CN111406155B

CN111406155B - Side channel blower

Info

Publication number: CN111406155B
Application number: CN201880076805.0A
Authority: CN
Inventors: 亚历山大·高特; 托马斯·约斯根; 佩特拉·戴特; 阿尔佩·卡潘; 科瑞山·范德比克; 马蒂亚斯·布托罗斯-米哈伊尔
Original assignee: Pierburg GmbH
Current assignee: Pierburg GmbH
Priority date: 2017-12-21
Filing date: 2018-04-10
Publication date: 2022-04-29
Anticipated expiration: 2038-04-10
Also published as: EP3728860B1; CN111406155A; WO2019120633A1; EP3728860A1

Abstract

Side channel blowers with means for minimising noise emissions are known, however they are often still deficient and limit the volume flow that needs to be delivered or have lower efficiency. Therefore, the present invention proposes a side channel blower, wherein the first side edge (64) and the second side edge (66) are stretched into a first plane E ₁ , the first plane E ₁ being stretched with the discharge opening ( 60 ) The formed second plane E ₂ forms an angle α≧30°, in this way the outlet opening ( 62 ) projects into the radial boundary wall ( 33 ). By means of such an embodiment, the efficiency and the maximum volume flow to be delivered can be significantly increased.

Description

Side channel blower

Technical Field

The invention relates to a side channel blower, in particular a secondary blower for an internal combustion engine, having a multipart housing with at least one first housing part, which is designed as a tank part, and a second housing part, which is designed as a cover part, wherein the tank part and the cover part are connected to one another in a boundary plane by an interposed sealing element and enclose a blower chamber, wherein an inlet opening and an outlet opening are formed, which opening via an inlet region into at least one substantially annularly extending conveying channel with a radial boundary wall, having an impeller which can be driven by a drive unit, is rotatably mounted in the housing and has conveying blades which cooperate with the opposite conveying channel, and having an interruption region between the inlet opening and the outlet opening, in the interruption region, the at least one conveying channel is interrupted in the circumferential direction, wherein the outlet has an outlet channel section, to which the at least one conveying channel opens, wherein the outlet channel section has an outward discharge opening and an outlet opening directed toward the conveying channel, which outlet opening has a first side edge and a second side edge, wherein the first side edge is part of the interruption region and the second side edge is part of the radial boundary wall.

Background

Such side channel blowers or side channel pumps are known and have been described in a number of applications. In motor vehicles, these side channel blowers are used, for example, for transporting fuel or blowing secondary air into the exhaust system. The drive is typically achieved by an electric motor which can drive the impeller. The impeller is substantially configured at its circumference such that it forms a circumferential swirl channel with the axially opposite feed channel. The conveying blades project perpendicularly from the portion of the impeller forming the swirl channel in the direction of the opposite portion of the conveying channel configured in the housing, so that pockets are formed between the conveying blades. When the impeller rotates, the fluid conveyed in the pockets is accelerated in the circumferential direction and the radial direction by the conveying blades, so that a circumferential vortex is generated in the conveying passage.

Side channel blowers are known in which only one supply channel is formed on the axial side of the impeller in the housing part, while the two supply channels are formed on both axial sides of the impeller of the side channel blower of the other type, wherein the two supply channels are fluidically connected to one another. For such side channel blowers, one of the conveying channels is formed in a housing part serving as a cover, while the other conveying channel is formed in a housing part to which a drive unit is usually attached, the impeller being arranged on the shaft of the drive unit at least in a rotationally fixed manner.

In order to obtain the best possible transport or pressure increase, it is necessary to use as large a part as possible of the circumference of the transport channel. The inlet and the outlet must therefore be as far apart as possible circumferentially in the direction of operation of the impeller, wherein the short-circuit flow between the inlet and the outlet is prevented by the interruption region. The problem with this type of side channel blower has proven to be the presence of high noise, particularly due to pulsations created by sudden pressure surges in the delivered air.

Such pressure surges occur in particular immediately after each conveyor blade has swept over the beginning of the interruption zone, since compressed air is still present in the pockets between the conveyor blades, which compressed air has not yet been completely discharged through the outlet, and when the interruption zone is reached, it suddenly accelerates towards the wall surface. This results in a significant increase in noise emissions.

To avoid this, DE 102009006652 proposes a pump for conveying a fluid, the outlet opening of the outlet being designed in a special manner. However, it has been found that, although the pressure surge can be reduced and the noise emission correspondingly reduced, the efficiency is still too low. Also, it is still desirable to increase the maximum flux possible.

Disclosure of Invention

The object of the invention is therefore to create a side channel blower with which the above-mentioned disadvantages can be avoided in a simple and inexpensive manner.

In the radially inner region of the impeller, the fluid flows between the rotor blades and leaves the pockets between the conveyor blades in the radially outer region.

Thus, the first and second side edges open into a first plane E₁The first plane E₁And a second plane E formed by the discharge opening₂At an angle alpha of more than or equal to 30 DEG, in such a way that the outlet opening extends into the radial boundary wall at the outlet from the conveying channel to the outletTrue tangential flow can occur in the transition region of the channel section. Thus, efficiency can be fundamentally improved, and higher operating pressures can also be achieved.

Advantageously, the separating surface extends at the level of or below the bottom surface of the transport channel in the cover part, so that the outlet channel part can be designed larger on average, so that the throughput can be increased again. The separating surface can advantageously extend in a stepped manner and can be designed as a liquid-tight sealing element in the groove. In this way it is ensured that no sealing material enters the blower chamber.

Connecting the cover part to the drive unit makes it possible to achieve an arrangement which is particularly easy to manufacture. In this case, a bore for mounting the drive shaft is to be provided in the cover part. The tank portion then closes the side channel blower from the outside.

Thus, a side channel blower is provided, wherein the efficiency and the maximum achievable throughput can be significantly increased in comparison with known side channel blowers.

Drawings

Embodiments of a side channel blower according to the present invention are illustrated in the drawings and described below.

Fig. 1 shows a side view of a side channel blower in a sectional view.

FIG. 2 shows a perspective view of a tank portion of the side channel pump of FIG. 1.

FIG. 3 shows a top view of the tank portion of the side channel pump of FIG. 1.

Detailed Description

The side channel blower illustrated in fig. 1 consists of a two-part housing 2 and an impeller 4, for example for conveying air, the impeller 4 being rotatably mounted in the housing 2 and being driven by a drive unit 3. The air reaches the inlet region 8 (see fig. 2) of the first housing part 10, which in the present embodiment serves as a tank part of the side channel blower, through the axial inlet 6. The air then flows from the inlet region 8 into two substantially annularly extending

conveying channels

12, 14, wherein a first conveying channel 12 is formed in the cover part 10 and a second conveying channel 14 is formed in a second housing part 16, which second housing part 16 serves in the present embodiment as a cover part of the side channel blower. Thus, the tank portion 10 and the lid portion 16 enclose a blower chamber 17.

The cover part 16 has a central opening 15, in which central opening 15 a bearing 18 of a drive shaft 19 of the drive unit 3 is also arranged, on which bearing the impeller 4 is fixed. The air is discharged through a tangential outlet 20 arranged in the first housing part 10.

The impeller 4 is arranged between the tank part 10 and the cover part 16 and has on its circumference several conveying vanes 22 which are curved and extend radially, which conveying vanes 22 are divided by means of a radially extending circumferential ring 24 into a first row which is axially opposite the first conveying channel 12 and a second row which is axially opposite the second conveying channel 14, so that two swirl channels are formed, which are formed by the opposite parts of one of the

conveying channels

12, 14 and the impeller 4, respectively. The outer diameter of the

feed channels

12, 14 is slightly larger than the outer diameter of the impeller 4, so that there is a fluid connection between the two

feed channels

12, 14 on the outer circumference of the impeller 4, so that an air exchange between the two

feed channels

12, 14 is possible. Between the conveying blades 22 extending from the circumferential ring 24, therefore, radially outwardly open pockets 26 are formed, in which the air is conveyed or accelerated, so that its pressure increases over the length of the

conveying channels

12, 14.

In order to obtain an optimum delivery rate and pressure increase, the axial inlet 6 is as far away as possible from the tangential outlet 20 in the direction of rotation of the impeller 4. In order to reliably prevent short-circuit flows from the inlet 6 to the outlet 20 counter to the direction of rotation of the impeller 4, there are known interruption regions 28 between the inlet 6 and the outlet 20, on the tank part 10 and on the cover part 16. However, in fig. 2, only the interruption zone 28 in the can body part 10 is shown. In the interruption region 28, there is therefore as little clearance as possible in the axial direction relative to the conveying blades 22 of the impeller 4. A further interruption region 32 is formed on a radial boundary wall 33 of the first housing part 10 and interrupts a radially outer connecting region 35 between the two

feed channels

12, 14.

