EP 0227504 A1 19870701 - Method of protecting a refrigeration plant against deposits of additives in the refrigerant circuit.
Title (en)
Method of protecting a refrigeration plant against deposits of additives in the refrigerant circuit.
Title (de)
Verfahren zum Schützen einer Kälteanlage vor dem Niederschlag von Zusatzstoffen in dem Kältemittelkreislauf.
Title (fr)
Procédé de protection d'une installation frigorifique contre les dépÔts d'additifs dans le circuit du fluide caloporteur.
Publication
Application
Priority
FR 8516355 A 19851105
Abstract (en)
1. A method for monitoring and protecting a refrigeration plant, in particular against deposits of additives present in the refrigerant fluid, of the type formed by a heat-insulating chamber equipped with an access door and refrigerated by the evaporator of a single or double circuit for the circulation of refrigerant fluid(s), the refrigeration plant comprising a sensor of the temperature (theta 2) of the heat-insulating chamber, a sensor (45) of the opening of the access door, these sensors being connected to a unit (40) for processing the data supplied by the said sensors, the said unit being in its turn connected to means for alarm and protection (48, 49, 50), the method being characterised in that : - the temperature (theta 1) of the refrigerant circuit is sensed at regular intervals and memorised ; - this information is compared in the course of time in order to calculate the direction of drift of the temperature ; - the alarm and protection means (48, 49, 50) are actuated when the temperature drift (theta 1) of the refrigerant circuit is positive and when the temperature (theta 2) of the heat-insulating chamber is outside a prescribed range.
Abstract (fr)
Le domaine de l'invention est celui des installations frigorifiques, notamment à très basse température. Le problème posé consiste à détecter de la manière la plus précoce possible, les pannes susceptibles de se produire dans ce type d'installation, notamment en cas de figement de l'huile des compresseurs, ou de tout autre anomalie de l'installation. Cet objectif est atteint au moyen d'un système de capteurs de température (ϑ1 ϑ2), et de contacts (45) connectés à une unité de traitement commandant des moyens d'alarme et/ou de protection (48,49,50). L'invention trouve une application préférentielle pour les installations frigorifiques à circuits en cascades ou à cycles à démixion et peuvent être avantageusement associés à un dispositif de régulation de la température de l'installation.
IPC 1-7
IPC 8 full level
F25B 7/00 (2006.01); F25B 49/00 (2006.01)
CPC (source: EP)
F25B 7/00 (2013.01); F25B 49/005 (2013.01)
Citation (search report)
- [Y] DE 2630111 A1 19780112 - LICENTIA GMBH
- [Y] US 4283921 A 19810818 - PROSKY HOWARD S
- [A] FR 2466711 A1 19810410 - BORG WARNER [US]
- [A] WO 8503995 A1 19850912 - TRW INC [US]
- [A] US 4325223 A 19820420 - CANTLEY ROBERT J
- [A] US 4387578 A 19830614 - PADDOCK STEPHEN W
- [A] US 3707851 A 19730102 - MCASHAN R
- [A] FR 2296829 A1 19760730 - VIGNAL MAURICE [FR]
- [A] FR 2339919 A1 19770826 - GAUVENET FRANCOIS [FR]
- [A] US 3381488 A 19680507 - LEWIS DWIGHT C
- [AP] FR 2574916 A1 19860620 - CHEVAILLIER ERIC [FR]
- [A] FR 2024067 A5 19700821 - MAY ET ROBERTSON LTD
- [A] EP 0064873 A2 19821117 - R D TECHNOLOGY LIMITED [GB]
- [A] FR 2533678 A1 19840330 - THOMSON CSF [FR]
Designated contracting state (EPC)
BE CH DE GB IT LI
DOCDB simple family (publication)
FR 2589561 A1 19870507; FR 2589561 B1 19880610; DE 3665767 D1 19891026; EP 0227504 A1 19870701; EP 0227504 B1 19890920
DOCDB simple family (application)
FR 8516355 A 19851105; DE 3665767 T 19861031; EP 86402443 A 19861031