CN113250965A - Novel axial water collection pump body structure - Google Patents

Abstract

The invention discloses a novel axial water collection pump body structure, which comprises a pump body, a pump shaft and a multi-stage impeller structure, wherein the pump body comprises an extrusion section of an outlet, a plurality of middle sections are arranged on two sides of the pump body, the impeller structure is arranged in the pump body and the middle sections, and the multi-stage impeller structure, the middle sections and the pump body are sequentially sleeved on the pump shaft in a penetrating manner; the structure arranged in the middle section comprises an impeller, a guide vane and an O-shaped sealing ring, the impeller is fixed on the pump shaft through a flat key, and the guide vane is arranged on the rear side of the impeller; the structure arranged in the pump body comprises a final-stage impeller and an O-shaped sealing ring; and an O-shaped sealing ring is arranged between every two adjacent middle sections and between the last-stage middle section and the pump body. The invention solves the problems of heavy overall mass and large size of the multistage centrifugal pump in the prior art.

Description

Novel axial water collection pump body structure

Technical Field

The invention relates to a novel axial water collection pump body structure, and belongs to the technical field of centrifugal pumps.

Background

The multistage centrifugal pump body is used for collecting the medium that the impeller came out, and the relative position of last stage impeller is mostly radial cooperation, anterior secondary impeller and the radial cooperation of stator simultaneously, accomplish the diversion of medium in positive stator structure, can increase barrel and pump body radial dimension like this, simultaneously for guaranteeing the even running of the multistage centrifugal pump equipment of working at high temperature high pressure environment, need further increase pressure-bearing casing wall thickness to satisfy compressive stress and thermal stress requirement, thereby make multistage centrifugal pump heavier, increase the waste of material and financial resources.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a novel axial water collection pump body structure, and solves the problems of heavy overall mass and large size of a multistage centrifugal pump in the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions:

a novel axial water collection pump body structure comprises a pump body, a pump shaft and a multi-stage impeller structure, wherein the pump body comprises an extrusion section, a plurality of middle sections are arranged on two sides of the pump body, the impeller structure is arranged in the pump body and the middle sections, and the multi-stage impeller structure, the middle sections and the pump body are sequentially sleeved on the pump shaft in a penetrating manner; the structure arranged in the middle section comprises an impeller, a guide vane and an O-shaped sealing ring, the impeller is fixed on the pump shaft through a flat key, and the guide vane is arranged on the rear side of the impeller; the structure arranged in the pump body comprises a final-stage impeller and an O-shaped sealing ring; and an O-shaped sealing ring is arranged between every two adjacent middle sections and between the last-stage middle section and the pump body.

Preferably, the impeller comprises a front cover plate, a rear cover plate and a plurality of blades distributed between the front cover plate and the rear cover plate, the inner side surface of the front cover plate is fixedly connected with the blades, the inner side surface of the rear cover plate is fixedly connected with the blades, a flow channel is formed between two adjacent blades, a hub is arranged in the middle of the impeller, a shaft hole matched with the pump shaft is formed in the hub, a water suction port communicated with the flow channel is arranged between the front cover plate and the hub, an impeller water outlet communicated with the flow channel is arranged between the front cover plate and the rear cover plate, the end part of each blade at the position of the impeller water outlet is obliquely cut, and a round angle extends out of the outer end part of the front cover plate along the direction of the rear cover plate.

Preferably, the water outlet of the last-stage impeller is directly axially matched with the pump body.

Preferably, the pump body is connected with the pump shaft through a shaft sleeve.

Preferably, the outer end of the shaft sleeve is provided with a sliding bearing, and the sliding bearing is fixedly connected with the pump body through a screw.

Preferably, the pump body comprises a spiral water collecting section, the structure of the spiral water collecting section is a retracted spiral structure, the size of the outer edge of the pump body with the spiral structure is fixed, the size of the outer edge is a base circle and is retracted inwards, and the cross section of the flow channel is spirally increased along with the flowing direction.

A centrifugal pump comprises the novel axial water collection pump body structure.

The invention achieves the following beneficial effects:

1. the impeller structure in the middle section is internally provided with a positive guide vane, the outlet of the impeller is changed, the medium flows into the lower-level middle section through the drainage of the rear guide vane, the reversing of the positive guide vane is not needed, the outlet of the impeller and the structure of the water receiving section of the pump body are changed, the medium is axially discharged from the water outlet, the relative position of the pump body and the impeller is changed from the radial direction to the axial direction, the overall radial dimension is reduced, meanwhile, the wall thickness of the shell such as the cylinder body and the pump body can also be reduced, and the purpose of reducing the overall quality of the pump can be achieved.

