EP3308029A1 - Pompe avec organe d'imperdabilité - Google Patents
Pompe avec organe d'imperdabilitéInfo
- Publication number
- EP3308029A1 EP3308029A1 EP16730775.0A EP16730775A EP3308029A1 EP 3308029 A1 EP3308029 A1 EP 3308029A1 EP 16730775 A EP16730775 A EP 16730775A EP 3308029 A1 EP3308029 A1 EP 3308029A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connecting member
- drive shaft
- pump
- hub
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
- F04D29/044—Arrangements for joining or assembling shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/20—Mounting rotors on shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/84—Redundancy
Definitions
- the invention generally relates to pumps, especially the primary pumps of nuclear reactors.
- the invention relates to a pump, of the type comprising:
- a pump wheel comprising a hub placed in the extension of the drive shaft, the hub having an orifice
- connection of the pump wheel to the shaft comprising a connecting member having a first end portion connected to the drive shaft and a second end portion opposite to the first end engaged in the orifice; link further comprising a support member connected to the second end portion of the connecting member and bearing against a face of the hub opposite to the drive shaft;
- connection comprising a plurality of auxiliary connecting members, each solidarisant the pump wheel to the drive shaft.
- the connecting member is a stud, the support member being a nut screwed on the second end of the stud.
- the nut and the second end of the stud become a migrating body in the primary circuit. This migrating body can damage other equipment, especially in the heart of the nuclear reactor.
- the invention aims to propose a pump whose safety is improved.
- the invention relates to a pump of the aforementioned type, characterized in that the pump further comprises a captive member connected to the connecting member and interposed between the drive shaft and the hub, shaped chosen to not be able to cross the orifice in case of breakage of the connecting member.
- the pump wheel In case of breakage of the connecting member, the pump wheel remains connected to the drive shaft through the auxiliary connecting members.
- the pump can continue to operate, subject to its vibratory behavior.
- the impedance member prevents the support member and the second end of the connecting member from becoming a migrating body in the primary circuit. This migrating body could be driven by the flow of liquid generated by the pump.
- the pump may further have one or more of the following features, considered individually or in any technically feasible combination:
- the captive member is a ring surrounding the connecting member;
- the connecting member has an external thread, the captive member having an internal thread cooperating with the external thread;
- the external thread is formed on the second end portion of the connecting member, the support member being a nut screwed on the external thread;
- the connecting member has a shoulder, defining a positioning stop of the impermeability member axially along the connecting member;
- the hub is delimited towards the drive shaft by a substantially frustoconical inner surface, the captive member having a substantially frustoconical radial surface of shape conjugate to that of said inner surface and arranged vis-à-vis said internal surface;
- the inner surface of the hub and the radial surface of the captive member have between them along the axis of rotation a gap of less than 5 mm, preferably less than 2 mm;
- the captive member is not in contact with the hub
- connection of the pump wheel to the drive shaft comprises a needle screw blocking in rotation the captive member relative to the connecting member;
- the connecting member is a stud extending along the axis of rotation of the drive shaft
- the orifice has perpendicular to the axis of rotation a first cross section, the captive member having perpendicular to the axis of rotation a second cross section greater than the first cross section in at least one direction.
- the invention relates to a nuclear reactor comprising:
- a vessel in which nuclear fuel assemblies are housed, the vessel having at least one primary coolant inlet and at least one primary coolant outlet;
- the primary circuit connecting said primary cooling fluid outlet to said primary cooling fluid inlet, the primary circuit comprising a pump having the above characteristics, ensuring the circulation of the primary cooling fluid along the primary circuit.
- - Figure 1 is a perspective view of a primary pump according to the invention, a part of the structures being torn off to reveal the internal organs of the pump; and - Figure 2 is a partial sectional view of the pump wheel and the end of the drive shaft of the pump of Figure 1.
- the pump 1 shown in FIG. 1 is a nuclear reactor primary pump. It comprises a rotary drive shaft 3 about an axis of rotation X, and a pump wheel 5. In the example shown, the axis of rotation X is vertical.
- the pump further comprises a motor 7 for driving the shaft in rotation around the axis X.
- the shaft 3 is guided in rotation by an upper bearing 9, placed above the motor 7, which comprises a stop 1 1 providing an axial guide and a guide bearing 13 which participates in the radial guide.
