制御
する制御手段とを有することを特徴とする車両用
冷蔵冷房装置が得られる。(Means for Solving the Problems) According to the present invention, the present invention is used in a vehicle equipped with a driver's cab and a refrigerator, and includes a compressor, a condenser connected to the outlet side of the compressor, and a compressor for cooling the driver's cab. A refrigerating and cooling device having a first evaporator used for cooling the refrigerator and a second evaporator used for cooling the refrigerator,
The inlet side of the first evaporator is connected to a first control valve and a first
The inlet side of the second evaporator is connected to the outlet side of the condenser via a second control valve and a second pressure reducing means. The outlet side of the second evaporator is connected to the inlet side of the first evaporator via a check valve that allows refrigerant to flow in a predetermined direction, and the temperature of the refrigerator is detected and used as the detected temperature. A temperature detection element to send out,
pressure detection means for detecting the suction pressure of the compressor and sending it out as the detected suction pressure; a refrigeration set temperature of the refrigerator is set in advance; A high second set pressure is set in advance, and if the detected suction pressure becomes equal to or lower than the first set pressure before the detected temperature reaches the refrigeration set temperature, the first and second control valves are controlled to open. and a control means for controlling the first control valve to close and controlling the second control valve to open when the detected suction pressure reaches the second set pressure. A device is obtained.
（作用）
本発明では、第１の蒸発器と凝縮器とが第１の
制御弁及び第１の減圧手段を介して接続され、第
２の蒸発器と凝縮器とが第２の制御弁及び第２の
減圧手段を介して接続されとともに第２の蒸発器
は予め定められた方向（第２の蒸発器から第１の
蒸発器へ冷媒を流す方向）に冷媒を流す逆止弁を
介して第２の蒸発器に接続されている。そして、
制御手段は検出冷蔵温度及び検出吸入圧力に基づ
いて第１及び第２の制御弁を開閉制御する。つま
り、制御手段は検出冷蔵温度が冷蔵設定温度に達
する前に検出吸入圧力が第１の設定圧力以下にな
ると第１及び前記第２の制御弁を開制御し、検出
吸入圧力が第２の設定圧力になると第１の制御弁
を閉制御するとともに第２の制御弁を開制御す
る。このように冷蔵庫の検出温度及び検出吸入圧
力によつて第１及び第２の制御弁を制御している
から、冷房能力に影響を与えることはない。ま
た、第２の蒸発器からの冷媒は常に第１の蒸発器
へ流れるから圧縮機圧力の急激な低下がない。(Function) In the present invention, the first evaporator and the condenser are connected via the first control valve and the first pressure reducing means, and the second evaporator and the condenser are connected via the second control valve and the first pressure reducing means. The second evaporator is connected via a second pressure reducing means, and the second evaporator is connected via a check valve that allows the refrigerant to flow in a predetermined direction (direction in which the refrigerant flows from the second evaporator to the first evaporator). connected to a second evaporator. and,
The control means controls opening and closing of the first and second control valves based on the detected refrigeration temperature and the detected suction pressure. That is, the control means controls the first and second control valves to open when the detected suction pressure becomes equal to or lower than the first set pressure before the detected refrigeration temperature reaches the refrigeration set temperature, so that the detected suction pressure reaches the second set pressure. When the pressure is reached, the first control valve is controlled to close and the second control valve is controlled to open. Since the first and second control valves are thus controlled based on the detected temperature and suction pressure of the refrigerator, the cooling capacity is not affected. Furthermore, since the refrigerant from the second evaporator always flows to the first evaporator, there is no sudden drop in compressor pressure.
（実施例） 以下本発明について実施例によつて説明する。(Example) The present invention will be explained below with reference to Examples.
第１図を参照して、この冷蔵冷房装置は圧縮機
１、この圧縮機１の吐出側に接続された凝縮器
２、運転室の冷房に用いられる蒸発器５、及び冷
蔵庫の冷却に用いられる蒸発器６を備えている。
凝縮器２は受液器（レシーバドライヤー）１５を
介して電磁弁１３及び１４に接続されている。電
磁弁１３は感温式膨張弁３を介して蒸発器５に接
続されており、蒸発器５は圧縮機１の吸入側に接
続されている。感温式膨張弁３は蒸発器５の出側
の冷媒温度を検知し、この検知冷媒温度に基づい
て弁開度を調節する。 Referring to FIG. 1, this refrigerating and cooling system includes a compressor 1, a condenser 2 connected to the discharge side of the compressor 1, an evaporator 5 used for cooling the driver's cabin, and a refrigerator used for cooling. It is equipped with an evaporator 6.
