CN111406155A - Side channel blower, in particular secondary blower for an internal combustion engine - Google Patents

Abstract

Side-channel blowers with devices for minimizing noise emissions are known; however, they are generally inadequate and can limit the volumetric flow rate to be delivered or have low efficiency. Therefore, the present invention proposes a side-channel blower in which a first side edge (64) and a second side edge (66) are stretched to form a first plane _{E1 ,} which forms an angle α ≥ 30° with a second plane _E2 stretched by the outlet (60), thereby allowing the outlet opening (62) to extend into the radial boundary wall (33). With this embodiment, efficiency and the maximum volumetric flow rate to be delivered can be significantly improved.

Description

Side channel blowers, especially secondary blowers for internal combustion engines

technical field

The invention relates to a side channel blower, in particular a secondary blower for an internal combustion engine, having a multi-part housing with at least a first housing part and a second housing part, the first housing part The housing part is designed as a tank part and the second housing part is designed as a cover part, wherein the tank part and the cover part are connected to each other in the interface by an intermediate sealing member and enclose a blower chamber, wherein , an inlet and an outlet are formed which lead via the inlet region to at least one substantially annularly extending conveying channel with radial boundary walls, the side channel blower having an impeller which can be driven by a drive unit to be rotatable is mounted in the housing in such a way that it has conveying vanes cooperating with opposing conveying channels, and the side channel blower has an interrupted area between the inlet and the outlet in which at least one conveying channel is in the circumferential direction is interrupted at the top, wherein the outlet has an outlet channel portion to which at least one conveying channel leads, wherein the outlet channel portion has an outward discharge opening and a first side edge and a second side edge directed towards the conveying channel The outlet opening of , wherein the first side edge is part of the interrupted region and the second side edge is part of the radial boundary wall.

Background technique

Such side channel blowers or side channel pumps are known and have been described in various applications. In motor vehicles, these side channel blowers are used, for example, to deliver fuel or to blow secondary air into the exhaust system. Drive is usually accomplished by an electric motor, which drives the impeller. The impeller is substantially configured at its circumference such that it forms a circumferential swirl channel with the axially opposite delivery channel. The conveying vanes project perpendicularly from the portion of the impeller forming the swirl channel in the direction of the opposite portion of the conveying channel constructed in the casing, so that pockets are formed between the conveying vanes. When the impeller rotates, the fluid conveyed in the pockets is accelerated in the circumferential and radial directions by the conveying vanes, so that a circumferential vortex is generated in the conveying channel.

One type of side channel blower is known, in which only one conveying channel is formed on the axial side of the impeller in the housing part, while another type of side channel blower has a conveying channel formed on both axial sides of the impeller, at Thus, the two delivery channels are fluidly connected to each other. For this type of side channel blower, one of the delivery channels is formed in the housing part serving as a cover and the other delivery channel is formed in the housing part to which the drive unit is usually attached, the impeller at least in a torsion-resistant manner Arranged on the shaft of the drive unit.

In order to obtain the best possible delivery or pressure increase, the greatest possible portion of the circumference of the delivery channel must be used. Therefore, the inlet and outlet must be as far apart as possible circumferentially in the running direction of the impeller, where a short-circuit flow between inlet and outlet is prevented by interrupting regions. A problem with this type of side channel blower has been proven to be high noise, especially due to pulsations caused by sudden pressure shocks in the conveyed air.

This type of pressure shock occurs especially immediately after each conveyor blade sweeps over the beginning of the interruption area, because compressed air is still present in the pockets between the conveyor blades, which has not yet been fully expelled through the outlet, when the interruption is reached. area, it suddenly accelerates towards the wall. This results in a significant increase in noise emissions.

To avoid this, a pump for conveying fluid is proposed in DE 10 2009 006 652, the outlet opening of the outlet being designed in a special way. However, it turns out that although the pressure shock can be reduced and the noise emissions correspondingly reduced, the efficiency is still too low. Also, it is still desirable to increase the maximum flux possible.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to invent a side channel blower with which the above mentioned disadvantages can be avoided in a simple and inexpensive manner.

