Pump

Abstract

In a pump having a rotor inside a pump chamber which is formed inside a case which is formed of a resin material, and a resin mold compound in which an armature is molded with resin, a metallic cover is provided on a portion of an outer surface of the case inside the pump, wherein the portion has inferior durability compared with the rest of the outer surface.

1 . A pump, comprising:
 a pump chamber formed, for forming therein a pathway for fluid, inside a case formed of a resin material;   at least one intake portion connected to the pump chamber for intaking therein the fluid;   at least one discharge portion connected to the pump chamber for discharging therefrom the fluid;   a rotor located inside the pump chamber and having therein a rotor magnet, wherein the rotor rotates along a predetermined rotary shaft;   an impeller rotating along with the rotor so as to direct the fluid to a predetermined direction;   a stator located opposing to the rotor magnet while having a gap therebetween and located outside of the pump chamber, wherein the stator includes therein an armature which is a generator of a magnetic field; and   a metallic cover affixed, for increasing durability of the case, to a portion of the case to which an internal pressure generated by the fluid inside the pump chamber is applied.   
   
   
       2 . The pump according to  claim 1 , wherein the metallic cover covers over a weld line generated on a surface of the case, and is affixed to the case on one side and the other side of the weld line. 
   
   
       3 . The pump according to  claim 1 , wherein the internal pressure of the fluid inside the pump chamber is greater than approximately 250 KPa. 
   
   
       4 . The pump according to  claim 1 , wherein the metallic cover is affixed to the case by a screw at a portion of the case radially outside of the pump chamber. 
   
   
       5 . The pump according to  claim 1 , wherein:
 the case includes an upper case and a lower case in an axial direction; the lower case is cup shaped for containing therein the rotor; and   the metallic cover is affixed to a top surface in an axial direction of the upper case.   
   
   
       6 . The pump according to  claim 1 , wherein:
 the metallic cover is located on top side and bottom side in an axial direction of the case; and   the case is, due to the metallic cover provided thereto, constrictedly secured in the axial direction.   
   
   
       7 . The pump according to  claim 1 , wherein:
 the stator includes therein a resin mold compound having formed therein an armature molded with the resin material; and   the resin mold compound is located for making contact with an outer surface of the case.   
   
   
       8 . The pump according to  claim 5 , wherein:
 the stator includes therein a resin mold compound having formed therein an armature molded with the resin material; and   the resin mold compound is located for making contact with at least an outer circumferential surface of the cup shape of the lower case.   
   
   
       9 . The pump according to  claim 7 , wherein a resin-mold-compound-side metallic cover is affixed to an outer surface of the resin mold compound so as to cover over the outer surface of the resin mold compound. 
   
   
       10 . The pump according to  claim 9 , wherein the case and the resin mold compound are, due to the metallic cover and the resin mold compound side cover respectively provided thereto, constrictedly secured in the axial direction. 
   
   
       11 . The pump according to  claim 8 , wherein a resin-mold-compound-side metallic cover is affixed to the outer surface of the resin mold compound so as to cover over the outer surface of the resin mold compound. 
   
   
       12 . The pump according to  claim 11 , wherein the case and the resin mold compound are, due to the metallic cover and the resin mold compound side cover respectively provided thereto, constrictedly secured in the axial direction. 
   
   
       13 . The pump according to  claim 10 , wherein the metallic cover and the resin mold compound side metallic cover each are affixed to a pump base to which a corresponding pump is attached. 
   
   
       14 . The pump according to  claim 9 , wherein a shape of the metallic cover and that of the resin mold compound side metallic cover are substantially identical. 
   
   
       15 . The pump according to  claim 14 , wherein:
 the metallic cover has formed thereon an opening at an area thereof corresponding to the intake portion; and   provided is a rib for preventing an exposure, to an outside of the pump, of the resin mold compound at an area of the opening, and for increasing durability of the resin mold compound.   
   
   
       16 . A pump, comprising:
 a pump chamber formed inside a case, formed of a resin material, for forming a pathway for fluid;   at least one intake portion connected to the pump chamber for intaking therein the fluid;   at least one discharge portion connected to the pump chamber for discharging therefrom the fluid;   a rotor located inside the pump chamber and having therein a rotor magnet, the rotor rotating along a predetermined rotary shaft;   an impeller rotating along with the rotor so as to direct the fluid to a predetermined direction; and   a stator located opposing to the rotor magnet, while having a gap therebetween, outside of the pump chamber, wherein the stator includes therein an armature which is a generator of a magnetic field, wherein:
 the stator includes therein a resin mold compound having formed therein an armature molded with the resin material; 
 the resin mold compound and the case make contact with each other and are affixed to each other; and 
 a metallic cover, for increasing durability of the resin mold compound, is affixed to a portion of the resin mold compound. 
   
   
   
       17 . A pump, comprising:
 a pump chamber formed inside a case, formed of a resin material, for forming a pathway for fluid;   at least one intake portion connected to the pump chamber for intaking therein the fluid;   at least one discharge portion connected to the pump chamber for discharging therefrom the fluid;   a rotor located inside the pump chamber and having therein a rotor magnet, wherein the rotor rotates along a predetermined rotary shaft;   an impeller rotating along with the rotor so as to direct the fluid to a predetermined direction;   a stator located opposing to the rotor magnet, while having a gap therebetween, outside of the pump chamber;   the stator including therein a resin mold compound molding therein an armature which is a generator of a magnetic field;   the resin mold compound located such that a portion thereof makes contact with an outer surface of the case; and   a reinforcement board embedded in the portion of the resin mold compound making contact with the case.   
   
