CA1059489A - Arrangement for supporting vertical-axis machine housing - Google Patents
Arrangement for supporting vertical-axis machine housingInfo
- Publication number
- CA1059489A CA1059489A CA277,026A CA277026A CA1059489A CA 1059489 A CA1059489 A CA 1059489A CA 277026 A CA277026 A CA 277026A CA 1059489 A CA1059489 A CA 1059489A
- Authority
- CA
- Canada
- Prior art keywords
- component
- support structure
- vertical
- machine
- plate springs
- 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.)
- Expired
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
TITLE
ARRANGEMENT FOR SUPPORTING VERTICAL-AXIS MACHINE HOUSING
ABSTRACT
A support structure for a component of a vertical-axis machine such as its housing or a bearing spider thereof and particularly a rotary electrical machine which is expand-able under operating conditions due to generation of heat.
In order to maintain a stabilized concentric expansion of the component during thermal expansion the supporting structure is characterized by a system of plate springs arranged in substan-tially vertical planes and wherein the respective planes in which the springs are located lie tangent to the surface of at least one imaginary cylinder co-axial with the axis of the machine component, the radius of the cylinder being smaller than the mean radial distance of the plate springs from the axis of the machine component.
ARRANGEMENT FOR SUPPORTING VERTICAL-AXIS MACHINE HOUSING
ABSTRACT
A support structure for a component of a vertical-axis machine such as its housing or a bearing spider thereof and particularly a rotary electrical machine which is expand-able under operating conditions due to generation of heat.
In order to maintain a stabilized concentric expansion of the component during thermal expansion the supporting structure is characterized by a system of plate springs arranged in substan-tially vertical planes and wherein the respective planes in which the springs are located lie tangent to the surface of at least one imaginary cylinder co-axial with the axis of the machine component, the radius of the cylinder being smaller than the mean radial distance of the plate springs from the axis of the machine component.
Description
~OS~3~
BACKGROUND 0~ THE INVENTION
The present invention relates to an improved arrangement for supporting the housing or bearing spider component of a rotary machine of the vertically arranged axis type such as an electrical machine, the component being expandable during operation, and being supported upon a foundation, or another component of the machine, by means Or plate springs which are arranged in at least substan-tially vertical planes beneath the housing or bearing spider.
A vertical-axis machine housing for example, which is at 10 least approximately rotationally Bymmetrical about the machine axis expands during operation, the expansion being primarily due to changes in temperature. The housing should be free to expand con-centrically with a minimum of inter-stresses between the housing and the foundation or other component on which it is supported. It has already been proposed to support the machine housing on the roundation either by bar springs under compressive stress as dis-closed in Austrian patent OE-PS 164,995, or by means of radially arranged plate springs under compressive stress as disclosed in Austrla~ patent O~-PS 229,959, or by radially arranged plate springs 20 under tenslle stress, as disclosed in Swiss patent CH-PS 530,109.
These structural Bolutlons make possible a mechanical da~ping of an alternating torque and partially also an expansion of the machine housing, but such solutlons will not ensure in a sati~factory manner malntenance Or a complete, i.e., true circularity Or the housing.
ml8 18 especially so in the case of machines of large slze. Ger-man patent DT-GM 1,914,702 descrlbes and lllustrates a dirferent type Or support structure in whlch the machine housing is secured to its support by means of springs which yield in the radlal direction but are rlgld in a tangential dlrectlon. H~wever, thls solution 30 again meets only the requlrement Or rree houslng expansion, ln this case the stator component Or an electrical machine, but without r - 2 -., ., ,.,. _ . ,. - ~ ~ . , .
. . . . . . ~ . , 11)5~89 ..
ensuring maintenanc~e of complete circularity of the stator during operation of the machine.
SUMMARY OF THE INVENTION
The present invention is concerned primarily with the problem of establishing an arrangement for supporting the housing or bearing spider component of a vertical-axis type machine which expands during operation, which will ensure not only complete free-dom of thermally induced expansion but also maintenance of complete circularity. If the inventive concept is utilized for a rotary 10 vertical-axis electrical machine, it is desired that the support also ensure satisfactory damping of forces generated by short-cir-cuit condition~ within the machlne.
