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Bock LR Leistungsregler
Bock LR Capacity regulation
Bock LR Régulation de puissance

09900-03.2014-DGbF

2

Leistungsregelung durch Sauggas- 

 

absperrung 

2.1  Aufbau

Sauggasabsperrung mit pilotgesteuertem Magnet-
ventil. Die Regelung erfolgt stufenweise: die Teilla-
strate hängt ab vom Verhältnis der Zahl der arbei-
tenden Zylinderbänke zur Zahl der abgeschalteten 
Zylinderbänke. Die Bock-Leistungsregelung lässt sich 
auch für den Betrieb mit NH

3

 (R 717) einsetzen.

2.2  Wirkungsprinzip

 

Volllast:  Magnetventil ist stromlos,

 

   

Ansaugkanäle geöffnet (Bild 1) .

 

Teillast:  Magnetventil ist erregt,  

 

   

Ansaugkanäle geschlossen (Bild 2).

Capacity regulation by suction gas  

 

shut-off system 

2.1   Structure

Suction gas shut-off via pilot-controlled solenoid
valve. This controls by steps: the partial load rates 
depend on the ratio between the number of wor-
king cylinder banks to the nummber of shut-down 
cylinder banks. The Bock capacity regulation can 
also be used for operation with NH

3

 (R 717).

2.2  Mode of operation

 

- full load: 

solenoid is dead, suction  

 

 

inlets are open (fig. 1).

 

- partial load: solenoid is actuated, suction  

 

 

inlets are closed (fig. 2).

 Régulation de puissance par arrêt de 
gaz d'aspiration 

2.1  Construction

Arrêt du gaz d' aspiration par vanne solénoide à com-
mande pilote. Cette régulation se fait par étapes : le taux 
de la charge partielle dépend du rapport du nombre des 
cylindres qui fonctionnent et de celui des cylindres hors 
circuit. La régulation de puissance  Bock peut aussi être 
utilisée pour le service avec NH

3

 (R717). 

2.2 

Fonction

-  Pleine charge : la vanne solénoide est sans courant, 

les orifices d'aspiration sont ouverts (fig. 1).

-  Charge partielle : la vanne solénoide est excitée,  

les orifices d' aspiration sont fermés (fig. 2).

LR 84 / 87 / 92

LR 10 / 12

Bild 1, Fig. 1

Bild 2, Fig.2

Summary of Contents for Bock HG8 Series

Page 1: ...ke it necessary and economically rational for the compressor capacity to be adjusted to the current cooling requirements 1 1 Methods of capacity regulation We offer various systems for capacity regulation Their choice depends on the kind of plant and type of compressor concerned Combinations of different system are possible 1 1 1 Mechanical capacity regulation By suction gas shut off system cylind...

Page 2: ...es depend on the ratio between the number of wor king cylinder banks to the nummber of shut down cylinder banks The Bock capacity regulation can also be used for operation with NH3 R 717 2 2 Mode of operation full load solenoid is dead suction inlets are open fig 1 partial load solenoid is actuated suction inlets are closed fig 2 2 Régulation de puissance par arrêt de gaz d aspiration 2 1 Construc...

Page 3: ...r im eingebauten Zustand während des Verdichterbetriebs prüfen 2 4 Control function On account of its structure the control function of the valve can only be tested when correctly installed during compressing operation 2 3 Arrangement 2 3 Disposition 2 4 Remarque Par suite de sa construction la fonction de régu lation de la vanne ne peut être vérifiée qu à l état monté pendant le fonctionnement du...

Page 4: ...t fall below a minimum level in either full load or partial load operation 4 m s in horizonal pipe sections 8 m s in vertical pipes For this reason we recommend that vertical pipes be staggered into two separate sections fig 6 As a result of falling suction gas speed velocity in partial load operation the pipe elbow B is blocked by an accumulation of oil This increases the gas velocity in pipe sec...

Page 5: ...d wesentlich höhere Geschwindigkeiten zu berücksichtigen z B Saugleitung 15 bis 20 m s 5 Steuerungsmethoden tion In plants with extensive pipe systems it is recommended to install an additional oil seperator This reduces the oil circulation period and can have positive effects above all on cold starts with relatively high oil ejection For application with NH3 R 717 much higher speeds have to be co...

Page 6: ...ltage for the magnet coil seulement pour AM et F Lors de votre commande prière de toujours indiquer ce qui suit 1 Type de compresseur 2 Référence de l article 3 La tension requise de la bobine d électro 7 Spare parts 7 Pièces de rechange Verdichtertyp Compressor type Modèle de compresseur LR Typ Capacity regulator type Type de LR Artikel Nr der Nachrüstsätze für Zylinderpaar Abschaltung Retrofitti...

Page 7: ...ight with the compres sor e g pipelines bungs union nuts replaced parts etc When starting up do not start the com pressor in a vacuum Only operate the compressor when the whole system has been filled Surface temperatures of more than 100 C are possible on the pressure side respec tively under 0 C on the suction side depending on the operating conditions 8 1 Retrofitting capacity regulators to com ...

Page 8: ...rium Continuous operation in the control stage is not recommended as the gas velocity in the plant system under certain circum stances does not guarantee sufficient oil return to the compressor with activated capacity regulator We recommend switching to unregulated operation 100 capacity for at least 5 minutes per capacity regulated operating hour An assured oil return can also be realised by a 10...

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