Structural unit for an electrical switching device and electrical switching device

Abstract

The application relates to a structural unit for an electric switching device and to an electric switching device, the structural unit comprising a ceramic component (1) having a first mounting hole in which a pyrotechnic activation device is received, the pyrotechnic activation device comprising a squib assembly (2) which is configured to generate an explosion force upon activation for driving a movable contact (8) of the electric switching device and thereby changing a switching state of the electric switching device. The pyrotechnic activation device comprises a squib metal shell (3) in which the squib assembly is held, the squib metal shell having a metal shell segment which protrudes from the ceramic component, the structural unit further comprising a transition metal connector (4) which is connected to the ceramic component on the one hand by brazing and to the metal shell segment of the squib metal shell on the other hand. A robust electric switching device with emergency safety function of compact size is achieved here.

Description

Technical Field

[0001] This application relates to an electrical switching device, particularly a contactor such as a DC contactor, relay, or circuit breaker. This application also relates to a structural unit for an electrical switching device. Background Technology

[0002] In practice, various electrical switching devices are known, such as contactors, relays, or circuit breakers. These devices play a crucial role in managing and distributing power across various systems by allowing controlled connection and disconnection of high-current circuits. Such devices can be applied in electric vehicles, contributing to efficient power management and safety. For example, in an electric vehicle, one or more high-voltage battery packs can supply power to the drive motor via a main contactor connected to the vehicle's power distribution network. As an electrical switching device, this main contactor can open or close high-current paths, thereby regulating the power flow from the high-voltage battery packs to the drive motor and / or other vehicle components. Utility Model Content

[0003] The objective of this invention is to provide a structural unit for an electrical switching device and an electrical switching device that has a compact structure and improves the safety of circuits associated with the electrical switching device.

[0004] The objective is achieved by a structural unit for an electrical switching device, the structural unit comprising a ceramic component having a first mounting hole in which a pyrotechnic ignition device is received, the pyrotechnic ignition device comprising an ignition tube assembly configured to generate an explosive force upon activation to drive a moving contact of the electrical switching device and thereby change the switching state of the electrical switching device, characterized in that the pyrotechnic ignition device comprises an ignition tube metal shell, the ignition tube assembly being held within the ignition tube metal shell, the ignition tube metal shell having a metal shell section extending from the ceramic component, the structural unit further comprising a transition metal connector connected, on one hand, to the ceramic component by brazing, and on the other hand, to the metal shell section of the ignition tube metal shell.

[0005] For example, with the solution of this application, once an abnormal current occurs in the circuit related to the electric switching device, the ignition tube assembly can be triggered, and the resulting explosive force can separate the moving contact and the stationary contact in a very short time, thus achieving improved safety. In other words, the electric switching device has an emergency safety function. Furthermore, with such a structural unit, the electric switching device can be designed compactly, requiring only a small installation space.

[0006] In some embodiments, the electrical switching device may be a contactor, such as a DC contactor. Alternatively, the electrical switching device may also be a relay or a circuit breaker.

[0007] In some embodiments, the transition metal connector may be a transition metal tube that surrounds the metal shell segment of the ignition tube metal shell, and the transition metal tube and the ceramic component are brazed together in a sealing manner around the end opening of the first mounting hole.

[0008] In some embodiments, the transition metal connector may include a pair of metal plates facing each other about the ignition tube housing, each metal plate having a certain extension angle in the circumferential direction of the ignition tube housing, for example, an extension angle of approximately 90°.

[0009] In some embodiments, the transition metal connector may include three metal plates that are distributed in the circumferential direction of the ignition tube metal shell, for example at an angular spacing of 120°, and each metal plate may have a certain extension angle in the circumferential direction of the ignition tube metal shell, for example, an extension angle of approximately 90°.

[0010] In some embodiments, the ignition tube metal shell is welded to the transition metal tube on the metal shell section, for example by laser welding, and particularly by circumferential sealing welding.

[0011] In some embodiments, the axial outer end of the ignition tube metal shell and the axial outer end of the transition metal tube are flush.

[0012] In some embodiments, the ignition tube housing and the transition metal tube are laser-welded by top welding or side welding.

[0013] In some embodiments, the ignition tube metal shell has a first flange at its axial outer end, and the transition metal tube has a second flange at its axial outer end, with the first flange and the second flange abutting against each other.

[0014] In some embodiments, the first flange and the second flange are welded together, for example by laser welding, particularly by circumferential sealing welding.

[0015] In some embodiments, the ignition tube assembly may be held within the ignition tube housing in at least one of the following ways:

[0016] - The ignition tube assembly and the ignition tube metal shell are welded, for example, by laser welding, and in particular by circumferential sealing welding.

[0017] The ignition tube housing has at least one, particularly at least two, circumferentially distributed grooves, for example, three to six grooves, which form axial stops for the ignition tube assembly. For example, the ignition tube housing may have three grooves distributed at 120° angular intervals.

[0018] The ignition tube housing has a reduced diameter section that forms an axial stop for the ignition tube assembly. For example, the reduced diameter section can be achieved by riveting. Alternatively, the reduced diameter section can also be achieved using other extrusion tools.

[0019] In some embodiments, the ignition tube assembly is recessed within the ignition tube housing. This allows for a lower height position of the pin ends of the ignition tube assembly.

[0020] In some embodiments, a piston is provided in the ignition tube housing between the ignition tube assembly and the axial inner end of the ignition tube housing, the ignition tube assembly being configured to generate an explosive force upon activation to drive the moving contact of the electrical switching device via the piston.

[0021] In some embodiments, no piston is provided in the ignition tube housing, and the ignition tube assembly is configured to generate an explosive force upon activation, the explosive force acting directly on the moving contact of the electrical switching device.

[0022] In some embodiments, the axial inner end of the ignition tube housing is open.

[0023] In some embodiments, the axial inner end of the ignition tube metal shell is sealed by a closure.

[0024] In some embodiments, the closure has a weak point configured such that the closure can be destroyed when the ignition tube assembly is activated.

[0025] In some embodiments, the closure is a single, integral component of the ignition tube's metal casing. In this case, the weak point may be, for example, a slotted groove, a cross-shaped groove, a star-shaped groove, or other forms of rated break line.

[0026] In some embodiments, the closure is a sealing film or metal foil that can be destroyed when the ignition tube assembly is activated.

[0027] In some embodiments, the electrical switching device includes two stationary contacts mounted in a second mounting hole in the ceramic component, and the moving contact is movable between a first terminal position in contact with the two stationary contacts and a second terminal position out of contact with the two stationary contacts.

[0028] In some embodiments, the materials of the ignition tube metal shell and the connecting metal parts can be any of the following: 316 stainless steel, Kova alloy, cold-rolled low-carbon steel plate, and Q195 steel.

[0029] In some embodiments, the materials of the ignition tube metal shell and the connecting metal parts may be the same or different from each other.

[0030] In some embodiments, the brazing can be hard brazing or soft brazing.

[0031] In some embodiments, the solder used for brazing can be a silver-nickel alloy (AgNi).

[0032] The task is also solved by an electrical switching device having a stationary contact and a moving contact that work together, characterized in that the electrical switching device further has a structural unit for an electrical switching device according to any embodiment of this application.

[0033] In some embodiments, the electrical switching device is a contactor (e.g., a DC contactor), a relay, or a circuit breaker.

[0034] In some embodiments, the electrical switching device is an electrical switching device for electric vehicles.

[0035] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0036] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention to further explain its characteristics, features, advantages, and implementation methods. It is self-evident that the present invention is not limited to the specific embodiments.

[0037] Figure 1 This is a perspective view of an electrical switching device according to the first embodiment of this application.

[0038] Figure 2 Is according to Figure 1 A partially cut-away front view of the electrical switchgear.

[0039] Figure 3 Is according to Figure 1 A perspective view of a structural unit of an electrical switching device.

[0040] Figure 4 Is according to Figure 3 A top view of the structural unit.

[0041] Figure 5 Is according to Figure 1 A perspective view of the pyrotechnic ignition device of the electric switch.

[0042] Figure 6A Is according to Figure 4 The sectional view of section line AA in the figure.

[0043] Figure 6B It is a variation of the first embodiment and Figure 6A The corresponding sectional view.

