Grasso SC Typo P, R, S, T, V, W, Y Volumen nominal de aspiración 805 … 2 390 m³/h Manual del Usuario
12/04
_510105_um_sc_py_esp_.doc
1
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Copyright
Reservados todos los derechos. Ninguna parte de esta publicación puede ser reproducida o editada por ningún medio, sea éste impresión, fotocopia, microfilm o cualquier otro sin previa autorización escrita de Grasso. Esta restricción también es válida para los dibujos y esquemas correspondientes. Aviso legal
Esta publicación ha sido redactada de buena fe. Sin embargo Grasso no se responsabilizará de los errores que puedan existir en esta publicación ni de sus consecuencias.
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1
INSTRUCCIONES
2
CONCEPTO GENERAL
AI_LT_02_esp
3
CONSTRUCCION
AI_LT_03_esp
4
CONEXIONES
5
OPERACION
Y
6
LISTADO
HERRAMIENTAS
DE
DE
Y
SEGURIDAD
FUNCIONAMIENTO
510090(ATEX)esp
AI_PY_04_esp
MANTENIMIENTO
AI_LT_05_esp
AI_P_06_esp AI_RST_06_esp AI_VWY_06_esp
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Grasso
INDICACIONES GENERALES DE SEGURIDAD COMPRESORES HELICOIDALES
Refrigeration Division
INSTRUCCIONES DE SEGURIDAD Todas las operaciones descritas en estas instrucciones de operación, deberán ser realizadas por personal debidamente cualificado y formado.
Las siguientes normas se deben cumplir estrictamente: Para la instalación de máquinas de refrigeración y • la protección del personal EN 378-3 y prEN 12693, sección 4.1 • Para comprobar la máquina de refrigeración antes de su arranque, EN 378-2, sección 9.5 Para realizar las posteriores pruebas • EN 378-2, apéndice C Para realizar las pruebas de corrosión • EN 378-2, apéndice D • Para realizar el registro de una planta EN 378-2, sección 11.5 y EN 378-4, sección 6.6 Para tomar medidas en caso de emergencia • EN 378-2, sección 11.2.3 Para instruir al personal operativo competente • EN 378-4, sección 4.1 • Para mantenimiento y reparación EN 378-4, sección 5 Para recuperar, volver a usar o retirar los • refrigerantes, aceites, refrigerantes secundarios y componentes de la máquina de refrigeración (por ej. filtros, secadores, aislamiento térmico) EN 378-4, sección 6 Para el drenaje de aceite en las máquinas de • refrigeración con amoniaco, EN 378-4, apéndice A • Para el tratamiento y almacenamiento de refrigerantes, EN 378-4, apéndice C Para el uso específico de los compresores helicoidales en áreas con riesgo de
•
•
•
•
Una limpieza estricta durante el montaje facilita una operación posterior sin averías. Al finalizar los trabajos de mantenimiento y reparación los componentes en cuestión se limpiarán usando productos orgánicos para eliminar grasas y se engrasarán usando un aceite frío adecuado. Al término de los trabajos el compresor será evacuado, después de lo cual se llevarán a cabo las pruebas de presión y de vacío. Indicaciones para tiempos de detención más lar gos: Si la unidad permanece parada durante un espacio de tiempo más largo (más de una semana), se recomienda lo siguiente: →
→
•
•
•
Cerrar las válvulas de cierre de la unidad compresora de tornillo en las líneas de aspiración y descarga. Girar cada 4 semanas un octavo de vuelta el eje del compresor desde la posición del acoplamiento.
Si el compresor ha permanecido parado y separado por largo tiempo, se deberá llenar primero con nitrógeno seco después de la evacuación (0,5 bar de sobrepresión). En el capítulo „Operación y Mantenimiento“ del Manual se describe el trabajo de mantenimiento y reparación de todos los componentes del compresor de tornillo accesibles desde el exterior. Debido a que sólo se desmontan componentes individuales, el compresor de tornillo puede permanecer conectado a la unidad durante las operaciones de mantenimiento y reparación descritas aquí. Para desmontar totalmente el compresor para su reparación, se necesitan unos requisitos técnicos especiales, razón por la cual no se describen en este documento.
