Rotary pump with regulating structure spring with biasing action wire

Abstract

Rotary pump with adjustable delivery volume comprising a pump housing with a delivery chamber having a delivery chamber inlet for a fluid to be delivered in a low pressure region and a delivery chamber outlet for the fluid in a high pressure region, a delivery member for delivering the fluid, which can be rotated in the delivery chamber about a rotation axis, an adjustment structure which can be moved back and forth in the pump housing relative to the delivery member along an adjustment direction and against the adjustment direction for adjusting the delivery volume of the rotary pump, which has an inner contour which bounds the delivery chamber radially on the outside, adjustment means for generating an adjustment force acting on the adjustment structure along the adjustment direction, a restoring spring for exerting a restoring force acting on the adjustment structure against the adjustment direction, an additional spring for exerting an additional force acting on the adjustment structure along or against the adjustment direction, wherein the additional force intersects the rotation axis at a lever arm distance.

Description

Technical Field

[0001] This invention relates to a rotary pump, preferably a vane pump, with adjustable delivery capacity for supplying fluid to machine units. The fluid is preferably oil for machine units (e.g., for transmissions or engines in motor vehicles). The rotary pump includes a pump housing with a delivery chamber having a low-pressure region and a high-pressure region. The delivery chamber has a delivery chamber inlet for the fluid to be delivered in the low-pressure region and a delivery chamber outlet for the fluid in the high-pressure region. Further, the rotary pump includes a delivery member for delivering the fluid, which is rotatable about a rotational axis within the delivery chamber, the rotation of which draws the fluid through the delivery chamber inlet into the delivery chamber and discharges it through the delivery chamber outlet. Background Technology

[0002] Rotary pumps are preferably crankshaft pumps, meaning they are preferably mounted directly on the crankshaft of a machine unit, such as the crankshaft of a motor vehicle engine. Therefore, the pump speed of a crankshaft pump is equal to the speed of the crankshaft. Since the volumetric flow rate of the fluid to be pumped depends on the pump speed and may exceed the actual fluid demand if necessary, rotary pumps with adjustable delivery rates have been developed, where the delivery rate can be adjusted as needed. Such pumps are well known to those skilled in the art, which is why only a surface description of their structure will be given here.

[0003] Rotary pumps with adjustable delivery capacity typically include an adjusting structure, an adjusting device for generating an adjusting force acting on the adjusting structure, and a restoring device for generating a restoring force acting on the adjusting structure. Especially in the case of rotary pumps, internal forces are generated in the delivery chamber during pump operation. These internal forces act on the adjusting structure and may negatively affect the pump's adjusting behavior.

[0004] For example, internal forces may be generated due to the fluid pressure present in the conveying chamber and / or due to the friction of the conveying components. For example, internal forces may cause unexpected contact changes in the regulating structure, i.e., may unintentionally increase or decrease the conveying rate, and / or generate torques acting on the regulating structure and causing contact changes in the regulating structure and / or negatively impact the service life of the regulating structure.

[0005] Specifically, due to the increased clamping force, the torque acting on the regulating structure may additionally load the sliding surfaces and / or stops of the regulating structure, thereby promoting wear. It is also possible that the torque acting on the regulating structure reduces the clamping force acting on the sliding surfaces that are sealingly abutting each other between the regulating structure and the pump housing. This can cause the sliding surfaces to push apart, thus reducing the sealing effect of the sliding surfaces.

[0006] Especially in the case of vane pumps, frictional torque is generated by the friction of the vane tips on the regulating structure radially outward around the delivery chamber. This frictional torque can, for example, negatively affect the regulating behavior of the pump and / or generally promote wear on the regulating structure and / or the pump. The generated frictional torque is the torque acting on the regulating structure along the rotational direction of the delivery component. For example, this internal torque can cause excessive load on the sliding surface of the translationally movable regulating structure, thereby increasing wear.

[0007] Especially in the case of vane pumps with adjustable sliding structures, frictional torque increases the clamping force on some sliding surfaces while decreasing the clamping force on others. This can lead to increased wear or reduced sealing performance on the corresponding sliding surfaces, depending on whether the clamping force is increased or decreased.

[0008] In crankshaft pumps used in the automotive industry, the high rotational speed of the crankshaft can also achieve very high fluid pressures, resulting in significant internal forces and placing additional loads on the pump. High rotational speeds also lead to high frictional torque at the blade tips, especially in the case of vane pumps, where the blades are subjected to high centrifugal forces due to the high rotational speed. Summary of the Invention

[0009] Therefore, the object of the present invention is to provide a rotary pump that is insensitive to internal forces and / or torques.

[0010] The objective is achieved by an adjustable rotary pump comprising a restoring spring for applying a restoring force and an additional spring for applying an additional force, the restoring force and the additional force acting on an adjusting structure, wherein the restoring force and the additional force generate a resultant external force that intersects the rotation axis at a distance from the resultant external force lever arm.

[0011] This invention relates to rotary pumps with adjustable delivery capacity, particularly vane pumps, pendulum pumps, or gear pumps. The rotary pump is preferably designed as a crankshaft pump and is preferably directly driven by the crankshaft of the machine unit, i.e., the delivery component of the rotary pump is directly connected to or mounted on the crankshaft. If the rotary pump is a crankshaft pump, the rotational speed of the delivery component corresponds to the rotational speed of the crankshaft. In a crankshaft pump, the transmission ratio between the delivery component and the crankshaft is 1:1.

[0012] The rotary pump is preferably a crankshaft pump used in automobiles for conveying oil. In alternative embodiments, the rotary pump may also be designed as a pump with gear drive, toothed belt drive, or chain drive.

[0013] The rotary pump includes a pump housing with a delivery chamber having a delivery chamber inlet for the fluid to be delivered in a low-pressure region and a delivery chamber outlet for the fluid in a high-pressure region. The pump housing is preferably designed as a multi-part unit and includes at least one housing tank and a housing cover.

[0014] The inlet and / or outlet of the delivery chamber are preferably designed as suction kidneys and / or pressure kidneys. The inlet and / or outlet are preferably formed in the pump housing, particularly in the housing tank. Alternatively or additionally, the inlet and / or outlet may be formed in the radial outer boundary of the delivery chamber, for example, in the form of an interruption and / or recess, such as in a regulating structure. The fluid to be delivered is preferably oil for machine units, particularly for automobile transmissions or engines.

[0015] In the delivery chamber, the rotary pump has a delivery member that rotates about a rotation axis to deliver fluid. In a preferred embodiment, the rotary pump is a vane pump, wherein the delivery member has a delivery rotor and at least one vane movably supported in the delivery rotor. In alternative embodiments, the pump is a swashplate pump or a gear pump, particularly an internal gear pump. If the rotary pump is a crankshaft pump, the delivery rotor is preferably mounted on the crankshaft.

[0016] To regulate the delivery rate, the rotary pump includes an adjustment structure within the pump housing that can move back and forth relative to the delivery member along and against the adjustment direction. This adjustment structure has an internal profile that defines the delivery chamber radially outward. The internal profile of the adjustment structure is preferably designed to be circular. In alternative implementations, the internal profile may also be designed, for example, elliptical, particularly elliptical. The center point of the internal profile of the adjustment structure and the axis of rotation of the delivery member are preferably offset from each other, wherein the eccentricity preferably decreases as the delivery rate decreases.