   
       18 . The pump according to  claim 14 , wherein:
 the case includes an upper case and a lower case in an axial direction;   the lower case is cup shaped for containing therein the rotor;   the resin mold compound is provided so as to cover over at least a portion of a circumferential surface and a portion of a bottom surface of the cup shaped lower case; and   a reinforcement board is embedded at a bottom portion of the cup shaped lower case opposing the rotor magnet.   
   
   
       19 . The pump according to  claim 18 , wherein:
 the resin mold compound has embedded therein a control circuit board below the stator;   the control circuit board has a surface facing the bottom portion of the cup shaped lower case in the axial direction; and   the reinforcement board is embedded between the bottom portion and the control circuit board in the axial direction.   
   
   
       20 . The pump according to  claim 17 , wherein the reinforcement board is formed of a material selected from the group consisting of stainless steel and aluminum alloy. 
   
   
       21 . The pump according to  claim 17 , wherein:
 a case side reinforcement board is embedded for increasing durability of the case against an internal pressure of the fluid inside the pump chamber; and   the case side reinforcement board is provided at an area surrounding the intake portion of the case.   
   
   
       22 . A pump, comprising:
 a pump chamber formed inside a case, formed of a resin material, for forming a pathway for fluid;   at least one intake portion connected to the pump chamber for intaking therein the fluid;   at least one discharge portion connected to the pump chamber for discharging therefrom the fluid;   a rotor located inside the pump chamber and having therein a rotor magnet, wherein the rotor rotates along a predetermined rotary shaft;   
     an impeller rotating along with the rotor so as to direct the fluid to a predetermined direction;
 a stator located opposing to the rotor magnet, while having a gap therebetween, outside of the pump chamber, wherein the stator includes therein an armature which is a generator of a magnetic field; 
 a metallic cover affixed, for increasing durability of the case, to a portion of the case to which an internal pressure generated by the fluid inside the pump chamber is applied; and 
 a case side reinforcement board being embedded for increasing durability of the case against an internal pressure of the fluid inside the pump chamber, wherein the case side reinforcement board is provided at an area surrounding the intake portion of the case. 
 
   
   
       23 . The pump according to  claim 22 , wherein:
 the stator includes therein a resin mold compound having formed therein an armature molded with the resin material; and   the resin mold compound is located for making contact with an outer surface of the case.   
   
   
       24 . A pump, comprising:
 a pump chamber formed inside a case, formed of a resin material, for forming a pathway for fluid;   at least one intake portion connected to the pump chamber for intaking therein the fluid;   at least one discharge portion connected to the pump chamber for discharging therefrom the fluid;   a rotor located inside the pump chamber and having therein a rotor magnet, wherein the rotor rotates along a predetermined rotary shaft;   an impeller rotating along with the rotor so as to direct the fluid to a predetermined direction;   a stator located opposing to the rotor magnet, while having a gap therebetween, outside of the pump chamber;   the stator including therein a resin mold compound molding therein an armature which is a generator of a magnetic field;   the resin mold compound located such that a portion thereof makes contact with an outer surface of the case; and   a filler provided in a space between the resin mold compound and the outer surface of the case.   
   
   
       25 . The pump  25  according to  claim 24 , wherein:
 the case includes an upper case and a lower case in an axial direction;   the lower case is cup shaped for containing the rotor via a gap surrounding a circumferential surface and a bottom surface of the rotor magnet in the rotor;   the resin mold compound is provided so as to cover over at least a portion of a circumferential surface and a portion of a bottom surface of the cup shaped lower case; and   a filler is provided at a portion of a space between an outer circumferential surface and a bottom surface of the cup shaped lower case, and an inner circumferential surface of the resin mold compound.   
   
   
       26 . The pump according to  claim 24 , wherein the filler is provided covering over a weld line generated on the case and on the resin mold compound. 
   
   
       27 . The pump according to  claim 24 , wherein the filler is silicon based. 
   
   
       28 . The pump according to  claim 1 , wherein the metallic cover is thicker than, approximately, 2 mm. 
   
   
       29 . The pump according to  claim 1 , wherein:
 the metallic cover is thinner than, approximately, 2 mm; and   the metallic cover has provided thereon a rib so as to increase durability of the metallic cover.   
   
   
       30 . A pump, comprising:
 a pump chamber formed inside a case, formed of a resin material, for forming a pathway for fluid;   at least one intake portion connected to the pump chamber for intaking therein the fluid;   at least one discharge portion connected to the pump chamber for discharging therefrom the fluid;   a rotor located inside the pump chamber and having therein a rotor magnet, wherein the rotor rotates along a predetermined rotary shaft;   an impeller rotating along with the rotor so as to direct the fluid to a predetermined direction;   a stator located opposing to the rotor magnet, while having a gap therebetween, outside of the pump chamber, wherein the stator includes therein an armature which is a generator of a magnetic field; and   a reinforcement element affixed, for increasing durability of the case, to a portion of the case to which an internal pressure generated by the fluid inside the pump chamber is applied.   
   
   
       31 . The pump according to  claim 30 , wherein:
 the stator includes therein a resin mold compound having formed therein an armature molded with the resin material; and   the resin mold compound is located for making contact with an outer surface of the case.   
   
   
       32 . The pump according to  claim 1 , wherein the pump is used for a water heater used for a heating system operable to simultaneously distribute hot water to a plurality of outlets.