Использование Задержка задания Класс Sencha Touch:
//create the delayed task instance with our callback
var task = Ext.create('Ext.util.DelayedTask', function() {
//load the list's store here. The list will be automatically updated
listComp.getStore().load(); // Assuming your list component is "listComp"
listComp.refresh();
// The task will be called after each 10000 ms
task.delay(10000);
}, this);
//The function will start after 0 milliseconds
//so we want to start instantly at first
task.delay(0);
//to stop the task, just call the cancel method
//task.cancel();
Это должно работать для вашего случая.