The condenser 2 is connected to electromagnetic valves 13 and 14 via a liquid receiver (receiver dryer) 15. The electromagnetic valve 13 is connected to the evaporator 5 via the temperature-sensitive expansion valve 3, and the evaporator 5 is connected to the suction side of the compressor 1. The temperature-sensitive expansion valve 3 detects the refrigerant temperature on the outlet side of the evaporator 5, and adjusts the valve opening degree based on the detected refrigerant temperature.
一方、電磁弁１４はキヤピラリーチユーブ等の
固定絞り弁４を介して蒸発器６に接続され、蒸発
器６の出側は逆止弁７を介して蒸発器５の入側に
接続されている。 On the other hand, the solenoid valve 14 is connected to the evaporator 6 via a fixed throttle valve 4 such as a capillary reach tube, and the outlet side of the evaporator 6 is connected to the inlet side of the evaporator 5 via a check valve 7. .
運転室内にはサーミスタ等の温度検出素子１０
が配置され、冷蔵庫内にはサーミスタ等の温度検
出素子１１が配置され、また圧縮機１の吸入側に
は冷媒吸入圧力を検出するための圧力スイツチ等
の圧力検出素子８が配置されている。これら温度
検出素子１０及び１１と圧力検出素子８は制御装
置１８に接続され、後述するように圧縮機１をオ
ンオフするための電磁クラツチ９、電磁弁１３及
び１４を制御する。 There is a temperature detection element 10 such as a thermistor in the driver's cabin.
A temperature detecting element 11 such as a thermistor is disposed inside the refrigerator, and a pressure detecting element 8 such as a pressure switch for detecting refrigerant suction pressure is disposed on the suction side of the compressor 1. These temperature detection elements 10 and 11 and pressure detection element 8 are connected to a control device 18, which controls an electromagnetic clutch 9 and electromagnetic valves 13 and 14 for turning on and off the compressor 1, as will be described later.
次に上述の冷蔵冷房装置について冷媒をＲ１２
として説明する。 Next, for the above-mentioned refrigerator/air conditioner, the refrigerant is R12.
It will be explained as follows.
運転室の冷房を行う場合、冷房スイツチ１９が
投入される。これによつて制御装置１８は電磁ク
ラツチ９をオンとして圧縮機１を駆動するととも
に電磁弁１３を開とする（電磁弁１４は閉）。圧
縮機１から吐出された冷媒は凝縮器２、受液器１
５、電磁弁１３、感温式膨張弁３、及び蒸発器５
を通つて、圧縮機１に房り、蒸発器５により運転
室が冷房される。運転室が所定の温度にまで冷房
されたことが温度検出素子１０によつて検知され
ると、制御装置８は電磁クラツチ９をオフして圧
縮機１を停止する。このように制御装置１８は温
度検出素子１０の検出温度に基づいて圧縮機１を
オンオフしている。この際、蒸発器５内の冷媒
は、感温式膨張弁３によつて蒸発器５の出側にお
ける冷媒過熱度が一定になるように制御される。
なお、冷媒の蒸発圧力は２〜３Kg／cm2Ｇである。 When cooling the driver's cabin, the cooling switch 19 is turned on. As a result, the control device 18 turns on the electromagnetic clutch 9 to drive the compressor 1 and opens the electromagnetic valve 13 (the electromagnetic valve 14 is closed). The refrigerant discharged from the compressor 1 is sent to the condenser 2 and receiver 1.
5, solenoid valve 13, temperature-sensitive expansion valve 3, and evaporator 5
The air flows through the compressor 1, and the evaporator 5 cools the driver's cabin. When the temperature detection element 10 detects that the cab has been cooled to a predetermined temperature, the control device 8 turns off the electromagnetic clutch 9 and stops the compressor 1. In this way, the control device 18 turns on and off the compressor 1 based on the temperature detected by the temperature detection element 10. At this time, the refrigerant in the evaporator 5 is controlled by the temperature-sensitive expansion valve 3 so that the degree of superheat of the refrigerant on the outlet side of the evaporator 5 is constant.