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CONCEPTO GENERAL
Grasso Refrigeration Division
CONCEPTO GENERAL COMPRESORES HELICOIDALES SERIE DE CONSTRUCCION LT, TYPOS P, R, S, T, V, W, Y, Z, XA, XB, XC, XD, XE, XF •
Introducción
•
Compresión
•
Sistema hidráulico
•
Regulación de rendimiento
•
Posicionamiento Vi
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CONCEPTO GENERAL Grasso Refrigeration Division
INTRODUCCION
Los compresores helicoidales aquí descritos son máquinas de pistón giratorio de doble efecto. Ellos trabaj trabajan an según según el el prin princip cipio io de despla desplazam zamien iento to positi positivo, vo, operando con inyección de aceite y están previstos para diferentes tipos de medios de enfriamiento. Los dos rotores poseen un pronunciado dentado helicoidal con perfil asimétrico, ellos ruedan con un mínimo juego el uno con el otro y se encuentran encerrados en un cárter. El rotor primario, que dispone de 5 o 4 dientes accionados por el motor, se encarga a su vez de accionar el rotor secundario de 6 dientes . Cojinetes de fricción reciben las fuerzas radiales y rodamientos de bolas de contacto angular las fuerzas axiales. Un pistón de equilibrado, dispuesto en el eje del rotor principal, aliviana a los rodamientos de bolas de contacto angular. Una empaquetadura anular plana obtura el eje de tracción actuando como corte de aceite y alivianadora de fuerzas. Los compresores presentan un sistema de compuertas en tándem tándem (Sistem (Sistema a TS) TS) para para el cont control rol de carga carga parcia parciall Vi Vi combinado en servicio a plena carga y a carga parcial. Las dos compuertas, primaria y secundaria, que se encuentran una detrás de otra, pueden llegar a ser desplazadas en forma contínua a la posición Vi óptima para el proceso de compresión. Al mismo tiempo se alcanza con este desplazamiento un cambio en el caudal de aceite, con lo cual se regula la potencia.
Las compuertas se posicionan hidráulicamente mediante el aceite que también alimenta al compresor. La indicación de la posición de la compuerta primaria se logra a través través del sensor sensor de desp desplaz lazami amiento ento hermet hermetizad izado. o. Para poder introducir un mayor flujo de volumen (por ej. para la conexión del economizador), el compresor dispone de una o dos compuertas de aspiración adicionales. Para la inyección de medios de enfriamiento líquidos está dispuesta una conexión hacia la cámara de trabaj trabajo, o, con esto es posi posible ble un enfriam enfriamien iento to adic adicion ional al del del proceso de compresión. Una conexión en el cárter de descarga presenta una cañería de unión proveniente del colector de aceite para evitar las fluctuaciones de presión en el rango inferior de carga parcial durante altas condiciones de presión de operación. Las construcciones sencillas de los compresores están equipados con relación de volumen Vi fija y se encuen tran tran a dispos disposici ición ón con los siguie siguientes ntes valore valoress Vi: Vi: 2,6; 2,6; 3,6; 4,8 ó 5,5. A parte de eso existen a modo de variantes especiales, un compresor para operar con bajas diferencias de presión (tipo Booster) y un compresor para cargas más altas de presión (equipo de bomba de calor).
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CONCEPTO GENERAL Grasso Refrigeration Division
COMPRESION
Durante el giro de los rotores se empuja mediante el engranamiento de los dientes desde el lado de aspiración hacia el lado de descarga. Entre cada dos dientes del rotor principal y secundario se forma un espacio entre dientes con forma de V, el que se va incrementando hasta un máximo (proceso de aspiración: Figura 2, 1-3, vista de la parte superior de los rotores). Con el siguiente giro se cierra a través de un nuevo engranamiento de dientes en el lado de aspiración el espacio entre dientes con forma de V. Finalmente se irá disminuyendo a través del avance contínuo del engranamiento de los dientes (proceso de compresión: Figura 2; 4-5, vista de la parte inferior de los rotores). El proceso de compresión se terminará en cuanto el espacio entre dientes haya alcanzado el comienzo de los cantos direccionales en el cárter y de la compuerta de regulación o bien la compuerta Vi (Figura 2, 6). Los cantos direccionales pertenecen a la abertura de salida, la que presenta una partición axial y una radial. La disposición de los cantos direccionales determina el tamaño del del volumen a comprimir comprimir y con ello ello el grado grado de compresión. El volumen comprimido junto al siguiente giro de los rotores será, desde el espacio entre dientes disminuido a cero, lanzado hacia la cámara de descarga del compresor. Este ciclo de trabajo descrito descrito se repetirá repetirá en cada cada siguiente siguiente espacio espacio
Lado de aspiración
Lado de descarga
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CONCEPTO GENERAL Grasso Refrigeration Division
SISTEMA HIDRAULICO
REGULACION DE RENDIMIENTO
El aceite ingresado al compresor debe realizar las siguientes funciones:
La regulación de rendimiento está basada en una regulación de volumen. Ella trabaja según el principio de la reducción geométrica de carrera. Esta se alcanza, en compresores con Vi variable, mediante dos compuertas (las compuertas primaria y secundaria), las que forman parte de las paredes del cárter. A través de su posicionamiento se produce una abertura que comunica a la entrada de la cámara de trabajo (desvío interior).