In accordance with the invention, these problems are :
solved by means of a plate spring type of support wherein the springs are located in at least sub6tantially vertical planes and wherein the respective planes in which the springs are located lie r tangent to the surface of an imaginary cylinder coaxlal with the axls of the machine component, the radlus of æaid cyllnder being smaller than the mean radlal dlstance of the plate springs ~rom 20 the axis of the machine component.
It 18 a partlcular advantage of the invention that the specific arrangement of the plate spring support makes possible a free thermal expansitivity of the housing or bearing splder Or a rotary vertical-axis electrical machine and ensures also a stabi-lized, true clrcularlty of the component as well as damping for any short-circuit lnduced forces.
It is partlcularly advantageous to arrange the plate sprlngs 80 that they are sub~ected to a compressive gtress by the weight of the component belng supported. mis design i~ very 30 simple from a standpoint of engineering design practlce and ful-fills its task in most instances. Another embodiment is possible wherein the plate springs are sub~ected to tensile 6tress by the ~ 3 --':
, . , ~
~059489 weight of the machine component. This latter solution is partic, ularly advantageous for ingle-phase electrical machines be-,cause the plate springs under tensile stress are able to deflect widely in case of a terminal short-circuit.
It is further advantageous to design the springs in the form of a multiple-plats structure. The thickness of the individual plates is selected in such manner that the maximum per-missible bending stress of the material is not exceeded.
In accordance with one embodiment of the invention, the 10 plate springs supporting the machine housing are arranged individ- ;
ually in a circle about the axis of the machine housing and upstand on the foundation. In another embodiment the plate springs are structurally associated with the arms of a load bearing spider, the spider being connected by the springs to the foundation or to the machine housing. The spider ensures proper centering and permits a relative expansion within the machine parts.
BRIEF DESCRIPTION OF THE DRAWINGS
Th~ accom~nying drawings illustrate four practical embodlment~ of the invention in somewhat schematlc form.
Fig. l ls a front elevatlon of one embodlment of the invention wherein the machine housing is supported upon a foundation by means of a circular array of plate springs in vertical planes and sub-~ectlon to compresslve stress by the weight of the housing; -~
Fig. 2 is a transverse section taken on line ~ -II-II of Fig. l;
Fig. 3 ls a view in elevation of two other embodiments of the inventlon wherein the plate sprlngs ln vertical planes are structurally combined with the the arms of a support spider for securlng the spider to a foundatlon or to the machlne houslng;
., . , . . - , , ~ , . , ~ , . . .
- ~V~948 ~:
Fi~. 4 is a transverse section taken on line IV-IV of Fig. 3; and Fig. 5 is a view in elevation of still another embodlment of the invention wherein the plate springs in vertical planes are sub~ected to ten~ile stress by the weight of the machine housing. ~ -With reference now to Figs. l and 2, which illustrate -;
in principle one embodiment of the invention, the housing 1 of the vertical-axis machine is seen to be supported upon a founda-10 tion 2 by means of a circular array of plate springs 3, 3' located respectively in vertical planes 5 and which are subJected to com-pressive stress by the weight of the housing. Fig. 1 shows only the three springs 3 located at the front portion of the housing.
All of the springs are h~wever included in Fig. 2. m e vertical planes 5 are all seen to lie tangent to one and the same imaginary cylinder 4 located co-axially with the axis of the machine housing l, the radius of said cylinder being smaller than the mean radial dlstance of the springs from the axis of the machine housing. The plate sprin~6 3, 3' form acute angles with the radial direction.
20 In the case where the expansion of the machine houslng 1 is rota-tlonally symmetrical, the radial forces acting upon the plate springs 3, 3' wlll divlde into two components. The component act-ing within plane 5 will cause a practically insignificant deforma-tlon of the plate springs. m e other component which is perpendi- ;
cular to the plane 5 will, however, cause a relatively great move-ment of the plate springs. m e radial expansion o* the machine housing is thus converted to torslon, and a stability of its cir-cular shape is ensured even in the case of an asymmetrical expan-sion or mechanical stress.
