FR3071279A1 - PUMP ASSEMBLY WITH WET AREA ACCESSIBLE BY THE USER - Google Patents

Abstract

The present invention relates to a centrifugal pump assembly (10), with an electric motor (19) disposed in a stator housing (11), wherein a housing (13), containing an electrical board (14) and closed to the free end by a cover (15), is positioned at an axial end of said stator housing (11), said pump assembly (10) comprising a wet zone, which is characterized in that it comprises a plug (35) having , at one end, a template (43) adapted to fit into a hole communicating with said wet area, serving as a shutter, and at the other end, a head (40) adapted to be easily accessible by the user said plug (35) having a length such that the outer surface of said head (40) is at a level close to that of the lid (15) of said case (13) in the closed configuration.

Description

PUMP ASSEMBLY WITH WET AREA ACCESSIBLE BY THE USER

An object of the present invention is a centrifugal pump assembly, with an electric motor.

Nowadays, there are known sets of centrifugal pumps essentially composed of a hollow body provided with suction and discharge conduits, containing one or more wheels interposed with diffusers and snapped onto the shaft of an electric motor enclosed in inside an engine body that isolates it from pumping liquid.

An electric card, contained in a box, supplies and controls the operation of the engine.

Such known techniques have certain drawbacks and aspects which can be improved.

Normally, the unlocking of the wheel shaft, after long periods of non-use, is done automatically by an electronically controlled system, but this system may not always be efficient enough.

In addition, the plug, when present, has a size and a shape which make it difficult for the user to access.

Again, the plug, when present, is distinguished by a volume such that it can generate a thermal bridge from the wet zone and the peripheral zone, which causes damage.

The objective of the present invention is to provide a centrifugal pump assembly, with an electric motor which is able to improve the technique known in one or more aspects indicated above.

Within the framework of such an objective, an object of the invention is to produce a set of centrifugal pump, with an electric and electronic motor, which comprises a plug for unlocking the shaft manually on the part of the user who presents a more compact volume compared to similar pumps on the market.

Another object of the invention is to provide a centrifugal pump assembly, with an electric motor, in which said plug has a shape and a size such that it is easily accessible by the user.

Another object of the invention is to produce a centrifugal pump assembly, with an electric motor, in which said plug has a shape and a size such that it does not generate thermal bridges.

In addition, the present invention aims to overcome the drawbacks of the known technique, as an alternative to possible existing solutions.

Another object of the invention is to produce a centrifugal pump assembly, with an electric motor, which is very reliable, relatively easy to produce and at competitive costs.

Not only this objective, but also these objectives as well as the others which will emerge more clearly below, are achieved by a centrifugal pump assembly, with an electric motor, disposed in a stator housing, in which a housing, containing a card electric and closed at the free end by a cover, is positioned at an axial end of said stator housing, said pump assembly comprising a wet zone, which is characterized in that it comprises a plug having, at one end, a template able to be inserted into a hole communicating with said wet area, serving as a shutter and, at the other end, a head able to be easily accessible by the user, said plug having a length such that the external surface of said head turns out to be at a level close to that of the cover of said housing in the closed configuration.

Other characteristics and advantages of the invention will emerge mainly from the description of a preferred, but not exclusive, embodiment of the centrifugal pump assembly, with an electric motor, according to the invention, illustrated, for information only and not limiting, in the accompanying drawings, in which:

- Figure 1 illustrates a section of the pump assembly according to the invention;

- Figure 2 illustrates a perspective view of a plug for the pump assembly according to the invention.

With reference to the figures cited, the centrifugal pump assembly, with an electric motor according to the invention, is indicated as a whole by the reference number 10.

Said centrifugal pump assembly 10 comprises a wet area having suction and discharge conduits, not shown in the figures, of known type, and a impeller also not shown in the figures, of known type, immersed in said wet area.

Said wheel is wedged on a shaft 17 of an electric motor 19 composed of a stator 12 and a rotor 18. Said electric motor is positioned in a stator housing 11, capable of isolating it from the wet zone.

The centrifugal pump assembly 10 comprises, at one end, an electrical box 13 containing an electrical card 14 capable of controlling and supplying the electric motor 19. Said electrical box 13 is of cylindrical development and is closed at the free end by a cover 15. Advantageously, said electrical card 13 may also have a different development.

