CN116417299A - Switching device with pyrotechnic actuator - Google Patents

Abstract

The invention relates to a switching device with a pyrotechnic excitation device, which comprises a switching device body and the pyrotechnic excitation device arranged on the switching device body, wherein the pyrotechnic excitation device is of an independent modularized structure, and the pyrotechnic excitation device serving as an independent module is fixedly arranged on the switching device body from the outside of the switching device body. Because the pyrotechnic excitation device is of a modularized structure, the pyrotechnic excitation device is independent of the relay body and can be produced independently and then fixedly mounted on the relay. The pyrotechnic excitation device is easy to manage and control in production and transportation, has small number of parts, is easy to assemble, and is easier to realize the standardization of parts, thereby achieving the purposes of reducing weight and cost and improving performance.

Description

Switching device with pyrotechnic actuator

Technical Field

The invention relates to the field of switching appliances, in particular to a switching appliance with a pyrotechnic excitation device.

Background

The relay is widely applied to remote control, remote measurement, communication, automatic control, electromechanical integration and power electronic equipment, and is a core component for controlling the state of a switch in an electric loop. With the continuous development and alternation of electrical technology, the main loop load requirement is higher and higher, and meanwhile, the short circuit resistance requirement on the relay is also higher and higher. In recent years, manufacturers propose the main circuit short-circuit resistance of 20KA or even 30KA, and under such high short-circuit current, a great short-circuit electric repulsive force occurs between contacts of the relay, so that the movable reed is forced to be repelled from the fixed contact. In order to resist the short-circuit electric repulsive force to maintain the closed state of the movable reed and the movable contact, the electric repulsive force has to be resisted by increasing the pressure of the contact spring or the closing magnetic attraction force of the movable reed (i.e., the magnetic attraction force of the movable reed driven to move to be closed by the electromagnetic driving mechanism). However, when the pressure of the contact spring or the closing magnetic attraction of the movable reed is increased, the normal breaking action of the movable reed is also influenced, and when the short-circuit current is further increased, if breaking is not timely, the loop safety cannot be ensured. Therefore, in the prior art, the relay is assisted to be rapidly disconnected by arranging the pyrotechnic excitation device (pyrotechnic actuator), when the system monitors that the short-circuit current reaches a critical value, the excitation device is triggered to detonate gunpowder, and the movable contact (movable reed) is pushed to be rapidly disconnected by the impact force of gunpowder explosion, so that the loop protection effect is realized.

The existing pyrotechnic excitation device is usually integrated in the relay and is fixed with the relay, so that more relay parts are caused, the manufacturing and assembling processes are complex, and the cost is increased. And the pyrotechnic excitation device can not be replaced, when the load current changes, the pyrotechnic excitation device can not be replaced independently, but the whole relay is replaced by other specifications, so that the device is inconvenient.

Disclosure of Invention

In view of the above, the present invention therefore proposes a switching device with a pyrotechnic actuator that is structurally optimized.

The invention is realized by adopting the following technical scheme:

the invention provides a switching device with a pyrotechnic excitation device, which comprises a switching device body and the pyrotechnic excitation device arranged on the switching device body, wherein the switching device body comprises a fixed static contact part and a movable dynamic contact part to execute a switching function, the pyrotechnic excitation device is of an independent modularized structure, the pyrotechnic excitation device serving as an independent module is fixedly arranged on the switching device body from the outside of the switching device body, and explosive impact force for pushing the movable contact part to be far away from the static contact part is generated by igniting gunpowder according to the load condition of the switching device body so as to assist the switching device to be rapidly disconnected.

In one embodiment, the switching device body preferably includes an outer housing, the movable contact portion is disposed in the outer housing, and one end of the pyrotechnic excitation device extends into the outer housing to be opposite to one side of the movable contact portion.

