Excitation integrated contactor

Abstract

The utility model relates to the field of circuit protection and contactors, in particular to an excitation integrated contactor, an excitation action assembly, an auxiliary contact assembly, a melt and a melt disconnection assembly are integrated in the contactor, and the melt is conductively connected with a static contact through the auxiliary contact assembly to form a melt parallel branch; the piston does not act in a normal through-flow state, and the contactor performs switching-on and switching-off in a normal working state; in case of overload current, short-circuit current or abnormal conditions, the fuse body parallel branch is conducted through the excitation action assembly, so that the fuse body is connected into the main loop, and then the fuse body is disconnected after the contactor is forcibly opened through the excitation action assembly. According to the invention, under the normal function of the contactor, the fuse can be connected into the main loop for auxiliary arc extinguishing under the overload, short circuit or abnormal condition, so that the breaking capacity of the contactor is improved, and a large fracture is formed between contact systems of the contactor.

Description

Technical Field

[0001] The invention relates to circuit protection, in particular to a contactor for circuit protection, and in particular to an excitation integrated contactor in which an excitation action component is 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 to release high-pressure gas as a driving force, driving the piston to move, forcing the moving contact and the static contact assembly to disengage 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 move and the moving and static contacts after closing are forced to disengage, 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 in an incomplete and unreliable manner, and at the same time cause ablation of the device, posing a safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide an excitation integrated contactor, which can realize the function of the contactor in the process of opening and closing the normal current, and in the event of overload and short circuit, the fuse can be connected in parallel to the main circuit where the contact system is located after closing through the excitation action component, and then the moving contact and the static contact of the contactor are forced to be opened through the excitation action component, and a large current is introduced into the fuse parallel branch where the fuse is located to extinguish the arc, thereby improving the breaking capacity of the traditional contactor, and at the same time forming a large isolation break between the moving and static contacts of the contactor, avoiding the reignition of the arc between the contactor contacts and the contact welding. Through the integration technology, the contactor function, overload breaking function and zero current cutting-off function can be integrated into one device, which is easy to install, small in size, and does not need to consider the parameter matching between devices.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present invention is an excitation integrated contactor, comprising: a contact system, a drive system; the contact system comprises a moving contact and a stationary contact; the drive system comprises a drive coil, a moving iron core, and a moving guide rod; the moving contact is arranged on the moving guide rod; and further comprising: an excitation action component, an auxiliary contact component, a fuse, and a fuse disconnection component;

[0006] The excitation action component includes an excitation source and a piston. The excitation source is actuated according to a received trigger signal to release a driving force to drive the piston to move;

[0007] The fuse is conductively connected to the static contact through the auxiliary contact assembly to form a fuse parallel branch. The auxiliary contact assembly includes a moving auxiliary contact and a static auxiliary contact. In the initial state and when the contactor is normally opened and closed, the auxiliary contact assembly is in a normally open insulating fracture state, and the fuse parallel branch is not conductive. The moving auxiliary contact is located on the piston or on the displacement path of the piston, and the static auxiliary contact is located on the displacement path of the moving auxiliary contact. The fuse disconnection assembly is located in the direction of the piston displacement path and is arranged corresponding to the fuse or the melt parallel branch.

[0008] In the normal flow state, the piston does not move, and the drive system drives the moving contact to move relative to the piston to open and close the contactor in the normal working state;

[0009] When an overload current, a short circuit current or an abnormal situation occurs in the main circuit, the excitation source operates according to the received trigger signal and provides a driving force to drive the piston to move. The piston drives the moving auxiliary contact to make conductive contact with the static auxiliary contact to make the parallel branch of the fuse conductive. After the fuse is connected to the main circuit in parallel, the moving contact is driven to move to separate the moving contact and the static contact. After the contact system is separated: in the case of overload current and short circuit current, after the fuse blows, the piston drives the fuse disconnect component to mechanically disconnect the fuse or the parallel branch of the fuse; in an abnormal situation, the piston displacement drives the fuse disconnect component to mechanically disconnect the fuse or the parallel branch of the fuse.

[0010] Preferably, both ends of the melt are conductively connected to the stationary contacts via a set of auxiliary contact assemblies, or one end of the melt is conductively connected to one of the stationary contacts, and the other end of the melt is conductively connected to the other stationary contact via a set of auxiliary contact assemblies.

[0011] Preferably, the movable auxiliary contact and the static auxiliary contact are in conductive contact in one of the following ways: flat plate conductive contact, interference insertion conductive contact, or stamping deformation insertion conductive contact.

