Electromagnetic pump with oscillating core

Abstract

Electromagnetic pump with oscillating core, connected to a hydraulic device, to transfer a fluid into the hydraulic device. The pump includes a containing body, a tubular element of amagnetic material, a core of ferromagnetic material sliding coaxially to the tubular element, an electromagnetic unit arranged around the core and coaxial to the tubular element to generate an alternating magnetic field and cause the core to slide axially and alternately with respect to the tubular element. The tubular element includes, in one piece, a first part, projecting outside both the containing body and the electromagnetic unit and having an attachment configured to be selectively associated, directly or indirectly, with mating attachment elements of the hydraulic device, and a second part disposed inside both the containing body and the electromagnetic unit and having an axial cavity in which the core slides. The tubular element further includes, in one piece, a flange between the first part and the second part and configured to allow the direct mounting of the tubular element to the containing body and the electromagnetic unit.

1 . Electromagnetic pump with oscillating core able to be connected to a hydraulic device to transfer a fluid at a determinate pressure into said hydraulic device, comprising: 
 a containing body,    a tubular element made of amagnetic material,    a core made of ferromagnetic material able to slide coaxially to said tubular element,    an electromagnetic unit arranged around said core and coaxial to said tubular element to generate an alternating magnetic field and cause said core to slide axially and alternately with respect to said tubular element,    wherein said tubular element comprises, in one piece, a first part, protruding outside both said containing body and said electromagnetic unit and provided with attachment means configured to be selectively associated, directly or indirectly, with mating attachment elements of said hydraulic device, and a second part disposed inside both said containing body and said electromagnetic unit and having an axial cavity in which said core is able to slide, said tubular element further comprising, in one piece, a flange intermediate between the first part and the second part and configured to allow the direct mounting of the tubular element to the containing body and to the electromagnetic unit.    
   
   
       2 . Electromagnetic pump as in  claim 1 , wherein said attachment means of said first part comprise a cylindrical, smooth and non-threaded segment on a rear part of which a groove is provided for the fast snap attachment to mating means of the hydraulic devices.  
   
   
       3 . Electromagnetic pump as in  claim 2 , wherein an adaptor element, configured so as to be coupled with said attachment elements of said hydraulic device, is able to be coupled with said smooth segment and with the groove of said first part of said tubular element.  
   
   
       4 . Electromagnetic pump as in  claim 3 , wherein said connector comprises an internal profile for its coupling with the external profile of said smooth segment and with the groove of said first part of said tubular element, and an external profile by means of which it is able to be fast coupled with said hydraulic device.  
   
   
       5 . Electromagnetic pump as in  claim 3 , wherein selectively removable clamping means are provided to maintain said connector associated with said first part of said tubular element.  
   
   
       6 . Electromagnetic pump as in  claim 5 , wherein said clamping means comprise an elastic element able to cooperate with said groove, said groove being a circumferential groove.  
   
   
       7 . Electromagnetic pump as in  claim 5 , wherein said clamping means comprise a bayonet joint.  
   
   
       8 . Electromagnetic pump as in  claim 1 , wherein said electromagnetic unit comprises an electric coil arranged around said second part of said tubular element, a ferromagnetic structure arranged around said electric coil and an external insulating layer.  
   
   
       9 . Electromagnetic pump as in  claim 1 , wherein said electromagnetic unit is constantly held against said first circular flange by a rear closing ring-nut, coupled with said second part of said tubular element.  
   
   
       10 . Electromagnetic pump as in  claim 9 , wherein said rear ring-nut comprises a substantially tubular part coaxial to said tubular element, and a second circular flange substantially parallel to said first circular flange.  
   
   
       11 . Electromagnetic pump as in  claim 10 , wherein said tubular part of said rear ring-nut is provided with a through hole and with an external surface connecting it with an external element, to allow the entrance of said fluid inside said tubular element.  
   
   
       12 . Electromagnetic pump as in  claim 11 , wherein said tubular part also has an internal thread made in a zone close to said second circular flange, able to allow said rear ring-nut to be screwed to said second part of said tubular element.  
   
   
       13 . Electromagnetic pump as in  claim 12 , wherein an elastic element is arranged inside said second part of said tubular element between said ring-nut and said core to constantly thrust said core towards said first part of said tubular element.  
   
   
       14 . Electromagnetic pump as in  claim 1 , wherein at least a shutter is housed inside said first part of said tubular element, constantly thrust towards said core by a spring arranged between said shutter and an internal shoulder made in one piece on said first part of said tubular element.  
   
   
       15 . Electromagnetic pump as in  claim 1 , wherein said tubular element is internally divided into two coaxial cylindrical cavities, respectively a first high-pressure cavity, substantially made in correspondence with said first part, and a second low-pressure cavity, substantially made in correspondence with said second part and inside which said ferromagnetic core is able to slide.  
   
   
       16 . Electromagnetic pump as in  claim 15 , wherein a bushing is inserted into said tubular element to separate said two coaxial cavities.  
   
   
       17 . Electromagnetic pump as in  claim 16 , wherein a sealing ring and a first elastic ring are interposed between said bushing and said first cavity.  
   
   
       18 . Electromagnetic pump as in  claim 16 , wherein a second elastic ring is interposed between said bushing and said second cavity, with the function of an end-of-travel element for said ferromagnetic core and of absorbing the noise due to the action of said ferromagnetic core itself.  
   
   
       19 . Electromagnetic pump as in  claim 1 , wherein the hydraulic device is selected from the group consisting of a boiler and an electro-valve.