Obviously, the plate springs 3, 3' need not be placed directly between the machine housing 1 and its foundation 2. In accordance with two other embodiments illustrated in Figs. 3 and 4, ,: , ' , ~.o59489 the plate springæ ~ support a load-bearing spider structure con-sisting of a hub 6, four radially directed arms 7 extending at right angles from the hub, and beams 8 which interconnect the outer ends of the arms 7, at the machine housing 15 or at the foundation 2 Fig. 5 illustrates a third embodiment wherein the plate springs 3, only one such spring being shown however in ~der to simplify the drawing, are subjected to tensile stress, the upper end of the spring being secured to the upper end of an upstanding 10 support member 9 on foundation 2, and the lower end of the spring being secured to the lower end of another support member 9 which depends from the housing 1. The spring structure in Fig. 5 also differs from that of Figs. 1 to 4 in that it consists o~ a multi-plicity of plates secured together such as by bolting, or welding or some other suitable means as distinguished from single-plate structures as illustrated in Figs. 1 to 4.
In conclusion, the ob~ective of the invention is not restricted to these four embodiments which have been Epecifically disclosed. It is al~o possible to apply the inventive concept in 20 combinatlon with other types of supporting components, e.g., in-clined spokes which will still further improve centerlng of the machine component and ensure its circular s~abillty under thermal expansion.
,
BACKGROUND 0~ THE INVENTION
The present invention relates to an improved arrangement for supporting the housing or bearing spider component of a rotary machine of the vertically arranged axis type such as an electrical machine, the component being expandable during operation, and being supported upon a foundation, or another component of the machine, by means Or plate springs which are arranged in at least substan-tially vertical planes beneath the housing or bearing spider.
A vertical-axis machine housing for example, which is at 10 least approximately rotationally Bymmetrical about the machine axis expands during operation, the expansion being primarily due to changes in temperature. The housing should be free to expand con-centrically with a minimum of inter-stresses between the housing and the foundation or other component on which it is supported. It has already been proposed to support the machine housing on the roundation either by bar springs under compressive stress as dis-closed in Austrian patent OE-PS 164,995, or by means of radially arranged plate springs under compressive stress as disclosed in Austrla~ patent O~-PS 229,959, or by radially arranged plate springs 20 under tenslle stress, as disclosed in Swiss patent CH-PS 530,109.
These structural Bolutlons make possible a mechanical da~ping of an alternating torque and partially also an expansion of the machine housing, but such solutlons will not ensure in a sati~factory manner malntenance Or a complete, i.e., true circularity Or the housing.
ml8 18 especially so in the case of machines of large slze. Ger-man patent DT-GM 1,914,702 descrlbes and lllustrates a dirferent type Or support structure in whlch the machine housing is secured to its support by means of springs which yield in the radlal direction but are rlgld in a tangential dlrectlon. H~wever, thls solution 30 again meets only the requlrement Or rree houslng expansion, ln this case the stator component Or an electrical machine, but without r - 2 -., ., ,.,. _ . ,. - ~ ~ . , .
. . . . . . ~ . , 11)5~89 ..
ensuring maintenanc~e of complete circularity of the stator during operation of the machine.
SUMMARY OF THE INVENTION
The present invention is concerned primarily with the problem of establishing an arrangement for supporting the housing or bearing spider component of a vertical-axis type machine which expands during operation, which will ensure not only complete free-dom of thermally induced expansion but also maintenance of complete circularity. If the inventive concept is utilized for a rotary 10 vertical-axis electrical machine, it is desired that the support also ensure satisfactory damping of forces generated by short-cir-cuit condition~ within the machlne.
In accordance with the invention, these problems are :
solved by means of a plate spring type of support wherein the springs are located in at least sub6tantially vertical planes and wherein the respective planes in which the springs are located lie r tangent to the surface of an imaginary cylinder coaxlal with the axls of the machine component, the radlus of æaid cyllnder being smaller than the mean radlal dlstance of the plate springs ~rom 20 the axis of the machine component.
It 18 a partlcular advantage of the invention that the specific arrangement of the plate spring support makes possible a free thermal expansitivity of the housing or bearing splder Or a rotary vertical-axis electrical machine and ensures also a stabi-lized, true clrcularlty of the component as well as damping for any short-circuit lnduced forces.
It is partlcularly advantageous to arrange the plate sprlngs 80 that they are sub~ected to a compressive gtress by the weight of the component belng supported. mis design i~ very 30 simple from a standpoint of engineering design practlce and ful-fills its task in most instances. Another embodiment is possible wherein the plate springs are sub~ected to tensile 6tress by the ~ 3 --':
, . , ~
~059489 weight of the machine component. This latter solution is partic, ularly advantageous for ingle-phase electrical machines be-,cause the plate springs under tensile stress are able to deflect widely in case of a terminal short-circuit.
It is further advantageous to design the springs in the form of a multiple-plats structure. The thickness of the individual plates is selected in such manner that the maximum per-missible bending stress of the material is not exceeded.
In accordance with one embodiment of the invention, the 10 plate springs supporting the machine housing are arranged individ- ;
ually in a circle about the axis of the machine housing and upstand on the foundation. In another embodiment the plate springs are structurally associated with the arms of a load bearing spider, the spider being connected by the springs to the foundation or to the machine housing. The spider ensures proper centering and permits a relative expansion within the machine parts.
BRIEF DESCRIPTION OF THE DRAWINGS
Th~ accom~nying drawings illustrate four practical embodlment~ of the invention in somewhat schematlc form.
Fig. l ls a front elevatlon of one embodlment of the invention wherein the machine housing is supported upon a foundation by means of a circular array of plate springs in vertical planes and sub-~ectlon to compresslve stress by the weight of the housing; -~
Fig. 2 is a transverse section taken on line ~ -II-II of Fig. l;
Fig. 3 ls a view in elevation of two other embodiments of the inventlon wherein the plate sprlngs ln vertical planes are structurally combined with the the arms of a support spider for securlng the spider to a foundatlon or to the machlne houslng;
., . , . . - , , ~ , . , ~ , . . .
- ~V~948 ~:
Fi~. 4 is a transverse section taken on line IV-IV of Fig. 3; and Fig. 5 is a view in elevation of still another embodlment of the invention wherein the plate springs in vertical planes are sub~ected to ten~ile stress by the weight of the machine housing. ~ -With reference now to Figs. l and 2, which illustrate -;
in principle one embodiment of the invention, the housing 1 of the vertical-axis machine is seen to be supported upon a founda-10 tion 2 by means of a circular array of plate springs 3, 3' located respectively in vertical planes 5 and which are subJected to com-pressive stress by the weight of the housing. Fig. 1 shows only the three springs 3 located at the front portion of the housing.
All of the springs are h~wever included in Fig. 2. m e vertical planes 5 are all seen to lie tangent to one and the same imaginary cylinder 4 located co-axially with the axis of the machine housing l, the radius of said cylinder being smaller than the mean radial dlstance of the springs from the axis of the machine housing. The plate sprin~6 3, 3' form acute angles with the radial direction.
20 In the case where the expansion of the machine houslng 1 is rota-tlonally symmetrical, the radial forces acting upon the plate springs 3, 3' wlll divlde into two components. The component act-ing within plane 5 will cause a practically insignificant deforma-tlon of the plate springs. m e other component which is perpendi- ;
cular to the plane 5 will, however, cause a relatively great move-ment of the plate springs. m e radial expansion o* the machine housing is thus converted to torslon, and a stability of its cir-cular shape is ensured even in the case of an asymmetrical expan-sion or mechanical stress.
Obviously, the plate springs 3, 3' need not be placed directly between the machine housing 1 and its foundation 2. In accordance with two other embodiments illustrated in Figs. 3 and 4, ,: , ' , ~.o59489 the plate springæ ~ support a load-bearing spider structure con-sisting of a hub 6, four radially directed arms 7 extending at right angles from the hub, and beams 8 which interconnect the outer ends of the arms 7, at the machine housing 15 or at the foundation 2 Fig. 5 illustrates a third embodiment wherein the plate springs 3, only one such spring being shown however in ~der to simplify the drawing, are subjected to tensile stress, the upper end of the spring being secured to the upper end of an upstanding 10 support member 9 on foundation 2, and the lower end of the spring being secured to the lower end of another support member 9 which depends from the housing 1. The spring structure in Fig. 5 also differs from that of Figs. 1 to 4 in that it consists o~ a multi-plicity of plates secured together such as by bolting, or welding or some other suitable means as distinguished from single-plate structures as illustrated in Figs. 1 to 4.
In conclusion, the ob~ective of the invention is not restricted to these four embodiments which have been Epecifically disclosed. It is al~o possible to apply the inventive concept in 20 combinatlon with other types of supporting components, e.g., in-clined spokes which will still further improve centerlng of the machine component and ensure its circular s~abillty under thermal expansion.
,
Claims (11)
1. In a support structure for a component of a ver-tical-axis machine which is expandable under operating conditions due to generation of heat the improvement where, in order to main-tain a stabilized circularity of said component during thermal expansion, said support structure comprises a system of plate springs arranged in substantially vertical planes and wherein the respective planes in which said springs are located lie tangent to the surface of at least one imaginary cylinder coaxial with the axis of said component, the radius of said cylinder being smaller than the mean radial distance of the inner fixing respectively clamping points of the plate springs from the axis of said component.
2. A support structure for a component of a vertical-axis machine as defined in claim 1 wherein said plate springs are subjected to compressive stressing.
3. A support structure for a component of a vertical-axis machine as defined in claim 1 wherein said plate springs are subject to tensile stressing.
4. A support structure as defined in claim 1 wherein said vertical-axis machine component is a circular housing and wherein the upper end of each plate springs is secured to the upper end of an upstanding support member on a foundation for said mach-ine, the lower end of said plate spring being secured to the lower end of another support member which depends from said housing thereby subjecting said springs to tensile stress.
5. A support structure for a component or a vertical-axis machine as defined in claim 1 wherein said plate springs each consist of at least two plate spring members secured together.
6. A support structure as defined in claim 1 wherein said vertical-axis machine component is a bearing spider.
7. A support structure for a bearing spider com-ponent of a vertical-axis machine as defined in claim 6 wherein said plate spring are located at the outer ends of the arms of said spider.
8. A support structure for a bearing spider component of a vertical-axis machine as defined in claim 7 where a pair of said plate springs is located at the outer end of each arm of said spider.
9. A support structure as defined in claim 1 wherein said vertical-axis machine component is a bearing spider and said plate springs extend between said spider and the machine foundation.
10. A support structure as defined in claim 1 wherein said vertical-axis machine component is a bearing spider and said plate springs extend between said spider and a circular housing of the machine.
11. A support structure for a component of a verti-cal-axis machine as defined in claim 1 wherein said plate springs are located in a circular array and all of which lie tangent to the same imaginary cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA277,026A CA1059489A (en) | 1977-04-26 | 1977-04-26 | Arrangement for supporting vertical-axis machine housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA277,026A CA1059489A (en) | 1977-04-26 | 1977-04-26 | Arrangement for supporting vertical-axis machine housing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059489A true CA1059489A (en) | 1979-07-31 |
Family
ID=4108504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA277,026A Expired CA1059489A (en) | 1977-04-26 | 1977-04-26 | Arrangement for supporting vertical-axis machine housing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1059489A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5117140A (en) * | 1991-05-13 | 1992-05-26 | Westinghouse Electric Corp. | Stator stabilizing assemblies |
-
1977
- 1977-04-26 CA CA277,026A patent/CA1059489A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5117140A (en) * | 1991-05-13 | 1992-05-26 | Westinghouse Electric Corp. | Stator stabilizing assemblies |
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