Open-type display cabinet and refrigeration device thereof

Abstract

The invention discloses an open-type display cabinet and a refrigeration device thereof, which can be used to control the opening degree of the expansion valve to stabilize the temperature of the blown cool wind. The refrigeration device (R) is constituted by a plurality of open-type display cabinets (1) and a refrigerators (2). A main control device (12) and a terminal side control device (13) of each of the open-type display cabinet (1) can be used to control the opening degree of the expansion valve (11) by changing the superheat degree of an evaporator (9) to the target superheat degree. By setting the blown the cool wind at the predetermined temperature to the display cabinets as the reference, a plurality of control zones can be arranged, and the target superheat degree of the various control zones can be changed.

Description

technical field [0001] The present invention relates to an open showcase for displaying commodities while cooling and a freezer made of the same. Background technique [0002] Conventionally, many open showcases have been installed in stores such as supermarkets and convenience stores. And by blowing the cool air which exchanged heat with the evaporator of each open showcase into a showroom, it displays while cooling a product in this showroom. In addition, although the refrigerant is distributed and supplied to the evaporators of each open showcase from the compressor of the refrigerator constituting the refrigerant circuit of the refrigeration device together with the evaporator, the refrigerant supply to the evaporator is provided by the expansion unit connected to the inlet side. Valve to control (for example, refer to Patent Document 1). [0003] In addition, in recent years, a so-called electric expansion valve (also called an electronic expansion valve) driven by a ...

AI Technical Summary

Problems solved by technology

[0005] However, in general, the target superheat degree of the evaporator is fixed at a certain value (for example, 5 deg, etc.), so there may be cases where the blown air temperature drops excessively due to the load in the showroom (the amount of product input and the temperature of the outside air) and becomes fully closed. , and fall into the problem of immediately opening state

Therefore, it is conceivable to increase the target degree of superheat every certain period of time after the period when the temperature of the blown cold air is close to the set temperature, but this does not eliminate the problem of repeated opening and closing of the expansion valve, and thus the temperature of the blown cold air becomes unstable.

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