Connecting device for connecting two housing parts of a housing of an electrical installation

Abstract

The invention relates to a connecting device (3) for connecting a first housing part (5) and a second housing part (7) of a housing (1) of an electrical installation. The connecting device (3) comprises a first connecting part (9) having at least one connecting region (23), in which the first connecting part (9) can be connected to the first housing part (5) in non-positively locking and / or cohesive fashion, and a second connecting part (10), which is connected to the first connecting part (9) by way of at least one first tension rod (19) and can be connected to the second housing part (7) directly or indirectly. The first connecting part (9) has at least one force distribution recess (41), by way of which forces acting on the first connecting part (9) via the at least one first tension rod (19) are distributed more evenly in the first connecting part (9) than without the force distribution recess (41).

Description

[0001] Description

[0002] Connecting device for connecting two housing parts of a housing of an electrical system

[0003] The invention relates to a connecting device for connecting two housing parts of an electrical system, in particular a gas-insulated switchgear.

[0004] Gas-insulated switchgear has an encapsulating housing filled with an insulating gas. Temperature fluctuations, for example heating caused by electrical currents flowing in electrical conductors in the switchgear, cause thermal expansion of the encapsulating housing. This thermal expansion in turn leads to stresses in the encapsulating housing, which can deform and damage the encapsulating housing. The encapsulating housing often has several housing sections, particularly if the switchgear has several switch panels. Adjacent housing sections are connected to one another in a gas-tight manner. A connecting device such as a compensator is often used to connect two adjacent housing sections in order to compensate for relative movements and thermal expansion of the housing sections.The connecting device is generally connected to at least one housing part by a force-locking connection, for example, by screw connections, and / or a material-locking connection, for example, by welded connections. These force-locking or form-locking connections can be subjected to loads due to relative movements and thermal expansion of the housing parts and must be designed for these loads.

[0005] WO 2009 / 147120 A1 discloses an arrangement with an encapsulation housing which has two pipe sections which can be moved linearly relative to one another. The pipe sections partially delimit a variable encapsulation volume. A channel connects the encapsulation volume to a compensation volume which can be changed inversely proportional to a change in the volume of the encapsulation volume. Due to their mobility, the pipe sections act as expansion compensation elements which reduce stresses in the encapsulation housing. However, the relative movements of the pipe sections change the encapsulation volume. Due to the compensation volume, which can be changed inversely proportional to the change in the volume of the encapsulation volume, the pressure inside the encapsulation housing can be kept approximately constant despite the change in the encapsulation volume. However, the relative mobility of the pipe sections requires corresponding seals between the pipe sections.

[0006] The invention is based on the object of specifying an improved connecting device for connecting two housing parts of a housing of an electrical installation, in particular a gas-insulated switchgear.

[0007] The object is achieved according to the invention by a connecting device having the features of claim 1 and a housing of an electrical system having the features of claim 12.

[0008] Advantageous embodiments of the invention are the subject of the dependent claims.

[0009] A connecting device according to the invention for connecting a first housing part and a second housing part of a housing of an electrical system comprises

[0010] - a first connecting part with at least one connecting area which is designed to be connected to the first housing part in a force-fitting and / or material-fitting manner, and

[0011] - a second connecting part which is connected to the first connecting part by at least one first tie rod and is arranged to be connected directly or indirectly to the second housing part, wherein

[0012] - the first connecting part has at least one force distribution recess, by means of which forces acting on the first connecting part via the at least one tie rod are distributed more evenly in the first connecting part than without the force distribution recess.

[0013] A tie rod is used here to describe any type of force transmission element.

[0014] Due to the more uniform distribution of forces acting on the first connecting part caused by at least one force distribution recess in the first connecting part, it is possible, in particular, to relieve the load on connecting regions in which the first connecting part can be connected to the first housing part in a force-locking and / or material-locking manner. The at least one force distribution recess thus enables a structurally much simpler and more cost-effective relief of such connecting regions than, for example, increasing the thickness of the first connecting part, increasing the number of connecting regions, or increasing the number of tie rod connections between the first connecting part and the second connecting part.

[0015] In particular, by means of suitably designed and arranged force distribution recesses, the load on the connecting areas can be relieved without increasing the dimensions of the connecting device or its mass.

[0016] In one embodiment of the invention, at least one force distribution recess is arranged between a connecting region and a tie rod coupling region in which the first connecting part is connected to a first tie rod. For example, at least one force distribution recess is arranged between a tie rod coupling region and the connecting region closest to this tie rod coupling region. This embodiment of the invention takes into account that the arrangement of a force distribution recess between a tie rod coupling region and a connecting region relieves the load on this connecting region by distributing forces, for example, between this connecting region and neighboring connecting regions.

