CN219672859U

CN219672859U - Built-in runner structure and fire pump

Info

Publication number: CN219672859U
Application number: CN202320919224.7U
Authority: CN
Inventors: 李攀强
Original assignee: Aoding Shanghai Fire Equipment Co ltd
Current assignee: Aoding Shanghai Fire Equipment Co ltd
Priority date: 2023-01-19
Filing date: 2023-04-21
Publication date: 2023-09-12
Anticipated expiration: 2033-04-21

Abstract

The built-in runner structure and the fire pump, the runner is arranged in the pump body, the inlet of the runner is aligned with the water outlet of the first-stage impeller, and the outlet of the runner is aligned with the water inlet of the second-stage impeller. A water flow passage is formed in the pump body through the built-in flow passage, high-pressure liquid is conveyed to the secondary impeller from the primary impeller, an external pipeline is replaced, the water flow stroke is reduced, the water pump along-stroke loss is reduced, and the water pump efficiency is improved.

Description

Built-in runner structure and fire pump

Technical Field

The utility model relates to the field of fire-fighting water pumps, in particular to a built-in flow passage structure suitable for a self-balancing multistage (secondary) centrifugal pump and a fire-fighting pump.

Background

At present, the segmental self-balancing multistage centrifugal pump sucks liquid from a first-stage impeller, the liquid is required to be conveyed to a lower-stage impeller through a runner and then discharged outwards, the runner of the pump body is communicated with an external pipeline through a pump body flange, the position of the runner is outside the body, the volume of equipment is increased, and the overall dimension is large and is not attractive. The above problems are particularly pronounced for mobile pumps (e.g., fire pumps) that require external dimensions, and need to be addressed.

Disclosure of Invention

The utility model aims to solve the existing problems and aims to provide a built-in flow passage structure and a fire pump.

In order to achieve the above purpose, the utility model adopts the technical scheme that the utility model provides a built-in flow channel structure, a first-stage impeller and a secondary impeller are arranged in a pump body, liquid enters from a water inlet of the first-stage impeller and is conveyed to a water inlet of the secondary impeller through a flow channel, the flow channel is arranged in the pump body, an inlet of the flow channel is aligned with a water outlet of the first-stage impeller, and an outlet of the flow channel is aligned with the water inlet of the secondary impeller.

The pump body is formed by sequentially connecting a front pump cover, a first-stage pump body, a secondary pump body and a rear pump cover; a first-stage cavity for accommodating the first-stage impeller is arranged in the first-stage pump body, the front end and the rear end of the first-stage cavity are communicated, and the front end of the first-stage cavity is connected with a water inlet of a front pump cover; a secondary cavity for accommodating a secondary impeller is arranged in the secondary pump body, the front end surface of the secondary pump body is a baffle plate, and the rear end surface is an inner cavity for opening and connecting a rear pump cover; the runner is arranged in the side wall of the pump body; the inlet of the runner is communicated with the first-stage cavity, the middle section penetrates through the secondary pump body, and the outlet penetrates through the rear pump cover and is communicated with the inner cavity of the rear pump cover.

And sealing rings are arranged at the opening splicing parts of the flow channels on the front end face and the rear end face of the first-stage pump body, the second-stage pump body and the rear pump cover.

Wherein, first-stage impeller passes through the wearing ring and seals with the front end of preceding pump cover cavity.

The rear end of the secondary impeller is sealed with the rear end face of the rear pump cover cavity through another abrasion ring.

The shaft is rotatably sealed with the partition plate through the sealing gasket ring and the impeller hub.

The utility model also provides a fire pump which comprises any built-in flow passage structure.

Compared with the prior art, the utility model forms a water flow passage in the pump body through the built-in flow passage, and high-pressure liquid is conveyed from the first-stage impeller to the secondary impeller, thereby replacing an external pipeline, reducing the water flow stroke, reducing the water pump along-stroke loss and improving the water pump efficiency; the structural space of the pump body, the bracket and the like is fully utilized, so that the external dimension is greatly reduced, the appearance is attractive, and the movement is convenient in a narrow area.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is an exploded view of an embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of the front pump cover;

FIG. 4 is a schematic view of the structure of the first stage pump body;

FIG. 5 is a schematic view of the structure of the secondary pump body;

FIG. 6 is a schematic structural view of the rear pump cap;

FIG. 7 is a schematic view of the structure of the first stage impeller;

referring to the drawings, a front pump cover, a first-stage pump body 2, a secondary pump body 3, a rear pump cover 4, a pump body flow channel 5, a shaft 6, a first-stage impeller 7, a secondary impeller 8, a sealing ring 9, a partition plate 10 and a total water inlet 11.

