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Erro mysqli_query() expects parameter 1 to be mysqli, null given in


Estou há dias tentando entender o motivo do erro "mysqli_query() expects parameter 1 to be mysqli, null given in" no meu projeto.

Classe utilizada (arquivo conexao.php):

class Funcoes {
    public $servidor = 'localhost';
    public $usuario = 'meu_user';
    public $senha = 'minha_senha';    
    public $bd = 'meu_bd';    
    public function cnx()
        $link = mysqli_connect($this->servidor, $this->usuario, $this->senha, $this->bd);    
        return $link;                


Arquivo com o erro:

    include ($_SERVER['DOCUMENT_ROOT']."/_pg/conexao.php"); 
     $obj = new Funcoes();
     $link = $obj->cnx();           
    function abreLink($descricao) {
        $query = mysqli_query($link, "SELECT * FROM links WHERE descricao='$descricao'");    
        while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) {
            $url = $row['link'];        
        return $url;


Alguém poderia dar uma luz?!

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