ES2703131T3 - Controlled cavitation device - Google Patents

Abstract

A cavitation device (10) comprising: - a shaft (11) configured to be coupled with motor means (1), said shaft (11) extending along an axial direction (X-X), - a housing (20) defining a cylindrical chamber (21) having an inner cylindrical surface (21a), said housing having a fluid inlet port (22) and a fluid outlet port (23), - a rotor (30 ) arranged inside said cylindrical chamber (21) of said casing (20) and mounted on said shaft (11) so as to rotate about a rotor axis (X) extending along said axial direction ( X - X), - a fluid inlet conduit (24) coupled with said fluid inlet port (22) for supplying fluid to the interior of said cylindrical chamber (21), said fluid inlet conduit having ( 24) an inlet shaft (B) extending along an inlet direction (B - B), - a fluid outlet conduit (25) coupled with dic ho fluid outlet port (23) for receiving fluid from said cylindrical chamber (21), said fluid outlet conduit (23) having an outlet axis (C) extending along a direction of outlet (C-C), wherein: - said casing (20) comprises: - a first side wall (26a) and a second side wall (26b) which is spaced in the axial direction from said first side wall (26a), - a cylindrical body (27) extending in the axial direction between said first and second side walls (26a, 26b) and joining said first and second side walls (26a, 26b), - said rotor (30) comprising: - a first lateral surface (31) and a second lateral surface (32) that is spaced in the axial direction from said first lateral surface (31), - a cylindrical peripheral surface (33) that extends in the axial direction between said first and second lateral surfaces (31, 32) and joining said first and second side surfaces (31 , 32), - at least two sets of holes (34) that are formed in said cylindrical peripheral surface (33), the holes (34) of each set of holes being arranged in a row that extends around said cylindrical peripheral surface (33), each hole (33) extending in a radial direction to the inside of said rotor (30) from said cylindrical peripheral surface (33), - said cylindrical chamber (21) comprises a cylindrical inlet chamber (28a) formed between said first lateral surface (31) and said first lateral wall (26a) and a cylindrical outlet chamber (28b) formed between said second lateral surface (32) and said second lateral wall (26b), - a cavitation zone (35) that is defined between said cylindrical peripheral surface (33) of the rotor (30) and said inner cylindrical surface (21a) of the cylindrical chamber (21) of the casing (20), and in which: - said inlet direction (B - B) of said input shaft (B) is perpendicular to said axial direction (X-X) of said rotor axis (X), - said output direction (C-C) of said output shaft (C) is perpendicular to said axial direction (X-X) of said rotor shaft (X), - said inlet port (22) is located in said casing (20) for the purpose of introducing fluid into said cylindrical inlet chamber (28a) in an axial position spaced from said first lateral surface (31) of the rotor (30), - said outlet port (23) is located in said casing (20) for the purpose of receiving fluid from said cylindrical outlet chamber (28b) in a spaced axial position of said second lateral surface (32) of the rotor (30), characterized in that: - the axial distance between the fluid inlet port (22) and the first lateral surface (31) of the rotor (30) is equal to or greater than the axial distance between the first lateral surface (31) and the second lateral surface (32) of the rotor (30); and - the axial distance between the fluid outlet port (23) and the second lateral surface (32) of the rotor (30) is equal to or greater than the axial distance between the first lateral surface (31) and the second lateral surface ( 32) of the rotor (30).

Description

DESCRIPTION

Controlled cavitation device

Technical field

The present invention relates to a controlled cavitation device.

BACKGROUND OF THE INVENTION

In the European patent document EP 610914 a cavitation device is described. This device comprises a housing defining a chamber formed by a cylindrical side wall and a pair of end plates, an axis passing through an axis of the chamber and a rotor mounted on the axis inside the chamber to the object to rotate with the axis.

The rotor has a surface facing the side wall which is provided with holes or holes evenly spaced and facing inwardly at a chosen angle. These voids generate turbulence in the fluid in a defined cavitation zone between the rotor and the interior surface of the chamber.

This device further comprises an inlet port for introducing fluid into the space between the rotor and the inner surface of the chamber, and an outlet port for extracting the treated fluid. A first and second fluid connections are connected to the inlet and outlet ports, which are oriented axially or radially in the two proposed embodiments.

