CN216902709U - Switching device with pyrotechnic excitation device - Google Patents

Abstract

The utility model 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 modular structure, and the pyrotechnic excitation device 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 modular structure, the pyrotechnic excitation device is independent of the relay body, can be produced independently and then fixedly mounted on the relay. Production, the transportation of fireworks formula excitation device are easily managed and controlled, and part is small in quantity, easily assembly, and the standardization of spare part also changes the realization, reaches to fall the weight and falls the purpose that originally put forward the performance.

Description

Switching device with pyrotechnic excitation device

Technical Field

The utility model 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 change of electrical technology, the load requirement of the main loop is higher and higher, and the requirement of short circuit resistance of the relay is also higher and higher. In recent years, manufacturers propose a main loop short-circuit resistance of 20KA or even 30KA, and under such a high short-circuit current, a great short-circuit electric repulsion force occurs between contacts of the relay, so that the movable contact spring is forced to be repelled from the fixed contact. In order to resist the short circuit electric repulsion force to maintain the closed state of the movable spring and the movable contact, the electric repulsion force has to be resisted by increasing the pressure of the contact spring or the closing magnetic attraction force of the movable spring (namely, the magnetic attraction force for driving the movable spring to move and close through an electromagnetic driving mechanism). However, when the pressure of the contact spring or the closing magnetic attraction of the movable spring piece is increased, the normal breaking action of the movable spring piece is also influenced, and when the short-circuit current is further increased, if the short-circuit current is not broken timely, the safety of a loop cannot be guaranteed. Therefore, in some prior art, a pyrotechnic actuator (pyrotechnical activator) is arranged to help the relay to perform rapid breaking, when a system monitors that a short-circuit current reaches a critical value, the system triggers the actuator to ignite gunpowder, and a movable contact (movable contact spring) is pushed to rapidly break by means of the impact force of gunpowder explosion, so that a loop protection effect is realized.

The existing pyrotechnic excitation device is usually integrated inside the relay and is fixed with the relay into a whole, 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 changed, and when the load current changes to some extent, the pyrotechnic excitation device can not be changed alone, but the whole relay needs to be changed into other specifications, so that the relay is inconvenient.

SUMMERY OF THE UTILITY MODEL

Therefore, in view of the above problems, the present invention provides a switching device with a pyrotechnic excitation device with an optimized structure.

The utility model is realized by adopting the following technical scheme:

the utility model 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 an independent modular 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 gunpowder is ignited according to the load condition of the switching device body to generate explosion impact force for pushing the dynamic contact part to be far away from the static contact part so as to assist the switching device to be quickly disconnected.

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

In one embodiment, it is preferable that the pyrotechnic excitation device includes an exciter, a piston, and a bottom case, the exciter and the bottom case are fixedly engaged, the bottom case is of a hollow structure, the piston is fittingly installed in the bottom case, the bottom case extends into the outer case and faces the movable contact portion, when the pyrotechnic excitation device is excited, the exciter ignites powder and pushes the piston to burst through the bottom case by gas, and the piston moves towards the movable contact portion under the guiding action of the bottom case, so as to push the movable contact portion away from the static contact portion.

In order to collect the impact force generated by the detonation of the pyrotechnic excitation device 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 gradually contracted in a direction toward the movable contact part.

In order to break the bottom shell more quickly and push the movable spring to be disconnected, in one embodiment, the piston is gradually contracted towards the movable contact part.

In order to improve the arc extinguishing capability of the switching device, in one embodiment, preferably, an arc extinguishing medium is further stored in the piston or the bottom case, and after the piston breaks through the bottom case, the arc extinguishing medium is released to the contact inner cavity through the breaking of the piston or the bottom case, so that the arc between the static contact portion and the movable contact portion is extinguished.

In one embodiment, the exciter comprises a hollow exciter base, wherein the exciter base is provided with a first flange at one end and a second flange at one end, and the first flange and the second flange are abutted and fixed to each other so that the exciter and the bottom shell are engaged and fixed.

In one embodiment, the second flange is preferably welded and fixed to the outer shell, and the second flange is provided with an annular rib for improving welding stability.

Based on manufacturing and installation considerations, in one embodiment, it is preferable that the exciter further includes a connector, an igniter, and a sealing ring, the connector is fixedly clamped on an inner wall of the exciter base, the sealing ring is press-fitted into the exciter base in an interference manner, one end of the sealing ring presses the igniter toward the connector, and the other end presses the piston toward the bottom case.

