WO2012041900A1

WO2012041900A1 - High-temperature superconductor (hts) machine having a supporting element for thermally separating a warm assembly and a cold assembly

Info

Publication number: WO2012041900A1
Application number: PCT/EP2011/066855
Authority: WO
Inventors: Harald Müller
Original assignee: Siemens Aktiengesellschaft
Priority date: 2010-09-29
Filing date: 2011-09-28
Publication date: 2012-04-05
Also published as: DE102010041645A1

Abstract

The invention relates to a high-temperature superconductor (HTS) machine (1), comprising a warm assembly (20) and a cold assembly (30), which rotate about a common longitudinal axis (50) during operation of the HTS machine and are thermally separated from each other by a supporting element (10). A first end (12) of the supporting element (10) is coupled to the warm assembly (20) and a second, opposite end (13) of the supporting element (10) is connected to the cold assembly (30) in a stationary manner. The first end (12) is coupled to the warm assembly (20) by means of at least one axial spring element (40).

Description

description

High-temperature superconductor (HTS) machine with a support element for thermal separation of a hot and a cold assembly

The invention relates to a high - temperature superconductor (HTS) machine with a hot assembly and a cold construction ^¬ group, which rotate about a common longitudinal ^¬ axis at the same speed during operation of the machine and are thermally separated from each other by a support member. A first end of the support member is coupled to the warm assembly. A second, opposite end of the support member is fixedly connected to the cold assembly.

High temperature superconductor machines are also referred to as HTS machines. For example, HTS machines are used as power generators or motors in off-shore applications and ships. An HTS machine has an operating temperature of -243 ° C, whereby in a high magnetic field a current density of over 150 A / m ² can be achieved. Thanks to the 30- to 80-fold higher current density compared to conventional electrical machines, compact coils can be built for the rotor of a machine. As a result, the efficiency can be significantly increased and the weight and volume of the entire machine can be reduced.

In a HTS machine, the installation space, the so-called B side, is separated from the so-called cold side, ie a cold assembly, toward the hot side, ie a warm assembly, by a so-called support element. The supporting element comprises a tube of glass ^¬ fiber reinforced plastic (GRP) and provides the interface of the ^¬ le is between cold and hot assembly. The pipe of fiberglass provides thermal separation of cold and warm construction ^¬ group. The support element is fixedly connected to the cold assembly, such as a pole core, via a flanged steel ring. At the other end, the support element is fixed with a clearance fit to the warm assembly, with the "fi "takes place xation with a clearance fit to the shaft crossing a shaft by means of a centering ring in the shaft. shafts ^¬ transition, and shaft components of the hot module. This fit is subjected to axial sliding due to the rotation of the components of warm and cold assembly. occurs due to the friction a wear of the clearance.

It is endeavored to form the fit by suitable materials to give rise to a "controlled wear", however, there is no practical experience, so it is not known at what intervals a revision of the fit of the HTS machine must be made.

It is therefore an object of the present invention to provide a HTS machine, can be avoided in the wear phenomena in the transition region from support element to warm assembly.

This object is achieved by an HTS machine according to the features of claim 1. Advantageous ^{Ausgestaltun ¬} conditions emerge from the dependent claims.

The invention provides a high-temperature superconductor (HTS) machine with a warm assembly and a cold construction ^¬ group, which rotate during operation of the HTS machine about a common longitudinal axis and are thermally separated from each other by a support member. The cold assembly includes a pole core of the HTS machine. A first end of the support element is coupled to the warm assembly. A second, ^{opposite ¬} overlying end of the support member is ^fixedly connected to the cold construction ^¬ group. According to the invention the first end is coupled via at least one axial spring element with the warm construction ^¬ group.

By using an axial spring element axial movements of the support element relative to the hot assembly can be done freely and without abrasion. At the same time, this ensures axial spring element for a centric fixation of support ^¬ element and warm assembly to each other. Since no friction and thus no wear of the previously used snug fit occur due to the use of the axial spring element according to the invention, no temporally undefined revisions are required in this transition region between the support element and the hot assembly. Rather, the axial spring element ensures a permanent coupling for the thermal separation of hot and cold assembly of the HTS machine.

