Operation method and system for secondary throttle intermediate incomplete cooling refrigeration system

A secondary throttling and refrigeration system technology, applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of compressor impact, defrosting efficiency reduction, defrosting speed, etc., to improve service life and use Flexible and convenient, high defrosting efficiency

Active Publication Date: 2018-11-06
TIANJIN UNIV OF COMMERCE
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this defrosting method operates a single-stage compression heat pump cycle during defrosting, when the two-stage compression refrigeration cycle is converted to a single-stage compression heat pump defrosting cycle, the working pressure difference of the compressor participating in the defrosting of the single-stage compression heat pump cycle is greatly increased. It will cause impact on the compressor and damage the compressor, and the temperature of the working medium entering the evaporator for this single-stage compression heat pump defrosting cycle is low, the defrosting speed is slow, and the time for heat diffusion around the evaporator

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Operation method and system for secondary throttle intermediate incomplete cooling refrigeration system
  • Operation method and system for secondary throttle intermediate incomplete cooling refrigeration system
  • Operation method and system for secondary throttle intermediate incomplete cooling refrigeration system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The structure schematic diagram of the non-full liquid type of hot gas defrosting in the present invention adopts heat pump defrosting and incomplete cooling in the middle of secondary throttling refrigeration system. figure 2 As shown, it includes a high-pressure stage compressor unit, a condenser 5, a first throttle valve 4-1, an intercooler 3 and multiple low-pressure stage units. In this embodiment, the high-pressure stage compressor unit includes one or more high-pressure stage compressors 1-2. When multiple high-pressure stage compressors are used, the suction port of each high-pressure stage compressor 1-2 Parallel connection is used as the suction end of the high-pressure stage compressor unit, and the exhaust port of each of the high-pressure stage compressors 1-2 is connected in parallel as the exhaust end of the high-pressure stage compressor unit. Each of the low-pressure stage units includes a low-pressure stage compressor 1-1, a first four-way reversing v...

Embodiment 2

[0046] The structural schematic diagram of the flooded type of hot gas defrosting of the present invention adopts heat pump defrosting and incomplete cooling in the middle of secondary throttling refrigeration system. figure 2 As shown, it includes a high-pressure stage compressor unit, a condenser 5, a first throttle valve 4-1, an intercooler 3 and multiple low-pressure stage units. In this embodiment, the high-pressure stage compressor unit includes one or more high-pressure stage compressors 1-2. When multiple high-pressure stage compressors 1-2 are used, each of the high-pressure stage compressors 1-2 The suction port is connected in parallel as the suction end of the high-pressure stage compressor unit, and the exhaust port of each of the high-pressure stage compressors 1-2 is connected in parallel as the exhaust end of the high-pressure stage compressor unit. Each of the low-pressure stage units includes a low-pressure stage compressor 1-1, a first four-way reversing va...

Embodiment 3

[0051] The schematic diagram of the non-full liquid type of high-temperature hot gas defrosting in the present invention adopts the heat pump defrosting and the secondary throttling incomplete cooling refrigeration system in the middle is as follows image 3As shown, it includes a high-pressure stage compressor unit, a condenser 5, a first throttle valve 4-1, an intercooler 3, a two-way valve 8 and multiple low-pressure stage units. In this embodiment, the high-pressure stage compressor unit includes one or more high-pressure stage compressors 1-2. When multiple high-pressure stage compressors are used, the suction port of each high-pressure stage compressor 1-2 Parallel connection is used as the suction end of the high-pressure stage compressor unit, and the exhaust port of each of the high-pressure stage compressors 1-2 is connected in parallel as the exhaust end of the high-pressure stage compressor unit. Each of the low-pressure stage units includes a low-pressure stage co...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an operation method and system for a secondary throttle intermediate incomplete cooling refrigeration system, and aims to provide a method and system for defrosting low-temperature evaporators through a low-pressure-stage compressor heat pump cycle. Each low-pressure-stage unit is provided with a medium-temperature evaporator and the corresponding low-temperature evaporator, the medium-temperature evaporators are used for achieving medium-temperature refrigeration, and the low-temperature evaporators are used for achieving low-temperature refrigeration or defrosting. When the certain low-temperature evaporators need to be defrosted, through valve switching, low-pressure-stage compressors for achieving the defrosting function are converted into high-pressure-stage compressors for operation, low-temperature compressors for achieving the defrosting function in the low-pressure-stage units absorb medium-pressure superheated steam from low-pressure-stage compressorsfor achieving the refrigeration function, and after being compressed, the medium-pressure superheated steam conducts condensation heating on the to-be-defrosted low-temperature evaporators to achievedefrosting. The low-temperature evaporators are defrosted through the low-pressure-stage compressor heat pump cycle, temperature fluctuation is small, the defrosting efficiency is high, and the cooling capacity of a refrigeration room and a freezing room can be provided.

Description

technical field [0001] The present invention relates to the technical field of refrigeration, and more specifically relates to an operation method and refrigeration system of a secondary throttling intermediate incomplete cooling refrigeration system with a medium temperature evaporator and adopting heat pump defrosting. Background technique [0002] In cold storage, when the cooling surface of the heat exchanger is covered by frost, if it is not removed in time, the accumulated frost will reduce the suction temperature of the compressor, increase the exhaust temperature, block the air passage, reduce the heat transfer area, and reduce the air flow rate. The flow resistance increases significantly, the heat transfer efficiency decreases sharply, and the operating performance of the refrigeration device decreases. The quality of the defrosting effect is also the key to give full play to the equipment capacity of the cold storage, reduce the cost of overhaul, save electricity ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F25B1/10F25B41/04F25B47/02F25B49/02F25B41/20
CPCF25B1/10F25B47/02F25B49/02F25B41/40F25B41/20
Inventor 杨永安李瑞申
Owner TIANJIN UNIV OF COMMERCE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap