CN216902708U - Switching device with pyrotechnic excitation device - Google Patents

Abstract

The utility model relates to a switching apparatus with a pyrotechnic excitation device, on the basis of having the pyrotechnic excitation device, a magnetic conduction ring component is also arranged on a movable contact part of the switching apparatus, and the magnetic conduction ring component can improve the short-circuit resistance of the switching apparatus and can be applied to occasions with high short-circuit resistance requirements; the second mode can select an over-travel elastic part with a small elastic coefficient k value or reduce the stroke quantity of the over-travel elastic part, so that the quantity of the fire required by the pyrotechnic excitation device is reduced, and the reliability of the pyrotechnic excitation device is improved; thirdly, the breaking of the contact can be accelerated, and the electrical safety is improved.

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 switch state 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 capability 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 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.

However, when the pyrotechnic excitation device is applied to a relay with a large short-circuit resistance, the required explosion impact force is also larger, so that the amount of the fire carried by the pyrotechnic excitation device is also larger, and the pyrotechnic excitation device is not beneficial to safety control in the production and assembly processes.

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 direct-acting electromagnetic driving mechanism and a movable contact part and a static contact part which are fixedly arranged so as to execute a switching function, the linear electromagnetic driving mechanism comprises a push rod component, the movable contact part is assembled in the push rod component through an elastic piece, so as to realize the overtravel contact with the static contact part, and also comprises at least one group of magnetic conductive ring components, the magnetic conductive ring components comprise an upper magnetic conductor and a lower magnetic conductor which are arranged oppositely, the upper magnetizer is fixedly connected with the upper end of the push rod component, the lower magnetizer is fixedly connected with the movable contact part, the pyrotechnic activation device includes a pushing medium for performing a downward movement, the pushing medium corresponding to an upper end of a position of the push rod assembly.

Wherein, the pushing medium is high-pressure fuel gas generated by the ignition of the pyrotechnic excitation device, or the pushing medium is a piston.

In order to improve the short-circuit resistance of the switching device, in one embodiment, n groups of the magnetic conducting ring assemblies are preferably arranged, wherein n is more than or equal to 2.

Based on manufacturing and installation considerations, in one embodiment, it is preferable that the upper magnetizer has a straight-line structure and is fixed and horizontally placed above the movable contact portion, the lower magnetizer has a U-shaped structure, the lower magnetizer is fixedly connected with the movable contact portion and semi-surrounds at least part of the current-carrying conductors of the movable contact portion, and an opening of the U-shaped lower magnetizer is disposed toward the upper magnetizer, so that the upper magnetizer and the lower magnetizer form a magnetic conductive loop.

Based on manufacturing and installation considerations, in one embodiment, it is preferable that the push rod assembly includes a constraint frame, the movable contact portion penetrates through the constraint frame, the elastic member is fixedly installed inside the constraint frame, and the movable contact portion is abutted against the upper end of the constraint frame by an elastic force of the elastic member, the upper magnetizer is fixedly connected to the inner side of the top end of the constraint frame so as to be disposed above the movable contact portion, and after the constraint frame moves upward to abut against the movable contact portion and the stationary contact portion, the straight-moving electromagnetic driving mechanism drives the constraint frame to move upward continuously to compress the elastic member, so that a certain magnetic air gap exists between the upper magnetizer and the lower magnetizer.

In order to reduce the requirement of the elastic force of the over-travel elastic part and thus reduce the amount of the fire of the pyrotechnic excitation device, in one embodiment, preferably, when the movable contact part and the static contact part are abutted, the elastic force of the elastic part is smaller than the maximum electric repulsion force between the movable contact part and the static contact part.

In order to facilitate manufacturing, transportation and assembly of the pyrotechnic excitation device, in one embodiment, the pyrotechnic excitation device is preferably an independent modular structure, the pyrotechnic excitation device as an independent module is fixedly mounted on the switchgear body from the outside of the switchgear body, and the pyrotechnic excitation device generates explosion impact force by igniting gunpowder to force the movable contact part to be far away from the static contact part so as to rapidly disconnect the switchgear.

