CN212774935U

CN212774935U - Axial guide vane structure for centrifugal pump

Info

Publication number: CN212774935U
Application number: CN202021439837.3U
Authority: CN
Inventors: 汪国洪; 李涛; 朱登凯; 沈莫华
Original assignee: Huzhou Sanjing Cryogenic Equipment Co ltd
Current assignee: Huzhou Sanjing Cryogenic Equipment Co ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2021-03-23
Anticipated expiration: 2030-07-21

Abstract

The utility model provides an axial guide vane structure for a centrifugal pump, which comprises a rotating shaft, a middle section, a guide vane and an impeller, wherein the middle section is provided with a main liquid outlet and a main liquid inlet; the guide vane comprises a base body and a return guide vane, the top wall of the return guide vane is attached to the inner wall of one side of the base body, the return guide vane is provided with a guide vane liquid outlet and a guide vane liquid inlet, and the guide vane liquid outlet is communicated with the main liquid outlet; the impeller is provided with an impeller liquid outlet and an impeller liquid inlet, the impeller liquid outlet extends to the position with the largest outer diameter of the impeller and is communicated with the guide vane liquid inlet, and the impeller liquid inlet is communicated with the main liquid inlet; the laminating of impeller inner wall is equipped with radial stator, radial stator about the axis central symmetry of axis of rotation sets up. The utility model discloses compact structure has reduced the size of stator and relevant part, has practiced thrift manufacturing cost.

Description

Axial guide vane structure for centrifugal pump

Technical Field

The utility model relates to a stator structure mode of the required centrifugal pump configuration of trades such as chemical industry, industrial and mining enterprises, national defense scientific research specifically is an axial stator structure for centrifugal pump.

Background

The guide vane is a rotary energy device of the centrifugal pump and is used for collecting liquid thrown out by the impeller, so that the flow velocity of the liquid is reduced, and after part of velocity energy head is converted into pressure energy head, the pressure energy head is uniformly introduced into the next stage or is discharged through the diffusion pipe. At present, a centrifugal pump liquid outlet guide vane usually adopts a radial structure (shown in figure 3) and an axial structure (shown in figure 4), the axial size of the guide vane of the radial structure is small, but the radial size is larger as the collection and diffusion functions of liquid flow are required to be met, the outer diameter size of the guide vane is usually (1.3-1.5) D2, the radial size of a shell is large, the wall thickness of parts is thicker, and the centrifugal pump liquid outlet guide vane is not suitable for occasions with higher requirements on the radial size; the guide vane of the axial structure is small in radial size, but large in axial size, the outer diameter size of the guide vane is usually (0.6-0.8) D2, the pump space volume and the material consumption are increased, and the production cost is increased.

Disclosure of Invention

In order to solve under the above-mentioned two kinds of structures, radial or the bigger than normal problem of axial dimension, the utility model provides a novel axial stator structure has shortened the axial dimension and the radial dimension of stator for each part is compacter.

In order to realize the purpose, the utility model discloses a following technical scheme realizes:

an axial guide vane structure for a centrifugal pump comprises a rotating shaft, a middle section, a guide vane fixedly connected with the middle section and an impeller arranged between the middle section and the guide vane, wherein a main liquid outlet and a main liquid inlet are formed in the middle section; the guide vane comprises a base body and a return guide vane, the top wall of the return guide vane is attached to the inner wall of one side of the base body, the return guide vane is provided with a guide vane liquid outlet and a guide vane liquid inlet, and the guide vane liquid outlet is communicated with the main liquid outlet; the impeller is provided with an impeller liquid outlet and an impeller liquid inlet, the impeller liquid outlet extends to the position with the largest outer diameter of the impeller and is communicated with the guide vane liquid inlet, and the impeller liquid inlet is communicated with the main liquid inlet; the laminating of impeller inner wall is equipped with radial stator, radial stator about the axis central symmetry of axis of rotation sets up.

Specifically, the middle section, the impeller with the stator is on same central line, the axis of rotation runs through the middle section, the impeller with the stator.

Specifically, fixedly connected with axle sleeve in the axis of rotation, the impeller laminating sets up the one end of axle sleeve, fixed connection is in the axis of rotation.

Preferably, the return guide vanes are arranged in a central symmetry mode about the axis of the rotating shaft, the guide vane liquid inlet is arranged at the position of the maximum inner diameter of the middle section, the inner wall of the return guide vane at one end of the guide vane liquid outlet and the axial direction of the rotating shaft form an included angle, and the included angle is 10-20 degrees.

Preferably, the impeller liquid outlet with be equipped with the cavity between the stator inlet, the cavity is including preventing the impeller with the middle section or the vertical section that the stator collided and the horizontal section that is used for the fluid transition are close to middle section one side the vertical section with horizontal section adopts the fillet transition.

