Axial-flow type high-temperature liquid metal circulating pump

Abstract

The invention relates to the technical field of axial flow pumps, in particular to an axial flow type high-temperature liquid metal circulating pump which comprises a liquid discharging pipe, a liquid inlet pipe and two pump bodies, the input ends and the output ends of the two pump bodies are fixedly connected with the liquid inlet pipe and the liquid discharging pipe, and liquid supplementing assemblies are movably installed in the pump bodies. The liquid supplementing assembly comprises a sliding barrel and a rotating shaft, and the sliding barrel is movably installed in the pump body. The pump body is supplemented with liquid through upward movement of the sliding barrel, gas in the pump body is discharged at the same time, the pump body replacement efficiency is improved, high-temperature liquid continuously enters the liquid discharging pipe through rotation of the sliding barrel, the gas in the pump body is further discharged, the high-temperature liquid in the pump body is discharged through downward movement of the sliding barrel, and the pump body replacement efficiency is improved. And meanwhile, the pump bodies are cleaned, workers are prevented from being hurt during overhauling, through switching between the two pump bodies, the damaged impeller can be effectively disassembled without stopping circulation, and the efficiency of the liquid metal cooling reactor system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of axial flow pumps, and in particular to an axial flow high-temperature liquid metal circulation pump. Background Art

[0002] High-temperature liquid metal circulation pumps are the core operating equipment of fourth-generation liquid metal-cooled reactor systems such as lead-cooled fast reactors. Their performance directly determines the thermal safety, operational stability, and economy of advanced nuclear energy systems. Liquid metal coolants usually have physical properties such as high temperature, high flow rate, high density, and strong corrosiveness. Its axial flow centrifugal pumps, with their large flow rate and low head, can effectively circulate high-temperature lead, bismuth, molten salts and other liquids between different equipment and process sections. In the reactor, the axial flow pump can continuously circulate the high-temperature materials involved in the reaction to maintain the uniformity of temperature and concentration in the reaction system, thereby promoting the full circulation. However, during the long-term operation of the axial flow pump circulating high-temperature liquids, components such as the pump body and impeller will experience creep and thermal fatigue, corrosion, abrasion, etc., accompanied by problems such as large system vibration and noise, and low reliability. This requires the damaged axial flow pump to be disassembled and replaced, but the high temperature The characteristics of liquids bring many challenges to the disassembly of axial flow pumps. The temperature of high-temperature liquids is usually much higher than room temperature. If not handled properly during disassembly, it is very easy to cause burns to the operators. In addition, the circulation of high-temperature liquids needs to be stopped during disassembly, which greatly affects the efficiency of fourth-generation liquid metal-cooled reactor systems such as lead-cooled fast reactors. After replacing a new axial flow pump, not only does the pump body need to be replenished with fluid, but the air inside the pump body also needs to be discharged (under high-temperature, high-density liquid metal flow conditions, the fluctuation of oxygen concentration in liquid lead-bismuth alloy has a significant impact on the material corrosion and wear behavior of the axial flow pump). Not only is the operation cumbersome and affects the replacement efficiency, but air will also enter the circulation system and affect the stability of the high-temperature liquid circulation. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems in the background technology and to propose an axial flow high-temperature liquid metal circulation pump.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: An axial-flow high-temperature liquid metal circulation pump, comprising a discharge pipe, a liquid inlet pipe, and two pump bodies, wherein the input and output ends of the two pump bodies are fixedly connected to the liquid inlet pipe and the discharge pipe, and a fluid replenishing assembly is movably installed inside the pump body, wherein the fluid replenishing assembly comprises a slide and a rotating shaft, wherein the slide is movably installed inside the pump body, and the rotating shaft is rotatably installed inside the pump body, and the slide is movably sleeved on the outside of the rotating shaft, and a guide plate is integrally formed inside the slide; A liquid discharge assembly is movably mounted on the outside of the pump body. The liquid discharge assembly includes an air cavity and a piston plate. The air cavity is fixedly mounted on the outside of the pump body, and the piston plate is slidably mounted inside the air cavity.

[0005] In the above-mentioned axial flow high-temperature liquid metal circulation pump, an electric motor is fixedly installed on the top of the pump body, the electric motor is fixedly connected to the rotating shaft, an impeller is fixedly installed on the bottom of the rotating shaft, the impeller is located inside the pump body, and the slide is located above the impeller.

[0006] In the above-mentioned axial flow high-temperature liquid metal circulation pump, the outer peripheral wall of the slide cylinder is integrally formed with a spiral ridge, the inner wall of the pump body is provided with a spiral groove and a slide groove 1, the slide groove 1 is located above the spiral groove, the slide groove 1 and the spiral groove are connected to each other, and the spiral ridge is slidably installed inside the spiral groove and the slide groove 1.

[0007] In the above-mentioned axial flow high-temperature liquid metal circulation pump, a spring slider is slidably installed inside the slide, a second slide groove is provided on the outer wall of the rotating shaft, the spring slider is slidably installed inside the second slide groove, a flow channel is provided inside the slide, and the discharge pipe and the pump body are connected to each other through the flow channel.

[0008] In the above-mentioned axial flow high-temperature liquid metal circulation pump, a spring ring is provided on the top of the pump body, a trigger switch is fixedly installed on the top of the pump body, and the bottom of the spring ring and the bottom of the trigger switch both conflict with the top of the slide.

[0009] In the above-mentioned axial flow high-temperature liquid metal circulation pump, a valve is movably installed at the connection between the liquid inlet pipe and the two pump bodies, and an electric valve is movably installed at the connection between the liquid discharge pipe and the two pump bodies. The electric valve is controlled by a trigger switch.

[0010] In the above-mentioned axial flow high-temperature liquid metal circulation pump, a connecting hole is opened on the top of the pump body, a connecting pipe is fixedly installed on the top of the air cavity, one end of the connecting pipe is fixedly installed inside the connecting hole, and spring 1 and spring 2 are provided between the bottom of the inner wall of the air cavity and the bottom of the piston plate.

[0011] In the above-mentioned axial flow high-temperature liquid metal circulation pump, the top and bottom of the spring one are fixedly connected to the air cavity and the piston plate respectively, the bottom of the spring two is fixedly connected to the air cavity, the top of the spring two is in conflict with the piston plate, and the elastic force of the spring two is greater than the elastic force of the spring one.

[0012] Compared with the existing technology, the beneficial effects of the present invention are: The slide is movably mounted inside the pump body, so that when the motor is started, the slide rotates and moves upward. The upward movement of the slide replenishes the pump body and discharges the air inside the pump body, improving the efficiency of pump replacement and avoiding the problem of high-temperature liquid being unable to circulate. The impeller drives the high-temperature liquid upward, so that the air below the slide is discharged into the air cavity, further discharging the air inside the pump body, and preventing air from entering the circulation system and affecting the stability of the high-temperature liquid circulation. When the slide and the discharge pipe are connected to each other, the rotation of the slide ensures continuous communication between the flow channel and the discharge pipe, and the high-temperature liquid continuously enters the discharge pipe, further discharging the air inside the pump body, and avoiding the problem of air in the high-temperature liquid circulation process. When the motor is turned off, the downward movement of the slide releases the air in the air cavity, discharges the high-temperature liquid inside the pump body, and cleans the inner wall of the pump body, preventing workers from being injured during maintenance. By switching between the two pump bodies, the damaged impeller can be effectively removed without stopping the circulation, ensuring the efficiency of the liquid metal cooled reactor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of point A in the middle; Figure 4 For the present invention Figure 2 A magnified schematic diagram of point B in the middle; Figure 5 It is a structural cross-sectional view of the pump body of the present invention; Figure 6 Schematic diagram of the structure of the rotating shaft in the present invention; Figure 7 This is a disassembly diagram of the slide in the present invention; Figure 8 This is a disassembled schematic diagram of the drainage assembly in the present invention.

[0014] In the figure: 1. discharge pipe; 11. inlet pipe; 121. valve 1; 122. electric valve; 21. pump body; 211. spiral groove; 212. connecting hole; 213. trigger switch; 214. slide 1; 22. air cavity; 221. piston plate; 222. connecting pipe; 223. spring 1; 224. spring 2; 311. motor 1; 312. rotating shaft; 313. impeller; 314. spring ring; 315. slide 2; 32. slide cylinder; 321. spiral rib; 322. spring slider; 323. guide plate; 324. flow channel. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0017] Reference Figure 1 - Figure 8 As shown, an axial flow high-temperature liquid metal circulation pump includes a discharge pipe 1, a liquid inlet pipe 11 and two pump bodies 21. The input and output ends of the two pump bodies 21 are fixedly connected to the liquid inlet pipe 11 and the discharge pipe 1. A liquid replenishing assembly is movably installed inside the pump body 21. The liquid replenishing assembly includes a slide 32 and a rotating shaft 312. The slide 32 is movably installed inside the pump body 21. The rotating shaft 312 is rotatably installed inside the pump body 21. The slide 32 is movably sleeved on the outside of the rotating shaft 312. A guide plate 323 is integrally formed inside the slide 32. A liquid discharge assembly is movably mounted on the outside of the pump body 21 , and the liquid discharge assembly includes an air cavity 22 and a piston plate 221 . The air cavity 22 is fixedly mounted on the outside of the pump body 21 , and the piston plate 221 is slidably mounted inside the air cavity 22 .

[0018] like Figure 2 and Figure 3 As shown, a spring ring 314 is provided on the top of the pump body 21, and a trigger switch 213 is fixedly installed on the top of the pump body 21. The bottom of the spring ring 314 and the bottom of the trigger switch 213 both conflict with the top of the slide 32. A valve 121 is movably installed at the connection between the liquid inlet pipe 11 and the two pump bodies 21, and an electric valve 122 is movably installed at the connection between the liquid discharge pipe 1 and the two pump bodies 21. The electric valve 122 is controlled by the trigger switch 213.

[0019] Among them, when the impeller 313 inside one of the pump bodies 21 is damaged, the motor 1 311 installed above the other pump body 21 starts and drives the impeller 313 to rotate, the electric valve 122 is in the normally closed state, and the valve 121 is in the normally open state. When the slide 32 drives the spring ring 314 to resist the trigger switch 213, the electric valve 122 close to the side of the damaged impeller 313 is closed, and the other electric valve 122 is opened, and the pump body 21 and the discharge pipe 1 are connected. At this time, the motor 1 311 above the pump body 21 with the damaged internal impeller 313 is turned off. When the pump body 21 is disassembled, the corresponding valve 121 is closed.

[0020] like Figure 2 and Figure 6 As shown, a motor 311 is fixedly installed on the top of the pump body 21, and the motor 311 is fixedly connected to the rotating shaft 312. An impeller 313 is fixedly installed on the bottom of the rotating shaft 312. The impeller 313 is located inside the pump body 21, and the slide 32 is located above the impeller 313.

[0021] During the high-temperature liquid circulation process, the motor 1 311 is started and drives the impeller 313 to rotate via the rotating shaft 312 , and the impeller 313 transports the high-temperature liquid upward for circulation.

[0022] like Figure 2-Figure 5 and Figure 7 As shown, the outer wall of the slide 32 is integrally formed with a spiral ridge 321, and the inner wall of the pump body 21 is provided with a spiral groove 211 and a slide 214. The slide 214 is located above the spiral groove 211. The slide 214 and the spiral groove 211 are connected to each other, and the spiral ridge 321 is slidably installed inside the spiral groove 211 and the slide 214.

[0023] like Figure 3 、 Figure 4 and Figure 7 As shown, a spring slider 322 is slidably installed inside the slide 32, a second slide groove 315 is provided on the outer wall of the rotating shaft 312, the spring slider 322 is slidably installed inside the second slide groove 315, a flow channel 324 is provided inside the slide 32, and the discharge pipe 1 and the pump body 21 are connected to each other through the flow channel 324.

[0024] When the cam 321 is in the closed position, the piston rod 324 is in the closed position, and the piston rod 326 is in the open position, so that the piston rod 326 is in the open position, and the piston rod 327 is in the open position, so that the piston rod 326 is in the open position, and the piston rod 328 is in the open position, so that the piston rod 328 is in the open position, and the piston rod 329 is in the open position, so that the piston rod 329 is in the open position,

[0025] Further references Figure 2 、 Figure 3 、 Figure 5 and Figure 7 To explain, when the impeller 313 is damaged, the thrust of the high-temperature liquid moving upward decreases, the spring ring 314 is released, and the slide 32 moves downward. At this time, the other impeller 313 rotates, and when the other slide 32 drives the spring ring 314 to contact the trigger switch 213, the opening and closing states of the two electric valves 122 are switched.

[0026] like Figure 3 、 Figure 5 and Figure 8 As shown, a connecting hole 212 is provided at the top of the pump body 21, and a connecting pipe 222 is fixedly installed at the top of the air cavity 22, one end of the connecting pipe 222 is fixedly installed inside the connecting hole 212, and a spring 1 223 and a spring 2 224 are provided between the bottom of the inner wall of the air cavity 22 and the bottom of the piston plate 221, the top and bottom of the spring 1 223 are fixedly connected to the air cavity 22 and the piston plate 221 respectively, the bottom of the spring 224 is fixedly connected to the air cavity 22, the top of the spring 224 conflicts with the piston plate 221, and the elastic force of the spring 224 is greater than the elastic force of the spring 1 223.

[0027] In the process of the slide 32 moving upward, when the flow channel 324 is not connected to the discharge pipe 1, the slide 32 squeezes the air above, so that the air enters the interior of the air cavity 22 through the connecting pipe 222, and the piston plate 221 moves downward and squeezes the spring 1 223. When the flow channel 324 and the discharge pipe 1 are connected to each other, the impeller 313 pushes the air between the valve 1 121 and the slide 32 upward through the upward moving high-temperature liquid, so that the air enters the interior of the air cavity 22, so that the piston plate 221 continues to move downward and resists the spring 2 224. In the process of the slide 32 and the discharge pipe 1 being connected to each other, the piston plate 221 is pressed against the spring 2 224. During the process, when the spiral ridge 321 is located inside the spiral groove 211, the slide 32 rotates to ensure continuous communication between the flow channel 324 and the drain pipe 1. At this time, after the air between the valve 121 and the slide 32 enters the interior of the air cavity 22, the high-temperature liquid continuously enters the interior of the drain pipe 1, and the air between the slide 32 and the drain pipe 1 continuously enters the interior of the air cavity 22. When the spiral ridge 321 is located at the top of the slide groove 214, the slide 32 closes the connecting pipe 222, the internal fluid replenishment of the pump body 21 is completed, the air inside the pump body 21 is all located inside the air cavity 22, and the electric valve 122 is opened.

[0028] Further references Figure 2 and Figure 3 To explain, when the slide 32 moves downward after the impeller 313 is damaged, the slide 32 still closes the connecting pipe 222. When the electric valve 122 and the motor 1 311 are closed, the spring ring 314 pushes the slide 32 downward, so that the connecting pipe 222 opens, the spring 224 is released, and the air cavity 22 instantly discharges the air, causing the high-temperature liquid between the slide 32 and the electric valve 122 to move downward. At this time, the spring ring 314 continues to push the slide 32 downward, causing the slide 32 to rotate, the flow channel 324 and the discharge pipe 1 are separated, the air cavity 22 releases the gas and pushes the slide 32 to move downward, and another impeller 313 extracts the high-temperature liquid inside the pump body 21 of the damaged impeller 313. After the high-temperature liquid inside the pump body 21 is discharged, the valve 121 is manually closed and the pump body 21 is removed.

[0029] The specific working principle and use method of the present invention are explained in detail below: When the impeller 313 inside one of the pump bodies 21 is damaged, the thrust of the high-temperature liquid moving upward decreases, and the slide 32 moves downward. At this time, the motor 1 311 installed above the other pump body 21 is started and drives the impeller 313 to rotate through the rotating shaft 312. The rotating shaft 312 drives the slide 32 to rotate through the spring slider 322 and the slide 2 315. The slide 32 moves upward through the spiral ridge 321 and the spiral groove 211. At this time, the high-temperature liquid inside the liquid inlet pipe 11 is pumped into the interior of the pump body 21, so that the high-temperature liquid is immersed The impeller 313 squeezes the air above at the same time, so that the air enters the air cavity 22 through the connecting pipe 222, and replenishes the pump body 21 through the upward movement of the slide cylinder 32, while discharging the air inside the pump body 21, thereby improving the efficiency of replacing the pump body 21 and avoiding the problem that the high-temperature liquid cannot circulate. When the flow channel 324 and the discharge pipe 1 are connected to each other, the impeller 313 discharges the air below the slide cylinder 32 to the interior of the air cavity 22 through the upward moving high-temperature liquid, further discharging the air inside the pump body 21, and avoiding the existence of air in the high-temperature liquid circulation process. When the spiral rib 321 is located inside the spiral groove 211, the slide 32 rotates, so that the flow channel 324 and the discharge pipe 1 are continuously connected. Through the rotation of the slide 32, the high-temperature liquid continuously enters the inside of the discharge pipe 1, and further discharges the air inside the pump body 21. When the spiral rib 321 is located at the top of the slide groove 214, the slide 32 closes the connecting pipe 222, and the internal fluid replenishment of the pump body 21 is completed. The air inside the pump body 21 is all located inside the air cavity 22. At this time, the opening and closing states of the two electric valves 122 are switched, the damaged impeller 313 stops rotating, and the spring ring 314 pushes the slide 32 downward. The air in the air cavity 22 is instantly discharged. At this time, the high-temperature liquid between the slide 32 and the electric valve 122 moves downward, and the spring ring 314 continues to push the slide 32 downward, causing the slide 32 to rotate, and the flow channel 324 and the discharge pipe 1 are separated. Another impeller 313 extracts the high-temperature liquid inside the pump body 21 that has damaged the impeller 313. The air in the air cavity 22 releases gas and pushes the slide 32 downward, causing the slide 32 to return to its original position. The inner wall of the pump body 21 is cleaned by the downward sliding of the slide 32 to avoid injury to workers during maintenance. After the high-temperature liquid inside the pump body 21 is discharged, the valve 121 is manually closed and the pump body 21 is removed.

[0030] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are common means well known to those skilled in the art.

[0031] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An axial flow high temperature liquid metal circulation pump, comprising a liquid discharge pipe (1), a liquid inlet pipe (11) and two pump bodies (21), characterized in that: The input end and the output end of the two pump bodies (21) are fixedly connected to the liquid inlet pipe (11) and the liquid discharge pipe (1); a liquid infusion component is movably installed inside the pump body (21); the liquid infusion component includes a slide (32) and a rotating shaft (312); the slide (32) is movably installed inside the pump body (21); the rotating shaft (312) is rotatably installed inside the pump body (21); the slide (32) is movably sleeved on the outside of the rotating shaft (312); and a guide plate (323) is integrally formed inside the slide (32); A liquid discharge assembly is movably mounted on the outside of the pump body (21), and the liquid discharge assembly comprises an air cavity (22) and a piston plate (221). The air cavity (22) is fixedly mounted on the outside of the pump body (21), and the piston plate (221) is slidably mounted inside the air cavity (22).

2. The axial flow high-temperature liquid metal circulation pump according to claim 1, characterized in that: A motor 1 (311) is fixedly mounted on the top of the pump body (21), the motor 1 (311) and the rotating shaft (312) are fixedly connected, an impeller (313) is fixedly mounted on the bottom of the rotating shaft (312), the impeller (313) is located inside the pump body (21), and the slide cylinder (32) is located above the impeller (313).

3. The axial flow high temperature liquid metal circulation pump according to claim 1, characterized in that: The outer peripheral wall of the slide (32) is integrally formed with a spiral ridge (321), and the inner wall of the pump body (21) is provided with a spiral groove (211) and a slide groove 1 (214), wherein the slide groove 1 (214) is located above the spiral groove (211), and the slide groove 1 (214) and the spiral groove (211) are connected to each other, and the spiral ridge (321) is slidably installed inside the spiral groove (211) and the slide groove 1 (214).

4. The axial flow high-temperature liquid metal circulation pump according to claim 1, characterized in that: A spring slider (322) is slidably installed inside the slide cylinder (32), a second slide groove (315) is provided on the outer peripheral wall of the rotating shaft (312), the spring slider (322) is slidably installed inside the second slide groove (315), a flow channel (324) is provided inside the slide cylinder (32), and the discharge pipe (1) and the pump body (21) are connected to each other through the flow channel (324).

5. The axial flow high temperature liquid metal circulation pump according to claim 1, characterized in that: A spring ring (314) is provided on the top of the pump body (21), a trigger switch (213) is fixedly mounted on the top of the pump body (21), and the bottoms of the spring ring (314) and the trigger switch (213) both contact the top of the slide cylinder (32).

6. The axial flow high-temperature liquid metal circulation pump according to claim 5, characterized in that: A valve (121) is movably installed at the connection between the liquid inlet pipe (11) and the two pump bodies (21), and an electric valve (122) is movably installed at the connection between the liquid discharge pipe (1) and the two pump bodies (21). The electric valve (122) is controlled by a trigger switch (213).

7. The axial flow high temperature liquid metal circulation pump according to claim 1, characterized in that: A connecting hole (212) is provided at the top of the pump body (21), a connecting pipe (222) is fixedly installed at the top of the air cavity (22), one end of the connecting pipe (222) is fixedly installed inside the connecting hole (212), and a spring 1 (223) and a spring 2 (224) are provided between the bottom of the inner wall of the air cavity (22) and the bottom of the piston plate (221).

8. The axial flow high temperature liquid metal circulation pump according to claim 7, characterized in that: The top and bottom of the spring 1 (223) are fixedly connected to the air cavity (22) and the piston plate (221) respectively, the bottom of the spring 2 (224) is fixedly connected to the air cavity (22), the top of the spring 2 (224) is in conflict with the piston plate (221), and the elastic force of the spring 2 (224) is greater than the elastic force of the spring 1 (223).

Images