[0044] Figure 7 This is a perspective view of a structural unit of an electrical switching device according to the second embodiment of this application.

[0045] Figure 8 Is according to Figure 7 A top view of the structural unit.

[0046] Figure 9 This is a perspective view of the pyrotechnic ignition device of the electric switch device according to the second embodiment.

[0047] Figure 10A Is according to Figure 8 The sectional view of section line BB in the diagram.

[0048] Figure 10B It is a variant of the second embodiment and Figure 10A The corresponding sectional view.

[0049] Figure 11 This is a perspective view of a structural unit of an electrical switching device according to the third embodiment of this application.

[0050] Figure 12 Is according to Figure 11 A top view of the structural unit.

[0051] Figure 13 This is a perspective view of the pyrotechnic ignition device of the electric switch device according to the third embodiment.

[0052] Figure 14A Is according to Figure 12 The sectional view of section line CC in the figure.

[0053] Figure 14B It is a variant of the third implementation scheme. Figure 14A The corresponding sectional view.

[0054] Figure 15This is a perspective view of a structural unit of an electrical switching device according to the fourth embodiment of this application.

[0055] Figure 16 Is according to Figure 15 A top view of the structural unit.

[0056] Figure 17 This is a perspective view of the pyrotechnic ignition device of the electric switch device according to the fourth embodiment.

[0057] Figure 18A Is according to Figure 16 The sectional view of section line DD in the diagram.

[0058] Figure 18B It is a variant of the fourth embodiment. Figure 18A The corresponding sectional view. Detailed Implementation

[0059] Several exemplary embodiments will now be described more fully with reference to the accompanying drawings. It should be understood that elements not essential for understanding the invention may be omitted from the drawings for ease of illustration and understanding. In the drawings, the same reference numerals may denote the same parts or parts that function identically. Numerous specific details, such as examples of specific parts, devices, and methods, are set forth in the following description to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that not all of these specific details are necessarily required. The exemplary embodiments should not be construed as limiting.

[0060] First refer to Figures 1 to 5 and Figure 6A The present application describes an electrical switch device 100 according to a first embodiment. The electrical switch device 100 has two stationary contacts 5 and one moving contact 8. The moving contact 8 is connected to a push rod 9 via a spring element 10 (especially a coil spring), which preloads the moving contact 8 into a stationary position where it contacts and conducts with the two stationary contacts 5. In other words, the electrical switch device 100 is normally closed. Alternatively, the electrical switch device 100 can be configured as normally open, wherein the moving contact is separated from its associated stationary contact in the stationary position. The electrical switch device 100 may have an electromagnetic coil 11 housed in a housing component 12. The push rod 9 can be configured as an armature, which, when energized, attracts the push rod 9, thereby manipulating the moving contact 8 to change the switching state of the electrical switch device 100 during normal operation.

[0061] The electrical switching device 100 may include a structural unit 20 comprising a ceramic component 1, which can be fixed to the aforementioned housing component 12. The ceramic component 1 may have a central first mounting hole and two second mounting holes adjacent to the first mounting hole. The two second mounting holes may be opposite each other about the first mounting hole. A pyrotechnic ignition device is received in the first mounting hole. Two stationary contacts 5 are mounted in the second mounting holes. The pyrotechnic ignition device includes an ignition tube assembly 2 configured to generate an explosive force upon activation to drive the moving contact 8 of the electrical switching device 100 and thereby change the switching state of the electrical switching device 100. The ignition tube metal housing 3 may be sealed with a closure 16 at its axially inner end adjacent to the piston 6, the closure 16 being destructible upon activation of the ignition tube assembly 2. For example, the closure 16 may have a pre-formed rated break line. When the ignition tube assembly 2 is activated, the explosive force generated by the ignition tube assembly 2 causes the seal 16 to rupture, and can separate the moving contact 8 from the two stationary contacts 5 in a very short time to cut off the relevant circuit, ensuring electrical safety in abnormal situations. The seal 16 can be a single, integral component of the ignition tube metal shell 3 made of the same material. In this case, the weak point can be, for example, a slotted groove, a cross-shaped groove, a star-shaped groove, or other forms of rated break line. Alternatively, the seal 16 can also be a separate sealing film or metal foil. As an alternative, the seal 16 can be omitted, leaving the axial inner end of the ignition tube metal shell 3 open.