In order to improve the electrical performance, in one embodiment, preferably, the switching apparatus body further includes a ceramic cover covering the inside of the outer casing and covering the static contact portion, the dynamic contact portion and the mutual contact portion, the ceramic cover is provided with a jack, and one end of the pyrotechnic excitation device is welded and fixed on the ceramic cover through the jack and seals the jack.

In order to quickly replace the pyrotechnic excitation device according to the load demand, in one embodiment, the pyrotechnic excitation device is preferably fixedly connected to the switching apparatus body in a detachable manner.

In one embodiment, the switching device is preferably a dc high-voltage relay.

The utility model has the following beneficial effects: in the utility model, the pyrotechnic excitation device is a modular structure, is independent of the relay body, and can be produced independently and then fixedly mounted on the relay. Production, the transportation of fireworks formula excitation device are easily managed and controlled, and part is small in quantity, easily assembly, and the standardization of spare part also changes the realization, reaches to fall heavy this and carries the performance purpose of falling.

Drawings

Fig. 1 is a cross-sectional view of a relay having a pyrotechnic excitation device in embodiment 1 (the relay is in an open state);

FIG. 2 is a schematic view of the pyrotechnic excitation device of example 1 inserted and fixedly attached to a ceramic cover;

FIG. 3 is an exploded view of the structure of a pyrotechnic excitation device in example 1;

FIG. 4 is a sectional view of a pyrotechnic excitation device in accordance with embodiment 1;

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

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

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

FIG. 8 is a cross-sectional view of a relay having a pyrotechnic excitation device (pyrotechnic excitation device excitation) in example 1;

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

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

FIG. 10(a) is a schematic view of a bottom case in embodiment 3;

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

FIG. 11 is a schematic view of a possible structure of the piston in embodiment 4;

FIG. 12 is a schematic view showing another possible structure of the piston in embodiment 4;

fig. 13 is a schematic illustration of the arc-extinguishing medium stored in the piston in embodiment 5.

Detailed Description

To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. The components in the drawings are not necessarily to scale, and similar reference numerals are generally used to identify similar components.

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

Example 1:

referring to fig. 1-2, as a preferred embodiment of the present invention, a relay with a pyrotechnic excitation device is provided, which includes a relay body 100 and a pyrotechnic excitation device 5 mounted and attached on the relay body 100, where the relay body 100 includes a static contact 1 (as a static contact) and a movable contact 2 (as a movable contact) for implementing connection or disconnection of the relay body 100, the relay body 100 further includes an outer housing 3, one end of the static contact 1 is exposed out of the outer housing 3 and electrically connected to an external load, and the other end of the static contact extends into the outer housing 3, and the movable contact 2 is disposed inside the outer housing 3 and connected to an electromagnetic driving mechanism 4. Wherein, static contact 1 is equipped with the internal thread, can be used for with external wiring end threaded connection fixed. The movable reed 2 is a bridge type movable reed, under the action of the electromagnetic driving mechanism 4, the movable reed 2 can move relatively close to or far away from the static contacts 1, and when the movable reed 2 is simultaneously contacted with the two static contacts 1, the communication of loads is realized. For convenience of description, it is defined that the fixed contact 1 is relatively located above the movable spring plate 2, and the movable spring plate 2 is relatively located 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 and covers the lower end of the static contact 1 and the movable contact spring 2 (i.e. covers the contact point between the static contact 1 and the movable contact spring 2 and each other) to form a contact inner cavity, the contact point between the static contact 1 and the movable contact spring 2 is isolated from the outside air through the ceramic cover 6 to obtain high voltage resistance, and the relay can effectively ensure low contact resistance, long service life and high reliability. And when the relay is in short circuit, the arc resistance and high temperature resistance of the ceramic material can ensure that a loop under the short circuit arc is safe and reliable.

