3results about How to "Avoid ice blockage" patented technology

The application discloses a device and method for preventing pollution and blockage of a cold stage system of a scanning electron microscope, the device comprising a main low-temperature gas path system and a normal-temperature nitrogen branch, low-temperature nitrogen discharged from the main low-temperature gas path system is divided into two paths, and is respectively connected to a cold hydrazine and a cold stage and is independently controlled through a flow valve. In order to solve the problems that a sample is easily polluted and a gas path is easily blocked during temperature rising in the prior art, a normal-temperature nitrogen branch is additionally arranged on the cold stage gas path through a three-way valve. During a system temperature rising stage, the cold stage low-temperature gas path is closed and the normal-temperature nitrogen branch is opened, dry nitrogen is blown to the cold stage, the cold stage is rapidly heated under positive pressure protection, meanwhile, the cold hydrazine continuously obtains low-temperature nitrogen, and an ultralow temperature is maintained. The above-mentioned measures ensure that a large temperature difference (such as > 150 DEG C) always exists between the cold hydrazine and the cold stage, ensure that pollutants are preferentially captured by the cold hydrazine, effectively protect the surface of the sample to be clean, and fundamentally prevent the gas path from being blocked due to moisture backflow.

The utility model discloses a multi-stage filtering device of a fuel gas filter, and relates to the technical field of fuel gas filtering. The device comprises a tank body, the top of the tank body is fixedly provided with a top cover through bolts, the circumference of the tank body is fixedly connected with an input pipe and an output pipe which are communicated with each other, the input pipe and the output pipe are oppositely arranged, and the input pipe extends into the tank body; a drainage pipe is fixedly connected to the bottom of the tank body, a first control valve is fixedly mounted at the bottom of the drainage pipe, a concentration pipe for collecting water is fixedly mounted at the bottom of the first control valve, a discharge pipe is fixedly mounted at the bottom of the concentration pipe, and a second control valve is mounted at the bottom of the discharge pipe. When accumulated water in the tank body is discharged, a fuel gas pipeline does not need to be closed, the water discharging difficulty is lowered, fuel gas discharging is reduced, use is convenient, meanwhile, the input pipe can be heated by starting the heating wire, the temperature of fuel gas entering the tank body is increased, and the phenomenon of ice blockage caused by water vapor icing is avoided.

This application relates to the field of ice-making equipment technology, and discloses an ice-making device and its control method. The ice-making device includes an ice-making module for making ice and a refrigeration system for providing cooling capacity for ice making. The method includes: during the continuous operation of the refrigeration system for ice making, in response to meeting a preset drainage trigger condition, controlling the execution of a water replacement operation, the water replacement operation including: draining at least a portion of the water in the ice-making module; and after draining, resupplying water to the ice-making module. This application can inhibit scale deposition and maintain unobstructed venting, and reduces the impact on the ice-making speed.