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BR-202024018134-U2 - INSERT FOR TORQUE TRANSMISSION IN AN ELECTRIC PUMP

BR202024018134U2BR 202024018134 U2BR202024018134 U2BR 202024018134U2BR-202024018134-U2

Abstract

An insert (10) for a centrifugal electric pump (1) is described, suitable for transmitting torque from a motor shaft (51) of the motor (5) to an impeller (4) internal to the volute (3). The insert is a monobloc piece comprising a central body (12), a disc skirt (13), and a quadrangular radial impeller (11) joined at a first edge to the skirt (13), and at a second edge adjacent to the central body (12). The central body (12) defines an internal channel (24) from the lower surface (22) to the upper surface (20), wherein the through hole (21), the internal channel (24) and the through hole (19) are shaped corresponding to the shape of the end (54) of the motor shaft (51). The surface of the central body (12) defines two diametrically opposed claws (16), each claw having a triangular tooth (17).

Inventors

  • DANILO FRANCISCO DE JESUS
  • FÁBIO FORTUNATO CHRISTIANO
  • FABIO HIROYUKI YUNOKI

Assignees

  • Emicol Eletro Eletrônica S.A.

Dates

Publication Date
20260317
Application Date
20240903

Claims (4)

  1. 1. Insert (10) for torque transmission in an electric pump (1), characterized by being a monobloc piece comprising a hollow cylindrical central body (12), a disc-shaped skirt (13) projecting radially outwards and a radial impeller (11) of quadrangular shape and joined at a first edge to the skirt (13), and at a second edge, adjacent to the first edge, to the central body (12); and wherein the central body (12) internally defines a longitudinal internal channel (24), which extends from a through hole (19) in the lower surface (23) to a through hole (21) in the upper surface (20), wherein the through hole (21), the internal channel (24) and the through hole (19) are shaped in correspondence with the shape of the end (54) of the motor shaft (51) of the motor (5); and wherein the surface of the central body (12) defines two claws (16) diametrically opposed to each other, each of said claws (16) having a respective triangular tooth (17) at its respective lower ends.
  2. 2. Insert, according to claim 1, characterized in that said radial impeller (11) is defined as a U-shaped body lying down, whose mouth is radially turned inwards, and wherein the inner median region has a rib (14) from the central body (12) to the peripheral apex (15).
  3. 3. Insert, according to claim 1, characterized in that the lower surface (23) of the insert (10), defined by the lower face of the skirt (13), comprises a central recess (18) surrounding the through hole (19).
  4. 4. Insert, according to claim 1, characterized in that said shape of the through hole (21), the internal channel (24) and the through hole (19) is polygonal, regular or irregular, and not cylindrical; and wherein said shape is preferably quadrangular; and wherein said shape is more preferably oblong; and wherein said shape is even more preferably oblong with a larger dimension straight and a smaller dimension rounded.

Description

[001] The present model refers to an insert for torque transmission in an electric pump. More specifically, the model refers to an insert improved in durability and engagement, suitable for transmitting the rotational movement of an electric motor to the blades of a centrifugal pump. State of the Art [002] In various devices of the so-called white goods line, such as washing machines or dishwashers, a centrifugal type electric pump is used to remove the washing water from inside a tub and direct it, under pressure, to an outlet hose. Similarly, pressurized showers and showerheads also use a centrifugal electric pump. The pressurization of the outgoing water flow occurs in a chamber, called a volute, which has a longitudinal inlet and a radial outlet. Inside the volute rotates the impeller, a rotor-type component equipped with radial blades projecting from its longitudinal axis. The rotation of the impeller is generated by an electric motor whose drive shaft couples the impeller in an mediated way by an insert directly fixed to the shaped end of the drive shaft. [003] The transmission of rotation mediated by the insert is due to the motor's starting moment. More specifically, and as is known, the maximum torque generated by an electric motor is "almost" instantaneous, that is, the maximum torque is produced even at low speeds. Thus, it is important that, at startup, its drive shaft can rotate freely (without load) through the largest possible angular displacement, so that the engagement in rotation with the impeller can occur at an advanced position, in time, of the electric motor's torque curve. [004] To that end, US patent 7097434 discloses a transmission in which the insert is provided with a radially projecting tooth, or impeller, while the impeller is provided with a seat at its lower end, with an opening at the bottom and capable of receiving the insert. Said impeller seat is provided with an internal radial wall capable of mechanically interacting with the projecting tooth of the insert, thus transmitting the rotation of the motor to the impeller. During motor start-up, the angular phase shift between the insert tooth and the wall of the impeller seat allows free angular rotation of the motor before the tooth reaches the radial wall. [005] Although this solution is efficient, it is not without drawbacks. Firstly, each time the motor starts, a mechanical shock occurs between the wall of the impeller seat and the insert tooth which, over time, can lead to the tooth breaking. On the other hand, constant mechanical shocks can also compromise the engagement of the insert on the formed motor shaft, compromising the rotational coupling of these components. [006] Thus, an objective of the present model is to provide a suitable impetus to overcome the drawbacks of art. Summary of the Invention [007] This and other specific objectives are satisfied by means of an insert for torque transmission in an electric pump, the insert being a monobloc piece comprising a hollow cylindrical central body, a disc-shaped skirt projecting radially outwards and a radial impeller of quadrangular shape joined at a first edge to the skirt, and at a second edge, adjacent to the first edge, to the central body; and the central body internally defining a longitudinal internal channel, which extends from a through hole in the lower surface to a through hole in the upper surface, the through hole, the internal channel and the through hole being shaped in correspondence with the shape of the motor shaft end of the motor; and the surface of the central body defining two diametrically opposed claws, each of said claws having a respective triangular tooth at its respective lower ends. [008] Furthermore, the radial impeller is defined as a U-shaped body lying on its side, whose mouth is radially oriented inwards, and whose internal median region has a rib from the central body to the peripheral apex. [009] Furthermore, the lower surface of the insert, defined by the lower face of the skirt, comprises a central recess surrounding the through hole. [0010] Finally, the said shape of the through hole, the internal channel and the through hole is to be polygonal, regular or irregular, and not cylindrical; preferably the said shape is quadrangular; more preferably the said shape is oblong; and even more preferably, the said shape is oblong with a straight major dimension and a rounded minor dimension. Brief Description of the Figures [0011] The object of the present solution can be better understood from the detailed description that follows, in a preferred and non-limiting embodiment, which is made with the support of the attached figures, brought by way of illustration and not limitation, in which: - Figure 1 is a bottom perspective view of the insert of the present model; - Figure 2 is a top and sectional perspective view of the insert of Figure 1; - Figure 3A is a perspective view of an electric pump and Figure 3B is a sectional and exploded