DE102005039293A1 - delivery unit - Google Patents

Abstract

Known delivery units have a rotor mounted in a pump chamber, which has circumferential guide grooves, in which sealing bodies are provided, which are guided in the radial direction with respect to a rotor axis on a raceway which is surrounded by a ring section of a pump housing. The entire circumferential surface of the race lies against the ring section. When the roll-shaped sealing bodies roll off the structure-borne noise that is generated on the race, it is transmitted over a large area to the rest of the conveyor assembly, so that the perceptible running noises of the conveyor assembly can exceed a predetermined threshold value. DOLLAR A In the conveyor unit according to the invention, the running noises are reduced by providing structure-borne noise damping. DOLLAR A According to the invention, the race (28) is mounted on the ring section (43) by means of bearings (38) which are spaced apart in the circumferential direction, at least one space (49) being formed in the circumferential direction between the bearings (38).

Description

The invention relates to a Förderagregat according to the preamble of the main claim. It is already a Förderagregat from the DE 103 33 190 A1 known, with a rotor mounted in a pump chamber having guide grooves on the circumference, in which sealing bodies are provided, which are guided in the radial direction with respect to a rotor axis on a race which is surrounded by a ring portion of a pump housing. The race is formed from a strip-shaped plastic insert, which is inserted into a ring shaped in the ring section and thereby has a butt joint. The race is located with its entire peripheral surface of the ring section. When unrolling the roller-shaped sealing body on the race resulting structure-borne noise is transmitted over the raceway over a large area to the rest of the delivery unit, so that the perceptible running noise of the delivery unit can exceed a predetermined threshold.

Advantages of invention

The inventive Förderagregat with the characterizing features of the main claim has the Advantage that in a simple way a reduction in the noise of the delivery unit is achieved by the raceway by means of circumferentially to each other spaced bearing is mounted on the ring portion, wherein in Circumferential direction between the bearings in each case at least one space is formed. This bearing according to the invention, the bearing surface of the Running ring on the ring section and thus reduces the structure-borne sound transmission.

By in the subclaims listed activities are advantageous developments and improvements of the main claim specified funding agency possible.

Especially is advantageous if the bearings on the ring section and / or at the raceway are formed. According to an advantageous embodiment are the bearings as a bar-shaped, rib-shaped or humpbacked increases educated.

Advantageous is when provided at the camps means for soundproofing since less structure-borne sound in this way transferred from the race to the delivery unit becomes.

Furthermore is advantageous if the means for sound damping are formed on the race, because the running noise by the example on the race rolling off roller-shaped sealing body in essentially arise on the race, so that the sound attenuation close the noise source he follows.

Advantageous is when the race is made exclusively from a sound-absorbing Material is made, as the race in this way special economical can be produced.

In addition, advantageous is when the raceway on a bearing facing the outside at least in sections, in the area of the bearings a sound-absorbing Having coating, since the race in this way from a Metal is produced and thereby has a higher rigidity than a race of sound-absorbing Material. It is guaranteed in this way that the race is not breaks.

Furthermore is advantageous if the race is covered with a damping layer, because the race is sound-damped in this way also at its end faces, so that the running noise especially are greatly reduced.

Further is advantageous if the race by means of another bearing is mounted against rotation in the ring portion, since the sealing bodies facing Inside the raceway deviates from the circular shape and the raceway therefore for a correct function of the delivery unit requires a predetermined position in the ring portion. The race can finished as a single part and inserted into the ring section become.

Very It is advantageous if the pump chamber at the front between a Suction cap and a pressure cap is formed, wherein the ring section of the valve housing is formed on the pressure lid. That's the way it is Assembly of the race particularly easy.

drawing

embodiments The invention are shown in simplified form in the drawing and explained in more detail in the following description.

Show it 1 in section, a first embodiment of the delivery unit according to the invention, 2 a sectional view through the pump chamber of the delivery unit, 3 a sectional view of the bearing in the ring portion race according to the first embodiment, 4 A second embodiment of the delivery unit according to the invention, 5 a Sectional view of the mounted in the ring portion race according to the second and a third embodiment and 6 the third embodiment of the delivery unit according to the invention.

description the embodiments

1 shows a first embodiment of the delivery unit according to the invention.

The delivery unit has an example cylindrical pump housing 1 with at least one input channel 2 and an output channel 3 , The input channel 2 the delivery unit is for example via a suction line 6 with a storage container 7 connected, in which, for example, fuel is stored. The output channel 3 of the unit is via a pressure line 8th For example, with an internal combustion engine 9 connected.

The delivery unit is a roller-cell pump whose operation, for example, from the DE 103 33 190 A1 is known and the content of which is expressly intended to be part of the disclosure of this application.

