Contactor integrated with excitation function

Abstract

The utility model relates to the field of circuit protection, in particular to a contactor integrated with an excitation function, and an excitation ignition assembly, a first piston, a first conductive part, an auxiliary contact system, a push rod, a melt, an air passage, a second piston and an elastic part are integrated in the contactor. The melt and the auxiliary contact system are connected in series and then are connected in series between the two static contacts. In a normal working state, the auxiliary contact system is insulated and disconnected, when an overload current, a short-circuit current or an abnormal condition occurs, the ignition assembly is excited to act to drive the first piston and the first conductive piece to move, the first conductive piece enables the auxiliary contact system to be conducted and closed, and the melt is connected into a main loop in a parallel connection mode; and then the second piston and the elastic piece are driven to displace through the air passage, so that the contact system is switched off, the elastic piece generates irreversible deformation, and the first piston and the first conductive piece push the push rod to disconnect the melt. According to the invention, the power loss is low, zero-current cut-off of a main loop can be realized, and the breaking capacity and the breaking reliability are improved.

Description

Technical Field

[0001] The invention relates to the field of circuit protection, in particular to a contactor, in particular to a contactor in which a fuse and an excitation function are integrated. Background Art

[0002] At present, the protection measures for DC circuit systems (especially wind power, photovoltaics, energy storage and electric vehicles, etc.) are fuses plus contactors. The contactor is mainly responsible for the connection and disconnection of rated load and below current, and the fuse is mainly responsible for protective disconnection under overload and short circuit conditions. Due to the uncertainty of the fuse's protection of low overload current, the matching between the two devices, the fuse and the contactor, makes it impossible to achieve full-range current protection. At the same time, it is impossible to provide a safe and reliable isolation break when dealing with special accident situations (such as electric vehicle collisions). In addition, due to the large resistance of the fuse itself, a large amount of heat will be generated during the application process, the power consumption is large, and the two devices are also complex and occupy a large space in matching and space use.

[0003] Chinese patent application 202210250275.5 discloses a fuse integrated contactor, in which an explosive pack, an igniter, and a piston are integrated. The igniter ignites the explosive pack to react chemically and release high-pressure gas as a driving force, driving the piston to move, forcing the moving contact and the static contact to be out of contact after closing. After the contactor is closed, the coil is always energized to provide the moving contact with a continuous magnetic field force toward the static contact to maintain the closed state. When the piston is driven by the driving force to force the moving and static contacts to be separated after closing, the magnetic field force provided by the coil must be overcome before the moving and static contacts can be separated from the conductive contact. The defects are: in the case of high current, forcing the moving contact to separate will generate a large arc between the moving and static contacts. The presence of a large arc may cause the circuit to be disconnected incompletely and unreliably, and at the same time cause ablation of the device, causing safety hazards. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a contactor with an integrated excitation function. When an overload, short-circuit current or abnormal situation occurs, a fuse is first introduced in parallel in the main circuit formed by the moving contact and the stationary contact, and then the moving contact and the stationary contact are separated from the conductive contact, and then the fuse is melted or cut off. Zero current disconnection between the moving contact and the stationary contact is achieved, a large arc is avoided between the moving contact and the stationary contact, and the breaking capacity and breaking safety performance are improved.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is a contactor with an integrated excitation function, comprising: a drive system, a contact system, the contact system comprising a moving contact and two sets of stationary contacts, the drive system comprising a movable moving guide rod, the moving contact being arranged on the moving guide rod and being displaceable relative to the moving guide rod under the action of an external force; under normal working conditions, the drive system drives the moving guide rod to displace, the moving guide rod displaces the moving contact, and realizes normal opening and closing of the contact system;

[0006] It also integrates an excitation ignition component, a first piston, a first conductive member, an auxiliary contact system, a melt, a push rod, a second piston, and an elastic member; the first conductive member is arranged on the impact end surface of the first piston;

[0007] The fuse is connected in series with the auxiliary contact system, and the two ends of the branch formed by the series connection of the fuse and the auxiliary contact system are connected in series between the two groups of static contacts. The auxiliary contact system includes a conductive first auxiliary contact and a second auxiliary contact; one end of the first auxiliary contact and the second auxiliary contact are arranged with an insulating interval and are located between the fuse and the first conductive member, and the first conductive member is arranged corresponding to one end of the first auxiliary contact and the second auxiliary contact arranged with an insulating interval from each other; in an initial state, the first conductive member is not in contact with at least one of the first auxiliary contact and the second auxiliary contact; the push rod is located on the displacement path of the first conductive member, and the push rod is arranged corresponding to the fuse;

[0008] The elastic member is opposite to the moving contact and is arranged between the two stationary contacts. The elastic member is a tubular structure with one end open and the other end closed. The open end of the elastic member is sealed and fixedly arranged, and the closed end thereof is arranged in a free state toward the moving contact. The second piston is arranged in the elastic member, and one end of the second piston facing the open end of the elastic member is connected with the chamber between the excitation ignition component and the first piston through an air channel. The opening of the air channel for connecting the air channel with the chamber between the excitation ignition component and the first piston is located on the displacement path of the first piston. When the first piston is in the initial position, the first piston blocks the opening of the air channel, and the air channel and the internal space of the elastic member form a closed chamber.

[0009] The excitation ignition component can be activated according to the received trigger signal to release a driving force capable of driving the first piston and the second piston to move;

[0010] When the moving contact and the static contact are closed to form a main circuit, when an overload current, a short circuit current or an abnormal situation occurs, the excitation ignition component releases the driving force according to the received trigger signal, drives the first piston to drive the first conductive member to move, and makes the first auxiliary contact and the second auxiliary contact conductively contact through the first conductive member, so that the melt is connected to the main circuit in parallel; when the first piston continues to move, the air channel is connected to the chamber between the excitation ignition component and the first piston, and the driving force drives the second piston to move through the air channel, and the second piston drives the elastic member to produce irreversible deformation, and the elastic member in the irreversible deformation process drives the moving guide rod to move, so that the moving contact and the static contact are separated, and then the first piston drives the first conductive member to drive the push rod to move to disconnect the melt.

[0011] Preferably, the moving contact and one end of the static contact in conductive contact with the moving contact are located in a sealed chamber, and the sealed chamber is filled with a gas arc extinguishing medium; a guide structure with two ends through is opened on the top of the sealed chamber, and the elastic member is arranged in the guide structure, and its open end is fixedly arranged at one end of the guide structure, and the closed end is located in the guide structure; the air channel includes a first part and a second part which are interconnected; the first part of the air channel is arranged outside the sealed chamber and is connected to the chamber between the first piston and the excitation ignition component; the second part of the air channel is inserted into the elastic member located in the guide structure from the outside of the sealed chamber and the open end of the elastic member; the second piston is arranged in the second part of the air channel located in the elastic member in an interference fit manner; the driving force released by the excitation ignition component can drive the second piston to displace relative to the second part of the air channel through the air channel, and drive the closed end of the elastic member to displace, thereby generating irreversible deformation.

[0012] Preferably, the elastic member is a bellows, and on the outer peripheral surface of the second part of the air duct, a plurality of limiting sealing rings are arranged at intervals corresponding to the wave crest positions of the bellows, and the end faces of the limiting sealing rings are concave structures. The concave structure of the limiting sealing rings abuts against the wave crests of the bellows, thereby pressing the bellows at the outer peripheral surface of the second part of the air duct; the closed end of the bellows is located on the outside of the second part of the air duct.

[0013] Preferably, one end of the first auxiliary contact is conductively connected to a stationary contact, and one end of the second auxiliary contact is conductively connected to one end of the melt, or one end of the second auxiliary contact is conductively connected to a stationary contact, and one end of the first auxiliary contact is conductively connected to one end of the melt; the other end of the melt is conductively connected to another stationary contact; the first auxiliary contact and the second auxiliary contact are relatively insulated or staggered; when relatively insulated, the push rod is located between one end of the first auxiliary contact and the second auxiliary contact that are relatively insulated; the first piston drives the first conductive member to insert between the relative ends of the first auxiliary contact and the second auxiliary contact, and after the first conductive member makes the first auxiliary contact and the second auxiliary contact conductively contact, the first conductive member pushes the push rod to displace; when staggered, the push rod is located on the displacement path of the first auxiliary contact, and after the first piston drives the first conductive member to drive the first auxiliary contact to displace and conductively contact the second auxiliary contact, the first conductive member pushes the push rod to displace.

[0014] Preferably, when the first auxiliary contact and the second auxiliary contact are arranged in a staggered and insulated manner, the first auxiliary contact and the second auxiliary contact are in conductive contact in a flat plate manner, in conductive contact by interference insertion, or in conductive contact by stamping deformation insertion.

[0015] Preferably, when conductive contact is made in a flat plate manner, the first auxiliary contact and the second auxiliary contact are both flat plate structures, and when conductive contact is made, two opposing surfaces of the first auxiliary contact and the second auxiliary contact are in conductive contact;

[0016] When the first conductive member is in contact by interference insertion, the first conductive member replaces the first auxiliary contact, the first conductive member is conductively connected to the static contact through a flexible connection, and the second auxiliary contact is provided with a hollow structure or a hollow structure at the position corresponding to the first conductive member. When the first piston drives the first conductive member to displace, the first conductive member is inserted into the hollow structure of the second auxiliary contact, or penetrates and is inserted into the hollow structure of the second auxiliary contact, so that the second auxiliary contact is conductively contacted by interference insertion;

[0017] When the first auxiliary contact is made in a conductive manner by means of stamping, deformation and insertion, the first auxiliary contact is a flat plate structure, and the second auxiliary contact is a groove structure. When the first piston drives the first conductive part to displace, the first conductive part causes the first auxiliary contact to be stamped, deformed and inserted into the groove structure of the second auxiliary contact for conductive contact.

[0018] Preferably, a spike structure is provided on the outer peripheral surface of the first conductive member.

[0019] Preferably, one side of the contact system and the drive system is also provided with a butt-jointed sleeve and a melt shell, and a sealing cover plate is provided between the sleeve and the melt shell; the excitation ignition assembly, the first piston, and the first conductive member are respectively arranged in the sleeve in sequence, and an opening connected to the air passage is opened on the sleeve; the push rod is connected to the sealing cover plate by a mechanically disconnecting weak structure, and the auxiliary contact system is arranged on the sealing cover plate, and the sealing cover plate and the melt shell form an arc extinguishing chamber, and the melt is penetrated in the melt shell; when the first piston drives the first conductive member to displace, the first conductive member first makes the first auxiliary contact and the second auxiliary contact conductively contact, and pushes the push rod to separate from the sealing cover plate and then disconnect the melt.

[0020] Preferably, the sealing cover plate is located on two surfaces of the sleeve and the melt shell and is respectively provided with a first protrusion and a second protrusion relative to each other, the first protrusion and the second protrusion have a through hollow portion, and the push rod is integrally formed in the hollow portion through the mechanical disconnection weakening structure; a partition-like structure is provided in the melt shell corresponding to the second protrusion, a displacement channel is provided on the partition-like structure, the second protrusion is butted against the end face of the partition-like structure, so that the arc extinguishing medium is isolated from the hollow portion of the second protrusion and the displacement channel of the partition-like structure; the melt passes through the arc extinguishing medium and the end face where the second protrusion and the partition-like structure are butted against each other; when the push rod disconnects the melt, the push rod enters the displacement channel of the partition-like structure.

[0021] Preferably, an internal trigger circuit, a micro switch, and a magnetic tripping device are also integrated, and the internal trigger circuit is connected in parallel with the coil power-on circuit; the micro switch includes two groups of normally closed and normally open contacts; in one group of normally closed and normally open contacts, the normally open contact is connected in series in the internal trigger circuit, the normally closed contact is connected in series in the coil power-on circuit, and the other group of normally closed and normally open contacts can be connected in series in the alarm circuit; the magnetic tripping device includes a moving magnet and a static magnet, and the static magnet is arranged around one group of static and stationary contacts, and the moving magnet is arranged corresponding to the static magnet, and when the current in the main circuit formed by the conductive contact between the moving contact and the static contact exceeds a threshold value, the moving magnet is located in the static magnet. In the magnetic field loop generated by the main body, one end of the static magnet is rotatably arranged, and the other end is fixed by a spring support, and an air gap is retained between the dynamic magnet and the static magnet; the dynamic magnet is mechanically linked with the lever of the micro switch; when the current of the main circuit exceeds the threshold, the static magnet generates an adsorption force to adsorb and fix the dynamic magnet on the static magnet. During the adsorption process, the dynamic magnet drives the micro switch to operate, the normally open contact closes, and the normally closed contact opens, then the coil power circuit is de-energized, and the internal trigger circuit is turned on to send a trigger signal to the excitation ignition component. At the same time, the alarm circuit state changes and an alarm signal is sent.

[0022] Preferably, the driving system is connected to the moving contact through a moving guide rod, and a limit block is arranged on the outer periphery of the moving guide rod to limit the position of the moving contact when it is normally open; when the moving contact is driven by the elastic member and the second piston, the limit block on the moving guide rod is disconnected, and the moving contact is opened under the drive of the elastic member and the second piston.

[0023] The beneficial effects are:

[0024] When the contactor is in normal working condition, since the fuse is not connected to the main circuit, the temperature rise and power loss caused by the fuse are zero. Therefore, under normal working condition, the power loss and heat generation of the contactor with integrated excitation function are reduced;

[0025] By connecting the parallel fuse in case of overload, short circuit or abnormal situation, the moving and static contacts form a main circuit to achieve zero current cutoff, avoiding high current arc when the moving and static contacts are disconnected, and avoiding possible ablation and damage to the moving and static contacts.

[0026] By providing the elastic member, when the second piston drives the elastic member to open the moving contact and the static contact, the moving contact cannot rebound due to the irreversible deformation of the elastic member, thereby ensuring the disconnection reliability.

[0027] Since the air duct and the elastic part are separate parts, when the second piston is driven, the impact generated by the driving force is wrapped in the air duct and the elastic part, and the impact on other parts is relatively small, and the mechanical strength requirements of the airtight sealing shell and the partition are not high.

