CN114215919B - Can show novel nuclear main pump static pressure bearing seal structure that improves stability - Google Patents
Can show novel nuclear main pump static pressure bearing seal structure that improves stability Download PDFInfo
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- CN114215919B CN114215919B CN202111556717.0A CN202111556717A CN114215919B CN 114215919 B CN114215919 B CN 114215919B CN 202111556717 A CN202111556717 A CN 202111556717A CN 114215919 B CN114215919 B CN 114215919B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
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Abstract
The utility model relates to a can show novel nuclear main pump static pressure bearing seal structure that improves stability, including rotatory seal assembly and fixed seal assembly, rotatory seal assembly and fixed seal assembly all include the mount pad, sealing ring and clamping ring, the sealing ring of rotatory seal assembly and the sealing ring of fixed seal assembly are mutually supported and are connected together, the ring is provided with the first sealing member that is used for supplying the sealing ring butt on the mount pad to, the clamping ring is used for simultaneously and sealing ring and mount pad butt, be provided with on the clamping ring and be used for fixing the clamping ring on the mount pad in order to drive the sealing ring to support and connect to the installed part on the first sealing member, when the installed part fixes the clamping ring to the butt on the mount pad, leave the constant pressure clearance between sealing ring and the mount pad; this application has the maintenance of being convenient for and improves the advantage of overall performance stability.
Description
Technical Field
The application relates to the field of shaft sealing, in particular to a novel static-pressure shaft seal structure of a nuclear main pump, which can obviously improve the stability.
Background
RCP is a short for reactor coolant system in nuclear power plant system, which is also called primary loop system; the RCP main pump is used for driving a coolant of a primary circuit of a reactor of the nuclear power station and bringing out heat energy for power generation; the main pump shaft seal is one of key parts on the RCP main pump and is a barrier for radioactive media to escape to the environment; at present, a main pump shaft seal of a nuclear power station of a running water reactor mainly comprises a static pressure shaft seal and a dynamic pressure shaft seal; the existing main pump shaft seal structure of the domestic nuclear power station generally uses a shaft seal structure imported from abroad, the shaft seal sealing structure comprises a pressing ring, a mounting seat and other parts, when the sealing inside the main pump runs for a long time, attachments are arranged on the surfaces of the parts, a sealing assembly needs to be disassembled, cleaned and reassembled, or a new spare part needs to be disassembled, inspected and reassembled before being installed, but when the rotating sealing assembly and the fixed sealing assembly are assembled, the requirement is extremely high, the sealing performance after reassembly is caused, the performance of leaving a factory is difficult to achieve, meanwhile, a supplier also automatically disassembles a user, the performance of the assembled sealing assembly is not guaranteed, the whole main pump shaft seal structure is generally required to be returned to the factory to abroad for maintenance, and the main pump shaft seal structure is troublesome.
Disclosure of Invention
In order to facilitate the maintenance of the main pump static pressure shaft seal structure, the application provides a can show the novel nuclear main pump static pressure shaft seal structure who improves stability.
The application provides a can show novel nuclear main pump static pressure bearing seal structure that improves stability adopts following technical scheme:
the utility model provides a can show novel nuclear main pump static pressure bearing seal structure who improves stability, includes rotary seal subassembly and fixed seal subassembly, rotary seal subassembly and fixed seal subassembly all include mount pad, sealing ring and clamping ring, rotary seal subassembly's mount pad is used for the hoop to set up on the main shaft of main pump and follows the synchronous rotation of main shaft, fixed seal subassembly's mount pad is used for the hoop to set up in the seal shell of main pump, rotary seal subassembly's sealing ring and fixed seal subassembly's sealing ring each other butt joint to be in the same place, the mount pad is fitted with a contraceptive ring to being provided with the first sealing member that is used for supplying the sealing ring butt, the clamping ring is used for simultaneously with sealing ring and mount pad butt, be provided with on the clamping ring and be used for fixing the clamping ring to drive the installed part that the sealing ring butt jointed to first sealing member on the mount pad, leave the weighing apparatus clearance when the installed part is fixed to the butt on the mount pad, between sealing ring and the mount pad.
By adopting the technical scheme, the pressing ring can be driven to be directly abutted against the mounting seat through the mounting piece, a constant pressure gap is reserved between the sealing ring and the mounting seat, the stability of the fixed sealing assembly and the rotary sealing assembly is improved, the arrangement that the pressing ring is directly abutted against the mounting seat through the mounting piece is convenient for an operator to directly maintain, the fixed sealing assembly and the rotary sealing assembly do not need to be returned to a factory to be maintained abroad, and the device is convenient and simple; the sealing medium conveyed between the two sealing rings exerts pressure towards the mounting seat on the two sealing rings, part of the sealing medium leaks through a gap between the two sealing rings and flows into a gap between the sealing rings and the main shaft, at the moment, the leaked liquid can enter a constant-pressure gap, pressure is exerted on two sides of each sealing ring, the sealing rings are enabled to reach a pressure balance state, the phenomenon that the sealing rings are damaged due to unbalanced pressure in a high-temperature environment is avoided, generally, a sealing structure in the main pump is multi-stage sealing, if the sealing rings are damaged, the leakage quantity of a first-stage sealing end face is increased abnormally, the pressure of a first-stage sealing cavity is reduced, the pressure of a second-stage sealing is increased, and when the pressure of the first-stage sealing cavity is smaller than the pressure of a coolant of a pump cavity of the main pump, a loop coolant enters the sealing cavity, and the risk of nuclear leakage is caused.
Optionally, a first constant pressure groove is axially formed in the mounting seats of the rotary sealing assembly and the fixed sealing assembly, the first constant pressure groove is located on one side, away from the main shaft, of the first sealing element, and a plurality of conveying holes used for guiding the sealing liquid conveyed to the space between the sealing shell and the main shaft to the first constant pressure groove are formed in the circumferential positions of the compression rings on the compression rings of the rotary sealing assembly and the fixed sealing assembly.
Through adopting above-mentioned technical scheme, carry to the sealing medium between main pump seal shell and the main shaft can flow to first constant pressure inslot along the delivery port for the sealing medium in the first constant pressure inslot exerts pressure to the sealing ring once more, makes the pressure of sealing ring both sides further tend to the equilibrium, makes the sealing ring be in the float dress state.
Optionally, one side of the first constant pressure groove close to the first sealing element is in a closed arrangement, and one side of the first constant pressure groove far away from the first sealing element is in an open arrangement.
By adopting the technical scheme, one side of the first pressure balancing groove, which is close to the first sealing element, is arranged in a closed manner, so that a large amount of sealing medium is prevented from flowing to the position where the first sealing element is located to cause larger pressure on the first sealing element, and the first sealing element is prevented from being damaged due to larger pressure; one side of the first constant pressure groove, which is far away from the first sealing element, is provided with an opening, so that the sealing medium entering between the sealing shell and the main shaft can flow into the first constant pressure groove along the conveying hole and the gap between the pressure ring and the sealing ring.
Optionally, a second constant pressure groove is formed in the mounting seats of the rotary sealing assembly and the fixed sealing assembly in the circumferential direction, and the second constant pressure groove is located on one side, close to the main shaft, of the first sealing element.
By adopting the technical scheme, the sealing medium conveyed between the main pump sealing shell and the main shaft can flow between the sealing rings and the main shaft along the gap between the two sealing rings, and at the moment, the sealing medium can flow into the second constant pressure groove along the gap between the sealing rings and the main shaft, so that the sealing medium in the second constant pressure groove exerts pressure on the sealing rings again, the pressure on the two sides of the sealing rings further tends to be in a balanced state, and the phenomenon that the sealing rings are damaged due to pressure imbalance is further prevented; along with the continuous conveying of the sealing medium, the sealing medium flows to the wedge-shaped surfaces along the gap between the two sealing rings, so that the sealing medium applies acting force to the sealing rings, and the sealing rings are slightly deformed due to the arrangement of the first constant pressure groove and the second constant pressure groove, so that the included angle between the two wedge-shaped surfaces is gradually reduced, the trend of increasing the leakage rate of the sealing medium is reduced (slowed down), the leakage rate cannot be rapidly increased according to the included angle between the fixed wedge-shaped surfaces, and the increase of the leakage rate is not large; conversely, with the decrease of the pressure of the sealing medium, the included angle between the wedge surfaces of the two sealing rings is gradually increased, the trend that the leakage rate of the sealing medium is reduced (slowed down) along with the decrease of the pressure is reduced, the leakage rate is not rapidly reduced according to the included angle between the fixed wedge surfaces, and the reduction of the leakage rate is not large; compared with a static pressure shaft seal with an included angle between fixed wedge-shaped surfaces, the novel main pump static pressure shaft seal structure provided by the patent can obviously improve the stability of sealing performance, and under the working condition of operating pressure change, the novel main pump static pressure shaft seal structure provided by the patent has the advantages that the change range of leakage rate is obviously reduced, and the required pressure of the whole system on the primary sealing injection water flow is reduced; and the leakage rate is more stable under the condition of pressure fluctuation in normal operation.
Optionally, one side of the second constant pressure groove close to the first sealing element is closed, and one side of the second constant pressure groove far away from the first sealing element is open.
By adopting the technical scheme, one side of the second constant pressure groove, which is close to the second sealing element, is sealed, so that a large amount of sealing medium is prevented from flowing to the position where the first sealing element is located to cause larger pressure on the first sealing element, the first sealing element is prevented from being damaged by bearing larger pressure, a small amount of sealing medium can flow to the position where the first sealing element is located, the upper sealing medium and the lower sealing medium exert pressure on the first sealing element at the same time, and the first sealing element is prevented from being damaged due to unbalanced pressure; the side of the second constant pressure groove far away from the second sealing element is arranged in an opening mode, so that the sealing medium can flow into the second constant pressure groove along the gap between the sealing ring and the main shaft.