In particular, said electric motor 19 and said electric box 14 develop along the same axis X, coinciding with the axis of rotation of the motor and the wheel. Said electric motor 19 and said electric box 14 are connected and made integral by the presence of an intermediate element 16. Said intermediate element 16 is a connection and / or cover element and has a tubular shape.

Said electrical box 13 and said stator housing 11 have the mutually complementary contact surfaces. From said electrical box 13, one or more first pins 28 are developed capable of being inserted into corresponding through holes 29 present on the contact surface of the stator housing 11. Said pins 28 are capable of connecting the housing 13 and the housing of stator 11 and to facilitate the assembly of pump 10.

Similarly, said housing 13 has one or more second pins 30, developing inside the housing 13 and in the direction of the cover 15, the tips of which are suitable for insertion into corresponding holes present on the surface of the cover 15 facing the interior of the housing 13. Said pins 30 are capable of connecting the housing 13 and the cover 15 and facilitating the assembly of the pump 10.

Said electrical box 13 has, inside, a tubular body 34 with a development axis which coincides with the axis X. Said tubular body 34 extends from the contact surface with the stator housing 11 to the cover. 15 of said electrical box 13. In correspondence with the section of the tubular body 34, both the electrical card 14 and the cover 15 have a through hole 36 with a development axis which coincides with the axis X.

Advantageously, the development axis of the hole may not coincide with the X axis, but may be parallel to the latter.

Said through hole 36 and said tubular body 34 are suitable for inserting a plug 35 with one end in contact with the wet area. Said tubular body 34 and said hole 36 of said cover 15 have dimensions and shapes such that they guarantee interference and isolation of the electric card 14 from the wet zone, even in the case of the opening of the plug 35 .

In particular, said plug 35 has, at one end, a template 43 capable of fitting into a hole communicating with said wet area, serving as a shutter and, at the other end, a head 40 capable of being easily accessible by the user. Said plug 35 has a cylindrical development and a length such that the external surface of said head 40 turns out to be at a level close to that of the cover 15 of said housing 13 in the closed configuration. Said template 43 comprises an end discoid element 47 which continues in the hole communicating with said wet zone, with a threaded element 42 capable of defining the tightening of the plug 35 in the threaded hole in an antagonistic manner, by complementarity. Said discoid element 47 has dimensions equal to or comparable to those of said head 40.

The head 40 is disc-shaped and has a notch 44 capable of inserting the tip of a screwdriver to allow the screwing and unscrewing operation.

In an alternative embodiment, said stopper 35 comprises a stopper covering element, not visible in the figures, in order to conceal its presence and generate a more pleasant visual impact.

Said plug 35 has an intermediate section 41 which is also discoidal and with dimensions similar to that of the head 40 to facilitate the insertion of the plug into the hole 36 and into the tubular body 34.

Between said head 40 and said intermediate element 41, is inserted a first tubular section 45 with a diameter smaller than that of the head 40. Between said intermediate element 41 and said end element 47, is inserted a second tubular section 46 with a diameter smaller than that of the first tubular section 45.

The presence of these cylindrical sections with reduced diameter makes it possible to avoid thermal bridges and makes it possible to obtain a lighter plug at equal cost.

Said plug 35 is made of brass by means of turning and all of its parts, which are indicated in FIG. 2 with the reference numbers ranging from 40 to 47, are drawn from a single body.

Advantageously, said plug 35 can be made of stainless steel.

The seal between the wet area and the plug 35 is guaranteed by an O-ring 37, of known type, the seal between the wet area, the electrical box 13 and the stator housing 11 is guaranteed by a seal 38 of known type. .

From said electric card 14, male connection plates 24 are developed capable of fitting into female terminals 25 connected to the electric motor 19. In this way, the card 14 can power and control the electric motor 19.

Said electrical card 14 has, at one end, a connector 26 capable of being inserted into an electrical supply terminal, external to the pump. In correspondence with the insertion zone of said terminal, said housing 13 has an appendage 27 projecting from said intermediate element 16.

It should be noted that the presence of the plug according to the invention allows the wheel to be released through the shaft, on the part of the user, in manual mode.

