Refrigerating system and ice cream maker

Abstract

The invention discloses a refrigerating system. The refrigerating system comprises a compressor, a condenser, a throttling device, an evaporator, a temperature sensing device and an air returning pipe, wherein the compressor is connected with the condenser, the throttling device and the evaporator in sequence; one end of the air returning pipe is connected with an outlet end of the evaporator and the other end of the air returning pipe is connected with an inlet end of the compressor; the temperature sensing device is fixedly mounted on the air returning pipe and an included angle of 45 degrees is formed between the temperature sensing device and the horizontal radial direction of the air returning pipe; a heat preservation sleeve sleeves the temperature sensing device along the axial direction of the air returning pipe; the heat preservation sleeve is wound by a waterproof material. According to the refrigerating system, the influences on the temperature sensing device caused by the fluctuation of refrigerating fluid at the outlet end of the evaporator and the temperature sensing accuracy of a temperature sensing bag caused by the outer environment temperature are greatly reduced; the temperature sensing accuracy is improved and the refrigeration of the refrigerating system is sufficient; the stable operation and the efficient refrigeration of the system are realized. The invention further provides an ice cream maker and the ice cream maker is provided with the refrigerating system.

Description

technical field [0001] The invention relates to the technical field of food refrigeration, in particular to a refrigeration system. The invention also relates to an ice cream machine equipped with such a refrigeration system. Background technique [0002] At present, the refrigeration system of the ice cream machine generally uses a compressor to compress the refrigerant and drive it to circulate in the refrigeration system pipeline, so as to realize the freezing of the ice cream slurry. [0003] In a refrigeration system, in order to exchange heat with a low-temperature object, it is necessary to reduce the pressure of the refrigerant-saturated liquid below the saturation pressure corresponding to the saturation temperature lower than that of the low-temperature object. At present, a throttling and pressure-reducing device such as a thermal expansion valve is generally installed at the inlet of the evaporator, and a temperature-sensing device such as a temperature-sensing ...

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Problems solved by technology

[0004] However, in the current refrigeration system, the refrigerant coming out of the evaporator may not be completely gaseous refrigerant, and the incompletely vaporized low-temperature liquid refrigerant is deposited at the bottom of the return air pipe, and the temperature sensing bulb is usually installed at the outlet end of the evaporator. Directly above the return air pipe, what the temperature sensor senses is usually not the real superheat of the refrigerant in the evaporator, but only the superheat of the gaseous refrigerant that is completely vaporized in the upper part, which in turn causes the refrigerant entering the throttling device The flow rate is not coordinated with the real superheat of the refrigerant in the evaporator, and the adjustment of the refrigerant flow rate entering the throttling device by the refrigeration system will be deviated.

[0005] In addition, due to the lack of thermal insulation treatment of the temperature-sensing package, the working condition of the internal temperature-sensing working medium is not only affected by the fluctuation of the refrigerant flow rate at the outlet end of the evaporator, but also by the external ambient temperature near the refrigeration system, so often Inaccurate temperature sensing or frequent fluctuations will cause the flow and pressure of the refrigerant entering the throttling device to be unstable, which will affect the superheat of the refrigerant coming out of the evaporator, and eventually cause the refrigerant to evaporate incompletely in the evaporator, resulting in refrigeration. The effect is not good, and the non-gaseous refrigerant coming out of the evaporator may even cause liquid shock in the compressor

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