GB1591592A - Rotary pump and electric motor unit - Google Patents

Rotary pump and electric motor unit Download PDF

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Publication number
GB1591592A
GB1591592A GB95978A GB95978A GB1591592A GB 1591592 A GB1591592 A GB 1591592A GB 95978 A GB95978 A GB 95978A GB 95978 A GB95978 A GB 95978A GB 1591592 A GB1591592 A GB 1591592A
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GB
United Kingdom
Prior art keywords
pump
motor
chamber
shaft
end cap
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.)
Expired
Application number
GB95978A
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.)
DIONIGI M M DE
Original Assignee
DIONIGI M M DE
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
Priority claimed from IT1934977A external-priority patent/IT1076224B/en
Priority claimed from IT2740577A external-priority patent/IT1114142B/en
Application filed by DIONIGI M M DE filed Critical DIONIGI M M DE
Publication of GB1591592A publication Critical patent/GB1591592A/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
    • F01C21/007—General arrangements of parts; Frames and supporting elements

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

Description

(54) ROTARY PUMP AND ELECTRIC MOTOR UNIT (71) I, MANLIO MARIA DE DIONIGI, an Italian citizen, of 1, Via Verdi, Olgiate Olona, Italy, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention is concerned with a rotary pump and electric motor unit, which is particularly but not exclusively designed for supplying pressurized water, at a pressure in the range from 6kg/cm2 to 15 kg/cm2, to a coffee-making apparatus.
According to the present invention, there is provided a rotary pump and electric motor unit comprising:- a stationary motor casing defining therein a single motor chamber and having open first and second ends; a first motor casing end cap removably attachable to, and for closing, the first end of the motor casing; a second motor casing end cap formed as a single integral element, the second end cap being removably attachable to, and for closing, the second end of the motor casing;; motor components positioned within the single motor chamber in a manner such that upon removal of the second end cap from the motor casing all of the motor components may then or subsequently be removed from the single motor chamber through the second end, the motor components including a motor shaft having first and second end regions rotatably supported in the first and second end caps, respectively, by means of first and second bearings, respectively, a motor rotor fixed about the motor shaft, and a motor stator positioned about the motor rotor without any mechanical separation element therebetween;; integral coaxial first and second tubular portions constituted by portions of the second end cap, the first tubular portion forming therein a seal chamber, the second bearing being mounted within and supported by the first tubular portion, and the second tubular portion forming a pump housing having therein a pump chamber, the pump housing including inlet and outlet ports communicating with the pump chamber; a pump shaft extending from the pump chamber into the seal chamber and drivingly couplable to the motor shaft; and pump components including a rotatable pump rotor mounted on the pump shaft and sealed within the pump chamber.
Preferably the second end cap further includes an integral step between the first and second tubular portions and between the seal and pump chambers, at least one pump component abutting the step, and the pump components also including abutment, closure and retainer means fitted in an end region of the pump chamber remote from the step.
Preferably the second end cap further includes a flange-type member extending outwardly from the tubular portions, the member being removably connectible to the second end of the motor casing.
Conveniently the first and second tubular portions extend coaxially on opposite sides of the plane of the flange-type member, and the first tubular portion extends into the single motor chamber, when the second end cap closes off the second end of the motor casing.
Conveniently the single motor chamber includes an annular chamber portion between the exterior of the first tubular portion and the internal surface of the motor casing, and wherein the motor rotor includes ventilation vanes extending into the annular chamber portion.
Preferably the second end of the motor shaft extends beyond the second bearing and into the seal chamber, and the pump shaft includes an extension lockable with respect to the second end of the motor shaft.
Preferably the unit further includes sealing means extending between the pump shaft extension and the interior of the first tubular portion for sealing the pump chamber from the single motor chamber.
The unit of the present invention enables compact, economical and efficient pump and motor construction to be provided.