[0017] The adjustment structure can also consist of an adjustment ring that surrounds the delivery chamber radially outward. The delivery chamber is preferably defined by the pump housing at its axial end face.

[0018] Preferably, the regulating structure in the pump housing can move back and forth in a translational manner along and against the regulating direction, particularly in a linearly guided translational manner. In an alternative embodiment, the regulating structure can also be pivotally movable within the pump housing along and against the regulating direction. Movement of the regulating structure along the regulating direction preferably results in pump regulation, i.e., a reduction in the flow rate. Therefore, movement of the regulating structure against the regulating direction preferably results in an increase in the flow rate.

[0019] To adjust the adjusting structure along the adjusting direction, the rotary pump includes an adjusting device for generating an adjusting force acting on the adjusting structure in the adjusting direction. The adjusting force preferably acts along the direction of minimum delivery.

[0020] The regulating force can be permanently applied to the regulating structure or can be generated to regulate the flow rate. The regulating force can have a constant or variable magnitude. Furthermore, the regulating force can consist of multiple components, in which case, for example, one component can be permanently applied to the regulating structure, while another component can be connected (zuschalten). If the regulating force consists of multiple components, one component can be constant, for example, while another component can have a variable magnitude, for example.

[0021] The regulating force can be generated, for example, by a fluid, especially a high-pressure fluid, acting on the regulating surface of the regulating structure. The rotary pump, and particularly the regulating device, may include one or more fluid regulating chambers permanently or optionally connected to the high-pressure region of the delivery chamber to permanently or optionally apply fluid pressure to the regulating surface of the regulating structure along the regulating direction. The regulating surface of the regulating structure is preferably loaded, especially permanently, by the high-pressure fluid on the high-pressure side of the pump. The pressurized fluid can be diverted from the outlet of the delivery chamber and supplied directly or, for example, via a control valve to the regulating surface of the regulating structure.

[0022] As a supplement to or alternative to applying high-pressure fluid to the regulating surface, a regulating spring may, for example, act on the regulating surface along the regulating direction. Alternatively, the regulating force may be generated, for example, by an externally regulating actuator. Those skilled in the art are familiar with regulating devices for adjusting the pump's delivery rate, particularly mechanisms for generating regulating motion, which is why they will not be discussed further here.

[0023] In addition to the adjusting device, the rotary pump may also include a restoring spring for applying a restoring force acting on the adjusting structure in the opposite direction to the adjusting direction. The restoring force preferably counteracts the adjusting force. The restoring force preferably acts in the direction of maximum delivery.

[0024] Restoring force can be achieved at a distance d R The rotation axis R of the cross-conveying member acts radially relative to the inner contour onto the adjusting structure. In a preferred embodiment, the restoring spring acts radially relative to the inner contour along the rotation axis of the conveying member onto the adjusting structure.

[0025] If the restoring force is at a distance d R If the axis of rotation of the cross conveyor component is at a distance d, then... R Preferably, the internal width is at most 40%, and particularly at most 30%, of the internal profile measured radially to the axis of rotation. The internal width is preferably measured perpendicular to the adjustment direction. The internal width of the internal profile is preferably understood as the maximum extension of the internal profile transverse to the adjustment direction. For a circular internal profile, the internal width corresponds to the diameter of the internal profile. That is, in the case of a circular internal profile, the distance d of the restoring force... RIt is at most 40% of the diameter of the inner contour, preferably at most 30%.

[0026] The restoring spring is preferably formed of a helical compression spring. In alternative embodiments, the restoring spring may also be made of a leaf spring, disc spring, hollow rubber spring, or similar material. When the restoring spring is a helical compression spring, it can be a cylindrical or non-cylindrical helical compression spring, such as a cone spring, barrel spring, or hourglass spring.

[0027] The recovery spring is preferably arranged in the recovery space. The recovery space is preferably arranged in the pump housing and is fluidly connected to the low-pressure area of ​​the delivery chamber. The recovery space is preferably arranged radially opposite to the fluid regulating chamber of the regulating device in the pump housing on the regulating structure. The recovery space is preferably arranged radially opposite to the fluid regulating chamber of the regulating device in the pump housing along the regulating direction.

[0028] Furthermore, the rotary pump may include an additional spring for applying an additional force to the adjusting structure along or against the adjusting direction. The additional force may act on the adjusting structure opposite to or in the direction of the adjusting force. The restoring force and the additional force may act parallel to each other on the adjusting structure. The additional force preferably acts relative to the adjusting direction.

[0029] The additional force can be permanently applied to the adjusting structure or additionally applied as a restoring or adjusting force. The additional force is preferably generated by an additional spring that is permanently applied to the adjusting structure. The additional spring is preferably formed of a helical compression spring that is permanently applied to the adjusting structure.

[0030] The additional force preferably crosses the axis of rotation R of the conveying member at a lever arm distance d. The lever arm distance d of the additional force is preferably at most 40%, and particularly at most 30%, of the inner width of the inner profile measured radially to the axis of rotation. The inner width is preferably measured perpendicular to the adjustment direction. This means that the inner width of the inner profile is preferably oriented perpendicular to the adjustment direction, and in particular, the inner width and the adjustment direction extend at right angles to each other.

[0031] The internal width of the inner contour is preferably understood as the maximum extension of the inner contour transverse to the adjustment direction. For a circular inner contour, the internal width corresponds to the diameter of the inner contour. That is, in the case of a circular inner contour, the lever arm distance d of the additional force is at most 40%, preferably at most 30%, of the diameter of the inner contour.

[0032] The additional spring is preferably formed of a helical compression spring. In alternative embodiments, the additional spring may also be made of a leaf spring, disc spring, hollow rubber spring, or similar material. When the additional spring is a helical compression spring, it can be a cylindrical or non-cylindrical helical compression spring, such as a cone spring, barrel spring, or hourglass spring.

[0033] The auxiliary spring and the restoring spring can have the same design. That is, both the restoring spring and the auxiliary spring can be formed, for example, by a helical compression spring. In alternative implementations, the restoring spring and the auxiliary spring can be designed differently. For example, the restoring spring can be made of a helical spring, while the auxiliary spring can be made of a leaf spring.

[0034] The supplementary spring can be disposed within the recovery space of the recovery spring or within an additional space. The additional space can be formed, for example, by a fluid regulating chamber of the regulating device. If the supplementary spring is disposed within the additional space, the additional space is preferably fluidly separated from the recovery space. The supplementary spring is preferably disposed perpendicular to the regulating direction and adjacent to the recovery spring in the recovery space.

[0035] If this application refers to forces acting along or against the adjustment direction, particularly restoring forces and / or additional forces, it can be understood to mean that at least one force component, particularly the largest force component, acts along or against the adjustment direction. The total force of the restoring spring and / or additional spring preferably acts along or against the adjustment direction.

[0036] The maximum force component of the restoring force and / or the additional force can act on the adjusting structure parallel to the adjusting direction or at an acute angle of less than 10° with the adjusting direction. Particularly preferably, the restoring force of the restoring spring and / or the additional force of the additional spring act on the adjusting structure only parallel to the adjusting direction or at an acute angle of less than 10° with the adjusting direction. That is, the restoring spring and / or the additional spring preferably each generate a resultant force that acts on the adjusting structure only parallel to the adjusting direction or at an acute angle of less than 10° with the adjusting direction.

