GB2134191A - A pump rotor - Google Patents

A pump rotor Download PDF

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Publication number
GB2134191A
GB2134191A GB08333434A GB8333434A GB2134191A GB 2134191 A GB2134191 A GB 2134191A GB 08333434 A GB08333434 A GB 08333434A GB 8333434 A GB8333434 A GB 8333434A GB 2134191 A GB2134191 A GB 2134191A
Authority
GB
United Kingdom
Prior art keywords
drive sleeve
pump
blade wheel
pump shaft
ofthe
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08333434A
Other versions
GB8333434D0 (en
GB2134191B (en
Inventor
Franz Sapper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
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 Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of GB8333434D0 publication Critical patent/GB8333434D0/en
Publication of GB2134191A publication Critical patent/GB2134191A/en
Application granted granted Critical
Publication of GB2134191B publication Critical patent/GB2134191B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

A pump rotor comprises a pump shaft (3), a drive sleeve (2) mounted on the pump shaft (3) by splines and an elastically flexible blade wheel (1) made of vulcanised material bonded to the drive sleeve (2). The blade wheel (1) extends axially beyond the drive sleeve (2) at one end and is provided at this end with a radially inwardly extending encircling seal (4) which seals against the peripheral surface of the pump shaft (3). <IMAGE>

Description

SPECIFICATION A pump rotor This invention relates to a pump rotor ofthe kind comprising a pump shaft, a drive sleeve mounted on the pump shaft and an efasticallyflexible bladewheel madeofavulcanised material bonded to, e.g.
vulcanised-on to, the drive sleeve.
Pump rotors of the kind referred to are frequently used in sturdy self-priming pumps for everyday requirements. However, known pump rotors ofthe kind referred to suffer from the practical disadvantage thattheconnection oftheelasticallyflexible blade wheel or impellerto the drive sleeve frequently becomes loose in use.
An aim ofthe present invention is to eliminate the above-mentioned disadvantage as far as possible by providing a pump rotor in which the blade wheel remains firmly bonded in use to the drive sleeve even when aggressive, e.g. corrosive, media, such as, for example, caustic soda or P3 solutions, are conveyed bythe pump rotor.
According to the invention a pump rotor of the kind referred to is characterised in thatthe blade wheel extends beyond the drive sleeve in a first axial direction, said axially extending portion of the blade wheel having a radially inwardly directed encircling seal means arranged to seal againstthe peripheral surface of the pump shaft.
The proposed design of a pump rotoraccordingto the invention is based on the finding that, in contrast tothemetallicmaterial ofthe drive sleeve and in contrast to the elastically flexible material ofthe blade wheel, the adhesive auxiliaries, used for connecting the two parts to one another (e.g. byvulcanisation), react, in many cases, in an extremely sensitive manner to stress from aggressive or corrosive liquids. Even a technically perfect bond provided in a pump rotor can consequently be destroyed after being stressed by the relevant solvents for a relativelyshorttime, and this is undesirable.Accordingly, in the proposed pump rotor according to the invention, the blade wheel, which consists of an elastically flexible material, projects beyond the drive sleeve in an axial direction and has, in the region ofthe projection formed in this way, an encircling bead which projects inwards in a radial direction and which rests againstthe pump shaft under an elastic prestress, making a seal.
The profile of the seal or bead is preferably semi-circular, corresponding to the shape of a conventional O-ring. The bead or seal is appropriately spaced, in an axial direction, from any pump shaft connecting means, e.g. splines, onthedriveshaftfor assisting connection of the drive sleeve thereto. In this case the bead or seal is preferablyannularto match the circular cylindrical periphery ofthe pump shaft.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawing the sole figure of which is a schematic axial sectional view of a pump rotor.
Thefigureshowsa pump rotor comprising an impeller or blade wheel 1 mounted via a brass drive sleeve 2 to a pump shaft 3. The blade wheel 1 has eight radially and axially extending blades.The radially outer extremity of each blade isthickened and is in the form of a bead extending parallel to the axis of rotation ofthe pump rotor and having a substantially circular profile. The blade wheel 1 is made of rubber with a Shore A hardness of 72 and is bonded, preferably by vulcanisation to the brass drive sleeve which serves to transmit the rotary movement from the pump shaft 3 to the blade wheel 1.Forthis purpose, the pump shaft 3 and the drive sleeve 2 have, in the region of their confronting surfaces, splined profiles 5which match one another (i.e. interengage or interfitwith each other when the drive sleeve 2 is push fitted onto the splined end of the pump shaft 3) and which extend parallel to the axis of rotation of the pump rotor.