The outer casing 3 further comprises a base 32 and an upper cover 31 which are combined, the ceramic cover 6 is arranged in the upper cover 31, the pyrotechnic excitation device 5 is inserted from the outside of the ceramic cover 6 and fixedly connected onto the ceramic cover 6, the lower end of the pyrotechnic excitation device 5 extends into a contact inner cavity in the ceramic cover 6 to be right above the movable reed 2, and the upper cover 31 is covered on the ceramic cover 6 and the pyrotechnic excitation device 5 to complete the integral assembly of the relay. Referring to fig. 2, the pyrotechnic actuator 5 is an independent modular structure, and has a substantially cylindrical revolving structure, the upper end of the ceramic cover 6 is provided with a plug hole 61, and the lower end of the pyrotechnic actuator 5 passes through the plug hole 61 to extend into the contact cavity. The pyrotechnic excitation device 5 may be fixed to the ceramic cover 6 by welding, riveting, screwing, or the like, and in this embodiment, the pyrotechnic excitation device 5 is fixed to the ceramic cover 6 by brazing. In addition, in this embodiment, the top surface of the upper cover 31 has a through hole and a hollow cylindrical section which are abducted and matched with the two static contacts 1 and the one pyrotechnic excitation device 5, so that the top ends of the two static contacts 1 can be exposed out of the outer shell 3, and the exterior of the pyrotechnic excitation device 5 can be covered and protected. In addition, in order to improve electrical safety, protective baffles (not shown due to angle problems) are respectively extended from two sides of the outer wall of the hollow cylindrical section in a direction perpendicular to the paper surface of the figure. In other embodiments, the pyrotechnic excitation device 5 may also be fixedly connected to the outer housing 3, but in this embodiment, the pyrotechnic excitation device 5 is selectively and fixedly connected to the ceramic cover 6, so that the assembly process can be simplified, and the pyrotechnic excitation device 5 and the stationary contact 1 are fixedly assembled on the ceramic cover 6 and then the upper cover 31 is covered during final assembly.

Referring to fig. 3-6, pyrotechnic activation device 5 specifically includes an activator 51, a piston 52, and a bottom housing 53. The actuator 51 and the bottom case 53 are engaged and fixed one above the other, and the piston 52 is accommodated between the actuator 51 and the bottom case 53. Wherein the initiator 51 further comprises a hollow initiator base 512, and a connector 511, an igniter 513 and a sealing ring 514 fixedly mounted inside the initiator base 512. The exciter base 512 is a tubular structure, the lower end of the exciter base 512 is provided with a first flange 510, the bottom shell 53 is also a hollow tubular structure, the upper end of the bottom shell 53 is provided with a second flange 532, and the first flange 510 and the second flange 532 are butt-jointed 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 extends into the contact cavity of the ceramic cover 6, and the second flange 532 is fixed on the ceramic cover 6 by brazing, so that the pyrotechnic excitation device 5 and the ceramic cover 6 are fixedly connected. As shown in fig. 4, an annular rib 531 is disposed on a side of the second turned-up edge 532 facing the ceramic cover 6, and the annular rib 531 is disposed to further increase the soldering stability of the second turned-up edge 532 and the ceramic cover 6. In addition, since the first flange 510 and the second flange 532 form an expanded diameter portion which expands outward and further seal the insertion hole 61, the sealing property of the ceramic cover 6 can be ensured.

In this embodiment, the activator base 512 and the bottom housing 53 are engaged to form an outer housing of the pyrotechnic activation device 5. The connector 511, the igniter 513, the sealing ring 514 and the piston 52 are sequentially disposed inside the outer housing from top to bottom, and the connector 511 is connected to the lead 5131 of the igniter 513. The connector 511 is clamped 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 upwards compresses and fixes the igniter 513, the upper end and the lower end of the piston 52 are respectively supported by the sealing ring 514 and the bottom shell 53, the sealing ring 514 can achieve the effects of moisture prevention and air sealing, and the igniter 513 above the piston can be further compressed and the piston 52 below the piston can be further compressed by micro deformation generated by compression of the sealing ring 514, so that vibration and loosening are prevented.

Referring to fig. 7-8, the connector 511 is used for fixedly connecting the ignition lead of the monitoring and excitation circuit to transmit the excitation electrical signal emitted by the monitoring and excitation circuit to excite the igniter 513, and the monitoring and excitation circuit may emit the excitation electrical signal to conduct downward via the connector 511 after the monitoring current value (or the current climbing rate) reaches a certain threshold, and excite the igniter 513 to ignite. An air gap 50 is arranged between the piston 52 and the igniter 513, and after the igniter 513 ignites gunpowder, high-pressure gas is generated in the air gap 50 (namely, ignition is carried out), so that the piston 52 is pushed to downwards break through the bottom shell 53, the piston 52 pushes the movable spring piece 2 to downwards move, the movable spring piece 2 is helped to be separated from the contact with the static contact 1, and the quick breaking of the relay is realized.

The bottom case 53 is a hollow cylindrical structure, and the piston 52 is a rotary structure with a shaft hole fitted inside the bottom case 53, so that the bottom case 53 can provide a guiding function for the piston 52, and the piston 52 moves downward along the hollow cylindrical inner cavity of the bottom case 53 after the ignition tool 513 ignites.