For a better understanding of the present invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: Figure 1 is a longitudinal partly elevalional and partly sectional view of the complete pump and motor unit, only part of the motor being shown as its axial dimension is not of interest to the present invention; Figure 2 is a fragmentary and elevational end view of the pump-including part of the unit; Figure 3 is a view similar to that of Fig. 1, but with the second end cap and pump removed; Figure 4 similarily illustrates the second end cap and pump, not shown in Figure 3;; Figure 5 is a fragmentary exploded view illustrating in grcater detail some of the structural components designed to be associated to form the unit of Figure I; Figure 6 is an exploded view of some of the internal components of the pump, together with some parts (fragmentarily shown in phantom lines) to be associated therewith; and Figure 7 is an exploded view similar to that of Figure 6 of some of the components designed for providing a fluid-tight arrangement between the pump and the motor.
Referring now to the drawings, wherein like reference numerals refer to like parts throughout the several figures, the electric motor comprises a casing, in this case a cylindrical casing 10, having a stator 12 secured thereinto. The motor casing 10 can be complemented with a base l0a and with electrical components such as a condenser lOb, if expedient and according to current art.
The casing 10 of the motor is provided with oppositely located first and second end caps 14 and 16, wherein first and second bearings 18 and 20, respectively, are mounted for rotatably supporting a motor shaft 22, about which a motor rotor 24 is secured. The end cap 14 may be per se essentially conventional. The end cap 16 is adjacent to the pump and is of a special design, characteristic of the present invention, as will be detailedly discussed below.
The geometry and the arrangement of the motor components, relative to the geometry of the end cap 16, provide for mounting and taking advantage of particularly shaped fan vanes 26 (as shown in Figures 1, 3 and 5) for ensuring efficient cooling of the motor, the casing 10 being provided with ventilation outlet ports 28. Ventilation inlet ports such as indicated at 30 and 32, are provided for example in the end caps 14 and 16, respectively.
The second end cap 16 is formed as a single integral element which characteristically appertains both to the motor and to the pump, as it embodies both one end cap for the motor and the pump housing.
In consideration of the fact that in a combined pump and motor unit of the kind and for the use referred to above the diame ter of the pump is noticeably smaller than that of the motor, the end cap 16 comprises an essentially flat annular outer portion in the form of a flange 34 adapted to be secured to the second end of the casing 10, and coaxial essentially tubular portions 36 and 38 located respectively inside and outside (in the finally assembled unit) of the transverse plane defined by the flange 34. The portions 36 and 38 define a seal housing and pump housing respectively.
In the portions 36 and 38 co-axial chambers 40 and respectively 42 are formed (see particularly Figure 5) designed respectively for seating the second bearing 20 (a ball bearing, in this case) in a portion 40a, and for housing the pump components including the pump rotor (generally indicated by R in Figures 4 and 6) and bearing discs 50 and 52, in which bearing bosses 46 and 48 of the pump rotor R are rotatably seated. The chamber 42 forms therefore the pump chamber portion and the tubular portion 38 has the pump inlet and outlet ports 44 integrally formed therewith.
The second end cap 16 combines therefore two distinct functions: (a) the structure comprising the flange 34 and tubular portion 36 forms the one end cap wall of the motor and supports one of two bearings (the bearing 20) for the motor shaft.
The resulting motor is operative irrespective of the fact that the pump (or any other driven mechanism) is drivably coupled to the motor shaft; and (b) the structure comprising the tubular portion 38 and ports 44 can house the rotor and the other elements of the pump, for example a vane type pump, thus forming an operative pump irrespective of the motor or other source of rotary motion drivingly coupled to the pump rotor.
Further, known combinations of motor and pump require sealing means for preventing the pressurized liquid, namely water, from leaking from the pump chamber to the motor environment, the sealing means being generally located in a seal chamber. In the illustrated embodiment of the unit of the present invention, the seal chamber is formed in the chamber 40 provided within the tubular portion 36 of end cap 16, the sealing means being generally indicated by T in Figures 4 and 7. In the same seal chamber 40 there are housed the coupling means by which the driving motor shaft 22 is coupled to the driven pump rotor R.
