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US 2003/0152474 A1Published application
Pump for conveying molten masses of polymers and elastomers
AssigneeAlfatech S.R.L.
InventorMacchi Luigi
Life of this patent
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AssigneeAlfatech S.R.L.
InventorMacchi Luigi
Estimating the term…
A pump (1) for conveying molten masses of polymers and/or elastomers comprising a pump body in which are formed an inlet duct (7) for entry of the material, an outlet duct (8) for discharge of the material and a central body (11) communicating with the inlet and outlet ducts (7, 8) and destined to house at least one gear (15, 16) mounted on a motorised shaft (18) for conveying the material from the inlet duct (7) toward the outlet duct (8). The pump body consists of two parts (2, 2′) that can be assembled together, each part of the pump body comprising at least one through hole (14) communicating with the central chamber (11), so that said at least one shaft (18) of the gear (15, 16) is rotatably supported directly in the pair of opposite facing holes (14) of the two parts (2, 2′) of the pump body.
A pump (1) for conveying molten masses of polymers and/or elastomers comprising a pump body in which are formed:
A pump (1) according to any one of the preceding claims, characterised in that the inner side edges (12) of said inlet and outlet ducts (7, 8), the conjunction edges (13) between said inlet and outlet ducts (7, 8) and said central seat (11) of the gears, and the peripheral edges (17) of said through holes (14) supporting the shafts of the gears are rounded to avoid the formation of sharp edges in which material stagnates.
A pump (1) according to any one of the preceding claims, characterised in that at least one end (20) of said at least one shaft (18) of said gears has a substantially conical or frusto conical shape to engage, in a rotating conical coupling relationship, in a cover (21) defining a substantially conical or frusto conical seat complementary to said end (20) of the shaft of the gear, said conical cover (21) being fixed on the outside of said pump body.
A pump (1) according to any one of the preceding claims, characterised in that a toothing (19) is mounted on the shaft (18) of said gears (15, 16), each tooth (40) of which has a substantially rounded side profile (41) and the root fillet between one tooth (40) and the next is substantially rounded.
A pump (1) according to any one of the preceding claims, characterised in that in said two parts (2, 2′) of the pump body, around said central seat (11) of the gears, seats (24) are provided wherein a plurality of through holes (25) are formed for the passage of a fluid for heat regulation of the pump (1).
A pump (1) according to any one of the preceding claims, characterised in that the shafts (18) of said gears (15, 16) have an axial duct wherein a fluid for heat-regulation of the pump can flow.
Dependencies are inferred from the claim text.