Note that the evaporation pressure of the refrigerant is 2 to 3 kg/cm 2 G.
上述の冷房運転状態において、冷蔵庫を冷却す
る場合、冷蔵スイツチ２０が投入されると、制御
装置１８は電磁弁１３を閉、電磁弁１４を開とす
る。この結果、圧縮機１からの冷媒は凝縮器２、
受液器１５、電磁弁１４、キヤピラリーチユーブ
４、蒸発器６、逆止弁７、及び蒸発器５を通つて
圧縮機１に房る。これによつて、蒸発器６によつ
て冷蔵庫が冷却され、一方、蒸発器６で蒸発しき
れない液冷媒が蒸発器５にはいり、蒸発器５によ
つて運転室が冷房されるので、冷房運転が完全に
とぎれることはない。また冷蔵庫の熱負荷は圧縮
機１の能力に比較し、非常に小さい（1/20〜1/6
０）ので、キヤピラリーチユーブ４で絞られるこ
とにより所望の蒸発温度例えば−15℃〜−10℃
（蒸発圧力0.8〜1.2Kg／cm2Ｇ）程度すばやく下が
り、短時間で冷蔵庫内を冷却するので、冷房運転
に影響を与えることも少ない。このように、キヤ
ピラリーチユーブ等の固定絞り装置を用いて所定
の絞り量に設定し、蒸発器５及び６を直列に接続
しておくことにより、圧縮機吸入圧力の急激な低
下及び圧縮機１への液もどりを防止している。 When cooling the refrigerator in the above-mentioned cooling operation state, when the refrigeration switch 20 is turned on, the control device 18 closes the solenoid valve 13 and opens the solenoid valve 14. As a result, the refrigerant from the compressor 1 is transferred to the condenser 2,
The liquid flows into the compressor 1 through the liquid receiver 15, the electromagnetic valve 14, the capillary tube 4, the evaporator 6, the check valve 7, and the evaporator 5. As a result, the refrigerator is cooled by the evaporator 6, and on the other hand, the liquid refrigerant that has not been completely evaporated by the evaporator 6 enters the evaporator 5, and the evaporator 5 cools the driver's cabin. Driving never stops completely. Also, the heat load of the refrigerator is very small compared to the capacity of compressor 1 (1/20 to 1/6
0), the desired evaporation temperature can be set by narrowing the capillary reach tube 4, e.g. -15°C to -10°C.
(Evaporation pressure 0.8 to 1.2 Kg/cm 2 G) quickly decreases and cools the inside of the refrigerator in a short time, so it has little effect on cooling operation. In this way, by setting a predetermined throttling amount using a fixed throttling device such as a capillary reach tube and connecting the evaporators 5 and 6 in series, a sudden drop in the compressor suction pressure and a This prevents liquid from returning to the tank.
蒸発器６により冷蔵庫が予め設定された温度ま
で冷却されたことが温度検出素子１１により検知
されると、制御装置１８は電磁弁１３を開、電磁
弁１４を閉として、蒸発器６の冷媒への流入を停
止する。その結果、圧縮機１からの冷媒は蒸発器
５のみに流れ、運転室が冷房される。このよう
に、制御装置１８は温度検出素子１１の検出温度
に基づいて電磁弁１３及び１４を開閉制御する。 When the temperature detection element 11 detects that the refrigerator has been cooled to a preset temperature by the evaporator 6, the control device 18 opens the solenoid valve 13, closes the solenoid valve 14, and supplies the refrigerant to the evaporator 6. stop the influx of As a result, the refrigerant from the compressor 1 flows only to the evaporator 5, and the driver's cabin is cooled. In this way, the control device 18 controls the opening and closing of the electromagnetic valves 13 and 14 based on the temperature detected by the temperature detection element 11.