[0017] In a further embodiment of the invention, at least one connecting region has a connecting recess for a screw, through which the first connecting part can be connected to the first housing part in a force-fitting manner. This embodiment of the invention is therefore directed to a connecting device whose first connecting part is connected to the first housing part by screw connections.

[0018] In a further embodiment of the invention, the connecting device comprises a bellows arrangement designed to connect the two housing parts in a gas-tight manner. This embodiment of the invention is aimed in particular at connecting two housing parts of an encapsulating housing of a gas-insulated switchgear assembly. The bellows arrangement enables a gas-tight connection of the two housing parts in the manner of a compensator, which compensates for relative movements and thermal expansion of the housing parts.

[0019] In a further embodiment of the invention, the connecting device has a third connecting part and a fourth connecting part, wherein

[0020] - the third connecting part is arranged between the first connecting part and the second connecting part, the second connecting part is arranged between the third connecting part and the fourth connecting part and the fourth connecting part is arranged to be connected to the second housing part, and wherein

[0021] - the bellows arrangement comprises a first bellows, a second bellows and a third bellows, wherein

[0022] - the first bellows is arranged between the first connecting part and the third connecting part and is connected to the first connecting part and the third connecting part in a gas-tight manner,

[0023] - the second bellows is arranged between the third connecting part and the second connecting part and is connected to the third connecting part and the second connecting part in a gas-tight manner, and

[0024] - the third bellows is arranged between the second connecting part and the fourth connecting part and is connected to the second connecting part and the fourth connecting part in a gas-tight manner. The second bellows preferably has a larger inner diameter than the first bellows and the third bellows. For example, the square of an inner diameter of the second bellows is at least approximately equal to the sum of the squares of an inner diameter of the first bellows and an inner diameter of the third bellows. The third connecting part and the fourth connecting part are connected, for example, rigidly, in particular by at least one second tie rod.

[0025] The aforementioned embodiments of the invention implement an embodiment of the connecting device as a compensator with three bellows arranged one behind the other. If, in the case of a rigid connection of the third connecting part and the fourth connecting part, the distance between the first connecting part and the fourth connecting part increases, for example, the volumes enclosed by the two outer bellows (the first bellows and the third bellows) increase, while the volume enclosed by the middle (second) bellows decreases. By connecting these volumes, pressure equalization between these volumes can be achieved. In order to keep the pressure as constant as possible, the middle bellows preferably has a larger inner diameter than the two outer bellows.

[0026] In order to connect volumes enclosed by the bellows to one another, in a further embodiment of the invention, the third connecting part has at least one through-hole that connects a volume enclosed by the first bellows with a volume enclosed by the second bellows. Accordingly, in a further embodiment of the invention, the second connecting part has at least one through-hole that connects a volume enclosed by the second bellows with a volume enclosed by the third bellows.

[0027] In order to connect volumes enclosed by bellows and housing parts to one another, in a further embodiment of the invention the first connecting part has at least one through-hole which is designed to connect a volume enclosed by the first bellows with a volume enclosed by the first housing part. Accordingly, in a further embodiment of the invention the fourth connecting part has at least one through-hole which is designed to connect a volume enclosed by the third bellows with a volume enclosed by the second housing part.

[0028] A housing according to the invention for an electrical system comprises a first housing part, a second housing part, and a connecting device according to the invention connecting the first housing part and the second housing part. For example, the electrical system is a gas-insulated switchgear.

[0029] The above-described properties, features, and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more readily understandable in connection with the following description of exemplary embodiments, which are explained in more detail in connection with the drawings. Therein: FIG. 1 shows a partially sectioned side view of an exemplary embodiment of a housing of an electrical system with an exemplary embodiment of a connecting device for connecting two housing parts of the housing,

[0030] FIG 2 is a front view of the connecting device shown in Figure 1.

[0031] Corresponding parts in the figures are provided with the same reference symbols.

[0032] Figure 1 (FIG. 1) shows a partially sectioned side view of an exemplary embodiment of a housing 1 of an electrical system with an exemplary embodiment of a connecting device 3 designed as a compensator for connecting a first housing part 5 and a second housing part 7 of the housing 1. The housing 1 is only shown in the region of the connecting device 3, since the further design of the housing 1 is irrelevant for the invention. For example, the electrical system is a gas-insulated switchgear and the housing 1 is a gas-tight encapsulated housing.

[0033] The connecting device 3 comprises four connecting parts 9, 10, 11, 12, a bellows arrangement 13 with three bellows 15, 16, 17, four first tie rods 19, and four second tie rods 21. The connecting parts 9 to 12 are each made, for example, from a pressure vessel steel. The bellows 15, 16, 17 are each made, for example, from a stainless steel. The tie rods 19, 21 are each made, for example, from a structural steel.

[0034] A first connecting part 9 is firmly connected to a second connecting part 10 via the first tie rods 19. Each first tie rod 19 is welded, for example, to the first connecting part 9 and to the second connecting part 10. The first tie rods 19 run parallel to one another between the first connecting part 9 and the second connecting part 10.

