CN217682466U

CN217682466U - Bidirectional volute for low-pressure water-coal-slurry pump

Info

Publication number: CN217682466U
Application number: CN202221471769.8U
Authority: CN
Inventors: 王姣; 李文周; 李燕
Original assignee: Shanghai First Pump Works Co ltd
Current assignee: Shanghai First Pump Works Co ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-10-28
Anticipated expiration: 2032-06-14

Abstract

The utility model relates to a low pressure coal slurry pump field discloses a two-way spiral case for low pressure coal slurry pump, including the spiral case main part, the spiral case main part divide into two and divides the spiral case, and two divide the spiral case to have respective snail body part and diffusion tube part, the minimum department of radial dimension who divides the spiral case is equipped with the partition tongue, for the starting point of the snail body part of dividing the spiral case, separates snail body part and another diffusion tube part that divides the spiral case simultaneously. The utility model discloses make low pressure water coal slurry pump when the non-operating mode point moves, the radial force that the spiral case produced the impeller is eliminated, has improved the stationarity of low pressure water coal slurry pump operation.

Description

Bidirectional volute for low-pressure water-coal-slurry pump

Technical Field

The utility model relates to a low pressure coal slurry pump field especially relates to a two-way spiral case for low pressure coal slurry pump.

Background

The low-pressure water coal slurry pump is one of the important coal slurry conveying devices in the coal slurry gasification process, and the normal operation of the gasification device is directly influenced by the operation, performance and service life of the coal slurry due to the special properties of the coal slurry. The common volute forms of the existing water-coal-slurry pump are mostly single volute and double volute. The single volute has the advantages of simple structure and easy casting processing, and the disadvantage of the single volute is that when the pump runs at a deviation from a design working point, additional radial force on an impeller acting in the volute can be generated, and the running stability and the service life of the pump can be influenced. The double volute is a double-layer runner, so that casting is difficult, sand cleaning of an outer side runner is difficult, the outer side runner is blocked, and the performance of the pump is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems and providing a bidirectional volute for a low-pressure water-coal-slurry pump, which has the characteristics that the bidirectional volute is completely symmetrical and can automatically balance the radial force generated when the pump operates at a non-operating point, thereby being beneficial to the safe and stable operation of the pump; the bidirectional volute casing is easy to cast, the flow channel is easy to clean and polish, the surface quality of the flow channel can be improved, the loss can be reduced, and the efficiency of the water-coal-slurry pump is improved.

The utility model adopts the technical proposal that:

a bidirectional volute for a low-pressure water-coal-slurry pump is characterized by comprising a volute main body, wherein the volute main body is divided into two sub volutes, each of the two sub volutes is provided with a volute body part and a diffusion pipe part, a partition tongue is arranged at the position with the minimum radial dimension of each sub volute and is the starting point of the volute body part of each sub volute, and the volute body part is separated from the diffusion pipe part of the other sub volute.

Furthermore, the volute body part, the diffuser pipe part and the partition tongue of the two sub-volutes are centrosymmetric relative to the center of a base circle of the volute main body.

Furthermore, the center lines of the volute parts of the two sub-volutes and the diffuser part are superposed, and the volute parts of the two sub-volutes and the diffuser part are axially symmetrical along the center line of the volute.

Further, the wrap angle e =180 ° of the volute body portion of the partial volute.

Further, the cross section of the inner wall of the volute body part of the sub-volute is rectangular.

The beneficial effects of the utility model are that:

(1) The bidirectional volute can automatically balance the radial force generated when the bidirectional volute operates at a non-working point, so that the pump can stably operate;

(2) The bidirectional volute is simple in structure and easy to cast, and cannot be stuck with sand to block a flow channel to influence the performance of the pump; meanwhile, the flow channel is easy to clean and polish, the surface quality of the flow channel can be improved, the loss can be reduced, and the efficiency of the water-coal-slurry pump is improved;

(3) The volute body parts, the diffusion pipe parts and the partition tongues of the two sub-volutes of the bidirectional volute are centrosymmetric relative to the center of a base circle of the volute body and are axially symmetric along a central line, and axial front and back surfaces do not need to be considered, so that the bidirectional volute is convenient and quick to install.

