US3929569A - Plate spring or retaining grid for a bunch cylindrical elements engaged in a heat exchange process - Google Patents

Plate spring or retaining grid for a bunch cylindrical elements engaged in a heat exchange process Download PDF

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Publication number
US3929569A
US3929569A US374065A US37406573A US3929569A US 3929569 A US3929569 A US 3929569A US 374065 A US374065 A US 374065A US 37406573 A US37406573 A US 37406573A US 3929569 A US3929569 A US 3929569A
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US
United States
Prior art keywords
compartment
sidewall
spring
grid
plate spring
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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.)
Expired - Lifetime
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US374065A
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English (en)
Inventor
Gijsbrecht Gerhardus Piepers
Leonard Hendrik Vons
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Reactor Centrum Nederland
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Reactor Centrum Nederland
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Classifications

    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/18—Leaf springs
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
    • F16F15/073—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only leaf springs
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/34—Spacer grids
    • G21C3/356—Spacer grids being provided with fuel element supporting members
    • G21C3/3566—Supporting members formed only of elements fixed on the strips
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to a retaining grid or supporting grid for laterally supporting a bunch of cylindrical elements engaged in a heat exchange process, the supporting grid being made up of strip material in such a way that a plurality of compartments is formed.
  • One of the objects of the invention is to indicate a structure for a grid of this kind in which a plate spring is introduced at least at one position into aside wall of a compartment.
  • the plate spring extends in two directions and, when released, shows an arched form in one direction in its principal middle part, whilst the outer ends of the plate spring are in rigid connection with fixing points of the said side wall, between which fixing points and a span of distance near at least one end of the plate spring a smaller section is similarly arched in the form of a plate spring.
  • the said cylindrical elements may consist, for instance, of rods or bars of fissile or breeding material which are introduced into the core of a nuclear reactor.
  • the same set-up may also be used for a heat exchanger.
  • the cylindrical compartments consist of pipes around which there is a flow of media to be cooled or heated.
  • the said plate springs have a non-linear spring characteristic.
  • the pressure increase with the degree of compression according to the dimensional conditions ruling at any moment, but remains constant or decreases within a certain range. Consequently, it is possible within certain limits to apply an equal pressure to all the cylindrical elements, independently of manufacturing and assembling tolerances and temperature effects. This is of particular importance in cases where the pressure and spring tensions may not exceed certain permissible maximum values. It is not necessary to give the spring a symmetrical shaping in the longitudinal direction. Thus, it is quite possible to use a plate spring having only one curved section in connection with the arched span. In this embodiment the plate spring is shorter, which is advantageous to the flow of medium around it.
  • his a further object of the invention to use a plate spring having only on one side a curved section in connection with the arched span.
  • the advantage of this form of spring is that the spring becomes shorter and can therefore be manufactured in a more simple and hence less expensive manner.
  • a plate spring which shows at least on one side of the large archlike convexity smaller convex spring portions which are outwardly curved towards the opposite side of the large convexity.
  • a form of spring is obtained which is characterized in that it can be produced in a very easy manner if these small convexities of the spring are formed at both ends.
  • This rod holder which is situated in the other compartment of the grid, serves to provide a firm point of support for the fissile rod by means of a few projecting parts.
  • the springs used consist of an assembly of two or more springs mounted one above the other. In the case where two springs are used, these two springs are connected at least to each others ends.
  • the assembly of plate springs formed in this way is connected at its ends to the grid by means of so-called backing strips (rod holders).
  • FIG. 1 shows these spring characteristics.
  • FIG. 2 shows a longitudinal section II-II taken through the retainning grid according to FIG. 4.
  • FIG. 3 represents a longitudinal section III III taken through the retaining grid according to FIG. 4.
  • FIG. 4 gives a top plan view of the retaining grid.
  • FIG. 5 gives a top plan view of a non-symmetrical plate spring.
  • FIG. 6 is a front elevation of a cross-shaped rodshielding element.
  • FIG. 7 gives a side view of a non-symmetrical plate spring according to FIG. 5.
  • FIG. 8 shows, in an elevation according to VIII, a rod holder as used in FIG. 9.
  • FIG. 9 discloses a vertical cross-section of a grid element in which the plate springs used show an amended form of construction.
  • FIG. 10 shows a side elevation of a doubly constructed non-symmetrical spring.
  • FIG. 1 shows the spring characteristics of plate spring of the kind described.
  • the force K by which the plate is compressed in plotted along the vertical axis (see also FIG. 3).
  • the spring deformation f is represented by the horizontal axes. This spring deformation is measured in the middle 27 of the plate spring (see FIG. 3).
  • Characteristic b shows a trend which ensures a constant resiliency K between the limits d and e.
  • Characteristic b shows that it is also possible to make the resiliency K diminish according as the deformation increases.
  • Springs with this characteristic as well as springs with characteristic b are suitable for intercepting the vibration of pipes or fuel rods. Such vibrations, which may be due to variations of pressure in the cooling medium, have hitherto frequently been a source of difficulty, as they are liable to cause fatigue fractures.