In one embodiment, it is preferable that the switching apparatus body includes a ceramic cover surrounding at least the stationary contact portion and the movable contact portion and a contact portion of each other to form a contact cavity, and the ceramic cover is provided with a plug hole through which one end of the pyrotechnic excitation device protrudes into the contact cavity to be disposed opposite to the movable contact portion.

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

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.

Wherein, preferably, the switching device is a direct current high voltage relay.

The utility model has the following beneficial effects: the utility model is also provided with the magnetic conduction ring component on the basis of the switching apparatus with the pyrotechnic excitation device, which can improve the short-circuit resistance of the switching apparatus and can apply the switching apparatus in occasions with high short-circuit resistance requirements; the requirement of an over-travel spring on the contact pressure of the movable reed can be reduced, the over-travel elastic part with a small elastic coefficient k value is selected or the stroke quantity of the over-travel elastic part is reduced, so that the quantity of the fire required by the pyrotechnic exciting device is reduced, the reliability of the pyrotechnic exciting device is improved, meanwhile, the contact holding force of a movable iron core in the electromagnetic driving mechanism can be correspondingly reduced, the diameter of the movable iron core, the elastic force of a reset spring, the suction force of a coil and the like can be reduced, the quantity of the fire required by the pyrotechnic exciting device is further reduced, and the reliability of the pyrotechnic exciting device is improved; thirdly, the breaking of the contact can be accelerated, and the electrical safety is improved.

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 the 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 example 1;

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

fig. 7 is a sectional view of a relay having a pyrotechnic excitation device in embodiment 1 (the relay is in a conductive 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 is a schematic perspective view of a putter assembly according to embodiment 1;

fig. 10 is an exploded view of the construction of the push rod assembly of embodiment 1;

FIG. 11 is a schematic view (front view) of the restraint frame flattened by the impact of the piston in example 1;

FIG. 12 is a schematic view (perspective view) showing the restraint frame flattened by the impact of the piston in example 1;

fig. 13 is a schematic view of the movable spring and the magnetic conductive ring assembly in embodiment 1;

fig. 14 is a schematic view of the magnetic conductive ring assembly of embodiment 1 generating attraction force to resist the electric repulsion force of short circuit current;

fig. 15 is a schematic view of the movable spring and the magnetic conductive ring assembly in embodiment 2;

fig. 16 is a schematic view of the movable spring and the magnetic conductive ring assembly in embodiment 3.

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. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The utility model will now be further described with reference to the accompanying drawings and 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 the safety and reliability of a loop under the short circuit arc.

The outer casing 3 further comprises a base 32 and an upper cover 31 which are combined, the ceramic cover 6 is arranged inside the upper cover 31, the pyrotechnic excitation device 5 is fixedly connected to the ceramic cover 6 by being inserted from the outside of 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 contact spring piece 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 (as the propelling medium), 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. 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 exciter base 512 and the bottom housing 53 are engaged and secured to form the outer housing of the pyrotechnic exciter 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 a 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 piston 52 is used to perform the downward movement of the pyrotechnic activation device, but in other embodiments, the pyrotechnic activation device may not be provided with a piston, and only relies on the igniter 513 to ignite the gunpowder and generate high-pressure gas to burst the bottom shell 53 and push the movable reed 2. That is, the pushing medium for pushing the movable reed 2 downward to realize the pyrotechnic actuator may be either the high-pressure gas itself or the piston 52.

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, when the pyrotechnic excitation device 5 is excited, the piston 52 breaks through the bottom shell 53 downwards to release the arc extinguishing medium 54 in the contact inner 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 spring 2, further accelerate the arc extinguishing capability when the contact is disconnected, and improve the safety of product short circuit. In this embodiment, the arc-extinguishing medium 54 is quartz sand. In addition to storing the arc-extinguishing medium 54 in the bottom case 53, in other embodiments, the arc-extinguishing medium 54 may also be stored in the piston 52, for example, the lower end (striking portion) of the piston 52 is configured as a fragile cylinder structure with a central cavity, and when the piston 52 strikes the movable spring 2, the lower end of the piston 52 is cracked by impact to release the arc-extinguishing medium 54. 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 and extremely rapidly spread in the contact inner cavity along with the explosive gas, and is not limited by the shapes of the static contact 1 and the movable contact piece 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.

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 return spring 45. The electromagnetic driving mechanism 4 is a conventional direct-acting magnetic circuit structure, and the operation principle thereof is not described in detail in this example.

Referring to fig. 9-10, the push rod assembly 44 includes a push rod 441, a spring seat 442, and a U-shaped support 443, the push rod 441 is used for outputting the driving force of the electromagnetic driving mechanism 4, and the lower end of the push rod is fixedly connected to the movable iron core 43 (see fig. 8), and the upper end of the push rod is fixedly connected to the spring seat 442. The U-shaped support 443 is a sheet-shaped structure and includes a top plate 4431 disposed above the spring seat 442 and two side plates 4432 connected to two ends of the top plate 4431 and extending downward, wherein lower ends of the two side plates 4432 are fixedly connected to two ends of the spring seat 442, so that the spring seat 442 and the U-shaped support 443 are connected to form a rectangular hollow restraint frame 400. The lower end of the over travel spring 445 (as an over travel elastic member) abuts against the spring seat 442, and the movable spring piece 2 penetrates through the restraint frame 400 and abuts against the top plate 4431 under the elastic force of the over travel spring 445, so that the over travel spring 445 and the movable spring piece 2 are stably mounted in the restraint frame 400 by the elastic force of the over travel spring 445.

Referring to fig. 11 and 12, in the present embodiment, a restraint frame 400 is formed by using a spring seat 442 and a U-shaped support 443, when the pyrotechnic excitation device 5 is excited, a piston 52 impacts downward on the restraint frame 400, so that the push rod assembly 44 and the movable spring plate 2 move downward, after the spring seat 442 is stopped by the internal structure of the relay, the overtravel spring 445 is further compressed under the impact force of the piston 52, two side plates 4432 of the U-shaped support 443 are pressed and bent to generate plastic deformation, so that the whole restraint frame 400 is flattened and cannot be restored, the heights of the whole push rod assembly 44 and the movable spring plate 2 are further reduced, and the U-shaped support 443 spans over the plate-shaped movable spring plate 2, so that the movable spring plate 2 can be restrained from rebounding towards the stationary contact 1. And because the piston 52 impacts downwards, the restraint frame 400 is compressed and flattened, the contact gap between the movable spring leaf 2 and the static contact 1 can be further pulled open, and the short-circuit safety is improved. From another perspective, since the restraint frame 400 formed by the spring seat 442 and the U-shaped support 443 in this embodiment can be compressed and flattened, compared with other schemes in which the push rod assembly cannot be compressed and flattened, when the push rod assembly 44 and the movable spring plate 2 in this embodiment are impacted by the piston 52, only a smaller downward movement distance (after the restraint frame 400 is overlapped and flattened and compressed in the compression space) is required to ensure that a sufficiently large contact gap is opened, so the height space of the contact cavity of the ceramic cover 6 can also be set to be smaller, and can be kept consistent with the specification of a relay without the pyrotechnic excitation device 5 (the existing relay with the pyrotechnic excitation device 5 needs to increase the height space of the contact cavity), and thus the height volume of the whole relay can also be reduced.

Referring to fig. 9-14, the push rod assembly 44 further includes at least one set of magnetic conductive ring assemblies, which includes an upper magnetic conductor 447 and a lower magnetic conductor 446, and the upper magnetic conductor 447 and the lower magnetic conductor 446 form a magnetic conductive loop surrounding at least a part of the current-carrying conductor of the movable contact spring 2, so that, when a large short-circuit current flows through the movable contact spring 2, the movable contact spring 2 is pushed upwards by the magnetic attraction of the upper magnetic conductor 447 to the lower magnetic conductor 446 to resist the electric repulsion force caused by the short-circuit current. Specifically, in this embodiment, the upper magnetizer 447 is in a straight-line structure, the lower magnetizer 446 is in a U-shaped structure, the upper magnetizer 447 is fixedly connected to the lower side of the top plate 4431 and is disposed above the movable spring 2, the lower magnetizer 446 is fixedly connected to the movable spring 2 and semi-surrounds a part of the current-carrying conductor of the movable spring 2, and the opening of the U-shaped lower magnetizer 446 faces the upper magnetizer 447, so that the upper magnetizer 447 and the lower magnetizer 446 form a magnetic conductive loop.

