41results about How to "Guaranteed subcooling" patented technology

The invention discloses a full-fresh-air air handling unit capable of overcooling and overheating synchronously. The full-fresh-air air handling unit comprises a compressor, a four-way reversing valve, an outdoor handling unit heat exchanger, a bi-directional expansion valve and an indoor air supply unit heat exchanger. An air inlet end and an air outlet end of the compressor are connected with two opposite connectors on the four-way reversing valve respectively, a refrigeration inlet of the outdoor handling unit heat exchanger and a refrigeration outlet of the indoor air supply unit heat exchanger are connected with the other two opposite connectors on the four-way reversing valve respectively, and a refrigeration outlet of the outdoor handling unit heat exchanger is connected with a refrigeration inlet of the indoor air supply unit heat exchanger through the bi-bidirectional expansion valve. The full-fresh-air air handling unit effectively solves the problem of loss of obtained overcooling degree, improves the stability and reliability of working of the expansion valve, avoids wet compression of the compressor, can improve safety and reliability of the unit, and increases working energy efficiency ratio.

A heat utilization balance processor relates to a heat exchanger unit for a heat pump hot water machine or a refrigerating cycle system, and in particular relates to a heat utilization balance processor which is suitable for R407C environment-friendly refrigerant. A heat exchange tube is coiled into a spiral shape and arranged in a main heat exchanging cavity; a vapor separation barrel of a vapor-liquid separator is arranged at the lower half part in a shell; an auxiliary heat exchanging cavity is formed between the lower half part of the shell and the outer periphery of the vapor separation barrel; the upper part of the main heat exchanging cavity is communicated to a working medium inlet outside the shell; the main heat exchanging cavity is communicated with the auxiliary heat exchanging cavity through a working medium passage hole; the bottom of the auxiliary heat exchanging cavity is communicated to a working medium outlet outside the shell; and a heat medium water passage is arranged inside the heat exchanging pipe. Through heat utilization balance exchange on the working medium in the process of condensation and evaporation in the auxiliary heat exchanging cavity, the problem of unbalanced phase change process caused by phase change non-isothermal characteristic of non-azeotropic mixing working medium R407C is solved, and the influence of the temperature slippage of the mixed refrigerant on the operation performance and safety of the equipment is eliminated.

The invention provides a refrigeration cycle system for a freezer, including a compressor, a condenser, an evaporator, and a capillary tube. Inlet and outlet of high-pressure refrigerant and inlet and outlet of low-pressure refrigerant. The supercooled liquid receiver is equipped with inlet and outlet of supercooled refrigerant liquid, inlet and outlet of two-phase refrigerant, and outlet of saturated refrigerant vapor; the outlet of the condenser is connected to the high pressure of the regenerator. The refrigerant inlet and the high-pressure refrigerant outlet are connected to the supercooled liquid receiver. There is a supercooled refrigerant liquid inlet, and the high-pressure refrigerant outlet is connected to the evaporator inlet through a capillary tube; the evaporator outlet is connected to the two-phase refrigerant inlet, and the saturated refrigerant vapor outlet is connected The low-pressure refrigerant inlet and the low-pressure refrigerant outlet are connected to the compressor. The invention can ensure that the evaporator performs two-phase heat exchange in the whole evaporation process, significantly increases the heat transfer coefficient of the evaporator, and improves the heat exchange effect.

The invention discloses a device for refining grain structure and an application method, and belongs to the technical field of metallurgy. The device comprises a vibration device inserted in a steel ingot mold; the vibration device includes a vibration rod making direct contact with molten steel; the vibration rod is provided with a vibration generation source for driving the vibration rod to move; an introduction pipe for circulating a cooling medium is arranged in the center of the vibration rod; and discharge pipes for circulating the cooking medium are arranged on two sides of the upper end of the vibration rod. A steel ingot is vibrated in the solidification process to urge fusing and breakage of dendrites; and the number of free cold crystals is increased to inhibit growth of columnar crystals, so that the isometric crystal rate is increased, the solidification structure is refined, and the purpose of relieving segregation is achieved.

The invention discloses a control method for reducing the noise of an indoor unit of an air conditioner, the air conditioner includes an outdoor unit and an indoor unit, the indoor unit includes an expansion valve of the indoor unit, the outdoor unit includes a compressor and an outdoor heat exchanger, and, A subcooler is also provided between the outdoor heat exchanger and the expansion valve of the indoor unit, and the subcooler includes a subcooler expansion valve; the control method includes the steps of: S10, controlling the air conditioner in cooling mode Start up; S20, control the opening degree EXV1 of the expansion valve of the subcooler and the opening degree EXV2 of the expansion valve of the internal unit, so as to establish the system subcooling degree and ensure the superheating degree of the internal unit. The control method of the present invention can reduce the cavitation noise of the indoor unit when the air conditioner is refrigerated and starts running, and can effectively solve the problem of the liquid flow noise of the indoor unit. The invention also discloses a multi-connected air conditioner.

The invention relates to a heat pump unit using a two-stage heat exchanger. According to the two-stage heat exchanger of the heat pump unit, the interior of a shell is divided into a first-stage heat exchange cavity and a second-stage heat exchange cavity through a partition plate, a first-stage heat exchange pipe is arranged in the first-stage heat exchange cavity, and a second-stage heat exchange pipe is arranged in the second-stage heat exchange cavity. When the supercooling degree of the first-stage heat exchange pipe is small, the second-stage heat exchange pipe can be put into use together; firstly, superheated refrigerant steam in the first-stage heat exchange cavity rapidly exchanges heat with cooling water in the first-stage heat exchange pipe and then is condensed into liquid refrigerant; then, the liquid refrigerant enters the second-stage heat exchange cavity, the liquid refrigerant in the second-stage heat exchange pipe is evaporated or saturated refrigerant steam absorbs heat of the liquid refrigerant in the second-stage heat exchange cavity, and therefore the refrigerant in the second-stage heat exchanger can be sufficiently supercooled before throttling; and because of the thermal insulation effect of the partition plate, when heat exchange is conducted in the first-stage heat exchange cavity and the second-stage heat exchange cavity, heat conduction in the first-stage heat exchange cavity and heat conduction in the second-stage heat exchange cavity are not likely to influence each other, and therefore the heat exchange efficiency of the heat pump unit can be higher.

The invention discloses an ultra-low-pressure single-tower cryogenic air separation process. The process comprises the compression of air or oxygen-rich air, dewatering, purification and heat exchange of the air or the oxygen-rich air, compression and heat exchange of nitrogen, expansion refrigeration of nitrogen or air, preparation of liquid nitrogen or liquid air (or liquid oxygen-rich air), preparation of gas oxygen and gas nitrogen by ultra-low-pressure single-tower distillation and other steps. As the distillation is completely operated under the single-tower low pressure and a nitrogen compressor is provided, the purity of the liquid nitrogen is completely ensured, the distillation process is easy to operate, the resistance is small, the low liquid-gas ratio can be adopted, and the process can realize energy conservation, low project cost, convenient operation and regulation, flexible product proposal and easy formation of a large-scale combined oxygen-making unit with an oxygen-rich device, thereby reducing energy consumption, realizing large-scale devices and greatly improving nitrogen output under the same oxygen-making amount.