Optionally, the opposite surfaces of the sealing ring of the rotary sealing assembly and the sealing ring of the fixed sealing assembly are both set as sealing surfaces, the sealing surfaces of the rotary sealing assembly and/or the fixed sealing assembly are set as wedge-shaped surfaces, the parts of the sealing surfaces of the rotary sealing assembly and the fixed sealing assembly, which are close to the main shaft, are set as planes, and the wedge-shaped surfaces extend towards the direction close to the sealing surface on the other side.
By adopting the technical scheme, when the sealing medium conveyed between the sealing shell and the main shaft flows between the two wedge-shaped surfaces, the two wedge-shaped surfaces are obliquely arranged, so that the pressure of the position with larger distance and the pressure of the position with smaller distance are larger, the pressure of the sealing medium directly conveyed into the first constant pressure groove through the conveying hole is larger, the effect of constant pressure can be achieved on the position with larger distance, the pressure of the sealing medium flowing into the second constant pressure groove through the sealing ring and the main shaft is smaller, the effect of constant pressure can be achieved on the position with smaller distance, the pressure on the two sides of the sealing ring is further balanced, and the phenomenon that the sealing ring is damaged due to unbalanced pressure is further prevented; along with the continuous conveying of the sealing medium, the sealing medium flows to the wedge-shaped surfaces along the gap between the two sealing rings, so that the sealing medium applies acting force to the sealing rings, and the sealing rings are slightly deformed due to the arrangement of the first constant pressure groove and the second constant pressure groove, so that the included angle between the two wedge-shaped surfaces is gradually reduced, the trend of increasing the leakage rate of the sealing medium is reduced (slowed down), the leakage rate cannot be rapidly increased according to the included angle between the fixed wedge-shaped surfaces, and the increase of the leakage rate is not large; conversely, with the decrease of the pressure of the sealing medium, the included angle between the wedge surfaces of the two sealing rings is gradually increased, the trend that the leakage rate of the sealing medium is reduced (slowed down) along with the decrease of the pressure is reduced, the leakage rate is not rapidly reduced according to the included angle between the fixed wedge surfaces, and the reduction of the leakage rate is not large; compared with a static pressure shaft seal with an included angle between the fixed wedge-shaped surfaces, the novel main pump static pressure shaft seal structure provided by the patent can obviously improve the stability of the sealing performance, and under the working condition of operating pressure change, the novel main pump static pressure shaft seal structure provided by the patent has the advantages that the change range of the leakage rate is obviously reduced, and the required pressure of the whole system on the primary sealing injection water flow is reduced; and the leakage rate is more stable under the condition of pressure fluctuation in normal operation.
Optionally, an accommodating groove for the compression ring to move in is formed in the outer wall of the mounting seat in the axial direction.
Through adopting above-mentioned technical scheme, the setting up of holding tank can make whole rotary seal subassembly and fixed seal subassembly's structure compacter to sealing effect between clamping ring, sealing ring and the mount pad has been improved.
Optionally, the both sides that just are located the holding tank on the diapire of holding tank are provided with the second sealing member along the equal hoop in circumference position of holding tank diapire, the second sealing member is used for sealing the clearance between clamping ring and the holding tank diapire.
Through adopting above-mentioned technical scheme, the second sealing member of one side can play the effect that blocks to the sealing medium that flows between clamping ring and the mount pad in the first balanced pressure groove and between clamping ring and the sealing ring, and the second sealing member of opposite side can play the effect that blocks to the sealing medium that carries between sealed casing and the main shaft along the clearance flow between clamping ring and the mount pad.
Optionally, a plurality of weighing apparatus pressure holes have been seted up along the circumference position of holding tank between the diapire of holding tank and being located both sides second sealing member, the one end in weighing apparatus pressure hole runs through the mount pad and extends to the position between clamping ring and the mount pad, and the other end runs through the mount pad and extends to the position between mount pad and the main shaft.
By adopting the technical scheme, part of sealing medium can enter the pressure balancing hole after flowing out along the gap between the two inclined planes, the sealing medium flowing into the gap between the pressure ring and the mounting seat along the gap between the pressure ring and the sealing ring can apply pressure to one side of the second sealing element, the sealing medium flowing into the gap between the pressure ring and the mounting seat along the gap between the sealing shell and the main shaft can apply pressure to one side of the other second sealing element along the gap between the pressure ring and the mounting seat, the sealing medium entering the pressure balancing hole can flow to the position of the second sealing element along the gap between the pressure ring and the sealing ring, the pressure is simultaneously applied to the second sealing elements on two sides, the two sides of the second sealing element are simultaneously applied with pressure, the second sealing element is balanced in pressure, and the second sealing element is prevented from being damaged due to uneven pressure.