Detailed Description

The utility model will now be further described with reference to the accompanying drawings. Referring to fig. 1 to 7, fig. 1 to 7 show an embodiment of the present utility model (a secondary fire pump), in which a pump body is formed by connecting a front pump cover, a primary pump body, a secondary pump body and a rear pump cover in this order from front to rear; the fixed connection is preferably accomplished by bolts that pass through the four components in sequence. For ease of description, the embodiment uses the general water inlet direction as the "front".

Referring to fig. 1 and 3, the front and rear end surfaces of the front pump cover are communicated, the middle part of the front end surface is provided with a total water inlet, and the through opening of the rear end surface is communicated with the first-stage pump body. Referring to fig. 1 and 4, a first-stage cavity for accommodating a first-stage impeller is arranged in the first-stage pump body, the front end and the rear end of the first-stage cavity are communicated, the front end of the first-stage cavity is communicated with a front pump cover and a main water inlet, and the rear end of the first-stage cavity is provided with a baffle seat.

Referring to fig. 1 and 5, a secondary cavity for accommodating a secondary impeller is arranged in the secondary pump body, the front end surface of the secondary pump body is provided with a baffle plate, a hole for a shaft to pass through is formed in the baffle plate, and the baffle plate can be inserted forward and fixed on a baffle plate seat; the rear end face is opened and communicated with the inner cavity of the rear pump cover.

Referring to fig. 1 and 6, the front end of the rear pump cover is connected to the secondary cavity, the rear end is provided with a shaft hole and a mechanical seal, and the shaft passes through the shaft hole and forms a rotary connection through the mechanical seal.

Referring to fig. 1, a primary impeller and a secondary impeller are coaxially connected through a shaft, specifically, the front end of the shaft is connected with the axle center of the rear end face of the primary impeller through a key, and the middle section shaft body of the shaft passes through a middle hole of the secondary impeller and is fixedly connected with the middle hole through another key; the shaft can drive the primary impeller and the secondary impeller to synchronously rotate under the drive of external power. A partition plate for dividing two cavity spaces is arranged between the primary impeller and the secondary impeller, and a front section rod body of the shaft penetrates through a hole of the partition plate and is sealed with the partition plate through a sealing ring and/or an impeller hub.

The present embodiment is based on the above-described mechanism, in particular provided with a flow channel for delivering liquid inside the pump body. Referring to fig. 2, the flow channel is arranged in the side wall below the pump body, so that the space in the bracket structure can be fully utilized. The inlet of the runner is aligned with the water outlet of the first-stage impeller along the radial direction and is suitable for radial water outlet. The middle section of the flow channel penetrates through the front end and the rear end of the side wall below the secondary body, the outlet of the flow channel extends upwards, and the flow channel enters the inner cavity of the rear pump cover and then is aligned with the water inlet of the secondary impeller; forming a U-shaped liquid passage with an upward opening. After entering the secondary impeller, the water is pressurized by the secondary impeller, and the high-pressure water is discharged.

Preferably, the flow channel is formed with flow channel openings on the rear end face of the first-stage pump body, the front and rear end faces of the secondary pump body and the front end face of the rear pump cover respectively, and after the two corresponding flow channel openings in each group are mutually spliced, a complete flow channel is formed. And in order to ensure water tightness, sealing rings are arranged at the spliced positions of the openings of the flow channels.

Further, referring to fig. 7, the water inlet of the first stage impeller is located at the axial center of the front end surface thereof; the inside of the first-stage impeller is provided with a cavity, first-stage blades are circumferentially arranged in the cavity, and a plurality of water outlets of the first-stage impeller are circumferentially and uniformly arranged at the thickness of the edge of the impeller body; the rear end face of the first-stage impeller is connected with the front end of the shaft and is airtight. The high-pressure liquid entering from the water inlet of the first-stage impeller is pushed by the first-stage blades in the inner cavity of the first-stage impeller, is conveyed to the water outlet at the edge of the impeller body, is radially output to the inlet of the runner under the centrifugal action, and enters the runner.

