CN112392766A

CN112392766A - Side flow pump

Info

Publication number: CN112392766A
Application number: CN201910755557.9A
Authority: CN
Inventors: 陈安邦; 于刚华; 张远春; 王海涛; 官新辉; 秦锐锋
Original assignee: Johnson Electric International AG
Current assignee: Johnson Electric International AG
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2021-02-23
Anticipated expiration: 2039-08-15
Also published as: CN112392766B; WO2021027720A1; DE202020005781U1

Abstract

The invention relates to the technical field of electromotion, and provides a side channel pump. The side flow pump comprises a casing and a cover body which are connected with each other, and an impeller accommodated in a pump cavity formed by the cover body and the casing, wherein the impeller is rotatably supported in the pump cavity, the cover body is provided with an inlet, the casing comprises a base and a side wall, a roughly tangential outlet which is in fluid communication with the inlet is arranged on the side wall, and the section of an inner cavity of the outlet, which is vertical to the flowing direction of the air flow, is non-circular. The side channel pump provided by the invention reduces pressure pulsation caused by airflow, thereby effectively reducing noise.

Description

Side flow pump

Technical Field

The invention relates to the technical field of electromotion, in particular to a side channel pump.

Background

Side channel pumps are typically used to deliver fuel or secondary air into the exhaust system. When used as an OPF (gasoline particulate filter) blower in automotive emission control, the side-channel pump not only promotes OPF regeneration, but also helps the promoter warm up after cold start. In order to be able to achieve the best possible delivery or high pressures, pulses are formed as a result of the sudden pressure surges of the delivered air flow, which leads to high noise levels.

Disclosure of Invention

In view of the above, the present invention aims to provide a side channel pump which may solve or at least reduce the above problems.

To this end, the invention provides a side-channel pump comprising a casing and a cover connected to one another, and an impeller housed in a pumping chamber formed by the cover and the casing, the impeller being rotatably supported in the pumping chamber, the cover being provided with an inlet, the casing comprising a base and a side wall provided with a substantially tangential outlet in fluid communication with the inlet, the outlet being non-circular in cross-section along an internal cavity perpendicular to the direction of flow of the gas stream.

In some embodiments, the inner cavity cross section is enclosed by a first inner edge, a second inner edge and a third inner edge which are sequentially connected end to end in the circumferential direction, and the first inner edge and the second inner edge are approximately in a V shape.

In some embodiments, the V-shape opens toward a radially outer side of the housing.

In some embodiments, the first inner edge forms a first angle α with the rotational axis of the impeller, the angular range of α being 0< α <90 °.

In some embodiments, the second inner edge forms a second angle β with the rotational axis of the impeller, β being in the range 0< β <90 °.

In some embodiments, the inner side of the side wall of the housing is provided with a protrusion extending radially inwardly, the protrusion being located downstream of the outlet and upstream of the inlet in the flow direction of the gas flow.

In some embodiments, the projection forms a first step adjacent to the inlet and a second step adjacent to the outlet on both circumferential sides, respectively, the first step and the second step extending obliquely toward each other in a direction of the base toward the cover.

In some embodiments, the side channel pump comprises an air flow channel communicating the inlet and the outlet, the air flow channel comprising: the cover comprises a cover body and a first channel formed on the cover body and extending along the circumferential direction of the cover body, and/or a second channel formed on a base of the shell and extending along the circumferential direction of the base.

In some embodiments, a bottom of the first step extends to the second channel, and a top of the first step is adjacent to the inlet.

In some embodiments, the cover is formed with a first channel extending along the circumferential direction, one end of the first channel is located at the inlet of the cover, and the other end of the first channel extends to a first inclined surface, the first inclined surface is opposite to the outlet of the housing, and the first inclined surface is inclined at an obtuse angle relative to the first channel.

In some embodiments, the base of the housing forms a circumferentially extending second channel having one end adjacent the outlet and the other end extending to a second ramp opposite the inlet of the cover, the second ramp being angled obtusely relative to the second channel.

The side flow pump provided by the invention reduces pressure pulsation caused by airflow, improves pneumatic audio noise and effectively reduces noise.

Drawings

Fig. 1 is a perspective assembly view of a side channel pump in accordance with an embodiment of the present invention.

Fig. 2 is a partially exploded view of the side channel pump shown in fig. 1.

Fig. 3 is a sectional view of the side channel pump shown in fig. 1.

Fig. 4 is a schematic view of a cap body of the side channel pump shown in fig. 1.

Fig. 5 is a schematic structural view of a housing of the side channel pump shown in fig. 1.