Various arrangements can be devised by those skilled in art for constructing and assembling an improved unit comprising the above-described combination of essential components, according to the present invention. A preferred but not critical construction is illustrated in detail in the accompanying drawings and will now briefly be described.
The pump construction is per se conven tional and it comprises, together with a rotor R having an eccentric body 58 provided with vane slots (the details including the pump vane slots and vanes are not illustrated; they are well known in the art and do not form part of the present invention) and rotatably and sealedly supported by the bearing discs 50 and 52, preferably made of graphite, a short shaft 56 having an extension 56b (Fig.
6) secured, by a forced fit for example, in the body 58 of the rotor R to form an extension shaft therefor. At its outer end, the shaft 56 comprises a tongue 56a complementary to a diametral slot 54a (Figs. 5 and 6) formed at the end region of an extension 54 of the motor shaft 22, which is stepped at 22b to form an abutment for proper location in the ball bearing 20. At its opposite end portion, the same shaft 22 is provided with a slot 22a (Figs. 1 and 3) wherein a screwdriver or other suitable tool can be engaged for manually rotating the rotary pump and motor assem bly when desired, such as for priming the pump.
As particularly shown in Figures 5 and 7, the tubular portions 36 and 38 of the end -wall 16 are relatively stepped where the chambers 40 and 42 are adjacent. The step forms an abutment on which the inner disc 50 of the pump system abuts when the pump is assembled in chamber 42. Upon assembling the pump (as shown in Figures 1 and 4), the outer end of the chamber is sealed by an O-ring 72 (Fig. 5) a disc-like closure cap 64 and a retainer ring 70 seated in a groove 74, to secure the pump components in position.
The axial positioning of the motor shaft and rotor 22, 24 arrangement is ensured, at the pump side, by a retainer ring 78, seated in an annular groove 66 (as shown in Figures 5 and 6) on which the bearing 20 abuts through the medium of a spacer ring 80, there also being spring means (diagrammatically indi cated by 18a in Figure 1) associated with the opposite bearing 18 for applying a vibration preventing, slight permanent axial thrust to the motor shaft/rotor structure.
The sealing means T comprises the part shown in Figure 7, and it is arranged in a known manner; thus a rubber ring 60c forms a fluid tight seat for a stationary ceramic ring 60b having a planar front face on which fluidtightly abuts a complementary rotary ceramic ring 60a seated in a cup 62b axially urged by a spring 62. The axial thrust provided by the spring 62 (or other resilient means), seated in a cup 62a, provides a permanent abutment between the relatively rotating parts 60a and 60b even if no fluid pressure is applied in the pump chamber.
Another rubber ring 68 provides a seal between the extension 56 of the pump rotor shaft and the ceramic ring 60a, which concurrently rotates.
The tubular portion 36, wherein the seal chamber is arranged, is provided with small vents 82 for exhausting any generally very small amounts of water which might pass across the sealing means T. Such amounts, if any, will reach the motor environment where the vanes 26 rotate and will promptly be exhausted via the ports 28.
The above-described arrangement provides several additional advantages: the assembling of the motor is easy and essentially conventional. The second end cap 16, having the bearing 20, is assembled with the motor casing as any conventional motor end cap is, and is secured by any suitable means, in this case by a stud and nut arrangement lOc. The extension 54 and slot 54a of the motor shaft are external to the bearing 20 and inside the chamber 40 of end cap 16, which provides by itself the seats and the chamber for arranging the pump components and systems, in perfect co-axial relationship with the motor.
The unit of the present invention permits ready dismantling for replacing worn-out or damaged components, if desired. By removing the subassembly of Figure 4, in its entirety, the rotor 24 can be promptly removed together with the motor shaft 22. If in contrast the replacement of the pump system is required, by removing the retainer 70, plate cover 64 and O-ring 72, any component of the said pump subsystem can be removed, together with rotating parts (60a and 62b) of the sealing means T.
The second end cap 16 can be intergrally formed of cast and machined bronze or other suitable alloy adapted to resist to the pumped fluid.
