Standalone and self-contained cooling systems using compressed liquid and/or gas C0.sub.2 containers positioned in an insulated or non-insulated vessel and consisting of a specially designed unit where the containers are vertically positioned in an upright or upside-down position. The liquid and/or gas CO2 coolant is then released into capillary tube(s) embedded into a heat transfer plate or heat exchanger thus leveraging the C0.sub.2 coolant properties. The temperature is controlled by a metering C0.sub.2 releasing system encompassing an electronic control device which can be operated remotely and/or via a touch screen and which sends alerts when pre-defined thresholds are exceeded. The invention's metering C0.sub.2 releasing system may be triggered by an electronic or a thermostatic valve or may be triggered manually or by an electronic solenoid. The invention's cooling system also encompasses check valves, which avoid liquid and/or gas C0.sub.2 from escaping when removing or replacing C0.sub.2 containers individually.

The refrigerator of the present disclosure is configured such that a hot gas flow path is in contact with a return flow path. Therefore, a refrigerant recovered by a compressor after defrosting one evaporator via the hot gas flow path and cooling the other evaporator is in a gaseous state, thereby protecting the compressor.

The present invention provides a connecting pipeline of evaporator, an evaporator, and a refrigerator. The connecting pipeline is configured to connect with the refrigerant inlet of the evaporator and comprises first pipeline, second pipeline and inlet pipeline connected in sequence, wherein the inlet pipeline is connected to the refrigerant inlet, and the inner diameter of the first pipeline is larger than the inner diameter of the second pipeline. The connecting pipeline of the evaporator can effectively reduce noise by being configured to comprise first pipeline, second pipeline and inlet pipeline connected in sequence, wherein the inlet pipeline is connected to the refrigerant inlet and the inner diameter of the first pipeline is larger than the inner diameter of the second pipeline.

A cooling system includes a subcooling heat exchange assembly, which controls magnitude of subcooling of refrigerant circulated through the cooling system. The subcooling heat exchange assembly includes a first fluid line fluidly coupled to an output of a condenser to enable a first portion of the refrigerant output from the condenser to flow through the first fluid line; a second fluid line fluidly coupled to the output of the condenser to enable a second portion of the refrigerant output from the condenser to flow through the second fluid line; and an expansion valve disposed along the second fluid line, in which the expansion valve exerts a first pressure drop on the second portion of the refrigerant that facilitates extracting heat from the first portion of the refrigerant flowing through the first fluid line using the second portion of the refrigerant flowing through the second fluid line when valve position of the expansion valve is greater than a threshold position. Additionally the cooling system includes a plurality of capillary expansion tubes fluidly coupled in parallel to an output of the first fluid line and that to exert a second pressure drop on the refrigerant circulated through the cooling system.

A cooling system includes an expansion valve configured to exert a first pressure drop on refrigerant circulated through the cooling system. The cooling system also includes a plurality of capillary expansion tubes fluidly coupled in parallel to an output of the expansion valve and configured to exert a second pressure drop on the refrigerant circulated through the cooling system. The cooling system also includes a controller communicatively coupled to the expansion valve, wherein the controller is configured to control magnitude of the first pressure drop by instructing the expansion valve to adjust the valve position based at least in part on refrigerant mass flow expected to be supplied to the expansion valve to facilitate substantially uniformly distributing the refrigerant mass flow between each of the plurality capillary expansion tubes.

An exemplary heat pump (10) includes: a compressor (16A, 16B) that discharges refrigerant; an oil separator (30) that separates oil from the refrigerant discharged from the compressor; an oil return channel (80) that returns the oil separated by the oil separator to the compressor; a pressure sensor (86A, 86B) that detects a pressure in the oil return channel; a first pressure loss member (84A, 84B) and a second pressure loss member (88A, 88B) disposed in portions of the oil return channel at an oil separator side and a compressor side relative to the pressure sensor; and a control device that increases an output of the compressor in a case where a pressure detected by the pressure sensor exceeds a suction pressure of the compressor and less than a discharge pressure of the compressor.

A refrigeration device includes: a refrigerant circuit in which a compressor, a condenser, a decompressor, and an evaporator are connected circularly in the stated order; and a regenerative refrigerator including a heat dissipation portion that compresses a working fluid enclosed in a chamber and dissipates heat produced by compression, and a heat absorption portion in which the working fluid compressed in the heat dissipation portion is expanded. A refrigerant in the condenser is cooled by heat exchange between the condenser and the heat absorption portion.

An air conditioning device including a condenser configured to condense a refrigerant gas into a liquid refrigerant, an evaporator configured to phase-change the liquid refrigerant introduced from the condenser into a vapor refrigerant, a refrigerant inlet pipe connected to the evaporator and into which a refrigerant is introduced from the condenser, a capillary tube fully inserted into the refrigerant inlet pipe, and a clamping portion depressed a part of the refrigerant inlet pipe and a part of the capillary tube corresponding to the depressed part of the refrigerant inlet pipe to fix the capillary tube inside the refrigerant inlet pipe.

An air conditioning device including a condenser configured to condense a refrigerant gas into a liquid refrigerant, an evaporator configured to phase-change the liquid refrigerant introduced from the condenser into a vapor refrigerant, a refrigerant inlet pipe connected to the evaporator and into which a refrigerant is introduced from the condenser, a capillary tube fully inserted into the refrigerant inlet pipe, and a clamping portion depressed a part of the refrigerant inlet pipe and a part of the capillary tube corresponding to the depressed part of the refrigerant inlet pipe to fix the capillary tube inside the refrigerant inlet pipe.

A refrigerator includes a compressor, a condenser, an evaporator, switching valve, an ice-making device, a controller, and a first refrigerant pipe and a second refrigerant pipe connected between the condenser and the evaporator. The switching valve is configured to guide the refrigerant condensed in the condenser to the first refrigerant pipe or the second refrigerant pipe. The ice-making device allows the first refrigerant pipe to pass therethrough and is configured to cool water stored in an ice-making tray. The controller is configured to control the switching valve to guide the refrigerant to the ice-making device through the first refrigerant pipe. In response to a temperature of the ice-making tray falling to a level lower than or equal to a reference temperature, the controller is configured to control the switching valve to prevent the refrigerant from being guided to the first refrigerant pipe and supply water to the ice-making tray.