[0037] The restoring force and the additional force can act on the adjusting structure at an acute angle to each other. In particular, the restoring force and the additional force can act on the adjusting structure at an angle of less than or equal to 20°, preferably less than or equal to 10°. That is, the lines of action of the restoring force and the lines of action of the additional force together form an angle of less than or equal to 20°, and particularly less than or equal to 10°.

[0038] The restoring force and the additional force preferably act on the adjusting structure substantially parallel to each other. This means that the restoring force and the additional force act on the adjusting structure at an angle of less than or equal to 5°. The restoring force and the additional force preferably act on the adjusting structure in parallel. This means that the lines of action of the additional force and the restoring force preferably extend parallel to each other and do not intersect.

[0039] Restoring forces and / or additional forces can act on the adjusting structure intersecting the internal contour. In the sense of this application, intersecting means that the lines of action of the additional forces and / or restoring forces intersect the curve of the internal contour at two points, particularly in a plane parallel to the end face of the adjusting structure, wherein the lines of action do not pass through the center point or central axis of the internal contour. Therefore, in the sense of this application, intersecting means that the lines of action of the additional forces and / or restoring forces form a secant line of the internal contour.

[0040] The internal profile of the adjusting structure has an internal width perpendicular to the adjusting direction, wherein the internal width is preferably measured radially relative to the axis of rotation. An additional force can be applied to the adjusting structure from the bisector B at a distance d from the lever arm measured transversely to the adjusting direction; this bisector divides the internal width into two equal segments. Furthermore, a restoring force can also be applied from the bisector B at a distance d transversely to the adjusting direction. R The effect is applied to the regulating structure.

[0041] The bisector B divides the conveying chamber into a high-pressure zone and a low-pressure zone. In the axial top view of the adjustment structure, the line of action of the restoring force preferably overlaps with the bisector B, such that the distance d transverse to the adjustment direction is... R The result is zero. If the line of action of the restoring force does not overlap with the bisector in the axial top view of the adjusting structure, the restoring force and the additional force preferably act transversely to the adjusting direction on the same side of the bisector B. Alternatively, the additional force and the restoring force can act on different sides of the bisector B transversely to the adjusting direction.

[0042] The restoring force can act radially toward the axis of rotation and / or the internal contour onto the adjusting structure or at a distance d. R The force intersects the axis of rotation at a distance less than the lever arm distance d, wherein the additional force intersects the axis of rotation. At least one of the forces from the additional force and the restoring force preferably acts on the adjusting structure secantly to the inner contour. The restoring force preferably acts radially to the axis of rotation, and the additional force acts on the adjusting structure secantly to the inner contour.

[0043] In the context of this application, radial to the inner contour means that the lines of action of the additional force and / or restoring force extend through the center point or central axis of the inner contour. That is, in the case of a circular or cylindrical inner contour, the lines of action of the additional force and / or restoring force overlap with the diameter of the inner contour. In the context of this application, radial to the axis of rotation means that the lines of action of the additional force and / or restoring force extend through the axis of rotation of the conveying member. If the eccentricity between the central axis of the inner contour and the axis of rotation is zero, i.e., the central axis of the inner contour and the axis of rotation overlap, then radial to the axis of rotation also means radial to the inner contour.

[0044] The additional force is preferably applied in the opposite direction of adjustment to the high-pressure section of the adjustment structure surrounding the conveying chamber, or alternatively, the additional force is applied in the direction of adjustment to the low-pressure section of the adjustment structure surrounding the conveying chamber.

[0045] The restoring force can act against the adjustment direction on the high-pressure section of the regulating structure surrounding the conveying chamber, or against the adjustment direction on the low-pressure section of the regulating structure surrounding the conveying chamber. Alternatively, the restoring force can also act in the opposite direction to the adjustment direction on the transition section between the high-pressure and low-pressure sections of the regulating structure surrounding the conveying chamber.

[0046] The restoring force can act radially or secantly on the regulating structure. The restoring force and the additional force can be the only external forces acting on the regulating structure, counteracting the regulating force. Particularly in the case of a rotary pump that does not include an additional spring, the restoring force is preferably the only external force acting on the regulating structure, counteracting the regulating force.

[0047] The additional force preferably generates a torque acting on the regulating structure. This torque is preferably directed in the opposite direction to the rotation of the conveying component, particularly during normal pump operation. That is, when the conveying component rotates clockwise during normal pump operation, the additional force preferably generates a counter-clockwise torque. Normal pump operation is understood here as operation provided by the pump's drive mechanism, particularly the rotation of the conveying component in the direction of rotation provided by the pump's drive mechanism. Essentially, normal pump operation means trouble-free pump operation.

[0048] The torque generated by the additional force preferably compensates, in whole or in part, for the torque generated by the friction of the conveying member and also acting on the adjusting structure. This has the advantage that the additional force can increase or decrease the clamping force acting on the various sliding surfaces of the adjusting structure and, if necessary, decrease or increase through the frictional torque of the conveying member. In other words, the additional force preferably reduces or compensates for the effect of the friction of the conveying member on the adjusting structure.

[0049] In other words, the additional force preferably prevents the sliding surfaces between the regulating structure and the pump housing, which are sealed against each other, from being pushed apart due to the decrease in the clamping force caused by the frictional torque, thereby reducing the sealing effect of the sliding surfaces, or from being subjected to increased friction due to the increased clamping force caused by the frictional torque, resulting in more wear.

[0050] In addition, the additional force can at least partially compensate for the torque generated by the adjusting force and / or restoring force, which acts on the adjusting structure.

[0051] Since the torque generated by the friction of the conveying member depends particularly on the rotational speed of the conveying member, the torque generated by the additional force is at least as large as the minimum torque generated by the conveying member during pump operation.

[0052] Alternatively or additionally, the restoring force can also generate a torque acting on the adjusting structure. The torque of the restoring force can be directed in a direction opposite to the rotational direction of the conveying member or can act in the rotational direction of the conveying member, especially during normal pump operation. The torque generated by the restoring force can fully or partially compensate for the torque generated by the friction of the conveying member and acting on the adjusting structure. Alternatively, the torque generated by the restoring force can amplify the torque generated by the friction of the conveying member and acting on the adjusting structure.

[0053] In particular, in the case where the rotary pump does not include an additional spring and the restoring spring is the only external force acting on the adjusting structure in the opposite direction to the adjusting direction, the torque generated by the restoring force can fully or partially compensate for the torque generated by the friction of the conveying member and acting on the adjusting structure.

[0054] Since the torque generated by the friction of the conveying member depends particularly on the rotational speed of the conveying member, the torque generated by the restoring force is at least as large as the minimum torque generated by the conveying member during pump operation in the case where the rotary pump does not include an additional spring.