WHAT I CLAIM IS: 1. A rotary pump and electric motor unit comprising: a stationary motor casing defining therein a single motor chamber and having open first and second ends; a first motor casing end cap removably attachable to, and for closing, the first end of the motor casing; a second motor casing end cap formed as a single integral element, the second end cap being removably attachable to, and for closing, the second end of the motor casing; ; motor components positioned within the single motor chamber in a manner such that upon removal of the second end cap from the motor casing all of the motor components may then or subsequently be removed from the single motor chamber through the second end, the motor components including a motor shaft having first and second end regions rotatably supported in the first and second end caps, respectively, by means of first and second bearings, respectively, a motor rotor fixed about the motor shaft, and
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    drawings and will now briefly be described.
    The pump construction is per se conven tional and it comprises, together with a rotor R having an eccentric body 58 provided with vane slots (the details including the pump vane slots and vanes are not illustrated; they are well known in the art and do not form part of the present invention) and rotatably and sealedly supported by the bearing discs
    50 and 52, preferably made of graphite, a short shaft 56 having an extension 56b (Fig.
    6) secured, by a forced fit for example, in the body 58 of the rotor R to form an extension shaft therefor. At its outer end, the shaft 56 comprises a tongue 56a complementary to a diametral slot 54a (Figs. 5 and 6) formed at the end region of an extension 54 of the motor shaft 22, which is stepped at 22b to form an abutment for proper location in the ball bearing 20. At its opposite end portion, the same shaft 22 is provided with a slot 22a (Figs. 1 and 3) wherein a screwdriver or other suitable tool can be engaged for manually rotating the rotary pump and motor assem bly when desired, such as for priming the pump.
    As particularly shown in Figures 5 and 7, the tubular portions 36 and 38 of the end -wall 16 are relatively stepped where the chambers 40 and 42 are adjacent. The step forms an abutment on which the inner disc
    50 of the pump system abuts when the pump is assembled in chamber 42. Upon assembling the pump (as shown in Figures 1 and 4), the outer end of the chamber is sealed by an O-ring 72 (Fig. 5) a disc-like closure cap 64 and a retainer ring 70 seated in a groove 74, to secure the pump components in position.
    The axial positioning of the motor shaft and rotor 22, 24 arrangement is ensured, at the pump side, by a retainer ring 78, seated in an annular groove 66 (as shown in Figures 5 and 6) on which the bearing 20 abuts through the medium of a spacer ring 80, there also being spring means (diagrammatically indi cated by 18a in Figure 1) associated with the opposite bearing 18 for applying a vibration preventing, slight permanent axial thrust to the motor shaft/rotor structure.
    The sealing means T comprises the part shown in Figure 7, and it is arranged in a known manner; thus a rubber ring 60c forms a fluid tight seat for a stationary ceramic ring 60b having a planar front face on which fluidtightly abuts a complementary rotary ceramic ring 60a seated in a cup 62b axially urged by a spring 62. The axial thrust provided by the spring 62 (or other resilient means), seated in a cup 62a, provides a permanent abutment between the relatively rotating parts 60a and 60b even if no fluid pressure is applied in the pump chamber.
    Another rubber ring 68 provides a seal between the extension 56 of the pump rotor shaft and the ceramic ring 60a, which concurrently rotates.
    The tubular portion 36, wherein the seal chamber is arranged, is provided with small vents 82 for exhausting any generally very small amounts of water which might pass across the sealing means T. Such amounts, if any, will reach the motor environment where the vanes 26 rotate and will promptly be exhausted via the ports 28.
    The above-described arrangement provides several additional advantages: the assembling of the motor is easy and essentially conventional. The second end cap 16, having the bearing 20, is assembled with the motor casing as any conventional motor end cap is, and is secured by any suitable means, in this case by a stud and nut arrangement lOc. The extension 54 and slot 54a of the motor shaft are external to the bearing 20 and inside the chamber 40 of end cap 16, which provides by itself the seats and the chamber for arranging the pump components and systems, in perfect co-axial relationship with the motor.
    The unit of the present invention permits ready dismantling for replacing worn-out or damaged components, if desired. By removing the subassembly of Figure 4, in its entirety, the rotor 24 can be promptly removed together with the motor shaft 22. If in contrast the replacement of the pump system is required, by removing the retainer 70, plate cover 64 and O-ring 72, any component of the said pump subsystem can be removed, together with rotating parts (60a and 62b) of the sealing means T.
