WO2016117709A1 - Centrifugal impeller for fluid-operated pumps, and method for manufacturing the impeller - Google Patents

Centrifugal impeller for fluid-operated pumps, and method for manufacturing the impeller Download PDF

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Publication number
WO2016117709A1
WO2016117709A1 PCT/JP2016/051948 JP2016051948W WO2016117709A1 WO 2016117709 A1 WO2016117709 A1 WO 2016117709A1 JP 2016051948 W JP2016051948 W JP 2016051948W WO 2016117709 A1 WO2016117709 A1 WO 2016117709A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
disk
vanes
shaped body
impeller portion
Prior art date
Application number
PCT/JP2016/051948
Other languages
French (fr)
Inventor
Andrea Cirolini
Mauro Maule
Marco ARMIENTO
Original Assignee
Ebara Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebara Corporation filed Critical Ebara Corporation
Priority to EP16740316.1A priority Critical patent/EP3247910A4/en
Priority to CN201680005797.1A priority patent/CN107110173A/en
Priority to JP2017537515A priority patent/JP2018503024A/en
Priority to BR112017015302A priority patent/BR112017015302A2/en
Publication of WO2016117709A1 publication Critical patent/WO2016117709A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F04D29/2227—Construction and assembly for special materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
    • B29C65/7814—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of inter-cooperating positioning features, e.g. tenons and mortises
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/301—Three-dimensional joints, i.e. the joined area being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/748—Machines or parts thereof not otherwise provided for
    • B29L2031/7496—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the present invention relates to a centrifugal impeller, particularly for fluid- operated pumps, and to a method for manufacturing the impeller.
  • a centrifugal impeller is generally composed of pairs of shaped disk- shaped bodies facing each other so as to form an interspace within which there are vanes which define a corresponding number of channels and rigidly connect the two disk-shaped bodies.
  • the impeller is also provided with a hub, or equivalent coupling devices, that allow to connect the impeller to a transmission shaft of a pump or of other machines.
  • Polymeric materials in fact have characteristics that by now are similar, if not better, in many cases, than those of metals.
  • One component generally includes the part for connection to the driving shaft and the vanes for moving the liquid while the other component consists of a sort of disk that is conceived to close the impeller and create the vane channels inside which the liquid moves.
  • the parts has surfaces that are arranged in an undercut configuration with respect to the opening movement of the mold, the volumes that are arranged in undercut are obtained by means of movable parts, known as carriages, which are actuated by the motion of the press.
  • the impeller is composed of a large number of vanes, or has a complex geometry
  • the division of the parts that is commonly adopted by manufacturers entails that it is impossible to mold it with injection molding techniques or entails a complexity of the mold that increases its cost considerably.
  • the aim of this invention is to solve the problems described above, providing a centrifugal impeller, particularly for fluid-operated pumps, and a method for the manufacture of said impeller, which allow to utilize in the best possible way the properties of polymeric materials and simultaneously to not neglect the impact of the geometry of the components on the execution of the molds and on molding.
  • a particular object of the invention is to devise an impeller and a corresponding manufacturing method such as to reduce the complexity of the injection molds that are required and accordingly their cost.
  • Another object of the invention is to provide an impeller and a corresponding production method that allow to solve the problem of the phasing of the various components.
  • Another object of the invention is to provide an impeller and a corresponding manufacturing method that are highly reliable and cheap.
  • a centrifugal impeller for fluid-operated pumps comprising a first disk- shaped body and a second disk-shaped body, which are coaxial and mutually opposite so as to form an interspace within which multiple radial vanes are arranged; said impeller being centrally provided with means for coupling to a transmission shaft; said impeller being characterized in that it comprises a first impeller portion and a second impeller portion, which are mutually engaged; said first impeller portion comprising said first disk- shaped body and a part of said vanes; said second impeller portion comprising said second disk-shaped body and the remaining part of said vanes.
  • first impeller portion comprising a first disk-shaped body provided with a part of the vanes with which said impeller is equipped and centrally provided with a hub to be mechanically associated with a transmission shaft;
  • Figure 1 is a top view of an impeller according to the invention, obtained by means of the method according to the invention;
  • Figure 2 is a sectional view taken along the plane ll-ll of Figure 1 ;
  • FIG. 3 is a top view of an impeller portion according to the invention, obtained by means of the method according to the invention;
  • Figure 4 is a sectional view taken along the plane IV-IV of Figure 3;
  • Figure 5 is a bottom view of the impeller portion of Figure 3;
  • FIG. 6 is a perspective view of another impeller portion according to the invention, obtained by means of the method according to the invention.