- the shaft 3 is further guided in rotation by a lower bearing 15, also participating in the radial guide.
- the lower bearing 15 is placed under the engine 7.
- the drive shaft 3 is further guided in rotation by a hydrodynamic bearing 17, interposed along the drive shaft 3 between the lower bearing 15 and the pump wheel 5.
- a shaft seal 19 seals along the drive shaft 3, between the primary fluid under pressure and the atmosphere.
- the wheel 5 is housed in a volute 21, comprising an inlet duct 23 and an outlet duct 25.
- the pump 1 is of the centrifugal type, so that the inlet duct 23 is located under the wheel 5, in the extension of the drive shaft 3, and the outlet duct 25 is offset radially with respect to the drive shaft and the pump wheel.
- the motor 7 is fixed to the volute 21 via a casing 27, surrounding the drive shaft 3.
- the pump wheel 5 is cantilevered on a lower end 29 of the drive shaft.
- the pump wheel 5 comprises a hub 31 placed in the extension of the drive shaft 3.
- the pump 1 comprises a connection 33 of the pump wheel 5 to the shaft 3.
- the link 33 links the hub 31 to the lower end 29 of the shaft 3.
- the wheel 5 comprises a central inlet 35 and a plurality of radial outlets 37, each connected to the central inlet 35 by a channel delimited inside the wheel 5.
- the inlet 35 is located in the axial extension of the hub 31 , vis-à-vis the inlet duct 23 of the volute.
- the hub 31 has an orifice 39.
- connection 33 of the pump wheel to the shaft comprises a connecting member 41, having a first end portion 43 connected to the drive shaft 3 and a second end portion 45 engaged in the orifice 39 .
- the orifice 39 is placed on the axis of rotation X.
- the link 33 further comprises a support member 47 connected to the second end portion 45, which bears against a face of the hub 31 opposite to the drive shaft 3.
- the support member 47 urges the wheel 5 towards the lower end 29 of the drive shaft.
- the connecting member 41 is a stud, elongated along the axis of rotation X. Its first end portion 43 is engaged in a threaded housing 49, formed in the lower end 29 of the drive shaft. 3. The first end portion 43 carries an external thread, cooperating with the internal thread of the housing 49.
- the second end portion 45 of the connecting member 41 carries an external thread
- the support member 47 is a nut screwed on this external thread 50.
- the hub 31 has a generally frustoconical general shape, the orifice 39 being located at the top of the truncated cone.
- the section of the hub 31 is reduced, from a base 51 located near the lower end 29 of the drive shaft 3, to the orifice 39.
- the hub 31 delimits an internal volume 52, open at the base 51 towards the drive shaft 3.
- the hub 31 has an inner surface 53 delimiting the internal volume 52, and an outer surface 54 delimiting the circulation channels of the primary fluid inside the wheel 10.
- the support member 47 comprises a cylindrical portion 55, extended axially by a head 56.
- the cylindrical portion 55 carries an internal thread cooperating with the external thread 50 of the second end portion 45 of the connecting member. It is engaged in the orifice 39.
- the head 56 defines a shoulder 57 projecting radially outwardly around the cylindrical portion 55. The shoulder 57 is supported around the orifice 39, on one side of this opposite orifice to the drive shaft 3. Thus, the head 56 of the nut is not housed in the internal volume 52 of the hub.
- the head 56 is shaped to fit in the extension of the hub 31, and form a vertex for the hub. Its outer surface is in line with the outer surface 54 of the hub.
- the connection 33 also comprises a central screw 58 passing through the head 56 of the support member 47, and screwed into the second end 45 of the connecting member.
- the support member 47 is rigidly fixed to the central screw 58, for example by set screws or by welding spots.
- the central screw 58 is provided to lock in rotation the support member 47 relative to the connecting member 41, so as to prevent any disengagement of the support member.
- connection 33 of the wheel 5 to the shaft 3 further comprises a plurality of ancillary connecting members 59.
- Each auxiliary connecting member 59 secures the hub 31 to the drive shaft 3.
- the ancillary connecting members 59 are typically peripheral studs
- the pump 1 comprises a captive member 60 connected to the connecting member 41 and interposed between the drive shaft 3 and the hub 31.