[0055] The restoring force and the additional force are preferably introduced into the adjusting structure at a spring force distance D perpendicular to the adjusting direction with respect to each other. The spring force distance D can be equal to or greater than the lever arm distance d, where the additional force crosses the rotational axis of the conveying member, such that D ≥ d. The restoring force can act on the adjusting structure radially with respect to the rotational axis, such that the spring force distance D corresponds to the lever arm distance d at which the additional force crosses the rotational axis, i.e., D = d. In an alternative embodiment, the spring force distance D can be smaller (D < d) or larger (D > d) than the lever arm distance d. [[ID=1,4]]

[0056] The restoring force and the additional force can be different. The restoring force is preferably greater than the additional force, particularly preferably the restoring force is at least twice the additional force. The restoring force is preferably greater than the additional force at one or more positions that the adjusting structure can occupy within its range of movement along the adjusting direction and against the adjusting direction. The restoring force is preferably greater than the additional force at each position of the adjusting structure. [[ID=]16] [[ID=]17]

[0057] The restoring force and the additional force preferably have different magnitudes at one or more different positions that the adjusting structure can occupy within its range of movement along the adjusting direction and against the adjusting direction. Preferably, the restoring force and the additional force are different at each position of the adjusting structure. [[ID=2,0]]

[0058] The magnitude of the additional force is preferably selected based on the lever arm distance d. Preferably, the larger the lever arm distance d, the smaller the additional force, and vice versa. Conversely, if the lever arm distance d is small, the additional force can be larger.

[0059] The restoring spring may have a first spring constant, and the additional spring may have a second spring constant. The first spring constant of the restoring spring and the second spring constant of the additional spring may be different. For example, the first spring constant of the restoring spring may be greater than the second spring constant of the additional spring, meaning the restoring spring may be stiffer than the additional spring. Alternatively, the second spring constant of the additional spring may be greater than the first spring constant of the restoring spring.

[0060] The first spring constant of the restoring spring and the second spring constant of the auxiliary spring can be selected based on the spring force distance D. The second spring constant of the restoring spring is preferably selected taking into account the lever arm distance d.

[0061] The second spring constant of the additional spring should preferably be large enough to generate an additional force F. Z This additional force is large enough to compensate for the torque caused by friction from the conveying components. The second spring constant of the additional spring is preferably designed based on the lever arm distance d. When the lever arm distance d is large, the second spring constant of the additional spring can be small. Conversely, for a small lever arm distance d, the second spring constant of the additional spring is preferably large.

[0062] Furthermore, the first and / or second spring constants can be adapted to the application location and / or area of ​​the rotary pump. For example, in cases where the load on the rotary pump changes rapidly and / or there is significant vibration on the rotary pump, it is meaningful to select a smaller second spring constant for the additional spring to make the additional spring relatively soft.

[0063] Furthermore, the return spring can be assembled with a first preload and / or the additional spring can be assembled with a second preload. The first preload and the second preload can be different. For example, the first preload of the return spring can be greater than the second preload of the additional spring. Alternatively, the second preload of the additional spring can be greater than the first preload of the return spring.

[0064] Returning springs and auxiliary springs can have the same design in all characteristics, particularly shape, spring constant, spring characteristic curve, and preload. Alternatively, returning springs and helical springs can differ in one or more characteristics. For example, both returning springs and auxiliary springs can be helical compression springs with the same spring constant and the same spring characteristic curve, but assembled with different preloads.

[0065] Restoring force and additional force can together generate a net external force. The net external force generated by the restoring force and additional force can be generated at a distance d from the lever arm. AThe axis of rotation of the intersecting conveying components. The line of action of the resultant external force preferably extends intersecting the internal contour of the adjusting structure. Particularly preferably, the line of action of the resultant external force extends parallel to the adjusting direction.

[0066] The distance d of the lever arm of the net external force A The internal width is at most 30%, preferably at most 20%, of the radial width of the internal profile measured about the axis of rotation. The internal width is preferably measured perpendicular to the adjustment direction. The internal width of the internal profile is preferably understood as the maximum extension of the internal profile transverse to the adjustment direction. For a circular internal profile, the internal width corresponds to the diameter of the internal profile. That is, in the case of a circular internal profile, the lever arm distance d of the resultant external force... A It is at most 30% of the diameter of the inner contour, preferably at most 20%.

[0067] The resultant external force preferably acts on the high-pressure section of the regulating structure surrounding the conveying chamber. The resultant external force preferably acts relative to the regulating direction. The resultant external force can act on the regulating structure intersecting the internal contour.

[0068] The resultant external force preferably produces a torque acting on the regulating structure. The torque produced by the resultant external force can be directed in the opposite direction to the rotation of the conveying component, particularly during normal pump operation. Preferably, the torque produced by the resultant external force acts in the same direction as the torque produced by the additional force.

[0069] The torque generated by the net external force preferably compensates, in whole or in part, for the torque generated by friction of the conveying component and also acting on the adjusting structure. Furthermore, the net external force can compensate for the torque generated by the adjusting force and acting on the adjusting structure.

[0070] Since the torque generated by the friction of the conveying components depends in particular on the rotational speed of the conveying components, the torque generated by the net external force is at least as large as the minimum torque generated by the conveying components.

[0071] In a preferred embodiment, the adjusting structure has a stop that contacts one surface of the pump housing when the rotary pump's delivery rate is at its maximum. Therefore, the stop preferably restricts the translational movement of the adjusting structure relative to the adjusting direction.

[0072] The line of action of the resultant external force preferably passes through the stop of the adjusting structure, particularly if the line of action of the resultant external force passes centrally through the stop of the adjusting structure. Alternatively or additionally, the stop is formed between the line of action of the restoring force and the line of action of the additional force. The stop is preferably formed on the side of the adjusting structure opposite to the radial direction of the restoring spring, particularly on the side of the adjusting structure opposite to both the restoring spring and the additional spring.

[0073] The features of the invention are also described in the following aspects. Reference numerals in parentheses refer to examples of the invention's design shown in the following figures. They do not literally limit the features described in the aspects, but rather show preferred methods for implementing the respective features.

[0074] Aspect #1. Rotary pumps with adjustable delivery capacity include:

[0075] 1.1 Pump housing (1), the pump housing having a delivery chamber having a delivery chamber inlet (2) for the fluid to be delivered in a low-pressure region and a delivery chamber outlet (3) for the fluid in a high-pressure region.

[0076] 1.2 A conveying member for conveying fluid, said conveying member being rotatable about a rotation axis (R) within said conveying chamber.

[0077] 1.3 Adjustment structure (10), which is capable of translating back and forth in the pump housing (1) relative to the conveying member in the adjustment direction and in the opposite direction for adjusting the delivery volume of the rotary pump, the adjustment structure having an internal contour (I) that defines the delivery chamber in the radial direction.

[0078] 1.4 Used to generate an adjusting force (F) acting on the adjusting structure (10) along the adjusting direction. D Adjustment devices (30, 31) of )

[0079] 1.5 A restoring force (F) is applied to the adjusting structure (10) in the opposite direction of adjustment. R The recovery spring (11) of the )

[0080] 1.6 For applying an additional force (F) to the adjusting structure (10) along or against the adjusting direction. Z Additional spring (12) of )

[0081] 1.7 Among them, the additional force (F) Z The axis of rotation (R) intersects at the lever arm distance (d).

[0082] Aspect #2. The rotary pump according to the preceding aspect, wherein the additional force (F) Z ) and / or the restoring force (F) R The adjustment structure (10) is applied intersecting the inner contour (I).

[0083] Aspect #3. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) R ) and the additional force (F) Z The resultant external force (F) is generated. A The resultant external force (F)A ) at the lever arm distance (d A The axis of rotation (R) intersects at the point where the lever arm is at a distance (d). A In particular, the inner width (A) of the inner contour (I) measured radially to the axis of rotation (R) is at most 30%, preferably at most 20%, wherein the inner width (A) is preferably measured perpendicular to the adjustment direction.