Because the upper magnetizer 447 is fixedly connected to the top plate 4431, and the lower magnetizer 446 is fixedly connected to the movable spring leaf 2, when the relay is in a conducting state, that is, the push rod assembly 44 pushes the movable spring leaf 2 and the static contact 1 upwards to contact each other, the lower magnetizer 446 cannot continuously rise due to the stopping function of the static contact 1, but the spring seat 442 can further compress the over-travel spring 445, so that the constraint frame 400 can continuously rise, and a certain magnetic air gap exists between the upper magnetizer 447 and the lower magnetizer 446. At the same time, further compression of the overtravel spring 445 also effects an overtravel of the contacts in the on state of the relay.

In this embodiment, two sets of magnetic conduction ring assemblies are provided, wherein the through hole 21 is provided in the middle of the movable spring piece 2 in the width direction, two current-carrying conductors are separated from the movable spring piece 2 in the width direction through the through hole 21, and the two sets of magnetic conduction ring assemblies respectively surround two current-carrying conductors to form mutually independent magnetic conduction loops.

In addition to the use of the restraint frame 400 of this embodiment to secure the upper conductor 447, other embodiments may also use other securing structures, such as a rod passing through the movable spring 2 and secured to the end of the rod passing through the movable spring 2.

The "magnetic conductive ring assembly" proposed in this embodiment refers to that the upper magnetic conductor and the lower magnetic conductor can form an annular magnetic conductive loop, and specifically one of the upper magnetic conductor and the lower magnetic conductor is a straight-line structure, and the other is a U-shaped structure, and in other embodiments, the upper magnetic conductor and the lower magnetic conductor can both be straight-line structures, and such structures can also form an annular magnetic conductive loop (for example, a similar structure in patent CN 103038851B), and also belong to the category of the "magnetic conductive ring assembly" referred to in this embodiment.

As shown in fig. 14, in the present embodiment, two magnetic conductive loops are provided, so that magnetic pole surfaces (four magnetic pole surfaces in total) can be added, magnetic efficiency is improved, and attraction force is increased. When the movable reed 2 has a fault and large current, the two independent magnetic conduction loops, namely the magnetic conduction loop phi 1 and the magnetic conduction loop phi 2 generate attraction F to resist electric repulsion force generated by fault current between the movable reed and the static contact, so that the short-circuit current resistance is greatly improved. And the movable reed 2 is divided into two current-carrying conductors, so that current shunting can be realized, the shunting current on one current-carrying conductor is basically half of the fault current, the magnetic circuit cannot be magnetically saturated, the magnetic flux can be increased, and the generated attraction force can be increased.

For more structure and function of the magnetic conductive ring assembly (the upper magnetic conductor 447 and the lower magnetic conductor 446), refer to patent CN 209000835U.

The embodiment is provided with the magnetic conductive ring assembly, the short-circuit resistance of the relay can be improved, and the relay can be applied to occasions with high short-circuit resistance requirements; secondly, an over-travel spring with a small elastic coefficient k value can be selected or the compression amount of the over-travel spring is reduced, so that the reliability of the pyrotechnic excitation device 5 is improved; thirdly, the breaking of the contact can be accelerated, and the electrical safety is improved.