Optionally, the hoop has seted up the spread groove on the inner wall of clamping ring, the hoop is provided with the connection boss that is located the spread groove on the outer wall of sealing ring, clamping ring and sealing ring pass through the mutual butt of spread groove and connecting strip.
Through adopting above-mentioned technical scheme, when the clamping ring removed towards the mount pad, clamping ring accessible spread groove and connection boss drove the sealing ring and remove towards the mount pad, adopt the spread groove and connect the setting of boss to make whole rotary seal subassembly and fixed seal subassembly's structure compacter to sealing effect between sealing ring, clamping ring and the mount pad has been improved.
In summary, the present application includes at least one of the following beneficial technical effects:
along with the continuous conveying of the sealing medium, the sealing medium flows to the wedge-shaped surfaces along the gap between the two sealing rings, so that the sealing medium applies acting force to the sealing rings, the sealing rings are slightly deformed due to the arrangement of the first constant pressure groove and the second constant pressure groove, and the included angle between the two wedge-shaped surfaces is gradually reduced, so that the trend of increasing the leakage rate of the sealing medium is reduced (slowed down), the leakage rate cannot be rapidly increased according to the included angle between the fixed wedge-shaped surfaces, and the increase of the leakage rate is not large; on the contrary, along with the reduction of the pressure of the sealing medium, the included angle between the wedge surfaces of the two sealing rings is gradually increased, the trend that the leakage rate of the sealing medium is reduced (slowed down) along with the reduction of the pressure is reduced, the leakage rate is not rapidly reduced according to the included angle between the fixed wedge surfaces, and the reduction amount of the leakage rate is not large; compared with static-pressure shaft seals with included angles between the fixed wedge-shaped surfaces, the novel main pump static-pressure shaft seal structure provided by the patent can obviously improve the stability of the sealing performance, and under the working condition of operating pressure change, the novel main pump static-pressure shaft seal structure provided by the patent has the advantages that the change range of the leakage rate is obviously reduced, and the required pressure of the whole system on the primary sealing injection water flow is reduced; and under the condition of pressure fluctuation in normal operation, the leakage rate is more stable.
Drawings
Fig. 1 is a schematic structural view of the related art;
FIG. 2 is a schematic structural view for showing a rotary seal assembly of the related art;
FIG. 3 is a schematic structural view of an embodiment of the present application showing a rotary seal assembly and a stationary seal assembly;
FIG. 4 is a schematic structural view of an embodiment of the present application showing a rotary seal assembly;
fig. 5 is a schematic structural diagram for showing a fixed seal assembly according to an embodiment of the present application.
Description of the reference numerals: 1. a rotary seal assembly; 2. fixing the sealing component; 3. a mounting seat; 31. a seal ring; 311. a wedge-shaped surface; 312. connecting the bosses; 32. pressing a ring; 321. connecting grooves; 33. a first seal ring; 331. a first seal groove; 34. accommodating grooves; 35. installing a bolt; 351. a counter bore; 36. a first constant pressure tank; 361. a delivery orifice; 37. a second constant pressure tank; 38. a second seal ring; 381. a second seal groove; 39. and (4) balancing pressure holes.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
With reference to fig. 1 and 2, in a related main pump static pressure shaft seal structure, a bolt is usually inserted into the pressure ring 32 and the seal ring 31, and the bolt is inserted into the mounting seat 3 and screwed into the mounting seat 3, in order to maintain the tightening force of the bolt, a certain gap needs to be left between the pressure ring 32 and the mounting seat 3, so that an operator can conveniently control the gap between the seal ring 31 and the mounting seat 3, the operator can indirectly control the sealing effect between the seal ring 31 and the mounting seat 3, and when the bolt needs to be screwed, a special torque wrench needs to be used to control the tightening force of the bolt, so that the width of the gap between the seal ring 31 and the mounting seat 3 can be conveniently controlled.
Referring to fig. 1 and 2, in actual maintenance, the bolt tightening force of the rotary seal assembly 1 and the stationary seal assembly 2 imported from abroad is usually fixed at the time of shipment from abroad, and domestic operators are inconvenient to determine the tightening force of a single bolt, and secondly, a larger number of bolts are usually distributed at circumferential positions of the press ring 32, it is difficult to achieve precise control of the tightening force of each bolt if domestic operators perform maintenance, the tightening force of all bolts cannot be controlled to be the same, and when the number of bolts is large, bolts at different positions need to be sequentially screwed with a certain rule, otherwise, the width of a gap at each position in the circumferential direction of the seal ring 31 is affected to be different, if the operators perform maintenance by themselves, the foreign manufacturers do not guarantee, and besides, the environment inside the main pump is complicated, the increase of temperature causes stress of each part to be changed, and when a gap is left between the press ring 32 and the mount 3, the stress of the bolts is easily changed, thereby causing a situation that maintenance is inconvenient.
