WO1995008047A1 - Sliding vane motor - Google Patents

Sliding vane motor Download PDF

Info

Publication number
WO1995008047A1
WO1995008047A1 PCT/SE1994/000809 SE9400809W WO9508047A1 WO 1995008047 A1 WO1995008047 A1 WO 1995008047A1 SE 9400809 W SE9400809 W SE 9400809W WO 9508047 A1 WO9508047 A1 WO 9508047A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
rotor
passage
sliding vane
vane motor
Prior art date
Application number
PCT/SE1994/000809
Other languages
French (fr)
Inventor
Hans Olofsson
Original Assignee
Tetra Laval Holdings & Finance S.A.
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 Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Priority to AU77122/94A priority Critical patent/AU7712294A/en
Publication of WO1995008047A1 publication Critical patent/WO1995008047A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01J—MANUFACTURE OF DAIRY PRODUCTS
    • A01J7/00—Accessories for milking machines or devices
    • 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
    • F01C20/00—Control of, monitoring of, or safety arrangements for, machines or engines
    • F01C20/08—Control of, monitoring of, or safety arrangements for, machines or engines characterised by varying the rotational speed
    • 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
    • F01C20/00—Control of, monitoring of, or safety arrangements for, machines or engines
    • F01C20/28—Safety arrangements; Monitoring