The pump housing 1 has a pump part 12 and a drive part 13 , The pump part 12 has a pump chamber 14 in which a rotor 15 is mounted eccentrically and rotatably. The rotor 15 is from one in the drive part 13 provided actuator 18 , For example, an electric motor, via a drive shaft 19 driven in rotation. The pump chamber 14 is bounded by two in the direction of a rotor axis 20 opposite end walls, a first, the input channel 2 facing end wall 21 and a second, the output channel 3 facing end wall 22 , and in the radial direction with respect to the axis 20 from an annular wall 23 , The first end wall 21 is on the the rotor 15 facing inside of a suction cover 26 formed and the second end wall 22 on the rotor 15 facing inside of a pressure lid 27 , The ring wall 23 is for example on the rotor 15 facing inside of a race 28 intended.

The pump housing 1 has a cylinder section 31 on, on the pump part 12 facing end side of the suction cover 26 and on the drive part 13 facing end face a connection cover 32 having. The suction cover 26 and the connection cover 32 close the cylinder section 31 of the housing 1 close to the outside environment. The input channel 2 of the pump housing 1 is for example on the suction cover 26 provided and via a pump chamber input 33 with the pump chamber 14 flow-connected. The output channel 3 of the pump housing 1 is for example on the connection cover 32 educated. The connection cover 32 also has electrical connections 36 for contacting the in the pump housing 1 provided actuator 18 on.

In the pressure lid 27 the delivery unit is for example a pump chamber outlet 34 arranged, which is the pump chamber 14 with a pressure room 35 of the pump housing 1 strömungsverbindet. The pressure room 35 is in the radial direction with respect to the rotor axis 20 through the cylinder section 31 and in the axial direction through the pressure lid 27 and the connection cover 32 limited. The pressure room 35 is at least indirectly via the output channel 3 of the pump housing 1 and the pressure line 8th with the internal combustion engine 9 flow-connected. In the pressure room 35 is the actor, for example 18 arranged, which the drive shaft 19 rotating drives. The pressure lid 27 has a drive channel 37 on which the drive shaft 19 into the pump chamber 14 protrudes to the rotor 15 to drive in rotation. The drive shaft 19 is at the the actor 18 remote end, for example, in a storage 38 of the suction cover 26 stored.

The race 28 is from a ring section 43 of the valve housing 1 surrounded and stored in this non-positively and / or positively and / or cohesively. For example, the race is 43 in the ring section 43 pressed. The ring section 43 is formed for example by the fact that the pressure lid 27 on the rotor 15 facing end a recess 44 with a recess 44 surrounding annular shoulder 45 having. The ring section 43 but can also be part of the cylinder section 31 be, with the race 28 directly on the cylinder section 31 stored and between the suction cover 26 and the pressure lid 27 is arranged.

The race 28 is for example completely made of plastic. Through this choice of materials little structure-borne noise on the raceway 28 on the pump housing 1 transfer. The ring section 43 and the race 28 can be made of different Matreial.

2 shows a simplified sectional view through the pump chamber of the delivery unit.

At the delivery unit after 2 are the opposite to the delivery unit after 1 Constant or equivalent parts by the same reference numerals.

The rotor 15 is formed, for example, as a cylindrical grooved disc, which has a plurality of circumferentially distributed guide grooves 40 having. In the guide grooves 40 are sealing bodies 39 vorgese hen, for example, cylindrical rollers, the rotation of the rotor 15 due to the centrifugal force on the ring wall 23 of the race 28 be pressed and on the ring wall 23 glide or roll along. The ring wall 23 forms a so-called shape career.

3 shows a simplified sectional view of the bearing in the ring portion race according to the first embodiment.

At the bearing in the ring section race after 3 are the opposite to the delivery unit after 1 and 2 Constant or equivalent parts by the same reference numerals.

According to the invention it is provided that the raceway 28 by circumferentially spaced bearings 48 in the ring section 43 is stored, wherein in the circumferential direction between the bearings 48 each at least one space 49 is formed. The race 28 lies on the front side of the lids 26 . 27 and on the perimeter at the camps 48 at. By the inventive storage of the race 28 becomes the bearing surface of the race 28 at the ring section 43 and thus the structure-borne sound transmission from the raceway 28 on the ring section 43 of the pump housing 1 reduced, so that less noise from the delivery unit are acoustically perceptible.

Camps 48 are on the ring section 43 and / or on the race 28 formed and in the axial direction with respect to the rotor axis 20 Seen as web-shaped, rib-shaped, hump-shaped, triangular or similar elevations executed. The raises 48 for example, run from the ring section 43 starting radially inward to an outside 51 of the race 28 ,

Since the on an inside 50 of the race 28 trained forming career deviates from the circular shape and, for example, has elliptical sections, is the race 28 in the ring section 43 arranged non-rotatably by the raceway 28 for example by means of a tab 58 positive fit with another bearing 48.1 interacts. For example, the tab protrudes 58 positively in a depression 59 the further camp 48.1 into it. The tab 58 is for example on the race 28 and the other camp 48.1 at the ring section 43 trained or vice versa.

