Axial flow high temperature liquid metal circulating pump

Abstract

The application 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 discharge pipe, a liquid inlet pipe and two pump bodies, the input end and the output end of the two pump bodies are fixedly connected with the liquid inlet pipe and the liquid discharge pipe, a liquid supplementing assembly is movably arranged in the pump body, the liquid supplementing assembly comprises a sliding cylinder and a rotating shaft, and the sliding cylinder is movably arranged in the pump body. The pump body is supplemented with liquid through the upward movement of the sliding cylinder, the gas in the pump body is discharged, the efficiency of replacing the pump body is improved, the high-temperature liquid continuously enters the inside of the liquid discharge pipe through the rotation of the sliding cylinder, the gas in the pump body is further discharged, the high-temperature liquid in the pump body is discharged through the downward movement of the sliding cylinder, the pump body is cleaned, workers are prevented from being hurt during maintenance, the damaged impeller can be effectively disassembled without stopping the circulation through the switching between the two pump bodies, and the efficiency of the liquid metal cooled reactor system is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of axial flow pumps, and particularly relates to an axial flow high-temperature liquid metal circulating pump. BACKGROUND

[0002] The high-temperature liquid metal circulating pump is a core operating device of a fourth-generation liquid metal cooled reactor system such as a lead-cooled fast reactor, and the performance of the high-temperature liquid metal circulating pump directly determines the thermal safety, operating stability and economy of the advanced nuclear energy system. The liquid metal coolant usually has physical properties such as high temperature, high flow rate, high density and strong corrosiveness, and the axial flow centrifugal pump can effectively circulate and transport high-temperature lead-bismuth, molten salt and other liquids between different devices and process sections. In the reactor, the axial flow pump can continuously circulate the high-temperature materials participating in the reaction to maintain the uniformity of the temperature and concentration in the reaction system, thereby promoting the full circulation. However, in the long-term operation process of circulating high-temperature liquids, the pump body and impeller and other components may be subjected to phenomena such as creep and thermal fatigue, corrosion, abrasion and the like, and are accompanied by problems such as large system vibration and noise, low reliability and the like, which makes it necessary to disassemble and replace the damaged axial flow pump. However, the temperature of the high-temperature liquid is usually much higher than that at room temperature, and improper handling during disassembly can easily cause burns to the operator. Moreover, the circulation of the high-temperature liquid needs to be stopped during disassembly, which greatly affects the efficiency of the fourth-generation liquid metal cooled reactor system such as the lead-cooled fast reactor. After replacing the new axial flow pump, not only the pump body needs to be replenished with liquid, but also the air inside the pump body needs to be discharged (under the high-temperature and high-density liquid metal flow condition, the fluctuation of the oxygen concentration in the liquid lead-bismuth alloy has a significant influence on the material corrosion and abrasion behavior of the axial flow pump). Not only is the operation complicated and affects the replacement efficiency, but the air also enters the circulating system and affects the stability of the high-temperature liquid circulation. SUMMARY

[0003] The present application aims at solving the problems in the background art, and provides an axial flow high-temperature liquid metal circulating pump.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] An axial flow high-temperature liquid metal circulating pump, comprising a liquid discharge pipe, a liquid inlet pipe and two pump bodies, the input end and the output end of the two pump bodies are fixedly connected with the liquid inlet pipe and the liquid discharge pipe, a liquid replenishing assembly is movably installed in the interior of the pump body, the liquid replenishing assembly comprises a sliding cylinder and a rotating shaft, the sliding cylinder is movably installed in the interior of the pump body, the rotating shaft is rotatably installed in the interior of the pump body, the sliding cylinder is movably sleeved on the outer side of the rotating shaft, and a guide plate is integrally formed in the interior of the sliding cylinder.

[0006] The outer side of the pump body is movably provided with a liquid discharge assembly, the liquid discharge assembly comprises an air cavity and a piston plate, the air cavity is fixedly arranged on the outer side of the pump body, and the piston plate is slidably arranged in the air cavity.

[0007] In the axial flow type high-temperature liquid metal circulating pump, the top of the pump body is fixedly provided with a motor one, the motor one is fixedly connected with the rotating shaft, the bottom of the rotating shaft is fixedly provided with an impeller, the impeller is arranged in the pump body, and the sliding cylinder is arranged above the impeller.

[0008] In the axial flow type high-temperature liquid metal circulating pump, the outer peripheral wall of the sliding cylinder is integrally provided with a spiral convex strip, the inner wall of the pump body is provided with a spiral groove and a sliding groove one, the sliding groove one is arranged above the spiral groove, the sliding groove one and the spiral groove are in communication with each other, and the spiral convex strip is slidably arranged in the spiral groove and the sliding groove one.

[0009] In the axial flow type high-temperature liquid metal circulating pump, the inside of the sliding cylinder is slidably provided with a spring sliding block, the outer peripheral wall of the rotating shaft is provided with a sliding groove two, the spring sliding block is slidably arranged in the sliding groove two, the inside of the sliding cylinder is provided with a flow channel, and the liquid discharge pipe and the pump body are in communication through the flow channel.

[0010] In the axial flow type high-temperature liquid metal circulating pump, the top of the pump body is provided with a spring ring, the top of the pump body is fixedly provided with a trigger switch, and the bottom of the spring ring and the bottom of the trigger switch are in abutment with the top of the sliding cylinder.

[0011] In the axial flow type high-temperature liquid metal circulating pump, the connecting portion between the liquid inlet pipe and the two pump bodies is movably provided with a valve one, the connecting portion between the liquid discharge pipe and the two pump bodies is movably provided with an electric valve, and the electric valve is controlled through the trigger switch.

[0012] In the axial flow type high-temperature liquid metal circulating pump, the top of the pump body is provided with a connecting hole, the top of the air cavity is fixedly provided with a connecting pipe, one end of the connecting pipe is fixedly arranged in the connecting hole, and the bottom of the inner wall of the air cavity and the bottom of the piston plate are provided with a spring one and a spring two.

[0013] In the axial flow type high-temperature liquid metal circulating pump, the top and the bottom of the spring one are fixedly connected with the air cavity and the piston plate respectively, the bottom of the spring two is fixedly connected with the air cavity, the top of the spring two is in abutment with the piston plate, and the elastic force of the spring two is greater than that of the spring one.

[0014] Compared with the prior art, the axial flow type high-temperature liquid metal circulating pump has the advantages that:

[0015] Compared with the prior art, the axial flow type high-temperature liquid metal circulating pump has the advantages that:The pump body is internally movably installed with a sliding cylinder, so that when the motor starts, the sliding cylinder rotates and moves upward, the pump body is supplemented with liquid through the upward movement of the sliding cylinder, and the air inside the pump body is discharged, improving the efficiency of replacing the pump body, avoiding the problem that high-temperature liquid cannot circulate, the high-temperature liquid is driven by the impeller to move upward, so that the air below the sliding cylinder is discharged to the inside of the air cavity, further discharging the air inside the pump body, avoiding the influence of air on the stability of high-temperature liquid circulation in the circulating system, in the process that the sliding cylinder and the liquid discharge pipe are communicated with each other, the continuous communication between the flow channel and the liquid discharge pipe is realized through the rotation of the sliding cylinder, the high-temperature liquid continuously enters the inside of the liquid discharge pipe, further discharging the air inside the pump body, avoiding the problem of air in the high-temperature liquid circulation process, when the motor is turned off, the air cavity releases air through the downward movement of the sliding cylinder, discharges the high-temperature liquid inside the pump body, and cleans the inner wall of the pump body, avoiding the injury of workers during maintenance, through the switching between the two pump bodies, the damaged impeller can be effectively disassembled without stopping circulation, ensuring the efficiency of the liquid metal cooled reactor system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic diagram of the present application;

[0017] Figure 2 It is a whole structure sectional view of the present application;

[0018] Figure 3 It is an enlarged schematic diagram of A in the present application; Figure 2

[0019] Figure 4 It is an enlarged schematic diagram of B in the present application; Figure 2

[0020] Figure 5 It is a structure sectional view of the pump body in the present application;

[0021] Figure 6 It is a structure schematic diagram of the rotating shaft in the present application;

[0022] Figure 7 It is a disassembly schematic diagram of the sliding cylinder in the present application;

[0023] Figure 8 It is a disassembly schematic diagram of the liquid discharge assembly in the present application.

[0024] ​​In the diagram: 1. Drain pipe; 11. Inlet pipe; 121. Valve 1; 122. Electric valve; 21. Pump body; 211. Spiral groove; 212. Connecting hole; 213. Trigger switch; 214. Slide groove 1; 22. Air chamber; 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 groove 2; 32. Slide cylinder; 321. Spiral protrusion; 322. Spring slider; 323. Guide plate; 324. Flow channel. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Reference Figure 1 - Figure 8 As shown, an axial flow high-temperature liquid metal circulating pump includes a drain pipe 1, an inlet pipe 11, and two pump bodies 21. The input and output ends of the two pump bodies 21 are fixedly connected to the inlet pipe 11 and the drain pipe 1. A replenishment assembly is movably installed inside the pump body 21. The replenishment assembly includes a slide cylinder 32 and a rotating shaft 312. The slide cylinder 32 is movably installed inside the pump body 21, and the rotating shaft 312 is rotatably installed inside the pump body 21. The slide cylinder 32 is movably sleeved on the outside of the rotating shaft 312. A guide plate 323 is integrally formed inside the slide cylinder 32.

[0028] A drain assembly is movably installed on the outside of the pump body 21. The drain assembly includes an air chamber 22 and a piston plate 221. The air chamber 22 is fixedly installed on the outside of the pump body 21, and the piston plate 221 is slidably installed inside the air chamber 22.

[0029] like Figure 2 and Figure 3As shown in

[0030] When one of the impellers 313 inside the pump body 21 is damaged, the motor one 311 installed above the other pump body 21 is started and drives the impeller 313 to rotate, the electric valve 122 is in a normally closed state, and the valve one 121 is in a normally open state. When the slide cylinder 32 drives the spring ring 314 to abut against the trigger switch 213, the electric valve 122 close to the damaged impeller 313 is closed, and the other electric valve 122 is opened, the pump body 21 is connected with the liquid discharge pipe 1, at this time, the motor one 311 above the pump body 21 whose impeller 313 is damaged is closed, and the corresponding valve one 121 is closed when the pump body 21 is disassembled.

[0031] As shown in Figure 2 and Figure 6 The top of the pump body 21 is fixedly installed with the motor one 311, the motor one 311 is fixedly connected with the rotating shaft 312, and the bottom of the rotating shaft 312 is fixedly installed with the impeller 313. The impeller 313 is located inside the pump body 21, and the slide cylinder 32 is located above the impeller 313.

[0032] In the process of circulating the high-temperature liquid, the motor one 311 is started and drives the impeller 313 to rotate through the rotating shaft 312, and the impeller 313 upwardly transports the high-temperature liquid for circulation.

[0033] As shown in Figures 2-5 and Figure 7 The outer peripheral wall of the slide cylinder 32 is integrally formed with the spiral protrusions 321, the inner wall of the pump body 21 is provided with the spiral groove 211 and the sliding groove one 214, the sliding groove one 214 is located above the spiral groove 211, the sliding groove one 214 and the spiral groove 211 are in communication with each other, and the spiral protrusions 321 are slidably installed inside the spiral groove 211 and the sliding groove one 214.

[0034] As shown in Figure 3 , Figure 4 and Figure 7 The spring sliding block 322 is slidably installed inside the slide cylinder 32, the outer peripheral wall of the rotating shaft 312 is provided with the sliding groove two 315, the spring sliding block 322 is slidably installed inside the sliding groove two 315, the inner portion of the slide cylinder 32 is provided with the flow channel 324, and the liquid discharge pipe 1 and the pump body 21 are in communication with each other through the flow channel 324.

[0035] ​Wherein, in the process of rotating the rotating shaft 312, the rotating shaft 312 drives the sliding cylinder 32 to rotate through the spring sliding block 322 and the sliding groove two 315, the sliding cylinder 32 moves upward through the spiral convex strip 321 and the spiral groove 211, at this time the sliding cylinder 32 draws the high-temperature liquid in the liquid inlet pipe 11 into the inside of the pump body 21, when the high-temperature liquid immerses the impeller 313, the impeller 313 transports the high-temperature liquid upward by rotating, when the spiral convex strip 321 of the sliding cylinder 32 moves to the inside of the sliding groove one 214, the flow channel 324 and the liquid outlet pipe 1 are communicated with each other, the sliding groove two 315 abuts against the side wall of the spring sliding block 322, the spring sliding block 322 contracts, at this time the high-temperature liquid moving upward pushes the sliding cylinder 32, so that the sliding cylinder 32 moves upward and drives the spring ring 314 to abut against the trigger switch 213, the electric valve 122 is opened, at this time the spiral convex strip 321 abuts against the top of the sliding groove one 214.

[0036] Further reference is made to Figure 2 、 Figure 3 、 Figure 5 and Figure 7 , when the impeller 313 is damaged, the upward moving high-temperature liquid thrust force decreases, the spring ring 314 is released, the sliding cylinder 32 moves downward, at this time another impeller 313 rotates, when the spring ring 314 driven by another sliding cylinder 32 abuts against the trigger switch 213, the two electric valves 122 switch the opening and closing states.

[0037] As shown in Figure 3 、 Figure 5 and Figure 8 , the top of the pump body 21 is provided with a connecting hole 212, the top of the air cavity 22 is fixedly installed with a connecting pipe 222, one end of the connecting pipe 222 is fixedly installed in the inside of the connecting hole 212, the bottom of the inner wall of the air cavity 22 and the bottom of the piston plate 221 are provided with a spring one 223 and a spring two 224, the top and bottom of the spring one 223 are fixedly connected with the air cavity 22 and the piston plate 221 respectively, the bottom of the spring two 224 is fixedly connected with the air cavity 22, the top of the spring two 224 abuts against the piston plate 221, the elastic force of the spring two 224 is greater than that of the spring one 223.

[0038] Wherein, in the process of the slide cylinder 32 moving upward, when the flow channel 324 is not in communication with the drain pipe 1, the slide cylinder 32 squeezes the air above, so that the air enters the inside of the air cavity 22 through the connecting pipe 222, the piston plate 221 moves downward and squeezes the spring one 223, when the flow channel 324 and the drain pipe 1 are in communication, the impeller 313 pushes the air between the valve one 121 and the slide cylinder 32 upward by the high-temperature liquid moving upward, so that the air enters the inside of the air cavity 22, so that the piston plate 221 continues to move downward and abuts against the spring two 224, in the process of the slide cylinder 32 and the drain pipe 1 being in communication, when the helical convex strip 321 is located inside the helical groove 211, the slide cylinder 32 rotates, so that the flow channel 324 and the drain pipe 1 are continuously in communication, at this time, after the air between the valve one 121 and the slide cylinder 32 enters the inside of the air cavity 22, the high-temperature liquid continuously enters the inside of the drain pipe 1, the air between the slide cylinder 32 and the drain pipe 1 continuously enters the inside of the air cavity 22, when the helical convex strip 321 is located at the top of the slide groove one 214, the slide cylinder 32 closes the connecting pipe 222, the liquid supplement in the inside of the pump body 21 is completed, the air in the inside of the pump body 21 is located in the inside of the air cavity 22, and the electric valve 122 is opened.

[0039] Further referring to Figure 2 and Figure 3 It is explained that, when the slide cylinder 32 moves downward after the impeller 313 is damaged, the slide cylinder 32 still closes the connecting pipe 222, when the electric valve 122 and the electric motor one 311 are closed, the spring ring 314 pushes the slide cylinder 32 downward, so that the connecting pipe 222 is opened, the spring two 224 is released, the air cavity 22 instantaneously discharges the air, so that the high-temperature liquid between the slide cylinder 32 and the electric valve 122 moves downward, at this time, the spring ring 314 continues to push the slide cylinder 32 downward, so that the slide cylinder 32 rotates, the flow channel 324 and the drain pipe 1 are separated, the air cavity 22 releases the gas and pushes the slide cylinder 32 to move downward, in addition, the other impeller 313 extracts the high-temperature liquid in the inside of the pump body 21 of the damaged impeller 313, after the high-temperature liquid in the inside of the pump body 21 is discharged, the valve one 121 is manually closed and the pump body 21 is removed.

[0040] The specific working principle and use method of the application are explained in detail as follows: when the impeller 313 in one of the pump bodies 21 is damaged, the upward movement of the high-temperature liquid thrust is reduced, the sliding cylinder 32 moves downward, the motor 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 sliding cylinder 32 to rotate through the spring sliding block 322 and the sliding groove 315, the sliding cylinder 32 moves upward through the spiral convex strip 321 and the spiral groove 211, at this time, the high-temperature liquid in the liquid inlet pipe 11 is sucked into the inside of the pump body 21, so that the high-temperature liquid immerses the impeller 313, and at the same time, the air above is extruded to enter the inside of the air cavity 22 through the connecting pipe 222, the sliding cylinder 32 moves upward to supplement the liquid in the pump body 21, and at the same time, the air in the pump body 21 is discharged, so that the efficiency of replacing the pump body 21 is improved, and the problem that the high-temperature liquid cannot circulate is avoided, when the flow channel 324 and the liquid discharge pipe 1 are connected with each other, the impeller 313 drives the air below the sliding cylinder 32 to be discharged into the inside of the air cavity 22 through the upward movement of the high-temperature liquid, and the air in the pump body 21 is further discharged, so that the air exists in the process of circulating the high-temperature liquid is avoided, when the sliding cylinder 32 and the liquid discharge pipe 1 are connected with each other, when the spiral convex strip 321 is located in the inside of the spiral groove 211, the sliding cylinder 32 rotates to continuously connect the flow channel 324 and the liquid discharge pipe 1, through the rotation of the sliding cylinder 32, the high-temperature liquid continuously enters the inside of the liquid discharge pipe 1, and the air in the pump body 21 is further discharged, when the spiral convex strip 321 is located at the top of the sliding groove 214, the sliding cylinder 32 closes the connecting pipe 222, the liquid supplement in the pump body 21 is completed, the air in the pump body 21 is located in the inside of 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, the spring ring 314 pushes the sliding cylinder 32 downward, so that the air in the air cavity 22 is instantaneously discharged, at this time, the high-temperature liquid between the sliding cylinder 32 and the electric valve 122 moves downward, the spring ring 314 continues to push the sliding cylinder 32 downward, so that the sliding cylinder 32 rotates, the flow channel 324 and the liquid discharge pipe 1 are separated, the other impeller 313 extracts the high-temperature liquid in the pump body 21 of the damaged impeller 313, the air cavity 22 releases the gas and pushes the sliding cylinder 32 to move downward, so that the sliding cylinder 32 is reset, the inner wall of the pump body 21 is cleaned through the downward sliding of the sliding cylinder 32, so that the workers are prevented from being injured during maintenance, after the high-temperature liquid in the pump body 21 is discharged, the valve 121 is manually closed and the pump body 21 is removed.

[0041] Further, the fixed connection should be understood in a broad sense unless otherwise specified and limited, for example, it can be welding, or gluing, or integrally formed, and the like.

[0042] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An axial-flow high-temperature liquid metal circulating pump, comprising a drain pipe (1), an inlet pipe (11), and two pump bodies (21), characterized in that: The input and output ends of the two pump bodies (21) are fixedly connected to the inlet pipe (11) and the outlet pipe (1). A replenishment assembly is movably installed inside the pump body (21). The replenishment assembly includes a slide cylinder (32) and a rotating shaft (312). The slide cylinder (32) is movably installed inside the pump body (21). The rotating shaft (312) is rotatably installed inside the pump body (21). The slide cylinder (32) is movably sleeved on the outside of the rotating shaft (312). A guide plate (323) is integrally formed inside the slide cylinder (32). A drain assembly is movably installed on the outside of the pump body (21). The drain assembly includes an air chamber (22) and a piston plate (221). The air chamber (22) is fixedly installed on the outside of the pump body (21), and the piston plate (221) is slidably installed inside the air chamber (22).

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

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

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

5. The axial flow high-temperature liquid metal circulating pump according to claim 1, characterized in that: The pump body (21) is provided with a spring ring (314) at the top, 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) are both in contact with the top of the slide (32).

6. The axial flow high-temperature liquid metal circulating pump according to claim 5, characterized in that: A valve (121) is movably installed at the connection between the inlet pipe (11) and the two pump bodies (21), and an electric valve (122) is movably installed at the connection between the outlet 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 circulating pump according to claim 1, characterized in that: The pump body (21) has a connection hole (212) at the top. A connecting pipe (222) is fixedly installed at the top of the air chamber (22). One end of the connecting pipe (222) is fixedly installed inside the connection hole (212). A spring one (223) and a spring two (224) are provided between the bottom of the inner wall of the air chamber (22) and the bottom of the piston plate (221).

8. The axial flow high-temperature liquid metal circulating pump according to claim 7, characterized in that: The top and bottom of the first spring (223) are fixedly connected to the air chamber (22) and the piston plate (221) respectively. The bottom of the second spring (224) is fixedly connected to the air chamber (22). The top of the second spring (224) abuts against the piston plate (221). The elastic force of the second spring (224) is greater than that of the first spring (223).

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