[0084] Aspect #4. The rotary pump according to any one of the preceding aspects, wherein the additional force (F) Z The additional force (F) acts against the direction of adjustment on a section of the adjustment structure (10) surrounding the high-pressure area of ​​the delivery chamber, or wherein the additional force (F) acts against the direction of adjustment. Z The adjustment is applied along the adjustment direction to the section of the adjustment structure (10) surrounding the low-pressure area of ​​the delivery chamber.

[0085] Aspect #5. The rotary pump according to any one of the preceding aspects, wherein the additional force (F) Z This generates a torque that acts on the adjustment structure (10) and points in the opposite direction to the rotation of the conveying member.

[0086] Aspect #6. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) of the restoring spring (11) acting on the adjusting structure (10) R The additional force (F) exerted on the adjusting structure (10) by the additional spring (12) and / or the additional force (F) of the additional spring (12) Z It acts only parallel to the adjustment direction or at an acute angle of less than 10° to the adjustment direction.

[0087] Aspect #7. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) R ) and the additional force (F) Z The spring forces are guided to each other into the adjustment structure (10) by a distance (D) perpendicular to the adjustment direction.

[0088] Aspect #8. The rotary pump according to the preceding aspect, wherein the spring force distance (D) is equal to or greater than the lever arm distance (d).

[0089] Aspect #9. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) R The additional force (F) acts radially relative to the axis of rotation (R) onto the adjusting structure (10) or intersects the axis of rotation (R) at a distance less than the lever arm distance (d), wherein the additional force (F) Z ) intersects the axis of rotation (R).

[0090] Aspect #10. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) R ) greater than the additional force (F) Z ).

[0091] Aspect #11. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) R ) and the additional force (F) Z The adjustment structure (10) may occupy one or more different positions within the range of its movement along and against the adjustment direction, preferably having a different size at each position.

[0092] Aspect #12. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) R ) and the additional force (F) Z The resultant external force (F) that acts on the adjustment structure (10) in the opposite direction to the adjustment direction is generated. A ).

[0093] Aspect #13. The rotary pump according to the preceding aspect, wherein the adjusting structure (10) includes a stop (31) that contacts one surface of the pump housing (1) when the pump's delivery capacity is at its maximum, and wherein the resultant external force (F) A The line of action of the stop (31) passes through the stop.

[0094] Aspect #14. The rotary pump according to any one of the preceding two aspects, wherein the resultant external force intersects the rotation axis (R) at a distance, and the resultant external force acts against the adjustment direction on a section of the adjustment structure (10) surrounding the high-pressure region of the delivery chamber.

[0095] Aspect #15. The rotary pump according to any one of the preceding three aspects, wherein the resultant external force (F) A The internal contour (I) is intersected by the adjustment structure (10).

[0096] Aspect #16. The rotary pump according to any one of the foregoing four aspects, wherein the net external force (F) A This generates a torque that acts on the adjustment structure (10) and points in the opposite direction to the rotation of the conveying member.

[0097] Aspect #17. The rotary pump according to any one of the preceding aspects, wherein the adjusting structure (10) includes a stop (31) that contacts a surface of the pump housing (1) when the pump's delivery volume is at its maximum, and wherein the stop (31) is formed under restoring force (F) RThe line of action and additional force (F) Z Between the lines of action of ).

[0098] Aspect #18. The rotary pump according to any one of the preceding four aspects, wherein the resultant external force intersects the axis of rotation (R) at a distance less than the lever arm distance (d).

[0099] Aspect #19. The rotary pump according to any one of the preceding aspects, wherein the restoring spring (11) has a first spring constant and is assembled with a first preload, and the additional spring (12) has a second spring constant and is assembled with a second preload, wherein the first spring constant and the second spring constant are not equal and / or the first preload and the second preload are not equal.

[0100] Aspect #20. The rotary pump according to any one of the preceding aspects, wherein the adjustment structure (10) is linearly guided in translational manner along and against the adjustment direction.

[0101] Aspect #21. The rotary pump according to any one of the preceding aspects, wherein the restoring spring (11) and / or the additional spring (12) are helical compression springs.

[0102] Aspect #22. The rotary pump according to any one of the preceding aspects, wherein the recovery spring (11) and / or the additional spring (12) are disposed in the recovery space (20) in the low-pressure region of the pump housing.

[0103] Aspect #23. The rotary pump according to any one of the preceding aspects, wherein the regulating device (30) has one or more fluid regulating chambers, and the respective fluid regulating chambers are permanently or optionally connected to the high-pressure area of ​​the delivery chamber so as to permanently or optionally apply fluid pressure to the regulating structure (10) in the regulating direction.

[0104] Aspect #24. The rotary pump according to any one of the preceding aspects, wherein the restoring force (F) R ) and / or the additional force (F) Z ) is the only external force acting on the regulating structure (10), which counteracts the regulating force (F). D ).

[0105] Aspect #25. The rotary pump according to any one of the preceding aspects, wherein the inner profile (I) has an inner width (A) perpendicular to the adjustment direction, wherein the inner width (A) is preferably measured radially to the rotation axis (R), and the additional force (F) ZThe bisector (B) of the inner width (A) into two equal segments is applied to the adjustment structure (10) at a lever arm distance (d) measured transversely to the adjustment direction.

[0106] Aspect #26. The rotary pump according to any one of the preceding aspects, wherein the inner profile (I) has an inner width (A) perpendicular to the adjustment direction, wherein the inner width (A) is preferably measured radially to the rotation axis (R), and the restoring force (F) R The distance (d) is measured transversely to the adjustment direction by dividing the inner width (A) into two equal segments by the bisecting line (B). R The restoring force (F) acts on the regulating structure (10) at the location, or wherein the restoring force (F) R The line of action of the adjustment structure (10) overlaps with the bisector in the axial top view of the adjustment structure (10).

[0107] Aspect #27. The rotary pump according to any one of the preceding two aspects, wherein the bisector (B) divides the delivery chamber into a high-pressure region and a low-pressure region. Attached Figure Description

[0108] The invention is further explained below with reference to embodiments. The features disclosed in the embodiments advantageously constitute the subject matter of the claims and the above-described design.

[0109] In the attached image:

[0110] Figure 1 A cross-section of a rotary pump with adjustable delivery capacity according to a first embodiment is shown;

[0111] Figure 2 A cross-section of a rotary pump with adjustable delivery capacity according to a second embodiment is shown;

[0112] Figure 3 A schematic diagram of the rotary pump according to the second embodiment is shown;

[0113] Figure 4 A schematic diagram of the rotary pump according to the first embodiment is shown;

[0114] Figure 5 A schematic diagram of a rotary pump according to a third embodiment is shown;

[0115] Figure 6 A schematic diagram of a rotary pump according to a fourth embodiment is shown;

[0116] Figure 7 A schematic diagram of a rotary pump according to a fifth embodiment is shown.