  • Figure 7 is a bottom view of the impeller portion of Figure 6;
  • Figure 8 is a sectional view taken along the plane VIII-VIII of Figure 7.
  • centrifugal impeller particularly for fluid- operated pumps, is designated generally by the reference numeral 1.
  • the impeller 1 is formed by a first impeller portion 10 and by a second impeller portion 20, which are mutually engaged.
  • the first impeller portion 10 comprises a first shaped disk-shaped body 1 1 having a plurality of first vanes 12.
  • the first vanes 12 are arranged radially around the axis of symmetry of the impeller portion 10 and constitute only a part of the vanes that are present as a whole on the impeller 1. In this embodiment of the invention, the first vanes 12 correspond to half of the vanes that are present on the impeller 1 , which therefore necessarily has an even number of vanes.
  • a hub 13 or an equivalent coupling device which is conceived so as to be mechanically associable with a transmission shaft, not shown in the figures.
  • the second impeller portion 20 comprises a second disk-shaped body
  • the second vanes 22 constitute the remaining part of the vanes that are present as a whole on the impeller 1.
  • the second vanes 22 correspond to the other half of the vanes of the impeller 1.
  • half of the vanes of the impeller 1 extend from the first disk-shaped body 11 and the other half of the vanes extends from the second element 20.
  • the second impeller portion 20 is provided with a through hole 23 that is formed centrally with respect to the second disk-shaped body 21.
  • the through hole 23 has a larger cross-section than the transmission shaft and forms the intake of the impeller 1.
  • the second impeller portion 20 is coaxial and opposite with respect to the first impeller portion 10, so that the vanes 22 and 12 are angularly distributed around the axis of symmetry of the impeller 1 in order to define a plurality of radially extended channels comprised between the first disk-shaped body 11 and the second disk-shaped body 21.
  • the vanes 12 are alternated evenly with the vanes 22 in order to form said channels.
  • the correct placement of the second impeller portion 20 with respect to the first impeller portion 10 is ensured by adapted phasing means that allow to give uniform dimensions to the channels.
  • the phasing means are constituted by protrusions 14 that protrude from the vanes 12 in order to interlock in a corresponding number of seats 24 formed on the second disk-shaped body 21.
  • the two impeller portions 10 and 20 are made of thermoplastic material and are mutually engaged by means of welding spots created by means of an ultrasonic beam.
  • the welding joints are provided at the contact points between the vanes 12 and the second disk-shaped body 21 and at the contact points between the vanes 22 and the first disk-shaped element 11.
  • vanes 12 and 22 are provided respectively with protrusions 15 and 25 formed at the edges intended for welding.
  • the protrusions 15 and 25 allow to concentrate the energy transmitted by the ultrasonic beam substantially at the welding joints.
  • the two impeller portions 10 and 20 are mutually engaged by virtue of chemical fixing means, such as for example adhesives or polymeric resins with high adhesive characteristics.
  • the two impeller portions 10 and 20 are mutually engaged by virtue of anchoring systems of the mechanical type, such as for example screws, rivets, or others.
  • a method for manufacturing a centrifugal impeller is also provided.
  • the method according to the invention is advantageously used to manufacture the above described impeller, but it can also be used for manufacturing impellers having a different structure as well as for different uses.
  • the method according to the invention comprises forming a first impeller portion 10 and a second impeller portion 20, preferably by molding, for example injection molding, and subsequently joining the two impeller portions together.
  • the first impeller portion 10 comprises a first disk-shaped body 11 having vanes 12 and centrally provided with a hub 13 that can be associated mechanically with a transmission shaft.
  • the number of vanes 12 corresponds to half the number of plays that are present as a whole on the impeller 1.
  • the second impeller portion 20 comprises a second disk-shaped body 21 having vanes 22 and centrally provided with a through hole 13 whose diameter is larger in diameter than the transmission shaft.
  • the number of the vanes 22 corresponds to half of the number of the vanes that are present as a whole on the impeller 1.
  • the two impeller portions 10 and 20 thus formed are then mutually engaged, preferably by ultrasonic welding.
