阅读说明：本技术 反应堆冷却剂泵流体静压型机械密封 (Reactor coolant pump Hydrostatic die mould mechanical seal ) 是由 刘祥松 徐坚 杨晓峰 刘亨 吴景鑫 高玉爽 郑立新 李函霖 董娜 魏晓玲 于 2019-08-23 设计创作，主要内容包括：本发明涉及一种反应堆冷却剂泵流体静压型机械密封,滑动环1通过圆柱销与轴套、泵轴组成旋转部套,限位爪3控制滑动环1的径向位移,静止环2通过圆柱销、弹簧与底环组成静止部套。滑动环1工作端面由环形锥度11与坝区12组成,静止环2工作端面为环形锥度13。密封副的工作面锥度与坝区均需进行精研磨。本发明结构简洁且拆装方便、适用性强,通过调整密封副外径,适用于密封不同的系统压力,对密封介质可以实现可控泄漏量。(The present invention relates to a kind of reactor coolant pump Hydrostatic die mould mechanical seal, slip ring 1 forms rotating part set by straight pin and axle sleeve, pump shaft, and position-limited claw 3 controls the radial displacement of slip ring 1, and stationary ring 2 forms stationary part set by straight pin, spring and base ring.1 operative end surface of slip ring is made of annular taper 11 with dam area 12, and 2 operative end surface of stationary ring is annular taper 13.The working face taper and Ba Qu of sealing pair are both needed to carry out smooth grinding.Structure of the invention is succinct and convenient for disassembly and assembly, by adjusting sealing pair outer diameter, suitable for sealing different system pressures, controllable leak amount may be implemented to sealing medium in strong applicability.)

1. a kind of reactor coolant pump Hydrostatic die mould mechanical seal, it is characterized in that: slip ring (1), stationary ring (2), limit Pawl (3) forms hydrodynamic mechanical seal, and slip ring (1), straight pin (6), axle sleeve (5) and pump shaft (7) form rotating part set；Axis Set (5) covers on pump shaft (7), and straight pin (6) is installed in axle sleeve (5) and pump shaft (7) end face blind hole, and pump shaft (7) is passing through circle Pin (6) transmits torque, and position-limited claw (3) is fixed on axle sleeve (5) by the first bolt (4), and position-limited claw (3) outer is located at control and slides In the radial groove of rotating ring (1), stationary ring (2), spring (8), the second bolt (9) and base ring (10) form stationary part set；Second Bolt (9) puts together on base ring (10) on base, and stationary ring (2) covers on pump shaft (7), and stationary ring (2) is fitted in spring (8) On.

2. a kind of reactor coolant pump Hydrostatic die mould mechanical seal according to claim 1, it is characterized in that: slip ring (1) operative end surface is made of first annular taper (11) and ring dam area (12), and wherein taper (11) groove depth is 42 μm, Ba Qu (12) length is 5mm, and stationary ring (2) operative end surface is the second annular taper (13), and first annular taper (11) is 5 μm deep.

Technical field:

The present invention relates to reactor coolant pump Hydrostatic die mould mechanical seals.

Background technique:

The shallow slot being widely used at present, which seals, belongs to non-contact mechanical seal, and there are direct solids between seal face Fretting wear causes sealing because sealing initial failure, reduced service life caused by the raising of end face friction temperature, inordinate wear etc.； Seal face mostly uses irregular shallow slot design, waterpower Profile Design complicated, and liquid film thickness and fluid groove depth belong to micron order, and Sealing and bearing part are formed using lubrication groove, radial seal dam and circumferential seal weir, requirement on machining accuracy is high, processing cost It is high；The disassembly of mechanical seal original part is higher with matching requirements, needs special installation tool, and the period is long；Complicated operating condition is easily The abrasion for causing dynamic and static ring is unable to complete reparation, though leakage rate is small, uncontrollable, rotating ring is installed by trundle, is easy to make It twists and warps or twists off at trundle, rotating ring causes the stuck floating Paola Of Failure, Performance that loses to increase due to the beat of shafting.When sealing is situated between Matter is under variable working condition, and especially under high pressure, high-speed working condition, axle envelope is in unstable adjustment state always, is easily occurred early Phase failure, ineffectiveness and stability etc. are also unsatisfactory.

Summary of the invention:

The purpose of the present invention is a kind of open contactless, convenient for disassembly and assembly, applied widely reactor coolant pump streams Body hydrostatic profile mechanical seal.The technical scheme is that a kind of reactor coolant pump Hydrostatic die mould mechanical seal, sliding Ring 1, stationary ring 2, position-limited claw 3 form hydrodynamic mechanical seal, and slip ring 1, straight pin 6, axle sleeve 5 and the composition of pump shaft 7 rotate Portion's set；5 sets of axle sleeve on pump shaft 7, straight pin 6 is installed in axle sleeve 5 and 7 end face blind hole of pump shaft, and pump shaft 7 is passing through straight pin 6 Torque is transmitted, position-limited claw 3 is fixed on axle sleeve 5 by the first bolt 4, and 3 outer of position-limited claw is located at the radial groove of control slip ring 1 Interior, stationary ring 2, spring 8, the second bolt 9 form stationary part set with base ring 10；Second bolt 9 puts together on base ring 10 on base, 2 sets of stationary ring on pump shaft 7, stationary ring 2 is fitted on spring 8.

1 operative end surface of slip ring is made of first annular taper 11 with ring dam area 12, and wherein 11 groove depth of taper is 42 μm, 12 length of dam area is 5mm, and 2 operative end surface of stationary ring is the second annular taper 13, and first annular taper 11 is 5 μm deep.

Working principle of the present invention:

Design feature of the invention is contactless controllable leak mechanical seal, is a kind of hydrostatic profile of liquid-film lubrication, sliding Rotating ring and stationary ring end face have high flatness and finish.Slip ring and stationary ring end face open up waterpower molded line, transport Row operating condition lower sealing surface waterpower molded line generates hydrostatic pressure effect, and sealing surface liquid film has hydrostatic pressure bearing capacity, slip ring It is detached from stationary ring, keeps the seal clearance of a very little, when the closing force and liquid film unlatching that system pressure and spring force generate When power is equal, that is, establish stable system balancing.When system pressure fluctuation is larger, both inlet outlet pressure differential was larger, seal clearance Increase, thickness of liquid film increases, and liquid film stiffness reduces, and opening force reduces, and closing force increases therewith, and seal clearance is also gradually reduced； When inlet outlet pressure differential is smaller, seal clearance reduces, and closing force reduces, and liquid film is thinned, and liquid film stiffness increases, and opening force increases, close Envelope gap is also gradually increased.

Beneficial effects of the present invention:

1 seal face of slip ring is provided with high-precision waterpower molded line 11, and 2 seal face of stationary ring is provided with high-precision waterpower Molded line 13 can be such that sealing liquid film stiffness rapidly increases with the reduction of sealing running clearance in small―gap suture, guarantee sealing tool There are enough opening forces and be unlikely to generate mixing sliding, and then ensure that the service life of sealing；It is more than one in running clearance When determining range, waterpower molded line 11 can be such that sealing liquid film stiffness reduces with the increase of running clearance with waterpower molded line 13, and small In other power that system pressure, spring force etc. promote sealing surface to close, to control the further expansion of seal clearance, and then control Sealing leak amount processed；Under high voltage startup operating condition, the waterpower molded line 11 of seal face, waterpower molded line 13 and attached its of stationary ring The cooperation of his static seal ring recess size, can reduce the axial load of stationary ring, so as to improve performance when being sealed in start and stop, The abrasion of sealing pair is avoided, and then improves the service life of sealing；Sealing surface waterpower molded line 11, dam area 12 and waterpower molded line 13 are all By milled processed, there is high flatness and finish, it is ensured that slide shape in fluid when being sealed in small―gap suture operation State improves the service life of sealing；The working face of sealing pair has very high flatness and the depth of parallelism by grinding, can So that sealing pair is admirably fitted in the preferable secondary sealant support ring of rigidity, thus when reducing sealing pair operation there may be Injurious deformation.

Detailed description of the invention

Fig. 1 is balanced seal sectional arrangement drawing

Fig. 2 is dynamic and static ring sealing surface partial enlarged view

Specific embodiment:

As shown in Figure 1, a kind of reactor coolant pump Hydrostatic die mould mechanical seal, slip ring 1, stationary ring 2, position-limited claw 3 composition hydrodynamic mechanical seals, slip ring 1, straight pin 6, axle sleeve 5 and pump shaft 7 form rotating part set；5 sets of axle sleeve in pump shaft 7 On, straight pin 6 is installed in axle sleeve 5 and 7 end face blind hole of pump shaft, and pump shaft 7 is transmitting torque by straight pin 6, and position-limited claw 3 is by the One bolt 4 is fixed on axle sleeve 5, and 3 outer of position-limited claw is located in the radial groove of control slip ring 1, stationary ring 2, spring 8, the Two bolts 9 form stationary part set with base ring 10；Second bolt 9 puts together on base ring 10 on base, 2 sets of stationary ring on pump shaft 7, Stationary ring 2 is fitted on spring 8.

Sealing pair waterpower molded line as shown in Fig. 2, 1 operative end surface of slip ring by 12 groups of first annular taper 11 and ring dam area At, wherein 11 groove depth of taper is 42 μm, and 12 length of dam area is 5mm, and 2 operative end surface of stationary ring is the second annular taper 13, first Annular taper 11 is 5 μm deep.

Slip ring of the present invention and stationary ring waterpower molded line are a complete circular cone, and grinding size is controllable, with biography There are larger differences for the fluting sealing of system, are verified by high-pressure seal experiment platform, and sealing is stable, and antihypertensive effect is ideal, let out Dew amount is fully controllable.

The present invention be it is contactless, it is convenient for disassembly and assembly, it is applied widely, can be used for the differences such as ACP1000MW, CPR1000MW Heap-type core main pump, and it is convenient for safeguarding, reliable for operation, safe handling degree is high.

The sealing of the present patent application is the combination of flat seal and fluting bearing, (is controllably let out its advantage is that leakage rate is small Leakage), film thickness is big, eliminates contact friction, power consumption and calorific value are small；Seal face waterpower Profile Design at rule geometry, It is easy to process；The installation of sealing element does not need professional tool, convenient for disassembly and assembly, and the period is shorter；Trundle is given up in rotating ring transmission, only Transmission is tightly measured by sealing ring, which gets rid of shafting and deviate the operating condition for causing rotating ring stuck；The design is set using flowing static pressure Meter, the operation of sealing are not influenced by operation medium, operating condition, are suitable for High Pressure Difference, high-revolving shafting seals.