[0028] The excitation ignition assembly and the first piston are arranged in the sleeve, and the sleeve bears the impact force brought by the driving force released by the excitation ignition assembly, thereby reducing the impact of the shell 10. Therefore, the material requirements of the shell 10 can be relatively reduced, making the range of selectable materials for the shell 10 wider.

[0029] By setting the fuse in the arc extinguishing medium and filling the sealed chamber where the contact system is located with inert arc extinguishing gas, the arc generated when the moving and static contacts are normally opened can be extinguished with the help of inert gas. In the event of overload, short circuit and abnormality, the main circuit can be zero-cut off through the parallel fuse, and the arc can be extinguished in the arc extinguishing medium where the fuse is located, thereby improving the breaking capacity and breaking reliability.

[0030] By setting up a magnetic tripping device and an internal trigger circuit, active and passive protection is achieved, ensuring that the excitation ignition component can receive the trigger signal and operate, thereby improving the working reliability of the integrated contactor.

[0031] The integrated contactor of the present invention has a more compact structure, a smaller volume, and is safer and more reliable in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the appearance structure of Example 1.

[0033] Figure 2 yes Figure 1 Schematic diagram of the structure from a perspective perpendicular to the line connecting the two static contacts.

[0034] Figure 3 yes Figure 2 AA section view.

[0035] Figure 4 yes Figure 3 BB cross-sectional view.

[0036] Figure 5 yes Figure 3 CC cross-sectional view.

[0037] Figure 6 yes Figure 3 A partial enlarged schematic diagram of .

[0038] Figure 7 It is a schematic diagram of the appearance structure provided with a magnetic tripping device.

[0039] Figure 8 It is a schematic diagram of a structure in which a magnetic release device is provided after the outer shell is removed.

[0040] Fig. 9 It is a schematic diagram of the circuit principle of a magnetic tripping device.

[0041] Reference numerals:

[0042] Shell 10, partition 101, airtight sealed shell 102, guide cylinder 103, top chamber 11, bottom chamber 12, static contact 14, moving contact 15, drive coil 16, magnetic ring 161, moving iron core 17, static iron core 18, moving guide rod 19, moving contact spring 20, excitation ignition assembly 21, first piston 22, first conductive member 23, melt 24, airway 25, first part 251,

[0043] The second part 252, the second piston 26, the elastic member 27, the sleeve 28, the melt shell 29, the arc extinguishing chamber 291,

[0044] Sealing cover 30, first auxiliary contact 31, second auxiliary contact 32, first protrusion 33, second protrusion 34, push rod 35, partition structure 36, external trigger circuit 45, coil power circuit 38, internal trigger circuit 39,

[0045] Alarm circuit 40, micro switch 41, normally open contact A1, normally closed contact A2, normally open contact B1, normally closed contact B2,

[0046] Static magnet 42 , dynamic magnet 43 , and spring 44 . DETAILED DESCRIPTION

[0047] The contactor with integrated excitation function of the present invention comprises: a driving system and a contact system, wherein the contact system comprises a moving contact and two groups of stationary contacts, and the driving system comprises a movable moving guide rod, wherein the moving contact is arranged on the moving guide rod and can be displaced relative to the moving guide rod under the action of an external force; under normal working conditions, the driving system drives the moving guide rod to displace, and the moving guide rod moves the moving contact with it, thereby realizing normal opening and closing of the contact system;

[0048] It also integrates an excitation ignition component, a first piston, a first conductive member, an auxiliary contact system, a melt, a push rod, a second piston, and an elastic member; the first conductive member is arranged on the impact end surface of the first piston;

[0049] The fuse is connected in series with the auxiliary contact system, and the two ends of the branch formed by the series connection of the fuse and the auxiliary contact system are connected in series between the two groups of static contacts. The auxiliary contact system includes a conductive first auxiliary contact and a second auxiliary contact; one end of the first auxiliary contact and the second auxiliary contact are arranged with an insulating interval and are located between the fuse and the first conductive member, and the first conductive member is arranged corresponding to one end of the first auxiliary contact and the second auxiliary contact arranged with an insulating interval from each other; in an initial state, the first conductive member is not in contact with at least one of the first auxiliary contact and the second auxiliary contact; the push rod is located on the displacement path of the first conductive member, and the push rod is arranged corresponding to the fuse;

[0050] The elastic member is directly opposite to the moving contact and is arranged between the two stationary contacts. The elastic member is a tubular structure with one end open and the other end closed. The open end of the elastic member is sealed and fixedly arranged, and the closed end thereof is arranged in a free state toward the moving contact. The second piston is arranged in the elastic member, and one end of the second piston facing the open end of the elastic member is connected with the chamber between the excitation ignition component and the first piston through an air channel. The opening of the air channel for connecting the air channel with the chamber between the excitation ignition component and the first piston is located on the displacement path of the first piston. When the first piston is in the initial position, the first piston blocks the opening of the air channel, and the air channel and the internal space of the elastic member form a closed chamber.

[0051] The excitation ignition component can be actuated according to the received trigger signal to release a driving force capable of driving the first piston and the second piston to move;

[0052] When the moving contact and the static contact are closed to form a main circuit, when an overload current, a short circuit current or an abnormal situation occurs, the excitation ignition component releases the driving force according to the received trigger signal, drives the first piston to drive the first conductive part to move, and makes the first auxiliary contact and the second auxiliary contact conductively contact through the first conductive part, so that the melt is connected to the main circuit in parallel; during the continued displacement of the first piston, the air channel is connected to the chamber between the excitation ignition component and the first piston, and the driving force drives the second piston to move through the air channel, and the second piston drives the elastic part to produce irreversible deformation, and the elastic part in the irreversible deformation process drives the moving guide rod to move, so that after the moving contact and the static contact are opened, the first piston drives the first conductive part to drive the push rod to move to disconnect the melt.

[0053] With respect to the above technical solution, preferred embodiments are now given for specific description.

[0054] Example 1

[0055] See also Figures 1 to 7The integrated contactor of the present invention comprises a housing 10, in which the housing 10 is mainly divided into three mutually insulated chambers, a top chamber 11, a bottom chamber 12 and a side chamber. The top chamber 11 is located above the bottom chamber 12, and the side chamber is located on the sides of the top chamber 11 and the bottom chamber 12. The top chamber 11 is a sealed chamber, and is filled with arc extinguishing gas, such as an inert gas, such as nitrogen and hydrogen.

[0056] The integrated contactor of the present invention mainly includes a contact system, a drive system, an excitation arc extinguishing component, and a forced opening component. The contact system and the forced opening component are arranged in the top chamber 11, the drive system is arranged in the bottom chamber 12, and the excitation arc extinguishing component is arranged in the side chamber.

[0057] The contact system includes a static contact 14, a moving contact 15, and a moving contact spring 20, and there are two static contacts 14. The driving system mainly includes a driving coil 16, a moving iron core 17, a static iron core 18, a moving guide rod 19, and a magnetic ring 161. The excitation arc extinguishing component mainly includes an excitation ignition component 21, a first piston 22, a first conductive member 23, an auxiliary contact system, a sealing cover plate 23, and a melt 24. The components that drive the moving contact to force the gate to open include: an air duct 25, a second piston 26, and an elastic member 27. The second piston 26 and the elastic member 27 are made of insulating materials.