  • the welding operations begin by arranging the two impeller portions 10 and 20 so that the first impeller portion 10 is coaxial and opposite with respect to the second impeller portion 20.
  • the free edges of the vanes 12 are then arranged adjacent and so as to mate with the second disk-shaped body 21 ; the free edges of the vanes 22 are arranged adjacent and so as to mate with the first disk-shaped body 11.
  • the correct phasing of the two impeller portions 10 and 20 during welding is ensured by forming, on one impeller portion, adapted protrusion 14 that interlock in as many corresponding seats 24 provided on the other impeller portion.
  • impeller and the method according to the invention allow to utilize, in the best possible way, the properties of polymeric materials and simultaneously to not neglect the impact of the geometry of the components on the execution of the molds and on molding.
  • This method also allows to solve any phasing problems that might occur, by adopting the solution described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A centrifugal impeller, particularly for fluid-operated pumps, comprising a first disk- shaped body and a second disk-shaped body, which are coaxial and mutually opposite so as to form an interspace within which multiple radial vanes are arranged; the impeller is centrally provided with means for coupling to a transmission shaft. The impeller has a first impeller portion and a second impeller portion, which are mutually engaged; the first impeller portion comprises the first disk-shaped body and a part of the vanes, while the second impeller portion comprises the second disk-shaped body and the remaining part of said vanes. The present invention also relates to a method for manufacturing a centrifugal impeller, particularly for fluid-operated pumps.

Description

DESCRIPTION
Title of the Invention
CENTRIFUGAL IMPELLER FOR FLUID-OPERATED PUMPS, AND METHOD FOR MANUFACTURING THE IMPELLER
Technical Field
The present invention relates to a centrifugal impeller, particularly for fluid- operated pumps, and to a method for manufacturing the impeller.
Background Art
As is known, a centrifugal impeller is generally composed of pairs of shaped disk- shaped bodies facing each other so as to form an interspace within which there are vanes which define a corresponding number of channels and rigidly connect the two disk-shaped bodies.
The impeller is also provided with a hub, or equivalent coupling devices, that allow to connect the impeller to a transmission shaft of a pump or of other machines.
In recent years, many manufacturers are manufacturing impellers completely made of plastic because of their ease of manufacture, low production costs, lower weight of the components and the absence of oxidation.
Polymeric materials in fact have characteristics that by now are similar, if not better, in many cases, than those of metals.
Summary of the Invention
Technical Problem
However, in order to exploit, in the best possible way, the possibilities offered by plastics and by their transformation techniques, it is necessary to design the components by following rules that differ from those of traditional mechanics.
In this regard, one should consider for example that the workability of plastics allows to more effectively design the shape of the impellers, but very often this entails a greater complexity in production. Currently, the solution that is most adopted by manufacturers in the design of hydraulic impellers made of injection-molded plastic material entails the provision of two components which are subsequently mutually assembled, normally by ultrasonic welding.
One component generally includes the part for connection to the driving shaft and the vanes for moving the liquid while the other component consists of a sort of disk that is conceived to close the impeller and create the vane channels inside which the liquid moves.
Although this construction technology may seem apparently simple, one must consider that injection molding entails the use of molds constituted by two parts which, at the end of the process, must be opened in order to allow the extraction of the finished part.
If the part has surfaces that are arranged in an undercut configuration with respect to the opening movement of the mold, the volumes that are arranged in undercut are obtained by means of movable parts, known as carriages, which are actuated by the motion of the press.
The more the parts arranged in an undercut configuration have a complex geometry, the more the motion of the carriages are complicated, requiring nonlinear or composite movements.
Accordingly, if the impeller is composed of a large number of vanes, or has a complex geometry, the division of the parts that is commonly adopted by manufacturers entails that it is impossible to mold it with injection molding techniques or entails a complexity of the mold that increases its cost considerably.
Advantageous Effects of the Invention
The aim of this invention is to solve the problems described above, providing a centrifugal impeller, particularly for fluid-operated pumps, and a method for the manufacture of said impeller, which allow to utilize in the best possible way the properties of polymeric materials and simultaneously to not neglect the impact of the geometry of the components on the execution of the molds and on molding. Within the scope of this aim, a particular object of the invention is to devise an impeller and a corresponding manufacturing method such as to reduce the complexity of the injection molds that are required and accordingly their cost.
Another object of the invention is to provide an impeller and a corresponding production method that allow to solve the problem of the phasing of the various components.