A different cavitation device is described in European Patent Document EP 1289638. In this device, an inlet port is arranged in axial direction on each side of the casing in order to equalize the hydraulic pressure on the rotor, and a port is provided. in the radial direction in the housing, in the cylindrical wall of the housing, in order to communicate with the cavitation zone in an intermediate zone of the rotor or between the sets of holes.

The position of the outlet port ensures that the entire volume of the gas / liquid mixture passes through at least one of the sets of holes and thus travels through the cavitation area before leaving the housing.

Also known is the mixing device of the publication of U.S. Pat. No. 2011 081 384, which describes the preamble of claim 1. This device has the inlet and outlet ports arranged tangentially with respect to the cavitation chamber.

The aforementioned cavitation devices have problems when treating abrasive fluids, such as biological fluids, manure, sewage, waste, mud or any other fluid that incorporates solid particles that can create friction.

In fact, with the cavitation devices of the prior art, the fluid must suddenly change its direction and speed when it enters and / or exits the housing chamber. This change in the direction and speed of the fluid leads to wear of the inlet and outlet ports.

In view of the aforementioned prior art, the object of the present invention is the provision of a cavitation device in which the direction and speed of the fluid entering and leaving the chamber of the casing are controlled, thereby avoiding Damage to the ports of entry and exit.

Compendium of the invention

According to the present invention, this objective is achieved by means of a cavitation device according to claim 1.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and advantages of the present invention will be presented from the following detailed description of a practical embodiment, which is provided by way of non-limiting example, with reference to the accompanying drawings, in which:

Figure 1 shows a top view of a cavitation device according to the present invention.

Figure 2 shows a sectional view of the cavitation device of Figure 1 along the section line A -A.

Figure 3 shows a front view of the cavitation device of figure 1.

Figure 4 shows an additional sectional view of the cavitation device of Figure 1 along the section line A -A.

Figure 5 shows a perspective view of the cavitation device of Figure 1.

Detailed description

Referring to the attached figures, figure 1 shows a cavitation device 10 coupled with an electric motor 1 for the definition of a cavitation apparatus 100.

The cavitation device 10 comprises an axis 11, a housing 20 and a rotor 30.

The shaft 11 extends along an axial direction X-X and is configured to be coupled with the electric motor 1. In particular, the electric motor 1 comprises a drive shaft 2 coupled with the axis 11 of the cavitation device 10 through a transmission means 3 to the object to rotate the axis 11.

The housing 20 defines a cylindrical chamber 21 having an inner cylindrical surface 21a and having a fluid inlet port 22 and a fluid outlet port 23.

Preferably, the housing 20 has a single fluid inlet 22 and a single fluid outlet 23.

The rotor 30 is disposed inside the cylindrical chamber 21 of the housing 20 and is mounted on the shaft 11 so as to rotate about a rotor axis X extending along the axial direction X-X.

A fluid inlet conduit 24 is coupled to the fluid inlet port 22 for fluid supply to the interior of the cylindrical chamber 21 of the housing 20. This fluid inlet conduit 24 has an input shaft B that is extends along an entry direction B - B.

A fluid outlet conduit 25 is coupled to the fluid outlet port 23 for receiving fluid from the cylindrical chamber 21 of the housing 20. This fluid outlet conduit 25 has an output shaft C that extends to along an exit direction C - C.

The housing 20 comprises a first side wall 26a and a second side wall 26b which is spaced apart in the axial direction from the first side wall 26a along the axial direction X-X.

The housing 20 further comprises a cylindrical body 27 extending in the axial direction between the first side wall 26a and the second side wall 26b and connecting the first and second side walls 26a, 26b. The cylindrical body 27 and the first and second side walls 26a, 26b define the cylindrical chamber 21 of the housing 20.

The rotor 30 comprises a first side surface 31 and a second side surface 32 which is spaced apart in the axial direction from the first side surface 31 along the axial direction X-X.

The rotor 30 further comprises a cylindrical peripheral surface 33 extending in the axial direction between the first side surface 31 and the second side surface 32 and connecting the first and second side surfaces 31, 32.