This technical problem is partly solved by the features of the main claim. In the radially inner region of the impeller, the fluid flows between the rotor blades and leaves the pockets between the conveying blades in the radially outer region.

Therefore, the first side edge and the second side edge are stretched to form a first plane E ₁ , which forms an angle α≥30° with the _{second plane E 2 stretched} by the discharge opening, in this way, The outlet opening protrudes into the radial boundary wall, and a true tangential flow can take place in the transition region from the delivery channel to the outlet channel portion of the outlet. Thus, efficiency can be fundamentally improved and higher working pressures can also be achieved.

Advantageously, the dividing surface extends at the level of the bottom surface of the conveying channel in the cover part or below the bottom surface of the conveying channel in the cover part, so that the outlet channel part can be constructed larger on average and thus the throughput can be increased again. In this case, the interface can advantageously extend in a stepped manner and can be formed in the groove as a liquid-tight sealing member. In this way it is ensured that no sealing material enters the blower chamber.

Connecting the cover part to the drive unit enables a particularly easy-to-manufacture arrangement. Here, holes for mounting the drive shaft should be provided in the cover part. The tank portion then encloses the side channel blower with respect to the outside.

Accordingly, a side channel blower is provided wherein the efficiency and maximum achievable flux can be significantly increased compared to known side channel blowers.

Description of drawings

An embodiment of a side channel blower according to the invention is shown in the drawings and described below.

Figure 1 shows a side view of a side channel blower in cross section.

FIG. 2 shows a perspective view of the 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 ways

The side channel blower illustrated in FIG. 1 consists of a two-part housing 2 and, for example, an impeller 4 for conveying air, which is rotatably mounted in the housing 2 and driven by a drive unit 3 . The air passes through the axial inlet 6 to the inlet region 8 (see Fig. 2) of the first housing part 10, which in this embodiment serves as the tank part of the side channel blower. The air then flows from the inlet region 8 into two substantially annularly extending delivery channels 12 , 14 , wherein the first delivery channel 12 is formed in the cover part 10 and the second delivery channel 14 is formed in the second housing part 16 . In this embodiment, this second housing part 16 serves as the cover part of the side channel blower. Thus, the tank portion 10 and the lid portion 16 surround the blower chamber 17 .

The cover part 16 has a central opening 15 in which the bearing 18 of the drive shaft 19 of the drive unit 3 is also arranged, on which bearing the impeller 4 is fastened. The air is discharged through tangential outlets 20 arranged on 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 a number of conveying vanes 22 which are curved and extend radially, which are divided into axially and radially by a radially extending circumferential ring 24 A first opposite row of delivery passages 12 and a second row axially opposite to second delivery passages 14 so as to form two vortex passages formed by one of the delivery passages 12, 14 and the opposite portion of the impeller 4, respectively form. The outer diameter of the delivery channels 12 , 14 is slightly larger than the outer diameter of the impeller 4 so that there is a fluid connection between the two delivery channels 12 , 14 on the outer circumference of the impeller 4 , thus enabling the flow between the two delivery channels 12 , 14 air exchange. Thus, radially outwardly open pockets 26 are formed between the conveying vanes 22 extending from the circumferential ring 24 in which the air is conveyed or accelerated so that its pressure increases over the length of the conveying channels 12 , 14 .

For optimum delivery rate and pressure build-up, 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 a short-circuit flow from the inlet 6 to the outlet 20 against the direction of rotation of the impeller 4 , there are known interruption areas 28 on the tank part 10 and on the cover part 16 between the inlet 6 and the outlet 20 . . In Figure 2, however, only the interrupted area 28 in the tank portion 10 is shown. Therefore, in the interruption region 28 there is as little play as possible in the axial direction relative to the conveying blades 22 of the impeller 4 . Another interruption region 32 is formed on the radial boundary wall 33 of the first housing part 10 and interrupts the radially outer connecting region 35 between the two conveying channels 12 , 14 .