  • FIG. 4 shows, in a top plan view of a supporting grid 1, how a plurality of rods 2 of fissile material are supported in this grid.
  • the grid consists of a plurality of strips 3, 4, 5 and 6 which are permanently connected with each other at points 14, 15, 16 and 17, at which intersecting strips interlock. In this .way a plurality of grid compartments 7 is formed.
  • a plate spring 8 For one of these sections the figure shows in detail how these rods 2 of fissile material are supported by a plate spring 8 together with a rod holder having two bends 78 and 79 each of which shows a protrusion 81, 82.
  • FIG. 3 shows, in a longitudinal section of the element of fissile material depicted in FIG. 4, how the plate springs used are shaped.
  • each plate spring shows an arched middle part which merges at its two ends into smaller plate spring parts 16 with an arching similar to that of the middle part 15.
  • each end of the plate spring is rigidly fixed, e.g. by means of spot welds, to a side wall portion 5 of a compartment 7.
  • FIG. 3 For the sake of clarity this is again shown in FIG. 3 in a longitudinal section III III of the grid. It can furthermore be seen from the figure that in the middle of the larger wall portion a protrusion 27 is provided which is adjacent to the adjoining surface of the fissile rod 2.
  • FIGS. 5 and 7 show a modified form in which a plate spring is shaped non-symmetrically with only one arched part.
  • FIG. 4 If a rectangular set-up of the fissile rods is to be provided, the FIG. 4 construction offers a simple and inexpensive mode of solution.
  • vertical strips 5 and 6 are connected by means of soldered or plasma-welded joints 14, 15, 16 and 17.
  • the plate springs 8 are fixed to the transverse strips 5 and 7 respectively. These springs may be of the kind shown as spring 8 in FIG. 2 or as springs in FIGS. 5 and 7.
  • Rod holders 76 and 77 give the fissile rod 2 a firm hold at points and 46.
  • FIG. 6 gives a top plan view of a rod holder 77.
  • the curved clamps 81 and 82 provide a firm hold. These clamps are the opposite ends of the cross-beam or strip of the cross-shaped part 77.
  • the longitudinal strip 85 is used for spot welds at points 86 and 87.
  • FIG. 2 is a front elevation of the plate spring 8 used in FIG. 3. It distinctly shows the positions 23 at which a spot weld has been made.
  • FIG. 9 shows in common with FIG. 3 a vertical crosssection of the grid, in which, however, a variant upon the letter figure is depicted.
  • two apertures 90 and 91 respectively are provided in the grid walls 6 and 5 respectively. Since there are corresponding apertures 92 and 93 respectively in the backing strip or rod holder 95, the plate spring portions 96 and 97 which are bent over with small archings can be pushed through these apertures. During this action the spring 25 is supported by its end 98, bent over practically at right angles, in the edges 99 of the apertures.
  • this construction can without difficulty be made in such a way that when the plate spring is pushed through apertures 90 and 91 a snap effect is brought about, so that the spring is not only fixed in the apertures but can as it were be locked in them.
  • FIG. 8 shows the view according to VIII on the rear side of the retaining plate 95.
  • This plate is provided with bent-over edges 100 and 101 by means of which the retaining plate is fixed upon the edges 102 and 103 of apertures 92 and 93.
  • spot welds may furthermore be provided at the positions 23.
  • FIG. 10 a construction is depicted partly in crosssection and partly in side elevation, in which a spring 104 and a spring 105 are superimposed upon each other and fixed by means of spot welds 106 and 107. If desired, a few other spot welds may be provided over the length of the spring, for example at 108.
  • Spring 105 has for the sake of clarity been given a different shade of colour from spring 104. From FIG. 10 it can also be seen that the retaining plate 109 is in this case provided with two protrusions 110 and 111 which pass through apertures 112 and 113 so as to come into contact with the underside of 105, where they are fixed with the same spot weld by means of which the spring portions themselves are joined to each other.
  • a supporting grid for supporting a plurality of elements engaged in a heat exchange process against sideways shifting comprising: a plurality of grid strips connected together to form the sidewalls of a plurality of compartments having parallel axes; a plate spring extending longitudinally in each compartment, said plate spring having a continuous surface facing the sidewall of the respective compartment, said spring having a central arch-like bend projecting toward the center of the respective compartment for engaging an element therein and having at each end of the arch-like bend a smaller bend facing in the opposite direction, said spring further having straight end portions which engage the sidewall of the respective sidewall, each end portion extending longitudinally outwardly from the respective smaller bend so that the surface of the end portion engaging the sidewall is part of said continuous surface, each of said smaller bends projecting through I an aperture in the adjacent sidewall and engaging only that edge of the respective aperture which is adjacent the straight end portions of the plate spring to thereby fasten said plate spring to said adjacent sidewall; and an element holder in each compartment engaging the sidewall opposite the respective plate spring and having a portion
  • said element holder includes a plate portion engaging the compartment sidewall, said plate portion being provided with two apertures each of which coincides with one of said apertures in the compartment sidewall, an edge of each aperture in the plate portion being bent into a lip which grasps the edge of the corresponding aperture in the compartment sidewall.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US374065A 1972-07-10 1973-06-27 Plate spring or retaining grid for a bunch cylindrical elements engaged in a heat exchange process Expired - Lifetime US3929569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2233904A DE2233904A1 (de) 1972-07-10 1972-07-10 Haltegitter fuer ein buendel zylindrischer elemente, die an einem waermeaustauschvorgang teilnehmen

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US374065A Expired - Lifetime US3929569A (en) 1972-07-10 1973-06-27 Plate spring or retaining grid for a bunch cylindrical elements engaged in a heat exchange process

Country Status (9)

Country Link
US (1) US3929569A (nl)
JP (1) JPS4964058A (nl)
BE (1) BE802107A (nl)
DE (1) DE2233904A1 (nl)
FR (1) FR2192283B1 (nl)
GB (1) GB1433342A (nl)
IT (1) IT989746B (nl)
NL (1) NL7308547A (nl)
SE (1) SE379882B (nl)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028180A (en) * 1976-03-16 1977-06-07 The United States Of America As Represented By The United States Energy Research And Development Administration Support grid for fuel elements in a nuclear reactor
FR2352373A1 (fr) * 1976-05-21 1977-12-16 Exxon Nuclear Co Inc Grille d'espacement pour elements combustibles de reacteurs nucleaires
US4152205A (en) * 1976-07-15 1979-05-01 Kraftwerk Union Aktiengesellschaft Spacer support for water-cooled nuclear reactor fuel elements
US4175003A (en) * 1976-12-23 1979-11-20 Westinghouse Electric Corp. Grid for nuclear reactor fuel assemblies
US4224107A (en) * 1978-05-09 1980-09-23 Commissariat A L'energie Atomique Spacer grids for a nuclear reactor fuel assembly
US4474730A (en) * 1982-08-05 1984-10-02 Westinghouse Electric Corp. Nuclear fuel spacer grid
US4818479A (en) * 1985-10-04 1989-04-04 The United States Of America As Represented By The United States Department Of Energy Nuclear reactor spacer grid and ductless core component
US4897241A (en) * 1981-11-30 1990-01-30 Combustion Engineering, Inc. Anti-bow grid for nuclear fuel assembly
US5072786A (en) * 1990-07-27 1991-12-17 Electric Power Research Institute, Inc. Anti-vibration support of U-bend flow tubes in a nuclear steam generator
US20150247677A1 (en) * 2014-02-28 2015-09-03 Denso International America, Inc. Insert for heat exchanger and heat exchanger having the same
US10219532B2 (en) * 2013-11-05 2019-03-05 Fujifilm Corporation Sterilization tray and moist heat sterilization method

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50157314A (nl) * 1974-06-07 1975-12-19
JPS5838311Y2 (ja) * 1978-01-30 1983-08-30 三菱重工業株式会社 熱交換器の伝熱管支持装置
US4337827A (en) * 1980-10-01 1982-07-06 The Babcock & Wilcox Company Helical steam generator tube support
JPS59212695A (ja) * 1983-05-17 1984-12-01 ウエスチングハウス　エレクトリツク　コ−ポレ−シヨン 管支持格子
DE29521378U1 (de) * 1994-09-30 1997-02-27 Siemens AG, 80333 München Verbiegungsarmes Brennelement eines Druckwasserreaktors
DE19916893C1 (de) * 1999-04-14 2000-10-12 Siemens Ag Abstandhalter für ein Leichtwasserreaktor-Brennelement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379617A (en) * 1965-05-25 1968-04-23 Westinghouse Electric Corp Means for supporting fuel elements in a nuclear reactor
US3646994A (en) * 1969-12-23 1972-03-07 Reactor Centrum Nederland Spacer grid respectively plate spring for a bunch of cylindrical elements taking part in a heat-exchanging process
US3679546A (en) * 1968-10-22 1972-07-25 Nus Corp Nuclear reactor fuel rod support grid
US3769159A (en) * 1968-06-24 1973-10-30 Combustion Eng Fuel element grid support for nuclear reactor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379617A (en) * 1965-05-25 1968-04-23 Westinghouse Electric Corp Means for supporting fuel elements in a nuclear reactor
US3769159A (en) * 1968-06-24 1973-10-30 Combustion Eng Fuel element grid support for nuclear reactor
US3679546A (en) * 1968-10-22 1972-07-25 Nus Corp Nuclear reactor fuel rod support grid
US3646994A (en) * 1969-12-23 1972-03-07 Reactor Centrum Nederland Spacer grid respectively plate spring for a bunch of cylindrical elements taking part in a heat-exchanging process

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028180A (en) * 1976-03-16 1977-06-07 The United States Of America As Represented By The United States Energy Research And Development Administration Support grid for fuel elements in a nuclear reactor
FR2352373A1 (fr) * 1976-05-21 1977-12-16 Exxon Nuclear Co Inc Grille d'espacement pour elements combustibles de reacteurs nucleaires
US4077843A (en) * 1976-05-21 1978-03-07 Exxon Nuclear Company, Inc. Nuclear reactor spring strip grid spacer
US4152205A (en) * 1976-07-15 1979-05-01 Kraftwerk Union Aktiengesellschaft Spacer support for water-cooled nuclear reactor fuel elements
US4175003A (en) * 1976-12-23 1979-11-20 Westinghouse Electric Corp. Grid for nuclear reactor fuel assemblies
US4224107A (en) * 1978-05-09 1980-09-23 Commissariat A L'energie Atomique Spacer grids for a nuclear reactor fuel assembly
US4897241A (en) * 1981-11-30 1990-01-30 Combustion Engineering, Inc. Anti-bow grid for nuclear fuel assembly
US4474730A (en) * 1982-08-05 1984-10-02 Westinghouse Electric Corp. Nuclear fuel spacer grid
US4818479A (en) * 1985-10-04 1989-04-04 The United States Of America As Represented By The United States Department Of Energy Nuclear reactor spacer grid and ductless core component
US5072786A (en) * 1990-07-27 1991-12-17 Electric Power Research Institute, Inc. Anti-vibration support of U-bend flow tubes in a nuclear steam generator
US10219532B2 (en) * 2013-11-05 2019-03-05 Fujifilm Corporation Sterilization tray and moist heat sterilization method
US20150247677A1 (en) * 2014-02-28 2015-09-03 Denso International America, Inc. Insert for heat exchanger and heat exchanger having the same
US9903658B2 (en) * 2014-02-28 2018-02-27 Denso International America, Inc. Insert for heat exchanger and heat exchanger having the same
US20180112922A1 (en) * 2014-02-28 2018-04-26 Denso International America, Inc. Insert for heat exchanger
US10274258B2 (en) * 2014-02-28 2019-04-30 Denso International America, Inc. Insert for heat exchanger

Also Published As

Publication number Publication date
JPS4964058A (nl) 1974-06-21
IT989746B (it) 1975-06-10
SE379882B (nl) 1975-10-20
DE2233904A1 (de) 1974-01-31
BE802107A (nl) 1973-11-05
FR2192283A1 (nl) 1974-02-08
NL7308547A (nl) 1974-01-14
GB1433342A (en) 1976-04-28
FR2192283B1 (nl) 1978-08-04

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