CN203009365U - Nuclear main pump with fluid obstruction apparatus - Google Patents
Nuclear main pump with fluid obstruction apparatus Download PDFInfo
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- CN203009365U CN203009365U CN 201220083897 CN201220083897U CN203009365U CN 203009365 U CN203009365 U CN 203009365U CN 201220083897 CN201220083897 CN 201220083897 CN 201220083897 U CN201220083897 U CN 201220083897U CN 203009365 U CN203009365 U CN 203009365U
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- main pump
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Abstract
The utility model relates to a nuclear main pump with a fluid obstruction apparatus. The main pump comprises main structures like a pump housing, impellers, a first radial bearing, an inner seal, a pumping ring, a second radial bearing, an outer seal, a pressure regulating cylinder and the like, and the main pump is characterized in that the pump housing is connected with the pump ring through the pressure regulating cylinder; the pressure regulating cylinder comprises a cooler, a fluid infusion valve, a spring, a piston position indication plate, a piston rod and a piston; and a fluid obstruction sealing structure comprises a pressure cover, a movable ring, a sealing ring, a spring, a spring box, a spindle sleeve, a static ring, a sealing ring and a pressure cover pad. The nuclear main pump employing the structure can reduce leakage loss, can prevent severe accident generated by nuclear leakage, simultaneously lift and efficiency of the nuclear main pump are improved, and the fluid obstruction apparatus also generates buffer effects for vibration and impact.
Description
Technical field
The present invention relates to fluid machinery, particularly a kind of core main pump with the fluid-blocking device.
Background technique
Nuclear reactor coolant main circulating pump (being called for short the core main pump) is the visual plant of nuclear power station, is called the heart of reactor cooling system, and its major function is flow resistance, the assurance circular flow that overcomes Main Coolant.Most of pressurized-water reactor nuclear power plant adopts shaft seal pump as the core main pump in the world, shaft seal pump adopts the mode of controlling the Main Coolant leakage rate to realize high pressure sealing and fluid film lubrication, its mechanical seal is key technology, mechanical sealing assembly is to hold flimsy parts most on the core main pump, slightly there is the operation deviation can cause leakage amount abnormity, even cause reactor scram event, Threat Reaction heap safety also will cause huge economic loss.According to the main pump working condition is investigated, the fault more than 70% is from mechanical seal.Because needing long transmission shaft, the core main pump comes transmitting torque, therefore higher to the required precision of axle and bearing.But through after working long hours, impeller and the sealing of sealing between the grease chamber have failure phenomenon, cause working medium to leak entering sealing oil indoor, destroy the precision of bearing and axle, greatly reduce the working efficiency of core main pump, even the reliability operation of entail dangers to core main pump.
Summary of the invention
For addressing the above problem, employing of the present invention solves sealing problem with the core main pump of fluid-blocking device.Existing the end face film between mechanical seal end surface, guarantee the stable of mechanical seal end surface film, is the key of keeping its sealing effect, guarantee that the end face film is stabilising membrane, though only need guarantee that the end face film does not undergo phase transition or undergoes phase transition the applying that does not destroy end face and gets final product.Introduce the principle of fluid-blocking mechanical seal, the seal leakage problem that the Long-term Effect is produced is resolved.
Realize that the technological scheme that above-mentioned purpose adopts is:
Why mechanical seal can seal is owing to existing the end face film between mechanical seal end surface, and the form of end face film has determined the effect of sealing.Due to the difference of operating mode, exist the end face film of three kinds of patterns such as liquid phase, gas-liquid mixed phase and gas phase between mechanical seal end surface.The reason that the end face film exists different shape is sealed liquid during near saturation state, boiling or flash distillation occur, namely undergoes phase transition.And in a single day the end face film undergoes phase transition, and larger variation will occur the back pressure of film, thereby it is unstable to cause end face to be fitted.So the key of dealing with problems is how to guarantee that the end face film of mechanical seal is stabilising membrane.Obviously, guarantee that the end face film is stabilising membrane, though only need guarantee that the end face film does not undergo phase transition or undergo phase transition the applying that does not destroy end face.
The effect of mechanical seal is to prevent that fluid from flowing to the other end from the one end, and there is pressure reduction in the both sides that the reason that generation is flowed is mechanical seal.Now in the core main pump, flowing medium flows to atmosphere, and reason is that the pressure of fluid is greater than barometric pressure.By above analysis as can be known, under existing operating mode, flowing medium is during as the end face film, and end face is easy to be rushed to open.If at the other end of the flowing medium larger flowing medium of exerting pressure, and this flowing medium is more sealed under existing operating mode, has so just realized the conversion of sealing medium, and leakage problem is resolved.In fact, the mechanical seal that a lot of import pumps configure is exactly this principle, it is characterized in that adopting transient equiliblium sealing system with pressure, so-called transient equiliblium is exactly that the suffered positive pressure of mechanical seal end surface remains within the specific limits, and the variation with hydrodynamic pressure does not change.
According to above principle, adopt a kind of core main pump with the fluid-blocking device, comprise the main structures such as pump case, impeller, the first radial bearing, inner seal, pumping ring, the second radial bearing, outer side sealing, voltage regulation cylinder, it is characterized in that connecting pump case and pumping ring with voltage regulation cylinder; Voltage regulation cylinder comprises cooler, make-up valve, spring, piston position indicator board, piston rod, piston; The fluid-blocking sealing configuration comprises gland, rotating ring, seal ring, spring, spring case, axle sleeve, stationary ring, seal ring, gland pad.
The invention has the beneficial effects as follows: reduce leakage loss, prevent that nuclear leakage from producing major accident, reduce economic loss, also can improve simultaneously lift and the efficient of core main pump, and the fluid-blocking device also plays a part buffering vibration and impact.
The present invention is on probation through the user, and reaction effect is good, can effectively reduce investment outlay, energy saving.
Description of drawings
Fig. 1 is the core Structure of RCP schematic diagram with the fluid-blocking device of one embodiment of the present of invention.
In Fig. 1: 1. pump case, 2. impeller, 3. the first radial bearing, 4. inner seal, 5. pumping ring, 6. the second radial bearing, 7. outer side sealing, 8. voltage regulation cylinder.
Fig. 2 is the structural representation of voltage regulation cylinder.
In Fig. 2: 9. cooler, 10. make-up valve, 11. springs, 12. piston position indicator boards, 13. piston rods, 14. pistons.
Fig. 3 is the fluid-blocking sealed structural representation.
In Fig. 3: 15. glands, 16. rotating rings, 17. seal rings, 18. springs, 19. spring cases, 20. axle sleeves, 21. stationary rings, 22. seal rings, 23. gland pads.
Embodiment
Fig. 1, Fig. 2 and Fig. 3 have determined the structural type of the present embodiment center main pump jointly.Fig. 1 is the core Structure of RCP schematic diagram with the fluid-blocking device, the integrity structure that comprises the fluid-blocking device comprises pump case (1), impeller (2), the first radial bearing (3), inner seal (4), pumping ring (5), the second radial bearing (6), outer side sealing (7), voltage regulation cylinder (8) etc.Fig. 2 is the structural representation of voltage regulation cylinder, comprises cooler (9), make-up valve (10), spring (11), piston position indicator board (12), piston rod (13), piston (14).Fig. 3 is the fluid-blocking sealed structural representation, comprises gland (15), rotating ring (16), seal ring (17), spring (18), spring case (19), axle sleeve (20), stationary ring (21), seal ring (22), gland pad (23).In Fig. 1 and Fig. 2, A, B, C represent the flow direction of sealing fluid.
The effect of mechanical seal is to prevent that fluid from flowing to the other end from the one end, and there is pressure reduction in the both sides that the reason that generation is flowed is mechanical seal.Now in the core main pump, flowing medium flows to atmosphere, and reason is that the pressure of flowing medium is greater than barometric pressure.Under existing operating mode, during as the end face film, end face is easy to be rushed to open this flowing medium.If the other end at this flowing medium applies the flowing medium larger than this fluid medium pressure (a kind of synthetic white oil), and this flowing medium is more sealed under existing operating mode, so just realized the conversion of sealing medium, leakage problem is resolved.The mechanical seal that a lot of import pumps configure is exactly this principle.Be transient equiliblium sealing system with pressure, so-called transient equiliblium is exactly that the suffered positive pressure of mechanical seal end surface remains within the specific limits, and the variation with fluid medium pressure does not change.
Piston (14) top of voltage regulation cylinder (8) is a kind of synthetic white oil, selects the spring (18) of suitable bearing area up and down and proper stiffness can guarantee that synthetic white oil exceeds the pressure of 0.1-0.2MPa than flowing medium in core main pump.Synthetic white oil is a kind of lubricant oil with better combination property, and between end face, the fluid constituent of the film is synthetic white oil like this.Under above-mentioned operating mode, the saturation vapor pressure of white oil can obtain stable end face film much smaller than the end face malleation.
Voltage regulation cylinder (8) piston (14) bottom is the impulse side, in the core main pump, the dynamic pressure of flowing medium directly causes piston (14) bottom, piston (14) moves up and down with the variation of pressure, the pressure of upper flow (white oil) is changed in the same way with the variation of fluid medium pressure in the core main pump, form dynamic seal (packing).By the pump circulation of pumping ring (5) and the gravity circulation of thermal siphon, cause effective flushing and heat radiation to sealing friction pair.Sealing fluid cooler (9) is housed simultaneously, can carries out sealing fluid cooling incessantly.By observing the position of piston position indicator board (12), can judge whether sealing is in normal state.Because the greasy property of white oil is very good, thereby obtained large increase the working life of mechanical seal.
Claims (3)
1. core main pump with the fluid-blocking device, comprise the main structures such as pump case (1), impeller (2), the first radial bearing (3), inner seal (4), pumping ring (5), the second radial bearing (6), outer side sealing (7), voltage regulation cylinder (8), it is characterized in that connecting pump case (1) and pumping ring (5) with voltage regulation cylinder (8).
2. core main pump according to claim 1, with voltage regulation cylinder (8), voltage regulation cylinder (8) comprises cooler (9), make-up valve (10), spring (11), piston position indicator board (12), piston rod (13), piston (14).
3. core main pump according to claim 1, the fluid-blocking sealing configuration is housed, and the fluid-blocking sealing configuration comprises gland (15), rotating ring (16), seal ring (17), spring (18), spring case (19), axle sleeve (20), stationary ring (21), seal ring (22), gland pad (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220083897 CN203009365U (en) | 2012-03-08 | 2012-03-08 | Nuclear main pump with fluid obstruction apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220083897 CN203009365U (en) | 2012-03-08 | 2012-03-08 | Nuclear main pump with fluid obstruction apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203009365U true CN203009365U (en) | 2013-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220083897 Expired - Fee Related CN203009365U (en) | 2012-03-08 | 2012-03-08 | Nuclear main pump with fluid obstruction apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203009365U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110071A (en) * | 2021-10-11 | 2022-03-01 | 江苏鼎吉能源工程技术有限公司 | Viscous fluid damper with variable damping coefficient stages |
-
2012
- 2012-03-08 CN CN 201220083897 patent/CN203009365U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110071A (en) * | 2021-10-11 | 2022-03-01 | 江苏鼎吉能源工程技术有限公司 | Viscous fluid damper with variable damping coefficient stages |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20140308 |