WO2008095606A1

WO2008095606A1 - Reciprocating piston machine

Info

Publication number: WO2008095606A1
Application number: PCT/EP2008/000512
Authority: WO
Inventors: Pedro Gomez; Jan Hinrichs; Tilo SCHÄFER
Original assignee: Ixetic Mac Gmbh
Priority date: 2007-02-07
Filing date: 2008-01-24
Publication date: 2008-08-14
Also published as: DE112008000184A5

Abstract

Reciprocating piston machine, in particular a pivoting-ring or pivoting-disc compressor, having pistons which are accommodated in cylinder chambers such that they can move to and fro and are driven by a drive device which is adjustable, in order to modify the delivery capacity. At least one cylinder chamber and/or its associated technical features have/has a modification or modifications with respect to the other cylinder chambers, which modification or modifications serves/serve to disrupt, to disturb and/or to interrupt a uniform pressure force profile in a targeted manner during operation of the reciprocating piston machine.

Description

reciprocating engine

The invention relates to a reciprocating piston engine, in particular a Schwenkring- or swash plate compressor, with pistons, which are received in cylinder chambers movable back and forth and driven by a drive device which is adjustable in order to change the flow rate.

Such a reciprocating engine is known from international patent application WO 99/24715. The drive device of the known reciprocating engine comprises a driven by a machine shaft swash plate whose inclination is adjustable to the machine shaft.

The object of the invention is, for example, resulting from disturbing tilting forces Verstellhysterese in a reciprocating engine, in particular a Schwenkring- or swash plate compressor, with pistons, which are reciprocally accommodated in cylinder chambers and driven by a drive device which is adjustable to the flow rate to change, to reduce.

The object is in a reciprocating piston engine, in particular a Schwenkring- or swash plate compressor, with pistons, which are received in cylinder chambers movable back and forth and driven by a drive device which is adjustable to change the flow rate, achieved in that the reciprocating engine at least one Change or changes, which serves or serve to specifically disturb a uniform pressure force curve during operation of the reciprocating engine, to worry and / or interrupt. As a result of the change or the changes, a targeted unrest or irregularity is introduced into the drive device in order to purposefully interrupt the uniform pressure force curve required for acoustic reasons and to allow easier adjustment of the drive device during a small time interval in which reduced forces act.

A preferred embodiment of the reciprocating engine is characterized in that the change or changes to at least one piston and / or at least one cylinder space is or are provided. The changes are exactly coordinated.

A further preferred embodiment of the reciprocating engine is characterized in that the reciprocating engine has at least one change or changes, which serves or purpose to disturb a uniform Saugdruckkraftverlauf and / or Kompressionsdruckkraftverlauf targeted during operation of the reciprocating engine, to worry and / or interrupt. The Saugdruckkraftverlauf and the compression pressure force curve are influenced by the drive device.

A further preferred exemplary embodiment of the reciprocating piston engine is characterized in that the reciprocating piston engine has at least one change or change which serves or purposefully raises or lowers the suction pressure in at least one cylinder space relative to the suction pressure in at least one other cylinder space and / or the remaining cylinder spaces , The changes are preferably provided on the cylinder wall bounding the cylinder space or on the piston arranged therein.

Another preferred exemplary embodiment of the reciprocating piston engine is characterized in that the reciprocating piston engine has at least one change or change which serves or purposefully raises or lowers the compression pressure in at least one cylinder space relative to the compression pressure in at least one other cylinder space and / or the remaining cylinder spaces , The changes are preferably provided on the cylinder wall bounding the cylinder space or on the piston arranged therein.

A further preferred embodiment of the reciprocating engine is characterized in that the reciprocating engine comprises a valve plate which limits the cylinder spaces and has suction holes which are associated with the individual cylinder chambers and of which at least one smaller or smaller compared to at least one other suction bore o- the other suction holes is. The suction holes are closed or closed, for example by spring tongues. A further preferred embodiment of the reciprocating engine is characterized in that at least one cylinder chamber is changed so that the changed cylinder chamber has a damaged volume, which is increased or decreased compared to at least one other cylinder chamber and / or the other cylinder chambers. As a result, the pressure force curve is influenced during operation of the reciprocating engine.

A further preferred embodiment of the reciprocating piston engine is characterized in that the at least one cylinder chamber has a recess which at least one other cylinder space and / or the other cylinder spaces or not in the same shape or size or have. The recess is, for example, a notch in an edge region of the cylinder chamber facing the valve plate.

A further preferred embodiment of the reciprocating engine is characterized in that at least one piston is changed so that the cylinder chamber in which the piston is arranged, has a damaged volume, which is increased or decreased compared to at least one other cylinder chamber or the other cylinder chambers. As a result, the pressure force curve is influenced during operation of the reciprocating engine.

A further preferred embodiment of the reciprocating engine is characterized in that the at least one piston has a recess which at least one other piston or the other piston or not in the same shape or size or have. The recess is, for example, a blind hole in the piston.