While the camps 48 the race 28 Support in the radial direction, fixes the other camp 48.1 the race 28 in the circumferential direction, for example exclusively. For example, there are three bearings 48 for radial support and another bearing 48.1 intended to prevent rotation.

The gaps 49 between the camps 48 . 48.1 are each through a gap between the ring section 43 and the race 28 formed by the camps 48 . 48.1 in several spaces 49 is shared.

4 shows simplified a second embodiment of the delivery unit according to the invention.

At the delivery unit after 4 are the opposite to the delivery unit after 1 to 3 Constant or equivalent parts by the same reference numerals.

Since the structure-borne noise due to the inventive bearing of the race 28 essentially only about the bearings 48 . 48.1 are at the camps 48 . 48.1 According to the second embodiment additionally sound-absorbing means 52 provided that the structure-borne noise when passing through the camp 48 . 48.1 dampen. For example, the sound-damping means 52 on the race 28 provided by this at least partially in the field of bearings 48 at its the camps 48 facing outside 51 For example, a sound-absorbing coating 52 having. For example, the outside is 51 of the race 28 completely with the coating 52 Mistake. The sound-absorbing means 52 but can also expressly at the camps 48 . 48.1 be arranged. The coating 52 is made of a sound-absorbing material, such as plastic or rubber, and the raceway 28 even made of a metal. The metal gives the race 28 a high rigidity, allowing a breaking of the race 28 is avoided.

At the the sealing bodies 39 facing inside 50 of the race 28 is another coating 53 provided, which reduces the wear on the raceway of the raceway 28 reduced and made of a wear-resistant material. The front sides of the race 28 are free of a coating according to the second embodiment 52 ,

5 shows a simplified sectional view of the mounted in the ring portion race according to the second and a third embodiment.

At the bearing in the ring section race after 5 are the opposite to the delivery unit after 1 to 4 Constant or equivalent parts by the same reference numerals.

The race 28 According to the second embodiment lies with its sound-absorbing Be stratification 52 at the camps 48 . 48.1 on, so at the camps 48 . 48.1 a structure-borne sound absorption takes place.

6 shows a third embodiment of the delivery unit according to the invention.

At the delivery unit after 6 are the opposite to the delivery unit after 1 to 5 Constant or equivalent parts by the same reference numerals.

The sound-absorbing means 52 are formed according to the third embodiment in that a damping layer 54 the race 28 completely encased. For example, the race is 28 completely encapsulated by means of injection molding technology. In this way forms the damping layer 54 also the further, wear-reducing coating 53 according to the second embodiment. The damping layer 54 also envelops the faces of the race 28 , so that in addition, the structure-borne sound passing over the end faces is attenuated. In this way, the noise of the delivery unit is particularly reduced.

The race 28 has an annular core 55 on the of the cushioning layer 54 is completely surrounded. The damping layer 54 is for example made of plastic and the core 55 for example, made of a metal.

The race 28 according to the third embodiment is as in the second embodiment with its sound-absorbing damping layer 54 at the camps 48 at.

Claims (10)

Delivery unit with a rotor mounted in a pump chamber having guide grooves on the circumference, in which sealing bodies are provided, which are guided in the radial direction with respect to a rotor axis on a raceway, which is surrounded by a ring portion of a pump housing, characterized in that the raceway ( 28 ) by means of circumferentially spaced bearings ( 48 . 48.1 ) in the ring section ( 43 ) is mounted circumferentially between the bearings ( 48 ) each at least one space ( 49 ) is formed. Delivery unit according to claim 1, characterized in that the bearings ( 48 . 48.1 ) on the ring section ( 43 ) and / or on the raceway ( 28 ) are formed. Delivery unit according to claim 1, characterized in that the bearings ( 48 . 48.1 ) are formed as web-shaped, rib-shaped, triangular or hump-shaped elevations. Delivery unit according to claim 1, characterized in that at the bearings ( 48 . 48.1 ) Means for soundproofing ( 52 ) are provided. Delivery unit according to claim 4, characterized in that the means for soundproofing ( 52 ) on the raceway ( 28 ) are formed. Conveying unit according to claim 5, characterized in that the raceway ( 28 ) is made exclusively of a sound-absorbing material. Conveying unit according to claim 5, characterized in that the raceway ( 28 ) on one of the camps ( 48 . 48.1 ) facing outside ( 51 ) at least in sections in the area of the bearings ( 48 . 48.1 ) a sound-damping coating ( 52 ) having. Conveying unit according to claim 5, characterized in that the raceway ( 28 ) with a damping layer ( 54 ) is sheathed. Conveying unit according to claim 1, characterized in that the raceway ( 28 ) by means of another warehouse ( 48.1 ) against rotation in the ring section ( 43 ) is stored. Delivery unit according to claim 1, characterized in that the pump chamber ( 14 ) frontally between a suction cover ( 26 ) and a pressure lid ( 27 ) is formed, wherein the ring section ( 43 ) of the valve housing ( 1 ) on the pressure lid ( 27 ) is trained.