Steam and liquid return protection device

Abstract

The invention discloses a steam and liquid return protection device externally arranged on a condensing coil pipe of a condenser of a refrigeration system of a freeze dryer. The steam and liquid return protection device comprises a liquid collecting pipe buffer, a horizontal pipe, a first U-shaped bent pipe, a vertical pipe, a second U-shaped bent pipe, a return steam buffer pipe, a compressor, awater condenser, a liquid outlet pipe, a capillary pipe, a return steam cooling control valve, two cooling valves connected to the outlet end of the liquid outlet pipe in parallel, two expansion valves and a liquid conveying pipe. The liquid collecting pipe buffer and the return steam buffer pipe are additionally arranged at the outlet end of the condensing coil pipe, so that the compressor is prevented from being damaged by liquid impact; and meanwhile, the return steam cooling control valve and the capillary pipe are additionally arranged, the return steam buffer pipe is cooled under the condition of high return steam temperature, the cooling time is shortened, and the cost is reduced.

Description

technical field [0001] The invention relates to a vapor return and liquid return protection device. Background technique [0002] At present, in the refrigeration system of refrigerated vacuum dryers produced by domestic and foreign manufacturers, when the return air end is low temperature, in order to prevent the compressor from liquid shock, a vapor-liquid separator device is added to the return air pipeline of the compressor; , only through the compressor electromagnetic valve pulse mode, the refrigeration system is operated; this structure of the refrigeration return steam system has several major disadvantages: 1. Although there is a vapor-liquid separator device, the refrigeration oil cannot be vaporized, so the compressor cannot be completely avoided. 2. Because of the increased buffer, it is more difficult to identify the opening size of the expansion valve, which is not intuitive, and increases the hidden danger of hydraulic shock of the press; 3. Increases the cost...

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Problems solved by technology

[0002] At present, in the refrigeration system of refrigerated vacuum dryers produced by domestic and foreign manufacturers, when the return air end is low temperature, in order to prevent the compressor from liquid hammering, a vapor-liquid separator device is added to the return air pipeline of the compressor; , only through the compressor solenoid valve pulse mode, the refrigeration system is operated; this structure of the refrigeration return steam system has several major disadvantages: 1. Although there is a vapor-liquid separator device, the refrigeration oil cannot be vaporized, so the compressor cannot be completely avoided. 2. Because of the increased buffer, it is more difficult to identify the opening size of the expansion valve, which is not intuitive, and increases the hidden danger of hydraulic shock of the press; 3. Increases the cost of the vapor-liquid device; 4. Freezing In the SIP sterilization and cooling stage of the drying machine, the temperature of the pipeline is high, and the compressor needs to be refrigerated by means of electromagnetic valve pulses, and the cooling cycle is long; Abnormal sound, the press is easily damaged

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