CN219220816U

CN219220816U - Multi-stage delivery pump for easily crystallized medium

Info

Publication number: CN219220816U
Application number: CN202222539785.2U
Authority: CN
Inventors: 江海浩; 陈超; 王开; 江伟达
Original assignee: Leo Group Zhejiang Pump Co Ltd
Current assignee: Leo Group Zhejiang Pump Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-06-20
Anticipated expiration: 2032-09-21

Abstract

The utility model discloses an easily crystallized medium multistage conveying pump which comprises a pump cover, a pump shaft and a pump cylinder, wherein a pump cavity is arranged in the pump cylinder, a flushing fluid cavity is further arranged between the pump cover and the pump cavity, a first mechanical sealing piece sleeved on the pump shaft is arranged between the flushing fluid cavity and the pump cavity, and a second mechanical sealing piece is arranged at the connecting part of the pump cover and the pump shaft. The utility model can prevent the crystallization substance particles from causing the roughness of the contact surface between the dynamic ring and the static ring, ensure the sealing surface between the dynamic ring and the static ring of the mechanical seal to be always wet and smooth, keep low friction and low loss and ensure the sealing effect of the mechanical seal.

Description

Multi-stage delivery pump for easily crystallized medium

Technical Field

The present utility model relates to a fluid pump, and more particularly, to an easily crystallized medium multistage delivery pump.

Background

The medium conveying pump is one widely used industrial device for conveying fluid working medium for production, and has multistage impellers inside the pump cavity to pressurize the medium in multistage to reach high lift. Because of high lift, the mechanical seal in the pump cavity adopts the container type mechanical seal which can bear high pressure to ensure the sealing effect, and the cooling and lubrication of the mechanical seal ring are ensured between the dynamic ring and the static ring of the mechanical seal through the conveyed medium. If the medium to be conveyed is an easy-crystallization medium, the crystallization substance particles cause rough contact surface between the dynamic ring and the static ring, and friction loss is increased, so that the sealing surface between the dynamic ring and the static ring of the mechanical seal is damaged, the sealing effect of the mechanical seal is lost, and the medium conveying pump leaks. The utility model patent with publication number of CN2079671 discloses a viscosity medium delivery pump which consists of a pump body, a rotor, rollers, a sealing side plate and a main shaft, but the utility model is not applicable to a medium easy to crystallize and cannot solve the technical problem that a sealing surface between a dynamic ring and a static ring of a mechanical seal is damaged by a crystallization substance to cause sealing failure.

Disclosure of Invention

The utility model provides a medium conveying pump for conveying an easily crystallized medium, which can cause sealing failure due to the fact that a sealing surface between a dynamic ring and a static ring of a mechanical seal is damaged by a crystallized substance.

The technical scheme of the utility model is as follows: the utility model provides an easy crystallization medium multistage delivery pump, includes pump cover, pump shaft and pump barrel, is equipped with the pump chamber in the pump barrel, still is equipped with the flushing fluid chamber between pump cover and pump chamber, is equipped with the first mechanical seal piece of cup jointing on the pump shaft between flushing fluid chamber and the pump chamber, and pump cover and pump shaft connecting portion are equipped with the second mechanical seal piece. The two mechanical sealing elements are coaxially arranged and are respectively used for dynamic sealing of the pump cavity and the flushing fluid cavity. The flushing liquid cavity is filled with flushing liquid, the pressure of the flushing liquid is smaller than the pressure of medium liquid in the pump cavity, and the flushing liquid cannot enter the pump cavity to pollute the medium. On the other hand, because the flushing fluid exists, the first mechanical sealing element is positioned in the flushing fluid, so that the liquid film between the friction pairs of the first mechanical sealing element is prevented from evaporating, and the generation of crystals is prevented to a great extent. The flushing liquid will lubricate and cool the first mechanical seal even during dry running or vacuum conditions of the pump chamber. Therefore, the utility model can prevent the crystallization substance particles from causing the roughness of the contact surface between the dynamic ring and the static ring, ensure the constant wetting and smoothness of the sealing surface between the dynamic ring and the static ring of the mechanical seal, keep low friction and low loss and ensure the sealing effect of the mechanical seal.

Preferably, the pump cylinder is provided with a flushing fluid input pipe, and the pump cover is provided with a flushing fluid discharge pipe. And a flushing fluid input pipe and a flushing fluid discharge pipe are arranged, so that the flushing fluid can be conveniently supplemented and replaced. The flushing fluid input pipe and the flushing fluid discharge pipe can be connected into the flushing fluid circulation pipeline under the working condition that the conveying pump runs at high speed or for a long time.

