Patent Application
20190085848
This application is related to, and claims the benefit of, Italian Patent Application No. 102017000103807, filed on Sep. 18, 2017, the contents of which are herein incorporated by reference in their entirety.
The present disclosure relates to a centrifugal pump assembly, with electric motor.
The disclosure also relates to a covering and/or connecting element for such a centrifugal pump assembly, with electric motor.
Conventional centrifugal pump assemblies are composed substantially of a hollow body provided with intake and deliver ducts and containing one or more impellers interleaved by diffusers and keyed on the shaft of an electric motor enclosed inside a motor casing that isolates it from the pumping liquid.
An electrical board, contained in a box, powers and controls the operation of the motor.
In some cases, around the casing and the electrical box there is a covering element adapted to keep the pump assembly together.
These known techniques have drawbacks and aspects that can be improved.
The electric motor and the electrical box are usually fixed by using screws and this determines an expenditure in terms of time and costs for the provision of the product and for its maintenance.
The covering element, where present, is also fixed by means of screws and this determines an expenditure in terms of time and costs for the provision of the product and for its maintenance.
Furthermore, the covering element, where present, is not a structural element but serves only as an aesthetic element.
The aim of the present disclosure is to provide a centrifugal pump assembly, with electric motor, that is capable of improving the background art in one or more of the above-mentioned aspects.
Within this aim, the disclosure provides a centrifugal pump assembly, with electric motor, that comprises an intermediate covering and/or connecting element between the electric motor and the electrical box.
The disclosure also provides a centrifugal pump assembly, with electric motor, in which said covering and/or connecting element is fixed to the assembly by reducing the costs and time necessary for assembling and maintaining the product.
The disclosure further provides a centrifugal pump assembly, with electric motor, in which said covering and/or connecting element is customizable and has a pleasant visual impact.
The disclosure provides a centrifugal pump assembly, with electric motor, that comprises an element capable of protecting at least partially the user from the heat generated in the electric motor casing.
The present disclosure overcomes the drawbacks of the background art in a manner which is alternative to any existing solutions.
The disclosure further provides a centrifugal pump assembly, with electric motor, that is highly reliable, relatively easy to provide and at competitive costs.
This aim and these and other advantages which will become better apparent hereinafter are achieved by providing a centrifugal pump assembly, with electric motor, arranged in a stator housing, in which a box, containing an electrical board, is arranged at one end of said stator housing, characterized in that it comprises an intermediate element between said motor and said box, adapted to be integral therewith, being complementary, on one side, to said stator and, on the other side, to said box.
Further characteristics and advantages of the disclosure will become better apparent from the description of a preferred but not exclusive embodiment of the centrifugal pump assembly, with electric motor, according to the disclosure, illustrated by way of non-limiting example in the accompanying drawings, wherein:
With reference to the
The centrifugal pump assembly 10 comprises a wet region having intake and delivery ducts, not shown in the figures, of the known type, and an impeller, also not shown in the figures, of the known type, submerged in the wet region.
The impeller is keyed on a shaft 17 of an electric motor 19 composed of a stator 12 and a rotor 18. The electric motor is placed in a stator housing 11, adapted to insulate it from the wet region.
The centrifugal pump assembly 10 comprises, at one end, an electrical box 13, which contains an electrical board 14 adapted to control and power the electric motor 19. The electrical box 13 has a cylindrical shape and is closed at the free end by a lid 15.
In particular, the electric motor 19 and the electrical box 14 are extended along a same axis X, which coincides with the rotational axis of the motor and of the impeller. The electric motor 19 and the electrical box 14 are connected and rendered integral by the presence of an intermediate element 16. The intermediate element 16 is a connecting and/or covering element and has a tubular shape.
The intermediate element 16 is made of plastic material and has some raised portions on its surface which can be customized. At the same time, the color of the intermediate element 16 can also be customized so as to generate a pleasant visual impact in the user.