[0058] The top chamber 11 is insulated and separated from the bottom chamber 12 by a partition 101. In the top chamber 11, an airtight sealed shell 102 is provided. The airtight sealed shell 102 is pressed and arranged on the partition 101 by the shell 10. A sealed cavity is formed between the airtight sealed shell 102 and the partition 101. The sealed cavity is filled with arc extinguishing gas, such as an inert gas, such as nitrogen. Two mounting holes for the installation of the static contact 14 are provided at intervals on the top of the airtight sealed shell 102. A limiting step is provided on the static contact 14. When the static contact 14 is installed in the mounting hole of the airtight sealed shell 102, the limiting step of the static contact 14 is clamped outside the mounting hole of the airtight sealed shell 102 to limit the static contact 14. A sealing ring is provided between the contact surface between the static contact 14 and the airtight sealed shell 102 to seal the contact surface. One end of the static contact 14 is located in the airtight sealed housing 102, and the other end passes through the housing 10 and is located outside the housing 10 to facilitate connection with an external circuit. The moving contact 15 is located in the airtight sealed housing 102, and is arranged opposite to the two sets of static contacts 14. When the switch is opened, the moving contact 15 maintains an insulation distance with the static contacts 14. When the switch is closed, the moving contact 15 moves to make conductive contact with the two static contacts 14, so that a main circuit connected in series is formed between the two static contacts 14 and the moving contact 15.

[0059] A guide cylinder 103 penetrating the airtight sealed housing 102 is arranged at the top of the airtight sealed housing 102 between the two static contacts 14, and one end of the guide cylinder 103 extends into the airtight sealed housing 102, so that the guide cylinder 103 has a certain length. The guide cylinder 103 is integrally formed with the airtight sealed housing 102, and a limiting step is provided at one end of the guide cylinder 103 located outside the airtight sealed housing 102. The elastic member 27 is a bellows structure, one end of which is closed and the other end is open. Its open end is folded outward to form a limiting edge. The elastic member 27 is inserted into the guide cylinder 103 and is arranged in contact with the inner wall of the guide cylinder. The limiting edge of the open end of the elastic member 27 is arranged at the limiting step of the guide cylinder 103, and the limiting edge of the open end of the elastic member 27 is sealed and connected and fixed with the limiting step of the guide cylinder 103 to prevent gas from leaking from the gap between the open end of the elastic member and the guide cylinder. The closed end of the elastic member 27 is located at one end of the guide cylinder 103 close to the moving contact 15, and is arranged directly opposite to the moving contact 15. The closed end of the elastic member 27 serves as a free end and can be telescopic relative to the fixed end.

[0060] The air duct 25 is a separately manufactured part, which is in an inverted L-shape as a whole and is a bent tubular structure with two ends open. The air duct 25 includes a first part 251 and a second part 252 which are connected in an integral manner. The second part is vertically connected to one end of the first part to form an inverted L-shaped structure. The second part is kept at a certain distance from the end of the first part connected thereto, so that after the second part of the air duct is inserted into the guide cylinder 103, the end of the first part close to the second part can be carried on one side of the guide cylinder 103 for support. A long groove connected to the guide cylinder 103 is provided on the top outer surface of the airtight sealed housing 102. The first part of the air duct 25 is arranged in the long groove on the top outer surface of the airtight sealed housing 102 to limit the air duct 25. The contact surface between the first part of the air duct 25 and the long groove on the top outer surface of the airtight sealed housing 102 is in plane contact to ensure that the air duct 25 is placed stably. The open end of the first part of the air duct 25 can be communicated with the side chamber 13, and the second part of the air duct 25 extends from the outside of the airtight sealing housing 102 into the elastic member 27 in the guide cylinder 103, compressing the elastic member 27 and fixing the elastic member 27 in the guide cylinder 103. On the outer periphery of the second part of the air duct 25, a plurality of limiting sealing rings are arranged at intervals corresponding to the wave crest positions of the elastic member 27, and the end surface of the limiting sealing ring is a concave structure, which can just abut against the wave crest of the bellows, compress the bellows, and seal the contact surface between the air duct and the bellows. The air duct 25 is pressed and fixed on the airtight sealing housing 102 through the housing 10.

[0061] The second piston 26 is arranged in the second part of the air passage 25 in the guide cylinder 103 in an interference fit manner, and a space for gas circulation is reserved between the top of the second piston 26 and the first part of the air passage. The end of the second piston 26 close to the moving contact is the impact end. When the second piston 16 is impacted, it can move relative to the second part of the air passage 25 and the guide cylinder, pushing the closed end of the elastic member to move, thereby driving the moving contact and the static contact to open.

[0062] A coil frame is provided in the housing 10 below the partition 101, and a driving coil 16 is sleeved on the coil frame. The moving guide rod 19 is fixedly provided on the moving iron core 17, and the static iron core 18 is located above the moving iron core 17. A displacement space is reserved between the static iron core and the moving iron core. When the switch is closed, the static iron core 18 can adsorb the moving iron core 17 thereon. A magnetic conductive ring 161 is provided on the outer periphery of the moving iron core 17, the static iron core 18, and the driving coil 16. The partition 101 is located above the magnetic conductive ring 101, and both ends of the partition 101 are supported on the coil frame. The upper end of the moving guide rod 19 passes through the static iron core 18, the magnetic ring 161 and the partition 101 and is located in the airtight sealed housing 102. A limit ring rib is arranged on the outer periphery of the moving guide rod 19 in the airtight sealed housing 102, and a limit plate is arranged on the upper end of the moving guide rod 19. The moving contact 15 is arranged on the moving guide rod 19 between the limit ring rib and the limit plate. A moving contact spring 20 is sleeved between the moving contact 15 and the limit ring rib to support the moving contact 15. The moving contact spring 20 is always in a compressed state. Under the action of external force, the moving contact 15 can be displaced relative to the moving guide rod 19. When the moving contact and the static contact are in conductive contact, the moving contact spring 20 buffers the impact force during contact. The inner diameter of the through hole on the partition through which the moving guide rod 19 passes is larger than the outer diameter of the moving guide rod and smaller than the outer diameter of the limit ring rib. In the normal opening position, the limit ring rib on the moving guide rod 19 is located above the through hole on the partition. The through hole on the partition is sealed by a magnetic conductive ring located under the partition.

[0063] On the same side of the partition 101, the airtight sealed shell 102, and the coil skeleton, a butt-jointed sleeve 28 and a melt shell 29 are provided, and a sealing plate 30 is provided between the sleeve 28 and the melt shell 29. The sealing plate 30 is used to seal the melt shell 29 so that a sealed arc extinguishing chamber 291 is formed inside the melt shell 29. The arc extinguishing chamber 291 is filled with an arc extinguishing medium, such as quartz sand. The space inside the shell occupied by the butt-jointed sleeve 28 and the melt shell 29 is a side chamber. An excitation arc extinguishing assembly is provided in the butt-jointed sleeve and the melt shell.

