CN113090535A

CN113090535A - High-temperature medium pump particle-resistant slurry hydraulic device

Info

Publication number: CN113090535A
Application number: CN202110447824.3A
Authority: CN
Inventors: 林良程; 傅远; 王俊伟; 薛祥龙; 蒲宁
Original assignee: Shanghai Institute of Applied Physics of CAS
Current assignee: Shanghai Institute of Applied Physics of CAS
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2021-07-09
Anticipated expiration: 2041-04-25
Also published as: CN113090535B

Abstract

The invention relates to a high-temperature medium pump hydraulic device for resisting particle slag slurry, wherein a water outlet section is fixedly connected with an inlet cover plate to form a pump cavity, an impeller and a shaft sleeve are fixedly arranged on a shaft in series to form a driving rotor assembly arranged in the pump cavity, an annular first gap is formed between the shaft sleeve and a central hole of the water outlet section, a labyrinth ring is arranged between the impeller and the inlet cover plate to provide an annular second gap, the inlet cover plate is provided with a liquid inlet, the water outlet section is provided with a liquid outlet and a liquid return port, high-temperature medium enters the pump cavity from the liquid inlet, and forms a main liquid flow, a first leakage flow and a second leakage flow after flowing through the impeller, the main liquid flow is discharged from the liquid outlet, the first leakage flow flows out from the liquid return port through the annular first gap, and the second leakage flow returns. According to the high-temperature medium pump anti-particle slurry hydraulic device, the accumulation of particle slurry in a high-temperature medium in the pump can be effectively reduced, the particle slurry is smoothly discharged out of the pump, and the service life and the operation reliability of the pump are greatly prolonged.

Description

High-temperature medium pump particle-resistant slurry hydraulic device

Technical Field

The invention relates to a hydraulic device, in particular to a high-temperature medium pump anti-particle slurry hydraulic device.

Background

The molten salt reactor is one of six fourth generation nuclear energy system candidate reactors internationally, and has the advantages of good neutron economy, less radioactive wastes, high power density, inherent safety, nuclear diffusion prevention and the like. In 2011, the Chinese academy of sciences started the future advanced fission nuclear energy-thorium-based molten salt nuclear energy system (TMSR) research of strategic leading special item. The thorium-based molten salt reactor adopts high-temperature fluorine salt as a coolant, and the working temperature reaches 700 ℃. Because the actual molten salt components in the reactor high-temperature molten salt are complex, the molten salt is allowed to possibly contain graphite scraps, corrosion products, precipitated products and other impurities after a period of time, the graphite scraps, the corrosion products, the precipitated products and the other impurities can form particles and suspended matters, the particles and the suspended matters flow through the reactor main circulating pump along with the molten salt in a circulating manner, easily enter a pump gap to cause dynamic and static scratches of a pump, induce shaft clamping, easily precipitate and accumulate in a low-speed area of the pump to form a slag pile to accelerate metal surface corrosion, or particle slag slurry enters a dynamic and static surface to directly cause the pump to.

Disclosure of Invention

In order to solve the problem that the pump is damaged due to the particle slurry in the molten salt in the prior art, the invention provides a high-temperature medium pump particle slurry resistant hydraulic device.

The high-temperature medium pump hydraulic device for resisting particle slag slurry comprises an impeller, a shaft sleeve, a water outlet section, an inlet cover plate and a labyrinth ring, wherein the water outlet section is fixedly connected with the inlet cover plate to form a pump cavity, the impeller and the shaft sleeve are fixedly arranged on the shaft in series to form a driving rotor assembly arranged in the pump cavity, an annular first gap is formed between the shaft sleeve and a central hole of the water outlet section, the labyrinth ring is arranged between the impeller and the inlet cover plate to provide an annular second gap, the inlet cover plate is provided with a liquid inlet, the water outlet section is provided with a liquid outlet and a liquid return port, high-temperature medium enters the pump cavity from the liquid inlet, and forms a main liquid flow, a first leakage flow and a second leakage flow after flowing through the impeller, wherein the main liquid flow is discharged from the liquid outlet, the first leakage flow flows from the liquid return port through the annular first gap, and the second leakage flow returns to the liquid.

Preferably, the back of the outlet section is designed with a conical surface drainage structure comprising a conical surface and a star-shaped boss, wherein the star-shaped boss protrudes axially (upwards) from the conical surface and defines a star shape in the circumferential direction, thereby constituting an outer ring of the back of the outlet section to confine the first leakage flow to the conical surface.

