Variable speed liquid refrigerant pump

F - Mech Eng,Light,Heat,Weapons – 25 – B

Patent

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Details

F25B 49/02 (2006.01) F25B 41/00 (2006.01)

Patent

CA 2235964

The invention entails the use of a positive displacement pump (41) magnetically coupled to a drive motor (42) located in a conduit arrangement (60) which is parallel to the liquid line (22) of the refrigeration system as in Fig. 5. This parallel conduit arrangement (60) also includes a pressure regulating valve (45) that will regulate the amount of pressure added to the liquid line (22) by the parallel pump and piping arrangement (60). In addition, a check valve (47) is located in the liquid line (22) to maintain the pressure differential added to the liquid line. This parallel piping arrangement (60) is desirable in order to allow a constant predetermined pressure to be added to the liquid line regardless of variations in flow rate of the liquid refrigerant. The present invention involves the use of a controlled variable speed drive on the pump meter so the flow rate through the pump will more closely match the variable system flow.

L'invention concerne l'utilisation d'une pompe volumétrique (41) couplée magnétiquement à un moteur d'entraînement (42) situé dans une conduite (60) qui est parallèle à la canalisation de liquide (22) d'un système de réfrigération, tel que celui de la figure 5. Cette conduite parallèle (60) comprend également une valve de régulation de la pression (45) qui va réguler la pression ajoutée à la canalisation de liquide (22) par la pompe et la conduite parallèle (60). En plus, une valve de non-retour (47) se trouve dans la canalisation de liquide (22) pour maintenir le différentiel de pression ajouté à la canalisation de liquide. Cette conduite parallèle (60) est utile pour permettre d'ajouter une pression prédéterminée constante à la canalisation de liquide, indépendamment des variations du débit du liquide réfrigérant. La présente invention concerne l'utilisation d'une commande de vitesse variable placée sur le débitmètre de la pompe, pour que le débit de la pompe corresponde plus étroitement au débit du système, qui est variable.

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