[0062] The ignition tube housing 3 has a metal shell section extending from the ceramic component 1. The ignition tube assembly 2 is held within the ignition tube housing 3 and extends outward from the ignition tube housing 3 with two pins 7. These two pins 7 can be connected to a controller, such as a controller in an electric vehicle, to activate the ignition tube assembly 2 to generate an explosive force when needed, particularly in abnormal conditions such as a short circuit, via a control signal from the controller. The electrical switching device 100 also includes a transition metal connector 4, which is connected to the ceramic component 1 by brazing on one hand and to the metal shell section of the ignition tube housing 3 extending from the ceramic component 1 on the other hand. In the present embodiment, the transition metal connector 4 is a transition metal tube that surrounds the metal shell section of the ignition tube housing 3, and the transition metal tube and the ceramic component 1 are brazed together in a sealing manner around the end opening of the first mounting hole. The solder used for brazing can be, for example, a silver-nickel alloy (AgNi) or any other suitable solder. The solder itself is not important, as is known to those skilled in the art.

[0063] In a first embodiment, the ignition tube housing 3 has a first flange 13 at its axially outer end, and the transition metal tube has a second flange 14 at its axially outer end, with the first flange 13 and the second flange 14 abutting against each other. Advantageously, the first flange 13 and the second flange 14 can be laser-welded circumferentially for a sealing effect. As a supplement or replacement to welding on the first flange 13 and the second flange 14, the ignition tube housing 3 and the transition metal tube can also be side-welded circumferentially, for example, by laser welding, preferably circumferentially for a sealing effect. The transition metal tube may have: a first axial section abutting against the ignition tube housing adjacent to the second flange 14; a second axial section adjacent to the ceramic component 1, having a larger diameter than the first axial section; and a transition section between the first axial section and the second axial section. In the second axial section, there is a circumferential gap between the transition metal tube and the ignition tube housing 3.

[0064] In the first embodiment, the ignition tube assembly 2 is generally aligned with the axial outer end of the ignition tube housing 3. Alternatively, the ignition tube assembly 2 may be recessed into the ignition tube housing 3 at a predetermined depth to achieve a lower height position at the ends of the two pins 7.

[0065] Figure 6B It is a variation of the first embodiment and Figure 6A The corresponding cross-sectional view. The main difference here is that a piston 6 is provided within the ignition tube housing 3. The piston 6 can be sealed relative to the inner wall of the ignition tube housing 3 by a sealing ring. The piston 6 has a sharp point on its front side, or on its side facing the closure 16, which can facilitate the rupture of the closure 16 when the ignition tube assembly 2 is activated. The piston 6 then drives the moving contact 8, causing the moving contact 8 to separate from the two stationary contacts 5. In other respects, this variant can be configured in the same or similar manner as the first embodiment. Similarly, as an alternative, the closure 16 can be omitted, leaving the axial inner end of the ignition tube housing 3 open.

[0066] In other embodiments shown in the other figures, the electrical switching device 100 may similarly have an electromagnetic coil 11 and a housing component 12 that houses the electromagnetic coil 11. In these embodiments, the structural unit 20 of the electrical switching device 100 is also configured similarly to the structural unit 20 of the electrical switching device 100 in the first embodiment. The differences will be mainly described below, while other aspects can be referred to the description for the first embodiment.

[0067] exist Figures 7 to 9 and Figure 10AIn the second embodiment shown, structural unit 20 also includes ceramic component 1 and two stationary contacts 5, which can be configured and arranged in the same or similar manner as in the first embodiment. Currently, the ignition tube housing 3 and the transition tube do not have flanges at their axially outer ends, and are aligned at their axially outer ends. The ignition tube housing 3 and the transition tube can be welded by top welding or side welding, such as laser welding, particularly circumferential sealing welding. Furthermore, the ignition tube assembly 2 is recessed into the ignition tube housing 3 to achieve a lowered height position at the ends of the two pins 7. Alternatively, it is also possible (not only for the current second embodiment, but also for the third and fourth embodiments described below) that the ignition tube assembly 2 is generally aligned with the axially outer end of the ignition tube housing 3, as in the first embodiment. Additionally, in the second embodiment, the axially inner end 16a of the ignition tube housing 3 is open. Alternatively, as in the first embodiment, the axially inner end 16a of the ignition tube housing 3 can also be provided with a closure 16.