A further preferred embodiment of the reciprocating engine is characterized in that the cylinder chambers, in particular cylinder bores, are distributed unevenly over the circumference or have different diameters. By a variation of the arrangement of the cylinder chambers also an uneven flow of forces can be achieved. For example, at least one cylinder space can be de-axed in the tangential or radial direction. - A -

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

Figure 1 is an axial section through a conventional reciprocating engine ^' ;

Figure 2 is a perspective view of a valve plate of an inventive

reciprocating engine;

Figure 3 is a perspective view of a housing body with cylinder chambers of a reciprocating piston engine according to the invention;

Figure 4 shows a piston of a reciprocating piston engine according to the invention in longitudinal section and

Figure 5 shows a housing body with cylinder chambers in the plan view according to another embodiment.

FIG. 1 shows an axial section of a conventional reciprocating piston engine as disclosed in international patent application WO 99/24715. The reciprocating engine 1 has, for example seven pistons 2, which are arranged side by side in the circumferential direction of the machine and are guided in cylinder bores 3 of the machine housing. The lifting movement of the piston 2 is effected by the engagement of an annular disc 6 extending obliquely to the machine shaft 5 into an engagement chamber 7, which is provided adjacent to the closed cavity 8 of the piston 2. For an essentially play-free sliding engagement in each inclined position of the annular disk 6, ball segments 11, 12 are provided on both sides between it and the spherically curved inner wall 10 of the engagement chamber 7, so that the swash plate 6 slides between them during its circulation.

The drive transmission from the machine shaft 5 to the annular disk 6 takes place by means of a drive bolt 13 which is fastened in the machine shaft 5 and whose spherical head 15, for example, engages in a radial bore 16 of the annular disk 6. In this case, the position of the driver head 15 is selected so that its center 17 coincides with that of the ball of the body. gel segments 11, 12 matches. In addition, this center is located on a circular line that connects the geometric axes of the seven pistons together and further on a circular line that connects the centers of the spherical shape of the joint body 11, 12 of the piston 2. In this way, the dead center position of the piston 2 visible in the upper area of the representation of FIG. 1 is exactly determined and a minimal harmful space is ensured. The head shape of the free Mitnehmerendes allows the change in the inclination of the annular disc 6 by the driver head 15 forms a bearing body for the stroke of the piston 2 changing pivotal movement of the annular disc 6. The shape of the engaging space 16 and / or the head 15 of the driver 13 can be chosen differently to achieve a different kinematics. A valve plate 40 defines the cylinder chambers in which pistons are accommodated.

In Figure 2, the valve plate 40 is shown in perspective according to an embodiment of the invention. The valve plate 40 has the shape of a circular disc in which a plurality of through holes are recessed. The through holes are holes that are evenly distributed on two concentric pitch circles of different diameters. The holes on the radially outer circle are suction holes 41, 42, 43. The suction holes 41 to 43 allow the passage of a medium when the associated piston perform a suction stroke in their cylinder chambers. Similarly, the unspecified pressure holes allow the passage of compressed medium when the piston perform a pressure stroke. According to one essential aspect of the invention, at least one of the suction bores 43 is made slightly smaller than the remaining suction bores 41, 42.

In Figure 3, a housing body 50 of a reciprocating piston engine according to the invention is shown in perspective. The housing body 50 comprises five cylinder chambers 51 to 55, which are arranged distributed uniformly on a pitch circle. The cylinder chambers 51 to 55 are bores. Therefore, the cylinder chambers 51 to 55 are also referred to as cylinder bores. Each cylinder chamber 51 to 55 serves to receive a piston (not shown in FIG. 3). The cylinder chambers 51, 53, 54, 55 each have the same volume. The volume of the cylinder chamber 52 is selectively increased by a recess 58. As a result, the harmful volume or dead volume of the cylinder chamber 52 is artificially increased compared to the other cylinder chambers. 4 shows a piston 60 of a reciprocating piston engine according to the invention is shown in longitudinal section. The piston 60 comprises a piston main body 61, which has substantially the shape of a right circular cylinder. At one end of the piston body 61, a substantially U-shaped holder 64 is attached. The holder 64 serves to couple the piston 60 with a drive device (not shown in FIG. 4), in particular a swivel disk. In the region of the other end of the piston main body 61, two piston seals 66, 67 are indicated, which are arranged in annular grooves of the piston main body 61.

According to a further aspect of the invention, the piston 60 has a central recess 70 at its end facing away from the holder 64. The recess 70 is designed as a blind hole and serves to artificially increase the harmful volume of a cylinder chamber in which the piston 60 is arranged. Alternatively, it is also possible to carry out the piston 60 somewhat shorter than the other pistons.

