EP3118411B1 - Vane for a vane pump and vane pump - Google Patents

Description

The invention relates to a vane for a vane pump, in particular for a vacuum pump, and a vane pump, in particular a vacuum pump.

A vane pump with generic blades is for example from the WO 02/25113 A1 previously known. The wings shown there have an upper side and a lower side for contact with the floor and the ceiling of a pump room, the wing also providing a front side and a rear side opposite the front side to limit pressure chambers formed in the pump room. The wing provides two end faces for sliding contact with a shell-side inner wall of the pump chamber, the wing comprising a base body made of a first plastic material and a wing end formed on the base body, forming the end face of the wing and made of a second plastic material. The base body is preferably made of a thermoset, which is comparatively inexpensive, the wing tip preferably being made of a thermoplastic that has properties that are favorable to wear and friction. The base body has a fastening section which is shaped by the wing end and has grooves running parallel to the end face of the wing. These grooves are filled with the material of the second plastic, in particular when the wing tip is shaped.

Further vane pumps with features from the preamble of claim 1 are from the DE 10 2010 026034 A1 , of the DE 10 2000 4034921 B3 and the DE 100 307 040 A1 known.

Starting from a wing like the one from the WO 02/25113 A1 As is previously known, the present object of the invention is to create a vane and an associated vane pump which, in particular, also works reliably at higher temperatures and with which, preferably, higher pumping capacities can also be provided.

This object is achieved by a wing with the features of claim 1. In particular, such a wing provides that the fastening section has at least one recess which runs in the transverse direction running transversely to the front and / or rear. Providing such a recess in the fastening section has the advantage that the end face can be securely molded onto the base body, so that the pump can also be operated safely at higher temperatures and / or with larger-sized pumps, and in particular with taller blades. With the known wings it has been found that at higher operating temperatures, due to the different expansion coefficients of the different plastics, the wing tips are no longer securely anchored to the base body, but rather shift relative to the base body to a limited extent, in particular in a direction perpendicular to the top or bottom. By providing at least one recess, and preferably several recesses, which are provided in the transverse direction on the fastening section and into which the second plastic material of the wing end engages when the wing end is formed, an improved arrangement of the wing ends on the fastening section is achieved. One equipped with such a wing Vane pump can be used at higher operating temperatures. In addition, the wing can also be built higher in the direction perpendicular to the top or bottom without jeopardizing the secure connection of the wing ends to the base body. Overall, an increase in the output of the vane pump can thereby be provided.

The at least one recess is provided in the vertical direction in the central region of the fastening section. This results in a uniform anchoring of the wing end on the base body.

Furthermore, the at least one recess has undercuts in the longitudinal direction, that is to say in the direction perpendicular to the end face of the wing. Such undercuts prevent the respective wing end from being able to lift off the base body in the longitudinal direction during operation of the wing. Overall, an additional, better anchoring of the wing end on the base body is provided.

The at least one recess preferably has holding surfaces that run parallel to the top and / or bottom. In particular, forces acting on the wing tip perpendicular to the upper and / or lower side can be diverted into the base body in these holding surfaces. Moving or releasing the wing end in the direction perpendicular to the top and / or bottom of the wing is thus avoided.

The wing can preferably provide wing ends made of a second plastic material on both end faces; Such a wing is then used in a single-wing vane pump.

The sliding contact of the end faces on the shell-side inner wall of the pump chamber can be direct or it can be a sliding medium, such as for example an oil film, can be provided between the end faces and the inner wall.

Advantageously, the contour of one wing end is axially symmetrical to the contour of the other wing end in plan view of the top or bottom of the one end face, the axis of symmetry then being in particular the axis of rotation or the central vertical axis of the wing.

Alternatively or additionally, at least one cutout is advantageously provided in the area of the top and / or the bottom of the fastening section. Such a recess also contributes to a firm anchoring of the wing end on the base body.

The one or more recesses can be designed such that they extend completely through the fastening section in the transverse direction. However, it is also conceivable for the cutout to be designed as a “sack” cutout and, viewed in the transverse direction, to provide a base which is formed in particular by the fastening section.