[0117] List of reference numerals

[0118] 1. Pump casing

[0119] 2. Conveying chamber entrance

[0120] 3. Conveying chamber outlet

[0121] 10 Adjustment Structure

[0122] 11 Returning Spring

[0123] 12 Additional Springs

[0124] 20 Resilience

[0125] 21. Protrusion

[0126] 30 Fluid Control Chamber

[0127] 31 Stop component

[0128] A Internal width

[0129] B Bisector

[0130] D Spring force distance

[0131] d Lever arm distance

[0132] d A Lever arm distance

[0133] d R distance

[0134] F A Combined external forces

[0135] F D Regulation force

[0136] F R resilience

[0137] F Z Additional force

[0138] I Internal contour

[0139] R Rotation axis Detailed Implementation

[0140] Figure 1 and Figure 4 A rotary pump with adjustable delivery capacity according to a first embodiment is shown. The rotary pump includes a pump housing 1 having a delivery chamber having a delivery chamber inlet 2 for the fluid to be delivered in a low-pressure region and a delivery chamber outlet 3 for the fluid in a high-pressure region. A delivery member rotatable about a rotation axis R is arranged in the delivery chamber for delivering the fluid. The delivery member is formed by a delivery rotor and a plurality of blades slidably supported in the delivery rotor.

[0141] To adjust the delivery rate of the rotary pump, the pump housing 1 includes an adjustment structure 10 that can translate back and forth relative to the delivery member along and against the adjustment direction. This adjustment structure has an internal profile I that defines the delivery chamber radially outward. The adjustment structure 10 is constructed in the form of an adjustment ring that surrounds the delivery chamber radially outward, and its internal profile I is designed to be circular. The adjustment structure 10 does not define the delivery chamber in the axial direction.

[0142] Adjustment devices 30 and 31 are constructed in the pump housing 1, which are used to generate an adjustment force F acting on the adjustment structure 10 along the adjustment direction. D The regulating devices 30 and 31 are formed by a fluid regulating chamber 31 and a stop member 31. The fluid regulating chamber is preferably permanently or selectively connected to the high-pressure area of ​​the delivery chamber, so that fluid can act on the regulating surface of the regulating structure 10. Fluid can be diverted from the delivery chamber outlet 3 of the delivery chamber and delivered directly or, for example, via a control valve to the fluid regulating chamber 30.

[0143] Adjustment force F D The force F acts on the regulating structure 10 along the regulating direction. Movement of the regulating structure 10 along the regulating direction causes adjustment of the pump, i.e., a decrease in the delivery rate. Correspondingly, movement of the regulating structure 10 against the regulating direction causes an increase in the delivery rate. D This is generated by the fluid located in the fluid regulating chamber 30 acting on the regulating structure, and the regulating force is... Figure 1 The resultant force is shown in the middle.

[0144] from Figure 1 It can be seen that the resulting regulating force F D The rotating axis R of the pump is crossed at a certain distance. This generates a torque acting in the direction of rotation, which acts on the adjusting structure 10. As the conveying component rotates, in addition to the adjusting force F... D The resulting torque, the frictional torque, also acts on the adjusting structure 10, corresponding to the torque acting along the rotational direction of the conveying member. Alternatively, the resulting adjusting force F D It can act radially relative to the inner contour I onto the adjustment structure 10, such as Figure 4 The diagram is shown in the image. In this case, the resulting adjusting force F D No torque was generated that acted on the regulating structure.

[0145] The rotary pump also includes a restoring force F for applying a force against the adjustment direction to the adjustment structure 10. R The restoring spring 11 and the additional force F applied to the adjusting structure 10 in the same opposite direction of adjustment. ZAdditional spring 12. The restoring spring 11 and the additional spring 12 act on the regulating structure 10 on the side of the regulating structure 10 that is radially opposite to the fluid regulating chamber 30 in the regulating direction.

[0146] The restoring spring 11 is disposed in the restoring space 20. According to... Figure 1 In the embodiment, the recovery space is formed radially opposite to the fluid regulating chamber 30 along the regulating direction. The fluid regulating chamber 30 and the recovery space 20 are fluidly separated from each other, meaning that fluid from the fluid regulating chamber 30 cannot flow into the recovery space 20, and vice versa. The recovery space 20 is preferably pressureless. The recovery space 20 is preferably connected to the low-pressure region of the rotary pump. In addition to the recovery spring 11, an additional spring 12 is also arranged in the recovery space 20.

[0147] The restoring spring 11 and the auxiliary spring 12 are each formed of a helical compression spring. According to this embodiment, the restoring spring 11 and the auxiliary spring 12 are cylindrical compression helical springs. Those skilled in the art will understand that this is merely an exemplary embodiment, and the restoring spring 11 and the auxiliary spring 12 can also be made of other types of springs, such as disc springs, hollow rubber springs, and the like.

[0148] The restoring spring 11 has a first spring constant, and the auxiliary spring 12 has a second spring constant. Preferably, the first spring constant of the restoring spring 11 and the second spring constant of the auxiliary spring 12 are different values. In this embodiment, the second spring constant of the auxiliary spring 12 is preferably smaller than the first spring constant of the restoring spring 11. It is self-evident to those skilled in the art that the first spring constant and / or the second spring constant should be adapted accordingly.

[0149] The restoring spring 11 will exert a restoring force F in the opposite direction of adjustment. R The restoring force F is applied to the regulating structure 10. R According to the first embodiment, the restoring force F acts radially relative to the inner contour I of the adjusting structure 10, i.e., the restoring force F R The axis of rotation intersects at a distance R, where the distance is zero.

[0150] The additional spring 12 will exert an additional force F in the opposite direction of adjustment. Z Apply to the adjustment structure 10. According to Figure 1 and Figure 4 In the first embodiment, the additional force F Z The axis of rotation intersects at a distance d from the lever arm, R, especially the additional force F. Z The action of the intersecting adjustment structure 10. Additional force F Z This applies to the high-pressure area surrounding the delivery chamber of the regulating structure 10.

[0151] Especially in Figure 4 As can be seen, the internal contour I of the adjusting structure 10 has an internal width A, which is divided into two equal-length segments by the bisecting line B transversely to the adjusting direction. Additional force F Z The lever arm distance d is from the bisector B. According to the first embodiment, the line of action of the restoring spring 11 overlaps with the bisector B.

[0152] Additional force F Z A torque, acting in the opposite direction to the rotation of the conveying component, is generated by the lever arm distance d and applied to the adjusting structure 10. This torque is achieved through an additional force F. Z The generated torque is preferably compensated by the adjusting force F D And the torque generated by friction torque, which acts on the regulating structure at least in part along the direction of rotation.

[0153] Restoration F R and additional force F Z The springs are guided to each other into the adjustment structure 10 by a distance D perpendicular to the adjustment direction. According to... Figure 1 or Figure 4 In the embodiment described, the spring force distance D is the same as the lever arm distance d, wherein the additional force F Z Crossing axis of rotation R. Additional force F Z It acts on the high-pressure area surrounding the delivery chamber of the regulating structure 10.

[0154] Here the restoring force F R and / or additional force F Z The restoring force F acts only parallel to the adjustment direction on the adjustment structure 10. In other words, the restoring force F R Corresponding to the net spring force and / or additional force F applied by the restoring spring 11 Z This corresponds to the net spring force applied by the restoring spring 12.

[0155] The restoring forces together generate a net external force F A The resultant external force is at the distance d of the lever arm. A The axis of rotation intersects at point R. The resultant external force F A The distance d of the lever arm A The internal width A, measured radially to the axis of rotation R, is at most 30%, preferably at most 20%, of the internal contour I. The resultant external force F A The force acts on the high-pressure section surrounding the conveying chamber of the regulating structure 10. Therefore, the net external force F A During normal pump operation, a torque is generated that acts on the regulating structure 10 in the opposite direction to the rotation of the rotary pump.