Wherein, based on manufacturing and installation considerations, in one embodiment, preferably the pyrotechnic excitation device includes an exciter, a piston and a bottom shell, the exciter and the bottom shell are fixedly connected, the bottom shell is in a hollow structure, the piston is installed in the bottom shell in a matching way, the bottom shell stretches into the inside of the outer shell and faces the movable contact part, when the pyrotechnic excitation device is excited, the exciter ignites gunpowder and pushes the piston to break the bottom shell through fuel gas, and the piston moves towards the movable contact part under the guiding action of the bottom shell so as to push the movable contact part to be far away from the static contact part.

Wherein, in order to collect the impact force of the pyrotechnic activation device when detonating at the lower end of the bottom shell, thereby enhancing the ability of the piston to break the bottom shell, in one embodiment, the bottom shell is preferably a structure that gradually contracts in a direction toward the movable contact portion.

Wherein, in order to break the bottom shell more quickly and push the movable reed to break rapidly, in one embodiment, the piston is a structure which gradually contracts in a direction towards the movable contact part.

In order to improve the arc extinguishing capability of the switching device, in one embodiment, it is preferable that an arc extinguishing medium is further stored in the piston or the bottom shell, and after the piston breaks the bottom shell, the arc extinguishing medium is released to the contact inner cavity through the breaking of the piston or the bottom shell, so as to perform arc extinguishing treatment on the arc between the static contact part and the movable contact part.

Wherein, based on manufacturing and installation considerations, in one embodiment, it is preferable that the exciter comprises a hollow exciter base, a first flanging is provided at one end of the exciter base, a second flanging is provided at one end of the bottom shell, and the first flanging and the second flanging are butted and fixed so as to make the exciter and the bottom shell be fixedly connected.

Wherein, based on manufacturing and installation considerations, in one embodiment, preferably the second turn-ups are welded fixedly with the outer shell, be provided with the annular bead that is used for improving the welding steadiness on the second turn-ups.

Wherein, based on manufacturing and installation considerations, in one embodiment, it is preferred that the actuator further comprises a connector fixedly mounted inside the actuator base, an igniter and a sealing ring, the connector is clamped and fixed on the inner wall of the exciter base, the sealing ring is pressed into the exciter base in an interference mode, one end of the sealing ring compresses the igniter towards the connector, and the other end of the sealing ring compresses the piston towards the bottom shell.

In order to improve electrical performance, in one embodiment, preferably, the switching apparatus body further includes a ceramic cover covering the inside of the outer housing and covering the contact portions of the static contact portion and the moving contact portion with each other, a socket is formed in the ceramic cover, and one end of the pyrotechnic excitation device passes through the socket and is welded and fixed to the ceramic cover and seals the socket.

In order to be able to quickly exchange the pyrotechnic activation device according to the load requirements, it is preferred in one embodiment that the pyrotechnic activation device is detachably fixedly connected to the switching device body.

Wherein in one embodiment, the switching device is preferably a dc high voltage relay.

The invention has the following beneficial effects: in the present invention, the pyrotechnic activation device is a modular structure that can be produced separately from the relay body and then fixedly mounted to the relay. The pyrotechnic excitation device is easy to manage and control in production and transportation, has small number of parts, is easy to assemble, is easier to realize the standardization of parts, and achieves the aims of reducing weight and cost and improving performance.

Drawings

FIG. 1 is a cross-sectional view of the relay with pyrotechnic activation device of example 1 (relay in an open state);

FIG. 2 is a schematic illustration of the pyrotechnic cup of example 1 inserted into and fixedly attached to a ceramic cup;

FIG. 3 is an exploded view of the structure of the pyrotechnic initiator device of example 1;

FIG. 4 is a cross-sectional view of the pyrotechnic activation device of example 1;

FIG. 5 is an exploded view (front view) of the structure of the actuator in example 1;

FIG. 6 is an exploded view (perspective view) of the structure of the actuator in example 1;

fig. 7 is a cross-sectional view of the relay with pyrotechnic activation device in example 1 (relay in on state);