ところで、上述の冷蔵冷房運転の際、冷蔵庫の
冷房負荷が極めて小さく、その結果、圧縮機１の
吸入圧力が予め定められた第１の設定値（低圧側
設定値）以下となつたことが圧力スイツチ８で検
知されると（例えば、吸入圧力が0.5Kg／cm2Ｇ）、
制御装置１３は電磁弁１３を開とする（電磁弁１
４は開）。その結果、圧縮機１からの冷媒は感温
式膨張弁３及びキヤピラリーチユーブ４に流れ、
蒸発器５で冷房が行われ、蒸発器６で冷却が行わ
れる。即ち、冷蔵冷房運転が行われ、圧縮機１の
吸入圧力が上昇する。吸入圧力が上昇して予め定
められた第２の設定値（高圧側設定値）、例えば
２Kg／cm2Ｇとなると、これが圧力スイツチ８で検
知され、制御装置１８は電磁弁１３を閉とする。
その結果、圧縮機１からの冷媒はキヤピラリーチ
ユーブ４のみを通つて流れる。 By the way, during the above-mentioned refrigeration cooling operation, the cooling load on the refrigerator was extremely small, and as a result, the suction pressure of the compressor 1 became less than the predetermined first set value (low pressure side set value). When detected by switch 8 (for example, suction pressure is 0.5Kg/cm 2 G),
The control device 13 opens the solenoid valve 13 (solenoid valve 1
4 is open). As a result, the refrigerant from the compressor 1 flows to the temperature-sensitive expansion valve 3 and the capillary reach tube 4,
The evaporator 5 performs cooling, and the evaporator 6 performs cooling. That is, the refrigeration/cooling operation is performed, and the suction pressure of the compressor 1 increases. When the suction pressure increases to a predetermined second set value (high pressure side set value), for example, 2 kg/cm 2 G, this is detected by the pressure switch 8, and the control device 18 closes the solenoid valve 13. .
As a result, the refrigerant from the compressor 1 flows only through the capillary reach tube 4.
冷蔵運転のみを行う場合には、冷蔵スイツチ２
０が投入される（冷房スイツチ１９はオフ）。そ
の結果、制御装置１８は電磁弁１３を閉、電磁弁
１４を開とするとともに電磁クラツチ９をオンし
て圧縮機１を駆動する。圧縮機１からの冷媒は凝
縮器２、受液器１５、電磁弁１４、キヤピラリー
チユーブ４、蒸発器６、逆止弁７、及び蒸発器５
を通つて圧縮機５へ戻り、蒸発器６で冷蔵庫が冷
却される。 When performing only refrigeration operation, set refrigeration switch 2.
0 is input (cooling switch 19 is off). As a result, the control device 18 closes the solenoid valve 13, opens the solenoid valve 14, and turns on the solenoid clutch 9 to drive the compressor 1. The refrigerant from the compressor 1 is transferred to a condenser 2, a liquid receiver 15, a solenoid valve 14, a capillary reach tube 4, an evaporator 6, a check valve 7, and an evaporator 5.
The air returns to the compressor 5 through the evaporator 6, where the refrigerator is cooled.
冷蔵庫内が予め定められた温度に達したことが
温度検出素子１１で検知されると、制御装置１８
は電磁クラツチ９をオフして圧縮機１を停止する
とともに電磁弁１４を閉とする。 When the temperature detection element 11 detects that the inside of the refrigerator has reached a predetermined temperature, the control device 18
The solenoid clutch 9 is turned off to stop the compressor 1 and the solenoid valve 14 is closed.
一方、冷蔵庫内の温度が上記の設定温度に達す
る前に、即ち、温度検出素子１１が作動する前
に、圧力スイツチ８により圧縮機吸入圧力が第１
の設定圧力（例えば、0.5Kg／cm2Ｇ）以下となつ
たことが検知されると、制御装置１８は電磁弁１
３を開とする。この結果、圧縮機１の吸入圧力が
上昇し、圧力スイツチ８により圧縮機吸入圧力が
第２の設定圧力（例えば、2.0Kg／cm2Ｇ）となつ
たことが検知されると、制御装置１８は電磁弁１
３を閉とする。なお、電磁弁１３及び１４が開の
状態で冷蔵庫が予め定められた温度に達すると、
制御装置１８は電磁クラツチ９をオフとして圧縮
機１を停止するとともに、電磁弁１３及び１４を
閉とする。 On the other hand, before the temperature inside the refrigerator reaches the above set temperature, that is, before the temperature detection element 11 is activated, the pressure switch 8 sets the compressor suction pressure to the first level.