In this embodiment, the pyrotechnic actuator 5 is a modular structure that is independent of the relay body, and can be separately manufactured and then fixedly mounted to the relay. Production, the transportation of fireworks formula excitation device 5 are easily managed and controlled, and part is small in quantity, easily assembly, and the standardization of spare part also changes the realization, reaches to fall heavy this and carries the performance purpose. And a lead 5131 extending from the ignition tool 513 is connected with the ignition lead of the monitoring excitation circuit through the connector 511, so that the distance between the gunpowder in the ignition tool 513 and the leading-out end of the ignition lead is far, the temperature rise is low, and the temperature resistance requirement of the medicament is reduced.

As a preferred example, the pyrotechnic excitation device 5 in this embodiment is applied to a ceramic-sealed relay, and specifically, the pyrotechnic excitation device 5 is welded to the ceramic cover 3, so that the welding tightness is good, the sealing performance and the anti-vibration performance of the pyrotechnic excitation device 5 are better, the outer shell of the pyrotechnic excitation device 5 is simpler to form, and the product height is lower. In other embodiments, the pyrotechnic excitation device 5 may also be applied to relays with other structures, as long as a plug hole (such as the plug hole 61 of the embodiment) is formed on the relay body for the insertion of the pyrotechnic excitation device 5, and the pyrotechnic excitation device 5 is attached to the relay through a fixed connection means. The pyrotechnic excitation device 5 can also be detachably connected (e.g., screwed) to be fixed to the relay body, 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 disposed in the bottom shell 53, and when the pyrotechnic excitation device 5 is excited, the bottom shell 53 is broken downward by the piston 52 to release the arc extinguishing medium 54 into the contact cavity of the ceramic cover 6, so as to perform arc extinguishing treatment on the contact gap between the stationary contact 1 and the movable contact spring 2, further accelerate the arc extinguishing capability when the contact is disconnected, and improve the safety of short circuit of the product. In this embodiment, the arc-extinguishing 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 uniformly spread in the contact inner cavity very rapidly along with the explosion gas, and is not limited by the shapes of the static contact 1 and the movable contact 2 and the inner contour of the contact inner cavity to the greatest extent, so that the arc-extinguishing effect can be directly exerted in a short time. In this embodiment, the static contact 1 is disposed at two ends of the bridge-type movable reed, and the pyrotechnic excitation device 5 is correspondingly disposed at one side of the middle position of the movable reed 2, and the expanded gas after the movable reed 2 is ignited and exploded is guided by the bottom shell 53 and the piston 52, and the gas flow is respectively guided to two ends of the bridge-type movable reed, so that the arc-extinguishing medium 54 can more directly reach the area between the static contact 1 and the movable reed 2.

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 includes a stationary 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 cylinder 48, the first yoke iron piece 46, the second yoke iron piece 47 and the magnetic conduction cylinder 48 are used for transmitting magnetic lines and improving the 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 iron core 41 and the other end acting on the movable iron core 43. The coil 42 is electrified to lead the static iron core 41 to attract the movable iron core 43 to move upwards, and the push rod 44 pushes the movable reed 2 upwards to move upwards; when the coil 42 is deenergized, the electromagnetic drive mechanism 4 is reset by the elastic force of the reset spring 45. The electromagnetic driving mechanism 4 is a conventional direct-acting magnetic structure, and the operation principle thereof is not described in detail here.

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

Example 2:

this embodiment proposes a relay having a structure similar to that of the relay of embodiment 1, the only difference being that this embodiment employs a different bottom case structure of the pyrotechnic activation device. Referring to fig. 9(a) and 9(b), in the present embodiment, the bottom shell 53A is a multi-step structure with radial dimension gradually shrinking 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 is ignited can be collected on the small step at the lower end of the bottom shell 53A, so as to increase the local capacity, thereby enhancing the capacity of the piston to break the bottom shell 53A, accelerating the piston to push the movable spring piece 2 to be disconnected, and meanwhile, the arc extinguishing medium can be stored at the step inside the bottom shell 53A.

Example 3:

this embodiment proposes a relay having a structure similar to that of embodiment 2, the only difference being that this embodiment employs a different bottom case structure of the pyrotechnic activation device. Referring to fig. 10(a) and 10(B), in the present embodiment, the bottom shell 53B is a tapered structure that gradually shrinks in radial dimension from top to bottom (i.e., toward the movable spring). Similarly, since the lower end of the bottom shell 53B is in a contracted shape, the impact force generated when the pyrotechnic excitation device is ignited can be collected at the lower end of the bottom shell 53B, so that the local capacity can be increased, the capacity of the piston for breaking the bottom shell 53B can be enhanced, and the piston can be accelerated to push the movable spring piece 2 to be broken.