[0068] Figure 10B It is a variant of the second embodiment and Figure 10A The corresponding cross-sectional view. The main difference here is that a piston 6 is provided within the ignition tube housing 3. The piston 6 can be sealed relative to the inner wall of the ignition tube housing 3 by a sealing ring. The piston 6 has a sharp point on its front side, or on its side facing the closure 16, which can facilitate the rupture of the closure 16 when the ignition tube assembly 2 is activated. The piston 6 then drives the moving contact 8, causing the moving contact 8 to separate from the two stationary contacts 5. In other respects, this variant can be configured in the same or similar manner as the second embodiment.

[0069] exist Figures 11 to 13In the third embodiment shown in 14A, similar to the second embodiment, the ignition tube housing 3 and the transition tube have no flanges at their axially outer ends. The ignition tube housing 3 and the transition tube are aligned at their axially outer ends, and the ignition tube assembly 2 is also recessed into the ignition tube housing 3 at a predetermined depth to achieve a lowered height position at the ends of the two pins 7. Here, the ignition tube housing 3 may have at least one, for example, 3 to 6 radially inwardly extending grooves 15. In one embodiment, three grooves 15 are applied to the ignition tube housing 3 at the same axial position, evenly distributed in the circumferential direction with an angular spacing of 120°. These grooves 15 form axial stops for the ignition tube assembly 2. These grooves 15 can be designed so that even when the ignition tube assembly 2 is activated, they can resist explosive forces to firmly hold the ignition tube assembly 2 in the ignition tube housing 3. As a supplement to the pressure groove 15, the ignition tube metal shell 3 and the transition metal tube can be additionally welded by top welding or side welding, such as laser welding, and particularly by circumferential sealing welding. In the third embodiment, the axial inner end of the ignition tube metal shell 3 is provided with a closure 16. Alternatively, as in the second embodiment, the axial inner end of the ignition tube metal shell 3 can also be open.

[0070] Figure 14B It is a variant of the third implementation scheme. Figure 14A The corresponding cross-sectional view. The main difference here is that a piston 6 is provided within the ignition tube housing 3. The piston 6 can be sealed relative to the inner wall of the ignition tube housing 3 by a sealing ring. The piston 6 has a sharp portion on its front side, or on its side facing the closure 16, which can facilitate the rupture of the closure 16 when the ignition tube assembly 2 is activated. The piston 6 then drives the moving contact 8, causing the moving contact 8 to separate from the two stationary contacts 5. In other respects, this variant can be configured in the same or similar manner as the third embodiment.

[0071] exist Figures 15 to 17 and Figure 18AIn the fourth embodiment shown, similar to the second embodiment, the ignition tube housing 3 and the transition tube have no flanges at their axially outer ends. The ignition tube housing 3 and the transition tube are aligned at their axially outer ends, and the ignition tube assembly 2 is recessed into the ignition tube housing 3 at a predetermined depth to achieve a lowered height position at the ends of the two pins 7. Here, the ignition tube housing 3 may have an intermediate section 31 in which the ignition tube assembly 2 is received. The ignition tube housing 3 has a reduced diameter section 33 adjacent to the axially outer end of the ignition tube assembly 2, the reduced diameter section 33 forming an axial stop for the ignition tube assembly 2. The reduced diameter section 33 can be achieved by riveting, wherein, before the riveting process, the unreduced reduced diameter section 33 may have the same diameter as the intermediate section 31, allowing the ignition tube assembly 2 to be easily installed into the ignition tube housing 3 through its axially outer ends. The ignition tube housing 3 also has an additional reducing section 32 adjacent to the axial inner end of the ignition tube assembly 2, forming another axial stop for the ignition tube assembly. The reducing section 32 may already exist before the riveting process. In other words, the tube blank used as the ignition tube housing 3 before the riveting process has two tube sections, one of which provides the reducing section 32, the other of which provides an intermediate section 31 in a first portion adjacent to the reducing section 32, and the other of which provides a reducing section 33 in a second portion opposite to the reducing section 32 after the riveting process. The reducing section 33 can be designed so that even when the ignition tube assembly 2 is activated, the reducing section 33 can resist the explosive force to firmly hold the ignition tube assembly 2 in the ignition tube housing 3. The precise axial mounting position of the ignition tube assembly 2 in the ignition tube housing 3 can be ensured by the reducing section 32 or any other suitable positioning structure. In the fourth embodiment, the axial inner end of the ignition tube metal housing 3 is provided with a closure 16. Alternatively, as in the second embodiment, the axial inner end of the ignition tube metal housing 3 may also be open.