Definitions

  • the present invention relates to a sliding vane motor, comprising a housing forming a cylindrical rotor chamber, a rotor eccentrically arranged in the cylindri ⁇ cal rotor chamber, and a plurality of vanes arranged radially displaceably in the rotor.
  • the housing, the vanes and the rotor form a plurality of pressure spaces sealed from each other and distributed in series around the circumference of the rotor, the volume of each pressure space being varied during operation of the sliding vane motor, when the pressure spaces are rotated by means of the vanes in the rotor chamber.
  • the sliding vane motor further comprises an inlet for the supply of air to the rotor chamber at a first pressure, and an outlet for the discharge of air from the rotor chamber at a second pressure, which is lower than the first pressure.
  • a conventional sliding vane motor of this kind for instance known from WO 93/00002, will rapidly achieve a very high rotational speed, when it is started unloaded or moderately loaded, which gives rise to a sudden shrill noise from the sliding vane motor.
  • a sudden shrill noise from the sliding vane motor.
  • the removal device comprises a relatively light cord, which normally has to be stretched by the sliding vane motor before the relatively heavy milking means is pulled off.
  • the sliding vane motor may have time to race at a high rotational speed, which gives rise to said annoying shrill noises.
  • the object of the present invention is to provide a sliding vane motor which will not give rise to disturbing shrill noises because of too high rotational speeds of the sliding vane motor when starting the sliding vane motor.
  • a sliding vane motor of the kind stated initially which is characterized in that a passage extends through the rotor between at least a first and a second of said pressure spaces, and that a valve device is adapted to keep the passage closed, when the rotational speed of the rotor is less than a predetermined value, and to keep the passage open, when the rotational speed of the rotor amounts to at least said predetermined value.
  • the pressure difference between the pressures in the first and the second pressure spaces is reduced, when the rotational speed of the rotor amounts to at least said predeter ⁇ mined value and the passage as a consequence thereof is kept open, which means that the rotational speed of the rotor is limited. Therefore the sliding vane motor can be given a relatively low rotational speed when it is operated unloaded or moderately loaded, whereby strong shrill noises from the sliding vane motor are avoided.
  • the first and second pressure spaces are suitably situated at substantially diametri ⁇ cally opposite sides of the rotor.
  • valve device is controlled by the pressures in the first and second pressure spaces such that the valve device keeps the passage closed during operation of the sliding vane motor, when said pressures differ from each other and the rotational speed of the rotor is less than said predetermined value.
  • the valve device comprises a first valve member and a second valve member, both being freely movable in the passage between respective closing positions, in which the valve members keep the passage closed, and respective opening positions, in which the valve members keep the passage open.
  • the first valve member is adapted to be forced against its closing position under the influence of the pressure in the first pressure space, when this pressure exceeds the pressure in the second pressure space
  • the second valve member is adapted to be forced against its closing position under the influence of the pressure in the second pressure space, when this pressure exceeds the pressure in the first pressure space
  • the first and second valve members being adapted to be brought towards their respective opening positions under the influence of centrifugal force independent of the prevailing pressures in the pressure spaces, when the rotational speed of the rotor amounts to at least said predeter- mined value.
  • said passage may extend between a third pressure space and said first and second pressure spaces, the valve device being adapted to keep the passage closed, when the pressures in at least two of the first, second and third pressure spaces differ from each other and the rotational speed of the rotor is less than said predetermined value.
  • said passage may extend between a fourth pressure space and said first, second and third pressure spaces, the valve device being adapted to close the passage, when the pressures in at least two of the first, second, third and fourth pressure spaces differ from each other and the rotatio ⁇ nal speed of the rotor is less than said predetermined value.
  • said passage may extend in the rotor between more than four pressure spaces.
  • a second passage extends through the rotor between a third and a fourth of said pressure spaces, a second valve device being adapted to keep the second passage closed, when the rotational speed of the rotor is less than said pre- determined value, and to keep the second passage open, when the rotational speed of the rotor amounts to at least said predetermined value. Since the through-flow area of a passage through the rotor is limited centrally in the latter by the radial motion of the vanes in the rotor, the required through-flow area may be impossible to achieve by means of one single passage.
  • each of these passages only needs to be designed with half the required through-flow area and therefore it will be easier to find space for the passage centrally in the rotor.
  • the sliding vane motor runs more steady when the rotational speed of the rotor amounts to at least said predetermined value, since the pressures in totally four of the pressure spaces are equalized by means of the two passages.