[0035] A third connecting part 11 is firmly connected to a fourth connecting part 12 via the second tie rods 21. Each second tie rod 21 is welded, for example, to the third connecting part 11 and to the fourth connecting part 12. The second tie rods 21 run parallel to each other between the third connecting part 11 and the fourth connecting part 12.

[0036] The third connecting part 11 is arranged between the first connecting part 9 and the second connecting part 10. The second connecting part 10 is arranged between the third connecting part 11 and the fourth connecting part 12.

[0037] A first bellows 15 is arranged between the first connecting part 9 and the third connecting part 11 and is connected to the first connecting part 9 and the third connecting part 11 in a gas-tight manner.

[0038] A second bellows 16 is arranged between the third connecting part 11 and the second connecting part 10 and is connected to the third connecting part 11 and the second connecting part 10 in a gas-tight manner.

[0039] A third bellows 17 is arranged between the second connecting part 10 and the fourth connecting part 12 and is connected in a gas-tight manner to the third connecting part 10 and the fourth connecting part 12.

[0040] The first connecting part 9 is connected to the first housing part 5. For this purpose, the first connecting part 9 has a plurality of connecting regions 23, in each of which the first connecting part 9 is force-fittingly connected to the first housing part 5 by a screw connection 25. Each connecting region 23 has a connecting recess 27 which has an internal thread for a screw 29. The first housing part 5 has a housing flange 31 facing the first connecting part 9, which has housing flange openings 33 corresponding to the connecting recesses 27. A screw 29 is guided through each housing flange opening 33 into a connecting recess 27 and screwed into the internal thread of the connecting recess 27.

[0041] The fourth connecting part 12 is connected to the second housing part 7 in a force-fitting and / or material-fitting manner. For example, the fourth connecting part 12 is connected to the second housing part 7 in a force-fitting manner via further screw connections in a similar manner to how the first connecting part 9 is connected to the first housing part 5. Alternatively or additionally, the fourth connecting part 12 is connected to the second housing part 7 in a material-fitting manner, for example, via at least one welded connection.

[0042] In order to connect the volumes enclosed by the housing parts 5, 7 and the bellows 15, 16, 17 to one another, each connecting part 9 to 12 has a through-hole 35. The through-hole 35 of the first connecting part 9 connects a volume enclosed by the first bellows 15 with a volume enclosed by the first housing part 5. The through-hole 35 of the third connecting part 11 connects the volume enclosed by the first bellows 15 with a volume enclosed by the second bellows 16. The through-hole 35 of the second connecting part 10 connects the volume enclosed by the second bellows 16 with a volume enclosed by the third bellows 17. The through-hole 35 of the fourth connecting part 12 connects the volume enclosed by the third bellows 17 with a volume enclosed by the second housing part 7.The through-hole 35 of each connecting part 9 to 12 is formed centrally in the connecting part 9 to 12, so that each connecting part 9 to 12 is formed annularly around its through-hole 35. In Figure 1, only the through-hole 35 of the first connecting part 9 is shown.

[0043] The second bellows 16 has a larger inner diameter d2 than the first bellows 15 and the third bellows 17. For example, the square of the inner diameter d2 of the second bellows 16 is at least approximately equal to the sum of the squares of an inner diameter d1 of the first bellows 15 and an inner diameter d3 of the third bellows 17. As a result, the volume enclosed as a whole by the bellows 15, 16, 17 remains essentially constant during a relative movement of the two housing parts 5, 7, so that the pressure of a gas in the volume enclosed as a whole by the bellows 15, 16, 17 also remains essentially constant during a relative movement of the two housing parts 5, 7.

[0044] Each bellows 15, 16, 17 is, for example, welded to the two connecting parts 9 to 12 connected to it. Figure 1 shows, by way of example, a weld seam 37 of a weld between the first bellows 15 and the first connecting part 9. The weld seam 37 runs along an edge of the through-hole 35 of the first connecting part 9.

[0045] Figure 2 (FIG. 2) shows a front view of the connecting device 3 shown in Figure 1. Each first tie rod 19 is connected to the first connecting part 9 in a tie rod coupling region 39. The tie rod coupling regions 39 are evenly distributed over an annular edge region of the first connecting part 9 facing away from the through-hole 35 of the first connecting part 9. In this exemplary embodiment, the first connecting part 9 has twelve connecting regions 23, in each of which it is connected to the first housing part 5 by a screw connection 25 by means of a screw 29. The connecting regions 23 are evenly distributed over an annular edge region of the first connecting part 9 facing the through-hole 35 of the first connecting part 9.Between each tie rod coupling region 39 and the connecting region 23 closest to it, the first connecting part 9 has a force distribution recess 41 which is designed in the shape of an elongated hole with longitudinal sides which run substantially perpendicular to a connecting line between the tie rod coupling region 39 and the connecting region 23 closest to it.