[0012] Preferably, when the conductive contact is made in a flat plate manner, the movable auxiliary contact and the static auxiliary contact are respectively flat plate structures, and when the movable auxiliary contact is driven, the conductive contact surfaces of the movable auxiliary contact and the static auxiliary contact are flat; when the conductive contact is made in an interference insertion manner, one of the movable auxiliary contact and the static auxiliary contact is a conductive column structure, and the other is provided with a hole structure that cooperates with the conductive column, and when the movable auxiliary contact is driven, the conductive column structure can be inserted into the hole structure; when the conductive contact is made in a stamping deformation insertion manner, the movable auxiliary contact is a sheet structure that is easy to deform, and the static auxiliary contact is provided with a groove corresponding to the movable auxiliary contact, and when the movable auxiliary contact is driven, the movable auxiliary contact is stamped into the groove of the static auxiliary contact.

[0013] Preferably, when the moving auxiliary contact is a conductive column, the conductive column is arranged on the impact end face of the piston; when the conductive contact is made by inserting the contact by stamping deformation, a columnar structure corresponding to the groove of the static auxiliary contact is arranged on the impact end section of the piston, and the columnar structure can stamp the moving auxiliary contact into the groove of the static auxiliary contact.

[0014] Preferably, when the movable auxiliary contact is a conductive column, a spike structure is provided on the outer peripheral surface of the conductive column.

[0015] Preferably, when the movable auxiliary contact is in conductive contact with the static auxiliary contact in a flat plate manner, the static auxiliary contact is supported by an elastic member.

[0016] Preferably, when the moving auxiliary contact is arranged on the displacement path of the piston, its structure includes: an auxiliary contact carrier fixing cylinder fixedly sleeved on the outer periphery of the moving guide rod, and the moving guide rod can be displaced relative to the auxiliary contact carrier fixing cylinder; an auxiliary contact carrier and an auxiliary contact carrier supporting spring are sequentially sleeved on the auxiliary contact carrier fixing cylinder, the auxiliary contact carrier is arranged toward the moving contact, and is arranged in a cross shape with the moving contact, and the auxiliary contact carrier can be displaced along the auxiliary contact carrier fixing cylinder; the moving auxiliary contact is arranged on the auxiliary contact carrier, and the static auxiliary contact is located on the displacement path of the moving auxiliary contact; the impact ends of the piston are respectively arranged corresponding to the auxiliary contact carrier; a contact spring and the moving contact are arranged on the moving guide rod between the end of the auxiliary contact carrier fixing cylinder and the static contact; when the piston is displaced, the auxiliary contact carrier can be driven to displace first, so that the moving auxiliary contact and the static auxiliary contact are in conductive contact, and then the moving contact is driven to displace for opening and closing.

[0017] Preferably, a limiting member is provided on the moving guide rod near the end of the auxiliary contact carrier fixing cylinder, and the contact spring and the moving contact are provided on the moving guide rod between the limiting member and the end of the moving guide rod.

[0018] Preferably, the limiting member is a limiting ring rib or a retaining spring arranged on the outer periphery of the moving guide rod.

[0019] Preferably, it further comprises a fuse housing, wherein the fuse housing is filled with an arc extinguishing medium, and the fuse penetrates the arc extinguishing medium to form a fuse structure.

[0020] Preferably, the fuse structure is located between the chamber where the drive system is located and the chamber where the contact system is located, and the auxiliary contact assembly is located in the chamber where the contact system is located; the fuse structure is provided with a displacement channel corresponding to the piston impact end, the fuse disconnection assembly is located in the displacement channel, and one end thereof protrudes from the fuse housing; the moving auxiliary contact is provided corresponding to the fuse disconnection assembly, and the static auxiliary contact is provided on an end face of the fuse disconnection assembly facing the moving auxiliary contact.

[0021] Preferably, the fuse disconnection component is a push rod, the push rod is integrally connected to the displacement channel on the fuse housing, and a disconnection weak point is provided at the connection between the push rod and the displacement channel.

[0022] Preferably, when there are two fuse structures and they are connected in series, the two fuse structures are respectively located on both sides of the drive coil, and the ends of the two fuse structures that are not connected in series are located in the chamber where the contact system is located, and are conductively connected to the static contact through the auxiliary contact assembly. The series conductive member between the ends of the two fuse structures connected in series is located in front of the displacement path when the moving iron core is opened, and a fuse disconnect assembly is arranged between the series conductive member and the moving iron core. When the piston displacement pushes the moving contact and the moving iron core to move, the moving iron core can push the fuse disconnect assembly to move and disconnect the series conductive member.

[0023] Preferably, the distance between the impact end surface of the piston and the movable auxiliary contact is smaller than the distance between the impact end surface of the piston and the movable contact.

[0024] Preferably, the end surface of the piston impact end is provided with a groove, the groove runs through both sides of the piston, the moving contact is arranged corresponding to the bottom of the groove, and the moving auxiliary contact is arranged corresponding to the end surfaces of the piston impact end on both sides of the groove; under normal working conditions, the moving contact does not contact the bottom of the groove.

[0025] Preferably, the groove of the piston is in a trumpet-shaped structure, and the moving contact passes through an open end of the trumpet-shaped structure of the piston and is located in the trumpet-shaped structure.

[0026] Preferably, the fuse and the stationary contact are respectively electrically connected to the auxiliary contact assembly in a flexible connection manner.

