JP2010121831A5

JP2010121831A5 -

Info

Publication number: JP2010121831A5
Application number: JP2008294844A
Authority: JP
Filing date: 2008-11-18
Publication date: 2012-01-05

Description

第４、第５、第６実施例の冷凍サイクル１４、１５、１６に使用されている膨張弁１１４、１１５、１１６は、前述した第１、第２、第３実施例の冷凍サイクル１１、１２、１３に使用されている膨張弁１１１、１１２、１１３では設けられていた感温用流入口３１及び流出口３２は設けられておらず、蒸発器１０３からの低温の冷媒は、膨張弁１１４、１１５、１１６内を通らずに直接内部熱交換器１０４に導かれるようになっている。 The expansion valves 114, 115, 116 used in the refrigeration cycles 14, 15, 16 of the fourth, fifth, and sixth embodiments are the same as the refrigeration cycles 11, 12 of the first, second, and third embodiments described above. , 13 is not provided with the temperature-sensitive inlet 31 and outlet 32 provided in the expansion valves 111, 112, and 113, and the low-temperature refrigerant from the evaporator 103 is supplied to the expansion valves 114, 115 and 116 are guided directly to the internal heat exchanger 104 without passing through.

第４実施例の冷凍サイクル１４は、前述した第２実施例の冷凍サイクル１２と同様に、圧縮機１０１の吸入側に導かれる、内部熱交換器１０４で熱交換を行った後の低温冷媒の温度を感知すべく、感温筒７０を内部熱交換器１０４と圧縮機１０１の吸入側とを結ぶ導管１２５に近接配置するとともに、図６に示される如くに、感温筒７０と膨張弁１１４の上側圧力室４３とをキャピラリーチューブ７２で結び、膨張弁１１４において、蒸発器１０３へ導出される冷媒の流量を前記熱交換後の低温冷媒の温度に応じて調整するようにしたものである。また、この例で使用されている膨張弁１１４の弁本体２０には、下側圧力室４４と流出口２２とを連通する内部圧力通路６６が設けられている。 The refrigeration cycle 14 of the fourth embodiment is similar to the refrigeration cycle 12 of the second embodiment described above. The low-temperature refrigerant after the heat exchange in the internal heat exchanger 104 is guided to the suction side of the compressor 101. In order to sense the temperature, the temperature sensing cylinder 70 is disposed close to the conduit 125 connecting the internal heat exchanger 104 and the suction side of the compressor 101, and as shown in FIG. 6, the temperature sensing cylinder 70 and the expansion valve 114 are arranged. The upper pressure chamber 43 is connected by a capillary tube 72, and the expansion valve 114 adjusts the flow rate of the refrigerant led to the evaporator 103 in accordance with the temperature of the low-temperature refrigerant after the heat exchange. In addition, the valve body 20 of the expansion valve 114 used in this example is provided with an internal pressure passage 66 that communicates the lower pressure chamber 44 and the outlet 22.

第５実施例の冷凍サイクル１５は、前述した第１実施例の冷凍サイクル１１と同様に、圧縮機１０１の吸入側に導かれる、内部熱交換器１０４で熱交換を行った後の低温冷媒の圧力を感知すべく、内部熱交換器１０４と圧縮機１０１の吸入側とを結ぶ導管１２５の途中に外部圧力導入管５０の一端部を連結するとともに、外部圧力導入管５０の他端部を膨張弁１１５の下側圧力室４４と外部とを連通するＬ形状の圧力導入通路５４に接続し、膨張弁１１５において、蒸発器１０３へ導出される冷媒の流量を前記熱交換後の低温冷媒の圧力に応じて調整するようにしたものである。なお、ここでは、感温筒７０を蒸発器１０３と内部熱交換器１０４とを結ぶ導管１２４（蒸発器１０３の出口近傍）に近接配置し、感温筒７０と膨張弁１１５の上側圧力室４３とがキャピラリーチューブ７２で結ばれている。 The refrigeration cycle 15 of the fifth embodiment is similar to the refrigeration cycle 11 of the first embodiment described above. The low-temperature refrigerant after the heat exchange in the internal heat exchanger 104 is guided to the suction side of the compressor 101. In order to sense the pressure, one end of the external pressure introduction pipe 50 is connected to the middle of the conduit 125 connecting the internal heat exchanger 104 and the suction side of the compressor 101, and the other end of the external pressure introduction pipe 50 is expanded. The lower pressure chamber 44 of the valve 115 is connected to an L-shaped pressure introduction passage 54 communicating with the outside. In the expansion valve 115, the flow rate of the refrigerant led to the evaporator 103 is changed to the pressure of the low-temperature refrigerant after the heat exchange. It adjusts according to. Here, the temperature sensing cylinder 70 is disposed close to a conduit 124 (near the outlet of the evaporator 103) connecting the evaporator 103 and the internal heat exchanger 104, and the upper pressure chamber 43 of the temperature sensing cylinder 70 and the expansion valve 115 is disposed. Are connected by a capillary tube 72.

第６実施例の冷凍サイクル１６は、第４実施例の冷凍サイクル１４及び第５実施例の冷凍サイクル１４を組み合わせたもので、外部圧力導入管５０及び感温筒７０の両方を備えており、それに使用される膨張弁１１６の下側圧力室４４周りは第５実施例のものと略同様であり、上側圧力室４３周りは第４実施例のものと略同様に構成されていて、膨張弁１１６において、蒸発器１０３へ導出される冷媒の流量を前記熱交換後の低温冷媒の圧力及び温度に応じて調整するようにしたものである。 The refrigeration cycle 16 of the sixth embodiment is a combination of the refrigeration cycle 14 of the fourth embodiment and the refrigeration cycle 14 of the fifth embodiment, and includes both the external pressure introduction pipe 50 and the temperature sensing cylinder 70, The area around the lower pressure chamber 44 of the expansion valve 116 used therefor is substantially the same as that of the fifth embodiment, and the area around the upper pressure chamber 43 is substantially the same as that of the fourth embodiment. In 116, the flow rate of the refrigerant led to the evaporator 103 is adjusted according to the pressure and temperature of the low-temperature refrigerant after the heat exchange.