[0072] Figure 18B It is a variant of the fourth embodiment. Figure 18A The corresponding cross-sectional view. The main difference here is that a piston 6 is provided within the ignition tube housing 3. The piston 6 can be sealed relative to the inner wall of the ignition tube housing 3 by a sealing ring. The piston 6 has a sharp point on its front side, or on its side facing the closure 16, which can facilitate the rupture of the closure 16 when the ignition tube assembly 2 is activated. The piston 6 then drives the moving contact 8, causing the moving contact 8 to separate from the two stationary contacts 5. In other respects, this second variant can be configured in the same or similar manner as the fourth embodiment.

[0073] In various embodiments of this application, the materials of the ignition tube metal shell 3 and the connecting metal part 4, particularly the transition metal tube, can be any known suitable materials, especially materials suitable for welding, such as laser welding. Preferred materials include any of the following: 316 stainless steel, Kova alloy, cold-rolled low-carbon steel sheet, and Q195 steel.

[0074] In any embodiment of this application, it is particularly advantageous that the transition metal tube and the ceramic component are brazed together in a sealing manner around the end opening of the first mounting hole, and the transition metal tube is also welded together in a sealing manner around the ignition tube housing, and the ignition tube housing and the ignition tube assembly are also connected together in a sealing manner around the ignition tube, such that the first mounting hole constitutes an axially outward sealed cavity. Therefore, such a structural unit not only ensures reliable connection strength but also ensures reliable sealing. In particular, when the ignition tube housing and the ignition tube assembly are welded and / or connected by groove pressing or riveting, the connection strength of the ignition tube assembly can be guaranteed particularly effectively.

[0075] The electrical switch device 100 in the various embodiments of this application can be used in electric vehicles. It goes without saying that such an electrical switch device can also be used in other electrical installations, particularly industrial equipment, such as wind power generation equipment, charging stations, and stationary energy storage stations.

[0076] It should be noted that the terminology used herein is for illustrative purposes only and is not intended to limit the disclosure. The singular forms “a” and “the one” as used herein should include the plural forms unless the context explicitly states otherwise. It is understood that the terms “comprising” and “including,” and other similar terms, when used in the application documents, specifically describe the presence of the stated operation, element, and / or component, without excluding the presence or addition of one or more other operations, elements, components, and / or combinations thereof. The term “and / or” as used herein includes all arbitrary combinations of one or more of the associated listed items. In the description of the drawings, similar reference numerals always denote similar elements.

[0077] The thickness of the elements in the accompanying drawings may be exaggerated for clarity. It is also understood that if an element is described as being on, coupled to, or connected to another element, then the element may be directly formed on, coupled to, or connected to the other element, or there may be one or more intermediate elements between them. Conversely, if the expressions "directly on," "directly coupled to," and "directly connected to" are used herein, it indicates that there is no intermediate element. Other terms used to describe relationships between elements should be interpreted similarly, such as "between" and "directly between," "attached" and "directly attached," "adjacent" and "directly adjacent," etc.

[0078] Terms such as “top,” “bottom,” “above,” “below,” “over,” “under,” etc., are used to describe the relationship of one element, layer, or region relative to another element, layer, or region, as shown in the accompanying drawings. It is understood that these terms should also encompass other orientations of the device in addition to those described in the accompanying drawings.

[0079] It is understood that although the terms "first," "second," etc., may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. Therefore, a first element may be referred to as a second element without departing from the teachings of this inventive concept.