  • more than two passages may be arranged in the rotor, each passage extending between at least two pressure spaces and being provided with a valve device of the kind described above.
  • figure 1 shows a housing for a sliding vane motor accor- ding to the invention
  • figure 2 shows a section along the line II-II in figure 1 of a preferred first embodiment of the sliding vane motor according to the invention
  • FIGS. 3a-3c schematically show a second embodiment of the sliding vane motor according to the invention, three turning positions of rhe rotor of the sliding vane motor being illustrated, when the rotational speed of the rotor is less than a predetermined value.
  • figures 4a-4c show the same embodiment of the sliding vane motor as figures 3a-3c, but when the rotational speed of the rotor exceeds said predetermined value
  • FIGS. 5 and 6 schematically show a third and a fourth embodiment of the sliding vane motor according to the invention, respectively.
  • a preferred first embodiment of the sliding vane motor according to the invention is illustrated in figures 1 and 2 and comprises a housing 1 forming a cylindrical rotor chamber 2, a rotor 3 eccentrically arranged in the rotor chamber 2 and four vanes 4, which are radially displaceable in the rotor 3 and are evenly distributed around the latter.
  • the housing 1, the vanes 4 and the rotor 3 form four pressure spaces 5-8 sealed from each other and distributed in series around the circumference of the rotor.
  • In the housing 1 there is an inlet 9 for supplying air from the ambience of the sliding vane motor to the rotor chamber 2 and an outlet 10 for discharging air from the rotor chamber 2 at a pressure lower than atmospheric pressure.
  • the outlet 10 is intended to be connected to a source of vacuum not shown in the drawing.
  • a substantially straight passage 11 extends diametri ⁇ cally through the rotor 3 between two pressure spaces 6 and 8 situated at opposite sides of the rotor 3.
  • the passage 11 there are two valve members 12 and 13, respectively, which are arranged freely movably in the passage 11 between respective closing positions, in which the valve members 12, 13 keep the passage closed, and respective opening positions, in which the valve members 12, 13 keep the passage open.
  • a further substan ⁇ tially straight passage 14 extends diametrically through the rotor 3 between the two other pressure spaces 5 and 7.
  • the passage 14 is also provided with two valve members 15 and 16, respectively, which are arranged freely movably in the passage 14 in the same manner as described above for the valve members 12, 13. In relation to the rotor 3 the passages 11 and 14 are axially spaced from each other.
  • Each valve member 12, 13, 15, 16 comprises a solid spherical body, which is arranged to seal in its closing position against a valve seating 17 formed by the rotor 3 and extending around the passage (11 or 14) in which the valve member 12, 13, 15, 16 is freely movable.
  • the spherical body may be designed like a shell.
  • the stop members 18 comprise pins, which extend across the passages 11, 14 and are attached to the rotor 3.
  • FIGS 3a-3c and 4a-4c schematically show a second embodiment of the sliding vane motor according to the invention, which illustrates the invention more clearly.
  • the sliding vane motor according to figures 3a-3c and 4a-4c comprises a housing 19, a rotor 20 in the housing 19, and four vanes 22 symmetrically arranged in the rotor 20.
  • the housing 19, the rotor 20 and the vanes 22 form four pressure spaces 23-26.
  • the housing 19 has an inlet 30, which communicates with atmosphere, and an outlet 31, which is connected to a source of vacuum not shown.
  • FIGS 3a-3c there are shown three turning positions of the rotor 20, when after starting the sliding vane motor the rotor has a rotational speed still being less than a predetermined value.
  • atmospheric pressure prevails in the pressure space 25, while vacuum prevails in the pressure space 23.
  • vacuum prevails in the pressure space 23.
  • the valve member 29 is forced against its valve seating and closes the passage 27, while the valve member 28 is forced against its opening position.
  • the rotor 20 according to figure 3b the rotor 20 has been turned counter-clockwise somewhat less than a quarter of a revolution from the turning position according to figure 3a, atmospheric pressure and vacuum still prevailing in the pressure spaces 25 and 23, respectively, so that the valve member 29 keeps the passage 27 closed.
  • valve members 28, 29 are influenced by centrifugal forces which keep them constantly in their opening positions independent of the pressures in the pressure spaces 23 and 25.
  • the passage 27 is kept open, which has the consequence that the difference between the pressures in the pressure spaces 23 and 25 is reduced, whereby the rotational speed of the rotor 20 is limited.
  • FIG. 5 schematically shows a third embodiment of the sliding vane motor according to the invention, com ⁇ prising a housing 32, a rotor 33 in the housing 32, and three vanes 34, which are symmetrically arranged in the rotor 33.
  • the housing 32, the rotor 33 and the vanes 34 form three pressure spaces 35-37.
  • Figure 6 schematically shows a fourth embodiment of the sliding vane motor according to the invention, which is identical to the embodiment according to figures 3a-3c, 4a-4c, except that the passage 40 of the rotor 20 branches off to all pressure spaces 23-26 and that the passage 40 is provided with two further valve members 41, 42, which are arranged in the branches of the passage 40 which open into the pressure spaces 24 and 26, respectively.