FIG. 8 is a cross-sectional view of the relay with pyrotechnic activation device of example 1 (pyrotechnic activation device activation);

fig. 9 (a) is a schematic view of the bottom chassis in embodiment 2;

fig. 9 (b) is a sectional view of the bottom chassis in embodiment 2;

fig. 10 (a) is a schematic view of the bottom chassis in embodiment 3;

fig. 10 (b) is a sectional view of the bottom chassis of embodiment 3;

FIG. 11 is a schematic view of one possible construction of the piston of example 4;

FIG. 12 is a schematic view of another possible construction of the piston of example 4;

fig. 13 is a schematic diagram of the arc extinguishing medium stored in the piston in example 5.

Detailed Description

For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The invention will now be further described with reference to the drawings and detailed description.

Example 1:

referring to fig. 1 to 2, as a preferred embodiment of the present invention, there is provided a relay having a pyrotechnic activation device, comprising a relay body 100 and a pyrotechnic activation device 5 mounted and attached to the relay body 100, the relay body 100 comprising a stationary contact 1 (as a stationary contact portion) and a movable contact 2 (as a movable contact portion) for effecting the on-off thereof, the relay body 100 further comprising an outer case 3, one end of the stationary contact 1 being exposed to the outer case 3 to be electrically connected to an external load, the other end being extended into the outer case 3, the movable contact 2 being provided inside the outer case 3 and connected to an electromagnetic driving mechanism 4. The static contact 1 is provided with internal threads and can be used for being in threaded connection and fixation with an external wiring terminal. The movable reed 2 is a bridge type movable reed, and under the action of the electromagnetic driving mechanism 4, the movable reed 2 can relatively move close to or far away from the fixed contacts 1, and when the movable reed 2 is simultaneously contacted with the two fixed contacts 1, the communication of a load is realized. For convenience of description, the fixed contact 1 is defined to be relatively above the movable contact spring 2, and the movable contact spring 2 is relatively below the fixed contact 1.

The relay body 100 further comprises a ceramic cover 6, the ceramic cover 6 is fixedly arranged inside the outer shell 3, the lower end of the fixed contact 1 and the movable contact 2 are covered (namely, the contact points of the fixed contact 1 and the movable contact 2 and each other are covered) so as to form a contact inner cavity, the contact points of the fixed contact 1 and the movable contact 2 are isolated from the outside air through the ceramic cover 6 so as to obtain high pressure resistance, and the relay can be effectively ensured to have low contact resistance, long service life and high reliability. And when the relay is short-circuited, the arc resistance and high temperature resistance of the ceramic material can ensure the safety and reliability of a loop under the short-circuited arc.

The outer casing 3 further comprises a base 32 and an upper cover 31 which are connected, the ceramic cover 6 is arranged in the upper cover 31, the pyrotechnic excitation device 5 is fixedly connected to the ceramic cover 6 by inserting from the outside of the ceramic cover 6, the lower end of the pyrotechnic excitation device 5 stretches into a contact inner cavity in the ceramic cover 6 to be right above the movable reed 2, and the upper cover 31 is arranged on the ceramic cover 6 and the pyrotechnic excitation device 5 in a covering mode to complete integral assembly of the relay. Referring to fig. 2, the pyrotechnic initiator 5 is an independent modular structure, which is a cylindrical solid structure, and a jack 61 is formed at the upper end of the ceramic cover 6, and the lower end of the pyrotechnic initiator 5 passes through the jack 61 to extend into the contact cavity. The pyrotechnic initiator 5 may be fixed to the ceramic cap 6 by welding, riveting, screwing, etc., and in this embodiment, the pyrotechnic initiator 5 is fixed to the ceramic cap 6 by brazing. In this embodiment, the top surface of the upper cover 31 has a through hole and a hollow cylindrical section for giving way and matching the two fixed contacts 1 and one pyrotechnic excitation device 5, so that the top ends of the two fixed contacts 1 can be exposed out of the outer shell 3, and the outside of the pyrotechnic excitation device 5 can be coated and protected. In addition, for improving electrical safety, two sides of the outer wall of the hollow cylindrical section also extend respectively to the direction perpendicular to the drawing paper surface to be shown (not shown due to the angle problem). In other embodiments, the pyrotechnic type excitation device 5 may be fixedly connected to the outer housing 3, but in this embodiment, the pyrotechnic type excitation device 5 is fixedly connected to the ceramic cover 6, so that the assembly process can be simplified, and the pyrotechnic type excitation device 5 and the stationary contact 1 are fixedly assembled on the ceramic cover 6 and then the upper cover 31 is covered.