When it is detected that the set pressure of
Let's open 3. As a result, the suction pressure of the compressor 1 increases, and when the pressure switch 8 detects that the compressor suction pressure has reached the second set pressure (for example, 2.0 Kg/cm 2 G), the control device 18 is solenoid valve 1
3 is closed. Note that when the refrigerator reaches a predetermined temperature with the solenoid valves 13 and 14 open,
The control device 18 turns off the electromagnetic clutch 9 to stop the compressor 1 and closes the electromagnetic valves 13 and 14.
上述の場合、冷媒は蒸発器５を通過するが、冷
房スイツチ１９が投入されていない状態では、蒸
発器５用の冷房用送風フアン（図示せず）は駆動
されておらず（停止）、そのため、冷風が送出さ
れることがなく、また冷蔵運転は極めて短時間で
あるから、実用上問題はない。 In the above case, the refrigerant passes through the evaporator 5, but when the cooling switch 19 is not turned on, the cooling fan (not shown) for the evaporator 5 is not driven (stopped), so Since cold air is not sent out and the refrigeration operation is extremely short, there is no practical problem.
ところで、冬期等冷房を必要としない期間で
は、冷蔵庫の熱負荷は少ないから、電磁弁１３は
常に閉じた状態としておき、圧力スイツチ８の検
知圧力及び温度検出素子１１の検知温度によつて
圧縮機１のオンオフ制御を行い、冷蔵庫冷却を行
つてもよい。 By the way, during periods such as winter when cooling is not required, the heat load on the refrigerator is small, so the solenoid valve 13 is always closed, and the compressor is controlled by the pressure detected by the pressure switch 8 and the temperature detected by the temperature detection element 11. Refrigerator cooling may be performed by performing the on/off control of 1.
（発明の効果）
以上説明したように本発明では、冷房能力に対
する影響を最小限に押え、冷蔵庫を冷却している
から、圧縮機容量を大きくする必要がなく、冷蔵
冷房装置を安価に提供できる。(Effects of the Invention) As explained above, in the present invention, since the refrigerator is cooled while minimizing the influence on the cooling capacity, there is no need to increase the compressor capacity, and the refrigerator/cooler can be provided at low cost. .
また、冷蔵用蒸発器からの冷媒は常に冷房用蒸
発器に流れるから圧縮機吸入圧力の急激な低下を
防ぐことができるばかりでなく、圧縮機へ液状冷
媒が流れ込むことを防止できる。 Furthermore, since the refrigerant from the refrigeration evaporator always flows to the cooling evaporator, it is possible not only to prevent a sudden drop in the compressor suction pressure, but also to prevent liquid refrigerant from flowing into the compressor.
第１図は本発明による冷蔵冷房装置を示す図、
第２図は従来の冷蔵冷房装置を示す図である。
１……圧縮機、２……凝縮器、３……感温式膨
張弁、４……キヤピラリーチユーブ、５……蒸発
器、６……蒸発器、７……逆止弁、８……圧力ス
イツチ、９……電磁クラツチ、１０，１１……温
度検出素子、１３，１４……電磁弁、１５……受
液器（レシーバドライヤー）、１８……制御装置、
１９……冷房スイツチ、２０……冷蔵スイツチ。
FIG. 1 is a diagram showing a refrigerating and cooling device according to the present invention;
FIG. 2 is a diagram showing a conventional refrigerating and cooling device. 1... Compressor, 2... Condenser, 3... Temperature-sensitive expansion valve, 4... Capillary reach tube, 5... Evaporator, 6... Evaporator, 7... Check valve, 8... Pressure switch, 9... Electromagnetic clutch, 10, 11... Temperature detection element, 13, 14... Solenoid valve, 15... Liquid receiver (receiver dryer), 18... Control device,
19... Cooling switch, 20... Refrigeration switch.