Another object of the invention is to provide an impeller and a corresponding manufacturing method that are highly reliable and cheap.
Solution to the Problem
This aim, these objects and others that will become better apparent hereinafter are achieved by a centrifugal impeller for fluid-operated pumps, comprising a first disk- shaped body and a second disk-shaped body, which are coaxial and mutually opposite so as to form an interspace within which multiple radial vanes are arranged; said impeller being centrally provided with means for coupling to a transmission shaft; said impeller being characterized in that it comprises a first impeller portion and a second impeller portion, which are mutually engaged; said first impeller portion comprising said first disk- shaped body and a part of said vanes; said second impeller portion comprising said second disk-shaped body and the remaining part of said vanes.
This aim and these objects are also achieved by a method for manufacturing a centrifugal impeller, particularly for fluid-operated pumps, characterized in that it comprises the following steps:
- providing a first impeller portion comprising a first disk-shaped body provided with a part of the vanes with which said impeller is equipped and centrally provided with a hub to be mechanically associated with a transmission shaft;
- providing a second impeller portion comprising a second disk-shaped body provided with the remaining part of the vanes with which said impeller is equipped and centrally provided with a through hole;
- mutually engaging said first impeller portion and said second impeller portion, arranging said first disk-shaped body coaxially opposite with respect to said second disk- shaped body and combining the vanes associated with said first disk-shaped body with the vanes associated with said second disk-shaped body, so that said vanes are angularly distributed around the axis of symmetry of said impeller.
Brief Description of the Drawings
Further characteristics and advantages will become better apparent from the description of preferred but not exclusive embodiments of a centrifugal impeller, particularly for fluid -operated pumps, according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
Figure 1 is a top view of an impeller according to the invention, obtained by means of the method according to the invention;
Figure 2 is a sectional view taken along the plane ll-ll of Figure 1 ;
Figure 3 is a top view of an impeller portion according to the invention, obtained by means of the method according to the invention;
Figure 4 is a sectional view taken along the plane IV-IV of Figure 3;
Figure 5 is a bottom view of the impeller portion of Figure 3;
Figure 6 is a perspective view of another impeller portion according to the invention, obtained by means of the method according to the invention;
Figure 7 is a bottom view of the impeller portion of Figure 6;
Figure 8 is a sectional view taken along the plane VIII-VIII of Figure 7.
Description of the Embodiments
With reference to the cited figures, a centrifugal impeller, particularly for fluid- operated pumps, is designated generally by the reference numeral 1.
According to the present invention, the impeller 1 is formed by a first impeller portion 10 and by a second impeller portion 20, which are mutually engaged. The first impeller portion 10 comprises a first shaped disk-shaped body 1 1 having a plurality of first vanes 12.
The first vanes 12 are arranged radially around the axis of symmetry of the impeller portion 10 and constitute only a part of the vanes that are present as a whole on the impeller 1. In this embodiment of the invention, the first vanes 12 correspond to half of the vanes that are present on the impeller 1 , which therefore necessarily has an even number of vanes.
However, it is evident to the person skilled in the art that other embodiments of the invention may have a different distribution of the vanes between the two impeller portions 10 and 20.
Advantageously, at the center of the first disk-shaped body 1 1 there is a hub 13 or an equivalent coupling device, which is conceived so as to be mechanically associable with a transmission shaft, not shown in the figures.
Likewise, the second impeller portion 20 comprises a second disk-shaped body
21 having a plurality of second vanes 22 arranged radially around the axis of symmetry of said impeller portion protrudes.
The second vanes 22 constitute the remaining part of the vanes that are present as a whole on the impeller 1.
In this embodiment, the second vanes 22 correspond to the other half of the vanes of the impeller 1.
In other words, in the illustrated example, half of the vanes of the impeller 1 extend from the first disk-shaped body 11 and the other half of the vanes extends from the second element 20.
In this regard, it is very important to point out that the choice of arranging half of the vanes on the first impeller portion 10 and the other half of the vanes on the second impeller portion 20 causes the vanes, on each impeller portion, to be located, during production, at a distance that is twice the distance at which they are located when the two impeller portions 10 and 20 mutually engage so as to constitute the impeller 1.
Also, the second impeller portion 20 is provided with a through hole 23 that is formed centrally with respect to the second disk-shaped body 21.
