A refrigeration device (100) having a closed circuit (C) within which a refrigerant fluid circulates and provided with a compressor and at least one shut-off valve (105) operable between an open position and a closed position to regulate the flow of refrigerant fluid through at least one evaporator depending on the temperature required by the user, the closed circuit includes at least one secondary by-pass branch (200) having an inlet section (201) and an outlet section (202) respectively arranged downstream (D) and upstream (U) of said at least one compressor (101) for the passage of said refrigerant fluid.

A throttling device, including a tank for accommodating liquid refrigerant, with an orifice plate arranged at an outlet of the tank; a floating ball capable of floating on a liquid surface of the refrigerant; a pivot rod pivotally fixed on the tank through a pivot shaft; a connecting rod, with one end thereof fixedly connected with the floating ball, and the other end thereof fixedly connected with the pivot rod; a valve plate fixed on the pivot rod and located near an orifice of the orifice plate, wherein the valve plate is capable of adjusting a flow area of the orifice under the action of the pivot rod; and a limit piece located above the valve plate and being movable to limit the valve plate.

A throttling device, including a tank for accommodating liquid refrigerant, with an orifice plate arranged at an outlet of the tank; a floating ball capable of floating on a liquid surface of the refrigerant; a pivot rod pivotally fixed on the tank through a pivot shaft; a connecting rod, with one end thereof fixedly connected with the floating ball, and the other end thereof fixedly connected with the pivot rod; a valve plate fixed on the pivot rod and located near an orifice of the orifice plate, wherein the valve plate is capable of adjusting a flow area of the orifice under the action of the pivot rod; and a limit piece located above the valve plate and being movable to limit the valve plate.

An electronic expansion valve and an assembly method therefor. The electronic expansion valve includes a screw rod component, a movable connection component, a valve pin component and an elastic element. One end of the elastic element abuts the movable connection component, and the other end thereof abuts the valve pin component. In the period from the valve pin component closing the valve port part to the screw rod component moving a pre-set displacement amount in the valve closing direction, the elastic element does not generate an elastic force pushing the valve pin component towards the valve port part; and in the period from the valve pin component closing the valve port part to in a case that the screw rod component moving more than the pre-set displacement amount in the valve closing direction, the elastic element generates an elastic force pushing the valve pin component towards the valve port part.

Refrigeration device (100) having a closed circuit (C) within which a refrigerant fluid circulates, said closed circuit comprising at least one compressor (101), at least one condenser (102), expansion means (103) of said refrigerant fluid, at least one evaporator (104) to thermally condition at least one user (UT), and at least one shut- off valve (105) operable between an open position and a closed position to regulate the flow of refrigerant fluid through said at least one evaporator depending on the temperature required by said user, said closed circuit further comprising at least one secondary by-pass branch (200) having an inlet section (201) and an outlet section (202) respectively arranged downstream (D) and upstream (U) of said at least one compressor (101) for the passage of said refrigerant fluid, said secondary by-pass branch (200) comprising at least one passage valve (204) operable between an open position, to allow the fluid to recirculate between said secondary by-pass branch (200) and said at least one compressor (101), and a closed position, to prevent the passage of fluid through said secondary by-pass branch, characterized by comprising means (106) to prevent the backflow of said refrigerant fluid from said condenser to said compressor, at least when said passage valve (204) is open, said means to prevent the backflow of said refrigerant fluid being arranged between said condenser and said inlet section (201) of said secondary by-pass branch (200).

A refrigerator includes a main body that has a storage chamber and a drying chamber; a thermoelectric module that includes a heat absorber and a heat dissipater; a cooling fan that circulates air in the storage chamber to the heat absorber and the storage chamber; a heat-dissipating fan that blows air to the heat dissipater; an air guide that has a passage for guiding air heated by the heat dissipater to the drying chamber; a heater that is disposed in the passage; and a damper that controls a flow of air in the passage between the heat-dissipating fan and the heater. Heat of the heat dissipater transfers to the drying chamber through the passage of the air guide and the damper, thereby being able to dry an object to be dried.

A refrigeration system, including: a compressor, a condenser, an economizer, a throttle valve, and an evaporator which are connected via a pipeline; and a pneumatic valve that includes a valve body and a drive gas phase refrigerant chamber, an gas phase refrigerant outlet of the economizer being connected to an interstage gas phase refrigerant inlet of the compressor via the valve body, and the drive gas phase refrigerant chamber being connected to a low pressure portion of the refrigeration system via a first gas phase refrigerant path, the lower pressure portion having a pressure lower than that in the economizer; wherein a first valve for controlling on/off of the first gas phase refrigerant path is disposed on the first gas phase refrigerant path. The refrigeration system can avoid liquid phase refrigerant accumulated in the economizer from entering the compressor during start to cause a liquid impact problem.

A refrigeration unit includes a compressor, a first heat exchanger, a second heat exchanger, a water pump, and a heat exchanging arrangement. The heat exchanging arrangement includes a main casing having a receiving cavity divided into a water atomizing compartment and one water showering compartment, a water atomizing unit, a water showering head, a fill material unit provided underneath the water showering head, and a water collection basin provided underneath the water atomizing unit and the fill material unit. A predetermined amount of heated water from the first heat exchanger is guided to flow to the water showering head and the water in the water showering head is sprinkled on the fill material unit. A predetermined amount of water from the water pump is guided to flow to the water atomizing unit and the water flowing to the water atomizing unit is sprayed and atomized in the water atomizing compartment.

An electronic expansion valve and an assembly method therefor. The electronic expansion valve includes a screw rod component, a movable connection component, a valve pin component and an elastic element. One end of the elastic element abuts the movable connection component, and the other end thereof abuts the valve pin component. In the period from the valve pin component closing the valve port part to the screw rod component moving a pre-set displacement amount in the valve closing direction, the elastic element does not generate an elastic force pushing the valve pin component towards the valve port part; and in the period from the valve pin component closing the valve port part to in a case that the screw rod component moving more than the pre-set displacement amount in the valve closing direction, the elastic element generates an elastic force pushing the valve pin component towards the valve port part.

A method of maintaining a fluid flow rate in a heating, ventilating, air conditioning, and refrigeration (HVAC-R) system while maintaining superheat in the HVAC-R system at a desired level includes: continuously measuring an operating fluid temperature of the HVAC-R system and calculating superheat at a pre-determined rate, determining if the calculated superheat is stable, measuring and recording an operating fluid pressure of the system each time the calculated superheat is stable, recording an average operating fluid pressure each subsequent time the superheat is stable, calculating an output PWM and reducing fluid flow through a metering valve when an actual PWM is greater than the calculated output PWM by adjusting a PWM signal to a microvalve in the metering valve, and increasing fluid flow through the metering valve when the actual PWM is less than the calculated output PWM by adjusting the PWM signal to the microvalve.