[0064] An excitation ignition assembly 21 , a first piston 22 , a first conductive member 23 , and an auxiliary contact system are arranged in the sleeve 28 from top to bottom, and the melt 24 is inserted into the melt housing 29 .

[0065] The excitation ignition assembly 21 is arranged at the top of the sleeve 28. The excitation ignition assembly 21 is a gas generating device that can be activated according to the received trigger signal and release high-pressure gas as a driving force. The signal receiving end of the excitation ignition assembly 21 is located outside the sleeve 28, which can be connected to the trigger signal sending circuit outside the housing 10, and the driving force release end is located inside the sleeve 28. The excitation ignition assembly 21 is fixed by the sleeve 28 and the housing 10.

[0066] The first piston 22 is located in the sleeve 28 below the end where the driving force of the excitation ignition component 21 is released, and the first piston 22 is interference fit with the sleeve 28. The longitudinal section of the first piston 22 is H-shaped, and grooves are respectively provided on its upper and lower end faces. The end where the driving force of the excitation ignition component 21 is released is nested in the groove of the end face adjacent to the excitation ignition component 21, and the first conductive member 23 is nested and fixedly provided at the end of the first piston 22 close to the sealing plate 30, and the first conductive member 23 is a columnar structure. An opening is provided at the position of the sleeve 28 relative to the airway 25, and the open end of the first part of the airway 25 is penetrated at the opening of the sleeve 28. When the first piston is in the initial position, the first piston blocks the opening on the sleeve 28.

[0067] The auxiliary contact system includes a first auxiliary contact 31 and a second auxiliary contact 32. The melt 24 is arranged in the melt shell 29, and its two ends are located outside the melt shell 29. The melt 24 is connected in series with the auxiliary contact system. In this embodiment, the melt 24 is connected in series with the auxiliary contact system as follows: one end of the melt 24 is conductively connected to one end of the second auxiliary contact 32, and the other end of the melt 24 is conductively connected to one of the static contacts 14. One end of the first auxiliary contact 31 is conductively connected to another static contact 14, and the other end of the first auxiliary contact 31 is relatively insulated from the other end of the second auxiliary contact 32. When the first piston is displaced, the first conductive member 23 on the first piston enters between the two ends of the first auxiliary contact 31 and the second auxiliary contact 32 that are adjacent and oppositely arranged, and respectively conductively contacts the first auxiliary contact 31 and the second auxiliary contact 32, and connects the melt 24 in parallel to the main circuit formed after the static contact and the moving contact are closed.

[0068] The sealing cover plate 30 is arranged on the melt shell 29 and is used to seal the melt shell 29. The sealing cover plate 30 is respectively provided with a first protrusion 33 and a second protrusion 34 on the upper and lower surfaces corresponding to the conductive part position of the first piston, and a through hollow part is opened in the first protrusion 33 and the second protrusion 34. A push rod 35 is arranged in the hollow part through which the first protrusion 33 and the second protrusion 34 are connected, and the push rod 35 is connected to the sealing cover plate by mechanically disconnecting the weak structure. The push rod 35 is arranged corresponding to the conductive part 23 on the first piston 22, and the upper end of the push rod 33 protrudes from the first protrusion 33. The sealing cover plate 30, the first protrusion 33, the second protrusion 34 and the push rod 35 are all made of insulating materials.

[0069] The first auxiliary contact 31 and the second auxiliary contact 32 are arranged on the sealing cover plate 30. The two ends of the first auxiliary contact 31 and the second auxiliary contact 32 that are relatively insulated are bent respectively and inserted from the opposite sides of the first protrusion 33 of the sealing cover plate 30 into the groove formed between the inner wall of the first protrusion 33 and the push rod 35, and are opened in a trumpet shape.

[0070] A partition-like structure 36 is provided in the accommodation cavity of the melt shell 29 corresponding to the second protrusion 34 of the sealing cover plate 30. The height of the partition-like structure 36 is lower than the height of the melt shell 29, and a displacement channel for the push rod 35 to enter is provided on the partition-like structure 36. The second protrusion 34 of the sealing cover plate 30 is arranged on the partition-like structure 36, and a limited step is provided at the open end of the second protrusion 34 of the sealing cover plate 30. The upper end surface of the partition-like structure 36 abuts against the limited step of the second protrusion 34 to support the second protrusion 34, and the push rod 35 faces the displacement channel of the partition-like structure 36. The sealed accommodation cavity formed by the sealing cover plate 30, the melt shell 29, the second protrusion 34 and the partition-like structure 36 is filled with arc extinguishing medium. The second protrusion 34 and the partition-like structure 36 separate the push rod and the displacement channel from the arc extinguishing medium. The melt passing through the melt housing 29 passes through the second protrusion 34 and the interface of the partition-shaped structure 36 at the same time, and the melt 24 is located on the displacement path of the push rod 35 .

[0071] The first protrusion 33 on the sealing cover plate 30 is located in the sleeve 28 , and provides support for the sleeve 28 while defining the position of the sleeve 28 .

[0072] In the above embodiment, the auxiliary contact system is made of conductive material, and the sealing cover plate, the first piston, the second piston, and the push rod are all made of insulating material.

[0073] The working principle of this embodiment:

[0074] Under normal working conditions, the ignition assembly, the first piston and the second piston are not activated, the drive system and the contact system work normally, and the contactor can be opened and closed normally.

[0075] When there is an overload or short circuit current or an abnormal situation, the excitation ignition component 21 receives a trigger signal, ignites and releases high-pressure gas as a driving force, drives the first piston 22 to drive the first conductive member 23 to move together, and the first conductive member 23 pushes the push rod 35 at the sealing cover plate 30, driving the push rod 35 to disconnect from the sealing cover plate 30 at the mechanical disconnection weak point. At the same time, the first conductive member 23 is inserted between the adjacent two ends of the first auxiliary contact and the second auxiliary contact, and is in conductive contact with both ends of the first auxiliary contact and the second auxiliary contact, and the melt 24 is connected in parallel to the main circuit formed by the conductive contact of the static contact and the moving contact; in the process of the melt 24 being connected to the main circuit, it is in contact with the air channel 2 The opening of the sleeve connected to the first piston 5 is connected to the chamber between the first piston and the excitation ignition component after displacement. The high-pressure gas released by the excitation ignition component enters the second piston through the air passage 25, driving the second piston to displace. The second piston drives the elastic member to produce irreversible deformation toward the moving guide rod, that is, the second piston drives the closed end of the elastic member to displace toward the moving guide rod, so that the deformation amount of the elastic member exceeds the maximum elastic deformation amount to form an irreversible deformation. During the irreversible deformation process, the elastic member pushes the moving guide rod to drive the moving contact to displace, so that the moving contact and the static contact are disconnected. Under the impact of the second piston, the elastic member undergoes irreversible deformation, pressing the moving guide rod to prevent the moving contact from rebounding. When the moving contact and the static contact are out of conductive contact, the first piston and the first conductive member continue to displace, pushing the push rod to displace, cutting off the melt 24, and realizing zero current disconnection of the main circuit.

