摘要:
In an ejector cycle system using carbon dioxide as refrigerant, an ejector decompresses and expands refrigerant from a radiator to suck gas refrigerant evaporated in an evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. Accordingly, energy converting efficiency in the ejector becomes higher, and efficiency of the ejector cycle system is improved.
摘要:
In an ejector cycle system using carbon dioxide as refrigerant, an ejector decompresses and expands refrigerant from a radiator to suck gas refrigerant evaporated in an evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. Accordingly, energy converting efficiency in the ejector becomes higher, and efficiency of the ejector cycle system is improved.
摘要:
In an ejector used for an ejector cycle system, a nozzle has a first refrigerant passage, a second refrigerant passage, and a third refrigerant passage in this order in a refrigerant flow direction from a refrigerant inlet toward a refrigerant outlet of the nozzle. The first refrigerant passage, the second refrigerant passage and the third refrigerant passage are formed into cylindrical shapes, respectively, each having a constant passage diameter. Further, a pressure increasing portion of the ejector is also formed into a cylindrical shape having a constant passage diameter. Accordingly, the ejector can be readily manufactured in low cost.
摘要:
A first evaporator connected to an outlet side of an ejector, a second evaporator connected to a refrigerant suction port of the ejector, a throttle mechanism arranged on an inlet side of a refrigerant flow of the second evaporator and for reducing the pressure of the refrigerant flow are provided. Furthermore, the ejector, the first evaporator, the second evaporator and the throttle mechanism are assembled integrally with each other to construct an integrated unit having one refrigerant inlet and one refrigerant outlet. Hence, mounting performance of an ejector type refrigeration cycle can be improved.
摘要:
In a refrigerant cycle device having an ejector, a branch portion for branching a flow of refrigerant flowing out of the ejector into at least a first refrigerant stream and a second refrigerant stream is located. A first evaporator for evaporating the refrigerant of the first refrigerant stream is located to allow the refrigerant to flow to a suction side of the compressor, and a second evaporator for evaporating the refrigerant of the second refrigerant stream is located to allow the refrigerant to flow to an upstream side of a refrigerant suction port of the ejector. In addition, the branch portion is located to maintain a dynamic pressure of the refrigerant flowing out of the ejector, and the second evaporator is connected to the branch portion in a range where the dynamic pressure can be applied to an inside of the second evaporator.
摘要:
An ejector cycle with an ejector includes a nozzle for decompressing refrigerant. A receiver for storing refrigerant is disposed at a refrigerant outlet side of a condenser. A bypass passage and a switching valve for opening and closing the bypass passage are provided so that high-temperature refrigerant discharged from a compressor is introduced into an evaporator while bypassing the condenser in a defrosting operation. When the defrosting operation is set, the switching valve is opened while a fan for blowing cool air to the condenser is operated. A part of refrigerant discharged from the compressor flows into the evaporator to remove frost on a surface of the evaporator.
摘要:
A refrigerant flow-amount controlling device for an ejector refrigerant cycle system includes an ejector having a nozzle for decompressing refrigerant of a first stream of a branch portion, a first evaporator for evaporating refrigerant flowing out of the ejector, a throttle member for decompressing refrigerant of a second stream of the branch portion, a second evaporator disposed downstream of the throttle member and upstream of a refrigerant suction portion of the ejector, and an adjusting mechanism having a temperature-sensitive deformation member that is deformed in accordance with a variation in a refrigerant temperature of the cycle system to adjust one refrigerant passage area of the nozzle portion and the throttle means. The adjusting mechanism can be provided to adjust a flow ratio of a refrigerant amount decompressed by the nozzle portion of the ejector and a refrigerant amount drawn into the refrigerant suction port of the ejector.
摘要:
An ejector-type refrigerant cycle device includes: a first evaporator 15 that evaporates refrigerant flowing out of an ejector 14; a branch passage 17 that branches a flow of refrigerant between a radiator 13 and the ejector 14 and guides this flow of refrigerant to a vapor-phase refrigerant suction port 14c of the ejector 14; a throttling mechanism 18 disposed in the branch passage 17; and a second evaporator 19 disposed downstream of the throttling mechanism 18 with respect to the flow of refrigerant. The throttling mechanism 18 is constructed to be provided with a fully opening function, and to fully open the branch passage 17 when the second evaporator 19 is defrosted. Therefore, in an ejector-type refrigerant cycle device including multiple evaporators, the function of defrosting the evaporators can be carried out with a simple construction.
摘要:
A nozzle (41) is made of a sintered metal, and a pressure increasing portion (a mixing portion (42) and a diffuser (43)) is manufactured by plastic-forming a metal pipe. Accordingly, the nozzle (41) can be manufactured in a short time while high accuracy in machining is maintained. Thus, the cost of manufacturing an ejector (40) can be reduced.
摘要:
A double-wall pipe includes an outer pipe provided with first and second openings, respectively, at first and second end parts of the outer pipe in a pipe longitudinal direction, and an inner pipe inserted in the outer pipe to define a passage between the outer pipe and the inner pipe. An inlet portion is connected to the outer pipe to communicate with the passage through the first opening, and an outlet portion is connected to the outer pipe to communicate with the passage through the second opening. In the double-wall pipe, the outer pipe and the inner pipe can be disposed to define an expanded portion having an expanded sectional area in the first passage, and the expanded portion can be provided at least at a portion near the inlet portion and the outer portion. The inner pipe can be provided with plural grooves in the double-wall pipe.