Fig. 6 is a plan view schematically illustrating the cap and the housing of the side channel pump shown in fig. 1 in an exploded state.

Fig. 7 is a schematic plan view of another angle of the side channel pump shown in fig. 1.

Fig. 8 is a schematic diagram of a cross-section of the lumen of the side-channel pump shown in fig. 1.

Reference numerals: a 100-side channel pump; 10-a cover body; 11-an inlet; 12-a first channel; 13-a first bevel; 14-a first interruption zone; 15-a groove; 19-a first connection hole; 20-a housing; 201-pump chamber; 21-a side wall; 210-an outlet; 211-lumen cross section; 212-first inner edge; 213-a second inner edge; 214-third inner edge; 22-a second channel; 221-gap; 23-an outlet section; 24-a convex portion; 241-a first step; 242 — a second step; 26-a second interruption zone; 27-a base; 271-motor housing; 272-a base; 28-a second bevel; 29-a second connection hole; 30-an impeller; 31-a blade; 32-mounting holes; 4-a drive shaft; 5-a seal; 6; a motor; a-a rotation axis; alpha-a first angle; beta-second angle.

Detailed Description

The invention will be described in detail with reference to the accompanying drawings and specific embodiments, so that the technical scheme and the beneficial effects of the invention are more clear. It is to be understood that the drawings are provided for purposes of illustration and description only and are not intended as a definition of the limits of the invention, but are drawn to scale.

Referring to fig. 1 to 3 together, a side flow path pump 100 according to an embodiment of the present invention includes a cover 10 and a casing 20 connected to each other, and an impeller 30 accommodated in a pump chamber 201 surrounded by the cover 10 and the casing 20. The impeller 30 is rotatably supported by the drive shaft 4 disposed in the housing 20. Specifically, the impeller 30 is provided at the center thereof with a mounting hole 32, and the impeller 3 is fixedly mounted on the drive shaft 4 through the mounting hole 32. In the present embodiment, the driving shaft 4 is a rotating shaft of a motor 6; it will be appreciated that the drive shaft 4 may also be a separate shaft member drivingly connected to the motor 6.

The housing 20 includes a base 27 and a sidewall 21. The side wall 21 is disposed around the base 27, and encloses a housing space for accommodating the impeller 30 together with the base 27. The cover 10 covers the top end of the side wall 21 to close the accommodating space, so as to form the pump chamber 201. The cover 10 is provided with an inlet 11 for the air flow into the pump chamber 201, the inlet 11 being arranged axially along the cover 10, preferably with the inlet 11 being located off-center of the cover 10. The side wall 21 of the housing 20 is provided with an outlet 210, said outlet 210 projecting substantially tangentially outwardly along the side wall 21, the outlet 210 communicating with the pump chamber 201. The impeller 30 is received in the pump chamber 201 and includes a plurality of radially outwardly extending vanes 31. When the impeller 30 rotates, the air flow enters the pump chamber 201 of the side flow pump 100 through the inlet 11 and flows along the pump chamber 201 by being driven by the blades 31 thereof, and is then discharged from the outlet 210. Therefore, in the rotation direction of the impeller 30, for example, in the angle shown in fig. 1 and 2, the rotation direction of the impeller 30 of the side-channel pump 100 is clockwise, and the inlet 11 is as far away from the outlet 210 as possible to increase the delivery power and pressure as much as possible.

In this embodiment, the housing 20 further includes a motor housing 271 extending downward from the periphery of the base 27 and a base 272 connected to the end of the motor housing 271. The stator, rotor, and other components of the motor 6 are housed in the motor housing 271.

Referring to fig. 3 and 4 together, the cover 10 is provided with a first generally arcuate channel 12 on the side facing the housing 20. The first channel 12 extends around the center of the cover 10. In this embodiment, the first channel 12 is substantially C-shaped and is recessed from the surface of the cover 10. The first channel 12 has one end located at the inlet 11 of the cover 10 and the other end extending to a first inclined surface 13 of the cover 10, wherein the first inclined surface 13 is opposite to the outlet 210 of the housing 20. Referring to fig. 3 and 5 together, in the present embodiment, the first slope 13 extends obliquely toward the outlet 210 at an obtuse angle with respect to the first channel 12 to reduce pressure pulsation caused by the air flow, thereby reducing noise.