Referring to fig. 3-6, pyrotechnic activation device 5 specifically includes an actuator 51, a piston 52, and a bottom shell 53. The actuator 51 and the bottom case 53 are fixed to each other in a top-to-bottom manner, and the piston 52 is accommodated between the actuator 51 and the bottom case 53. Wherein the actuator 51 further comprises a hollow actuator base 512, and a connector 511, an igniter 513 and a sealing ring 514 fixedly mounted inside the actuator base 512. The exciter base 512 has a tubular structure, a first flange 510 is disposed at the lower end of the exciter base, the bottom shell 53 is also a hollow tubular structure, a second flange 532 is disposed at the upper end of the bottom shell 53, and the first flange 510 and the second flange 532 are butted and fixed (such as welding, riveting, and screwing) so as to realize the joint fixation of the exciter 51 and the bottom shell 53. The lower end of the bottom shell 53 protrudes into the contact cavity of the ceramic cup 6, and the second flange 532 is fixed to the ceramic cup 6 by soldering, so that a fixed connection of the pyrotechnic initiator 5 and the ceramic cup 6 is achieved. As shown in fig. 4, the side of the second flange 532 facing the ceramic cover 6 is provided with an annular rib 531, and the provision of the annular rib 531 can further increase the brazing stability of the second flange 532 to the ceramic cover 6. In addition, since the first flange 510 and the second flange 532 form the expanded diameter portion that expands outward to further seal the insertion hole 61, the sealing property of the ceramic cover 6 can be ensured.

In this embodiment, the initiator base 512 and the bottom shell 53 are combined and fixed to form the outer shell of the pyrotechnic initiator 5. The connector 511, the igniter 513, the seal ring 514, and the piston 52 are disposed inside the outer housing in this order from top to bottom, and the connector 511 is connected to the lead 5131 of the igniter 513. The connector 511 is fastened and fixed on the inner wall of the exciter base 512, the sealing ring 514 is pressed into the exciter base 512 in an interference manner and presses the ignition tool 513 upwards for fixing, the upper end and the lower end of the piston 52 are respectively abutted by the sealing ring 514 and the bottom shell 53, the sealing ring 514 can play a role in moisture prevention and air sealing, and the ignition tool 513 above and the piston 52 below the sealing ring 514 can be further pressed through micro deformation generated by pressing the sealing ring 514, so that vibration loosening is prevented.

Referring to fig. 7-8, the connector 511 is used for fixedly connecting an ignition lead of a monitoring excitation circuit to transmit an excitation electric signal sent by the monitoring excitation circuit to excite the ignition tool 513, wherein the monitoring excitation circuit can be that after a monitoring current value (or a current climbing rate) reaches a certain threshold value, the sent excitation electric signal is conducted downwards through the connector 511, and the ignition tool 513 is excited to perform ignition. An air gap 50 is arranged between the piston 52 and the ignition tool 513, high-pressure fuel gas is generated in the air gap 50 (namely ignition is performed) after the ignition tool 513 ignites gunpowder, the piston 52 is pushed to downwards break through the bottom shell 53, the piston 52 pushes the movable reed 2 to downwards move, the movable reed 2 is helped to be separated from contact with the fixed contact 1, and quick breaking of the relay is realized.