With reference to fig. 1 and fig. 2, secondly, when a gap is left between the pressing ring 32 and the mounting seat 3, due to the need of controlling the tightening torque of the bolt, the related main pump hydrostatic shaft seal structure needs to drive a small gap to be left between the sealing ring 31 and the mounting seat 3, even the gap between the sealing ring 31 and the mounting seat 3 is controlled to be 0, when the gap between the sealing ring 31 and the mounting seat 3 is very small, even the gap between the sealing ring 31 and the mounting seat 3 is 0, if the contact surfaces of the two sealing rings 31 are wedge surfaces 311, the sealing medium conveyed between the sealing housing and the main shaft will generate different forces on various positions on the wedge surface 311 of the sealing ring 31, and when forces of different degrees are applied on the wedge surface 311 of the sealing ring 31, the gap between the sealing ring 31 and the mounting seat 3 will be changed, or the sealing ring 31 will be damaged.
The embodiment of the application discloses a novel nuclear main pump static pressure shaft seal structure which can obviously improve the stability; as shown in FIG. 3, a can show novel nuclear main pump hydrostatic shaft seal structure that improves stability, including rotary seal subassembly 1 and fixed seal subassembly 2, rotary seal subassembly 1 and fixed seal subassembly 2 all include mount pad 3, sealing ring 31 and clamping ring 32, and mount pad 3 of rotary seal subassembly 1 is used for the hoop to set up on the main shaft of main pump and follows the synchronous rotation of main shaft, and mount pad 3 of fixed seal subassembly 2 is used for the hoop to set up in the seal shell of main pump.
Referring to fig. 4 and 5, the sealing ring 31 of the rotary seal assembly 1 and the sealing ring 31 of the fixed seal assembly 2 are abutted to each other, the opposite surfaces of the sealing ring 31 of the rotary seal assembly 1 and the sealing ring 31 of the fixed seal assembly 2 are both sealing surfaces, the sealing surfaces of the rotary seal assembly 1 and/or the fixed seal assembly 2 are the wedge surfaces 311, the portions of the sealing surfaces of the rotary seal assembly 1 and the fixed seal assembly 2 close to the main shaft are both flat surfaces, and the wedge surfaces 311 extend towards the direction close to the sealing surface on the other side.
With reference to fig. 4 and 5, a first seal is circumferentially arranged on the mounting seat 3 for abutting the sealing ring 31; in this embodiment, the first sealing element includes the first sealing ring 33, the first sealing ring 33 is elastically disposed, and can be made of materials such as carbon graphite or polytetrafluoroethylene, a first sealing groove 331 for allowing the first sealing ring 33 to move into is circumferentially disposed on the mounting seat 3, and the first sealing groove 331 is located at a position just abutting against each other with respect to the two wedge surfaces 311.
With reference to fig. 4 and 5, the pressing ring 32 is configured to abut against the sealing ring 31 and the mounting seat 3 at the same time, a connecting groove 321 is circumferentially formed on an inner wall of the pressing ring 32, a connecting boss 312 located in the connecting groove 321 is circumferentially formed on an outer wall of the sealing ring 31, one side of the connecting groove 321 close to the mounting seat 3 is disposed to penetrate through the pressing ring 32, one side of the connecting groove 321 far away from the mounting seat 3 is disposed in a closed manner, and the pressing ring 32 and the sealing ring 31 abut against each other through the connecting groove 321 and the connecting boss 312; the outer wall of the mounting seat 3 is provided with an accommodating groove 34 for the press ring 32 to move in.
With reference to fig. 4 and 5, the pressing ring 32 is provided with an installation component for fixing the pressing ring 32 on the installation seat 3 so as to drive the sealing ring 31 to abut on the first sealing member, in this embodiment, the installation component includes the installation bolt 35, the installation bolt 35 is arranged on the pressing ring 32 in a penetrating manner, the installation bolt 35 is inserted and connected in the installation seat 3 at the same time, in order to prevent the mutual influence of the installation bolt 35 on the pressing rings 32 on two sides, and the counter bores 351 for allowing the heads of the installation bolts 35 to move into are respectively arranged on the opposite surfaces of the pressing rings 32 on two sides.
With reference to fig. 4 and 5, when the mount fixes the press ring 32 against the mount 3, a pressure-balancing gap is left between the seal ring 31 and the mount 3; a first constant pressure groove 36 is circumferentially formed in the mounting seat 3 of the rotary seal assembly 1 and the fixed seal assembly 2, and in this embodiment, a gap between the seal ring 31 and a bottom wall of the first constant pressure groove 36 is an upper portion of the constant pressure gap; the first constant pressure groove 36 is positioned on one side of the first sealing element, which is far away from the spindle, one side of the first constant pressure groove 36, which is close to the first sealing element, is in a closed arrangement, one side of the first constant pressure groove 36, which is far away from the first sealing element, is in an open arrangement, and the closed end of the first constant pressure groove 36 is positioned at a position close to the first sealing groove 331; in order to convey the sealing medium conveyed between the sealing shell and the main shaft into the first constant pressure groove 36 through the gap between the pressing ring 32 and the sealing ring 31, a plurality of conveying holes 361 for guiding the sealing liquid conveyed between the sealing shell and the main shaft into the first constant pressure groove 36 are formed in the circumferential positions of the pressing ring 32 on the rotary sealing assembly 1 and the fixed sealing assembly 2 along the circumferential direction of the pressing ring 32, and a second constant pressure groove 37 is formed in the mounting seat 3 of the rotary sealing assembly 1 and the fixed sealing assembly 2 in the circumferential direction; one side of the second constant pressure groove 37 close to the first sealing element is closed, one side of the second constant pressure groove 37 far away from the first sealing element is open, and the closed end of the second constant pressure groove 37 is positioned close to the first sealing groove 331; in this embodiment, the width of the pressure-balancing gap is 0.05-0.15mm.
The sealing medium flowing into the first constant pressure groove 36 and the second constant pressure groove 37 along the gap between the sealing ring 31 and the mounting seat 3 can flow into the first sealing groove 331 along the gap between the sealing ends of the first constant pressure groove 36 and the second constant pressure groove 37 and the sealing ring 31, so that both sides of the first sealing element in the first sealing groove 331 can bear pressure at the same time, the first sealing element is stressed in a balanced manner, and the first sealing element is prevented from being damaged due to uneven stress.
Referring to fig. 4 and 5, second sealing members are circumferentially arranged on the bottom wall of the receiving groove 34 and on both sides of the receiving groove 34 along the circumferential position of the bottom wall of the receiving groove 34, and the second sealing members are used for sealing the gap between the pressing ring 32 and the bottom wall of the receiving groove 34; in the present embodiment, two second sealing members are provided, one of which is used for blocking the sealing medium flowing into the gap between the pressure ring 32 and the mount 3 along the gap between the pressure ring 32 and the seal ring 31, and the other is used for blocking the sealing medium flowing into the gap between the pressure ring 32 and the mount 3 directly along the gap between the seal housing and the main shaft; the second sealing member includes second sealing washer 38, and second sealing washer 38 is elastic setting, can adopt materials such as carbon graphite or polytetrafluoroethylene to make, and the hoop is offered on the holding tank 34 diapire of mount pad 3 to be used for supplying the second seal groove 381 that second sealing washer 38 moved into.
With reference to fig. 4 and 5, the sealing medium flowing into the gap between the pressure ring 32 and the mounting seat 3 along the gap between the pressure ring 32 and the sealing ring 31 may apply pressure to one side of the second sealing member, the sealing medium flowing directly into the gap between the pressure ring 32 and the mounting seat 3 between the sealing housing and the main shaft may apply pressure to one side of the other second sealing member, in order to balance the forces of the two second sealing members, a plurality of pressure balancing holes 39 are formed on the bottom wall of the receiving groove 34 and between the two second sealing members on the two sides along the circumferential direction of the receiving groove 34, one end of each pressure balancing hole 39 penetrates through the mounting seat 3 and extends to the position between the pressure ring 32 and the mounting seat 3, and the other end penetrates through the mounting seat 3 and extends to the position between the mounting seat 3 and the main shaft; the sealing medium flowing into the gap between the sealing ring 31 and the main shaft between the two wedge-shaped surfaces 311 can enter the pressure balancing hole 39, and the sealing medium in the pressure balancing hole 39 can enter the second sealing groove 381, so that pressure is applied to the second sealing elements on the two sides simultaneously, pressure on the two sides of the second sealing elements is balanced, and the second sealing elements are prevented from being damaged due to uneven pressure.
The implementation principle of the novel nuclear main pump static pressure shaft seal structure capable of remarkably improving the stability in the embodiment of the application is as follows: when one of the rotary sealing assembly 1 and the fixed sealing assembly 2 is damaged, disassembled and reinstalled, an operator penetrates through the mounting bolt 35 on the pressing ring 32 and drives the mounting bolt 35 to be inserted into the mounting seat 3, the gap between the pressing ring 32 and the mounting seat 3 is driven to be adjusted to be 0, the sealing ring 31 can be abutted to the first sealing ring 33, so that a balanced pressure gap is reserved between the sealing ring 31 and the mounting seat 3, the installation and fixation of the rotary sealing assembly 1 and the fixed sealing assembly 2 can be realized by driving the gap between the pressing ring 32 and the mounting seat 3 to be 0 by an erasing operator, the maintenance and reinstallation of the operator are facilitated, when the sealing medium is conveyed between the two sealing rings 31, along with the continuous conveying of the sealing medium, the sealing medium flows onto the wedge-shaped surface 311 along the gap between the two sealing rings 31, so that the sealing medium exerts an acting force on the sealing ring 31, and the first balanced pressure groove 36 and the second balanced pressure groove 37 are arranged, so that the sealing ring 31 is slightly deformed, the included angle between the two wedge-shaped surfaces 311 is gradually reduced, and the included angle of the sealing medium is not increased rapidly, and the leakage rate is not increased as much as the leakage rate is reduced; on the contrary, with the decrease of the pressure of the sealing medium, the included angle between the wedge surfaces 311 between the two wedge surfaces 311 of the two sealing rings 31 will gradually increase, and the trend that the leakage rate of the sealing medium decreases with the decrease of the pressure will also decrease (slow down), but the leakage rate will not decrease rapidly and the amount of decrease of the leakage rate will not be as large as the included angle between the fixed wedge surfaces 311; compared with a static pressure shaft seal with an included angle between the fixed wedge-shaped surfaces 311, the novel main pump static pressure shaft seal structure provided by the patent can obviously improve the stability of sealing performance, and under the working condition of operating pressure change, the novel main pump static pressure shaft seal structure provided by the patent has the advantages that the change range of leakage rate is obviously reduced, and the required pressure of the whole system on the primary sealing injection water flow is reduced; in addition, under the condition of pressure fluctuation in normal operation, the leakage rate is more stable; at this time, part of the sealing medium can enter the first constant pressure groove 36 through the conveying hole 361, so that the sealing medium in the first constant pressure groove 36 and the sealing medium between the two wedge-shaped surfaces 311 have an effect of balancing pressure on the sealing ring 31, the sealing medium can flow between the sealing ring 31 and the main shaft along the gap between the two wedge-shaped surfaces 311, at this time, part of the sealing medium can flow into the second constant pressure groove 37, so that the sealing medium in the second constant pressure groove 37 and the sealing medium between the two wedge-shaped surfaces 311 have an effect of balancing pressure on the sealing ring 31 again, so that the sealing ring 31 is uniformly stressed, the phenomenon that the sealing ring 31 is damaged due to nonuniform stress is prevented, the sealing medium passing through the gap between the two wedge-shaped surfaces 311 can flow into the constant pressure hole 39 along the gap between the sealing ring 31 and the main shaft, thereby having a constant pressure effect on the second sealing member, and preventing the second sealing member from being damaged due to nonuniform pressure.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The utility model provides a can show nuclear main pump static pressure shaft seal structure who improves stability which characterized in that: including rotary seal subassembly (1) and fixed seal subassembly (2), rotary seal subassembly (1) and fixed seal subassembly (2) all include mount pad (3), sealing ring (31) and clamping ring (32), mount pad (3) of rotary seal subassembly (1) are used for the hoop to set up on the main shaft of main pump and follow the synchronous rotation of main shaft, mount pad (3) of fixed seal subassembly (2) are used for the hoop to set up in the sealed casing of main pump, sealing ring (31) of rotary seal subassembly (1) and sealing ring (31) of fixed seal subassembly (2) butt extremely together each other, mount pad (3) are gone up to being provided with to the first sealing member that is used for supplying sealing ring (31) butt, first sealing member includes first sealing washer (33), clamping ring (32) are used for simultaneously with sealing ring (31) and mount pad (3) butt, be provided with clamping ring (32) on clamping ring (3) and fix clamping ring (31) with drive clamping ring (31) butt to the mounting piece on mount pad (3) when grafting mounting bolt (35) and installing in screw thread mounting piece (32), butt installation bolt (35) is worn to install on mounting piece (3) and screw thread mounting piece (32) simultaneously, and install in installation (3) and screw thread mounting piece (3) and install, A constant pressure gap is reserved between the sealing ring (31) and the mounting seat (3), the mounting bolt (35) penetrates through the pressing ring (32), the mounting bolt (35) is driven to be inserted and connected into the mounting seat (3) in a threaded manner, the gap between the pressing ring (32) and the mounting seat (3) is driven to be adjusted to be 0, and the sealing ring (31) can be abutted to the first sealing ring (33);
a first constant pressure groove (36) is formed in the mounting seat (3) of the rotary sealing assembly (1) and the mounting seat (3) of the fixed sealing assembly (2) in the circumferential direction, the first constant pressure groove (36) is located on one side, away from the main shaft, of the first sealing element, and a plurality of conveying holes (361) used for guiding sealing liquid conveyed between the sealing shell and the main shaft into the first constant pressure groove (36) are formed in the circumferential positions, along the pressing ring (32), of the rotary sealing assembly (1) and the mounting seat (2) of the fixed sealing assembly (2);
a second constant pressure groove (37) is formed in the mounting seats (3) of the rotary sealing assembly (1) and the fixed sealing assembly (2) in the circumferential direction, and the second constant pressure groove (37) is positioned on one side, close to the main shaft, of the first sealing element;
the opposite surfaces of the sealing ring (31) of the rotary sealing assembly (1) and the sealing ring (31) of the fixed sealing assembly (2) are set as sealing surfaces, the part, far away from the main shaft, of the sealing surface of the rotary sealing assembly (1) and/or the fixed sealing assembly (2) is set as a wedge-shaped surface (311), the part, close to the main shaft, of the sealing surface of the rotary sealing assembly (1) and the fixed sealing assembly (2) is set as a plane, and the wedge-shaped surface (311) extends towards the direction close to the sealing surface on the other side;
when the sealing medium is conveyed between the two sealing rings (31), the sealing medium flows onto the wedge-shaped surface (311) along the gap between the two sealing rings (31) along with the continuous conveying of the sealing medium, so that the sealing medium exerts acting force on the sealing rings (31), and the sealing rings (31) are slightly deformed due to the arrangement of the first constant pressure groove (36) and the second constant pressure groove (37).
2. The static pressure shaft seal structure of the nuclear main pump capable of improving the stability remarkably as claimed in claim 1, wherein: one side that first constant pressure groove (36) are close to first sealing member is the closed setting, one side that first constant pressure groove (36) are kept away from first sealing member is the opening setting.
3. The static pressure shaft seal structure of the nuclear main pump capable of improving the stability remarkably as claimed in claim 1, wherein: one side that second balanced pressure groove (37) are close to first sealing member is the closed setting, one side that first sealing member was kept away from in second balanced pressure groove (37) is the opening setting.
4. The static pressure shaft seal structure of the nuclear main pump capable of improving the stability remarkably as claimed in claim 1, wherein: an accommodating groove (34) used for allowing the pressing ring (32) to move in is formed in the outer wall of the mounting seat (3) in the circumferential direction.
5. The hydrostatic shaft seal structure of a nuclear main pump capable of remarkably improving stability according to claim 4, wherein: the two sides of the bottom wall of the accommodating groove (34) are circumferentially provided with second sealing pieces along the circumferential positions of the bottom wall of the accommodating groove (34), and the second sealing pieces are used for sealing gaps between the pressure ring (32) and the bottom wall of the accommodating groove (34).
6. The hydrostatic shaft seal structure of the nuclear main pump capable of remarkably improving the stability according to claim 5, wherein: on the diapire of holding tank (34) and be located between the second sealing member of both sides and seted up a plurality of weighing apparatus along the circumference position of holding tank (34) and press hole (39), the one end that presses hole (39) is run through mount pad (3) and is extended to the position between clamping ring (32) and mount pad (3), and the other end runs through mount pad (3) and extends to the position between mount pad (3) and the main shaft.
7. The hydrostatic shaft seal structure of the nuclear main pump capable of remarkably improving the stability according to claim 1, wherein: connecting groove (321) have been seted up to the hoop on the inner wall of clamping ring (32), the hoop is provided with connection boss (312) that are located connecting groove (321) on the outer wall of sealing ring (31), clamping ring (32) and sealing ring (31) are through connecting groove (321) and the mutual butt of connection boss (312).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111556717.0A CN114215919B (en) | 2021-12-17 | 2021-12-17 | Can show novel nuclear main pump static pressure bearing seal structure that improves stability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111556717.0A CN114215919B (en) | 2021-12-17 | 2021-12-17 | Can show novel nuclear main pump static pressure bearing seal structure that improves stability |
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| CN114215919A CN114215919A (en) | 2022-03-22 |
| CN114215919B true CN114215919B (en) | 2022-12-13 |
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| CN202111556717.0A Active CN114215919B (en) | 2021-12-17 | 2021-12-17 | Can show novel nuclear main pump static pressure bearing seal structure that improves stability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114576195A (en) * | 2022-04-28 | 2022-06-03 | 中密控股股份有限公司 | Novel compensation seal assembly for secondary seal of static pressure shaft seal of nuclear main pump |
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| US4961678A (en) * | 1988-08-12 | 1990-10-09 | Westinghouse Electric Corp. | Reactor coolant pump having double dam seal with self-contained injection pump mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112815096A (en) * | 2021-02-03 | 2021-05-18 | 沈阳北碳密封有限公司 | Sodium pump maintenance seal and use method thereof |
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| DE3129933A1 (en) * | 1980-09-08 | 1982-06-03 | Anstalt für Strömungsmaschinen GmbH, 8045 Graz | Slide ring packing |
| US4961678A (en) * | 1988-08-12 | 1990-10-09 | Westinghouse Electric Corp. | Reactor coolant pump having double dam seal with self-contained injection pump mechanism |
| JPH09144892A (en) * | 1995-11-27 | 1997-06-03 | Mitsubishi Heavy Ind Ltd | Static pressure seal |
| JP2000356265A (en) * | 1999-06-16 | 2000-12-26 | Osaka Gas Co Ltd | Seal part for fluid treating device |
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| Publication number | Publication date |
|---|---|
| CN114215919A (en) | 2022-03-22 |
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