[0076] Due to the existence of the limiting ring rib on the moving guide rod, when the displacement of the moving guide rod drives the displacement of the moving contact to achieve opening, the position of the moving contact after opening is the normal opening position.

[0077] Arc extinguishing principle:

[0078] Under normal working conditions, current flows through the main circuit formed by the static contact and the moving contact connected in series. Since the auxiliary contact system is in an insulated disconnected state, the fuse 24 is not connected to the main circuit, and no current flows through the fuse 24. The fuse 24 will not produce any temperature rise or power loss.

[0079] When there is an overload or short circuit current, or an abnormal situation, the fuse 24 is first connected to the main circuit in parallel. Since the resistance of the fuse 24 is much larger than the resistance of the main circuit, the current flowing through the fuse 24 is very small and can be ignored. As the second piston causes the moving contact and the stationary contact to break away from the conductive contact, the resistance of the main circuit is instantly very large, and the current flows through the fuse 24. After the moving contact and the stationary contact are separated from the conductive contact, almost no arc is generated at the fracture formed between the moving and stationary contacts, or the generated arc is very small. The arc generated when the moving contact and the stationary contact are separated from the conductive contact is extinguished by the gas arc extinguishing medium filled in the top chamber; the current flows through the fuse, and due to the large resistance of the fuse, a current limit is formed, and the current flowing through the fuse 24 is reduced exponentially. As the first piston continues to move, the push rod part 33 is pushed to disconnect the fuse 24. Since the disconnected part of the fuse 24 is located in the arc extinguishing medium and the current is reduced exponentially, the arc generated at the fracture formed in the fuse 24 is relatively small, and the arc can be quickly extinguished by the arc extinguishing medium.

[0080] When there is an overload or short-circuit current, when the overload or short-circuit current is very large, the fuse 24 may melt immediately after the moving contact and the static contact are out of conductive contact. Since the narrow neck on the fuse is located in the arc extinguishing medium, the melted part of the fuse is located in the arc extinguishing medium. The arc generated by the melt melting is extinguished by the arc extinguishing medium, and then the first piston drives the push rod part to disconnect the fuse.

[0081] When there is an abnormal situation, the melt can only be disconnected by the first piston driving the push rod.

[0082] In the above embodiments, no matter the contactor is normally opened or closed or the movable contact is forced to move by deformation of the elastic member to open, the opening position of the movable contact is at the normal opening position. However, in some embodiments, when the driving force on the movable guide rod is large during opening, when the limit ring rib on the movable guide rod 19 moves to the partition, under the action of the impact force, the part of the limit ring rib in contact with the partition will break, releasing the limit, so that the limit ring rib of the movable guide rod enters the through hole of the partition, forming an insulation distance between the movable contact and the static contact greater than that during normal opening, forming a large-break opening.

[0083] Example 2

[0084] On the basis of Embodiment 1, a limit block is provided on the outer periphery of the moving guide rod 19, and the limit block is located below the limit ring rib. When the moving contact is in a normal opening position, the limit block of the moving guide rod 19 presses against the partition plate.

[0085] When overload, short circuit or abnormal situation occurs, the second piston drives the elastic member to move, thereby driving the moving contact and the static contact to conduct and separate. First, the moving contact is driven to move to the normal opening position. Under the continued displacement of the second piston and the elastic member, the limit block on the moving guide rod 19 is disconnected, driving the moving contact to the opening position, and the elastic member is irreversibly deformed. By adding a limit block to the moving guide rod for limiting, it can be prevented that after the outer periphery of the limit ring rib is broken, the moving contact spring is prevented from escaping from the limit ring rib, causing the moving contact to lose support, thereby improving the installation stability of the moving contact.

[0086] Example 3

[0087] In the first embodiment, the trigger signal received by the excitation ignition component 21 is an external trigger signal, and the external trigger circuit 45 is connected to the signal terminal of the excitation ignition component 21 to send the trigger signal to it. The drive coil 16 is powered on and off by the coil power circuit 38. Figures 7 to 9 On the basis of Example 1, an internal integrated internal trigger circuit 39 and an alarm circuit 40 are added, and the internal trigger circuit 39 is integrated in the contactor. The internal trigger circuit 39 is connected in parallel with the coil power circuit 38 and connected to the signal end of the excitation ignition component 21 to provide it with a trigger signal sent from the inside of the contactor, and the trigger signal sent by the external trigger circuit 45 is backed up to ensure that the excitation ignition component 21 can receive the trigger signal.

[0088] The micro switch 41 is arranged on the outer surface of the sleeve 28 and includes two groups of normally closed and normally open contacts. One group of normally open and normally closed contacts (A1, A2) is connected to the coil power circuit 38 and the internal trigger circuit 39 to control the switching between the coil power circuit 38 and the internal trigger circuit 39. The normally open contact A1 is connected in series to the internal trigger circuit 39, the normally closed contact A2 is connected in series to the coil power circuit 38, and the other group of normally closed and normally open contacts (B1, B2) is connected in series to the alarm circuit 40.

[0089] The magnetic tripping device includes a static magnet 42 and a dynamic magnet 43. The static magnet 42 is arranged in an annular structure around the terminal of one of the static contacts located outside the airtight sealed housing 102. The dynamic magnet 43 is arranged on one side of the open end of the static magnet 42. The dynamic magnet 43 is arranged in the magnetic field loop generated by the static magnet 42 when the static contact is energized. The dynamic magnet 43 is an armature, and one end of the dynamic magnet 43 is rotatably arranged on the outside of the sleeve 28 and supported on the outside of the sleeve 28 by a spring 44. The armature is mechanically linked to the lever of the micro switch 41. In the initial position, an air gap is arranged between the static magnet 42 and the dynamic magnet 43 to allow the dynamic magnet 43 to move.

[0090] The magnetic tripping device and the micro switch are both located in the housing 10 .

[0091] When the current of the main circuit formed by the moving contact and the static contact after closing exceeds the threshold value, the adsorption force generated by the static magnet 42 adsorbs the moving magnet 43, and drives the moving magnet 43 to move toward the static magnet 42. During the displacement of the moving magnet 43, the microswitch 41 is linked, and the normally open contact A1 connected in series in the internal trigger circuit 39 is closed, turning on the internal trigger circuit 39, and sending an internal trigger signal to the excitation ignition component 21; the normally closed contact A2 connected in series in the coil power-on circuit 38 becomes normally open, disconnecting the coil power-on circuit 38, and de-energizing the drive coil; at the same time, the states of the normally closed and normally open contacts (B1, B2) in the alarm circuit 40 are also changed, the normally open contact B1 is closed, and the normally closed contact B2 becomes disconnected, so that the alarm circuit 40 works and sends an alarm signal to the outside.

[0092] The structure of this embodiment enables the internal structure of the integrated contactor to form a modular structure, which can improve production efficiency and assembly efficiency and reduce product volume.

[0093] In the above embodiments, more than two melts may be provided, and the auxiliary contact system may be provided in more than two groups accordingly, or only one group of the auxiliary contact system may be provided. When one group is provided, all melts are connected in series with the auxiliary contact system in a mutually parallel manner. One end of the parallel melt conductively connected to the stationary contact may share a conductive connector, and then conductively connected to the stationary contact through the conductive connector.