As described above, when the movable contact spring 2 has a large fault current, the magnetic conductive ring assembly can generate an upward magnetic attraction force on the movable contact spring 2 to assist in resisting an electric repulsion force generated by the large current of the load loop between the movable contact spring 2 and the static contact 1 (the magnetic attraction force can be increased synchronously with the increase of the electric repulsion force), so that the short-circuit current resistance is greatly improved, and the upper limit of the set value of the excitation current of the pyrotechnic excitation device can be increased; moreover, for the conventional relay without the magnetic conductive ring assembly, the pressure of the elastic force of the over travel spring on the movable contact spring 2 is used to resist the electric repulsion, because the electric repulsion at the instant of short circuit is very large (the short circuit current has not yet reached the threshold for exciting the pyrotechnic excitation device), the compression amount or the elastic modulus of the over travel spring needs to be set to be large to have enough elastic force to resist the electric repulsion, and the compression amount or the elastic modulus of the over travel spring needs to be set to be large, which means that if the over travel spring needs to be further compressed, a larger external force is needed, so when the pyrotechnic excitation device 5 is excited, the over travel spring needs to be further compressed by a larger impact force to further push the movable contact spring 2 to descend, but the magnetic conductive ring assembly is arranged in the embodiment, and when the load loop current (or the fault current) is larger, the magnetic conductive ring assembly is mainly used to resist the electric repulsion by the magnetic force of the magnetic conductive ring assembly, the elastic force of the overtravel spring is less than the maximum electric repulsion force between the static contact 1 and the movable reed 2, so the elastic force (the contact pressure to the movable reed) of the overtravel spring can be set smaller, namely the overtravel spring with small elastic coefficient k value can be adopted, or the compression amount of the overtravel spring is smaller, so the overtravel spring is easier to be compressed, the required impact force generated by the pyrotechnic exciting device 5 is not needed to be very large, the explosive amount of the pyrotechnic exciting device 5 can be reduced, the safety performance is improved, and the contact holding force of the movable iron core 43 in the electromagnetic driving mechanism 4 can be correspondingly reduced because the contact pressure of the overtravel spring to the movable reed is small, the diameter of the movable iron core 43, the elastic force of the return spring 45, the suction force of the coil 42 and the like can be reduced during actual design, so the explosive amount required by the pyrotechnic exciting device is further reduced, the reliability of the pyrotechnic excitation device is improved; moreover, since the piston 52 impacts and crushes the restraint frame 400 downwards, the movable spring leaf 2 is restrained from rebounding and returning towards the static contact 1, and since the overtravel spring is more easily compressed, the piston 52 has greater energy to impact the restraint frame 400, so as to ensure that the restraint frame 400 deforms irreparably; in addition, once the short-circuit current exceeds the set monitoring current value of the monitoring excitation circuit, the attraction force of the lower magnetizer 446 to the upper magnetizer 447 is increased, because the magnetic attraction force of the lower magnetizer 446 to the upper magnetizer 447 is superimposed with the electric repulsion force, the magnetic attraction force of the stationary iron core 41 to the movable iron core 43 is not enough to support the movable iron core 43 and the push rod assembly 44, at this time, the movable iron core 43 falls off in advance, the push rod assembly 44 and the movable reed 2 descend, meanwhile, the pyrotechnic excitation device 5 is excited, the piston 52 impacts downwards on the U-shaped bracket 443 until the upper magnetizer 447 contacts with the movable reed 2, the upper magnetizer 447, the movable reed 2 and the lower magnetizer 446 form a whole, the mutual magnetic attraction force between the upper magnetizer 447 and the lower magnetizer 446 becomes an internal force until the movable reed 2 finally separates from the static contact 1, and the magnetic attraction force of the magnetic ring assembly for resisting the electric repulsion force disappears, in the process, the pushing force of the piston 52 is superposed with the downward acting force of the electric repulsive force to push the movable spring leaf 2 to move downwards further in an accelerated manner, so that the breaking of the contact is accelerated, the breaking time is shortened, and the electrical safety of the product is further improved.

The present embodiment describes the functions and effects of the pyrotechnic excitation device 5, the magnetic conductive ring assembly, and the push rod assembly 44 with a relay structure, and the same structure can be applied to other switching devices, such as a contactor, in addition to a relay.

Example 2:

referring to fig. 15, the present embodiment provides a relay, which has a structure similar to that of the relay of embodiment 1, except that only one set of magnetic ring assemblies is disposed on the movable contact spring 2A, and the one set of magnetic ring assemblies includes an upper magnetic conductor 447A and a lower magnetic conductor 446A. This embodiment is applicable to the relay that anti short-circuit ability is lower than embodiment 1, only adopts a set of magnetic conduction ring subassembly can simplify spare part quantity and structure, convenient production and equipment.

Example 3:

referring to fig. 16, the present embodiment provides a relay, which has a structure similar to that of the relay of embodiment 1, except that the movable contact spring 2B of the present embodiment is provided with three sets of magnetic conductive ring assemblies, and each set of magnetic conductive ring assembly includes an upper magnetic conductor 447B and a lower magnetic conductor 446B. This embodiment is applicable to the relay that anti short circuit ability is higher than embodiment 1, can improve the anti short circuit ability of relay through the magnetic attraction that improves the magnetic ring subassembly.