Preferably, the star boss defines a plurality of star recesses and a plurality of guide segments therebetween, the plurality of fluid return ports being formed at a radially outermost end of the star recesses.

Preferably, the plurality of return openings are located on an outer cone of the cone, the plurality of guide sections are located on an inner cone of the cone, and the first leakage flow is directed on the inner cone of the cone to the return openings on the outer cone of the cone by means of guidance of the guide sections.

Preferably, the high-temperature medium pump particle-resistant slurry hydraulic device further comprises a flow blocking ring which is arranged at the outlet of the annular first gap, and the first leakage flow flows out of the flow blocking ring.

Preferably, the flow blocking ring is arranged at the cone top position of the conical surface drainage structure of the water outlet section.

Preferably, the baffle ring adopts a double-layer structure.

Preferably, the labyrinth muzzle ring sets up on the external diameter fitting surface of impeller and inlet apron, and it includes impeller muzzle ring and the apron muzzle ring of mutually supporting in order to provide annular second clearance, and wherein, impeller muzzle ring fixed connection is on the impeller, and apron muzzle ring fixed connection is on the apron, and impeller muzzle ring has the trapezoidal labyrinth tooth structure of chamfered angle, and the apron muzzle ring is the cylinder ring face, and both form labyrinth structure under the liquid.

Preferably, the annular first gap is of an inverted cone structure.

Preferably, the back of the shaft sleeve is designed with a radially outwardly projecting throwing shoulder.

Preferably, the back of the impeller is designed with straight-through back blades.

Preferably, the high-temperature medium pump particle-resistant slurry hydraulic device further comprises a locking nut, and the impeller and the shaft sleeve are fixed on the shaft through the locking nut.

According to the high-temperature medium pump particle-slag-slurry-resistant hydraulic device, high-temperature media containing impurity particles can be discharged out of the pump cavity smoothly in time, accidents such as particle slag slurry accumulation, scratch of a movable surface and a static surface, abrasion, dynamic and static interference shaft clamping and the like in the pump cavity are effectively avoided, and the service life and the operation reliability of the pump are greatly prolonged in a particle-slag-slurry-containing environment. In a word, according to the high-temperature medium pump anti-particle slurry hydraulic device, the accumulation of particle slurry in a high-temperature medium in the pump can be effectively reduced, and the particle slurry is smoothly discharged out of the pump.

Drawings

FIG. 1 is a cross-sectional view of a high temperature media pump particulate slurry resistant hydro-power plant according to a preferred embodiment of the present invention;

FIG. 2 is a top view of the water outlet section of FIG. 1;

fig. 3 is a partially enlarged view of fig. 1, showing a specific structure of the labyrinth ring.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the high temperature medium pump particulate slag pulp resistant hydraulic device according to a preferred embodiment of the present invention comprises an impeller 1, a shaft 2, a locking nut 3, a shaft sleeve 4, a water outlet section 5, an inlet cover plate 6, a baffle ring 7 and a labyrinth ring 8, wherein the water outlet section 5 and the inlet cover plate 6 are fixedly connected by bolts, for example, to form a pump chamber, the impeller 1 and the shaft sleeve 4 are mounted and fixed in series on the shaft 2 by the locking nut 3 to form a driving rotor assembly disposed in the pump chamber, an annular first gap is formed between the shaft sleeve 4 and a central hole of the water outlet section 5, the baffle ring 7 is disposed at an outlet of the annular first gap, and the labyrinth ring 8 is disposed between the impeller 1 and the inlet cover plate 6 to provide an annular second gap. The high-temperature medium (such as molten salt medium) containing particle slurry (also called foreign particles) enters the pump cavity from the liquid inlet 61 of the inlet cover plate 6, flows through the impeller 1 and is divided into three parts, wherein most of the high-temperature medium forms a main liquid flow and is discharged from the liquid outlet 51 of the water outlet section 5, another part forms a first leakage flow (also called axial leakage flow or upper gap leakage flow) and leaks to the back of the water outlet section 5 through the annular first gap and then flows out (flows out after passing through the liquid return port 52 or the baffle ring 7), and the other part forms a second leakage flow and leaks back to the liquid inlet 61 through the annular second gap.