The rubber body forming the blade wheel projects or extends axially beyond both ends ofthe drive sleeve 2. The left-hand end (as viewed in the figure) of the blade wheel 1 is closed and completely covers the tubular end of the drive sleeve 2 with the result that secondary substances are prevented from penetrating from this direction into the connecting zone between the drive sleeve and the blade wheel during use ofthe pump rotor.
The right-hand end portion (as viewed in the figure) which extends axially beyond the drive sleeve is provided with a radially inwardly extending encircling, preferably annular, bead or seal 4 (typically of semi-circular cross-section) which rests in a statically sealing manner againstthe preferably circular cylindrical periphery ofthe pump shaft. The seal 4 is urged in a resilient manner againstthe periphery of the pump shaft and thus, in use, prevents conveyed medium from reaching the critical connecting zone between the drive sleeve 2 and the blade wheel 1.
1. A pump rotor comprising a pump shaft, a drive sleeve mounted on the pump shaft and an elastically flexible blade wheel madeofavulcanised material bonded to the drive sleeve, wherein a portion of the blade wheel extends beyond the drive sleeve in a first axial direction, said axially extending portion of the blade wheel having a radially inwardly directed encircling seal means arranged to seal againstthe peripheral surfaceofthe pump shaft.
2. A pump rotor according to claim 1, in which the blade wheel is bonded to the drive sleeve by vulcinisation.
3. A pump rotor according to claim 1 or 2, in which the drive sleeve is axially push fitted onto the pump shaft.
4. A pump rotor according to claim 3, in which the drive sleeve and the pump shaft have interfitting axially extending spline means formed in their confronting surfaces.
5. A pump rotor according to claim 4, in which the seal means seals against an annular portion of the peripheral surface of the pump shaft which is spaced from the spline means of the pump shaft in said first axial direction.
6. A pump rotor according to any of the preceding claims, in which said seal means is annular.
7. A pump rotor according to any of the preceding claims, in which the seal means has a semi-circular section.
8. A pump means according to any ofthe preced
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A pump rotor This invention relates to a pump rotor ofthe kind comprising a pump shaft, a drive sleeve mounted on the pump shaft and an efasticallyflexible bladewheel madeofavulcanised material bonded to, e.g. vulcanised-on to, the drive sleeve. Pump rotors of the kind referred to are frequently used in sturdy self-priming pumps for everyday requirements. However, known pump rotors ofthe kind referred to suffer from the practical disadvantage thattheconnection oftheelasticallyflexible blade wheel or impellerto the drive sleeve frequently becomes loose in use. An aim ofthe present invention is to eliminate the above-mentioned disadvantage as far as possible by providing a pump rotor in which the blade wheel remains firmly bonded in use to the drive sleeve even when aggressive, e.g. corrosive, media, such as, for example, caustic soda or P3 solutions, are conveyed bythe pump rotor. According to the invention a pump rotor of the kind referred to is characterised in thatthe blade wheel extends beyond the drive sleeve in a first axial direction, said axially extending portion of the blade wheel having a radially inwardly directed encircling seal means arranged to seal againstthe peripheral surface of the pump shaft. The proposed design of a pump rotoraccordingto the invention is based on the finding that, in contrast tothemetallicmaterial ofthe drive sleeve and in contrast to the elastically flexible material ofthe blade wheel, the adhesive auxiliaries, used for connecting the two parts to one another (e.g. byvulcanisation), react, in many cases, in an extremely sensitive manner to stress from aggressive or corrosive liquids. Even a technically perfect bond provided in a pump rotor can consequently be destroyed after being stressed by the relevant solvents for a relativelyshorttime, and this is undesirable.Accordingly, in the proposed pump rotor according to the invention, the blade wheel, which consists of an elastically flexible material, projects beyond the drive sleeve in an axial direction and has, in the region ofthe projection formed in this way, an encircling bead which projects inwards in a radial direction and which rests againstthe pump shaft under an elastic prestress, making a seal. The profile of the seal or bead is preferably semi-circular, corresponding to the shape of a conventional O-ring. The bead or seal is appropriately spaced, in an axial direction, from any pump shaft connecting means, e.g. splines, onthedriveshaftfor assisting connection of the drive sleeve thereto. In this case the bead or seal is preferablyannularto match the circular cylindrical periphery ofthe pump shaft. Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawing the sole figure of which is a schematic axial sectional view of a pump rotor. Thefigureshowsa pump rotor comprising an impeller or blade wheel 1 mounted via a brass drive sleeve 2 to a pump shaft 3. The blade wheel 1 has eight radially and axially extending blades.The radially outer extremity of each blade isthickened and is in the form of a bead extending parallel to the axis of rotation ofthe pump rotor and having a substantially circular profile. The blade wheel 1 is made of rubber with a Shore A hardness of 72 and is bonded, preferably by vulcanisation to the brass drive sleeve which serves to transmit the rotary movement from the pump shaft 3 to the blade wheel 1.Forthis purpose, the pump shaft 3 and the drive sleeve 2 have, in the region of their confronting surfaces, splined profiles 5which match one another (i.e. interengage or interfitwith each other when the drive sleeve 2 is push fitted onto the splined end of the pump shaft 3) and which extend parallel to the axis of rotation of the pump rotor. The rubber body forming the blade wheel projects or extends axially beyond both ends ofthe drive sleeve 2. The left-hand end (as viewed in the figure) of the blade wheel 1 is closed and completely covers the tubular end of the drive sleeve 2 with the result that secondary substances are prevented from penetrating from this direction into the connecting zone between the drive sleeve and the blade wheel during use ofthe pump rotor. The right-hand end portion (as viewed in the figure) which extends axially beyond the drive sleeve is provided with a radially inwardly extending encircling, preferably annular, bead or seal 4 (typically of semi-circular cross-section) which rests in a statically sealing manner againstthe preferably circular cylindrical periphery ofthe pump shaft. The seal 4 is urged in a resilient manner againstthe periphery of the pump shaft and thus, in use, prevents conveyed medium from reaching the critical connecting zone between the drive sleeve 2 and the blade wheel 1. CLAIMS
1. A pump rotor comprising a pump shaft, a drive sleeve mounted on the pump shaft and an elastically flexible blade wheel madeofavulcanised material bonded to the drive sleeve, wherein a portion of the blade wheel extends beyond the drive sleeve in a first axial direction, said axially extending portion of the blade wheel having a radially inwardly directed encircling seal means arranged to seal againstthe peripheral surfaceofthe pump shaft.
2. A pump rotor according to claim 1, in which the blade wheel is bonded to the drive sleeve by vulcinisation.
3. A pump rotor according to claim 1 or 2, in which the drive sleeve is axially push fitted onto the pump shaft.
4. A pump rotor according to claim 3, in which the drive sleeve and the pump shaft have interfitting axially extending spline means formed in their confronting surfaces.
5. A pump rotor according to claim 4, in which the seal means seals against an annular portion of the peripheral surface of the pump shaft which is spaced from the spline means of the pump shaft in said first axial direction.
6. A pump rotor according to any of the preceding claims, in which said seal means is annular.
7. A pump rotor according to any of the preceding claims, in which the seal means has a semi-circular section.
8. A pump means according to any ofthe preced ing claims, in which the blade wheel has an end face remote from said axially extending portion which is positioned beyond the drive sleeve in a second axial direction opposite to said first axial direction and which coversthe end ofthe pump shaft.
9. Apump rotorconstructed and arranged sub stantiallyas herein described with reference to, and as illustrated in, the sole figure ofthe accompanying drawing.
GB08333434A 1982-12-16 1983-12-15 A pump rotor Expired GB2134191B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19828235321 DE8235321U1 (en) 1982-12-16 1982-12-16 PUMP ROTOR

Publications (3)

Publication Number Publication Date
GB8333434D0 GB8333434D0 (en) 1984-01-25
GB2134191A true GB2134191A (en) 1984-08-08
GB2134191B GB2134191B (en) 1986-11-19

Family

ID=6746557

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08333434A Expired GB2134191B (en) 1982-12-16 1983-12-15 A pump rotor

Country Status (3)

Country Link
DE (1) DE8235321U1 (en)
GB (1) GB2134191B (en)
SE (1) SE8302579L (en)

Also Published As

Publication number Publication date
DE8235321U1 (en) 1983-05-11
GB8333434D0 (en) 1984-01-25
SE8302579D0 (en) 1983-05-05
SE8302579L (en) 1984-06-17
GB2134191B (en) 1986-11-19

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