Preferably, the inner wall of the radial guide vane, which is close to one end of the liquid inlet of the impeller, forms an included angle with the axial direction of the rotating shaft, and the included angle is 10-20 degrees.

Preferably, one end, close to the liquid inlet, of the impeller is connected with the middle section in a sealing mode through a first sealing opening ring, and the outer wall of the shaft sleeve is connected with the inner wall, at the center of the guide vane, of the guide vane shaft hole in a sealing mode through a second sealing opening ring.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the radial guide vane is added into the impeller without adopting a positive guide vane structure, so that the axial size of the guide vane is reduced, and the space size of the flow passage component is reduced.

2. Through setting up the stator inlet at the biggest internal diameter department, reduced the overall dimension of anti-stator, further practiced thrift the space size of overflowing parts.

3. The size of the guide vane and related parts is reduced, and the manufacturing cost is saved.

4. Multistage pump adopts the utility model discloses a behind the stator structure, the structure is compacter, has improved the reliability of unit operation.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a cross-sectional structural schematic view of a radial structure vane of the prior art;

FIG. 4 is a cross-sectional structural schematic view of an axial structure vane of the prior art.

In the figure: 1-rotating shaft, 11-shaft sleeve, 12-second sealing opening ring, 2-middle section, 21-main liquid outlet, 22-main liquid inlet, 23-first sealing opening ring, 24-bolt, 25-screw hole groove, 3-guide vane, 31-base body, 311-screw hole, 32-reverse guide vane, 321-guide vane liquid outlet, 322-guide vane liquid inlet, 323-reverse guide vane inner wall, 33-guide vane shaft hole, 4-impeller, 41-impeller liquid outlet, 42-impeller liquid inlet, 43-radial guide vane, 431-radial guide vane inner wall, 5-cavity, 51-longitudinal section and 52-transverse section.

Detailed description of the preferred embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 3 and 4, the present invention provides an embodiment: an axial guide vane structure for a centrifugal pump comprises a rotating shaft 1, a middle section 2, a guide vane 3 and an impeller 4; one end of the middle section 2 close to the main liquid inlet 22 is provided with a screw hole groove 25 and a bolt 24, the guide vane 3 is provided with a screw hole 311 matched with the bolt, and the screw hole groove 25, the screw hole 311 and the bolt 24 do not penetrate through a fluid channel of the counter guide vane 32; the guide vane 3 is matched with the bolt 24 through the screw hole groove 25 and the screw hole 311, and is fixedly connected with one end of the next-stage middle section 2 close to the main liquid inlet 22, one end of the middle section 2 close to the main liquid outlet 21 is arranged at one end of the next-stage middle section 2 close to the main liquid inlet 22 in a fitting manner, and is in interference connection with the guide vane 3; the middle section 2, the guide vane 3 and the impeller 4 are positioned on the same central line, and the rotating shaft 1 penetrates through the middle section 2, the guide vane 3 and the impeller 4; the rotating shaft 1 is fixedly connected with a shaft sleeve 11, and the impeller 4 is attached to one end, close to the shaft sleeve 11, of the cavity between the middle section 2 and the guide vane 3 and is fixedly connected with the rotating shaft 1; the middle section 2 is provided with a main liquid outlet 21 and a main liquid inlet 22; the guide vane 3 comprises a base body 31 and a return guide vane 32, the top wall of the return guide vane 32 is attached to the inner wall of one side of the base body 31, the return guide vane 32 is provided with a guide vane liquid outlet 321 and a guide vane liquid inlet 322, the guide vane liquid outlet 321 is communicated with the main liquid outlet 21, the impeller 4 is provided with an impeller liquid outlet 41 and an impeller liquid inlet 42, the impeller liquid outlet 41 is communicated with the guide vane liquid inlet 322, and the impeller liquid inlet 42 is communicated with the main liquid inlet 22; one end of the impeller 4 close to the impeller liquid inlet 42 is hermetically connected with the middle section 2 through a first sealing opening ring 23, and the outer wall of the shaft sleeve 11 is hermetically connected with the inner wall of the guide vane shaft hole 33 at the center of the guide vane 3 through a second sealing opening ring 12.