Conveniently, the through hole 23 has a larger cross-section than the transmission shaft and forms the intake of the impeller 1.
In the impeller 1 , the second impeller portion 20 is coaxial and opposite with respect to the first impeller portion 10, so that the vanes 22 and 12 are angularly distributed around the axis of symmetry of the impeller 1 in order to define a plurality of radially extended channels comprised between the first disk-shaped body 11 and the second disk-shaped body 21.
In the illustrated example, when the two impeller portions 10 and 20 are mutually engaged, the vanes 12 are alternated evenly with the vanes 22 in order to form said channels.
The correct placement of the second impeller portion 20 with respect to the first impeller portion 10 is ensured by adapted phasing means that allow to give uniform dimensions to the channels.
In the illustrated example, the phasing means are constituted by protrusions 14 that protrude from the vanes 12 in order to interlock in a corresponding number of seats 24 formed on the second disk-shaped body 21.
According to a preferred but not exclusive embodiment, the two impeller portions 10 and 20 are made of thermoplastic material and are mutually engaged by means of welding spots created by means of an ultrasonic beam.
Conveniently, the welding joints are provided at the contact points between the vanes 12 and the second disk-shaped body 21 and at the contact points between the vanes 22 and the first disk-shaped element 11.
In this regard, it should be noted that the vanes 12 and 22 are provided respectively with protrusions 15 and 25 formed at the edges intended for welding.
Advantageously, the protrusions 15 and 25 allow to concentrate the energy transmitted by the ultrasonic beam substantially at the welding joints.
According to a further embodiment, not shown in the figures, the two impeller portions 10 and 20 are mutually engaged by virtue of chemical fixing means, such as for example adhesives or polymeric resins with high adhesive characteristics.
According to a further embodiment, not shown in the figures, the two impeller portions 10 and 20 are mutually engaged by virtue of anchoring systems of the mechanical type, such as for example screws, rivets, or others.
According to the present invention, a method for manufacturing a centrifugal impeller, particularly for fluid-operated pumps, is also provided. The method according to the invention is advantageously used to manufacture the above described impeller, but it can also be used for manufacturing impellers having a different structure as well as for different uses.
The method according to the invention comprises forming a first impeller portion 10 and a second impeller portion 20, preferably by molding, for example injection molding, and subsequently joining the two impeller portions together.
The first impeller portion 10 comprises a first disk-shaped body 11 having vanes 12 and centrally provided with a hub 13 that can be associated mechanically with a transmission shaft.
In the example shown, the number of vanes 12 corresponds to half the number of plays that are present as a whole on the impeller 1.
Likewise, the second impeller portion 20 comprises a second disk-shaped body 21 having vanes 22 and centrally provided with a through hole 13 whose diameter is larger in diameter than the transmission shaft.
In the example shown, the number of the vanes 22 corresponds to half of the number of the vanes that are present as a whole on the impeller 1.
The two impeller portions 10 and 20 thus formed are then mutually engaged, preferably by ultrasonic welding.
The welding operations begin by arranging the two impeller portions 10 and 20 so that the first impeller portion 10 is coaxial and opposite with respect to the second impeller portion 20.
The free edges of the vanes 12 are then arranged adjacent and so as to mate with the second disk-shaped body 21 ; the free edges of the vanes 22 are arranged adjacent and so as to mate with the first disk-shaped body 11.
Advantageously, the correct phasing of the two impeller portions 10 and 20 during welding is ensured by forming, on one impeller portion, adapted protrusion 14 that interlock in as many corresponding seats 24 provided on the other impeller portion.
At this point, by means of a sonotrode, i.e., a sound wave emitter, an ultrasonic beam is transmitted to at least one of the impeller portions 10 and 20 simultaneously with application of a normal pressure. In practice it has been found that the centrifugal impeller, particularly for fluid- operated pumps, and the method for the production of said impeller, according to the invention, fully achieve the intended aim and objects.
In particular, it is evident that the impeller and the method according to the invention allow to utilize, in the best possible way, the properties of polymeric materials and simultaneously to not neglect the impact of the geometry of the components on the execution of the molds and on molding.
In this regard, one should consider that the fact that half of the vanes are arranged on a first impeller portion and the other half of the vanes are arranged on a second impeller portion causes the vanes on each impeller portion to be located, during production, at twice the distance at which they are in the finished impeller.
This leads to a reduced complexity of the injection molding molds and accordingly to a lower cost also of the finished product.