Preferably, the orifice of the flushing liquid input pipe and the orifice of the flushing liquid discharge pipe are provided with screw plugs. When the transfer pump runs at low speed or for a short time, the flushing liquid input pipe and the flushing liquid discharge pipe orifices can be sealed by screw plugs, and the flushing liquid in the flushing liquid cavity is enough to keep the lubrication and cooling of the first mechanical sealing element.

Preferably, a partition wall for separating the flushing liquid cavity from the pump cavity is arranged in the pump cylinder, the pump shaft penetrates through the partition wall, and the first mechanical sealing piece is arranged in the center of the partition wall. The flushing liquid cavity and the pump cavity can be separated through the partition wall.

Preferably, the pump barrel comprises a first barrel section, a second barrel section and a third barrel section, wherein the second barrel section is positioned between the first barrel section and the third barrel section, and the barrel sections are connected in an inserting way. The pump cylinder is internally provided with a plurality of cabins, the disposable processing and forming difficulty is high, the pump cylinder is processed and assembled in sections, and the manufacturing difficulty can be greatly reduced.

Preferably, O-rings are arranged between the embedded matching surfaces between the barrel sections. The O-shaped ring can ensure the detachment between the barrel sections and can meet the sealing requirement.

Preferably, the multistage conveying pump for the easily crystallized medium further comprises a screw locking assembly, and the barrel sections are connected into a whole through the screw locking assembly. The locking assembly can be axially locked after the barrel sections are inserted and connected.

The beneficial effects of the utility model are as follows:

the method is suitable for conveying the easily crystallized medium and eliminates the adverse effect of the easily crystallized medium on the sealing performance of the conveying valve. The utility model can prevent the crystallization substance particles from causing the roughness of the contact surface between the dynamic ring and the static ring, ensure the sealing surface between the dynamic ring and the static ring of the mechanical seal to be always wet and smooth, keep low friction and low loss and ensure the sealing effect of the mechanical seal.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

In the figure, the pump comprises a 1-pump cover, a 2-pump shaft, a 3-flushing fluid cavity, a 4-pump cylinder, a 5-second mechanical seal, a 6-first mechanical seal, a 7-pump cavity, an 8-flushing fluid input pipe, a 9-flushing fluid discharge pipe, a 10-screw plug, an 11-bulkhead, a 12-O-shaped ring and a 13-chassis.

Detailed Description

The utility model will be further described with reference to specific embodiments in the drawings.

Examples:

as shown in fig. 1, the multistage conveying pump for the easily crystallized medium comprises a pump cover 1, a pump shaft 2, a pump cylinder 4 and a chassis 13, wherein the pump cylinder 4 is connected to the top of the chassis 13, the pump cover 1 is connected to the top of the pump cylinder 4, and the pump cover 1 penetrates through the pump cover 1, stretches into the pump cylinder 4 and is positioned on the axis of the pump cylinder 4. The pump cylinder 4 is internally provided with a pump cavity 7 for pressurizing media, a flushing fluid cavity 3 is further arranged between the pump cover 1 and the pump cavity 7, a first mechanical sealing element 6 sleeved on the pump shaft 2 is arranged between the flushing fluid cavity 3 and the pump cavity 7, and a second mechanical sealing element 5 is arranged at the connecting part of the pump cover 1 and the pump shaft 2. The flushing liquid is water. The first mechanical sealing element 6 and the second mechanical sealing element 5 are all in the prior art, and are composed of a static ring, a movable ring, a spring, a movable ring sealing ring, a static ring sealing ring and the like, the static ring and the movable ring form a pair of friction pairs, and the friction pairs have the effect of preventing medium leakage. The movable ring can flexibly move in the axial direction, automatically compensate the abrasion of a sealing surface and ensure that the movable ring is well attached to the stationary ring; the stationary ring has floatability and plays a role of buffering. The pump cylinder 4 is provided with a flushing fluid input pipe 8, and the pump cover 1 is provided with a flushing fluid discharge pipe 9. The orifice of the flushing liquid input pipe 8 and the orifice of the flushing liquid discharge pipe 9 are provided with screw plugs. A screw plug 10 is also provided on the wall of the pump chamber 7. The pump cylinder 4 is internally provided with a partition wall 11 for separating the flushing liquid cavity 3 and the pump cavity 7, a through hole is arranged in the center of the partition wall 11, the pump shaft 2 passes through the through hole, the pump shaft 2 passes through the partition wall 11, and the first mechanical sealing element 6 is arranged in the through hole. The pump barrel 4 comprises a first barrel section, a second barrel section and a third barrel section, wherein the second barrel section is positioned between the first barrel section and the third barrel section, the upper end and the lower end of the second barrel section are respectively provided with a flaring, the inner diameter of the flaring is matched with the outer diameters of the first barrel section and the third barrel section, and the embedded connection between the barrel sections is realized. The pump cover 1 is connected with the first barrel section, and the third barrel section is connected with the chassis 13 in an embedded manner through the same structure. A bulkhead 11 is located on the second barrel section. O-shaped rings 12 are arranged between the embedded and inserted matching surfaces between the cylinder sections. The multistage delivery pump for the easily crystallized medium further comprises three groups of screw locking components, wherein the screw locking components are distributed around the circumferential surface of the delivery pump, each group of screw locking components comprises a screw rod, a screw rod seat and a nut, the screw rod seat is fixed on the pump cover 1, the nut is fixed on the chassis 13, the screw rod penetrates through the screw rod seat and is screwed with the nut, the screw rod and the nut are screwed and tightened to enable the pump cover 1 and the chassis 13 to be tightened in opposite directions, and each barrel section is axially compressed, so that the pump cover 1, the pump barrel 4 and the chassis 13 are connected into a whole.