The can body part 10 is fixed to the second cover part 16 by screws, not shown, passing through corresponding holes 34 formed in the radially outwardly extending protrusions 36 of the can body part 10 . The cover part 16 is then connected to the housing part 38 of the drive unit 3 in a known manner.

Radially rearward of the wall 40 of the delivery channel 16 , a groove 42 is formed at the level of the bottom surface of the delivery channel 14 . In this way, the interface 46 of the tank part 10 and the lid part 16 extends stepwise. Therefore, a sealing member 48 as a liquid seal can be provided 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 .

An annular web 52 is formed radially forward of the wall 50 of the conveying channel 12 , which engages in corresponding grooves 54 in the impeller 4 after the blower has been assembled, thus in the direction towards the interior of the impeller 4 . The sealing of the delivery channel 12 is achieved. Furthermore, the tank part 10 has a cylindrical recess 56 into which the drive shaft 19 of the drive unit 3 projects.

As is known from the prior art, the outlet 20 has a tangential outlet channel portion 58 which leads outwardly to the discharge opening 60 . The delivery channels 12 , 14 are fluidly connected to the outlet channel portion 58 through the outlet opening 62 . According to the present invention, the first side edge 64 and the second side edge 66 are stretched to form a first plane E ₁ , the first plane E ₁ and the second plane E ₂ stretched by the discharge opening form an angle α≥30°, at This is approximately 57° (see in particular Figure 3). This results in the outlet opening 62 protruding 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 tank part 10 can be produced from a thermosetting plastic as a workpiece that does not require further processing after removal from the tool.

Therefore, it should be clear that various modifications may be made to the side channel blower described in the exemplary embodiments without departing from the scope of protection of the main claims. In particular, it can be a pump with only one side channel, or the outlet openings and interruption shapes can be designed with reference to the channel leading the larger flow, directed towards the inlet, for the opposite channel.

Claims (5)

1. A side channel blower, in particular a secondary blower for an internal combustion engine, having

A multi-part housing (2) having at least one first housing part (10) and one second housing part (16), the first housing part (10) being designed as a tank part and the second housing part being designed as a cover part (16), wherein the tank part (10) and the cover part (16) are connected to one another in a separating plane (46) by an interposed sealing element (48) and enclose a blower chamber (17), wherein an inlet (6) and an outlet (20) are formed, which open via an inlet region (8) into at least one substantially annularly extending conveyor channel (12, 14) having a radial boundary wall (33),

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

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

the outlet (20) has an outlet channel section (58) to which the at least one conveying channel (12, 14) opens, wherein the outlet channel section (58) has an outward discharge opening (60) and an outlet opening (62) directed toward the conveying channel (12, 14) having a first side edge and a second side edge (64, 66), wherein the first side edge (64) is part of the interruption region (32) and the second side edge (66) is part of the radial boundary wall (33),

it is characterized in that the preparation method is characterized in that,

the first side edge (64) and the second side edge (66) open out into a first plane E₁The first plane and a second plane (E) spanned by the discharge opening (60)₂) At an angle α>30 DEG, in this way the outlet opening (62) protrudes into the radial boundary wall (33).

2. Side channel blower, in particular secondary blower for an internal combustion engine, according to claim 1, characterised in that the dividing plane (46) extends at the level of or below the bottom surface of the conveying channel (14) in the cover part (16).

3. Side channel blower, in particular secondary blower for an internal combustion engine, according to claim 2, characterised in that the separating surface (46) extends in a stepped manner and the sealing member (48) is formed as a liquid seal in the groove (42).

4. Side channel blower, in particular secondary blower for an internal combustion engine, according to one of the preceding claims, characterised in that the cover part (16) is connected with the drive unit (3).

5. Side channel blower, in particular secondary blower for internal combustion engines, according to claim 1 or 2, characterised in that at least the tank part (10) can be manufactured in thermosetting plastic as a workpiece without further treatment after removal from the tool.

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