CN113090535B - High-temperature medium pump particle-resistant slurry hydraulic device - Google Patents

Abstract

The invention relates to a high-temperature medium pump anti-particle slurry hydraulic device. A water outlet section is fixedly connected with an inlet cover plate to form a pump cavity, and an impeller and a shaft sleeve are installed and fixed on the shaft in series to form a drive rotor assembly placed in the pump cavity. An annular first gap is formed between the shaft sleeve and the 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 has a liquid inlet, and the water outlet section has a liquid outlet and The liquid return port, the high temperature medium enters the pump cavity from the liquid inlet, and flows through the impeller to form the main liquid flow, the first leakage flow and the second leakage flow. The main liquid flow is discharged from the liquid outlet, and the first leakage flow passes through the annular first leakage flow. The gap flows out from the liquid return port, and the second leakage flow returns to the liquid inlet through the annular second gap. The anti-particle slurry hydraulic device of the high-temperature medium pump according to the present invention can effectively reduce the accumulation of the particle slurry in the high-temperature medium in the pump, smoothly discharge it out of the pump, and greatly prolong the service life and operation reliability of the pump.

Description

A high-temperature medium pump anti-particle slurry hydraulic device

technical field

The invention relates to a hydraulic device, and more particularly to a high-temperature medium pump anti-particle slurry hydraulic device.

Background technique

Molten salt reactor is one of the six candidate reactor types for fourth-generation nuclear energy systems in the world. It has the advantages of good neutron economy, less radioactive waste, high power density, inherent safety and nuclear proliferation prevention. In 2011, the Chinese Academy of Sciences launched a strategic pilot project for the future advanced fission nuclear energy-thorium-based molten salt nuclear energy system (TMSR). The thorium-based molten salt reactor uses high-temperature fluorine salt as the coolant, and the working temperature reaches 700 °C. Due to the complex composition of the actual molten salt in the high-temperature molten salt of the reactor, after a period of time, the molten salt may contain graphite debris, corrosion products, precipitation products and other impurities, which will form particles and suspended matter, which will circulate through the reactor with the molten salt. The main circulating pump is easy to enter the pump gap, causing the pump to be scratched, causing the shaft to be stuck, and it is easy to precipitate and accumulate in the low-speed area of the pump, forming a slag pile to accelerate the corrosion of the metal surface, or the particle slurry entering the dynamic and static surfaces directly causes the pump to intensify grinding and locking.

SUMMARY OF THE INVENTION

In order to solve the problem of pump damage caused by the granular slurry in the molten salt in the prior art, the present invention provides a high-temperature medium pump anti-particle slurry hydraulic device.

The high-temperature medium pump anti-particle slurry hydraulic device according to the present invention includes an impeller, a shaft, a shaft sleeve, a water outlet section, an inlet cover plate and a labyrinth ring, wherein the water outlet section and the inlet cover plate are fixedly connected to form a pump cavity, and the impeller It is installed and fixed on the shaft in series with the shaft sleeve to form the drive rotor assembly placed in the pump cavity. An annular first gap is formed between the shaft sleeve and the central hole of the water outlet section, and the labyrinth ring is arranged between the impeller and the inlet cover to Provide an annular second gap, the inlet cover plate has a liquid inlet, the water outlet section has a liquid outlet and a liquid return port, the high temperature medium enters the pump cavity from the liquid inlet, and flows through the impeller to form the main liquid flow, the first leakage flow and the first leakage flow. Two leakage flows, wherein 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 to the liquid inlet through the annular second gap.

Preferably, a conical surface drainage structure is designed on the back of the water outlet section, and the conical surface drainage structure includes a conical surface and a star-shaped boss, wherein the star-shaped boss protrudes axially (upward) from the conical surface and is defined in the circumferential direction A star shape is formed, thereby forming an outer ring on the back of the water outlet section to confine the first leakage flow to the conical surface.