The inner wall of the impeller 4 is provided with radial guide vanes 43 in an attaching mode, the radial guide vanes 43 are arranged in a central symmetry mode about the axis of the rotating shaft 1, the inner wall 431 of one end of the radial guide vane at the impeller liquid inlet 42 and the axial direction of the rotating shaft 1 form an included angle of 10-20 degrees, the impeller liquid outlet 41 extends to the position of the maximum outer diameter of the impeller 4, the guide vane 3 does not adopt a positive guide vane structure, and the radial guide vanes 43 are added into the impeller 4, so that the axial size of the guide vanes 3 is reduced, and the space size of an overflowing part is; a cavity 5 is arranged between the impeller liquid outlet 41 and the guide vane liquid inlet 322, the cavity 5 comprises a longitudinal section 51 for preventing the impeller 4 from colliding with the middle section 2 or the guide vane 3 and a transverse section 52 for fluid transition, and the longitudinal section 51 and the transverse section 52 close to one side of the middle section 2 adopt fillet transition, so that the reduction of impact and diffusion loss is facilitated.

The return guide vane 32 is arranged in a central symmetry mode about the axis of the rotating shaft 1, the guide vane liquid inlet 322 is arranged at the position of the maximum inner diameter of the middle section 2, the inner wall 323 of the return guide vane at one end of the guide vane liquid outlet 321 and the axial direction of the rotating shaft 1 form an included angle which is 10-20 degrees, the axial size of the return guide vane 32 is reduced to be more than half of that of the existing space guide vane, the space size of an overflowing component is further saved, and the manufacturing cost is saved.

The middle section 2, the guide vane 3 and the impeller 4 are compactly arranged, the guide vane of the existing radial structure of the axial dimension of the guide vane 3 is basically consistent, the radial dimension is reduced to (1.1-1.2) D2, and the reliability of unit operation is improved.

The above detailed description has been made on the embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any equivalent replacement and equivalent transformation to the above embodiments are within the scope of the present invention.

Claims

1. The utility model provides an axial stator structure for centrifugal pump, including axis of rotation (1), middle section (2), with middle section (2) fixed connection's stator (3) and setting are in middle section (2) with impeller (4) between stator (3), its characterized in that: a main liquid outlet (21) and a main liquid inlet (22) are arranged on the middle section (2); the guide vane (3) comprises a base body (31) and a return guide vane (32), the top wall of the return guide vane (32) is attached to the inner wall of one side of the base body (31), the return guide vane (32) is provided with a guide vane liquid outlet (321) and a guide vane liquid inlet (322), and the guide vane liquid outlet (321) is communicated with the main liquid outlet (21); the impeller (4) is provided with an impeller liquid outlet (41) and an impeller liquid inlet (42), the impeller liquid outlet (41) extends to the position of the maximum outer diameter of the impeller (4) and is communicated with the guide vane liquid inlet (322), and the impeller liquid inlet (42) is communicated with the main liquid inlet (22); the impeller (4) inner wall laminating is equipped with radial stator (43), radial stator (43) about the axis central symmetry of axis of rotation (1) sets up.

2. The axial guide vane structure for a centrifugal pump according to claim 1, wherein: the middle section (2), the impeller (4) and the guide vane (3) are located on the same central line, and the rotating shaft (1) penetrates through the middle section (2), the impeller (4) and the guide vane (3).

3. The axial guide vane structure for a centrifugal pump according to claim 1, wherein: fixedly connected with axle sleeve (11) on axis of rotation (1), impeller (4) laminating sets up the one end of axle sleeve (11), fixed connection is in on axis of rotation (1).

4. The axial guide vane structure for a centrifugal pump according to claim 1, wherein: the guide vane (32) is arranged in a central symmetry mode about the axis of the rotating shaft (1), the guide vane liquid inlet (322) is arranged at the position of the maximum inner diameter of the middle section (2), an included angle is formed between the inner wall (323) of the guide vane at one end of the guide vane liquid outlet (321) and the axial direction of the rotating shaft (1), and the included angle is 10-20 degrees.

5. The axial guide vane structure for a centrifugal pump according to claim 1, wherein: impeller liquid outlet (41) with be equipped with cavity (5) between stator inlet (322), cavity (5) are including preventing impeller (4) with middle section (2) or vertical section (51) that stator (3) collided and horizontal section (52) that are used for the fluid transition are close to middle section (2) one side vertical section (51) with horizontal section (52) adopt the fillet transition.

6. The axial guide vane structure for a centrifugal pump according to claim 1, wherein: the radial guide vane inner wall (431) at one end, close to the impeller liquid inlet (42), of the radial guide vane (43) and the axial direction of the rotating shaft (1) form an included angle which is 10-20 degrees.

7. The axial guide vane structure for a centrifugal pump according to claim 3, wherein: impeller (4) are close to impeller inlet (42) one end through first sealed choma (23) with middle section (2) sealing connection, axle sleeve (11) outer wall with stator shaft hole (33) inner wall that the center of stator (3) put passes through second sealed choma (12) sealing connection.