The radial distance between the rotor shaft X and the cylindrical peripheral surface 33 defines the rotor radius R of the rotor 30. The axial distance between the first lateral surface 31 and the second lateral surface 32 defines the axial extension of the rotor 30.

At least two sets of holes 34 are formed in the cylindrical peripheral surface 33. In the example shown in the figures, the rotor 30 comprises three sets of holes. The holes 34 of each set of holes are arranged in a row that extends around the cylindrical peripheral surface 33.

Each orifice 34 extends in the radial direction to the interior of the rotor 30 from the cylindrical peripheral surface 33.

A cavitation zone 35 is defined between the cylindrical peripheral surface 33 of the rotor 30 and the inner cylindrical surface 21a of the cylindrical chamber 21 of the housing 20.

The cylindrical chamber 21 comprises a cylindrical inlet chamber 28a formed between the first side surface 31 and the first side wall 26a and a cylindrical outlet chamber 28b formed between the second side surface 32 and the second side wall 26b.

The fluid inlet port 22 is located in the housing 20 for the purpose of introducing fluid into the cylindrical inlet chamber 28a in an axial position spaced from the first side surface 31 of the rotor 30.

The fluid outlet port 23 is located in the housing 20 for the purpose of receiving fluid from the cylindrical outlet chamber 28b in an axial position spaced from the second side surface 32 of the rotor 30. According to the invention, the axial distance between the fluid inlet port 22 and the first side surface 31 of the rotor 30 is equal to or greater than the axial extension of the rotor 30.

According to the invention, the axial distance between the fluid outlet port 23 and the second side surface 32 of the rotor 30 is equal to or greater than the axial extension of the rotor 30.

The input direction B - B of the input axis B is perpendicular to the axial direction X - X of the rotor axis X and the output direction C - C of the output shaft C is perpendicular to the axial direction X - X of the axis of rotor X.

Preferably, the fluid inlet conduit 24 and the fluid outlet conduit 25 are disposed in the stator 20, such that the fluid that is supplied through the fluid inlet port 22 and exits through the port of the fluid. Fluid outlet 23 follows, inside the cylindrical chamber 21, a helical path. The input shaft B and the output shaft C are substantially tangential to this helical path.

With this configuration of the input and output shafts B and C with respect to the rotor axis X and thanks to the axial position of the fluid inlet and outlet ports 22, 23, it is possible to control the tangential velocity of the fluid supplied to the inside the housing 20 and the one coming out of the housing 20, reducing all suction and supply effect.

The cylindrical inlet chamber 28a and the outlet cylindrical chamber 28b make two chambers available, such that, in operation, the fluid mass arranged in the axial direction before the rotor 30, in the cylindrical inlet chamber 28a, and after the rotor 30, in the cylindrical outlet chamber 28b, they guarantee a rotational inertia opposing the axial speed of the fluid, with respect to the radial and tangential speed fixed by the speed of the rotor 30.

As a consequence, the axial velocity of the fluid is independent of the speed of the rotor 30 and, therefore, cavitation is controlled.

This configuration is extremely advantageous with abrasive fluids, although it can also be advantageously used with non-abrasive fluids and for liquid-liquid, liquid-gas and solid liquid mixtures supplied through the fluid inlet conduit 24.

According to one embodiment, the inlet port 22 is located in the housing 20 for the purpose of introducing fluid into the cylindrical inlet chamber 28a in an axial position adjacent to the first side wall 26a of the housing 20 and the port outlet 23 is located in housing 20 for the purpose of receiving fluid from the cylindrical outlet chamber 28b in an axial position adjacent to the second side wall 26b of housing 20.

According to a preferred embodiment, the fluid inlet conduit 24 and the fluid outlet conduit 25 are located in such a way that the input shaft B and the output shaft C are parallel and are in a position close to the respective tangential directions to the cylindrical peripheral surface 33 of the rotor 30 or to the respective directions tangential to the inner cylindrical surface 21a of the cylindrical chamber 21 of the stator 20.