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 (11)

1. Switch electrical apparatus with fireworks formula excitation device, including switch electrical apparatus body and the fireworks formula excitation device of setting on the switch electrical apparatus body, the switch electrical apparatus body includes directly moving electromagnetic drive mechanism and moves the contact site with the executive switch function including the fixed static contact who sets up and movable, directly moving electromagnetic drive mechanism includes push rod assembly, it is in to move the contact site through the elastic component assembly in the push rod assembly to realize with static contact over travel contact, its characterized in that: still include a set of at least magnetic conduction ring subassembly, the magnetic conduction ring subassembly is including last magnetizer and lower magnetizer that sets up in opposite directions, it is in to go up magnetizer fixed connection push rod assembly's upper end, lower magnetizer fixed connection move on the contact site, pyrotechnic composition formula excitation device is including being used for carrying out the promotion medium of downstream, it is in to promote the medium correspondence the upper end of push rod assembly's position.

2. Switching appliance with pyrotechnic excitation device according to claim 1, characterized in that: the pushing medium is high-pressure fuel gas generated by ignition of the pyrotechnic excitation device, or the pushing medium is a piston.

3. Switching appliance with pyrotechnic excitation device according to claim 1, characterized in that: the magnetic conduction ring component is provided with n groups, wherein n is more than or equal to 2.

4. Switching appliance with pyrotechnic excitation device according to claim 1, characterized in that: the upper magnetizer is of a straight-line structure and is fixedly and transversely arranged above the movable contact part, the lower magnetizer is of a U-shaped structure, the lower magnetizer and the movable contact part are fixedly connected and semi-surround at least part of current-carrying conductors of the movable contact part, and the opening of the lower magnetizer of the U-shaped structure faces the upper magnetizer, so that the upper magnetizer and the lower magnetizer form a magnetic conduction loop.

5. Switching appliance with pyrotechnic excitation device according to claim 1, characterized in that: the push rod assembly comprises a restraint frame, the movable contact part penetrates through the restraint frame, the elastic part is fixedly installed inside the restraint frame, the movable contact part faces the upper end of the restraint frame and is abutted against the upper end of the restraint frame through elastic force of the elastic part, the upper magnetizer is fixedly connected to the inner side of the top end of the restraint frame and is arranged above the movable contact part, the restraint frame moves upwards to enable the movable contact part to be abutted against the static contact part, the restraint frame is driven by the linear movement electromagnetic driving mechanism to continue to move upwards to compress the elastic part, and a certain magnetic air gap exists between the upper magnetizer and the lower magnetizer.

6. Switching appliance with pyrotechnic excitation device according to claim 5, characterized in that: when the movable contact part and the static contact part are abutted, the elastic force of the elastic piece is smaller than the maximum electric repulsion force between the movable contact part and the static contact part.

7. Switching appliance with pyrotechnic excitation device according to claim 1, characterized in that: the pyrotechnic excitation device is of an independent modular structure, is fixedly installed on the switch appliance body from the outside of the switch appliance body and generates explosion impact force through ignition gunpowder, and the movable contact part is forced to be far away from the static contact part to enable the switch appliance to be quickly disconnected.

8. Switching appliance with pyrotechnic activation device according to claim 7, characterized in that: the switch electric appliance body comprises a ceramic cover, the ceramic cover at least surrounds the static contact part, the dynamic contact part and the mutual contact part to form a contact inner cavity, a jack is arranged on the ceramic cover, and one end of the pyrotechnic excitation device penetrates through the jack and extends into the contact inner cavity to be arranged on one side of the dynamic contact part in a facing mode.

9. Switching device with pyrotechnic excitation device according to claim 8, characterized in that: the pyrotechnic excitation device comprises an exciter, a bottom shell and a piston serving as the pushing medium, 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 penetrates through the insertion hole and extends into the contact inner cavity 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 that the movable contact part is pushed to be far away from the static contact part.

10. Switching device with pyrotechnic excitation device according to claim 9, 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 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.

11. Switching device with pyrotechnic excitation device according to claims 1 to 10, characterized in that: the switching device is a direct-current high-voltage relay.

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