[0094] In addition to the above-mentioned conductive contact methods, the conductive contact method between the first auxiliary contact 31 and the second auxiliary contact 32 in the above-mentioned embodiments can also be a flat plate conductive contact, an interference insertion conductive contact, or a stamping deformation insertion conductive contact.

[0095] Regardless of the conductive contact mode, the adjacent ends of the first auxiliary contact 31 and the second auxiliary contact 32 are staggered and insulated. Staggered insulation setting structure: one end of the second auxiliary contact 32 is located on the displacement path of one end of the first auxiliary contact 31, and an insulation distance is reserved between one end of the second auxiliary contact 32 and one end of the first auxiliary contact 31; when one end of the first auxiliary contact 31 is displaced by the first piston, one end of the first auxiliary contact 31 can be in conductive contact with one end of the second auxiliary contact 32.

[0096] When conductive contact is made in a flat plate manner, one end of the second auxiliary contact 32 and one end of the first auxiliary contact 31 which are arranged with staggered insulation are both planar structures. After conductive contact, the surface of one end of the first auxiliary contact 31 is in conductive contact with the surface of one end of the second auxiliary contact 32.

[0097] In order to buffer the impact force during conductive contact, an insulating guide column is provided, and the first auxiliary contact 31 and the second auxiliary contact 32 are respectively inserted into the guide column, and a spring is sleeved on the guide column to support the first auxiliary contact 31 and the second auxiliary contact 32. When the first auxiliary contact 31 is impacted by the first piston and conductively contacts with the second auxiliary contact 32, the spring is compressed under the driving of the impact force to achieve impact force buffering.

[0098] When the contact is made by interference insertion, one end of the first auxiliary contact 31 is a columnar structure, and one end of the second auxiliary contact 32 opposite to one end of the columnar structure of the first auxiliary contact 31 is a structure such as a groove structure or a hollow structure that allows the columnar structure to be inserted. When one end of the columnar structure of the first auxiliary contact 31 is driven and displaced by the first piston, one end of the columnar structure of the first auxiliary contact 31 can be inserted into the groove of the second auxiliary contact 32 by interference to make conductive contact, or break through the hollow structure and make conductive contact with the second auxiliary contact 32 by interference. In order to improve the contact performance, a spike structure is provided on the periphery of the columnar structure of the first auxiliary contact 31.

[0099] When one end of the first auxiliary contact 31 is a columnar structure, the first auxiliary contact with the columnar structure can be arranged on the impact end surface of the first piston, and the first auxiliary contact 31 is connected to the static contact through a flexible connecting wire.

[0100] When the contact is made by stamping and deforming and inserting the conductive contact, one end of the first auxiliary contact 31 is a flat plate structure, and the corresponding end of the second auxiliary contact 32 is provided with a groove structure, such as a U-shaped groove. When the flat plate structure at one end of the first auxiliary contact 31 is impacted by the first piston, under the impact force of the first piston, one end of the flat plate structure of the first auxiliary contact 31 is stamped and deformed and pressed against the groove structure of the second auxiliary contact 32 for conductive contact.

[0101] In the above scheme, the irreversible deformation of the elastic member can be achieved by setting the distance between the closed end of the elastic member and the end face of the moving guide rod so that when the second piston drives the elastic member to stretch and pushes the moving guide rod to drive the moving contact and the static contact to open, the deformation of the elastic member (that is, the travel distance of the closed end of the elastic member) is greater than the maximum elastic deformation of the elastic member, or in other words, the irreversible deformation is achieved by the distance between the position of the lower end face (end) of the closed end of the elastic member in the initial state and the position of the end of the moving guide rod facing the elastic member in normal opening, which is greater than the maximum elastic deformation of the elastic member. After the irreversible deformation of the elastic member, it can directly support the moving guide rod, so that the contactor can be kept in the opening position, preventing the rebound of the moving contact, and being more reliable after disconnection.

Claims

1. A contactor with integrated excitation function, characterized in that: include: A drive system and a contact system, wherein the contact system comprises a moving contact and two sets of stationary contacts, and the drive system comprises a movable moving guide rod, on which the moving contact is arranged and can be displaced relative to the moving guide rod under the action of an external force; under normal working conditions, the drive system drives the moving guide rod to displace, and the moving guide rod displaces the moving contact, thereby realizing normal opening and closing of the contact system; It also integrates an excitation ignition component, a first piston, a first conductive member, an auxiliary contact system, a melt, a push rod, a second piston, and an elastic member; The first conductive member is disposed on the impact end surface of the first piston; The fuse is connected in series with the auxiliary contact system, and two ends of the branch formed by the series connection of the fuse and the auxiliary contact system are connected in series between the two groups of the static contacts. The auxiliary contact system includes a conductive first auxiliary contact and a second auxiliary contact; one end of the first auxiliary contact and the second auxiliary contact are arranged with an insulating interval and are located between the fuse and the first conductive member, and the first conductive member is arranged corresponding to one end of the first auxiliary contact and the second auxiliary contact arranged with an insulating interval from each other; in an initial state, the first conductive member is not in contact with at least one of the first auxiliary contact and the second auxiliary contact; The push rod is located on the displacement path of the first conductive member, and the push rod is arranged corresponding to the melt; The elastic member is opposite to the moving contact and is arranged between the two stationary contacts. The elastic member is a tubular structure with one end open and the other end closed. The open end of the elastic member is sealed and fixedly arranged, and the closed end thereof is arranged in a free state toward the moving contact. The second piston is arranged in the elastic member, and one end of the second piston facing the open end of the elastic member is connected with the chamber between the excitation ignition component and the first piston through an air channel. The opening of the air channel for connecting the air channel with the chamber between the excitation ignition component and the first piston is located on the displacement path of the first piston. When the first piston is in the initial position, the first piston blocks the opening of the air channel, and the air channel and the internal space of the elastic member form a closed chamber. The excitation ignition component can be activated according to the received trigger signal to release a driving force capable of driving the first piston and the second piston to move; When the moving contact and the static contact are closed to form a main circuit, when an overload current, a short circuit current or an abnormal situation occurs, the excitation ignition component releases the driving force according to the received trigger signal, drives the first piston to drive the first conductive member to move, and makes the first auxiliary contact and the second auxiliary contact conductively contact through the first conductive member, so that the melt is connected to the main circuit in parallel; when the first piston continues to move, the air channel is connected to the chamber between the excitation ignition component and the first piston, and the driving force drives the second piston to move through the air channel, and the second piston drives the elastic member to produce irreversible deformation, and the elastic member in the irreversible deformation process drives the moving guide rod to move, so that the moving contact and the static contact are separated, and then the first piston drives the first conductive member to drive the push rod to move to disconnect the melt.