Abstract

A sliding vane motor comprises a housing (1), a rotor (3), a plurality of vanes (4), the housing (1), the vanes (4) and the rotor (3) forming a plurality of pressure spaces (5, 6, 7, 8) sealed from one another. According to the invention the sliding vane motor comprises at least one passage (11) extending through the rotor between at least a first (6) and a second (8) of said pressure spaces and a valve device (12, 13, 17, 18) adapted to keep the passage (11) closed, when the rotational speed of the rotor (3) is less than a predetermined value, and to keep the passage (11) open, when the rotational speed of the rotor (3) amounts to at least said predetermined value.

Description

Sliding vane motor
The present invention relates to a sliding vane motor, comprising a housing forming a cylindrical rotor chamber, a rotor eccentrically arranged in the cylindri¬ cal rotor chamber, and a plurality of vanes arranged radially displaceably in the rotor. The housing, the vanes and the rotor form a plurality of pressure spaces sealed from each other and distributed in series around the circumference of the rotor, the volume of each pressure space being varied during operation of the sliding vane motor, when the pressure spaces are rotated by means of the vanes in the rotor chamber. The sliding vane motor further comprises an inlet for the supply of air to the rotor chamber at a first pressure, and an outlet for the discharge of air from the rotor chamber at a second pressure, which is lower than the first pressure.
A conventional sliding vane motor of this kind, for instance known from WO 93/00002, will rapidly achieve a very high rotational speed, when it is started unloaded or moderately loaded, which gives rise to a sudden shrill noise from the sliding vane motor. When people or in particular animals have to be in the vicinity of such a conventional sliding vane motor such a shrill starting noise can be annoying. Thus, it has been proved that cows are disturbed by the starting noise from conven¬ tional sliding vane motors adapted to operate automatic removal devices for milking means. This is so because the removal device comprises a relatively light cord, which normally has to be stretched by the sliding vane motor before the relatively heavy milking means is pulled off. During said stretching of the cord the sliding vane motor may have time to race at a high rotational speed, which gives rise to said annoying shrill noises.
The object of the present invention is to provide a sliding vane motor which will not give rise to disturbing shrill noises because of too high rotational speeds of the sliding vane motor when starting the sliding vane motor.
This object is obtained by means of a sliding vane motor of the kind stated initially, which is characterized in that a passage extends through the rotor between at least a first and a second of said pressure spaces, and that a valve device is adapted to keep the passage closed, when the rotational speed of the rotor is less than a predetermined value, and to keep the passage open, when the rotational speed of the rotor amounts to at least said predetermined value. Hereby the pressure difference between the pressures in the first and the second pressure spaces is reduced, when the rotational speed of the rotor amounts to at least said predeter¬ mined value and the passage as a consequence thereof is kept open, which means that the rotational speed of the rotor is limited. Therefore the sliding vane motor can be given a relatively low rotational speed when it is operated unloaded or moderately loaded, whereby strong shrill noises from the sliding vane motor are avoided.
To provide an even speed of the sliding vane motor even when the passage is open, the first and second pressure spaces are suitably situated at substantially diametri¬ cally opposite sides of the rotor.
With advantage the valve device is controlled by the pressures in the first and second pressure spaces such that the valve device keeps the passage closed during operation of the sliding vane motor, when said pressures differ from each other and the rotational speed of the rotor is less than said predetermined value.
Preferably, the valve device comprises a first valve member and a second valve member, both being freely movable in the passage between respective closing positions, in which the valve members keep the passage closed, and respective opening positions, in which the valve members keep the passage open. The first valve member is adapted to be forced against its closing position under the influence of the pressure in the first pressure space, when this pressure exceeds the pressure in the second pressure space, and the second valve member is adapted to be forced against its closing position under the influence of the pressure in the second pressure space, when this pressure exceeds the pressure in the first pressure space, the first and second valve members being adapted to be brought towards their respective opening positions under the influence of centrifugal force independent of the prevailing pressures in the pressure spaces, when the rotational speed of the rotor amounts to at least said predeter- mined value.
According to an embodiment of the sliding vane motor according to the invention said passage may extend between a third pressure space and said first and second pressure spaces, the valve device being adapted to keep the passage closed, when the pressures in at least two of the first, second and third pressure spaces differ from each other and the rotational speed of the rotor is less than said predetermined value. According to another embodiment of the sliding vane motor according to the invention said passage may extend between a fourth pressure space and said first, second and third pressure spaces, the valve device being adapted to close the passage, when the pressures in at least two of the first, second, third and fourth pressure spaces differ from each other and the rotatio¬ nal speed of the rotor is less than said predetermined value.
Alternatively, said passage may extend in the rotor between more than four pressure spaces.
According to a preferred embodiment of the sliding vane motor according to the invention a second passage extends through the rotor between a third and a fourth of said pressure spaces, a second valve device being adapted to keep the second passage closed, when the rotational speed of the rotor is less than said pre- determined value, and to keep the second passage open, when the rotational speed of the rotor amounts to at least said predetermined value. Since the through-flow area of a passage through the rotor is limited centrally in the latter by the radial motion of the vanes in the rotor, the required through-flow area may be impossible to achieve by means of one single passage. With two separate passages through the rotor the advantage is achieved that each of these passages only needs to be designed with half the required through-flow area and therefore it will be easier to find space for the passage centrally in the rotor. In addition, the sliding vane motor runs more steady when the rotational speed of the rotor amounts to at least said predetermined value, since the pressures in totally four of the pressure spaces are equalized by means of the two passages. Alternatively, more than two passages may be arranged in the rotor, each passage extending between at least two pressure spaces and being provided with a valve device of the kind described above.
The invention is described more closely in the following with reference to the accompanying drawing, in which
figure 1 shows a housing for a sliding vane motor accor- ding to the invention,
figure 2 shows a section along the line II-II in figure 1 of a preferred first embodiment of the sliding vane motor according to the invention,