A particularity of the intermediate element 16 resided in the type of fixing to the electrical box 13 and to the stator housing 11. In fact, the connecting element 16 has components adapted to be complementary, on one side, to components of the electrical box 13 and, on the other side, to components of the stator housing 11, generating couplings by interlocking with interference.
Advantageously, the intermediate element 16 can fix the box 13 to said stator housing even in a different manner.
With reference to
Likewise, with reference to
The intermediate element 16 has such a dimension to cover, at least partially, both the box 13 and the stator housing 11. In a constructive variation, the intermediate element 16 covers the box 13, on one side, and the stator housing 11 up to the section for connection therewith.
In particular, the electrical box 13 and the stator housing 11 have mutually complementary contact surfaces. From the electrical box 13 one or more first pins 28 extend which are adapted to be inserted in corresponding through holes 29 present on the contact surface of the stator housing 11. The pins 28 are adapted to connect the box 13 and the housing 11 and to facilitate the assembly of the pump 10.
Likewise, the box 13 has one or more second pins 30, which are extended inside the box 13 and in the direction of the lid 15, the tips of which are adapted for insertion in corresponding holes present on the surface of the lid 15 that is directed toward the inside of the box 13. The pins 30 are adapted to connect the box 13 and the lid 15 and to facilitate the assembly of the pump 10.
Male connecting plates 24 extend from the electrical board 14 and are adapted to enter female terminals 25 connected to the electric motor 19. In this manner, the board 14 can power and control the electric motor 19.
The electrical board 14 has, at one end, a connector 26 adapted to be inserted in an electric power supply terminal, which is external to the pump. At the region of insertion of said terminal, the box 13 has a tab 27 that protrudes with respect to the intermediate element 16.
The stator housing 11 has, at the end that is opposite the end for contact with the electrical box 13, a perimetric annular tab 31 having a plurality of through holes 32, adapted to the insertion of screws 34 for fixing the stator housing 11 to the body of said intake and delivery ducts, not visible in the figures.
The electrical box 13 is provided internally with a tubular body 34 with an axis of extension that coincides with the axis X.
Advantageously, the tubular body 34 can have an extension that does not coincide with the axis X, but is parallel thereto.
The tubular body 34 extends from the surface of contact with the stator housing 11 to the lid 15 of the electrical box 13. At the cross-section of the tubular body 34, both the electrical board 14 and the lid 15 have a through hole 36 with an axis of extension that coincides with the axis X. The through hole 36 and the tubular body 34 are adapted for the insertion of a venting or inspection plug 35 with an end in contact with the wet region. The tubular body 34 and the hole 36 of the lid 15 have such dimensions and shapes to ensure an interference and insulation of the electrical board 14 from the wet region, even in the event of venting.
The seal between the wet region and the plug 35 is ensured by an O-ring 37, of the known type, the seal of which between the wet region, the electrical box 13 and the stator housing 11 is ensured by a gasket 38 of the known type.
The gasket 38 is co-molded on the box 13.
It should be noted that the intermediate element 16 according to the disclosure allows to connect and render the electric motor 19 and the electrical box 13 integral by simple interlocking, without the need to use fixing screws, reducing the number of operations and the assembly and maintenance costs.
Furthermore, it should be noted that said intermediate element 16 partially protects the user from the heat generated during the operation of the motor 19 on the stator housing 11.
It should be noted also that the intermediate element 16 allows a customization both in terms of shape and in terms of color, generating a pleasant visual impact.
In practice it has been found that the disclosure achieves the intended aims and advantages by providing a centrifugal pump assembly, with electric motor, arranged in a stator housing, in which a box is arranged at one end of said stator housing, and comprising an intermediate element between the motor and the box, adapted to be integral therewith, being complementary, on one side, to the stator and, on the other side, to the box.
The disclosure thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may further be replaced with other technically equivalent elements. In practice, the materials used, so long as they are compatible with the specific use, as well as the contingent shapes and dimensions, may be any according to the requirements and the state of the art.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102017000103807 | Sep 2017 | IT | national |