2. The contactor with integrated excitation function according to claim 1 is characterized in that the moving contact and one end of the static contact in conductive contact with the moving contact are located in a sealed chamber, and the sealed chamber is filled with a gas arc extinguishing medium; a guide structure with two ends through is opened on the top of the sealed chamber, and the elastic member is arranged in the guide structure, and its open end is fixedly arranged at one end of the guide structure, and the closed end is located in the guide structure; the airway includes a first part and a second part that are interconnected; the first part of the airway is arranged outside the sealed chamber and is connected to the chamber between the first piston and the excitation ignition component; the second part of the airway is inserted into the elastic member located in the guide structure from the outside of the sealed chamber and the open end of the elastic member; the second piston is arranged in the second part of the airway located in the elastic member in an interference fit manner; the driving force released by the excitation ignition component can drive the second piston to displace relative to the second part of the airway through the airway, and drive the closed end of the elastic member to displace, thereby generating irreversible deformation.

3. The contactor with integrated excitation function according to claim 2 is characterized in that the elastic part is a bellows, and on the outer peripheral surface of the second part of the air duct, a plurality of limiting sealing rings are arranged at intervals corresponding to the wave crest positions of the bellows, and the end faces of the limiting sealing rings are concave structures, and the concave structures of the limiting sealing rings abut against the wave crests of the bellows to press the bellows at the outer peripheral surface of the second part of the air duct; the closed end of the bellows is located on the outside of the second part of the air duct.

4. The contactor with an integrated excitation function according to any one of claims 1 to 3, characterized in that one end of the first auxiliary contact is conductively connected to a stationary contact, and one end of the second auxiliary contact is conductively connected to one end of the melt, or one end of the second auxiliary contact is conductively connected to a stationary contact, and one end of the first auxiliary contact is conductively connected to one end of the melt; the other end of the melt is conductively connected to another stationary contact; the first auxiliary contact and the second auxiliary contact are relatively insulated or staggered; when relatively insulated, the push rod is located between one end of the first auxiliary contact and the second auxiliary contact that are relatively insulated; the first piston drives the first conductive member to insert between the opposite ends of the first auxiliary contact and the second auxiliary contact, and after the first conductive member makes the first auxiliary contact and the second auxiliary contact conductively contact, the first conductive member pushes the push rod to move; when staggered, the push rod is located on the displacement path of the first auxiliary contact, and after the first piston drives the first conductive member to drive the first auxiliary contact to move and conductively contact with the second auxiliary contact, the first conductive member pushes the push rod to move.

5. The contactor with integrated excitation function according to claim 4 is characterized in that when the first auxiliary contact and the second auxiliary contact are staggered and insulated, the first auxiliary contact and the second auxiliary contact are in conductive contact in a flat plate manner, in conductive contact by interference insertion, or in conductive contact by stamping deformation insertion.

6. The contactor with integrated excitation function according to claim 5, characterized in that, when in conductive contact in a flat plate manner, the first auxiliary contact and the second auxiliary contact are both flat plate structures, and when they are in conductive contact, the two opposite surfaces of the first auxiliary contact and the second auxiliary contact are in conductive contact; When the first conductive member is in contact by interference insertion, the first conductive member replaces the first auxiliary contact, the first conductive member is conductively connected to the static contact through a flexible connection, and the second auxiliary contact is provided with a hollow structure or a hollow structure at the position corresponding to the first conductive member. When the first piston drives the first conductive member to displace, the first conductive member is inserted into the hollow structure of the second auxiliary contact, or penetrates and is inserted into the hollow structure of the second auxiliary contact, so that the second auxiliary contact is conductively contacted by interference insertion; When the first auxiliary contact is made in a conductive manner by means of stamping, deformation and insertion, the first auxiliary contact is a flat plate structure, and the second auxiliary contact is a groove structure. When the first piston drives the first conductive part to displace, the first conductive part causes the first auxiliary contact to be stamped, deformed and inserted into the groove structure of the second auxiliary contact for conductive contact. 7 . The contactor with integrated excitation function according to claim 6 , characterized in that a spike structure is provided on the outer peripheral surface of the first conductive member.

8. The contactor with integrated excitation function according to any one of claims 1 to 3 is characterized in that a butt-jointed sleeve and melt shell are further provided on one side of the contact system and the drive system, and a sealing cover plate is provided between the sleeve and the melt shell; the excitation ignition assembly, the first piston, and the first conductive member are respectively arranged in the sleeve in sequence, and an opening connected to the air passage is opened on the sleeve; the push rod is connected to the sealing cover plate by a mechanically disconnecting weak structure, the auxiliary contact system is arranged on the sealing cover plate, the sealing cover plate and the melt shell form an arc extinguishing chamber, and the melt is penetrated in the melt shell; when the first piston drives the first conductive member to displace, the first conductive member first makes the first auxiliary contact and the second auxiliary contact conductively contact, and pushes the push rod to separate from the sealing cover plate and then disconnect the melt.

9. The contactor with integrated excitation function according to claim 8, characterized in that the sealing cover plate is provided with a first protrusion and a second protrusion on two surfaces of the sleeve and the melt shell, respectively, and the first protrusion and the second protrusion have a through hollow portion, and the push rod is integrally formed in the hollow portion through the mechanical disconnection weakening structure; A partition-like structure is provided in the melt shell corresponding to the second protrusion, a displacement channel is provided on the partition-like structure, and the second protrusion is in contact with the end surface of the partition-like structure, so that the arc extinguishing medium is isolated from the hollow part of the second protrusion and the displacement channel of the partition-like structure; The melt passes through the arc extinguishing medium and the end surface where the second protrusion and the partition-like structure are butted; After the push rod breaks the melt, the push rod enters the displacement channel of the partition-like structure.

10. The contactor with integrated excitation function according to claim 8 is characterized in that it is also integrated with an internal trigger circuit, a micro switch, and a magnetic tripping device, wherein the internal trigger circuit is connected in parallel with the coil power circuit; the micro switch includes two groups of normally closed and normally open contacts; in one group of normally closed and normally open contacts, the normally open contact is connected in series in the internal trigger circuit, the normally closed contact is connected in series in the coil power circuit, and the other group of normally closed and normally open contacts can be connected in series in the alarm circuit; the magnetic tripping device includes a moving magnet and a static magnet, wherein the static magnet is arranged around one group of static contacts, the moving magnet is arranged corresponding to the static magnet, and when the current in the main circuit formed by the conductive contact between the moving contact and the static contact exceeds a threshold value, The moving magnet is located in the magnetic field loop generated by the static magnet, one end of the static magnet is rotatably arranged, and the other end is fixed by a spring support, and an air gap is retained between the moving magnet and the static magnet; the moving magnet is mechanically linked with the lever of the micro switch; when the current of the main circuit exceeds the threshold, the static magnet generates an adsorption force to adsorb and fix the moving magnet on the static magnet. During the adsorption process, the moving magnet drives the micro switch to operate, the normally open contact closes, and the normally closed contact opens, then the coil power circuit is de-energized, and the internal trigger circuit is turned on to send a trigger signal to the excitation ignition component. At the same time, the alarm circuit state changes and an alarm signal is sent.

11. The contactor with integrated excitation function according to claim 1 is characterized in that the driving system is connected to the moving contact through a moving guide rod, and a limit block is arranged on the periphery of the moving guide rod to limit the position of the moving contact when it is normally opened; when the moving contact is driven by the elastic member and the second piston, the limit block on the moving guide rod is disconnected, and the moving contact is opened under the drive of the elastic member and the second piston.

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