Claims (1)
圧縮機と、該圧縮機の出側に接続された凝縮器
と、前記運転室の冷房に用いられる第１の蒸発器
と、前記冷蔵庫の冷却に用いられる第２の蒸発器
とを有する冷蔵冷房装置であつて、前記第１の蒸
発器の入側は第１の制御弁及び第１の減圧手段を
介して前記凝縮器の出側に接続され、前記第２の
蒸発器の入側は第２の制御弁及び第２の減圧手段
を介して前記凝縮器の出側に接続され前記第２の
蒸発器の出側は予め定められた方向に冷媒を流す
逆止弁を介して前記第１の蒸発器の入側に接続さ
れており、前記冷蔵庫の温度を検知して検出温度
として送出する温度検出素子と、前記圧縮機の吸
入圧力を検知して検出吸入圧力として送出する圧
力検知手段と、前記冷蔵庫の冷蔵設定温度が予め
設定されるとともに前記吸入圧力の第１の設定圧
力及び該第１の設定圧力より高い第２の設定圧力
が予め設定され、前記検出温度が前記冷蔵設定温
度に達する前に前記検出吸入圧力が前記第１の設
定圧力以下になると前記第１及び前記第２の制御
弁を開制御し、前記検出吸入圧力が前記第２の設
定圧力になると前記第１の制御弁を閉制御すると
ともに前記第２の制御弁を開制御する制御手段と
を有することを特徴とする車両用冷蔵冷房装置。1 Used in vehicles equipped with a driver's cab and refrigerator,
A refrigerated air conditioner comprising a compressor, a condenser connected to the outlet side of the compressor, a first evaporator used for cooling the driver's cabin, and a second evaporator used for cooling the refrigerator. In the apparatus, the inlet side of the first evaporator is connected to the outlet side of the condenser via a first control valve and a first pressure reducing means, and the inlet side of the second evaporator is connected to the outlet side of the condenser through a first control valve and a first pressure reducing means. The outlet side of the second evaporator is connected to the outlet side of the condenser via a second control valve and a second pressure reducing means, and the outlet side of the second evaporator is connected to the outlet side of the first evaporator via a check valve that allows refrigerant to flow in a predetermined direction. a temperature detection element connected to the inlet side of the evaporator and configured to detect the temperature of the refrigerator and output the detected temperature; and a pressure detection element configured to detect the suction pressure of the compressor and output it as the detected suction pressure. , a refrigeration set temperature of the refrigerator is set in advance, a first set pressure of the suction pressure and a second set pressure higher than the first set pressure are set in advance, and the detected temperature is equal to the refrigeration set temperature. If the detected suction pressure becomes equal to or lower than the first set pressure, the first and second control valves are controlled to open, and when the detected suction pressure reaches the second set pressure, the first control is performed. A refrigerating and cooling device for a vehicle, comprising a control means for controlling a valve to close and for controlling an opening of the second control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63104333A JPH01275219A (en) | 1988-04-28 | 1988-04-28 | Refrigerating and cooling device for vehicular use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63104333A JPH01275219A (en) | 1988-04-28 | 1988-04-28 | Refrigerating and cooling device for vehicular use |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01275219A JPH01275219A (en) | 1989-11-02 |
| JPH0419043B2 true JPH0419043B2 (en) | 1992-03-30 |
Family
ID=14378012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63104333A Granted JPH01275219A (en) | 1988-04-28 | 1988-04-28 | Refrigerating and cooling device for vehicular use |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01275219A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006017959A1 (en) * | 2004-08-19 | 2006-02-23 | Hisense Group Co., Ltd. | Composite refrigerator having multi-cycle refrigeration system and control method thereof |
| WO2006101566A1 (en) * | 2005-03-18 | 2006-09-28 | Carrier Commercial Refrigeration, Inc. | High side pressure regulation for transcritical vapor compression |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5977524A (en) * | 1982-10-26 | 1984-05-04 | Nisshin Kogyo Kk | Method and device for controlling temperature in refrigerating chamber |
| JPS6029577A (en) * | 1983-07-27 | 1985-02-14 | 株式会社東芝 | Refrigerator |
-
1988
- 1988-04-28 JP JP63104333A patent/JPH01275219A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5977524A (en) * | 1982-10-26 | 1984-05-04 | Nisshin Kogyo Kk | Method and device for controlling temperature in refrigerating chamber |
| JPS6029577A (en) * | 1983-07-27 | 1985-02-14 | 株式会社東芝 | Refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01275219A (en) | 1989-11-02 |
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