130results about How to "Lower freezing temperature" patented technology

The invention discloses a multi-temperature-region ice-temperature fresh keeping storehouse and a fresh keeping method for bergamot pears. The multi-temperature-region ice-temperature fresh keeping storehouse for the bergamot pears comprises a precooling region, a feeding and discharging channel, a cooling region, an ice temperature detecting device, a grading device, a conveyer belt control device, an automatic storing device, and a temperature rise and fall buffering channel, wherein the cooling region comprises four freezers, and the four freezers are respectively a first freezer of which the storing temperature is 0 DEG C, a second freezer of which the storing temperature is minus 1 DEG C, a third freezer of which the storing temperature is minus 2 DEG C, and a fourth freezer of which the storing temperature is minus 3 DEG C; and the four freezers are connected level by level according to a temperature lapse rule. According to the multi-temperature-region ice-temperature fresh keeping storehouse disclosed by the invention, multi-temperature-region graded storage of the bergamot pears is realized according to the value of ice temperature. Compared with conventional static ice temperature storage, the multi-temperature-region ice-temperature fresh keeping storehouse and the fresh keeping method for the bergamot pears disclosed by the invention have the advantages that the storing partitions of the bergamot pears can be dynamically adjusted according to the changes of the ice point temperature of the bergamot pears, so that the situation that the bergamot pears are always stored under the condition of being close to the ice point temperature can be guaranteed, the bergamot pear fruits are prevented from freeze injury, and the shelf life of the bergamot pears is prolonged.

Disclosed herein is a gray cast iron having high strength and reduced casting defects. The high-strength gray cast iron may include: an amount of about 3.10 to 3.50 wt % of carbon (C), an amount of about 2.10 to 2.40 wt % of silicon (Si), an amount of about 0.50 to 0.80 wt % of manganese (Mn), an amount less than or equal to about 0.10 wt % (not including 0%) of phosphorus (P), an amount less thanor equal to about 0.10 wt % (not including 0%) of sulfur (S), an amount of about 0.25 to 0.45 wt % of chromium (Cr), an amount of about 1.00 to 1.40 wt % of copper (Cu), an amount less than or equalto about 0.20 wt % (not including 0%) of nickel (Ni), and a balance of iron (Fe), all the wt % are based on the total weight of the gray cast iron. In particular, the gray cast iron may include a carbon equivalent (CEQ) of about 3.95 to 4.1% calculated by the Equation 1.