It is advantageous if the at least one recess, viewed in the transverse direction, is T-shaped, and in particular if the T-bar forms the undercuts. Such recesses can be realized in a simple manner and still lead to a secure anchoring of the wing tips.

In particular, it is conceivable that several and / or differently designed recesses are provided on the fastening section, which are adapted to the respective requirements of the wing end or the wing.

It is also advantageous if the fastening section, viewed in the transverse direction, is on the front side and the rear side of the fastening section each has a groove, the two grooves being provided laterally offset from one another. In contrast, from the prior art according to FIG WO 02/25113 A1 two longitudinal grooves are provided which lie in the same transverse plane of the wing. Due to the offset arrangement of the grooves, better anchoring of the wing end on the base body can be achieved.

It is conceivable that the groove webs that delimit the two grooves and face away from the base body are connected by a wall section running obliquely to the front and / or rear as viewed from above on the top and / or bottom. By providing such an inclined wall section, a better introduction of the forces acting on the wing tips into the base body can be provided. In addition, the wing tips are better anchored to the base body.

The wing tips as such can preferably be designed to run asymmetrically to the central longitudinal plane of the wing when viewed from above. This results in a more optimal adaptation of the wing end to the jacket-shaped inner wall of the pump chamber and a favorable force distribution acting on the wing ends.

The wing tip can have a first bulbous section and a flat second section running obliquely to the front and / or back of the wing, the second section preferably facing the low-pressure chamber when the vane pump is in operation. It has been shown that precisely such a contour of the wing contributes to good pumping properties.

It is also advantageous if the second section is followed by at least one further flat third section, which also runs obliquely to the front and / or rear, the third section with the front and / or the Rear side encloses a smaller angle than the second section or which runs parallel to the second section. It has been shown that such a contour leads to further positive properties of the pump.

The object on which the invention is based is also achieved by a vane pump, in particular a vacuum pump, which provides a pump chamber, a rotor rotatably mounted in the pump chamber, and a vane according to the invention that can be guided in the radial direction in the rotor.

Further advantages and individual embodiments of the invention can be found in the following description, on the basis of which an exemplary embodiment of the invention is described and explained in more detail.

Figur 1

eine perspektivische Ansicht eines erfindungsgemäßen Flügels;

Figur 2

die Draufsicht auf den Flügel gemäß Figur 1;

Figur 3

die Ansicht des Flügels gemäß Figur 1 mit separat dargestelltem Flügelende;

Figur 4

den Grundkörper des Flügels gemäß Figur 1 in Vorderansicht;

Figur 5

den Grundkörper gemäß Figur 4 in Seitenansicht;

Figur 6

den Grundkörper gemäß Figur 4 in Draufsicht;

Figur 7

den Grundkörper gemäß Figur 4 in perspektivischer Ansicht von schräg oben;

Figur 8

eine vergrößerte Ansicht des Flügelendes aus Figur 3; und

Figur 9

eine erfindungsgemäße Flügelzellenpumpe mit einem Flügel gemäß Figur 1.

Show it:

Figure 1

a perspective view of a wing according to the invention;

Figure 2

the top view of the wing according to Figure 1 ;

Figure 3

the view of the wing according to Figure 1 with separately shown wing tip;

Figure 4

the main body of the wing according to Figure 1 in front view;

Figure 5

the body according to Figure 4 in side view;

Figure 6

the body according to Figure 4 in plan view;

Figure 7

the body according to Figure 4 in a perspective view obliquely from above;

Figure 8

an enlarged view of the wing tip Figure 3 ; and

Figure 9

a vane pump according to the invention with a wing according to Figure 1 .

In the Figures 1 to 3 is an inventive vane 10 for a vane pump, as for example in Figure 9 is shown. The wing 10 has a top 12 and a bottom 14. Furthermore, it has a front side 16 and a rear side 18 running perpendicular thereto. The wing 10 provides two end faces 20 at its free ends 24. The wing 10 comprises a base body 22 which is made from a first plastic material that is comparatively cheap, break-proof and dimensionally stable, such as PPS with glass fibers. Wing ends 24, which form the end faces 20 and are made of a wear-resistant material, such as PEK or irradiated PA66, are provided on the base body 22. The wing tips 24 are attached to the fastening portion 26, which is particularly in the Figures 4 to 7 are easy to see.