The back of the impeller 1 is designed with a straight-through back blade, and particle slag slurry on the back is discharged while the leakage amount on the back of the impeller 1 is controlled. Specifically, under the action of rotary centrifugation, the straight-through back blade can reduce the pressure of first leakage flow, large-specific gravity particles in the leakage flow are subjected to speed reduction separation and are thrown out under the action of the back blade, the particles are prevented from entering an annular first gap, and the matching surface between the shaft sleeve 4 and the water outlet section 5 is prevented from being scratched and even clamped. It should be understood that the straight-through back vane is selected mainly in consideration of centrifugal throwing-off of particle impurities, and the proper leakage amount is favorable for slag discharge of the shaft sleeve position.

The back of the shaft sleeve 4 is provided with a throwing shoulder 41 which extends outwards in the radial direction and can change the axial leakage flow and the flow direction of the particle slag slurry from the axial direction to the radial direction and throw the particle slag slurry out in time under the centrifugal force, thereby preventing the deposition and accumulation of impurity particles by timely disturbing and throwing the particle slag slurry out of the axial leakage flow.

Go out water section 5 and axle sleeve 4 complex anchor ring and adopt the back taper structure, the granule sediment thick liquid in the axial leakage flow flows through this clearance along with the leakage, and the velocity of flow increases, improves the discharge capacity of granule sediment thick liquid, to large granule sediment thick liquid, deposits the back of impeller 1 to the below in the back taper chamber, is thrown away under centrifugal force by rotatory impeller 1, avoids granule sediment thick liquid a large amount of deposits in the clearance. That is to say, the inner hole of the water outlet section 5 is designed into a taper hole, and forms a taper ring gap with the shaft sleeve 4, small particles or slurry pass through the back blade and enter the taper ring gap, the flow rate of the gap is increased, part of particles are precipitated at a reduced speed and are thrown out by the back blade, and impurities which continuously go upwards are reduced along with the taper hole, the flow rate is increased, and the impurities are quickly separated and discharged.

The back of the water outlet section 5 is designed with a conical surface drainage structure, axial leakage flow is converged and drained to the liquid return port 52 to be discharged in a mode that the center is high and the periphery is low, and impurity accumulation is avoided. In particular, the cone drainage structure comprises a cone surface 53 and a star-shaped boss 54, wherein the star-shaped boss 54 protrudes axially from the lower part of the cone surface 53 and defines a star shape in the circumferential direction, see fig. 2, the star-shaped boss 54 being configured as an outer ring at the back of the outlet section 5 to confine the axial leakage flow to the cone surface 53. In the present embodiment, the star-shaped boss 54 includes seven star-shaped depressions 541 and six guide sections 542 therebetween, and seven liquid return ports 52 are formed at the radially outermost ends of the star-shaped depressions 541. As shown in fig. 2, seven liquid return ports 52 are located on the outer circle of the cone, six guide sections 542 are located on the inner circle of the cone, and the first leakage flow flows from the center to the periphery, and continues to flow to the liquid return ports 52 on the outer circle of the cone on the inner circle of the cone by means of guidance of the guide sections 542, preventing accumulation of impurities.

Returning to fig. 1, the flow blocking ring 7 is disposed at the vertex (highest) position of the conical surface drainage structure of the water outlet section 5, the axial leakage flow is thrown out by the throw shoulder 41 into the flow blocking ring 7, and the deposited impurity particles or slurry is washed downwards along the conical surface 53 on the back surface of the water outlet section 5 until reaching the bottom of the conical surface and is discharged in time. Specifically, keep off and flow ring 7 adopts bilayer structure, blocks axial leakage flow injection, avoids impurity palirrhea simultaneously, that is to say, most fluid blocks the back through upper diaphragm, changes the flow direction, and speed reduces, and the granule through diaphragm down has arrived diaphragm top down and because of speed reduction, deposits or discharges from the side opening of diaphragm top down, can not return against the current.