[0156] In the region of the fluid regulating chamber 30, the regulating structure 10 has a stop 31 that contacts one surface of the pump housing 1 when the rotary pump's delivery rate is at its maximum. The stop 31 thus restricts the translational movement of the regulating structure 10 against the regulating direction.

[0157] Resultant external force F A The line of action passes through the stop 31 of the adjusting structure 10, especially the resultant external force F. A The line of action passes centrally through the stop 31 of the adjusting structure 10. Furthermore, the stop 31 is constructed to withstand the restoring force F. R Line of action and additional force F Z Between the lines of action. Adjusting force F D Preferably, the force does not act on the stop 31. That is, the adjusting force F D The line of action does not pass through stop 31.

[0158] In addition to the stop 31, the adjusting structure 10 has a protrusion 21 formed on the side of the adjusting structure 10 opposite to the axial direction of the stop 31. The protrusion 21 is opposite to the stop 31 in the adjusting direction, preferably exactly opposite to the stop 31. The protrusion 21 is centrally formed between the restoring spring 11 and the additional spring 12. That is, the protrusion 21 is centrally configured at the restoring force F R Line of action and additional force F Z Between the lines of action. Furthermore, the net external force F A The line of action passes through protrusion 21.

[0159] The protrusion 21 supports the return spring 11 and the additional spring 12, thereby restricting the spring ends of the return spring 11 and / or the additional spring 12 that abut against the adjustment structure 10 during their movement transversely to the adjustment direction. Furthermore, the protrusion 21 separates the two spring ends transversely to the adjustment direction.

[0160] Figure 2 A cross-section of a rotary pump with adjustable delivery capacity according to a second embodiment is shown. Figure 3 A schematic diagram of a rotary pump according to a second embodiment is shown. The rotary pump according to the second embodiment is similar to that according to... Figure 1 The embodiments differ only slightly. Therefore, in the following, only the differences between the first and second embodiments will be discussed. The description of the first embodiment also applies to the embodiments according to... Figure 2 The embodiments are as long as they do not contradict the second embodiment.

[0161] according to Figure 2 Rotary pump and Figure 1 The difference in the embodiments is particularly that the rotary pump only includes a restoring force F for applying a force against the adjustment direction to the adjustment structure 10. RThe return spring 11. That is, unlike the rotary pump of the first embodiment, according to Figure 2 The rotary pump does not have an additional spring 12.

[0162] The restoring spring 11 generates a restoring force F R The restoring force is at a distance d R The axis of rotation intersects at point R. Restoring force F. R Here, the intersecting internal contour I acts on the adjusting structure 10. That is, the restoring force F R The line of action is a secant line about the internal contour I of the adjustment structure 10. That is, unlike the first embodiment, the restoring force F... R The inner contour I of the adjustment structure 10 does not act radially on the adjustment structure 10.

[0163] Distance d R The internal width A, measured radially to the axis of rotation R, is at most 30%, preferably 20%, of the internal contour I. The internal width A is measured perpendicular to the adjustment direction. The restoring spring 11 according to the second embodiment therefore assumes the function of the additional spring 12 and simultaneously assumes the function of the restoring spring 11 of the first embodiment. In other words, the additional force F... Z The resultant external force F corresponding to the first embodiment A In other words, regarding the net external force F A The description also applies to the restoring force F of the second embodiment. R .

[0164] Restoration F R The force is preferably applied to the high-pressure region surrounding the delivery chamber of the regulating structure 10. Therefore, the restoring force F... R During normal pump operation, a torque is generated that acts on the regulating structure 10 in the opposite direction to the rotation of the rotary pump.

[0165] The rotary pump according to the second embodiment also has a stop 31, which contacts one surface of the pump housing 1 when the pump's delivery volume is at its maximum. The stop 31 thus restricts the translational movement of the adjustment structure 10 against the adjustment direction.

[0166] However, compared with the resultant external force F according to the first embodiment A Different lines of action, restoring force F R The line of action does not pass through the stop 31 of the adjusting structure 10. According to Figure 2 The regulating force F D Similarly, the adjusting force F acts radially relative to the inner contour I of the adjusting structure 10. That is, the adjusting force F... D The axis of rotation is crossed at a distance equal to zero from the lever arm.

[0167] In other respects, Figure 2 The embodiments in the example correspond to Figure 1 Examples are shown in the text.

[0168] A schematic diagram of the rotary pump in the third embodiment is shown below. Figure 5 As shown. Since the differences between the third embodiment and the first embodiment are only minor, only the essential differences should be discussed. The description of the first embodiment also applies to the third embodiment, provided that it does not contradict the third embodiment.

[0169] The rotary pump according to the third embodiment is substantially corresponding to the first embodiment. That is, according to the third embodiment, the rotary pump has a restoring spring 11 and an additional spring 12, wherein the restoring spring 11 generates a restoring force F. R It acts on the adjusting structure 10 in the opposite direction to the adjusting direction, while the additional spring 12 generates an additional force F. Z Its relationship with restoring force F R It acts on the adjustment structure 10 in the opposite direction of adjustment.

[0170] according to Figure 5 Implementation examples and according to Figure 1 and Figure 4 The difference in the embodiment is that the restoring force F R The restoring force F acts non-radially relative to the inner contour I on the adjusting structure 10. Compared to the first embodiment, the restoring force F R Its function is as a secant. Restoring force F R At a distance d R The axis of rotation intersects at point R.

[0171] Distance d R The restoring force F is less than the lever arm distance d. R At this distance, the axis of rotation intersects R, and the attached force F... Z The axis of rotation crosses at the distance of this lever arm. Restoring force F. R and additional force F Z A spring force distance D is introduced into the adjusting structure 10, where the spring force distance D is the lever arm distance d and the distance d. R The sum of all forces. Restorative force F R and additional force F Z The adjustment is perpendicular to the direction of adjustment and acts on the adjustment structure 10 on different sides of the bisector B.

[0172] Restoration F R according to Figure 5 The embodiment in the text preferably acts on the low-pressure region surrounding the conveying chamber of the regulating structure 10. That is, the restoring force F R A torque is generated that acts on the adjusting structure 10 in the direction of rotation of the conveying component. The additional force F in the third embodiment... ZAs in the first embodiment, the additional force F Z This generates a torque that acts on the adjusting structure 10 in the opposite direction to the rotation. This additional force F Z The generated torque is greater than the restoring force F R The generated torque causes the restoring force F to... R and additional force F Z This generates a resultant torque, which acts on the adjusting structure 10 in the opposite direction to the rotation of the conveying component.

[0173] In other words, the restoring force F R and additional force F Z Generates a net external force F A Its cleaving action is applied to the adjusting structure 10. The lever arm distance d, the additional force F Z The axis of rotation intersects at the distance of the lever arm, R, and the distance d. R Restoration force F R At this distance, the axis of rotation intersects R, and an additional force F is applied. Z and recovery force F R The net external force F is measured in this way. A The force is preferably applied to the high-pressure region surrounding the conveying chamber of the regulating structure 10. That is, the net external force F... A A torque is generated that acts on the regulating structure 10 in the opposite direction to the rotation of the conveying component.

[0174] Figure 6 A schematic diagram of the fourth embodiment is shown. Since the differences between the fourth embodiment and the first and third embodiments are only minor, only essential differences should be discussed. The descriptions of the first and third embodiments also apply to the fourth embodiment, provided they do not contradict each other.