The bottom shell 53 is of a hollow cylindrical structure, and the piston 52 is of a revolving structure with a shaft hole matched with the inside of the bottom shell 53, so that the bottom shell 53 can form a guiding function on the piston 52, and the piston 52 moves downwards along the hollow cylindrical inner cavity of the bottom shell 53 after the ignition tool 513 is ignited.

In this embodiment, the pyrotechnic actuator 5 is a modular structure that can be produced separately from the relay body and then fixedly mounted to the relay. The pyrotechnic excitation device 5 is easy to control in production and transportation, has small number of parts, is easy to assemble, and is easier to realize the standardization of parts, thereby achieving the purposes of reducing weight and cost and improving performance. And the ignition tool 513 extends out of a lead 5131 and is connected with an ignition lead of the monitoring excitation circuit through the connector 511, so that gunpowder in the ignition tool 513 is far away from a lead-out end of the ignition lead, the temperature is raised and the requirement of medicament temperature resistance is reduced.

As a preferred example, the pyrotechnic type excitation device 5 is applied to a ceramic sealing relay, and the pyrotechnic type excitation device 5 is specifically welded with the ceramic cover welding 3, so that the welding tightness is good, the sealing performance and the vibration resistance of the pyrotechnic type excitation device 5 are better, the forming of the outer shell of the pyrotechnic type excitation device 5 is simpler, and the product height is lower. In other embodiments, the pyrotechnic type excitation device 5 may be applied to relays of other structures, so long as a jack (such as the jack 61 of the present embodiment) is provided on the relay body for inserting the pyrotechnic type excitation device 5, and the pyrotechnic type excitation device 5 is attached to the relay by a fixed connection means. The pyrotechnic excitation device 5 can also be fixed with the relay body in a detachable connection (such as a screw connection) manner, so that the pyrotechnic excitation device 5 can be quickly replaced according to input requirements.

As shown in fig. 8, an arc extinguishing medium 54 is further arranged in the bottom shell 53, when the pyrotechnic excitation device 5 is excited, the bottom shell 53 is broken down by the piston 52 to release the arc extinguishing medium 54 in the contact inner cavity of the ceramic cover 6, arc extinguishing treatment is performed on the contact gap between the fixed contact 1 and the movable reed 2, arc extinguishing capability during contact disconnection is further accelerated, and short circuit safety of products is improved. In this embodiment, the quenching medium 54 is quartz sand. Because the gas at the lower end of the pyrotechnic excitation device 5 expands rapidly after ignition and explosion, the arc extinguishing medium 54 stored in the bottom shell 53 or the piston 52 can be rapidly and evenly spread in the contact inner cavity together with the explosion gas, and the arc extinguishing effect can be directly exerted in a short time without being limited by the shapes of the fixed contact 1 and the movable reed 2 and the inner contour of the contact inner cavity to the greatest extent. In this embodiment, the fixed contacts 1 are disposed at two ends of the bridge movable reed, and the pyrotechnic excitation device 5 is disposed at one side of the middle section of the movable reed 2, so that the gas flows are respectively directed to two ends of the bridge movable reed under the guidance of the bottom shell 53 and the piston 52 after the ignition and explosion of the movable reed 2, and the arc extinguishing medium 54 reaches the area between the fixed contacts 1 and the movable reed 2 more directly.

The electromagnetic driving mechanism 4 is used for driving the movable reed 2 to move, referring to fig. 7-8, the electromagnetic driving mechanism 4 specifically comprises a static iron core 41, a coil 42, a movable iron core 43, a push rod assembly 44, a return spring 45, a first yoke iron piece 46, a second yoke iron piece 47 and a magnetic conduction barrel 48, wherein the first yoke iron piece 46, the second yoke iron piece 47 and the magnetic conduction barrel 48 are used for transmitting magnetic force lines and improving magnetic energy utilization rate, the lower end of the push rod assembly 44 is fixedly connected with the movable iron core 43, and the upper end of the push rod assembly is in linkage connection with the movable reed 2. The return spring 45 has one end acting on the stationary core 41 and the other end acting on the movable core 43. Energizing the coil 42 to make the static iron core 41 attract the movable iron core 43 to move upwards, so that the push rod 44 pushes the movable reed 2 upwards; when the coil 42 is deenergized, the electromagnetic driving mechanism 4 is reset under the elastic force of the reset spring 45. The electromagnetic driving mechanism 4 is used as a common direct-acting magnetic circuit structure, and the operation principle of the electromagnetic driving mechanism is not described in detail in this example.