figures 3a-3c schematically show a second embodiment of the sliding vane motor according to the invention, three turning positions of rhe rotor of the sliding vane motor being illustrated, when the rotational speed of the rotor is less than a predetermined value.
figures 4a-4c show the same embodiment of the sliding vane motor as figures 3a-3c, but when the rotational speed of the rotor exceeds said predetermined value, and
figures 5 and 6 schematically show a third and a fourth embodiment of the sliding vane motor according to the invention, respectively.
A preferred first embodiment of the sliding vane motor according to the invention is illustrated in figures 1 and 2 and comprises a housing 1 forming a cylindrical rotor chamber 2, a rotor 3 eccentrically arranged in the rotor chamber 2 and four vanes 4, which are radially displaceable in the rotor 3 and are evenly distributed around the latter. The housing 1, the vanes 4 and the rotor 3 form four pressure spaces 5-8 sealed from each other and distributed in series around the circumference of the rotor. In the housing 1 there is an inlet 9 for supplying air from the ambience of the sliding vane motor to the rotor chamber 2 and an outlet 10 for discharging air from the rotor chamber 2 at a pressure lower than atmospheric pressure. The outlet 10 is intended to be connected to a source of vacuum not shown in the drawing.
A substantially straight passage 11 extends diametri¬ cally through the rotor 3 between two pressure spaces 6 and 8 situated at opposite sides of the rotor 3. In the passage 11 there are two valve members 12 and 13, respectively, which are arranged freely movably in the passage 11 between respective closing positions, in which the valve members 12, 13 keep the passage closed, and respective opening positions, in which the valve members 12, 13 keep the passage open. A further substan¬ tially straight passage 14 extends diametrically through the rotor 3 between the two other pressure spaces 5 and 7. The passage 14 is also provided with two valve members 15 and 16, respectively, which are arranged freely movably in the passage 14 in the same manner as described above for the valve members 12, 13. In relation to the rotor 3 the passages 11 and 14 are axially spaced from each other.
Each valve member 12, 13, 15, 16 comprises a solid spherical body, which is arranged to seal in its closing position against a valve seating 17 formed by the rotor 3 and extending around the passage (11 or 14) in which the valve member 12, 13, 15, 16 is freely movable. As an alternative the spherical body may be designed like a shell. In each passage 11, 14, there are two stop members 18, against which the respective valve members in the passage 11, 14 abut when they are in their opening positions. The stop members 18 comprise pins, which extend across the passages 11, 14 and are attached to the rotor 3.
During operation of the sliding vane motor the outlet 10 is connected to a source of vacuum, with the result that the rotor 3 is rotated counter-clockwise as it is illustrated in figure 2. As long as the rotational speed of the rotor 3 is less than a predetermined value either of the two valve members 12, 13 in the passage 11 and either of the valve members 15, 16 in the passage 14 will be pressed against its valve seating 17 under influence of the pressure difference between the pressure spaces 6 and 8 connected by the passage 11, and the pressure spaces 5 and 7 connected by the passage 14. When the rotational speed of the rotor 3 amounts to at least said predetermined value all valve members 12, 13, 15, 16 are influenced by centrifugal forces which are strong enough to keep the valve members 12, 13, 15, 16 constantly pressed against the stop members 18. Hereby the passages 11, 14 are kept open, with the result that the pressure differences between the pressure spaces 5-8 are reduced, so that the rotational speed of the rotor 3 is limited. Said predetermined value of the rotational speed of the rotor 3 may be achieved by a suitable choice of weight and size of each valve member 12, 13, 15, 16.
Figures 3a-3c and 4a-4c schematically show a second embodiment of the sliding vane motor according to the invention, which illustrates the invention more clearly. The sliding vane motor according to figures 3a-3c and 4a-4c comprises a housing 19, a rotor 20 in the housing 19, and four vanes 22 symmetrically arranged in the rotor 20. The housing 19, the rotor 20 and the vanes 22 form four pressure spaces 23-26. In the rotor 20 there is a passage 27 extending between two pressure spaces 23 and 25 and provided with two valve members 28 and 29. The housing 19 has an inlet 30, which communicates with atmosphere, and an outlet 31, which is connected to a source of vacuum not shown.
In figures 3a-3c there are shown three turning positions of the rotor 20, when after starting the sliding vane motor the rotor has a rotational speed still being less than a predetermined value. In the turning position according to figure 3a atmospheric pressure prevails in the pressure space 25, while vacuum prevails in the pressure space 23. This has the consequence that the valve member 29 is forced against its valve seating and closes the passage 27, while the valve member 28 is forced against its opening position. In the turning position of the rotor 20 according to figure 3b the rotor 20 has been turned counter-clockwise somewhat less than a quarter of a revolution from the turning position according to figure 3a, atmospheric pressure and vacuum still prevailing in the pressure spaces 25 and 23, respectively, so that the valve member 29 keeps the passage 27 closed. In the turning position of the rotor 20 according to figure 3c the rotor 20 has been turned slightly more than a quarter of a revolution from the turning position according to figure 3a, the pressure space 25 being connected via the outlet 31 to said source of vacuum and the pressure space 23 being connec¬ ted via the inlet 30 to atmosphere. This has the conse¬ quence that the valve member 28 is forced against its valve seating and closes the passage 27, while the valve member 29 is forced against its opening position. In this manner the valve members 28 and 29 alternately keep the passage 27 closed, as long as the rotational speed of the rotor 20 is less than said predetermined value.
In figures 4a-4c there are shown the same turning positions of the rotor 20 as in figures 3a-3c, when the rotor 20 attains a rotational speed which at least amounts to said predetermined value. In this case the valve members 28, 29 are influenced by centrifugal forces which keep them constantly in their opening positions independent of the pressures in the pressure spaces 23 and 25. Thus, the passage 27 is kept open, which has the consequence that the difference between the pressures in the pressure spaces 23 and 25 is reduced, whereby the rotational speed of the rotor 20 is limited.
Figure 5 schematically shows a third embodiment of the sliding vane motor according to the invention, com¬ prising a housing 32, a rotor 33 in the housing 32, and three vanes 34, which are symmetrically arranged in the rotor 33. The housing 32, the rotor 33 and the vanes 34 form three pressure spaces 35-37. In the rotor 33 there is a passage 38 extending between all pressure spaces 35-37 and provided with three valve members 39.
Figure 6 schematically shows a fourth embodiment of the sliding vane motor according to the invention, which is identical to the embodiment according to figures 3a-3c, 4a-4c, except that the passage 40 of the rotor 20 branches off to all pressure spaces 23-26 and that the passage 40 is provided with two further valve members 41, 42, which are arranged in the branches of the passage 40 which open into the pressure spaces 24 and 26, respectively.