1. Inyección de aceite en la cámara de trabajo; 2. Obturación y enfriamiento de la empaquetadura anular plana; 3. Lubricación de los rodamientos radial y axial; 4. Carga del pistón de equilibrado; 5. Accionamiento de la regulación de rendimiento y del posicionamiento Vi. El aceite inyectado en la cámara de trabajo del compresor (según punto 1) tiene las siguientes tareas: −
−
−
−
Absorción y evacuación del calor de compresión; Lubricación de los flancos de dientes engranados del rotor principal y secundario; Obturación de las ranuras entre los flancos de dientes y las ranuras radiales y axiales entre los rotores y cárter; Disminución de la emisión acústica.
El caudal completo de aceite ingresado al compresor es dirigido junto al medio de enfriamiento comprimido a través del tubo de descarga de la máquina hacia un colector de aceite, en el cual se logra la separación de aceite y medio de enfriamiento.
El volumen de flujo del compresor se varía mediante la regulación de rendimiento de 100 % hasta casi 10 % en forma contínua. En el rango de carga parcial superior, la regulación del rendimiento de los compresores con Vi variable se logra desplazando la compuerta secundaria y manteniendo la compuerta primaria en una posición fija. En los rangos medio e inferior de carga parcial, la regulación de rendimiento se logra a través de la compuerta primaria. La compuerta primaria garantiza en su posición mínima una puesta en marcha suave del compresor, en donde sólo se logra un mínimo trabajo de compresión. El posicionamiento de la compuerta se efectúa mediante un dispositivo hidráulico unido a ella, y la existente diferencia de presión de operación del compresor sobre la compuerta primaria. Un sensor de
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CONCEPTO GENERAL Grasso Refrigeration Division
POSICIONAMIENTO Vi
La relación de volumen interno Vi es un valor especial del compresor helicoidal y se calcula como la cantidad relacionada de los volúmenes de los espacios de la compresión hasta el fin de la misma. El fin de la compresión se determina mediante la disposición de los cantos direccionales en la abertura de salida radial, estos cantos son parte componente de la compuerta primaria. Distintos ajustes de Vi se alcanzan si la compuerta primaria varía su posición axialmente. La relación de volumen Vi se ajusta según las condiciones de operación externa (presión de aspiración, presión final), de modo que la presión en el espacio entre dientes al alcanzar la abertura de salida presente apróximadamente el valor de la presión final. Así será el proceso de compresión bajo en pérdidas y la correspondiente fuerza de impulsión necesaria será la más baja. El posicionamiento de la compuerta primaria en su posición Vi óptima se logra mediante un mando programable del compresor.
Alimentación
en valor Vi óptimo
Rotor
Descarga Posición a plena carga
Posición Vi óptimo
Compuerta secundaria
Compuerta primaria
Regulación de la compuerta secundaria Alimentación en valor Vi óptimo
En la posición de plena carga se desplaza la compuerta secundaria conjuntamente a la compuerta primaria durante la variación de Vi.
Rotor Posición a operación en carga parcial
Descarga Posición Vi óptimo Desvío interno
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Grasso Refrigeration Division
CONSTRUCCION Y FUNCIONAMIENTO COMPRESORES HELICOIDALES SERIE DE CONSTRUCCION LT, TIPOS P, R, S, T, V, W, Y, Z, XA, XB, XC, XD, XE, XF •
Cárter
•
Rotores Cojinetes Empaquetadura anular plana Regulación de rendimiento Posicionamiento Vi
•
Sistema de indicación del sensor de desplazamiento
• • • •
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Grasso Refrigeration Division
Para una mejor comprensión de las siguientes descripciones, se podrán consultar el índice de ilustraciones y el listado de piezas. CÁRTER El cárter está confeccionado en tres partes de fundición gris. Está compuesto de un cárter de aspiración, un cárter de rotor y un cárter de descarga; todos con con junturas junturas verticales. La brida de de conexión del lado de aspiración está dispuesta horizontalmente y la del lado de descarga en forma vertical. La obturación entre las partes del cárter, así como la tapa y la brida dispuesta en el cárter, se logra mediante anillos de goma. Para el vaciado del aceite existen tornillos de cierre a disposición. La pared frontal a la cámara de trabajo en el lado de aspiración dispone de bridas de cierre o filos del cárter con superficies de guiado para la compuerta
COJINETES A través de la compresión actúan sobre los rotores tanto fuerzas fuerzas radiales radiales como axiales, axiales, las cuales cuales son absorbidas por los correspondientes elementos de rodamiento. Las fuerzas radiales son absorbidas por cojinetes de fricción hidrodinámicos, los que poseen un cuerpo de apoyo de acero y una capa de rodadura de metal blanco. Rodamientos de bolas de contacto angular, los que están dispuesto de a pares, permiten la absorción de las fuerzas axiales así como la precisa guiación y fijación axial de los rotores. Teniendo en cuenta las condiciones de espacio disponibles, varios tamaños de compresor están equipados con diferentes rodamientos de bolas de contacto angular tanto en los lados de rotor macho, como del hembra. Los rodamientos de bolas de contacto angular están equipados de una celda sólida para especiales requerimientos en el compresor helicoidal.