FIG. 5 shows a housing body 80 of a reciprocating piston engine according to the invention in plan view. The housing body 80 includes five cylinder chambers 81 to 85, which are arranged distributed uniformly on a pitch circle 86. The cylinder chambers 81 to 85 are bores. Therefore, the cylinder chambers 81 to 85 are also referred to as cylinder bores. Each cylinder chamber 81 to 85 serves to receive a piston. The cylinder chambers 81 to 85 each have the same volume. An arrow 91 indicates that the cylinder bore 82 can be de-axed in the tangential direction. By a further arrow 92 it is indicated that the cylinder bore 82 can also be dismantled in the radial direction. De-Axierung means that the axis of the cylinder bore 82 is selectively displaced away in a tangential or radial direction of the pitch circle 86. This will change the stroke of the associated piston. When displaced radially outward, the stroke increases. With a displacement radially inward, the stroke decreases. Due to the targeted de-Axierung of at least one cylinder chamber an otherwise uniform pressure force curve is specifically disturbed or disturbed during operation of the reciprocating engine. LIST OF REFERENCES

1. Reciprocating engine 70th recess

2nd piston 80th housing body

3. Cylinder bores 81. Cylinder space

5. Machine shaft 82. Cylinder space

6. annular disc 83. cylinder space

7. engagement chamber 84. cylinder space

8. Cavity 85. Cylinder space

10. Inner wall 86th circle

11. Ball segment 91. arrow

12. Ball segment 92. arrow

13. driving pin

15. spherical head

16. Intervention room

17th center

40. Valve plate

41. Suction hole

42. Suction bore

43. Suction hole

50. Housing body

51. cylinder space

52. cylinder space

53. cylinder space

54. cylinder space

55. Cylinder space 58. Recess

60th piston

61. Piston body 64. Holder

66. Piston seal

67. Piston seal

Claims

claims

1. Reciprocating piston engine, in particular Schwenkring- or swash plate compressor, with pistons (2; 60), which are received in cylinder chambers (3; 51-55; 81-85) movable back and forth and driven by a drive device (6) which is adjustable in order to change the delivery rate, characterized in that the reciprocating engine has at least one change or changes (43; 58; 70) which serves or purposefully disturbs, disturbs and / or increases a uniform pressure force curve during operation of the reciprocating piston engine interrupt.

2. Reciprocating piston engine according to claim 1, characterized in that the change or changes to at least one piston (60) and / or at least one cylinder chamber (52) is or are provided.

3. Reciprocating piston engine according to one of the preceding claims, characterized in that the reciprocating piston engine has at least one change or changes (43, 58; 70) which serve or purposefully disturb a uniform suction pressure force curve and / or compression pressure force curve during operation of the reciprocating piston engine, to worry and / or interrupt.

4. Reciprocating piston engine according to one of the preceding claims, in particular according to claim 3, characterized in that the reciprocating engine at least one change or changes (43; 58; 70), which serves or serve, the suction pressure in at least one cylinder chamber (52) opposite specifically raise or lower the suction pressure in at least one other cylinder chamber (51) and / or the remaining cylinder chambers (53-55).

5. Reciprocating piston engine according to one of the preceding claims, in particular according to claim 3, characterized in that the reciprocating engine at least one change or changes (43; 58; 70) which serves or serve, the compression pressure in at least one cylinder chamber (52) opposite selectively raise or lower the compression pressure in at least one other cylinder chamber (51) and / or the remaining cylinder chambers (53-55).

6. Reciprocating piston engine according to one of the preceding claims, in particular according to claim 4 or 5, preferably according to claim 4, characterized in that the reciprocating piston engine comprises a valve plate (40) which delimits the cylinder chambers (51-55) and suction bores (41-43) has, which are associated with the individual cylinder chambers (51-55) and of which at least one is reduced or enlarged compared to at least one other suction bore or the remaining suction holes.

7. A reciprocating engine according to one of the preceding claims, in particular according to claim 3, characterized in that at least one cylinder chamber (52) is changed so that the changed cylinder chamber has a harmful volume, compared to at least one other cylinder chamber (51) and / or the rest Cylinder spaces (53-55) is increased or decreased.

8. A reciprocating engine according to claim 7, characterized in that the at least one cylinder chamber (55) has a recess (58), the at least one other cylinder space (51) and / or the remaining cylinder chambers (53-54) not or not in the same Have or have shape or size.

9. Reciprocating piston engine according to one of the preceding claims, in particular according to claim 3, characterized in that at least one piston (60) is changed so that the cylinder chamber (51-55), in which the piston (60) is arranged, has a damaged volume which is enlarged or reduced in relation to at least one other cylinder space or the remaining cylinder spaces.

10. Reciprocating piston engine according to claim 8, characterized in that the at least one piston (60) has a recess (70) which at least one other piston or the other piston or not in the same shape or size or have.

1 1. A reciprocating engine according to one of the preceding claims, in particular according to claim 1, characterized in that the cylinder chambers (81-85), in particular the cylinder bores, are distributed unevenly over the circumference or have different diameters.