- the captive member 60 is of a shape chosen for not being able to cross the orifice 39 in the event of rupture of the connecting member 41.
- the impedance member 60 is chosen so as to present perpendicularly to the axis of rotation X a second larger cross-section. than the first straight section in at least one direction.
- the captive member 60 has for example a circular section of second diameter greater than the first diameter
- the captive member 60 is disposed within the inner volume 52 of the hub.
- the captive member 60 is a ring surrounding the connecting member 41.
- the ring has an annular shape.
- the captive member 60 has an internal thread 61 cooperating with an external thread of the connecting member 41.
- the internal thread 61 cooperates with the external thread 50 formed on the second end portion 45 of the connecting member.
- the internal thread 61 of the fastener member cooperates with a dedicated external thread formed on the connecting member 41, and is distinct from the external thread 50 provided for the support member 47.
- the connecting member 41 also has a shoulder 63, defining a positioning stop of the impedance member 60 axially along the body of the link 41.
- the shoulder 63 projects radially outwards with respect to the thread 50. It is arranged axially at a short distance from the thread 50.
- the captive member 60 is delimited towards the bearing member 47 by a large annular face 65, and toward the drive shaft 3 by another large annular face 67.
- annular face 67 carries a ring 69, being placed around the shoulder 63.
- the ring 69 is substantially cylindrical, and coaxial with the axis of rotation X.
- the ring 69 bears on a radially inner face a shoulder 71, which bears against the shoulder 63 in the axial direction.
- connection 33 of the pump wheel 5 to the shaft 3 comprises a set screw 73 blocking in rotation the captive member 60 relative to the connecting member 41.
- the set screw extends radially to through the ring 69, and is engaged in a blind hole in the shoulder 63.
- the captive member 60 is located, axially, away from the drive shaft 3, without contact therewith.
- the base 51 of the hub is connected to the drive shaft 3, in addition to the adjoining connecting members 59, by Hirth toothing (not shown), transmitting the rotational torque of the shaft to the hub.
- Hirth toothing is typically arranged on a diameter close to that of the adjoining connecting members 59. A force contact between the impermeability member and the hub would upset the connection by the toothing between the hub and the shaft.
- the captive member 60 is located, axially, between the shoulder 63 and the support member 47.
- the inner surface 53 of the hub 31, facing the drive shaft 3, is substantially frustoconical.
- the impedance member 60 has a substantially frustoconical radial surface 77 of a shape conjugate with that of the inner surface 53 and arranged opposite this internal surface 53.
- the radial surface 77 corresponds to the edge of the captive member, connecting the large faces 65 and 67 to each other. It extends all around the X axis, and is coaxial with this X axis.
- the inner surface 53 of the hub and the radial surface 77 of the captive member have between them, along the axis of rotation X, a spacing of less than 2 mm, preferably less than 1 mm.
- the surface radial 77 bears against the inner surface 53, with only a slight axial displacement possible. Therefore, the head of the support member 47 does little or no protrusion inside the wheel 5 in case of rupture of the connecting member 41. There can be no significant vibration , related to the stresses to which the nut 47 is subjected because of the high-speed flow of the primary fluid inside the wheel 5.
- This spacing is fixed according to:
- the mounting of the pump wheel 5 on the drive shaft 3 is carried out as follows.
- the captive member 60 is first mounted on the connecting member 41. In the example shown, it is screwed onto the external thread 50 of the second end portion 45 of the connecting member, up to the shoulder 71 comes into abutment on the shoulder 63. The set screw 73 is then put in place, so as to lock in rotation the cap member 60 with respect to the connecting member 41.
- the connecting member 41 is mounted on the drive shaft 3. More precisely, in the example shown, the first end portion 43 of the connecting member is screwed into the orifice 49.
- the pump wheel 5 is then mounted on the drive shaft 3.
- the wheel 5 is axially approached from this drive shaft 3, so as to engage the second end portion 45 of the connecting member 41 in the orifice 39.
- the support member 47 is screwed onto the second end portion 45 of the connecting member.
- the cylindrical portion 55 thus penetrates inside the orifice 39, and the head 56 abuts against the edge of the orifice 39 via the shoulder 57.
- the final position of the body support 47 along the connecting member 41 is chosen so as to maintain a predetermined axial spacing between the inner surface 53 of the hub and the radial surface 77 of the captive member 60.
- auxiliary connecting members 59 are mounted so as to rigidly fix the base of the hub 31 to the drive shaft 3.
- the invention has many advantages.
- the captive member 60 prevents the second end portion 45 of the connecting member 41 and the support member 47 from becoming a migrating body in case of rupture of the connecting member 41 between the shaft transmission device 3 and the immobilizer 60. Indeed, the weight of the support member 47 and the second end portion 45 tends to cause the captive member 60 to the orifice 39, but this, because of its shape, can not The support member 47 and the second end portion 45 remain connected to the hub 31 and can not detach from it.
- cap member 60 in the form of a ring facilitates manufacture and mounting on the connecting member 41. It is possible to confer a symmetry of revolution, which does not generate unbalance during operation of the pump.
- Screwing the captive member 60 on the connecting member 41 allows a quick and easy implementation.
- the invention has been described above for a primary pump of a nuclear reactor. However, it could apply to any other type of pump, in another circuit of a nuclear reactor, or even in an industrial installation other than a nuclear reactor.
- the pump can be of any type, and is not necessarily a centrifugal pump.
- the wheel may be mounted on the drive shaft in any suitable manner, and not necessarily by a central stud surrounded by peripheral studs.
- connecting member has been described as a stud, but may be a screw, a tie rod, or any other type of suitable connecting member.
- the captive member has been described as being a ring. In other embodiments, the captive member could consist of a series of pads, attached around the connecting member, or could still be constituted by a flange made of material in the connecting member. .
- the captive member can be fixed not by screwing on the connecting member, but by welding or by keys, or by any other suitable means.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1555370A FR3037365B1 (fr) | 2015-06-12 | 2015-06-12 | Pompe avec organe d'imperdabilite |
| PCT/EP2016/063340 WO2016198629A1 (fr) | 2015-06-12 | 2016-06-10 | Pompe avec organe d'imperdabilité |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3308029A1 true EP3308029A1 (fr) | 2018-04-18 |
| EP3308029B1 EP3308029B1 (fr) | 2019-07-10 |
Family
ID=54291419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16730775.0A Active EP3308029B1 (fr) | 2015-06-12 | 2016-06-10 | Pompe avec organe d'imperdabilité |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3308029B1 (fr) |
| CN (1) | CN107743551B (fr) |
| FR (1) | FR3037365B1 (fr) |
| WO (1) | WO2016198629A1 (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2117011A (en) * | 1935-02-27 | 1938-05-10 | Ward E Pratt | Centrifugal pump |
| DE3021318C2 (de) * | 1980-06-06 | 1982-04-22 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | Wellenverbindung |
| FR2649165B1 (fr) * | 1989-06-29 | 1994-07-08 | Jeumont Schneider | Liaison roue-arbre, notamment pour une pompe de refroidissement d'un reacteur nucleaire |
| WO2013165840A1 (fr) * | 2012-05-02 | 2013-11-07 | Borgwarner Inc. | Roue de turbine de turbocompresseur à faible contrainte ayant un montage à trou traversant fileté |
| CN202867244U (zh) * | 2012-10-19 | 2013-04-10 | 福建省尤溪长波水力机械有限公司 | 抽水、发电两用的水轮泵 |
| CN203384088U (zh) * | 2013-07-03 | 2014-01-08 | 中国核电工程有限公司 | 核电厂混凝土蜗壳泵泵轴与叶轮的连接结构 |
-
2015
- 2015-06-12 FR FR1555370A patent/FR3037365B1/fr not_active Expired - Fee Related
-
2016
- 2016-06-10 WO PCT/EP2016/063340 patent/WO2016198629A1/fr not_active Ceased
- 2016-06-10 EP EP16730775.0A patent/EP3308029B1/fr active Active
- 2016-06-10 CN CN201680034027.XA patent/CN107743551B/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3037365B1 (fr) | 2019-10-25 |
| FR3037365A1 (fr) | 2016-12-16 |
| EP3308029B1 (fr) | 2019-07-10 |
| WO2016198629A1 (fr) | 2016-12-15 |
| CN107743551B (zh) | 2019-07-16 |
| CN107743551A (zh) | 2018-02-27 |
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