Centrifugl pump

Abstract

A centrifugal pump (100) comprises a pump housing (1), a heating device (22), a flow guide member (3) and an impeller (4). The pump housing (1) is provided with a heating chamber (11) and a pump chamber (12) in communication with the heating chamber (11) therein. The pump housing (1) is provided with an inlet (130) in communication with the heating chamber (11) and an outlet (140) in communication with the pump chamber (12). The heating device (22) is disposed on the pump housing (1). The flow guide member (3) is disposed within the heating chamber (11). The flow guide member (3) defines spreading channels guiding fluids entering through the inlet (130) to spread outwards along a radial direction of the heating device (22) and converging channels guiding the spread fluids to converge inwards along the radial direction of the heating device (22) to the pump chamber (12) in the heating chamber (11). The impeller (4) is disposed within the pump chamber (12) and guides the fluids converged in the pump chamber (12) to the outlet (140). The centrifugal pump structure is compact and small-sized, thus having a high space utilization rate and also good hydraulic performance.

1 . A centrifugal pump, comprising:
 a pump housing, internally defining a heating chamber and a pump chamber in communication with the heating chamber, and provided with an inlet in communication with the heating chamber and an outlet in communication with the pump chamber;   a heating device, provided on the pump housing;   a flow guide member, provided in the heating chamber and defining a spreading channel and a converging channel in the heating chamber, the spreading channel being configured to guide fluid entering through the inlet to spread outwards along a radial direction of the heating device, and the converging channel being configured to guide the spread fluid to converge inwards along the radial direction of the heating device to the pump chamber; and   an impeller, provided in the pump chamber and configured to guide the fluid converged in the pump chamber to the outlet.   
     
     
         2 . The centrifugal pump according to  claim 1 , wherein the spreading channel guides the fluid entering through the inlet to spread spirally outwards along the radial direction of the heating device, and the converging channel guides the spread fluid to converge spirally inwards along the radial direction of the heating device to the pump chamber. 
     
     
         3 . The centrifugal pump according to  claim 1 , wherein the flow guide member comprises:
 a separating plate;   a plurality of spiral vanes provided at a side of the separating plate facing the heating device, and defining the spreading channel at the side of the separating plate facing the heating device; and   a plurality of reverse spiral vanes provided at another side of the separating plate facing the pump chamber, and defining the converging channel at the another side of the separating plate facing the pump chamber.   
     
     
         4 . The centrifugal pump according to  claim 3 , wherein a first of the spiral vanes and the reverse spiral vanes are shifted clockwise from inside to outside along a radial direction of the separating plate, whereas a second of the spiral vanes and the reverse spiral vanes are shifted counterclockwise from inside to outside along the radial direction of the separating plate. 
     
     
         5 . The centrifugal pump according to  claim 3 , wherein the plurality of reverse spiral vanes are connected to a bottom wall of the heating chamber, the plurality of spiral vanes are connected to the separating plate, and the separating plate is supported on the plurality of reverse spiral vanes. 
     
     
         6 . The centrifugal pump according to  claim 5 , wherein the plurality of reverse spiral vanes are integrally formed on the pump housing, and the plurality of spiral vanes are integrally formed on the separating plate. 
     
     
         7 . The centrifugal pump according to  claim 5 , wherein the separating plate is provided with a positioning hole, the reverse spiral vane is provided with a positioning column, and the positioning column is fitted in the positioning hole. 
     
     
         8 . The centrifugal pump according to  claim 7 , wherein a plurality of positioning columns are provided and disposed to inner ends of corresponding reverse spiral vanes, a plurality of positioning holes are provided and spaced along a circumferential direction of the separating plate, and the plurality of positioning columns are fitted in the plurality of positioning holes respectively. 
     
     
         9 . The centrifugal pump according to  claim 3 , wherein the plurality of reverse spiral vanes and the plurality of spiral vanes are connected to the separating plate, and the plurality of reverse spiral vanes are supported on a bottom wall of the heating chamber. 
     
     
         10 . The centrifugal pump according to  claim 9 , wherein the plurality of reverse spiral vanes, the plurality of spiral vanes and the separating plate are integrally formed. 
     
     
         11 . The centrifugal pump according to  claim 3 , wherein the pump housing has an inlet pipe extending into the heating chamber, the inlet is provided in the inlet pipe, inner ends of the spiral vanes are provided with engaging notches, and an end of the inlet pipe that extends into the heating chamber is fitted in the engaging notches of the plurality of spiral vanes. 
     
     
         12 . The centrifugal pump according to  claim 3 , wherein a side surface of the separating plate facing the heating device is provided with a flow guide block in a center of the side surface, and the flow guide block is configured to guide the fluid entering through the inlet to the plurality of spiral vanes. 
     
     
         13 . The centrifugal pump according to  claim 12 , wherein the flow guide block is conical, and a vertex of the flow guide block is rounded off 
     
     
         14 . The centrifugal pump according to  claim 3 , wherein an outer peripheral edge of the separating plate is more adjacent to the heating device compared with that the outer peripheral edge of the separating plate is adjacent to the pump chamber, and a center of the separating plate is more adjacent to the pump chamber compared with that the center of the separating plate is adjacent to the heating device. 
     
     
         15 . The centrifugal pump according to  claim 1 , wherein a central axis of the inlet, a central axis of the pump housing, a central axis of the heating device, a central axis of the flow guide member, and a central axis of the impeller coincide with each other; the heating chamber and the pump chamber are communicated at the central axis of the pump housing; the outlet is provided in an outer peripheral wall of the pump housing, and a central axis of the outlet is tangent to the outer peripheral wall of the pump housing. 
     
     
         16 . The centrifugal pump according to  claim 1 , wherein the pump housing comprises:
 a housing body, the heating chamber and the pump chamber being defined in the housing body, and the outlet being provided in the housing body;   a casing body, detachably mounted to the housing body and pressing the heating device to an upper end of the housing body; and   an inlet pipe, the inlet pipe being provided on the casing body, and the inlet being provided in the inlet pipe.   
     
     
         17 . The centrifugal pump according to  claim 1 , wherein the heating device is configured as an annular heating plate having a central through hole, and a position of the central through hole corresponds to a position of the inlet in a vertical direction. 
     
     
         18 . The centrifugal pump according to  claim 17 , wherein at least one of an upper surface and an outer peripheral surface of the heating device is provided with a resistance coating. 
     
     
         19 . The centrifugal pump according to  claim 17 , wherein a seal ring is provided between an inner peripheral edge of the heating device and the pump housing for sealing, and another seal ring is provided between an outer peripheral edge of the heating device and the pump housing for sealing, and a thermal insulation member is provided between the inner peripheral edge and/or the outer peripheral edge of the heating device and the corresponding seal ring. 
     
     
         20 . The centrifugal pump according to  claim 1 , further comprising:
 a terminal box, provided on the heating device; and   a wiring terminal, provided in the terminal box, electrically coupled with the heating device, and exposed out of the pump housing.