More preferably, the fluid inlet conduit 24 and the fluid outlet conduit 25 have respective first portions 24a, 25a facing a respective plane, in the example a same plane P ', which passes through the axis of the fluid. rotor X and which is parallel to the corresponding input axis B and output shaft C and opposite to second parts 24b, 25b. The second parts 24b, 25b of the fluid inlet conduit 24 and the fluid outlet conduit 25 are attached to the stator 20 in a direction substantially tangential to the inner cylindrical surface 21a of the cylindrical chamber 21 of the stator 20.

In the example shown in the figures, the input axis B and the output axis C are parallel.

According to one embodiment, the distance between the output axis C and the rotor axis X along a Y - Y direction perpendicular to the output axis C and the rotor axis X ranges from 70% to 100% of the radius of rotor R.

The same applies to the distance between the input axis B and the rotor axis X along a Y - Y direction perpendicular to the input axis C and to the rotor axis X, which ranges from 70% to 100% of the rotor radius R. In particular, the input shaft B and the output shaft C intersect a plane P which passes through the rotor axis X and which is perpendicular to the input and output axes B, C at a distance D from the rotor shaft X that ranges from 70% to 100% of the rotor radius R.

Preferably, the housing 20 comprises two lateral portions 20a, 20b defined on opposite sides with respect to the plane P passing through the rotor axis X and which is perpendicular to the input and output shafts B, C.

In the example shown in the figures, the fluid inlet port 22 and the fluid outlet port 23 are located in one of the two lateral parts 20a, 20b, specifically in the lateral part 20a.

Those skilled in the art will readily appreciate that a series of changes and variations can be made to the configurations described above in order to meet additional and specific requirements.

For example, unless somehow imposed by obvious technical limitations, any feature described in a preferred embodiment can obviously be used in another embodiment, with appropriate adaptations.

All changes will fall within the scope of the invention, as defined in the following claims.

Claims (11)