Drawings

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

fig. 2 is a schematic longitudinal sectional view of the present invention.

Reference numerals:

1. a bi-directional volute body;

2. a volute portion of the sub-volute;

3. a diffuser pipe portion of the sub-volute;

4. and (4) separating the tongue.

Detailed Description

The following describes the specific embodiment of the bidirectional volute for a water-coal-slurry pump in detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the bidirectional volute for the low-pressure water-coal-slurry pump comprises a volute main body 1, and an impeller is arranged inside the volute main body 1. The volute comprises a volute body 1, wherein the volute body is divided into two sub volutes, each sub volute is provided with a volute body part 2 and a diffusion pipe part 3, a partition tongue 4 is arranged at the position with the minimum radial size of each sub volute and is the starting point of the volute body part 2 of each sub volute, and the volute body part 2 is separated from the diffusion pipe part 3 of the other sub volute. The volute body part 2, the diffuser part 3 and the partition tongue 4 of the two sub-volutes are centrosymmetric relative to the center of a base circle of the volute body 1. The center lines of the volute body parts 2 and the diffuser pipe parts 3 of the two sub-volutes are superposed, and the volute body parts 2 and the diffuser pipe parts 3 of the two sub-volutes are axially symmetrical along the center line of the volute body part 2. The wrap angle e =180 ° of the volute body part 2 of the partial volute. The inner wall section of the volute body part 2 of the sub-volute is rectangular.

An impeller is arranged on the inner side of the bidirectional volute, a channel is formed between the impeller and the volute body parts 2 of the sub-volute on two sides, and the impeller and the volute body parts rotate to the diffuser pipe part 3 from the position of the partition tongue 4 to the position of the other partition tongue 4 along the rectangular inner wall surface of the volute body part 2. The pipe orifice of the diffusion pipe part 3 is in a horn shape, the baffle 4 is positioned at the bottom of the diffusion pipe part 3, and the coal water slurry is separated by the baffle 4 and then is sent into the diffusion pipe part 3.

Referring to the attached figure 2, when the water-coal-slurry pump works, the impeller rotates in the volute to drive the water-coal-slurry to be introduced from the inlet at the lower side, the water-coal-slurry does work through the impeller, the water-coal-slurry enters the sub-volute of the bidirectional volute, is collected through the volute body part 2 of the sub-volute and flows towards the direction of the expansion pipe part, the water-coal-slurry is output from the diffusion pipe parts 3 of the two sub-volutes due to the obstruction of the partition tongues 4, and the water-coal-slurry passes through the diffusion pipe parts to reduce the flow rate, so that part of kinetic energy is converted into pressure energy. Because the two sub-volutes of the bidirectional volute 1 are respectively provided with the volute body part 2 and the diffusion pipe part 3 which are symmetrical relative to the center of the base circle of the volute body 1, the stress on the two sides of all the impellers is mutually offset, and the service life of the low-pressure water coal slurry pump is prolonged.

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

Claims

1. The utility model provides a two-way spiral case for low pressure coal slurry pump which characterized in that: the volute comprises a volute main body, wherein the volute main body is divided into two sub volutes, each sub volute is provided with a volute body part and a diffusion pipe part, the minimum radial size position of each sub volute is provided with a separation tongue which is the starting point of the volute body part of each sub volute and separates the volute body part from the diffusion pipe part of the other sub volute.

2. The bidirectional volute of claim 1, wherein: the volute body parts, the diffuser pipe parts and the partition tongues of the two sub-volutes are centrosymmetric relative to the center of a base circle of the volute main body.

3. The bidirectional volute of claim 1, wherein: the center lines of the volute parts of the two sub-volutes and the diffuser part are superposed, and the volute parts of the two sub-volutes and the diffuser part are symmetrical along the center line of the volute.

4. The bidirectional volute for the low-pressure water-coal-slurry pump according to any one of claims 1 to 3, wherein: the wrap angle epsilon of the volute body part of the sub volute is =180 degrees.

5. The bidirectional volute for the low-pressure water-coal-slurry pump according to any one of claims 1 to 3, wherein: the inner wall section of the volute body part of the sub-volute is rectangular.