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Grasso Refrigeration Division
REGULACION DE RENDIMIENTO
POSICIONAMIENTO Vi
Las compuertas primaria y secundaria de la regulación de rendimiento forman parte de las paredes inferiores de la cámara de trabajo. En el posicionamiento de las compuertas se produce una abertura de desvío, la que mediante los canales en el cárter tiene conexión a las cámaras de aspiración del compresor. La compuerta primaria es desplazable axialmente desde la posición plena carga en dirección al cárter de descarga, y está unida en el lado de aspiración mediante un vástago de pistón con un pistón hidráulico, que puede llegar a ser empujado en ambos sentidos. El pistón se mueve dentro de un cilindro cerrado a ambos extremos. Los espacios existentes dentro del cilindro del pistón hidráulico se llenan y purgan a partir de válvulas solenoide, bien embridadas directamente sobre el compresor, o bien colocadas todavía en el exterior de distintos distintos tamaños. tamaños.
El valor Vi es determinado a través de la posición de la compuerta primaria. En la operación del compresor a plena carga se encuentra la compuerta secundaria acoplada a la compuerta primaria mediante su pistón hidráulico empujado por la presión de aceite. Durante el posicionamiento de la compuerta primaria en la dirección del lado de descarga (aumento de Vi) se desplaza la compuerta secundaria también y se mantiene en contacto con la compuerta primaria. En el posicionamiento de la compuerta primaria en la dirección del lado de aspiración (disminución de Vi) se desplaza conjuntamente la compuerta secundaria mediante el desplazamiento de la compuerta primaria.
En el rango superior de carga parcial, la regulación de
El control del compresor permite en forma alternativa una especificación libre del valor Vi (colocación manual). En la confección sencilla del compresor con relación de volumen Vi fija, se encuentra la compuerta secundaria
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Grasso Refrigeration Division
SISTEMA DE INDICACION DEL SENSOR DE DESPLAZAMIENTO 1. Corredera primaria/ Corredera de control Tipos P, R, S, T, V, W, Y, Z, XA El posicionamiento de la compuerta primaria/ corredera de control se registra mediante el sistema de indicación del sensor de desplazamiento TDH
2. Corredera secundaria En una versión especial, los compresores se pueden dotar de un sistema indicador para la corredera secundaria. La posición de la corredera secundaria se registra mediante un segundo sensor de posición en la base del transformador diferencial hermético (TDH) ubicado en la pared del cárter del rotor; para los tipos
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CONEXIONES
Grasso Refrigeration Division
CONEXIONES COMPRESORES HELICOIDALES SERIE DE CONSTRUCCION LT, TIPOS P, R, S, T, V, W, Y •
Conexiones de tubos/Roscas
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CONEXIONES Grasso Refrigeration Division
CONEXIONES DE TUBOS/ROSCAS Item
Descripción P
Diámetro nominal/ rosca R, S, T
V, W, Y
S
Tubo de aspiración
DN 150
DN 175
DN 250
T
Tubo de descarga
DN 100
DN 100
DN 150
A
Alimentación de aceite a la empa-
M22x1,5
M22x1,5
M22x1,5
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CONEXIONES Grasso Refrigeration Division
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CONEXIONES Grasso Refrigeration Division
CONEXIONES EXTERIORES TIPO P
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CONEXIONES Grasso Refrigeration Division
CONEXIONES EXTERIORES TIPOS R, S, T
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CONEXIONES Grasso Refrigeration Division
CONEXIONES EXTERIORES TIPOS V, Y
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