The base body 22 has, as from the Figures 1 , 2 and 3 It becomes clear, in each case a closed front side 16 and a closed rear side 18, the base body overall being designed like a framework with webs 28 running obliquely to the front side 16 and rear side 18.

The wing tips 24 are preferably molded onto the base body 22 in a two-component injection molding process.

As from the Figures 4 to 7 As becomes clear, which only show the base body 22 without wing ends 24, the fastening sections 26 each provide a groove 30, 32 running parallel to the end face 20 in the region of their front and rear. The grooves are not in a common plane running perpendicular to the front or rear side 16, 18, but are arranged laterally offset from one another.

As shown in particular from the top view Figure 6 As is clear, two groove webs 33, which delimit the two grooves 30, 32, are connected to one another by a wall section 34 which, in plan view, runs obliquely to the front 16 and rear 18.

As also from the Figures 4 to 7 As is clear, the two fastening sections 26 each have four recesses 36, 38, 40, 42, which extend in a direction running transversely to the front side 16 and rear side 18.

The recesses 36 and 38 are each provided in the central area of the fastening sections 26 and each have two holding surfaces 43 running parallel to the top and / or bottom 12, 14 and a base 45. The recess 38 is introduced from the front side 16 of the base body 22; the recess 40 from the rear side 18 of the base body 22.

Between the recesses 36 and 28, as in FIG Figure 5 it can be clearly seen that a web 44 is present; the recesses 36 and 38 consequently do not extend completely in the transverse direction through the fastening section 26. It would also be conceivable that recesses are also provided which extend completely in the transverse direction through the fastening section.

Like from for example Figure 2 or 4th As is clear, the recesses 38 have undercuts 46 in the longitudinal direction of the wing 10, that is to say viewed perpendicular to the end face 20. The recesses 38 are T-shaped, the undercuts 46 being formed by the free ends of the T-bar. When spraying the wing tips 24 These undercuts 46 are filled with the material of the wing tips 24. As a result, a secure anchoring of the wing tips 24 on the base body 22 is achieved. In particular at higher temperatures, forces acting perpendicular to the top and / or bottom can be diverted into the holding surfaces 43 and into the undercuts 46. A movement or detachment of the wing tip 24 in the direction perpendicular to the upper and / or lower side of the wing tips 24 from the base body 22 can therefore not take place.

In the case of taller wings 10, that is to say in the case of wings in which the upper side 12 is further spaced from the lower side 14, it is conceivable to provide further cutouts corresponding to the cutouts 38 and 40 on the fastening section 26.

As shown in particular from the top view Figure 3 It becomes clear that the wing ends 24 are designed asymmetrically, being axially symmetrical to the central vertical axis 48. In the in Figure 8 enlarged section of the Figure 3 , which shows a wing tip 24, it can be clearly seen that the wing tips 24 have a bulged section 50, which is provided for sliding contact with the inner wall 68 of the pump chamber 64 when the pump 60 is in operation. A flat second section 52, which runs obliquely to the front 16 and rear 18, adjoins the bulbous section 50. The section 52 forms an angle α in the range of 30 to 60 and in particular in the range of 55 ° with the rear side 18 of the wing 10. In operation, section 52 faces the low pressure chamber.

This second section 52 is adjoined by a set-back third section 54 which runs parallel to the second section 52 and is connected to the section 52 via an intermediate section 56. It is also conceivable that the third section 54 runs parallel to the second section 52, and in particular is set back from this.

Forming points 58 can be seen on the top and bottom of the end sections.

