Oil return control method during high-temperature refrigeration of direct current variable frequency multi-unit machine

A high-temperature refrigeration and oil return control technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as burning out compressors, failure to return oil, and system damage, achieving high reliability and ensuring reliability Sexuality, the effect of prolonging the oil return operation time

Active Publication Date: 2012-01-25
NINGBO AUX ELECTRIC
View PDF7 Cites 39 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the frequency reduction protection of the system during high-temperature cooling, the compressor cannot run at high frequency at the oil return frequency Fx, which makes the oil return effect ineffective, resulting in burnout of the compressor. The frequency reduction protection of the system is shielded to ensure oil return, which may cause damage to the entire system

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The present invention will be described in further detail below in combination with specific embodiments.

[0012] The present invention provides a method for controlling oil return during DC frequency conversion multi-line high-temperature refrigeration, which includes the following steps:

[0013] (1) Parameter initialization: the system defines the oil return frequency Fx, the oil return interval Tb, the oil return operation time Ty, and the current operation frequency Fb; the oil return frequency Fx and the oil return operation time Ty are based on the specific multi-line system Determined through experiments or provided by the compressor manufacturer. In this embodiment, the oil return frequency Fx is 72 Hz, the oil return operation time Ty=3 minutes, and the oil return interval is the interval between each oil return. In this embodiment, Tb=3 hours.

[0014] (2) Judging whether the system needs oil return: when the system operation distance from the last oil retu...

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 provides an oil return control method during high-temperature refrigeration of a direct current variable frequency multi-unit machine. The method comprises the following steps of: (1) initializing parameters; (2) when a system operates for the time which is greater than or equal to Tb from previous oil return, and Fb is less than or equal to Fx, making that Fb is equal to Fx and operation time T is equal to Ty; and if frequency reduction protection is not available in the operation time T of the system, finishing the oil return; (3) if the frequency reduction protection is available in the system, recording the time Tf for the system to operate at the current frequency and calculating unfinished time T-Tf; (4) making that Fb is equal to Fb-f and operation time T is equal to 2(T-Tf); then if the frequency reduction protection is not available during operation time T of the system, finishing the oil return, and if the frequency reduction protection is available in the system, returning to the step (3) until the current operation frequency Fb is reduced to the minimum frequency Fmin for the operation of the compressor. By adopting the oil return control method, the compressor is not burnt down, the system is not damaged, and high reliability is guaranteed.

Description

technical field [0001] The invention relates to the technical field of DC frequency conversion multi-connection air-conditioning systems, in particular to an oil return control method for DC frequency conversion multi-connection high-temperature refrigeration. Background technique [0002] When the current DC frequency conversion multi-connected air conditioning system is used for high-temperature refrigeration (generally refers to the ambient temperature above 40°, such as Africa), due to the high system pressure, high compressor exhaust temperature and large current, in order to ensure the normal operation of the system, DC frequency conversion The multi-connected air conditioning system has frequency reduction protection for excessive exhaust temperature, frequency reduction protection for current overcurrent, and frequency reduction protection for excessive temperature in the middle of the condenser to ensure the normal operation of the system. This makes the entire syst...

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
Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02F24F11/00
Inventor 郑坚江程德威余坚强杜鹏
Owner NINGBO AUX ELECTRIC
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