Night curtain device for open display refrigerator

Abstract

An energy-saving open display refrigerator is provided, comprising a refrigerating portion, a display compartment portion, and a night curtain device. The display compartment portion is provided on top of the refrigerating portion, and the display compartment portion is enclosed by two side walls, a rear wall, and ceiling wall, and the display compartment portion has a front opening defined by edges of the top wall, the two side walls, and the refrigerating portion. The night curtain device is installed at the front opening of the display compartment portion and configured for opening when a movement is detected in predetermined areas around the energy-saving open display refrigerator and closing down the front opening when any movement is not detected in the predetermined areas for a specific time period.

What is claimed is: 
     
         1 . An energy-saving open display refrigerator comprising:
 a refrigerating portion for cooling air disposed in a lower portion of the energy-saving open display refrigerator;   a display compartment portion provided on top of the the refrigerating portion, wherein the display compartment portion is enclosed by two side walls, a rear wall, and ceiling wall, and the display compartment portion has a front opening defined by edges of the top wall, the two side walls, and the refrigerating portion; and   a night curtain device disposed at the front opening of the display compartment portion and configured for opening when a movement is detected in predetermined areas around the energy-saving open display refrigerator and closing down the front opening when any movement is not detected in the predetermined areas for a specific time period.   
     
     
         2 . The energy-saving open display refrigerator of  claim 1 , wherein the display compartment portion further comprises a plurality of shelves. 
     
     
         3 . The energy-saving open display refrigerator of  claim 1 , further comprising one or more first motion detectors installed in the energy-saving open display refrigerator. 
     
     
         4 . The energy-saving open display refrigerator of  claim 1 , further comprising one or more second motion detectors installed at a plurality of external locations around the energy-saving open display refrigerator. 
     
     
         5 . The energy-saving open display refrigerator of  claim 1 , wherein the predetermined areas include a front area, side areas, and a rear area of the energy-saving open display refrigerator. 
     
     
         6 . The energy-saving open display refrigerator of  claim 1 , wherein the specific time period is adjustable on a control panel provided on the energy-saving open display refrigerator. 
     
     
         7 . The energy-saving open display refrigerator of  claim 1 , wherein the night curtain device is installed at a top edge, bottom edge, or side edges of the front opening. 
     
     
         8 . The energy-saving open display refrigerator of  claim 7 , wherein the night curtain device comprises:
 a roller installed at the edge thereof;   a rolling curtain configured for rolling to open or close the front opening and having a first end portion and a second portion, wherein the first end of the rolling curtain is attached to the roller; and   a driving electrical motor configured for driving the roller or the rolling curtain so as to roll out or in the rolling curtain around the roller.   
     
     
         9 . The energy-saving open display refrigerator of  claim 8 , wherein the night curtain device further comprises two guiding rails provided two edges of the front opening disposed perpendicularly to the edge of the front opening where the roller is installed, wherein the two guiding rails are configured to guide edges of the rolling curtain. 
     
     
         10 . The energy-saving open display refrigerator of  claim 7 , wherein the rolling curtain is transparent. 
     
     
         11 . The energy-saving open display refrigerator of  claim 7 , wherein the rolling curtain is opaque and a front surface of the rolling curtain is provided with pictures or patterns related to contents in the display compartment portion. 
     
     
         12 . The energy-saving open display refrigerator of  claim 1 , further comprising an air curtain device at the front opening.