Figure 9 shows a vacuum pump 60 without a cover, which has a housing 62 which surrounds a pump chamber 64. In the housing 62, a rotor 66 is rotatably mounted, in which the in the Figures 1 to 7 The wing 10 shown is mounted displaceably in a wing slot in the longitudinal direction of the wing 10. When the pump is in operation, the wing ends 24 rest against a jacket-side inner wall 66 of the pump chamber 64 in a slidable manner. As a result, the wing 10 divides the pump chamber 64 into different pressure chambers. In operation, the rotor 66 rotates about its axis of rotation along the arrow 68, whereby air or another fluid such as oil is sucked in through an inlet opening 70 provided in the housing 62 and air or another fluid is conveyed through a further outlet opening 72 becomes.

The ones in the Figure 9 Vane pump shown with a wing 10, as it is in the Figures 1 to 8 shown has the advantage that the wing tips 24 are securely anchored to the base body 22 at higher temperatures. Due to the different temperature coefficients of the material of the base body and the material of the wing tips 24, it is still possible to prevent the wing tips 24 from becoming detached or slipping on the base body 22 at high temperatures or when the wings are tall in the vertical direction.

Claims (11)

1. Wing (10) for a rotary vane pump (60), in particular for a vacuum pump, whereby the wing (10) can be guided by a rotor (66) in a pump space (64) around a rotating axis and in a lengthwise direction in the rotor (66) perpendicular to the rotating axis,
   with a top side (12) and bottom side (14) for attaching to the base and roof of the pump space (64), with a front side (16) as well as a back side (18) opposite the front side (16) for demarcating pressure chambers,
   with at least one face side (20) for the gliding attachment on a cover-side inner wall (68) of the pump space (64),
   whereby the wing (10) has a base body (22) with two fastening sections (26) consisting of an initial plastic material and a form-locking wing end (24) on each fastening section (26) that forms the respective face side (20) made from a second plastic material, such that the respective fastening section (26) is covered by the respective wing end (24),
   distinguished by the fact that the respective fastening section (26) has at least one recess (36, 38, 40, 42) that runs perpendicular in a cross-wise fashion to the front and back side (16, 18), whereby the recesses (38), viewed lengthwise, have indentations (46), and whereby the recesses (36, 38) are situated in the middle segment of the respective fastening section (26).
2. Wing (10) as per claim 1, distinguished by the fact that at least one recess (40, 42) is situated in the area of the top side (12) and/or bottom side (14) of the respective fastening section (26).
3. Wing (10) as per claim 1 or 2, distinguished by the fact that the recess(es) extends cross-wise completely through the fastening section (60).
4. Wing (10) as per claim 1, distinguished by the fact that the recess(es) (38), viewed cross-wise, is T-shaped and that the T-bar forms the indentations (46).
5. Wing (10) as per one of the preceding claims, distinguished by the fact that there are multiple and/or differently designed recesses (36, 38, 40, 42) on the respective fastening section (26).
6. Wing (10) as per one of the preceding claims, distinguished by the fact that the respective fastening section (26), viewed cross-wise, has two adjacent grooves (30, 32) running parallel to the face sides (20).
7. Wing (10) as per claim 6, distinguished by the fact that the groove supports (33) adjoining the two grooves (30, 32) and facing away from the base body (22) are, viewing the top side (12) and/or bottom side (14) from above, are connected at a slant to the wall section (34) running along the front side and/or back side (16, 18).
8. Wing (10) as per one of the preceding claims, distinguished by the fact that the respective wing end (24), viewing the top side from above, is asymmetrically designed.
9. Wing (10) as per claim 8, distinguished by the fact that the wing end (24), viewing the top side from above, has an initial bulbous section (50) and a flat, second section (52) skewed to the front side and/or back side, that faces the lower pressure chamber during operation.
10. Wing (10) as per claim 9, distinguished by the fact that the second section (52) is connected to at least another flat, third section (54, 56) that likewise has a skewed connection to the front and/or back side, that includes a smaller angle than the second section (52) with the front side (16) and/or back side (18) and/or runs parallel to the second section (52).
11. Rotary vane pump (60), in particular a vacuum pump, including a pump space (64), a rotating rotor (66) in the pump space, and a wing (10) in the rotor (66) that can be guided in a radial direction, as per one of the preceding claims.

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