The present embodiment illustrates the function and effect of the pyrotechnic actuator 5 in a relay structure, and the same structure can be applied to other switching devices, such as contactors, in addition to relays.

Example 2:

the present embodiment proposes a relay similar in structure to the relay of embodiment 1, the only difference being that the present embodiment employs a different bottom case structure of the pyrotechnic activation device. Referring to fig. 9 (a) and 9 (b), in this embodiment, the bottom shell 53A is a multi-stage structure with gradually shrinking radial dimensions from top to bottom, and since the lower end of the bottom shell 53A is in a shrinking shape, the impact force generated when the pyrotechnic excitation device detonates can be collected on a small step at the lower end of the bottom shell 53A, so as to increase local capacity, thereby enhancing the capacity of the piston to break the bottom shell 53A, accelerating the breaking of the movable reed 2 by the piston, and meanwhile, the arc extinguishing medium can be stored at an inner step of the bottom shell 53A.

Example 3:

the present embodiment proposes a relay similar in structure to the relay of embodiment 2, the only difference being that the present embodiment employs a different bottom case structure of the pyrotechnic activation device. Referring to fig. 10 (a) and 10 (B), in this embodiment, the bottom shell 53B is a tapered structure with a radial dimension gradually shrinking from top to bottom (i.e. toward the movable spring). Similarly, since the lower end of the bottom shell 53B is contracted, the impact force generated when the pyrotechnic excitation device detonates can be collected at the lower end of the bottom shell 53B, so as to increase the local capacity, thereby enhancing the capacity of the piston to break the bottom shell 53B and accelerating the breaking of the movable reed 2 by the piston. .

In both the present embodiment and embodiment 2, the bottom case is configured to gradually shrink in the radial direction from top to bottom, and in addition to the "step-shaped shrink" and the "taper shrink" set forth in the present embodiment and embodiment 2, in other embodiments, the "step-shaped shrink" and the "taper shrink" may be combined in multiple stages to achieve shrinkage, and other radial shrinkage in regular or irregular shapes may be possible.

Example 4:

this embodiment proposes a relay which is similar in construction to the relay of embodiment 1, the only difference being that this embodiment employs a different piston construction of the pyrotechnic actuator. In this embodiment, the piston is in a shape that is contracted from top to bottom (i.e. towards the movable reed), the force application area is reduced, and the force applied to the bottom shell and the movable reed is enhanced, so that the bottom shell can be broken more quickly, and the movable reed can be pushed to break rapidly. The contracted shape of the lower end of the piston can be realized by adopting a conical contraction, a step-shaped contraction or a contraction structure of combining a conical shape and a step shape, and the piston with the contracted lower end shown in fig. 11 and 12 is feasible.

Example 5:

the present embodiment proposes a relay similar to the relay of embodiment 1, except that in this embodiment, the arc extinguishing medium is stored in the piston, as shown in fig. 13, the piston 52C is a cylinder structure with a central cavity, the arc extinguishing medium 54A is stored in the piston 52C, and the lower end 52C-1 of the piston 52C (i.e. the striking part of the piston 52C) is a fragile structure with a thinner thickness, preferably the lower end 52C-1 of the piston 52C is made of a fragile material such as bakelite or PBT plastic, and when the piston 52C strikes downward, the lower end of the lower end 52C-1 is cracked due to the impact so that the arc extinguishing medium 54A is released.