Claims

Claims
1. A sliding vane motor comprising a housing (1; 19; 32) forming a cylindrical rotor chamber (2), a rotor (3; 20; 33) eccentrically arranged in the cylindrical rotor chamber, a plurality of vanes (4; 22; 34) arranged radially displaceably in the rotor, the housing, the vanes and the rotor forming a plurality of pressure spaces (5-8; 23-26; 35-37) sealed from each other and distributed in series around the circumference of the rotor, the volume of each pressure space being varied during the operation of the sliding vane motor, when the pressure spaces by means of the vanes are rotated in the rotor chamber, an inlet (9; 30) for the supply of air to the rotor chamber at a first pressure, and an outlet
(10; 31) for the discharge of air from the rotor chamber at a second pressure, which is lower than the first pressure,
c h a r a c t e r i z e d i n
that a passage (11; 27; 38; 40) extends through the rotor (3; 20; 33) between at least a first and a second of said pressure spaces (5-8; 23-26; 35-37) and that a valve device (12, 13, 17, 18; 28, 29; 39; 41, 42) is adapted to keep the passage closed, when the rotational speed of the rotor is less than a predetermined value, and to keep the passage open, when the rotational speed of the rotor amounts to at least said predetermined value.
2. A sliding vane motor according to claim 1, c h a ¬ r a c t e r i z e d i n that the first and second pressure spaces (5, 7; 6, 8; 23, 25; 24, 26) are situated at substantially diametrically opposite sides of the rotor (3; 20; 33).
3. A sliding vane motor according to claim 1 or 2, c h a r a c t e r i z e d i n that the valve device (12, 13, 17, 18; 28, 29; 39; 41, 42) is controlled by the pressures in the first and second pressure spaces (5-8; 23-26; 35-37) such that the valve device keeps the passage closed, when said pressures differ from one another and the rotational speed of the rotor is less than said predetermined value.
4. A sliding vane motor according to claim 3, c h a ¬ r a c t e r i z e d i n
that the valve device comprises a first valve member (12; 29) and a second valve member (13; 28), which both are freely movable in the passage (11; 27) between respective closing positions, in which the valve members keep the passage closed, and respective opening positions, in which the valve members keep the passage open,
that the first valve member (12; 29) is adapted to be forced against its closing position under the influence of the pressure in the first pressure space (6; 25), when this pressure exceeds the pressure in the second pressure space (8; 23),
- that the second valve member (13; 28) is adapted to be forced against its closing position under the influence of the pressure in the second pressure space (8; 23) , when this pressure exceeds the pressure in the first pressure space (6; 25), and that the first and second valve members (12; 39 and 13; 28, respectively) are adapted to be brought against their respective opening positions under the influence of centrifugal force independent of the prevailing pressures in the pressure spaces, when the rotational speed of the rotor amounts to at least said predetermined value.
5. A sliding vane motor according to any of claims 1-4, c h a r a c t e r i z e d i n that said passage (38) extends between a third pressure space (35) and said first and second pressure spaces (36, 37), the valve device (39) being adapted to keep the passage closed, when the pressures in at least two of the first, second and third pressure spaces (35-37) differ from one another and the rotational speed of the rotor is less than said predetermined value.
6. A sliding vane motor according to claim 5, c h a - r a c t e r i z e d i n that said passage extends between a fourth pressure space (24) and said first, second and third pressure spaces (23, 25, 26), the valve device (28, 29, 41, 42) being adapted to close the passage (40), when the pressures in at least two of the first, second, third and fourth pressure spaces (23-26) differ from one another and the rotational speed of the rotor is less than said predetermined value.
7. A sliding vane motor according to claim 6, c h a - r a c t e r i z e d i n that the first, second, third and fourth pressure spaces (23-26) are evenly distributed around the rotor.
8. A sliding vane motor comprising a housing (1 ), forming a cylindrical rotor chamber (2), a rotor (3) eccentrically arranged in the cylindrical rotor chamber, a plurality of vanes (4) arranged radially displaceably in the rotor, the housing, the vanes and the rotor forming a plurality of pressure spaces (5-8) sealed from one another and distributed in series around the circum¬ ference of the rotor, the volume of each pressure space being varied during the operation of the sliding vane motor, when the pressure spaces by means of the vanes are rotated in the rotor chamber, an inlet (9) for the supply of air to the rotor chamber at a first pressure, and an outlet ( 10) for the discharge of air from the rotor chamber at a second pressure, which is lower than the first pressure,
c h a r a c t e r i z e d i n
that a first passage (11) extends through the rotor (3) between a first (6) and a second (8) of said pressure spaces,
that a first valve device (12, 13, 17, 18) is adapted to keep the first passage (11) closed, when the rotational speed of the rotor is less than a pre¬ determined value, and to keep the first passage open, when the rotational speed of the rotor amounts to at least said predetermined value,
that a second passage (14) extends through the rotor (3) between a third ( 5) and a fourth (7) of said pressure spaces, and
that a second valve device (15-18) is adapted to keep the second passage (14) closed, when the rotational speed of the rotor is less than said predetermined value, and to keep the second passage open, when the rotational speed of the rotor amounts to at least said predetermined value.
9. A sliding vane motor according to claim 8, c h a - r a c t e r i z e d i n that the first, second, third and fourth pressure spaces (5-8) are evenly distributed around the rotor (3 ) with the first pressure space ( 6 ) situated right opposite to the second pressure space (8) and the third pressure space (5) situated right opposite to the fourth pressure space (7) .
10. A sliding vane motor according to claim 8 or 9, c h a r a c t e r i z e d i n that the first valve device (12, 13, 17, 18) is controlled by the pressures in the first and second pressure spaces (6, 8) such that the first valve device keeps the first passage (11) closed, when said pressures differ from one another and the rotational speed of the rotor is less than said pre¬ determined value, and that the second valve device (15-18) is controlled by the pressures in the third and fourth pressure spaces (5, 7) such that the second valve device keeps the second passage (14) closed, when the last mentioned pressures differ from one another and the rotational speed of the rotor is less- than said pre- determined value.
11. A sliding vane motor according to claim 10, c h a r a c t e r i z e d i n
- that the first valve device comprises a first valve member (12) and a second valve member (13), which both are freely movable in the first passage (11) between respective closing positions, in which the valve members keep the first passage closed, and respective opening positions, in which the valve members keep the first passage open,
that the first valve member (12) is adapted to be forced against its closing position under the influence of the pressure in the first pressure space ( 6 ) , when this pressure exceeds the pressure in the second pressure space (8 ) ,
- that the second valve member ( 13 ) is adapted to be forced against its closing position under the influence of the pressure in the second pressure space (8), when this pressure exceeds the pressure in the first pressure space ( 6 ) ,
that the second valve device comprises a third valve member (15) and a fourth valve member (16), which both are freely movable in the second passage ( 14) between respective closing positions, in which the third and fourth valve members keep the second passage closed, and respective opening positions, in which the third and fourth valve members keep the second passage open,
- that the third valve member (15) is adapted to be forced against its closing position under the influence of the pressure in the third pressure space ( 5) , when this pressure exceeds the pressure in the fourth pressure space (7),
that the fourth valve member (16) is adapted to be forced against its closing position under the influence of the pressure in the fourth pressure space (7), when this pressure exceeds the pressure in the third pressure space (5), and that the first, second, third and fourth valve members (12, 13, 15, 16) are adapted to be brought against their respective opening positions under the influence of centrifugal force independent of the prevailing pressures in the pressure spaces (5-8), when the rotational speed of the rotor amounts to at least said predetermined value.
12. A sliding vane motor according to claim 4 or 11, c h a r a c t e r i z e d i n that each valve member (12, 13, 15, 16, 28, 29, 39, 41, 42) seals in its closing position against a valve seating ( 17 ) formed by the rotor and extending around the passage in which the valve member is freely movable.
13. A sliding vane motor according to any of claims 4, 11 and 12, c h a r a c t e r i z e d i n that each valve member (12, 13, 15, 16, 28, 29, 39, 41, 42) abuts against a stop member (18) connected to the rotor, when the valve member is in its opening position.
14. A sliding vane motor according to any of claims 4, 11-13, c h a r a c t e r i z e d i n that each valve member (12, 13, 15, 16, 28, 29, 39, 41, 42) com- prises a spherical body.
15. A sliding vane motor according to claim 12, c h a r a c t e r i z e d i n that the spherical body is solid.
PCT/SE1994/000809 1993-09-16 1994-09-02 Sliding vane motor WO1995008047A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU77122/94A AU7712294A (en) 1993-09-16 1994-09-02 Sliding vane motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9303023-7 1993-09-16
SE9303023A SE501780C2 (en) 1993-09-16 1993-09-16 Slat motor with head guard