When the multistage conveying pump for the easily crystallized medium runs at high speed or for a long time, screw plugs on the flushing fluid input pipe 8 and the flushing fluid discharge pipe 9 are removed, and the flushing fluid input pipe 8 and the flushing fluid discharge pipe 9 are connected into a flushing fluid circulation pipeline, so that the flushing fluid in the flushing fluid cavity 3 keeps flowing, and heat generated by a friction pair of the first mechanical sealing element 6 can be taken away rapidly. The first mechanical seal 6 is positioned in the flushing liquid, so that liquid film evaporation between friction pairs of the first mechanical seal 6 can be prevented, and crystallization can be effectively prevented. The flushing liquid will lubricate and cool the first mechanical seal 6 even under dry running or vacuum conditions of the pump chamber 7. When the multistage conveying pump for the easily crystallized medium runs at a low speed or in a short time, screw plugs on the flushing fluid input pipe 8 and the flushing fluid discharge pipe 9 do not need to be removed, and the flushing fluid in the flushing fluid cavity is enough to keep lubrication and cooling of the first mechanical sealing element.

Claims

1. The utility model provides an easy crystallization medium multistage delivery pump, includes pump cover (1), pump shaft (2) and pump barrel (4), is equipped with pump chamber (7) in pump barrel (4), still is equipped with flushing fluid chamber (3) between characterized by pump cover (1) and pump chamber (7), is equipped with first mechanical seal spare (6) of cup jointing on pump shaft (2) between flushing fluid chamber (3) and pump chamber (7), and pump cover (1) and pump shaft (2) connecting portion are equipped with second mechanical seal spare (5).

2. The multistage delivery pump for easily crystallized media according to claim 1, wherein the pump cylinder (4) is provided with a flushing fluid input pipe (8), and the pump cover (1) is provided with a flushing fluid discharge pipe (9).

3. The multistage delivery pump for easily crystallized media according to claim 1, wherein the orifice of the flushing liquid input pipe (8) and the orifice of the flushing liquid discharge pipe (9) are provided with screw plugs.

4. The multistage transfer pump for easily crystallized media according to claim 1, characterized in that a partition wall (11) for separating the flushing liquid cavity (3) and the pump cavity (7) is arranged in the pump cylinder (4), the pump shaft (2) penetrates through the partition wall (11), and the first mechanical sealing element (6) is arranged in the center of the partition wall (11).

5. The multistage pump for easily crystallized medium according to claim 1, 2, 3 or 4, wherein the pump cylinder (4) comprises a first cylinder section, a second cylinder section and a third cylinder section, the second cylinder section is positioned between the first cylinder section and the third cylinder section, and the cylinder sections are connected in an inserting manner.

6. The multistage delivery pump for easily crystallized media according to claim 5, wherein O-rings (12) are provided between the mating surfaces of the cartridge sections.

7. The multi-stage delivery pump of claim 5, further comprising a screw locking assembly, wherein the barrel sections are integrally connected by the screw locking assembly.