The labyrinth ring 8 is disposed on the outer diameter mating surfaces of the impeller 1 and the inlet cover plate 6, and includes an impeller opening ring 81 and a cover plate opening ring 82 that mate with each other to provide an annular second gap, wherein the impeller opening ring 81 is fixedly attached to the impeller 1, for example, by screws, and the cover plate opening ring 82 is fixedly attached to the cover plate 6, for example, by screws. It will be appreciated that in principle the impeller eye 81 and the cover eye 82 may be provided directly by the impeller 1 and the inlet cover plate 6, but that the provision of the labyrinth eye 8 as a separate piece will facilitate replacement of the eye, in view of the fact that the engineering eye is a wearing part, such as where dynamic and static interference wear is occurring, without replacing the impeller 1 and the inlet cover plate 6. Specifically, impeller choma 81 has the trapezoidal labyrinth tooth structure of chamfer (the granule can't pile up on trapezoidal inclined plane), and apron choma 82 is the post anchor ring, and both form under liquid labyrinth structure in order to reduce when letting out leakage quantity, prevent granule sediment thick liquid deposit and wearing and tearing choma, prevent that the granule sediment thick liquid that leaks downwards is detained and causes sound interference accident in the maze. In addition, the inlet cover plate 6 is designed as a ramp 62 below the cover plate opening ring 82, so that impurities which leak downward through the labyrinth opening ring 8 can be discharged in time.

The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.

Claims

1. The high-temperature medium pump granular slag slurry resistant hydraulic device is characterized by comprising an impeller, a shaft sleeve, a water outlet section, an inlet cover plate and a labyrinth mouth ring, wherein, the water outlet section is fixedly connected with the inlet cover plate to form a pump cavity, the impeller and the shaft sleeve are installed and fixed on the shaft in series to form a driving rotor component arranged in the pump cavity, an annular first gap is formed between the shaft sleeve and a central hole of the water outlet section, a labyrinth ring is arranged between the impeller and the inlet cover plate to provide an annular second gap, the inlet cover plate is provided with a liquid inlet, the water outlet section is provided with a liquid outlet and a liquid return port, high-temperature medium enters the pump cavity from the liquid inlet and forms a main liquid flow, a first leakage flow and a second leakage flow after flowing through the impeller, wherein the main flow is discharged from the liquid outlet, the first leakage flow flows out from the liquid return port through the annular first gap, and the second leakage flow returns to the liquid inlet through the annular second gap.

2. The high temperature media pump particulate slag slurry resistant hydraulic device of claim 1, wherein the back of the water outlet section is designed with a conical surface flow directing structure comprising a conical surface and a star shaped boss, wherein the star shaped boss protrudes axially from the conical surface and defines a star shape in a circumferential direction, thereby constituting an outer ring of the back of the water outlet section to confine the first leakage flow to the conical surface.

3. The high temperature media pump particulate resistant slurry hydraulics according to claim 2 wherein the star boss defines a plurality of star-shaped recesses and a plurality of guide segments therebetween, the plurality of fluid return ports being formed at radially outermost ends of the star-shaped recesses.

4. The high temperature media pump particulate slag slurry resistant hydraulic apparatus of claim 3, wherein the plurality of return ports are located on an outer circle of a cone, the plurality of guide sections are located on an inner circle of the cone, and the first leakage flow is directed on the inner circle of the cone to the return ports on the outer circle of the cone by means of the guide sections.

5. The high-temperature medium pump particulate slag slurry resistant hydraulic device according to claim 2, further comprising a flow blocking ring disposed at an outlet of the annular first gap, wherein the first leakage flow flows out of the flow blocking ring.

6. The high-temperature medium pump particle-resistant slurry hydraulic device as claimed in claim 5, wherein the flow blocking ring is arranged at the vertex of the cone-shaped drainage structure of the water outlet section.

7. The high-temperature medium pump particle-resistant slurry hydraulic device as claimed in claim 5, wherein the baffle ring is of a double-layer structure.

8. The high temperature media pump particulate slag slurry resistant hydraulic apparatus of claim 1, wherein the labyrinth lip ring is disposed on the outer diameter mating surfaces of the impeller and the inlet cover plate, and comprises an impeller lip ring and a cover plate lip ring that mate with each other to provide a second annular gap, wherein the impeller lip ring is fixedly connected to the impeller, the cover plate lip ring is fixedly connected to the cover plate, the impeller lip ring has an inverted right trapezoid labyrinth tooth structure, and the cover plate lip ring is a cylindrical ring surface, both of which form a submerged labyrinth structure.

9. The high-temperature medium pump particle-resistant slurry hydraulic device as claimed in claim 1, wherein the annular first gap is of an inverted cone structure.

10. The high-temperature medium pump granular slag pulp resisting hydraulic device as claimed in claim 1, wherein the back of the shaft sleeve is designed with a radially outwardly extending throwing shoulder.