Preferably, the star-shaped boss defines a plurality of star-shaped depressions and a plurality of guide segments therebetween, and a plurality of liquid return ports are formed at the radially most distal ends of the star-shaped depressions.

Preferably, a plurality of liquid return ports are located on an outer circle of a cone, a plurality of guide segments are located on an inner circle of the cone, and the first leakage flow flows to the liquid return ports on the outer circle of the cone by means of the guidance of the guide segments on the inner circle of the cone .

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

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

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

Preferably, the labyrinth mouth ring is arranged on the outer diameter mating surface of the impeller and the inlet cover plate, which includes the impeller mouth ring and the cover plate mouth ring which cooperate with each other to provide the annular second gap, wherein the impeller mouth ring is fixedly connected to the impeller , the cover plate mouth ring is fixedly connected to the cover plate, the impeller mouth ring has an inverted right-angled trapezoidal labyrinth tooth structure, and the cover plate mouth ring is a cylindrical ring surface, and the two form a submerged labyrinth structure.

Preferably, the annular first gap adopts an inverted conical structure.

Preferably, the back of the bushing is designed with radially outwardly projecting shoulders.

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

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

According to the anti-particle slurry hydraulic device of the high-temperature medium pump of the present invention, the high-temperature medium containing impurity particles can be smoothly discharged from the pump cavity in time, and the accumulation of particle slurry in the pump cavity, scratches on the dynamic and static surfaces, wear, and dynamic and static interference of the shaft can be effectively avoided. The occurrence of other accidents will greatly extend the service life and operation reliability of the pump in the slurry environment containing particles. In a word, according to the high-temperature medium pump anti-granular slurry hydraulic device of the present invention, the accumulation of granular slurry in the high-temperature medium in the pump can be effectively reduced, and the slurry can be discharged out of the pump smoothly.

Description of drawings

1 is a cross-sectional view of a high-temperature medium pump anti-particle slurry hydraulic device according to a preferred embodiment of the present invention;

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

FIG. 3 is a partial enlarged view of FIG. 1 , which shows the specific structure of the labyrinth mouth ring.

Detailed ways

Below in conjunction with the accompanying drawings, preferred embodiments of the present invention are given and described in detail.

As shown in FIG. 1 , according to a preferred embodiment of the present invention, the high-temperature medium pump anti-particle slurry hydraulic device includes an impeller 1, a shaft 2, a locking nut 3, a shaft sleeve 4, a water outlet section 5, an inlet cover 6, a stopper The flow ring 7 and the labyrinth ring 8, wherein the water outlet section 5 and the inlet cover plate 6 are fixedly connected by bolts to form a pump chamber, and the impeller 1 and the shaft sleeve 4 are installed and fixed on the shaft 2 in series through the lock nut 3 to form a pump chamber. In the driving rotor assembly in the pump cavity, an annular first gap is formed between the shaft sleeve 4 and the central hole of the water outlet section 5, the baffle ring 7 is arranged at the outlet of the annular first gap, and the labyrinth ring 8 is arranged at the impeller 1 and the outlet. An annular second gap is provided between the inlet cover plates 6 . The high-temperature medium (such as molten salt medium) containing particle slurry (also called impurity particles) enters the pump chamber through the liquid inlet 61 of the inlet cover plate 6, and is divided into three parts after flowing through the impeller 1, most of which form the main liquid. The flow is discharged from the liquid outlet 51 of the water outlet section 5, and the other part forms the first leakage flow (also known as the axial leakage flow or the upper gap leakage flow) through the annular first gap and leaks upward to the back of the water outlet section 5 and then flows out (via The liquid return port 52 or the baffle ring 7 flows out afterward), and another part forms the second leakage flow and leaks back down to the liquid inlet port 61 through the annular second gap.