Publications (1)

Publication Number Publication Date
WO1995008047A1 true WO1995008047A1 (en) 1995-03-23

Family

ID=20391119

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/000809 WO1995008047A1 (en) 1993-09-16 1994-09-02 Sliding vane motor

Country Status (3)

Country Link
AU (1) AU7712294A (en)
SE (1) SE501780C2 (en)
WO (1) WO1995008047A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006119574A1 (en) * 2005-05-12 2006-11-16 Norman Ian Mathers Improved vane pump
ITRM20110492A1 (en) * 2011-09-21 2013-03-22 Giampiero Fidotti MOTORE MOSSO FROM THE SUFFICIENT ATMOSPHERIC PRESSURE DIFFERENCE TO OPERATE AN ELECTRIC CURRENT GENERATOR.
US10788112B2 (en) 2015-01-19 2020-09-29 Mathers Hydraulics Technologies Pty Ltd Hydro-mechanical transmission with multiple modes of operation
US11085299B2 (en) 2015-12-21 2021-08-10 Mathers Hydraulics Technologies Pty Ltd Hydraulic machine with chamfered ring
US11168772B2 (en) 2009-11-20 2021-11-09 Mathers Hydraulics Technologies Pty Ltd Hydrostatic torque converter and torque amplifier
US11255193B2 (en) 2017-03-06 2022-02-22 Mathers Hydraulics Technologies Pty Ltd Hydraulic machine with stepped roller vane and fluid power system including hydraulic machine with starter motor capability