2. And guide vane-free drainage is arranged between the final-stage impeller and the extrusion section, so that the volume of the pump body is further reduced.

3. The pump body adopts the novel structure of the spiral type that the edge size is the base circle, and the inward contraction has guaranteed that pump body runner cross sectional area scales up along with flowing on reducing radial dimension basis, and the velocity of flow is evenly equal, has improved and has received water efficiency.

Drawings

FIG. 1 is a schematic view of a prior art final stage impeller in cooperation with a pump body;

FIG. 2 is an assembly view of the overall structure of the present invention;

FIG. 3 is a cross-sectional view of the impeller of the present invention;

FIG. 4 is a view of the internal structure of the water receiving section of the pump body according to the present invention;

FIG. 5 is a schematic view of the internal contracting spiral water collecting section of the present invention;

FIG. 6 is a schematic diagram of a water collecting section of a volute casing pump body in the prior art.

The meaning of the reference symbols in the figures: 1-a flat bond; 2-a pump shaft; 3-first stage impeller; 4-O type sealing ring; 5-first stage guide vanes; 6-a secondary impeller; 7-secondary vanes; 8-a pump body; 9-middle section; 10-a plain bearing; 11-a screw; 12-final stage impeller; 13-shaft sleeve; 14-an extrusion section; 15-a spiral water receiving section; 16-a front cover plate; 17-a water suction port; 18-axle hole; 19-a rear cover plate; 20-a hub; 21-leaf blade; 22-impeller water outlet.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The embodiment discloses a novel axial water collection pump body structure, as shown in fig. 2, which comprises a pump body 8, a pump shaft 2 and a multi-stage impeller structure, wherein the pump body 8 comprises an extrusion section 14, a plurality of middle sections 9 are arranged on two sides of the extrusion section, the impeller structure is arranged in the pump body 8 and the middle sections 9, and the multi-stage impeller structure, the middle sections and the pump body 8 are respectively sleeved on the pump shaft 2 in a penetrating manner; the structure arranged in the middle section 9 comprises an impeller, a guide vane and an O-shaped sealing ring 4, the impeller is fixed on the pump shaft 2 through a flat key 1, and the guide vane is arranged on the rear side of the impeller; the structure arranged in the pump body 8 comprises a final-stage impeller 12 and an O-shaped sealing ring 4, and the impeller is also fixed on the pump shaft 2 through a flat key 1; the O-shaped sealing rings are arranged between two adjacent middle sections 9 and between the last-stage middle section and the pump body 8. Referring to fig. 2, in the specific embodiment, two midsections are included, in the first midsection a first impeller 3 and a first guide vane 5 are provided, and in the second midsection a second impeller 6 and a second guide vane 7 are provided. The primary impeller 3 and the secondary impeller 6 are not radially matched with the positive guide vane structure in the guide vane, but axially and directly enter the rear part of the guide vane, and the guide vane has no positive guide vane structure.

As shown in FIG. 3, each stage of impeller comprises a front cover plate 16, a rear cover plate 19 and a plurality of blades 21 distributed between the front cover plate 16 and the rear cover plate 19, the inner side surface of the front cover plate 16 is fixedly connected with the blades 21, the inner side surface 21 of the rear cover plate 19 is fixedly connected with the blades, a flow channel is formed between two adjacent blades 21, a hub 20 is arranged in the middle of the impeller, a shaft hole 18 matched with the pump shaft 2 is arranged on the hub 20, a water suction port 17 communicated with the flow channel is arranged between the front cover plate 16 and the hub 20, an impeller water outlet 22 communicated with the flow channel is arranged between the front cover plate 16 and the rear cover plate 19, the end part of each blade at the position of the impeller water outlet 22 is obliquely cut, a round angle extends from the outer side end part of the front cover plate 16 along the direction of the rear cover plate 19, so that the water flow at the round angle can be reversed, further reducing the volume of the pump body.

The pump body 8 is internally provided with a cavity, a shaft sleeve 13 is arranged in the cavity and is connected with the pump shaft 2 through the shaft sleeve 13, the outer end of the shaft sleeve 13 is coaxially provided with a sliding bearing 10, and the sliding bearing 10 is fixedly connected with the pump body 8 through a screw 11. The matching of the final-stage impeller and the pump body of the common centrifugal pump is shown in figure 1, the width center line of the water outlet of the final-stage impeller is aligned with the center line of the pump body and is in radial matching, and fluid flows out along the radial direction of the final-stage impeller and flows into a pipeline of a water pumping section of the water pump through a flow channel of a volute pump shell. Referring to fig. 2, in the present embodiment, the width center line of the impeller outlet 22 of the final-stage impeller 12 is not aligned with the center line of the extruding section 14, and the medium flowing-out direction of the impeller outlet 22 is axially matched with the medium flowing-in direction of the extruding section 14 of the pump body 8. The water outlet and the pump body water collecting section structure of the impeller are changed, fluid can be discharged along the axial direction of the impeller, the relative position of the pump body and the impeller is changed from the radial direction to the axial direction, the overall radial size is reduced, the wall thickness of the shell such as the cylinder body and the pump body can be reduced, and the purpose of reducing the overall quality of the pump can be achieved.