[0175] According to the fourth embodiment, the restoring force F R Similarly at a distance d R The axis of rotation intersects at R, but the restoring force F R With additional force F Z The preferred action is on the high-pressure area surrounding the delivery chamber of the regulating structure 10. Restoring force F R and additional force F Z The force acts on the adjustment structure 10 on the same side of the bisector B, perpendicular to the adjustment direction.

[0176] Distance d R Restoration force F R At this distance, the axis of rotation intersects R, and the spring force distance D is added to obtain the lever arm distance d, and the restoring force F. R The axis of rotation crosses at the distance of the lever arm.

[0177] Figure 7A schematic diagram of the fifth embodiment is shown. Since the fifth embodiment only involves the additional spring 12 and the additional force F... Z The aspects differ from the first embodiment, therefore only the essential differences should be discussed. The description of the first embodiment also applies to the fifth embodiment, provided they are not contradictory.

[0178] According to Figure 1 In contrast to the embodiment, the additional spring 12 is disposed on the side of the adjusting structure 10 that is radially opposite to the restoring spring 11. The additional spring 12 generates an additional force F. Z It acts on the adjusting structure 10 along the adjusting direction. That is, unlike other embodiments, the additional force acts along the direction of the adjusting force F. D Acting in the same direction.

[0179] The entire regulating force can be said to consist of several component forces, one of which is the regulating force F. D The second component force is formed by the additional force F. Z Formation. Two of the component forces act permanently on the regulating structure 10.

[0180] Additional force F Z The axis of rotation crosses at a distance d from the lever arm. An additional force F is applied. Z Preferably, the force F acts on the low-pressure section surrounding the conveying chamber of the regulating structure 10. In this way, the additional force F... Z The torque generated acts on the regulating structure, and its direction is opposite to the torque generated by the friction of the conveying component and is against the direction of rotation.

[0181] Adjustment force F of restoration devices 30 and 31 D The additional force F of the additional spring 12 D Preferably, the force is applied to the adjustment structure 10 at an acute angle of less than 10° to the adjustment direction.

Claims

1. A rotary pump with adjustable delivery capacity, comprising: 1.1 Pump housing (1), the pump housing having a delivery chamber having a delivery chamber inlet (2) for the fluid to be delivered in a low-pressure region and a delivery chamber outlet (3) for the fluid in a high-pressure region. 1.2 A conveying member for conveying the fluid, the conveying member being rotatable about a rotation axis (R) within the conveying chamber. 1.3 Adjustment structure (10), which is capable of translating back and forth in the pump housing (1) relative to the conveying member in the adjustment direction and in the opposite direction for adjusting the delivery volume of the rotary pump, the adjustment structure having an internal contour (I) that defines the conveying chamber in the radial exterior. 1.4 A regulating force (F) is used to generate a regulating force (F) acting on the regulating structure (10) along the regulating direction. D Adjustment devices (30, 31) of ) 1.5 A restoring force (F) is applied to the adjusting structure (10) in the opposite direction of the adjustment. R The recovery spring (11) of the ) 1.6 An additional force (F) is applied to the adjusting structure (10) in the opposite direction of the adjustment. Z Additional spring (12) of ) 1.7 Wherein, the additional force (F) Z The axis of rotation (R) intersects at the distance (d) of the additional force lever arm. 1.8 of which, The restoring force (F) R ) and the additional force (F) Z The resultant external force (F) is generated. A The resultant external force (F) A ) at the distance of the lever arm of the net external force (d) A The axis of rotation (R) intersects at point ).

2. The rotary pump according to claim 1, wherein, The additional force (F) Z ) and / or the restoring force (F) R The internal contour (I) is intersected by the adjustment structure (10).

3. The rotary pump according to claim 1, wherein, The distance between the lever arms of the resultant external force (d) A The inner width (A) is at most 30% of the inner contour (I) measured radially to the axis of rotation (R), wherein the inner width (A) is oriented perpendicular to the adjustment direction.

4. The rotary pump according to claim 1, wherein, The additional force (F) Z The additional force (F) acts against the direction of adjustment on a section of the adjustment structure (10) surrounding the high-pressure area of ​​the delivery chamber, or wherein the additional force (F) acts against the direction of adjustment. Z The adjustment is applied along the adjustment direction to the section of the adjustment structure (10) surrounding the low-pressure area of ​​the delivery chamber.

5. The rotary pump according to claim 1, wherein, The additional force (F) Z This generates a torque that acts on the adjustment structure (10) and points in the opposite direction to the rotation of the conveying member.

6. The rotary pump according to claim 1, wherein, The resultant external force (F) A This generates a torque that acts on the adjustment structure (10) and points in the opposite direction to the rotation of the conveying member.

7. The rotary pump according to claim 1, wherein, The restoring force (F) exerted by the restoring spring (11) on the adjusting structure (10) R The additional force (F) exerted on the adjusting structure (10) by the additional spring (12) and / or the additional force (F) of the additional spring (12) Z It acts only parallel to the adjustment direction or at an acute angle of less than 10° to the adjustment direction.

8. The rotary pump according to claim 1, wherein, The restoring force (F) R ) and the additional force (F) Z The spring forces act on the adjustment structure (10) at a distance (D) perpendicular to the adjustment direction.

9. The rotary pump according to claim 8, wherein, The spring force distance (D) is equal to or greater than the additional force lever arm distance (d).

10. The rotary pump according to claim 1, wherein, The restoring force (F) R The additional force (F) acts radially on the adjustment structure (10) along the axis of rotation (R) or crosses the axis of rotation (R) at a distance less than the distance (d) of the additional force lever arm, wherein the additional force (F) Z ) intersects the axis of rotation (R).

11. The rotary pump according to claim 1, wherein, The restoring force (F) R ) greater than the additional force (F) Z ).

12. The rotary pump according to claim 1, wherein, The restoring force (F) R ) and the additional force (F) Z The adjustment structure (10) occupies one or more different positions of the adjustment structure (10) within the range of its movement along and against the adjustment direction, and has a different size at each position.

13. The rotary pump according to claim 1, wherein, The resultant external force (F) A It acts on the adjustment structure (10) in the opposite direction to the adjustment.

14. The rotary pump according to claim 13, wherein, The adjusting device includes a stop (31) that contacts one surface of the pump housing (1) when the rotary pump's delivery volume is at its maximum, and wherein the resultant external force (F) A The line of action of the stop (31) passes through the stop.

15. The rotary pump according to claim 13, wherein, The resultant external force (F) A The rotation axis (R) intersects at a distance, and the resultant external force (F) A It acts against the adjustment direction on the section of the adjustment structure (10) surrounding the high-pressure area of ​​the delivery chamber.

16. The rotary pump according to claim 13, wherein, The resultant external force (F) A The resultant external force (F) acts secantly to the adjusting structure (10) and the inner contour (I), and the resultant external force (F) A This generates a torque that acts on the regulating structure (10) and points in the opposite direction to the rotation of the conveying component during normal pump operation.

17. The rotary pump according to any one of the preceding claims, wherein, The adjusting device includes a stop (31) that contacts one surface of the pump housing (1) when the rotary pump's delivery is at its maximum, and wherein the stop (31) is formed in the restoring force (F) R The line of action of ) and the additional force (F) Z Between the lines of action of ).

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