In both the embodiment and the embodiment 2, the structure of the bottom shell is set to gradually shrink from the top to the bottom in the radial dimension, except that the embodiment and the embodiment 2 propose "step-type shrinkage" and "conical shrinkage", in other embodiments, the "step-type shrinkage" and "conical shrinkage" may be combined in multiple stages to realize shrinkage, and other regular or irregular shapes may be adopted to perform radial shrinkage.

Example 4:

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

Example 5:

the present embodiment provides a relay, which has a structure similar to that of the relay of embodiment 1, except that in this embodiment, the arc-extinguishing medium is stored in a piston, as shown in fig. 13, the piston 52C is a cylindrical 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 impact portion of the piston 52C) is a fragile structure with a relatively thin 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 impacts downward, the lower end 52C-1 fractures due to impact fracture, so that the arc-extinguishing medium 54A is released.

In addition to the piston structure with the upward opening according to the present embodiment and embodiment 1, the piston may also be a sealing structure with a sealed cavity, and when the piston structure with the sealed cavity is adopted, since the arc-extinguishing medium is stored in the piston with good sealing performance, the arc-extinguishing medium may be implemented by using other arc-extinguishing media such as gaseous sulfur hexafluoride or liquid transformer oil besides quartz sand.

While the utility model 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 detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (12)

1. Switching apparatus with pyrotechnic composition excitation device, including switching apparatus body and pyrotechnic composition excitation device of setting on the switching apparatus body, the switching apparatus body moves the contact site and in order to carry out switch function, its characterized in that including fixed quiet contact site and movable: the switch electric appliance is characterized by further comprising a pyrotechnic excitation device which is of an independent modular structure, the pyrotechnic excitation device serving as an independent module is fixedly installed on the switch electric appliance body from the outside of the switch electric appliance body, and powder is ignited according to the load condition of the switch electric appliance body to generate explosion impact force for pushing the movable contact part to be far away from the static contact part so as to assist the switch electric appliance to be quickly disconnected.

2. Switching appliance with pyrotechnic excitation device according to claim 1, characterized in that: the switch electric appliance body comprises an outer shell, the movable contact part is arranged inside the outer shell, and the pyrotechnic excitation device extends into the outer shell and is just opposite to the movable contact part on one side.

3. Switching device with pyrotechnic excitation device according to claim 2, characterized in that: the pyrotechnic excitation device comprises an exciter, a piston and a bottom shell, the exciter is fixedly connected with the bottom shell, the bottom shell is of a hollow structure, the piston is installed in the bottom shell in a matched mode, the bottom shell extends into 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 through the bottom shell through gas, and the piston moves towards the movable contact part under the guiding effect of the bottom shell so as to push the movable contact part to be far away from the static contact part.

4. Switching appliance with pyrotechnic excitation device according to claim 3, characterized in that: the bottom shell is a structure which gradually shrinks towards the direction of the movable contact part.

5. Switching appliance with pyrotechnic excitation device according to claim 3, characterized in that: the piston is configured to be gradually contracted in a direction toward the movable contact portion.

6. Switching appliance with pyrotechnic excitation device according to claim 3, characterized in that: and an arc extinguishing medium is also stored in the piston or the bottom shell, and after the piston breaks through the bottom shell, the arc extinguishing medium is released through the breakage of the piston or the bottom shell so as to perform arc extinguishing treatment on the electric arc between the static contact part and the movable contact part.

7. Switching appliance with pyrotechnic excitation device 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 in butt joint and fixed so that the exciter and the bottom shell are in joint and fixed.

8. Switching device with pyrotechnic excitation device according to claim 7, characterized in that: the second flanging is welded and fixed with the outer shell, and the second flanging is provided with an annular convex rib for improving welding stability.

9. Switching device with pyrotechnic excitation device according to claim 7, characterized in that: the exciter further comprises a connector, an igniter and a sealing ring which 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 is used for enabling the igniter to press the connector tightly, and the other end of the sealing ring is used for enabling the piston to press the bottom shell tightly.

10. Switching device with pyrotechnic excitation device according to claim 2, characterized in that: the switch electric appliance body is characterized in that the switch electric appliance body is further provided with a ceramic cover which is arranged inside the outer shell and covers the static contact part and the dynamic contact part and the mutual contact part, a jack is arranged on the ceramic cover, and one end of the pyrotechnic excitation device penetrates through the jack and is welded and fixed on the ceramic cover and seals the jack.

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

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

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