Referring to fig. 4 and 5, the pump casing of the water collecting section adopts an internal spiral volute, and a spiral water collecting section 15 is arranged in the pump casing. Fig. 6 is a structure of a water collecting section of a common volute casing, and the radial size of the water collecting section is gradually increased based on a water collecting flow channel with a base circle outwards. In this embodiment, the spiral water collecting section 15 has a spiral structure with an outer edge size as a base circle and an inward contraction, and the sectional area of the flow channel is gradually enlarged along the inward flow, so that the flow velocity is kept substantially unchanged after high-speed liquid thrown from the periphery of the impeller is collected. On the basis of reducing the radial dimension, the flow velocity of a pump body flow channel is ensured to be uniform and equal, the water flow impact loss is reduced, and the water collection efficiency is improved.

In actual use, liquid enters from the inlet, passes through the first-stage impeller, is reversed at the fillet structure of the front cover plate after being subjected to radial centrifugal rotation work of the blades, continuously flows backwards along the guide vanes, enters the next-stage impeller along the axial direction, and is analogized by the way until entering the last-stage impeller and flowing out, enters the pump body from the axial direction and is discharged from the extrusion section after completing water collection, the cross section area of the flow passage of the pump body is spirally increased, and the water collection efficiency is ensured.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. The novel axial water collection pump body structure is characterized by comprising a pump body (8), a pump shaft (2) and a multi-stage impeller structure, wherein the pump body (8) comprises an extrusion section (14), a plurality of middle sections (9) are arranged on two sides of the pump body, the impeller structure is arranged in the pump body (8) and the middle sections (9), and the multi-stage impeller structure, the middle sections (9) and the pump body (8) are sequentially sleeved on the pump shaft (2) in a penetrating manner; the structure arranged in the middle section (9) comprises an impeller, a guide vane and an O-shaped sealing ring (4), the impeller is fixed on the pump shaft (2) through a flat key (1), and the guide vane is arranged on the rear side of the impeller; the structure arranged in the pump body (8) comprises a final-stage impeller (12) and an O-shaped sealing ring (4); and an O-shaped sealing ring (4) is arranged between the two adjacent middle sections (9) and between the last-stage middle section (9) and the pump body (8).

2. The novel axial water collection pump body structure as claimed in claim 1, the impeller comprises a front cover plate (16), a rear cover plate (19) and a plurality of blades (21) distributed between the front cover plate (16) and the rear cover plate (19), the inner side surface of the front cover plate (16) is fixedly connected with the blades (21), the inner side surface of the rear cover plate (19) is fixedly connected with the blades (21), a flow channel is formed between two adjacent blades (21), a hub (20) is arranged in the middle of the impeller, a shaft hole (18) matched with the pump shaft (2) is arranged on the hub (20), a water suction port (17) communicated with the flow passage is arranged between the front cover plate (16) and the hub (20), an impeller water outlet (22) communicated with the flow channel is arranged between the front cover plate (16) and the rear cover plate (19), the end part of the blade at the position of the impeller water outlet (22) is chamfered, a round angle extends from the outer side end of the front cover plate (16) along the direction of the rear cover plate (19).

3. A new axial water-collecting pump body structure according to claim 2, characterized in that the water outlet (22) of the last-stage impeller (12) is directly axially fitted with the pump body (8).

4. The novel axial water collection pump body structure according to claim 1, characterized in that the pump body (8) is connected with the pump shaft (2) through a shaft sleeve (13).

5. The novel axial water collection pump body structure is characterized in that a sliding bearing (10) is arranged at the outer end of the shaft sleeve (13), and the sliding bearing (10) is fixedly connected with the pump body (8) through a screw (11).

6. The novel axial water collecting pump body structure according to claim 1, characterized in that the pump body (8) comprises a spiral water collecting section (15), the spiral water collecting section (15) is of a retracted spiral structure, the outer edge of the spiral pump body (8) is fixed in size, the outer edge is a base circle and shrinks inwards, and the flow passage section increases spirally along the flow direction.

7. A centrifugal pump comprising a novel axial water collection pump body structure as claimed in any one of claims 1 to 6.

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