Referring also to fig. 5, the side of the base 27 of the housing 20 facing the cover 10 is provided with a second channel 22 corresponding to the first channel 12. The second channel 22 is generally arcuate in shape and extends about the center of the housing 20. In the present embodiment, the radially outer periphery of the second passage 22 is located at the side wall 20. In this embodiment, the second channel 22 is also substantially C-shaped and is recessed from the surface of the base 27 of the housing 20. Preferably, the cross-sectional shape of the first channel 12 of the cover 10 is substantially the same as the cross-sectional shape of the second channel 22, both being substantially D-shaped. One end of the second channel 22 is connected to the outlet 210 through an outlet section 23. In the present embodiment, the outlet section 23 extends linearly and is also substantially D-shaped in cross-section, but the cross-sectional dimension of the outlet section 23 is smaller than the cross-sectional dimension of the second passage 22. The other end of the second channel 22 extends to a second inclined surface 28 of the base 27, and the second inclined surface 28 is opposite to the inlet 11 of the cover 10. The second ramp 28 extends obliquely towards the inlet 11 at an obtuse angle relative to the second passage 22.

Referring also to fig. 6, a first interruption zone 14 is formed between the inlet 11 of the cover 10 and the first inclined surface 13, and a second interruption zone 26 is formed between the outlet section 23 of the housing 20 and the second inclined surface 28. The first interruption zone 14 is flush with the top of the first ramp 13 and the second interruption zone 26 is flush with the top of the second ramp 28. In this embodiment, the first and

second interruption zones

14, 26 are opposite each other. Preferably, the first and

second interruption zones

14, 26 are parallel to each other. The arrangement of the first middle section 14 and the second interruption zone 26 each contributes to preventing short-circuit flow of the gas flow against the direction of rotation of the impeller 3.

The diameter of the impeller 30 is smaller than the inner diameter of the sidewall 21 of the housing 20 so that a gap 221 is formed between the impeller 30 and the housing 20. The outer diameters of the first passage 12 and the second passage 22 are slightly larger than the outer diameter of the impeller 30, so that the first passage 12 and the second passage 22 communicate with both axial ends of the gap 221, respectively.

Referring to fig. 2, 7 and 8 simultaneously, the outlet 210 of the housing 20 is non-circular along a cross-section 211 of the interior cavity perpendicular to the direction of airflow. In the present embodiment, the lumen cross-section 211 is configured in a substantially V-shape. To further clarify the shape of the lumen cross-section 211, fig. 8 shows the angular relationship of the lumen cross-section 211. The inner cavity cross section 211 is enclosed by a first inner edge 212, a second inner edge 213 and a third inner edge 214 which are circumferentially connected end to end. The first inner edge 212 and the second inner edge 213 are substantially V-shaped, which opens toward the radially outer side of the housing 20. The first inner edge 212 extends obliquely in a first direction from adjacent the cover 1 towards the base 27 and forms a first angle α with the axis a of rotation of the impeller 30, the angle α being in the range 0< α <90 °. The second inner edge 213 extends obliquely from the end of the first inner edge 212 towards the base 27 in a second direction opposite to the first direction and forms a second angle β with the rotation axis a of the impeller 30, the angle β being in the range 0< β <90 °. Preferably, α is 45 ° and β is 45 °. The third inner edge 214 is substantially a circular arc segment connecting two ends of the first inner edge 212 and the second inner edge 213. The design can reduce pressure pulsation caused by airflow and reduce noise.

Referring to fig. 2 and 5 together, further, the inner wall of the side wall 21 of the housing 20 is provided with a protrusion 24 protruding inward in the radial direction, so that a first step 241 and a second step 242 are formed at both sides of the protrusion 24 in the circumferential direction, respectively. The projection 24 is disposed between the outlet 210 of the housing 20 and the inlet 11 of the cover 10. The first step 241 is adjacent to the inlet 11 and located upstream of the inlet 11 (i.e., in front of the inlet 11 in the rotational direction of the impeller 30). The second step 242 is located adjacent to the outlet 210, downstream of the outlet 210 (i.e., behind the outlet 210 in the rotational direction of the impeller 30). The first step 241 and the second step 242 are each disposed obliquely with respect to the rotational axis a of the impeller 30 and extend obliquely toward each other from the base 27 toward the lid body 10, so that the length of the bottom of the projection 24 along the side wall 21 is greater than that of the top. The provision of the protrusion 24 can further reduce pressure pulsation caused by the air flow, thereby improving aerodynamic acoustic noise.