The back of the impeller 1 is designed with a straight-through back blade, which controls the leakage of the back of the impeller 1 and discharges the particle slurry on the back. Specifically, under the rotating centrifugal force, the straight-through back vane can reduce the pressure of the first leakage flow, and the large specific gravity particles in the leakage flow are decelerated, separated and thrown out under the action of the back vane, preventing entry into the annular first gap and avoiding The mating surface of the shaft sleeve 4 and the water outlet section 5 is scratched or even stuck. It should be understood that the selection of the straight-through back blade here mainly considers the centrifugal throwing out of particulate impurities, and its proper leakage is beneficial to the slag discharge at the bushing position.

The back of the shaft sleeve 4 is designed with a shoulder 41, which protrudes radially outwards, which can change the axial leakage flow and the flow direction of the particle slurry from the axial direction to the radial direction and throw it out in time under centrifugal force, so as to pass the timely disturbance. And throw out the particle slurry in the axial leakage flow to prevent the precipitation and accumulation of impurity particles.

The annular surface of the water outlet section 5 and the shaft sleeve 4 adopts an inverted conical structure, and the granular slurry in the axial leakage flow flows through this gap with the leakage, and the flow rate increases, which improves the discharge capacity of the granular slurry. It is deposited in the inverted cone cavity to the back of the impeller 1 below, and is thrown out by the rotating impeller 1 under the centrifugal force, so as to avoid a large amount of particle slurry depositing in the gap. That is to say, the inner hole of the water outlet section 5 is designed as a conical hole, which forms a cone-ring gap with the shaft sleeve 4. Small particles or slag enter the cone-ring gap through the back blade, the gap becomes larger and the flow rate decreases, and some particles are slowed down and precipitated. Throwing out from the back blade, the impurities that continue upwards will be quickly separated and discharged with the reduction of the cone hole, and the flow velocity will be accelerated.

The back of the water outlet section 5 is designed with a conical surface drainage structure, and the axial leakage flow is collected and drained to the liquid return port 52 through the form of a high center and a low peripheral edge, so as to avoid accumulation of impurities. Specifically, the conical surface drainage structure includes a conical surface 53 and a star-shaped boss 54 , wherein the star-shaped boss 54 axially protrudes from the lower part of the conical surface 53 and defines a star shape in the circumferential direction, see FIG. 2 , the star-shaped boss 54 is formed as an outer ring on the back of the water outlet section 5 to limit the axial leakage flow to the conical surface 53 . In this embodiment, the star-shaped boss 54 includes seven star-shaped depressions 541 and six guide segments 542 therebetween, and seven liquid return ports 52 are formed at the radially most distal end of the star-shaped depressions 541 . As shown in FIG. 2 , the seven liquid return ports 52 are located on the outer circle of the cone, and the six guide segments 542 are located on the inner circle of the cone. The first leakage flow flows from the center to the periphery, and it is on the inner circle of the cone by means of the guide segments 542 The guide continues to flow to the liquid return port 52 on the outer circle of the cone to prevent impurities from accumulating.

Returning to FIG. 1 , the baffle ring 7 is arranged at the top (highest) position of the conical surface drainage structure of the water outlet section 5 , and the axial leakage flow is thrown out from the shoulder 41 into the baffle ring 7 , and downward along the The conical surface 53 on the back scours the deposited impurity particles or slurry to the bottom of the cone for timely discharge. Specifically, the baffle ring 7 adopts a double-layer structure, which blocks the jet of the axial leakage flow and avoids the reverse flow of impurities. When the particles reach the top of the lower horizontal plate, due to the speed reduction, they are precipitated or discharged from the side holes above the lower horizontal plate, and will not return in reverse flow.