[0080] It can also be considered that all the exemplary embodiments disclosed herein can be arbitrarily combined with each other. Finally, it should be noted that the above embodiments are only used to understand the present invention and do not constitute a limitation on the protection scope of the present invention. For those skilled in the art, modifications can be made based on the above embodiments, and these modifications do not depart from the protection scope of the present invention.

Claims

1. A structural unit for an electric switching device, the structural unit (20) comprising a ceramic component (1) having a first mounting hole in which a pyrotechnic ignition device is received, the pyrotechnic ignition device comprising an ignition tube assembly (2) configured to generate an explosive force upon activation to drive a moving contact (8) of the electric switching device and thereby change the switching state of the electric switching device, characterized in that, The pyrotechnic ignition device includes an ignition tube metal shell (3), the ignition tube assembly is held in the ignition tube metal shell, the ignition tube metal shell has a metal shell section extending from the ceramic component, and the structural unit also includes a transition metal connector (4), which is connected to the ceramic component by brazing on one hand and to the metal shell section of the ignition tube metal shell on the other hand.

2. The structural unit for an electrical switching device according to claim 1, characterized in that, The transition metal connector (4) is a transition metal tube that surrounds the metal shell section of the ignition tube metal shell (3), and the transition metal tube and the ceramic component (1) are brazed together in a sealing manner around the end opening of the first mounting hole.

3. The structural unit of the electrical switching device according to claim 2, characterized in that, The ignition tube metal shell (3) is welded to the transition metal tube in a sealed manner around the metal shell section.

4. The structural unit of the electrical switching device according to claim 2 or 3, characterized in that, The outer axial end of the ignition tube metal shell (3) is flush with the outer axial end of the transition metal tube.

5. The structural unit for an electrical switching device according to claim 2 or 3, characterized in that, The ignition tube metal shell (3) has a first flange (13) at its axial outer end, and the transition metal tube has a second flange (14) at its axial outer end. The first flange and the second flange are close to each other and are welded together in a sealing manner around each other.

6. The structural unit for an electrical switching device according to claim 1 or 2, characterized in that, The ignition tube assembly (2) is held in the ignition tube metal housing (3) by at least one of the following methods: -The ignition tube assembly and the ignition tube metal shell are welded together; - The ignition tube metal housing has at least two grooves (15) distributed in the circumferential direction, the grooves forming axial stops for the ignition tube assembly; - The ignition tube metal shell has a diameter reduction section (33) that forms an axial stop for the ignition tube assembly.

7. The structural unit for an electrical switching device according to claim 1 or 2, characterized in that, The ignition tube assembly (2) is recessed and installed in the ignition tube metal shell (3).

8. The structural unit for an electrical switching device according to claim 1 or 2, characterized in that, In the ignition tube metal housing, a piston (6) is provided between the ignition tube assembly and the axial inner end of the ignition tube metal housing. The ignition tube assembly is configured to generate an explosive force when activated to drive the moving contact (8) of the electric switch device through the piston. or No piston is provided in the metal housing of the ignition tube, and the ignition tube assembly is configured to generate an explosive force upon activation, which can act directly on the moving contact of the electrical switching device.

9. The structural unit for an electrical switching device according to claim 1 or 2, characterized in that, The electrical switch device includes two stationary contacts (5) installed in the second mounting hole of the ceramic component, and the moving contact (8) is movable between a first terminal position that is in contact with the two stationary contacts and a second terminal position that is out of contact with the two stationary contacts.

10. The structural unit for an electrical switching device according to claim 1 or 2, characterized in that, The axial inner end of the ignition tube metal shell is open; or the axial inner end of the ignition tube metal shell is closed by a closure member, the closure member having a weak point, the weak point being configured such that the closure member can be destroyed when the ignition tube assembly is activated.

11. An electrical switching device (100) having a stationary contact (5) and a moving contact (8) that work together, characterized in that, The electrical switching device further comprises a structural unit for an electrical switching device according to any one of claims 1 to 10.

12. The electrical switching device according to claim 11, characterized in that, The electrical switching device is a contactor, relay, or circuit breaker.

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