Fig. 6 is an exploded plan view schematically illustrating the cover 10 and the housing 20, wherein the cover 10 and the housing 20 are respectively located at one-to-one correspondence positions, so as to more clearly show the correspondence relationship between the two. Referring to fig. 5 and 6 together, in the present embodiment, the bottom of the first step 241 extends circumferentially beyond the second slope 28 of the housing 20 to the second channel 22. The top of the first step 241 is located directly above the second ramp 28. The bottom of the second step 242 abuts the inside of the outlet section 23 of the housing 20. Preferably, the second step 242 extends upwardly to the top of the side wall 21 of the housing 20 at an oblique angle tangential to the inside of the outlet section 23.

Referring to fig. 2, further, in the present embodiment, the cover 10 is provided at the outer edge thereof with a plurality of first coupling holes 19, and the case 20 is correspondingly provided with a plurality of second coupling holes 29. The fastening members may pass through the corresponding first coupling holes 19 and second coupling holes 29 to fixedly couple the cover body 10 to the case body 20. Referring to fig. 3, the cover 10 is provided with a circumferentially extending groove 15 radially outwardly of its first channel 12 for securing the seal 5 to form a seal between the cover 10 and the housing 20. Furthermore, preferably, the adjacent parts of the above areas are rounded.

The side channel pump provided by the invention reduces pressure pulsation caused by airflow through the non-circular inner cavity section 211 and/or the inclined first step 241 located at the upstream of the inlet 11 and/or the inclined second step 242 located at the downstream of the outlet 210, thereby effectively reducing noise.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-listed embodiments, and any simple changes or equivalent substitutions of technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the protection scope of the present invention.

Claims

1. A side-channel pump comprising a housing (20) and a cover (10) connected to each other, and an impeller (30) accommodated in a pump chamber (201) formed by the cover (10) and the housing (20), the impeller (30) being rotatably supported in the pump chamber (201), the cover (10) being provided with an inlet (11), the housing (20) comprising a base (27) and a side wall (21), the side wall (21) being provided with a substantially tangential outlet (210) in fluid communication with the inlet (11), characterized in that the outlet (210) is non-circular in cross-section (211) of the inner chamber perpendicular to the flow direction of the air flow.

2. A side channel pump according to claim 1, wherein the inner chamber cross-section (211) is enclosed by a first inner edge (212), a second inner edge (213) and a third inner edge (214) circumferentially connected end to end, the first inner edge (212) and the second inner edge (213) being substantially configured in a V-shape.

3. A side channel pump according to claim 2, wherein the V-shape opens towards a radially outer side of the housing (20).

4. A side channel pump according to claim 2, wherein the first inner edge (212) forms a first angle a with the rotational axis (a) of the impeller (30), the angle a being in the range 0< a <90 °.

5. A side channel pump according to claim 2, wherein the second inner edge (213) forms a second angle β with the rotational axis (a) of the impeller (30), β being in the range 0< β <90 °.

6. A side channel pump according to claim 1, wherein the inner side of the side wall (21) of the housing (20) is provided with a radially inwardly convexly extending protrusion (24), the protrusion (24) being located downstream of the outlet (210) and upstream of the inlet (11) in the flow direction of the gas flow.

7. A side channel pump according to claim 6, wherein the convex portion (24) forms a first step (241) and a second step (242) on both sides in the circumferential direction, respectively, the first step (241) being adjacent to the inlet (11), the second step (242) being adjacent to the outlet (210), the first step (241) and the second step (242) extending obliquely toward each other in a direction of the base (27) toward the cover body (10).

8. A side channel pump according to claim 7, comprising an air flow channel communicating the inlet (11) and the outlet (210), the air flow channel comprising: a first channel (12) formed on the cover body (10) and extending along the circumferential direction of the cover body (10), and/or a second channel (22) formed on a base (27) of the housing (20) and extending along the circumferential direction of the base (27).

9. A side channel pump according to claim 8, wherein the bottom of the first step (241) extends to the second channel (22), and the top of the first step (241) is adjacent to the inlet (11).

10. A side channel pump according to any one of claims 1 or 6, wherein the cap (10) is formed with a first channel (12) extending in a circumferential direction, one end of the first channel (12) is located at the inlet (11) of the cap (10), and the other end thereof extends to a first inclined surface (13), the first inclined surface (13) is disposed opposite to the outlet (210) of the housing (20), and the first inclined surface (13) is inclined at an obtuse angle with respect to the first channel (12).

11. A side channel pump according to claim 1 or 6, wherein the base (27) of the housing (20) forms a second circumferentially extending channel (22), one end of the second channel (22) adjoining the outlet (210) and the other end extending to a second ramp (28), the second ramp (28) being opposite the inlet (11) of the cap (10), the second ramp (28) being obtusely inclined relative to the second channel (22).