Refrigeration cycle device
A refrigeration cycle and refrigerant technology, which is applied to refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of increased input power and reduced efficiency of refrigeration cycle device 700, and achieves the effect of stable starting.
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Embodiment approach 1
[0063]
[0064] figure 1 It is a configuration diagram of the refrigeration cycle apparatus 100 according to Embodiment 1 of the present invention. Such as figure 1 As shown, the refrigerating cycle device 100 has a main circuit formed by sequentially connecting a high-pressure compressor 101, a radiator 102, an expander 103, a gas-liquid separator 108, an evaporator 104, and a low-pressure compressor 105 through flow paths 106a to 106f. Refrigerant circuit 106. The flow paths 106a to 106f are each constituted by refrigerant piping. An expansion valve 110 is provided on the flow path 106 d between the gas-liquid separator 108 and the evaporator 104 . A check valve 132 is provided in the flow path 106 e between the evaporator 104 and the low-pressure stage compressor 105 . Hereinafter, the flow path 106f connecting the discharge port of the low-pressure stage compressor 105 and the suction port of the high-pressure stage compressor 101 is also referred to as "intermedia...
Deformed example 1
[0127]
[0128] image 3 It is a block diagram of the refrigeration cycle apparatus 200 of the modification 1. Such as image 3 As shown, in the refrigeration cycle apparatus 200 , the flow path switching mechanism is constituted by the three-way valve 133 . A PTC (Positive Temperature Coefficient: positive temperature coefficient) heater 140 and a current detector 141 are used as the activation detector 119 . Furthermore, a bypass channel 201 and a bypass valve 202 are provided. Other configurations are the same as those in Embodiment 1. In this modified example, the same reference numerals are assigned to the same components as those in Embodiment 1, and detailed description thereof will be omitted.
[0129] A three-way valve 133 as a channel switching mechanism is provided at the downstream end E of the high-pressure introduction channel 130 so as to be mutually switchable between the first state and the second state. 2 , the first state is a state in which the refri...
Deformed example 2
[0142] Figure 5 It is a block diagram of the refrigeration cycle apparatus 300 of the modification 2. Such as Figure 5 As shown, the refrigeration cycle apparatus 300 differs from Embodiment 1 in that a temperature detector for detecting the temperature of the refrigerant at the discharge port of the low-pressure stage compressor 105 is used as the start detector 119 . In this modified example, the same reference numerals are assigned to common components common to those in Embodiment 1, and detailed description thereof will be omitted.
[0143] In the case of using a temperature detector as the start detector 119, for example, the threshold T obtained by experiments or theory 2 It is preset in the controller 117. When the value obtained by subtracting the temperature detected by the temperature detector at the time traced back by the unit time from the current temperature detected by the temperature detector exceeds the prescribed threshold value T 2 , the start of the ...
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