In addition, it should be noted that the dimensions and shape of said plug allow easier access to the plug by the user.

It should also be noted that the presence, in the plug, of cylindrical sections interposed between the discoidal elements of head, median and end, with a reduced diameter compared to the latter, makes it possible to avoid the initiation of thermal bridges and defines a lighter weight cap at equal cost.

In practice, it has been found that the invention achieves the objective and the intended aims by producing a centrifugal pump assembly, with an electric motor, disposed in a stator housing, in which a housing containing an electric card and closed to the free end by a cover, and positioned at an axial end of said stator housing, said pump assembly comprising a wet zone, which is characterized in that it comprises a plug, having at one end a template suitable for s 'insert in a hole communicating with said wet area, serving as a shutter, and at the other end, a head capable of being easily accessible by the user, said plug having a length such that the external surface of said head s' turns out to be at a level close to that of the cover of said housing, in the closed configuration.

The invention, thus conceived, is susceptible to numerous modifications and variants, all coming within the framework of the concept of the invention; furthermore, all details may be replaced by other technically equivalent elements.

In practice, not only the materials used, as long as they are compatible with the specific use, but also the dimensions and contingent shapes, can be any according to requirements and state of the art.

When the features and techniques mentioned in any one of the claims are followed by reference signs, such signs have been used for the sole purpose of increasing the intelligibility of the claims and therefore such reference signs are not used. have no limiting effect on the interpretation of each element identified by way of example with such reference signs.

Claims (15)

1. Centrifugal pump assembly (10), with an electric motor (19) disposed in a stator housing (11), in which a housing (13) containing an electric card (14) and closed at the free end by a cover (15), is positioned at an axial end of said stator housing (11), said pump assembly (10) comprising a wet zone, which is characterized in that it comprises a plug (35) having, at one end , a template (43) capable of being inserted into a hole communicating with said wet area, serving as a shutter, and at the other end, a head (40) capable of being easily accessible by the user, said plug ( 35) having a length such that the external surface of said head (40) turns out to be at a level close to that of the cover (15) of said housing (13) in the closed configuration. 2. Centrifugal pump assembly (10) according to claim 1, characterized in that said plug (35) has an intermediate section (41) of dimensions similar to those of said head (40). 3. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said cap (35) has a cap-covering element capable of concealing its presence. 4. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said template (43) comprises a discoidal end element (47) continuing in the hole, communicating with said wet area, with an element threaded (42). 5. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said head (40) is discoidal and has a notch (44) suitable for insertion of the tip of a screwdriver. 6. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that between said head (40) and said median element (41) is interposed a first tubular section (45) with a diameter less than that of said head (40) and in that between said median element (41) and said end element (47), there is interposed a second tubular section (46) of smaller diameter than that of said first tubular section (45 ). 7. centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said electrical box (13) has, internally, a tubular body (34) with an axis of development which coincides or is parallel to that of development of said housing (13). 8. Centrifugal pump assembly (10) according to the preceding claim, characterized in that said tubular body (34) has an extension of the contact surface with said stator housing (11) to said cover (15) of said housing (13) . 9. centrifugal pump assembly (10) according to the preceding claim, characterized in that, in correspondence with the section of said tubular body (34), both the electric card (14) and said cover (15) have a through hole (36 ) with an axis of development which coincides with that of said tubular body (34). 10. Centrifugal pump assembly (10) according to the preceding claim, characterized in that said through hole (36) and said tubular body (34) are suitable for the insertion of said plug (35). 11. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said electrical box (13) and said stator housing (11) have mutually complementary contact surfaces. 12. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said housing (13) has one or more first pins (28) capable of being inserted in corresponding through holes (29) present on the contact surface of the stator housing (11). 13. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said housing (13) has one or more second pins (30), developing inside the housing (13) and in the direction of the cover (15), the points of which are suitable for insertion into corresponding holes present on the surface of the cover (15) facing the interior of the housing (13). 14. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said electrical card (14) has male connection plates (24) capable of being inserted in female terminals (25) connected to said electric motor (19). 15. Centrifugal pump assembly (10) according to one or more of the preceding claims, characterized in that said electrical card (14) has, at one end, a connector (26) capable of being inserted in an electrical supply terminal, external to the pump.