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260343A (en) * 1979-01-29 1981-04-07 Robert Bosch Gmbh Vane compressor
SE468738B (en) * 1991-06-28 1993-03-15 Alfa Laval Agri Int DEVICE FOR AUTOMATIC REMOVAL OF THE MILKING ORGAN

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260343A (en) * 1979-01-29 1981-04-07 Robert Bosch Gmbh Vane compressor
SE468738B (en) * 1991-06-28 1993-03-15 Alfa Laval Agri Int DEVICE FOR AUTOMATIC REMOVAL OF THE MILKING ORGAN

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8597002B2 (en) 2003-07-15 2013-12-03 Mathers Hydraulics Pty. Ltd. Hydraulic machine with vane retaining mechanism
US9638188B2 (en) 2003-07-15 2017-05-02 Mathers Hydraulics Technologies Pty Ltd Hydraulic machine with vane retaining mechanism
WO2006119574A1 (en) * 2005-05-12 2006-11-16 Norman Ian Mathers Improved vane pump
US7955062B2 (en) 2005-05-12 2011-06-07 Norman Ian Mathers Vane pump
US11168772B2 (en) 2009-11-20 2021-11-09 Mathers Hydraulics Technologies Pty Ltd Hydrostatic torque converter and torque amplifier
ITRM20110492A1 (en) * 2011-09-21 2013-03-22 Giampiero Fidotti MOTORE MOSSO FROM THE SUFFICIENT ATMOSPHERIC PRESSURE DIFFERENCE TO OPERATE AN ELECTRIC CURRENT GENERATOR.
US10788112B2 (en) 2015-01-19 2020-09-29 Mathers Hydraulics Technologies Pty Ltd Hydro-mechanical transmission with multiple modes of operation
US11085299B2 (en) 2015-12-21 2021-08-10 Mathers Hydraulics Technologies Pty Ltd Hydraulic machine with chamfered ring
US11255193B2 (en) 2017-03-06 2022-02-22 Mathers Hydraulics Technologies Pty Ltd Hydraulic machine with stepped roller vane and fluid power system including hydraulic machine with starter motor capability

Also Published As

Publication number Publication date
SE501780C2 (en) 1995-05-15
AU7712294A (en) 1995-04-03
SE9303023D0 (en) 1993-09-16
SE9303023L (en) 1995-03-17

Similar Documents

Publication Publication Date Title
CA2068776C (en) Scroll type fluid displacement apparatus having a capacity control mechanism
EP0373269B1 (en) Scroll type compressor with variable displacement mechanism
EP0777052B1 (en) Scroll compressor capacity control valve
CN102449313B (en) Compressor having piston assembly
EP0297840B1 (en) Scroll type compressor with variable displacement mechanism
EP0043701B1 (en) Capacity control for a scroll-type fluid displacement apparatus
ES2370314T3 (en) SPIRAL MACHINE WITH CAPACITY MODULATION.
US4744733A (en) Scroll type compressor with variable displacement mechanism
EP0256624A2 (en) Variable capacity vane compressor
JPS6220688A (en) Vane type compressor
JPS5928083A (en) Scroll type compressor
SE457902B (en) FLUID COMPRESSOR OF SPIRAL WHEEL TYPE WITH MECHANISM BEFORE SETTING THE DEPLACEMENT
US5285536A (en) Wave generating system
US4990060A (en) Air pump with secondary air inlet
WO1995008047A1 (en) Sliding vane motor
EP0225126A1 (en) Variable capacity vane compressor
JPS6357889A (en) Rotary type compressor
US6422846B1 (en) Low pressure unloader mechanism
EP0754862B1 (en) A fluid displacement apparatus with variable displacement mechanism
GB2176537A (en) Adjusting the vanes in a vane pump between operative and idle positions
US5074769A (en) Compressor having an orbital rotor with parallel linkage and spring biased vanes
SE455116B (en) SPIRAL WHEEL TYPE FLUID COMPRESSOR
JPH0772553B2 (en) Vane compressor
GB2158881A (en) Rotary vane compressor
JPH0133675B2 (en)

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AM AU BB BG BR BY CA CN CZ FI GE HU JP KG KP KR KZ LK LT LV MD MG MN NO NZ PL RO RU SI SK TJ TT UA US UZ VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE MW SD AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA