CN218761417U - Lead bismuth main pump mechanical seal with zero leakage to environment - Google Patents
Lead bismuth main pump mechanical seal with zero leakage to environment Download PDFInfo
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- CN218761417U CN218761417U CN202223427981.7U CN202223427981U CN218761417U CN 218761417 U CN218761417 U CN 218761417U CN 202223427981 U CN202223427981 U CN 202223427981U CN 218761417 U CN218761417 U CN 218761417U
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Abstract
The utility model provides a lead bismuth main pump mechanical seal to zero leakage of environment, include: the cooling device comprises a shaft sleeve, a sealing cavity, a cooling cavity and a contact type sealing assembly; the shaft sleeve is fixedly arranged on the main shaft, the contact type sealing assembly comprises an upper pair of friction pairs and a lower pair of friction pairs, each pair of friction pairs consists of a moving ring assembly and a static ring assembly, a sealing cavity is filled with sealing liquid with pressure provided by a liquid storage tank, and a snakelike cooling jacket is arranged in the cooling cavity; the sealing liquid in the sealing cavity of the utility model does not flow, does not need a complex mechanical sealing control system, does not need to set a pump effect, and the annular snake-shaped cooling jacket structure increases the heat exchange area through the snake-shaped structure, thereby avoiding the faults of overheating and abrasion and the like; the sealing liquid that upper and lower end seal leakage outlet was collected gets into special leakage liquid collecting tank in, avoids inert gas to sneak into and lets in the atmosphere in letting out leakage liquid, prevents the leakage of radioactive medium, even sealed face damages can not cause the radioactive medium that leads to because of the starving to leak outward yet.
Description
Technical Field
The utility model belongs to the technical field of mechanical seal, especially, lead bismuth main pump mechanical seal to zero leakage of environment.
Background
The mechanical seal of the lead-bismuth pump is positioned at the upper part of the lead-bismuth pump and below the upper bearing. Is a sealing function for maintaining the pump chamber and the external atmosphere.
The mechanical sealing function of the lead bismuth pump is to ensure the sealing of the air cavity of the pump and the external atmosphere when the pump is running or stopped, prevent the radioactive substances in the pump cavity from leaking to the atmosphere and prevent air from entering the pump cavity. Once the mechanical seal cannot perform the above expected functions under the specified working conditions, the mechanical seal has extremely serious influence on a nuclear power operation site, and in a serious condition, the mechanical seal can cause unplanned shutdown. The mechanical seal structure who adopts among the present patent technology adds dry gas seal assembly for axle sleeve, parking sealing ring, and dry gas seal assembly is terminal surface non-contact's sealed, and it leaks the volume great, and this characteristic has just led to sealed the hourglass that needs to consume a large amount of gas and prevent radioactive helium, simultaneously, leaks to have the excessive risk of radioactive gas after the volume increase.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model aims to provide a lead bismuth main pump mechanical seal with zero leakage to the environment.
In order to realize the purpose of the utility model, the utility model discloses technical scheme as follows:
a zero-leakage to the environment lead bismuth main pump mechanical seal, comprising: the shaft sleeve 12, a sealed cavity outside the shaft sleeve 12 and a cooling cavity 4 outside the sealed cavity; a contact seal assembly within the sealed cavity;
the shaft sleeve 12 is fixedly arranged on a main shaft, the main shaft is arranged in a lead-bismuth main pump body, and radioactive inert gas is contained in the lead-bismuth main pump body;
the contact type sealing assembly comprises an upper pair of friction pairs and a lower pair of friction pairs, each pair of friction pairs consists of a movable ring assembly 6 and a fixed ring assembly 7, the lower friction pair consists of an upper friction surface of the fixed ring assembly 7 and a lower friction surface of the movable ring assembly 6 above, the upper friction pair consists of an upper friction surface of the movable ring assembly 6 and a lower friction surface of the fixed ring assembly 7 above, the movable ring assembly 6 is vertically limited on the shaft sleeve 12 through an upper limiting ring 15 and a lower limiting ring 16 and rotates along with the shaft sleeve 12, and the friction surfaces of the fixed ring assembly 7 and the movable ring assembly 6 are tightly attached; the sealing cavity is filled with sealing liquid with pressure provided by a liquid storage tank 13, the left lower side of the sealing cavity is provided with a sealing liquid inlet joint 3 communicated with the sealing cavity, and the right upper side of the sealing cavity is provided with a sealing cavity exhaust joint 14 communicated with the sealing cavity; the sealing liquid inlet joint 3 is communicated with a liquid storage tank 13 through a pipeline;
the cooling cavity 4 is internally provided with: the serpentine cooling jacket 5 comprises a plurality of bending sections connected end to end, and the cooling cavity 4 is provided with cooling liquid; a cooling liquid inlet joint 8 communicated with the cooling cavity 4 is arranged at the left upper side of the cooling cavity 4, and a cooling liquid outlet joint 18 communicated with the cooling cavity 4 is arranged at the right upper side of the cooling cavity 4; the coolant inlet connector 8 is connected with the beginning of the serpentine cooling jacket, and the end of the serpentine cooling jacket is connected with the coolant outlet connector 18.
Preferably, the upper limit ring 15 and the lower limit ring 16 limit the movable ring assembly 6 up and down by a step.
Preferably, the upper left side of the sealed cavity is provided with an upper end sealed leakage outlet 9, the lower right side is provided with a lower end sealed leakage outlet 19, the upper end sealed leakage outlet 9 is communicated with the friction surfaces of the moving ring assembly 6 and the static ring assembly 7 of the upper friction pair, and the lower end sealed leakage outlet 19 is communicated with the friction surfaces of the moving ring assembly 6 and the static ring assembly 7 of the lower friction pair.
Preferably, the upper and lower limiting rings 15 and 16 are fixedly connected by screws 17.
Preferably, the sealing liquid of the sealing cavity is selected from deionized water or oil.
Preferably, the sealing liquid pressure of the sealing cavity is always higher than the pressure of the inert gas in the lead bismuth pump, and the inert gas does not enter the sealing liquid and does not leak into the atmosphere.
Preferably, the cooling cavity 4 and the serpentine cooling jacket 5 are sealed together by welding.
Preferably, a spring 11 is arranged above the static ring assembly 7, and the static ring assembly 7 keeps close contact with the friction surface of the dynamic ring assembly 6 under the spring force of the spring 11.
The working method of the utility model is as follows:
sealing liquid with pressure enters the sealing cavity from the liquid storage tank through the sealing liquid inlet joint 3, and when the liquid is filled, the liquid overflows from the sealing cavity exhaust joint 14 to indicate that all gas in the sealing cavity is exhausted, so that the sealing cavity exhaust joint 14 can be closed; the upper end sealing leakage outlet 9 is a sealing liquid leakage outlet of the upper end friction pair, the lower end sealing leakage outlet 19 is a sealing liquid leakage outlet of the lower end friction pair, and sealing liquid collected by the upper end sealing leakage outlet and the lower end sealing leakage outlet enters a special leakage liquid collecting tank, so that inert gas is prevented from being mixed into the leakage liquid and entering the atmosphere, and leakage of radioactive media is prevented; even if the sealing component is damaged, the radioactive medium cannot leak out due to liquid shortage, and the sealing liquid in the sealing cavity is in a full state because the oil storage tank 13 can supplement the sealing liquid in time;
the sealing liquid enters the sealing cavity and between the upper and lower pairs of friction pairs consisting of the moving ring assembly 6 and the static ring assembly 7, so that the pressure of the sealing liquid is always higher than that of the inert gas in the lead bismuth pump, the inert gas cannot enter the sealing liquid and cannot be leaked into the atmosphere from the sealing liquid, and the safety of radioactive substances of the lead bismuth pump is ensured; the static ring component slides up and down relatively under the action of sealing liquid and spring force, and keeps close fit with the friction surface of the dynamic ring component 6;
snakelike cooling jacket structure 5 has increased heat transfer area through snakelike structure, and the cooling water circulates the back through coolant liquid outlet connection 18 outflow in the middle in the cavity that gets into between cooling chamber 4 and snakelike cooling jacket structure 5 through coolant liquid inlet connection 8, seals through the welding between cooling chamber 4 and the snakelike cooling jacket structure 5, prevents that the coolant liquid from leaking outward.
The utility model has the advantages that: the utility model adopts double-end-face contact type sealing to seal the inert gas in the lead-bismuth pump, and because the sealing liquid in the sealing cavity does not flow, a complex mechanical sealing control system is not needed, only a liquid storage tank which can provide the sealing liquid with pressure is needed to be hung externally, and a pump effect ring is not needed to be arranged; the design has snakelike cooling jacket structure to increase heat transfer area through snakelike structure among the mechanical seal, adopts snakelike cooling jacket to let in the cooling water and carries out the heat exchange, reduces sealed intracavity terminal surface heat, guarantees that sealed operational aspect is good, avoids taking place trouble such as overheated wearing and tearing. The cooling cavity and the snakelike cooling jacket are sealed by welding, so that the leakage of cooling water caused by sealing failure between the cooling cavity and the snakelike cooling jacket is avoided. Even if the sealing assembly is damaged, the radioactive medium cannot leak out due to liquid shortage, and the external oil storage tank can supplement the sealing liquid in time, so that the sealing liquid in the sealing cavity is in a full state; even sealing assembly damages the sealed liquid and leaks in a large number, the sealed liquid that leaks also can be through the sealed leakage exit of upper and lower extreme all smoothly flow in leaking the collecting tank, avoids inert gas to sneak into in the leakage liquid and gets into the atmosphere, the condition that gets into the pump chamber can not appear, has avoided the excessive or internal risk of leaking of radioactive gas fundamentally.
Drawings
Fig. 1 is a schematic view of the mechanical sealing structure of the lead bismuth main pump with zero leakage to the environment;
1 is the sealed cavity of parking, 2 is the lower extreme cover, 3 is a sealing liquid inlet joint, 4 is the cooling cavity, 5 is snakelike cooling jacket, 6 is the rotating ring subassembly, 7 is quiet ring subassembly, 8 is the cooling liquid inlet joint, 9 is the sealed leakage exit in upper end, 10 is axle sleeve O shape circle, 11 is the spring, 12 is the axle sleeve, 13 is the liquid storage pot, 14 is sealed chamber exhaust joint, 15 is last spacing ring, 16 is lower spacing ring, 17 is the screw, 18 is the cooling liquid outlet joint, 19 is the sealed leakage exit in lower extreme.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
As shown in fig. 1, the present embodiment provides a lead bismuth main pump mechanical seal with zero leakage to the environment, which includes: the cooling device comprises a shaft sleeve 12, a sealed cavity outside the shaft sleeve 12 and a cooling cavity 4 outside the sealed cavity; a contact seal assembly within the seal cavity;
the shaft sleeve 12 is fixedly arranged on a main shaft, the main shaft is arranged in a lead-bismuth main pump body, and radioactive inert gas is contained in the lead-bismuth main pump body;
the contact type sealing assembly comprises an upper pair of friction pairs and a lower pair of friction pairs, each pair of friction pairs consists of a movable ring assembly 6 and a fixed ring assembly 7, the lower friction pair consists of an upper friction surface of the fixed ring assembly 7 and a lower friction surface of the movable ring assembly 6 above, the upper friction pair consists of an upper friction surface of the movable ring assembly 6 and a lower friction surface of the fixed ring assembly 7 above, the movable ring assembly 6 is vertically limited on the shaft sleeve 12 through an upper limiting ring 15 and a lower limiting ring 16 and rotates along with the shaft sleeve 12, and the friction surfaces of the fixed ring assembly 7 and the movable ring assembly 6 are tightly attached; the sealing cavity is filled with sealing liquid with pressure provided by a liquid storage tank 13, the left lower side of the sealing cavity is provided with a sealing liquid inlet joint 3 communicated with the sealing cavity, and the right upper side of the sealing cavity is provided with a sealing cavity exhaust joint 14 communicated with the sealing cavity; the sealing liquid inlet joint 3 is communicated with a liquid storage tank 13 through a pipeline;
the cooling cavity 4 is internally provided with: the serpentine cooling jacket 5 comprises a plurality of bending sections connected end to end, and the cooling cavity 4 is provided with cooling liquid; a cooling liquid inlet joint 8 communicated with the cooling cavity 4 is arranged at the left upper side of the cooling cavity 4, and a cooling liquid outlet joint 18 communicated with the cooling cavity 4 is arranged at the right upper side of the cooling cavity 4; the coolant inlet connector 8 is connected with the beginning of the serpentine cooling jacket, and the end of the serpentine cooling jacket is connected with the coolant outlet connector 18.
In some embodiments, the upper and lower limiting rings 15 and 16 limit the movable ring assembly 6 up and down by steps.
In some embodiments, the upper left side of the sealed cavity is provided with an upper end sealed leakage outlet 9, the lower right side is provided with a lower end sealed leakage outlet 19, the upper end sealed leakage outlet 9 is communicated to the friction surfaces of the movable ring assembly 6 and the static ring assembly 7 of the upper friction pair, and the lower end sealed leakage outlet 19 is communicated to the friction surfaces of the movable ring assembly 6 and the static ring assembly 7 of the lower friction pair.
In some embodiments, the upper and lower limiting rings 15, 16 are fixedly connected by screws 17.
In some embodiments, the sealing fluid of the sealed chamber is selected from deionized water or oil.
In some embodiments, the pressure of the sealing liquid in the sealing cavity is always higher than that of the inert gas in the lead bismuth pump, and the inert gas does not enter the sealing liquid and does not leak into the atmosphere.
In some embodiments, the cooling cavity 4 and the serpentine cooling jacket 5 are sealed together by welding.
In some embodiments, a spring 11 is arranged above the static ring assembly 7, and the static ring assembly 7 is kept in close fit with the friction surface of the dynamic ring assembly 6 under the spring force of the spring 11.
The sealing liquid inlet joint 3 is connected on the lower end cover 2, and the parking sealing cavity 1 is arranged below the sealing liquid inlet joint.
The working method of the embodiment comprises the following steps:
the inert gas in the lead-bismuth pump is sealed by adopting contact type sealing assemblies of an upper friction pair and a lower friction pair consisting of a moving ring assembly 6 and a static ring assembly 7;
sealing liquid with pressure enters the sealing cavity from the liquid storage tank 13 through the sealing liquid inlet joint 3, and when the liquid is filled, the liquid overflows from the sealing cavity exhaust joint 14 to indicate that all gas in the sealing cavity is exhausted, so that the sealing cavity exhaust joint 14 can be closed; the upper end sealing leakage outlet 9 is a sealing liquid leakage outlet of the upper end friction pair, the lower end sealing leakage outlet 19 is a sealing liquid leakage outlet of the lower end friction pair, and sealing liquid collected by the upper end sealing leakage outlet and the lower end sealing leakage outlet enters a special leakage liquid collecting tank, so that inert gas is prevented from being mixed into the leakage liquid and entering the atmosphere, and leakage of radioactive media is prevented; even if the sealing assembly is damaged, the radioactive medium cannot leak due to liquid shortage, and the sealing liquid in the sealing cavity is in a full state because the sealing liquid can be supplemented in time by the oil storage tank 13;
the sealing liquid enters the sealing cavity and between the upper and lower pairs of friction pairs consisting of the moving ring assembly 6 and the static ring assembly 7, so that the pressure of the sealing liquid is always higher than that of the inert gas in the lead bismuth pump, the inert gas cannot enter the sealing liquid and cannot be leaked into the atmosphere from the sealing liquid, and the safety of radioactive substances of the lead bismuth pump is ensured; the static ring component slides up and down relatively under the action of sealing liquid and spring force, and keeps close fit with the friction surface of the dynamic ring component 6;
snakelike cooling jacket structure 5 has increased heat transfer area through snakelike structure, and the cooling water circulates the back through coolant liquid outlet connection 18 outflow in the middle in the cavity that gets into between cooling chamber 4 and snakelike cooling jacket structure 5 through coolant liquid inlet connection 8, seals through the welding between cooling chamber 4 and the snakelike cooling jacket structure 5, prevents that the coolant liquid from leaking outward.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A lead bismuth main pump mechanical seal with zero leakage to the environment is characterized by comprising: the cooling device comprises a shaft sleeve (12), a sealed cavity body outside the shaft sleeve (12) and a cooling cavity body (4) outside the sealed cavity body; a contact seal assembly within the sealed cavity;
the shaft sleeve (12) is fixedly arranged on a main shaft, the main shaft is arranged in a lead bismuth main pump body, and the lead bismuth main pump body is internally provided with inert gas with radioactivity;
the contact type sealing assembly comprises an upper pair of friction pairs and a lower pair of friction pairs, each pair of friction pairs consists of a movable ring assembly (6) and a fixed ring assembly (7), the lower friction pair consists of an upper friction surface of the fixed ring assembly (7) and a lower friction surface of the movable ring assembly (6) above, the upper friction pair consists of an upper friction surface of the movable ring assembly (6) and a lower friction surface of the fixed ring assembly (7) above, the movable ring assembly (6) is vertically limited on the shaft sleeve (12) through an upper limiting ring (15) and a lower limiting ring (16) and rotates together with the shaft sleeve (12), and the friction surfaces of the fixed ring assembly (7) and the movable ring assembly (6) are tightly attached; the sealing cavity is filled with sealing liquid with pressure provided by a liquid storage tank (13), the left lower side of the sealing cavity is provided with a sealing liquid inlet joint (3) communicated with the sealing cavity, and the right upper side of the sealing cavity is provided with a sealing cavity exhaust joint (14) communicated with the sealing cavity; the sealing liquid inlet joint (3) is communicated with the liquid storage tank (13) through a pipeline;
the cooling cavity (4) is internally provided with: the snakelike cooling jacket (5) comprises a plurality of bending sections which are connected end to end, and the cooling cavity (4) is provided with cooling liquid; a cooling liquid inlet joint (8) communicated with the cooling cavity (4) is arranged at the left upper side of the cooling cavity (4), and a cooling liquid outlet joint (18) communicated with the cooling cavity (4) is arranged at the right upper side of the cooling cavity; the cooling liquid inlet joint (8) is connected with the initial end of the serpentine cooling jacket, and the tail end of the serpentine cooling jacket is connected with the cooling liquid outlet joint (18).
2. The lead bismuth main pump mechanical seal with zero leakage to the environment of claim 1, characterized in that: the upper limiting ring (15) and the lower limiting ring (16) limit the movable ring component (6) up and down through steps.
3. The lead bismuth main pump mechanical seal with zero leakage to the environment of claim 1, characterized in that: the left upper side of the seal cavity is provided with an upper end seal leakage outlet (9), the right lower side is provided with a lower end seal leakage outlet (19), the upper end seal leakage outlet (9) is communicated to the friction surfaces of the movable ring component (6) and the static ring component (7) of the upper friction pair, and the lower end seal leakage outlet (19) is communicated to the friction surfaces of the movable ring component (6) and the static ring component (7) of the lower friction pair.
4. The lead bismuth main pump mechanical seal with zero leakage to the environment of claim 1, characterized in that: the upper limiting ring (15) and the lower limiting ring (16) are fixedly connected through a screw (17).
5. The lead bismuth main pump mechanical seal with zero leakage to the environment of claim 1, characterized in that: the sealing liquid of the sealing cavity is selected from deionized water or oil.
6. The lead bismuth main pump mechanical seal with zero leakage to the environment of claim 1, characterized in that: the pressure of the sealing liquid in the sealing cavity is always higher than that of the inert gas in the lead bismuth pump, and the inert gas does not enter the sealing liquid and does not leak into the atmosphere.
7. The lead bismuth main pump mechanical seal with zero leakage to the environment of claim 1, characterized in that: the cooling cavity (4) and the serpentine cooling jacket (5) are sealed together by welding.
8. The lead bismuth main pump mechanical seal with zero leakage to the environment of claim 1, characterized in that: a spring (11) is arranged above the static ring component (7), and the static ring component (7) is kept to be tightly attached to the friction surface of the dynamic ring component (6) under the spring force action of the spring (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223427981.7U CN218761417U (en) | 2022-12-21 | 2022-12-21 | Lead bismuth main pump mechanical seal with zero leakage to environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223427981.7U CN218761417U (en) | 2022-12-21 | 2022-12-21 | Lead bismuth main pump mechanical seal with zero leakage to environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218761417U true CN218761417U (en) | 2023-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223427981.7U Active CN218761417U (en) | 2022-12-21 | 2022-12-21 | Lead bismuth main pump mechanical seal with zero leakage to environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218761417U (en) |
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2022
- 2022-12-21 CN CN202223427981.7U patent/CN218761417U/en active Active
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