In addition to the piston structure with the upward opening of the present embodiment and embodiment 1, the piston may also be a sealing structure with a closed cavity, and when the piston structure with the sealed cavity is adopted, the arc extinguishing medium is stored in the piston and has good sealing performance, so that the arc extinguishing medium can be realized by adopting other arc extinguishing mediums such as gaseous sulfur hexafluoride or liquid transformer oil besides quartz sand.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. Switching device with pyrotechnical excitation device, including switching device body and the pyrotechnical excitation device of setting on switching device body, switching device body is including fixed quiet contact portion and movable contact portion in order to carry out switching function, its characterized in that: the automatic switching device comprises a switching device body, and is characterized by further comprising a pyrotechnic excitation device which is of an independent modularized structure, wherein the pyrotechnic excitation device serving as an independent module is fixedly arranged on the switching device body from the outside of the switching device body, and ignites gunpowder to generate explosion impact force for pushing the movable contact part to be far away from the static contact part according to the load condition of the switching device body so as to assist the switching device to be rapidly disconnected.

2. Switching device with pyrotechnic excitation device according to claim 1, characterized in that: the switching device body comprises an outer shell, the movable contact part is arranged in the outer shell, and the pyrotechnic excitation device stretches into the outer shell to be arranged on one side of the movable contact part.

3. Switching device with pyrotechnic excitation means according to claim 2, characterized in that: the pyrotechnic excitation device comprises an exciter, a piston and a bottom shell, wherein the exciter and the bottom shell are fixedly connected, the bottom shell is of a hollow structure, the piston is installed in the bottom shell in a matched mode, the bottom shell stretches into the outer shell and faces the movable contact part, when the pyrotechnic excitation device excites, the exciter ignites gunpowder and pushes the piston to break the bottom shell through fuel gas, and the piston moves towards the movable contact part under the guiding action of the bottom shell so as to push the movable contact part to be far away from the static contact part.

4. A switching device with pyrotechnic activation means according to claim 3, characterized in that: the bottom case is a structure that gradually contracts in a direction toward the movable contact portion.

5. A switching device with pyrotechnic activation means according to claim 3, characterized in that: the piston is configured to gradually contract in a direction toward the movable contact portion.

6. A switching device with pyrotechnic activation means according to claim 3, characterized in that: and after the piston breaks through the bottom shell, the arc extinguishing medium is released to the contact inner cavity through the breaking of the piston or the bottom shell so as to perform arc extinguishing treatment on the arc between the static contact part and the movable contact part.

7. A switching device with pyrotechnic activation means according to claim 3, characterized in that: the exciter comprises a hollow exciter base, a first flanging is arranged at one end of the exciter base, a second flanging is arranged at one end of the bottom shell, and the first flanging and the second flanging are butted and fixed, so that the exciter and the bottom shell are fixedly connected.

8. The switching device with pyrotechnic activation device according to claim 7, wherein: the second flanging is welded and fixed with the outer shell, and an annular convex rib for improving welding stability is arranged on the second flanging.

9. The switching device with pyrotechnic activation device according to claim 7, wherein: the exciter also comprises a connector, an igniter and a sealing ring, wherein the connector, the igniter and the sealing ring are fixedly installed inside the exciter base, the connector is clamped and fixed on the inner wall of the exciter base, the sealing ring is pressed into the exciter base in an interference mode, one end of the sealing ring compresses the igniter towards the connector, and the other end of the sealing ring compresses the piston towards the bottom shell.

10. Switching device with pyrotechnic excitation means according to claim 2, characterized in that: the switch electrical appliance body further comprises a ceramic cover which is arranged inside the outer shell and covers the contact parts of the static contact part, the movable contact part and each other, a jack is arranged on the ceramic cover, and one end of the pyrotechnic excitation device penetrates through the jack to be welded and fixed on the ceramic cover and seal the jack.

11. Switching device with pyrotechnic excitation device according to claim 1, characterized in that: the pyrotechnic excitation device is fixedly connected to the switching device body in a detachable mode.

12. Switching device with pyrotechnic excitation device according to any of claims 1-11, characterized in that: the switching device is a direct-current high-voltage relay.

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