[0046] Through each force distribution recess 41, forces acting on the first connecting part 9 are distributed more evenly in the first connecting part 9 than without the force distribution recess 41. Figure 2 shows, by way of example, force directions F1 to F4 of forces acting in the first connecting part 9 via the uppermost first tie rod 19 in Figure 1. Without the force distribution recess 41 arranged below this first tie rod 19, a force exerted on the first connecting part 9 via this first tie rod 19 would primarily act on the connecting region 23 closest to this first tie rod 19, directly below this first tie rod 19.However, due to the force distribution recess 41, this force is distributed more evenly between forces acting on this connection area 23 and represented by the force directions F1, F2, and forces acting on the connection areas 23 adjacent to this connection area 23 and represented by force directions F3, F4.

[0047] In order to make the relationship between Figures 1 and 2 more understandable, the same coordinate system with Cartesian coordinates X, Y, Z was drawn in the figures.

[0048] Although the invention has been illustrated and described in detail by means of preferred embodiments, the invention is not limited by the disclosed examples and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims

Patent claims 1. Connecting device (3) for connecting a first housing part (5) and a second housing part (7) of a housing (1) of an electrical system, the connecting device (3) comprising - a first connecting part (9) with at least one connecting area (23) in which the first connecting part (9) can be connected to the first housing part (5) in a force-locking and / or material-locking manner, and - a second connecting part (10) which is connected to the first connecting part (9) by at least one first tie rod (19) and can be connected directly or indirectly to the second housing part (7), wherein - the first connecting part (9) has at least one force distribution recess (41) through which forces acting on the first connecting part (9) via the at least one first tie rod (19) are distributed more evenly in the first connecting part (9) than without the force distribution recess (41).

2. Connecting device (3) according to claim 1, wherein at least one force distribution recess (41) is arranged between a connecting region (23) and a tie rod coupling region (39) in which the first connecting part (9) is connected to a first tie rod (19).

3. Connecting device (3) according to claim 1 or 2, wherein at least one connecting region (23) has a connecting recess (27) for a screw (29) by means of which the first connecting part (9) can be connected in a force-fitting manner to the first housing part (5).

4. Connecting device (3) according to one of the preceding claims with a bellows arrangement (13) by means of which the two housing parts (5, 7) can be connected in a gas-tight manner.

5. Connecting device (3) according to claim 4 with a third connecting part (11) and a fourth connecting part (12) connectable to the second housing part (7), wherein - the third connecting part (11) is arranged between the first connecting part (9) and the second connecting part (10) and the second connecting part (10) is arranged between the third connecting part (11) and the fourth connecting part (12), and wherein - the bellows arrangement (13) comprises a first bellows (15), a second bellows (16) and a third bellows (17), wherein - the first bellows (15) is arranged between the first connecting part (9) and the third connecting part (11) and is connected in a gas-tight manner to the first connecting part (9) and the third connecting part (11), - the second bellows (16) is arranged between the third connecting part (11) and the second connecting part (10) and is connected in a gas-tight manner to the third connecting part (11) and the second connecting part (10), and - the third bellows (17) is arranged between the second connecting part (10) and the fourth connecting part (12) and is connected in a gas-tight manner to the second connecting part (10) and the fourth connecting part (12).

6. Connecting device (3) according to claim 5, wherein the second bellows (16) has a larger inner diameter than the first bellows (15) and the third bellows (17).

7. Connecting device (3) according to claim 5 or 6, wherein the third connecting part (11) and the fourth connecting part (12) are rigidly connected, in particular by at least one second tie rod (21).

8. Connecting device (3) according to one of claims 5 to 7, wherein the third connecting part (11) has at least one Through-recess (35) which connects a volume enclosed by the first bellows (15) with a volume enclosed by the second bellows (16).

9. Connecting device (3) according to one of claims 5 to 8, wherein the second connecting part (10) has at least one through-hole (35) which connects a volume enclosed by the second bellows (16) with a volume enclosed by the third bellows (17).

10. Connecting device (3) according to one of claims 5 to 9, wherein the first connecting part (9) has at least one through-hole (35) through which a volume enclosed by the first bellows (15) can be connected to a volume enclosed by the first housing part (5).

11. Connecting device (3) according to one of claims 5 to 10, wherein the fourth connecting part (12) has at least one through-hole (35) through which a volume enclosed by the third bellows (17) can be connected to a volume enclosed by the second housing part (7).

12. Housing (1) of an electrical system with a first housing part (5), a second housing part (7) and a connecting device (3) connecting the first housing part (5) and the second housing part (7), which is designed according to one of the preceding claims.

13. Housing (1) according to claim 12, wherein the electrical system is a gas-insulated switchgear.

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