A cavitation device (10) comprising: - an axis (11) configured to be coupled with motor means (1), said axis (11) extending along an axial direction (X-X), - a casing (20) defining a cylindrical chamber (21) having an inner cylindrical surface (21a), said casing having a fluid inlet port (22) and a fluid outlet port (23), - a rotor (30) disposed inside said cylindrical chamber (21) of said housing (20) and mounted on said shaft (11) in order to rotate about a rotor axis (X) extending along of said axial direction (X-X), - a fluid inlet conduit (24) coupled with said fluid inlet port (22) for the supply of fluid to said cylindrical chamber (21), said conduit fluid inlet (24) an input shaft (B) extending along an input direction (B - B), - a fluid outlet conduit (25) coupled with said fluid outlet port (23) for receiving fluid from said cylindrical chamber (21), said fluid outlet conduit (23) having an output shaft ( C) that extends along an exit direction (C - C), in which: - said casing (20) comprises: - a first side wall (26a) and a second side wall (26b) which is separated in the axial direction from said first side wall (26a), - a cylindrical body (27) extending in axial direction between said first and second side walls (26a, 26b) and joining said first and second side walls (26a, 26b), - said rotor (30) comprises: - a first side surface (31) and a second side surface (32) that is spaced in the axial direction from said first side surface (31), - a cylindrical peripheral surface (33) extending in the axial direction between said first and second lateral surfaces (31, 32) and connecting said first and second lateral surfaces (31, 32), - at least two sets of holes (34) that are formed in said cylindrical peripheral surface (33), the orifices (34) of each set of holes being arranged in a row extending around said cylindrical peripheral surface (33), each orifice (33) extending radially into said rotor (30) from said cylindrical peripheral surface (33), - said cylindrical chamber (21) comprises a cylindrical inlet chamber (28a) formed between said first lateral surface (31) and said first side wall (26a) and a cylindrical outlet chamber (28b) formed between said second lateral surface (32) ) and said second side wall (26b), - a cavitation zone (35) defined between said cylindrical peripheral surface (33) of the rotor (30) and said inner cylindrical surface (21a) of the cylindrical chamber (21) of the casing (20), and in which: - said input direction (B-B) of said input shaft (B) is perpendicular to said axial direction (X-X) of said rotor axis (X), - said output direction (C-C) of said output shaft (C) is perpendicular to said axial direction (X-X) of said rotor axis (X), - said inlet port (22) is located in said casing (20) for the purpose of introducing fluid into said cylindrical inlet chamber (28a) in an axial position spaced from said first lateral surface (31) of the rotor (30), - said outlet port (23) is located in said housing (20) for the purpose of receiving fluid from said cylindrical outlet chamber (28b) in an axial position spaced from said second lateral surface (32) of the rotor (30). ), characterized in that: - the axial distance between the fluid inlet port (22) and the first side surface (31) of the rotor (30) is equal to or greater than the axial distance between the first side surface (31) and the second side surface (32) ) of the rotor (30); and - the axial distance between the fluid outlet port (23) and the second side surface (32) of the rotor (30) is equal to or greater than the axial distance between the first side surface (31) and the second side surface ( 32) of the rotor (30). 2. The cavitation device (10) according to claim 1, wherein: - said inlet port (22) is located in said housing (20) for the purpose of introducing fluid into said cylindrical inlet chamber (28a) in an axial position adjacent to said first side wall (26a) of the housing (20), - said outlet port (23) is located in said housing (23) for the purpose of receiving fluid from said cylindrical outlet chamber (28b) in an axial position adjacent to said second side wall (26b) of the housing ( twenty). 3. The cavitation device (10) according to claim 1 or 2, wherein: - said fluid inlet conduit (24) and said fluid outlet conduit (25) are disposed in the stator (20) in such a way that the fluid that is supplied through said fluid inlet port (22) and which exits through said fluid outlet port (23) follows, inside the cylindrical chamber (21), a helical path. 4. The cavitation device (10) according to claim 3, wherein: - said input shaft (B) and said output shaft (C) are substantially tangential to said helical path. 5. The cavitation device (10) according to any of claims 1 to 4, wherein: - said fluid inlet conduit (24) and said fluid outlet conduit (25) are located in such a way that said inlet axis (B) and said outlet axis (C) are parallel and are close to the respective directions tangential to said cylindrical peripheral surface (33) of the rotor (30). The cavitation device (10) according to any of claims 1 to 5, wherein: - said fluid inlet conduit (24) and said fluid outlet conduit (25) are located in such a way that said inlet axis (B) and said outlet axis (C) are parallel and are close to the respective directions tangential to said inner cylindrical surface (21a) of the cylindrical chamber (21) of the housing (20). The cavitation device (10) according to any of claims 1 to 6, wherein: - said fluid inlet conduit (24) and said fluid outlet conduit (25) have respective first portions (24a, 25a) that face a respective plane passing through said rotor axis (X) and which is parallel to the corresponding input shaft (B) and output shaft (C) and opposite a second parts (24b, 25b), - said second parts (24b, 25b) of the fluid inlet conduit (24) and of the fluid outlet conduit (25) are attached to the stator (20) in a direction substantially tangential to the inner cylindrical surface (21a) of the cylindrical chamber (21) of the stator (20). The cavitation device (10) according to any of claims 1 to 7, wherein: - the distance (D) between the output shaft (C) and the rotor axis (X) along a direction (Y - Y) perpendicular to said output shaft (C) and to said rotor axis (X) ranges from 70% to 100% of the radial distance (R) between said rotor shaft (X) and said cylindrical peripheral surface (33) of the rotor (30). The cavitation device (10) according to any of claims 1 to 8, wherein: - the distance (D) between the input shaft (B) and the rotor axis (X) along one direction (Y - Y) perpendicular to said input axis (B) and said rotor axis (X) ranges from 70% to 100% of the radial distance (R) between said rotor shaft (X) and said cylindrical peripheral surface (33) of the rotor (30). The cavitation device (10) according to any of claims 1 to 9, wherein: - said input axis (B) intersects a plane (P) that passes through said rotor axis (X) and that is perpendicular to said input and output axes (B, C) at a distance (D) from said rotor shaft (X) that ranges between 70% and 100% of the radial distance (R) between said rotor shaft (X) and said cylindrical peripheral surface (33) of the rotor (30). The cavitation device (10) according to any of claims 1 to 10, wherein: - said output shaft (C) intersects a plane (P) that passes through said rotor axis (X) and that is perpendicular to said input and output axes (B, C) at a distance (D) from said rotor shaft (X) that ranges between 70% and 100% of the radial distance (R) between said rotor shaft (X) and said cylindrical peripheral surface (33) of the rotor (30).