Referring to fig. 1, the secondary impeller is similar in structure to the primary impeller, but is oriented axially in the opposite direction. The water inlet of the secondary impeller is positioned at the axis of the rear end face of the secondary impeller, and the outer ring of the rear end face of the secondary impeller and the outer wall of the shaft form a circular secondary impeller water inlet. The outlet of the runner conveys liquid to the water inlet of the secondary impeller, and the entered liquid is pushed by the secondary blades in the internal cavity of the secondary impeller, conveyed to the water outlet at the edge of the impeller body and radially discharged.

In addition, other splice parts of the front pump cover, the first-stage pump body, the secondary pump body and the rear pump cover are also respectively provided with a sealing component for ensuring water tightness. Further, the first-stage impeller is sealed with the front pump cover cavity through the abrasion ring, and the second-stage impeller is sealed with the rear pump cover cavity through the other abrasion ring, so that water sealing of the pump body can be further ensured.

The embodiments of the present utility model have been described above with reference to the accompanying drawings and examples, which are not to be construed as limiting the utility model, and those skilled in the art may make modifications as required, all of which are within the scope of the appended claims.

Claims

1. The utility model provides a built-in runner structure of multistage centrifugal pump, the inside first-stage impeller and the secondary impeller of including of pump body, liquid gets into from the water inlet of first-stage impeller, carries to the water inlet of secondary impeller, its characterized in that through the runner: the runner is arranged in the pump body, the inlet of the runner is aligned with the water outlet of the primary impeller, and the outlet of the runner is aligned with the water inlet of the secondary impeller.

2. The built-in flow passage structure according to claim 1, wherein: the primary impeller and the secondary impeller are coaxially arranged through a shaft, the front end part of the shaft is connected with a shaft hole on the rear end surface of the primary impeller, and the middle shaft body of the shaft is connected with a middle hole of the secondary impeller; a partition plate for dividing the space is arranged between the primary impeller and the secondary impeller, and the shaft body of the shaft penetrates through the partition plate and is sealed with the partition plate.

3. The built-in flow channel structure according to claim 2, wherein: the water inlet of the first-stage impeller is positioned at the axle center of the front end surface of the first-stage impeller, and the entering liquid is conveyed to the water outlet at the edge of the impeller body by the first-stage blades in the inner cavity of the first-stage impeller and is radially output to the inlet of the pump body runner.

4. The built-in flow channel structure according to claim 2, wherein: the water inlet of the secondary impeller is positioned at the axis of the rear end face of the secondary impeller, the outlet of the flow channel conveys liquid to the water inlet of the secondary impeller, and the entered liquid is conveyed to the water outlet at the edge of the wheel body of the secondary impeller through the secondary blades in the inner cavity of the secondary impeller and is radially discharged.

5. The built-in flow passage structure according to any one of claims 2 to 4, characterized in that: the pump body is formed by sequentially connecting a front pump cover, a first-stage pump body, a secondary pump body and a rear pump cover; a first-stage cavity for accommodating a first-stage impeller is arranged in the first-stage pump body; a secondary cavity for accommodating a secondary impeller is arranged in the secondary pump body, the front end surface of the secondary pump body is a baffle plate, and the rear end surface is communicated with an inner cavity of the rear pump cover; the runner is arranged in the side wall of the pump body; the inlet of the runner is communicated with the first-stage cavity, the middle section penetrates through the secondary pump body, and the outlet penetrates through the rear pump cover and is communicated with the inner cavity of the rear pump cover.

6. The built-in flow passage structure according to claim 5, wherein: the runner is arranged in the side wall of the body.

7. The built-in flow passage structure according to claim 5 or 6, characterized in that: the flow channel is provided with sealing rings at the joints of openings on the front and rear end surfaces of the first-stage pump body, the secondary pump body and the rear pump cover.

8. The built-in flow passage structure according to claim 5, wherein: the first-stage impeller is sealed with the front end of the front pump cover cavity through a wear ring; and/or the inlet end of the secondary impeller is sealed with the rear end surface of the rear pump cover cavity through another abrasion ring, and/or the shaft is rotatably sealed with the partition plate through a sealing ring and an impeller hub.

9. Fire pump, its characterized in that: comprising the built-in flow channel structure according to any one of claims 1-8.