In an advantageous embodiment, the axial spring element comprises a first and a second component and a spring ^¬ part. The first component may be formed in the form of an outer spring ^¬ ring and the second component in the form of an inner spring ^¬ ring. The first component is firmly connected to the hot assembly and the second component fixed to the support ^¬ element. The spring member connects the first and the second component with respect to the longitudinal axis of the HTS machine axi ^¬ al displaceable. The structure of the axial spring element gestat ^¬ tet it, the first and second component, ie to move the outer and inner spring ring, in the axial direction to each other. Such a shift can occur during operation of the HTS machine by design. Since both the first and the second component are each firmly connected to the warm assembly or with the support element, an abrasion-free connection is created.

Characterized in that the first and the second component of the axial spring element are arranged concentrically to one another and to the support element, a centric fixation of Stützele ^¬ ment and warm assembly is ensured to each other.

According to a further expedient embodiment the first component of the axial spring element along its environmental fangs on at least three equidistantly distributed, first puncturing ^¬ th comprises a connection to the spring member. The second component of the axial spring element comprises along its circumference to at least ^¬ three equidistantly distributed, second points likewise if connected to the spring member, with the second points being provided between the first points. By the selective connection of the spring member to the first and the second component, the desired axial shift Ver ^¬ on the one hand ensured. On the other hand, the punctual connection ensures a defined arrangement of support element and warm assembly to each other. The number of first and second points is preferably the same and is four, for example.

It is also expedient if the first component and the spring part and / or the second component and the spring part are connected to each other by a positive connection. This allows the axial spring element in a simple manner together and install in the HTS machine. For this purpose it can be provided that the first and / or the second component comprise a jewei ^¬ celled groove in which engages the spring member selectively.

The design and dimensioning of the axial spring element is such that the first and the second component of the axial spring element in the axial direction between 0.05 mm and 0.1 mm are mutually displaceable. A suitable dimensioning of the individual components is dependent on the geometric dimensions of the HTS machine, in particular a diameter of the support element and the dimensions of the hot assembly in the region of the coupling of the first end of the support element. The dimensioning of the individual components can be ermit ^¬ telt easily by tests or by calculation.

It is also expedient if the axial spring element is formed from a spring steel. This has good elasticity and stability due to its properties.

In a further expedient embodiment, the first end of the support element comprises a fastening ring, which is connected to the second component of the axial spring element, in particular by a positive connection. Next is vorgese ^¬ hen that the support element is a tube made of glass fiber reinforced Plastic (GRP) comprises, which is connected at the first end via the first and at the second end via a second fastening ring with the hot and the cold component. The mounting rings are made of steel, for example.

In a further concrete embodiment, the first component of the spring element is connected to an outer ring of the warm construction ^¬ group, in particular via a positive connection. The outer ring may also be formed of steel.

Not only the components of the axial spring element itself are preferably positively connected to each other. It is also provided to contact the axial spring element positively with its connection partners.

The invention is described in more detail below with reference to an exporting ^¬ approximately example. Show it:

Fig. 1 is a schematic representation of a part of a

HTS machine, which illustrates the thermal separation of a hot assembly from a cold assembly by a support member,

Fig. 2 is a plan view of an inventively ^¬ tes axial spring element for coupling the Stützele ^¬ ment with the warm assembly of the HTS machine, and

Fig. 3 is a perspective, sectional view

two inventive axial spring elements in a mounting situation.

1 shows a schematic cross-sectional representation of a high-temperature superconductor (HTS) machine 1. The HTS machine 1 comprises a hot assembly 20 (not shown in detail), which, inter alia, comprises a shaft seat. The reference numeral 30 a not detailed running cold ^¬ construction group 30 is shown, which in addition to other components a Polkern comprises. The components of the hot assembly 20 and the cold assembly 30 rotate about a common longitudinal axis 50. The designated ^¬ by the reference numeral 31 ^¬ part 31 of the cold component 30 and the designated by the reference numeral 22 stub shaft of the warm member 20 are therefore rotationally symmetrical , The Drehbewe ^¬ tion of the component is carried out at the same speed.

Reference numeral 10 is a thermally separated from each other the hot assembly 20 and the cold assembly 30

Support element 10 marked. The support member 10 comprises a glass fiber reinforced plastic (GRP) existing pipe 11, at its first, the warm assembly 20 facing the end 12 a first steel ring 14 and on whose second, the cold assembly 30 facing end 13 a second

Steel ring 15 is arranged. The GFRP pipe 11 and the steel rings 14, 15 flanged to the opposite ends 12, 13 form as a unit the support element 10. The first and the second steel ring 14, 15 each have a groove for receiving the GRP pipe 11. The steel ring 15 is fixedly connected to the housing ^¬ part 31 of the cold assembly. The provided at the first end 12 steel ring 14 is coupled in accordance with the invention via an axial spring element 40 with an outer ring 21 of the hot assembly 20. The existing example of steel outer ring 21 is in turn firmly connected to the stub shaft 22 of the hot assembly 20.

Upon rotation of hot assembly 20 and cold assembly 30, slight axial movement of support member 10 fixedly connected to cold assembly 30 relative to hot assembly 20 occurs. This relative movement is due on the one hand by the structural design of the HTS machine and the very different temperatures of hot and cold assembly, with the support element 10 a far-reaching thermal decoupling zwi ^¬ rule cold and warm assembly is guaranteed. The task of the axial spring element 40 is to be in this coupling area between warm assembly 20 and support element 10 there is no friction and hence no abrasion entste ^¬ hen. Although the axial spring element 40 provides ^¬ for a firm, defined "connection" of Stützele ^¬ ment 10 and warm assembly 20, but on the other hand allows an axial movement of the two components to each other, without causing abrasion.

In Fig. 2 a top view of a schematic depicting ^¬ lung of a single axial spring element of the invention 40 is shown, wherein the coupling of support element 10 and a warm assembly 20 can in principle also be carried out over a plurality of such axial spring elements 40.

The axial spring member 40 as the first component comprises 41 egg NEN outer spring ring, is disposed concentrically in ^¬ nerer spring ring to the second component as the 42nd The outer spring ring 41 is firmly connected at least in the axial direction to the outer ring 21 of the hot assembly 20. The firm connection is preferably made duroh a positive connection by the outer spring ring 41 is inserted into a corresponding groove of the outer ring 21.

In a corresponding manner, the inner spring ring 42 is fixed at least in the axial direction, preferably in turn via a positive connection, connected to the steel ring 14 of the support member 10 in the region of its first end 12. Also, the steel ring 14 has this purpose a corresponding groove for receiving the in ^¬ neren spring ring 42. This can be taken, moreover, the cut, perspective view of FIG. 3.

The inner and outer spring ring are axially ver ^¬ pushed connected via a spring member 43 with respect to the longitudinal axis 50 of the HTS machine. For this purpose, the spring member 43 is connected to example ^¬ four points 41-1, 41-2, 41-3 and 41-4 along its circumference with the outer spring ring 41. The connection preferably takes place again via a positive connection, by appropriate, the outer spring ring 41 facing Wöl ^¬ exercises in an associated groove of the outer spring ring 41 a ^¬ grab, wherein the groove is circumferentially formed in the outer spring ring. The first points 41-1, 41-2, 41-3 and 41-4 are preferably distributed equidistantly over the inner circumference of the outer spring ring 41.

Furthermore, the spring part 43 at four points 42-1, 42-2, 42-3 and 42-4 on a connection to the inner spring ring 42 on. The number of second points is selected corresponding to the number of first points, the number can also be chosen differently. The second points are distributed over the outer circumference of the inner spring ring such that they are respectively centered between two first points 41-1 and 41-2 and 41-2 and 41-3 and 41-3 and 41-4 and 41st -4 and 41-1 come to rest. The connection of the second points 42-1, 42-2, 42-3, 42-4 to the inner spring ring 42 is also preferably via a form-fitting reali ^¬ Siert. For this purpose, the inner spring ring 42 has an associated groove along its outer periphery.

The components 41, 42 and 43 of the spring element 40 are preferably formed from ^¬ a spring steel. Due to the selective fixation of the spring member 43 to the outer spring ring 41 and to the inner spring ring 42, an axial displaceability of the inner spring ring 42 is secured to the outer spring ring 41. It is sufficient if the axial sliding movable ^¬ ness between 0.05 mm and 0.1 mm. At the same time, it is ensured by the shape of the spring part 43 and the ^¬ sen selective connection to the outer and inner spring ring 41, 42 that the spring rings, regardless of their axial relative position to each other, are always centered fixed to each other. This ensures that the support element 10 can move in the region of its first end 12 without friction and without abrasion relative to the hot assembly 20. 3, by way of example, two spring elements 40, which are arranged at a distance from one another, are shown in a mounting situation. It can be clearly seen that the outer spring rings 41 are connected to the outer ring 21 of the hot assembly 20. Since the cut is made in the region of the 12 o'clock position of the spring elements, there is also a connection to the first point 41 - 1 of the spring part 43 in this area. Accordingly, the spring parts 43 are arranged in the region of the 12 o'clock position at a distance from the respective inner spring rings 42. The inner spring rings 42 are, as is readily apparent from Fig. 3, embedded in a groove of the first steel ring 14 of the support member 10. For clarity, the axially provided in the steel ring 14 groove for connection to the GRP pipe 11 is omitted.

The coupling of the support element and the hot assembly according to the invention enables a firm centering of the two components relative to one another, whereby an axial movement can, however, take place unhindered and without abrasion. As a result, wear-related revision cycles of the HTS machine can be reduced or avoided.

Claims

claims

1. High-temperature superconductor (HTS) machine (1) with a hot assembly (20) and with a cold assembly (30), which rotate during operation of the HTS machine about a common longitudinal axis (50) and by a supporting element (10 ) are thermally separated from each other, wherein a first end (12) of the support ^¬ elements (10) coupled to the hot assembly (20) and a second, opposite end (13) of the support member (10) with the cold assembly (30) stationary is connected, characterized in that the first end (12) via at least ^¬ an axial spring element (40) with the warm assembly (20) is coupled.

2. Machine according to claim 1, characterized in that the axial spring element (40) comprises a first and a second building ^¬ part (41, 42) and a spring member (43), wherein the first component (41) fixed to the hot assembly (20) and the second component (42) are fixedly connected to the support element (10) and wherein the spring member (43) the first and the second

Component with respect to the longitudinal axis of the HTS machine axially ver ^¬ slidably connects.

3. Machine according to claim 2, characterized in that the first and the second component (41, 42) of the axial spring ^¬ elements (20) concentric with each other and to the support element (10) are arranged.

4. Machine according to claim 2 or 3, characterized in that the first component (41) of the axial spring element (20) along its circumference at least three equidistantly distributed ^¬ th, first points (41-1, 41-2, 41-3 , 41-4) comprises a connection to the spring part (43).

5. Machine according to one of claims 2 to 4, characterized in that the second component (42) of the axial Federele ^¬ ment (20) along its circumference at least three equidistant ^¬ tant distributed, second points (42-1, 42-2 , 42-3, 42-4) a connection to the spring part (43), wherein the second points (42-1, 42-2, 42-3, 42-4) between the first points (41-1, 41-2, 41-3, 41- 4) are provided.

6. Machine according to one of claims 2 to 5, characterized in that the first component (41) and the spring member (43) and / or the second component (42) and the spring member (43) are interconnected by a positive connection.

7. Machine according to claim 6, characterized in that the first and / or the second component (41, 42) comprise a respective groove in which the spring member (43) selectively engages.

8. Machines according to one of claims 2 to 7, character- ized in that the first and the second component (41, 42) of the axial spring element (40) in the axial direction between 0.05 mm and 0.1 mm are mutually displaceable ,

9. Machine according to one of the preceding claims, characterized in that the axial spring element (40) consists of a

Spring steel is formed.

10. Machine according to one of the preceding claims, characterized in that the first end (12) of the support element (10) comprises a fastening ring (14) which with the second component (42) of the axial spring element (40), in particular ^¬ special a positive connection, is connected.

11. Machine according to one of the preceding claims, characterized in that the support element (10) comprises a tube (11)

GFK, which is connected via the first and a second fastening ring (14, 15) with the hot and the cold component (20, 30).

12. Machine according to one of the preceding claims, characterized in that the first component (12) of the spring element with an outer ring (21) of the hot assembly, in particular via a positive connection, is connected.