The labyrinth mouth ring 8 is arranged on the outer diameter mating surface of the impeller 1 and the inlet cover plate 6, and it includes an impeller mouth ring 81 and a cover plate mouth ring 82 that cooperate with each other to provide an annular second gap, wherein the impeller mouth ring 81 passes through, for example, The impeller 1 is fixedly connected with screws, and the cover plate mouth ring 82 is fixedly connected to the cover plate 6 by means of screws, for example. It should be understood that in principle, the impeller mouth ring 81 and the cover plate mouth ring 82 can be directly provided by the impeller 1 and the inlet cover plate 6, but considering that the engineering mouth ring is a wearing part, if dynamic and static interference wear does occur, the labyrinth The provision of the orifice ring 8 as a separate piece will facilitate the replacement of the orifice ring without replacing the impeller 1 and the inlet cover plate 6 . Specifically, the impeller orifice ring 81 has an inverted right-angled trapezoidal labyrinth tooth structure (particles cannot be accumulated on the trapezoidal slope), and the cover plate orifice ring 82 is a cylindrical toroid, both of which form a submerged labyrinth structure to prevent leakage while reducing leakage. The particle slurry deposits and wears the mouth ring to prevent the downward leakage of the particle slurry from staying in the labyrinth and causing static and dynamic interference accidents. In addition, the inlet cover plate 6 is designed as a slope 62 below the cover plate mouth ring 82, so that impurities leaking downward through the labyrinth mouth ring 8 can be discharged in time.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Various changes can be made to the above-mentioned embodiments of the present invention. That is, all simple and equivalent changes and modifications made according to the claims and descriptions of the present invention fall into the protection scope of the claims of the present invention. What is not described in detail in the present invention is conventional technical content.

Claims (7)

1. The high-temperature medium pump hydraulic device capable of resisting particle slag slurry is characterized by comprising 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 installed and fixed on the shaft in series to form a driving rotor assembly arranged in the pump cavity, an annular first gap is formed between the central conical holes of the shaft sleeve and 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 flows through the impeller to form a main liquid flow, a first leakage flow and a second leakage flow, 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 slag slurry in the first leakage flow is precipitated to the back of the impeller due to the fact that the flow velocity is reduced when the gap is increased when the slag slurry enters the conical holes The impeller throws away the slurry, then the slurry is accelerated and discharged upwards to avoid the deposition of the slurry in the annular first gap due to the reduced flow rate of the conical hole, the back of the water outlet section is designed with a conical surface flow guiding structure which comprises a conical surface and a star-shaped boss, wherein the star-shaped boss axially protrudes from the conical surface and defines a star shape in the circumferential direction, so that the outer ring of the back of the water outlet section is formed to limit the first leakage flow to the conical surface and make the first leakage flow from the center to the periphery to prevent the accumulation of impurities on the back of the water outlet section, the second leakage flow returns to the liquid inlet through the annular second gap, the labyrinth ring is arranged on the outer diameter matching surface of the impeller and the inlet cover plate and comprises an impeller opening ring and a cover plate opening ring which are matched with each other to provide the annular second gap, wherein the impeller opening ring is fixedly connected on the impeller, the cover plate opening ring is fixedly connected on the inlet cover plate, the impeller opening ring is provided with an inverted right-angle trapezoid labyrinth tooth structure, the cover plate opening ring is a cylindrical ring surface, the cover plate opening ring and the cylindrical ring surface form a submerged labyrinth structure, and the inlet cover plate is designed into a slope below the cover plate opening ring so as to be convenient for timely discharging of impurities leaked downwards through the labyrinth opening ring.

2. The high temperature media pump particulate resistant slurry hydralic apparatus of claim 1, wherein 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.

3. The high temperature media pump hydraulic apparatus against particle slurry according to claim 2, 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 to the return ports on the outer circle of the cone on the inner circle of the cone by means of the guide sections.

4. The high-temperature medium pump particulate slag slurry resistant hydraulic device according to claim 1, 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.

5. The high-temperature medium pump particle-resistant slurry hydraulic device as claimed in claim 4, wherein the flow blocking ring is arranged at the vertex of the cone-shaped drainage structure of the water outlet section.

6. The high-temperature medium pump particle-resistant slurry hydraulic device as claimed in claim 4, wherein the baffle ring is of a double-layer structure.

7. 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.

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