This method also allows to solve any phasing problems that might occur, by adopting the solution described above.

Claims

1. A centrifugal impeller for fluid-operated pumps, comprising a first disk-shaped body and a second disk-shaped body, which are coaxial and mutually opposite so as to form an interspace within which multiple radial vanes are arranged; said impeller being centrally provided with means for coupling to a transmission shaft; said impeller being characterized in that it comprises a first impeller portion and a second impeller portion, which are mutually engaged; said first impeller portion comprising said first disk-shaped body and a part of said vanes; said second impeller portion comprising said second disk- shaped body and the remaining part of said vanes.
2. The impeller according to the claim 1 , characterized in that the vanes that extend from said first disk-shaped body combine with the vanes that extend from said second disk-shaped body, so that said vanes are angularly distributed around the axis of symmetry of said impeller.
3. The impeller according to claim 1 , characterized in that said impeller portions comprise phasing means.
4. The impeller according to claim 3, characterized in that said phasing means comprises two or more protrusions formed on an impeller portion and adapted to interlock in as many corresponding seats formed on the other impeller portion.
5. The impeller according to claim 1 , characterized in that said first impeller portion is associated with said second impeller portion by means of welded joints created by means of an ultrasonic beam.
6. The impeller according to claim 5, characterized in that said vanes comprise protrusions adapted to concentrate the energy transmitted by said ultrasonic beam substantially at said welding joints.
7. The impeller according to claim 1 , characterized in that said first impeller portion is associated with said second impeller portion by chemical fastening means.
8. The impeller according to claim 1 , characterized in that said first impeller portion is associated with said second impeller portion by mechanical fastening means.
9. The impeller according to claim 1 , characterized in that said means for coupling to a transmission shaft comprises a hub to be mechanically associated with said transmission shaft and a through hole with a diameter that is larger than the diameter of said transmission shaft; said hub being formed on said first disk-shaped body; said through hole being formed in said second disk-shaped body.
10. A method for manufacturing a centrifugal impeller, particularly for fluid- operated pumps, characterized in that it comprises the following steps:
- providing a first impeller portion comprising a first disk-shaped body provided with a part of the vanes with which said impeller is equipped and centrally provided with a hub to be mechanically associated with a transmission shaft;
- providing a second impeller portion comprising a second disk-shaped body provided with the remaining part of the vanes with which said impeller is equipped and centrally provided with a through hole;
- mutually engaging said first impeller portion and said second impeller portion, arranging said first disk-shaped body coaxially opposite with respect to said second disk-shaped body and combining the vanes associated with said first disk-shaped body with the vanes associated with said second disk-shaped body, so that said vanes are angularly distributed around the axis of symmetry of said impeller.
11. The method according to claim 10, characterized in that said step of mutually engaging said first impeller portion and said second impeller portion comprises forming welding joints by means of an ultrasonic beam.
12. The method according to claim 10, characterized in that said step of mutually engaging said first impeller portion and said second impeller portion comprises phasing said impeller portions by means of two or more protrusions formed on an impeller portion and adapted to interlock in as many corresponding seats formed on the other impeller portion.
PCT/JP2016/051948 2015-01-19 2016-01-18 Centrifugal impeller for fluid-operated pumps, and method for manufacturing the impeller WO2016117709A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP16740316.1A EP3247910A4 (en) 2015-01-19 2016-01-18 Centrifugal impeller for fluid-operated pumps, and method for manufacturing the impeller
CN201680005797.1A CN107110173A (en) 2015-01-19 2016-01-18 Centrifugal impeller and the method that manufactures the impeller for hydraulic pump
JP2017537515A JP2018503024A (en) 2015-01-19 2016-01-18 Centrifugal impeller for fluid-operated pump and manufacturing method of impeller
BR112017015302A BR112017015302A2 (en) 2015-01-19 2016-01-18 centrifugal impeller for fluid-operated pumps, and method for manufacturing impeller

Applications Claiming Priority (2)

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IT102015902322334 2015-01-19
ITVI20150012 2015-01-19

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JP2018503024A (en) 2018-02-01
BR112017015302A2 (en) 2018-01-09
EP3247910A4 (en) 2018-09-19
TW201640027A (en) 2016-11-16
CN107110173A (en) 2017-08-29
EP3247910A1 (en) 2017-11-29

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