The can portion 10 is secured to the second lid portion 16 by screws, not shown, which pass through corresponding holes 34 formed in a radially outwardly extending projection 36 of the can portion 10. The cover part 16 is then connected to a housing part 38 of the drive unit 3 in a known manner.

Radially behind the wall 40 of the conveying channel 16, a recess 42 is formed at the level of the bottom surface of the conveying channel 14. In this way the interface 46 between the can portion 10 and the lid portion 16 extends stepwise. Therefore, it is possible to provide the sealing member 48 as a liquid seal in the groove 42 for sealing between the tank portion 10 and the lid portion 16, because the sealing member 48 as a liquid seal is not directly connected to the blower chamber 17.

Radially in front of the wall 50 of the conveying channel 12, an annular web 52 is formed, which annular web 52 engages in a corresponding recess 54 in the impeller 4 after assembly of the blower, as a result of which the sealing of the conveying channel 12 is achieved in the direction of the interior of the impeller 4. Furthermore, the can part 10 has a cylindrical recess 56 into which the drive shaft 19 of the drive unit 3 projects.

As is known in the art, the outlet 20 has a tangential outlet channel portion 58, the tangential outlet channel portion 58 leading outwardly to an exhaust 60. The

delivery channels

12, 14 are fluidly connected to the outlet channel portion 58 by an outlet opening 62. According to the invention, the first side edge 64 and the second side edge 66 open out into a first plane E₁The first plane E₁And a second plane E formed by the discharge opening₂At an angle alpha ≧ 30 deg., here approximately 57 deg. (see in particular fig. 3). This results in the outlet opening 62 projecting far into the radial boundary wall 33, so that a "true" tangential outflow can be achieved with high efficiency. In a particularly simple manner, at least the can body part 10 can be produced as a workpiece (werkzeugfallendes Werkst ü ck) after the removal from the tool without further processing in a thermosetting plastic.

It should therefore be clear that various modifications can be made to the side channel blower described in the exemplary embodiment without departing from the scope of protection of the main claim. In particular, it may be a pump with only one side channel, or the outlet opening and the interruption shape may be designed with reference to a channel directed towards the inlet and directed towards the opposite channel, which conducts a larger flow.

Claims

1. A side channel blower having

A multi-part housing (2) with at least a first housing part (10) and a second housing part (16), the first housing part (10) being designed as a tank part, the second housing part is designed as a cover part (16), wherein the tank part (10) and the cover part (16) are connected in the interface (46) by an intermediate sealing member (48) are connected to each other and enclose a blower chamber (17), wherein an inlet (6) and an outlet (20) are formed, which open via the inlet region (8) into at least one with a radial boundary wall (33). a substantially annularly extending delivery channel (12, 14),

An impeller (4), which can be driven by a drive unit (3), is rotatably mounted in the housing (2) and has a conveying cooperating with the opposite conveying channels (12, 14). blade (22), and

In an interruption region ( 28 , 32 ) between the inlet ( 6 ) and the outlet ( 20 ), at least one of the conveying channels ( 12 , 14 ) is interrupted in the circumferential direction in the interruption region, wherein ,

The outlet (20) has an outlet channel portion (58) into which at least one of the delivery channels (12, 14) leads, wherein the outlet channel portion (58) has an outward discharge (58). 60) and an outlet opening (62) with a first side edge and a second side edge (64, 66) directed towards the delivery channel (12, 14), wherein the first side edge (64) is the part of said interrupted region (32), and said second side edge (66) is part of said radial boundary wall (33),

It is characterized in that,

The first side edge (64) and the second side edge (66) form a first plane E ₁ , and the first plane forms a second plane (E ₂ ) formed by the discharge opening ( 60 ). An angle α>30°, in this way the outlet opening ( 62 ) projects into the radial boundary wall ( 33 ).

2. Side channel blower according to claim 1, characterized in that the interface (46) is at the level of the bottom surface of the delivery channel (14) in the cover part (16) or at the The bottom surface of the conveying channel extends below.

3. The side channel blower according to claim 2, wherein the interface (46) extends in a stepped shape, and the sealing member (48) as a liquid seal is formed in the groove (42) ).

4. Side channel blower according to any of the preceding claims, characterized in that the cover part (16) is connected to the drive unit (3).

5. Side channel blower according to claim 1 or 2, characterised in that at least the tank part (10) can be manufactured in thermoset plastic as a workpiece which does not require further processing after being released from the tool.