    The second end cap 16 can be intergrally formed of cast and machined bronze or other suitable alloy adapted to resist to the pumped fluid.
    WHAT I CLAIM IS: 1. A rotary pump and electric motor unit comprising: a stationary motor casing defining therein a single motor chamber and having open first and second ends; a first motor casing end cap removably attachable to, and for closing, the first end of the motor casing; a second motor casing end cap formed as a single integral element, the second end cap being removably attachable to, and for closing, the second end of the motor casing;; motor components positioned within the single motor chamber in a manner such that upon removal of the second end cap from the motor casing all of the motor components may then or subsequently be removed from the single motor chamber through the second end, the motor components including a motor shaft having first and second end regions rotatably supported in the first and second end caps, respectively, by means of first and second bearings, respectively, a motor rotor fixed about the motor shaft, and
    a motor stator positioned about the motor rotor without any mechanical separation element therebetween; integral coaxial first and second tubular portions constituted by portions of the second end cap, the first tubular portion forming therein a seal chamber, the second bearing being mounted within and supported by the first tubular portion, and the second tubular portion forming a pump housing having therein a pump chamber the pump housing including inlet and outlet ports communicating with the pump chamber; a pump shaft extending from the pump chamber into the seal chamber and drivingly couplable to the motor shaft; and pump components including a rotatable pump rotor mounted on the pump shaft and sealed within the pump chamber.
  2. 2. A unit as claimed in claim I, wherein the second end cap further includes an integral step between the first and second tubular portions and between the seal and pump chambers, at least one pump component abutting the step, and the pump components also including abutment, closure and retainer means fitted in an end region of the pump chamber remote from the step.
  3. 3. A unit as claimed in claim 1 or 2, wherein the second end cap further includes a flange-type member extending outwardly from the tubular portions, the member being removably connectible to the second end of the motor casing.
  4. 4. A unit as claimed in claim 3, wherein the first and second tubular portions extend coaxially on opposite sides of the plane of the flange-type member, and the first tubular portion extends into the single motor chamber, when the second end cap closes off the second end of the motor casing.
  5. 5. A unit as claimed in claim 4, wherein the single motor chamber inludes an annular chamber portion between the exterior of the first tubular portion and the internal surface of the motor casing, and wherein the motor rotor includes ventilation vanes extending into the annular chamber portion.
  6. 6. A unit as claimed in any preceding claim, wherein the second end of the motor shaft extends beyond the second bearing and into the seal chamber, and the pump shaft includes an extension lockable with respect to the second end of the motor shaft.
  7. 7. A unit as claimed in claim 6, which further includes sealing means extending between the pump shaft extension and the interior of the first tubular portion for sealing the pump chamber from the single motor chamber.
  8. 8. A rotary pump and electric unit according to claim 1, substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
GB95978A 1977-01-17 1978-01-10 Rotary pump and electric motor unit Expired GB1591592A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1934977A IT1076224B (en) 1977-01-17 1977-01-17 Combined pump motor unit - has pump housing integral with motor end cover containing one motor bearing and coupled coaxial shafts
IT2740577A IT1114142B (en) 1977-09-09 1977-09-09 Combined pump motor unit - has pump housing integral with motor end cover containing one motor bearing and coupled coaxial shafts

Publications (1)

Publication Number Publication Date
GB1591592A true GB1591592A (en) 1981-06-24

Family

ID=26327146

Family Applications (1)

Application Number Title Priority Date Filing Date
GB95978A Expired GB1591592A (en) 1977-01-17 1978-01-10 Rotary pump and electric motor unit

Country Status (2)

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DE (1) DE2801514A1 (en)
GB (1) GB1591592A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158154A (en) * 1984-04-25 1985-11-06 Facet Enterprises Rotary fuel-pump for an I.C. engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158154A (en) * 1984-04-25 1985-11-06 Facet Enterprises Rotary fuel-pump for an I.C. engine

Also Published As

Publication number Publication date
DE2801514A1 (en) 1978-07-20

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee