WO2018015106A1

WO2018015106A1 - Stiffened contact bar

Info

Publication number: WO2018015106A1
Application number: PCT/EP2017/065633
Authority: WO
Inventors: Simon Bubel; Erik D Taylor
Original assignee: Siemens Aktiengesellschaft
Priority date: 2016-07-20
Filing date: 2017-06-26
Publication date: 2018-01-25
Also published as: EP3465719A1; DE102016213294B4; CN109478481B; EP3465719B1; CN109478481A; DE102016213294A1

Abstract

The invention relates to a contact bar (1) for a switch, comprising a first contact bar region, which has a first contact bar material (11), which extends from a first end segment of the contact bar to a second end segment of the contact bar, wherein the second end segment of the contact bar (1) adjoins a contact body (2) or transitions into said contact body and the first contact bar region, which has the first contact bar material, is hollow and thus forms a first cavity (15) and a second contact bar material (12) is inserted into the first cavity (15), wherein the second contact bar material (12) is stiffer than the first contact bar material (11).

Description

description

The invention relates to a stiffened contact rod, in particular a stiffened contact rod for vacuum switch ^¬ tubes, and to a method for producing such a stiffened contact rod, in particular for vacuum interrupters.

Contact rods are known from the prior art, in particular ^¬ special contact rods for vacuum interrupters, which are formed due to the good electrical and thermal conductivity of copper. With long contact bars and with expected high mechanical stresses, there can be considerable problems with the dimensional stability of the contact bars. Since in particular in the production of vacuum interrupters a closure brazing takes place, in which the contact rod is soldered with ver ^¬ or is at least heated, it comes with the contact rods made of copper to an unavoidable soft annealing of the contact rods.

Thus, in particular with long contact bars, there is potential for improving the dimensional stability.

In order to meet the high mechanical and electrical requirements, additional designs of contact rods are used, which have an enlarged diameter. However, this also entails a considerable increase in the weight of the contact staff. Due to this increase in the masses, in particular the moving masses in a moving contact, and the larger designs that have a significant impact on the design of many components used in a switching device, such as drive, drive kinematics, energy storage and carrying and insulating elements, additional costs , The prior art attempts to counteract this problem by stiffening the contact rods, for example by means of over ^¬ throw tubes made of stainless steel, or forms the contact rod completely made of stainless steel. With these solutions, however, the ohmic heating of the contact bars is increased. This is partly due to the reduced AC conductivity due to the high magnetic permeability of the steel and the reduction of the copper content at the contact rod. In addition, the use of steel pickguard tubes leads to a deterioration of heat dissipation from the contact rod.

The object of the invention is therefore to remedy the disadvantages of the prior art and to provide a stiffened contact rod with high thermal and electrical conductivity.

This object is solved by the independent claims 1 and 12.

In one embodiment, the contact rod for a switch has a first contact rod portion with a first contact rod material. The first contact rod material ER- extends in the first contact bar area of a first end portion of the contact rod to a second Endab ^¬ section of the contact bar, wherein the second end portion of the contact rod is adjacent to a contact body or merges into it. The first contact with the first rod portion is con- tact rod material made hollow and thus forms a ^¬ ers th cavity. In the first cavity, a second contact rod material is introduced, which forms a second Kontaktstabbe ^¬ rich, wherein the second contact bar material is stiffer than the first contact rod material. The term "stiffer" in the context of this application refers to the mechanical stiffness of a material, ie also to the flexural rigidity, the torsional rigidity and / or expansion stiffness. accuracy. For example, steel has a higher rigidity than copper.

It is particularly preferred that the second contact rod material is at least 1/6 stiffer, more preferably by 1/3 stei ^¬ fer than the first contact rod material.

It is preferred that the first contact rod portion with the first contact rod material has the shape of a cylinder or hollow cylinder or partially hollow cylinder. Of the

Hollow cylinder, in particular in the hollow region, ie in the inner region, also have one or more steps and / or have sloping surfaces which form such conically converging and / or conically diverging structures in the inner region of the hollow cylinder. It should be understood that convergence means that the surfaces do not have to touch during convergence, but they can.

Further, it is preferable that the second contact rod portion is formed with the second contact rod material as a cylinder or hollow cylinder or partially hollow cylinder.

It is particularly preferred that the outer side of the second contact rod region is designed with the second contact rod material such that the second contact rod material can be inserted or pressed into the first contact rod material. In particular, it is preferred that the outer shape of the second contact rod region with the second contact rod material completely or partially nachbil ^¬ det the shape of the first cavity of the first contact rod portion with the first contact rod material.

It is also preferred that the second contact bar material Alu ^¬ minium, an aluminum alloy, steel, stainless steel, an art is material and / or reinforced with carbon nanotubes metal. In particular, it is also preferred that the second contact ^¬ rod material is a reinforced plastic, such as a glass fiber reinforced plastic or reinforced with metals plastic.

It is also preferred that the first cavity in the first end portion opens and / or the first cavity into the two ^¬ th end portion opens. It is further preferred that the first cavity opens into the first end section such that the second contact ^{rod material can be} inserted or pressed in through the opening into the first contact rod region with the first contact rod material. In this case, under pressing is to be understood not only the purely mechanical pressing see, but also an injection of a injectable material, particularly a Kunststof ^¬ fes and / or reinforced plastic, to be understood in the first cavity. It is also preferred that the second contact rod material completely or partially fills the first cavity of the first contact rod material.

It is also preferred that the second contact rod material is fixed in the first cavity of the first contact rod material. Alternatively, the second contact bar material may also be introduced only into the first contact rod material or introduced without directly buildin ^¬ is saturated when the first contact rod material. Indirect attachment is possible through the connection of the first contact rod material with other components of the switch, but not necessary.

It is further preferred that the second contact rod material be secured in the first cavity of the first contact rod material by means of insertion or screwing or gluing or soldering or welding or riveting or at least one combination of the foregoing. It is also preferred that the second contact rod region has a second cavity with the second contact rod material. It is also preferred that in the second cavity, a third contact rod material is provided, which has a higher electrical ^¬ specific conductivity and / or thermal conductivity than the second contact bar material. It is further preferred that the third contact rod material is a twisted conductor material.

In particular that the twisted Leitungsma ^¬ TERIAL is formed of copper is preferred. In other words, it is preferred that the twisted line material is a twisted copper line.

Another embodiment is a method for Her ^¬ provide a contact rod, the contact rod having a first contact rod portion having a first contact rod material of to a second end of the contact rod he stretches ^¬ from a first end portion of the contact ^¬ rod. In this case, the second end portion of the contact rod is connected or connectable to a contact body. The first contact rod portion with the first contact rod material is hollow and thus forms a first cavity and / or a first cavity is created or formed by machining. In the first cavity, a second contact ^¬ rod material is introduced and forms a second contact rod area. The second contact rod material is stiffer than the first contact rod material. So the second Kontaktstabma ^¬ TERIAL has a higher rigidity. It is particularly preferred that the second contact rod material is at least 1/6 stiffer, more preferably 1/3 stiffer than the first contact rod material.

Also preferred is a method for producing a contact rod, wherein the second contact rod material is aluminum, an aluminum alloy, steel, stainless steel, plastic and / or carbon nanotube reinforced metal. In particular, it is also preferred that the second contact ^¬ rod material is a reinforced plastic, such as a glass fiber reinforced plastic or reinforced with metals plastic. It is further preferred that the first cavity opens into the first end portion and / or the first cavity opens into the two ^¬ th end portion.

It is also preferred that the first cavity opens into the first end portion and that the second contact rod material is introduced or pressed through the mouth in the first contact rod portion with the first contact rod material.

It is also preferred that the second contact rod material is secured in the first cavity of the first contact rod region with the first contact rod material.

It is further preferred that the second contact rod material be secured in the first cavity of the first contact rod region with the first contact rod material by means of press-fitting or screwing or gluing or soldering or welding or riveting or combinations thereof.

Also preferred is a method in which the second contact rod region has a second cavity with the second contact rod material.

In particular, it is preferred that in the second cavity, a third contact rod material is introduced or pressed, which has a higher electrical conductivity and / or thermal conductivity than the second contact rod material. It is also preferred that the third contact rod material is a twisted line material and this twisted Lei ^¬ treatment material is inserted or pressed into the second cavity.

It is particularly preferred that the twisted Leitungsma ^¬ TERIAL is a twisted copper line.

The invention will be explained below with reference to figures.

Figure 1: contact rod with contact body from the state of

Technology;

Figure 2: contact rod with a stainless steel sleeve of the prior art;

3 shows an exemplary embodiment of an inventive con ^¬ stroke rod with a contact body;

FIG. 4 shows an exemplary embodiment of a method according to the invention for producing a contact rod;

Figure 5: Embodiment of an inventive con ^¬ clock rod with contact body.

FIG. 1 shows a contact rod 1 which has a contact body 2 with a contact plate 3. Figure 1 is divided into two areas. The upper area A shows a

Section through the contact rod, while the second region B shows a side view of a contact body 2 with a contact sheet ^¬ 3.

The contact rod has a first diameter 5 of the first contact rod material.

The drawn longitudinal axis LA is in this embodiment ^¬ example, a rotational symmetry axis of the contact rod. 1 About the recess 17 in the contact rod 1, the contact rod can be contacted and / or attached and / or connected to another component of the switchgear. 2 shows a contact rod 1 from the prior Tech ^¬ technology that has to stiffen over an outer steel sleeve. 7 These steel sleeve 7 serves to stiffen the contact ^¬ rod made of copper 9. During a manufacturing method for such Kon ^¬ clock rod, it is advantageous if during the Verschlusslö ^¬ least the steel sleeve 7 or the steel sleeve 7 and the contact ^¬ rod of copper 9 having a Weight 8 are applied. FIG. 2 furthermore shows a contact body 2 with a contact plate 3 adjoining one end of the contact rod made of copper.

The contact body 2 has slits 4 for the control of potentially occurring during a switching process Lichtbö ^¬ gene. These slots 4 are preferably continued in the contact plate 3. Such slots are also shown in the other figures, but not further specified. Also, the figure 2 is divided into two areas A, B, wherein the upper portion A again shows a section through a contact rod, while the lower portion B shows a side view indicated by dashed lines internal structure of a contact body 2 with a contact plate 3.

The drawn longitudinal axis LA is a rotational symmetry axis of the contact rod ^¬. 1

3 shows an embodiment of a contact rod 1 of invention according to a secured to the second end portion of the contact rod contact body 2 having a contact ^¬ sheet. 3 FIG. 3 is again subdivided into two regions A, B, where the top section A shows the contact rod 1 ^according to the invention in a sectional view, while the section B shows a side view with an indicated internal structure of the contact body 2 with contact plate 3.

The drawn longitudinal axis LA can also be a rotational symmetry axis of the contact rod 1 in a preferred exemplary embodiment.

Alternatively, the contact rod 1 may also have a different shape from a rotary body, such as a cuboid or other geometric shapes. The contact rod 1 in the figure 3 comprises a first contact ^¬ rod material 11 in a first contact rod portion which has a cavity 15 shown in Figure 4, in which the second contact rod material 12, which forms a second contact rod ^¬ area, is introduced.

The first cavity 15 in the first contact rod material 11 here has a second diameter 14 which is smaller than the first diameter 5 of the first contact rod material 11. The second contact rod material 12 is chosen so that it has a higher rigidity than the first contact ^¬ rod material 11th

The second contact rod material 12 has, at the first end portion of the contact rod 1, a recess 13 which extends into the second contact rod material 12. The recess 13 is designed such that the opening at the first end portion is smaller than the diameter 14 of the second contact rod material 12th

The reference numerals for the first contact rod material 11 be ^¬ draw at the same time the first contact bar area and the reference numerals for the second contact rod material 12 loading at the same time also draw the second contact rod area. The first and second contact rod area are therefore not additionally marked in figures. The terms contact ^¬ rod material and contact rod area can therefore also be replaced with each other.

Particularly preferred in this example that the Ausneh ^¬ mung suitable 13, anläge the contact rod 1 with an electrical ^¬ rule contact of an electrical switch, not shown here to join and / or to hold the contact rod 1 and / or with a kinematic connect.

Particularly preferably, the recess 13 has an internal thread - not shown here - on.

4 shows a manufacturing step for an OF INVENTION ^¬ to the invention contact rod 1. Figure 4 is again divided into the two areas A, B. The upper section A shows ei ^¬ NEN section through the contact rod 1. The second area B is a side view of the contact element 2 with a contact ^¬ timing disc 3 and the direction indicated by dashed lines internal structure of the contact body.

In the example shown in the figure 4 manufacturing step, the second contact bar material 12 is inserted with a recess 13 through an opening in the first end portion of the first Kontaktstabma ^¬ terials 11 in the first cavity 15 of the first contact rod ^¬ materials. 11 To facilitate the insertion of the second contact rod material 12 into the first cavity 15 of the first contact rod material 11 to he ^¬ possible, the skilled person may provide various apparatus to allow leakage of the first present in the cavity 15 of the media, such as air. For this purpose, for example, holes or grooves in the first contact rod material 11 or in the second contact rod material 12 are suitable. Such Vorrich ^¬ lines are not shown in the figure 4. The longitudinal axis LA of the contact rod 1 shown in FIG. 4 can also be a rotational symmetry axis of the contact rod 1. FIG. 5 shows a further exemplary embodiment of a contact rod 1 according to the invention with a contact body 2 with a contact plate 3.

FIG. 5 is again divided into two areas, A and B. The upper section A is again a section through an inventive contact bar 1, whereas the lower Be rich ^¬ B shows a side view of the contact body 2, with a contact plate. 3 In the case of Figure 5, in addition to the first Kontaktstabmate ^¬ rial 11, and the second contact rod material 12 a hollow ^¬ space, hereinafter second cavity 16, on.

The second cavity 16 makes it possible that also this inner region of the contact rod 1 with a material having high thermal conductivity and electrical conductivity can be ge ^¬ filled.

FIG. 6 shows a further exemplary embodiment of a contact rod 1 ^{according to the} invention having a first contact ^rod material 11 and a second contact ^rod material 12 which has been introduced into a cavity of the first contact ^rod material 11.

Also, the figure 6 into two areas, A and B, divided, wherein the upper area A shows a section through the contact bar 1, while the lower area B is a side view of

Contact body 2 with the contact plate 3 shows, wherein the in ^¬ nere structure of the contact body 2 is indicated by dashed lines. Notwithstanding the previous examples, the contact rod 1 has a recess 18, which has a greater extent perpendicular to the longitudinal axis LA than the second contact rod material 12th

In addition, the side walls of the recess 18 on a thread 19, which serves the simplified contacting, support and / or support of the contact rod.

Alternatively and not shown here, the second contact ^¬ rod material 12 may be formed in the form of a body with two different ^¬ different extensions perpendicular to the longitudinal axis LA, so that the second contact rod material 12 both the first cavity (not shown here) in the first contact rod 11th In this case, the second contact rod material 12 in the region of the first end portion also has a recess which ^{vorzugswei ¬} se has a thread for receiving a contact, support and / or support. In such an alternative, the shape of the second contact rod material is thus formed, for example, by two or more cylinder shapes and / or hollow cylinder shapes having different diameters and / or wall thicknesses.

Reference sign list

LA longitudinal axis

A cut

B side view

1 contact rod

2 contact bodies

3 contact sheet

4 slit of the contact body, partially merging into contact plate

5 first diameter of the first contact rod material

7 steel sleeve

8 weight for the closure soldering

9 contact rod made of copper

11 first contact rod material

12 second contact rod material

13 recess in the second contact rod material

14 second diameter of the second contact rod material

15 first cavity

16 second cavity

17 recess in the contact rod

18 recess in the second contact rod material

19 female thread in the first contact rod material

Claims

Contact bar (1) for a switch having a first contact rod portion having a first contact rod material (11) extending from a first end portion of the Kon ^¬ clock rod to a second end portion of the Kontaktsta ^¬ bes, wherein the second end portion of the Kon ^¬ clock-bar (1 ) adjoins or merges with a contact body (2),

characterized in that the first contact rod portion is hollow with the first contact rod material and thus forms a first hollow ^¬ space (15) and in the first cavity (15) a second contact rod material (12) is introduced, wherein the second contact rod material (12) is stiffer as the first contact rod material (11).

Contact rod (1) according to claim 1,

characterized in that the second contact bar material (12) is aluminum, an aluminum ^¬ miniumlegierung, steel, stainless steel, a plastic and / or a reinforced with carbon nanotubes Me ^¬ is tall.

Contact rod (1) according to claim 1 or 2,

That is, the first cavity (15) opens into the first end portion and / or the first cavity (15) opens into the second end portion.

Contact rod (1) according to claim 3,

characterized in that the first cavity (15) opens in such a way in the first end portion, thus forming a mouth, that the second contact bar material (12) forming a second Kon ^¬ clock bar area, through the orifice in the first contact bar material (11) inserted or press-fitted is. Contact bar (1) according to the preceding claims, characterized in that the second contact bar material (12) the first cavity (15) of the first contact rod section with the first Kon ^¬ clock bar material (11) filled fully or partly from ^¬.

Contact rod (1) according to one of the preceding claims, characterized in that the second contact rod material (12) in the first hollow ^¬ space (15) of the first contact rod material (11) is fixed.

Contact rod (1) according to claim 6,

characterized in that the second contact rod material (12) in the first hollow ^¬ space (15) of the first contact rod material (11) by means of pressing or screwing or gluing or soldering or welding or riveting or at least a combination thereof is attached.

Contact rod (1) according to one of the preceding claims, characterized in that the second contact rod material (12) in the second contact ^¬ rod region having a second cavity (16).

Contact rod (1) according to claim 8,

characterized in that in the second cavity (16) a third contact rod material is present that has a higher electrical conductivity ^¬ ability and / or thermal conductivity than the second contact rod material (12).

Contact rod (1) according to claim 8 or 9,

characterized in that the third contact rod material is a twisted line ^¬ material. Contact rod (1) according to claim 10,

characterized in that the twisted conductor material is a twisted copper ^¬ line.

A method of manufacturing a contact bar (1), wherein the contact bar (1) having a first contact rod material (11) extending from a first end portion of the contact rod to a second end of the contact ^¬ rod and forms a first contact rod portion, said second end portion the contact rod is connectable or connected to a contact body (2),

d a d u r c h e c e n c i n e s that

the first contact rod region is made hollow and thus forms a first cavity (15) and / or a first cavity (15) is created by machining,

- In that in the first cavity (15) a second contact rod material (12) is introduced, wherein the second contact rod material (12) is stiffer than the first contact rod material (11).

Method for producing a contact rod (1) according to Claim 12,

Method for producing a contact rod (1) according to Claim 12 or 13, characterized

characterized in that the first cavity (15) opens into the first end portion and / or the first cavity (15) opens into the second end portion. Method for producing a contact rod (1) according to Claim 4,

That is, the first cavity (15) opens into the first end portion and the second contact rod material (12) is inserted or pressed through the mouth into the cavity of the first contact rod material (11).