Fluid circulation pump for heating and conditioning systems and the like

Abstract

The present invention relates to a method for measuring a parameter characteristic of a heating and/or conditioning system ( 1 ) equipped with a primary hydraulic circuit ( 6 ) and a secondary hydraulic circuit ( 9 ) and wherein at least one operative fluid circulation pump ( 2 ) is provided operated by an electric motor and driven by a control electronic device ( 10 ). The method provides: a starting measure of the flow rate of the circulating operative fluid carried out with closed delivery, immediately downstream the pump; a subsequent measure of the flow rate of the circulating operative fluid in the sole secondary hydraulic circuit ( 9 ); the first and the second measure being carried out with means associated to the control device ( 10 ) of the pump ( 2 ) so as to output an electric signal correlated with the percentage of additive of the circulating operative fluid or with a variation of the calorific power of the system.

1 . Fluid circulation pump ( 2 ), in particular for a heating and/or conditioning system ( 1 ) equipped with a primary hydraulic circuit ( 6 ) and with a secondary hydraulic circuit ( 9 ) and wherein the pump is operated by a synchronous electric motor ( 12 ) and driven by a control electronic device ( 10 ), characterised in that said device ( 10 ) comprises a processing unit ( 22 ) receiving at its input a first signal ( 24 ) coming from a magnetic flux sensor ( 20 ) of the rotor ( 14 ) and a second network synchronism signal ( 24 ) and being equipped with or associated to a memory portion wherein experimental data are stored of correlation between the hydraulic flow rate (Q) values and an operation variable of the pump's motor; so as to produce a signal output correlated with the percentage of additive of the circulating operative fluid.  
   
   
       2 . Pump according to  claim 1 , characterised in that said variable is the load angle θ and that said sensor ( 20 ) is a digital Hall sensor.  
   
   
       3 . Pump according to  claim 1 , characterised in that said variable is the load angle θ and that said sensor ( 20 A) is an analog Hall sensor.  
   
   
       4 . Method for measuring a parameter characteristic of a heating and/or conditioning system ( 1 ) equipped with a primary hydraulic circuit ( 6 ) and with a secondary hydraulic circuit ( 9 ) and wherein at least one operative fluid circulation pump ( 2 ) operated by an electric motor and driven by a control electronic device ( 10 ) is provided, characterised in that it provides: 
 a starting measure of the flow rate of the circulating operative fluid carried out with closed delivery, immediately downstream the pump;    a subsequent measure of the flow rate of the circulating operative fluid in the sole secondary hydraulic circuit ( 9 );    said first and second measure being carried out with means associated to the control device ( 10 ) of the pump ( 2 ) so as to output an electric signal correlated with the percentage of additive of the circulating operative fluid or with a variation of the calorific power of the system.    
   
   
       5 . Method according to  claim 4 , characterised in that the pump ( 2 ) is operated by a synchronous electric motor ( 12 ) with a permanent magnet rotor ( 14 ) and in that said first and second measure are carried out through the following steps of: 
 acquisition of at least one operation variable of the pump;    comparison between the value of said variable and a predetermined table of correlation with hydraulic flow rate values and determination of a corresponding flow rate value.    
   
   
       6 . Method according to  claim 5 , characterised in that said at least one operation variable of the pump is a load angle or delay θ, i.e. a phase shift angle between the network voltage applied at the ends of the motor ( 12 ) and counter electromotive force caused by the sum of the effects of the stator flux and of the flux induced by the rotation of the rotor ( 14 ) permanent magnet.  
   
   
       7 . Method according to  claim 6 , characterised in that it provides the acquisition of a further operation variable of the pump such as the temperature of the rotor magnet.  
   
   
       8 . Method according to  claim 7 , characterised in that it provides the detection of a signal proportional to the residual induction (B R ) of the ferromagnetic material of the rotor ( 14 ) and dependent on the operation temperature, by means of a Hall sensor ( 20 A) of the analog type.  
   
   
       9 . Method according to  claim 5 , characterised in that said at least one operation variable of the pump is a load angle, or delay θ, detected by means of a digital Hall sensor ( 20 ).  
   
   
       10 . Method according to  claim 5 , characterised in that said at least one operation variable of the pump is a load angle, or delay θ, detected by means of an analog Hall sensor ( 20 A).  
   
   
       11 . Heating and/or conditioning system equipped with a primary hydraulic circuit ( 6 ) and with a secondary hydraulic circuit ( 9 ) and characterised in that it comprises at least one fluid circulation pump according to  claim 1.