[0027] The excitation integrated contactor of the present invention can realize the function of the contactor in the normal current opening and closing process, and can quickly connect the fuse in the main circuit in parallel through the excitation action component when overload and short circuit occur, and then force the moving contact and the static contact of the contactor to open through the excitation action component, forming a large break opening between the moving contact and the static contact, and introducing a large current into the parallel branch where the fuse is located to limit the current and extinguish the arc, thereby improving the breaking capacity of the traditional contactor, and at the same time forming an isolation large break between the moving and static contacts of the contactor, thereby avoiding the reignition of the arc between the contactor contacts and the contact welding;

[0028] Since the fuse is not connected to the main circuit under the normal working current of the main circuit, the power consumption and temperature rise of the excitation integrated contactor proposed by the present invention can be greatly reduced compared with the combination of the traditional contactor and the fuse in series; moreover, in the event of special accidents (such as collision of electric vehicles), the circuit can be cut off with zero current and a safe and reliable large isolation break can be provided;

[0029] Through integration technology, the contactor function, overload disconnection function and zero current cut-off function are integrated into one device, which is easy to install, small in size and does not need to consider parameter matching between devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the circuit of the present invention, in which the excitation source is not triggered.

[0031] Figure 2 yes Figure 1 Circuit schematic after triggering.

[0032] Figure 3 yes Figure 1 to Figure 2 Logic timing diagram.

[0033] Figure 4 It is a schematic diagram of the appearance structure of the present invention.

[0034] Figure 5 It is a schematic diagram of the internal three-dimensional structure of the present invention.

[0035] Figure 6 It is a schematic diagram of the cross-sectional structure of the present invention.

[0036] Figure 7 yes Figure 6 A partial enlarged schematic diagram.

[0037] Figure 8 yes Figure 6 AA cross-sectional structure schematic diagram.

[0038] Fig. 9 It is a schematic diagram of the structure of an integrated excitation contactor with two fuses.

[0039] Fig.10 yes Fig. 9 AA section view.

[0040] Fig.11 It is a structural schematic diagram of the moving auxiliary contact and the static auxiliary contact of the flat-plate conductive contact.

[0041] Fig.12 It is a schematic diagram of the structure of the moving auxiliary contact and the static auxiliary contact in interference insertion conductive contact.

[0042] Fig.13 It is a schematic diagram of the structure of the moving auxiliary contact and the static auxiliary contact in the stamping deformation insertion conductive contact mode.

[0043] Reference numerals

[0044] Install the partition 100, static contact 1, moving contact 2, moving guide rod 3, auxiliary contact carrier 4, arc extinguishing chamber cover 5, support spring 51, melt 6, excitation source 7, fuse housing 8, static iron core 9, moving iron core 10, drive coil 11, shell 12, piston 13, guide part 131, impact part 132, wolf tooth thorn structure 133, moving auxiliary contact 14, sealing cover 15, static auxiliary contact 16, push rod 17, auxiliary contact carrier fixing cylinder 18, auxiliary contact carrier support spring 19, arc extinguishing medium 20, conductive connector 21, first soft connector 22, fuse structure 23, second soft connector 24, fuse structure 28, conductive bar 29, fuse disconnection assembly 30, limiting ring rib 31, pad 35, contact spring 36. DETAILED DESCRIPTION

[0045] The excitation integrated contactor of the present invention comprises: a contact system and a drive system; the contact system comprises a moving contact and a stationary contact; the drive system comprises a drive coil, a moving iron core and a moving guide rod; the moving contact is arranged on the moving guide rod; and further comprises: an excitation action component, an auxiliary contact component, a fuse and a fuse disconnection component;

[0046] The excitation action component includes an excitation source and a piston. The excitation source acts according to the received trigger signal, releases the driving force, and drives the piston to move;

[0047] The fuse is conductively connected to the static contact through the auxiliary contact assembly to form a fuse parallel branch. The auxiliary contact assembly includes a moving auxiliary contact and a static auxiliary contact. In the initial state and when the contactor is normally opened and closed, the auxiliary contact assembly is in a normally open insulating fracture state, and the fuse parallel branch is not conductive; the moving auxiliary contact is located on the piston or on the displacement path of the piston, and the static auxiliary contact is located on the displacement path of the moving auxiliary contact; the fuse disconnection assembly is located in the direction of the piston displacement path and is set corresponding to the fuse or the fuse parallel branch;

[0048] Under normal flow state, the piston does not move, and the drive system drives the moving contact to move relative to the piston to open and close the contactor under normal working state;

[0049] When overload current, short circuit current or abnormal situation occurs in the main circuit, the excitation source acts according to the received trigger signal and provides driving force to drive the piston to move. The piston drives the moving auxiliary contact to make conductive contact with the static auxiliary contact to make the fuse parallel branch conductive. After the fuse is connected to the main circuit in parallel, the moving contact is driven to move to separate the moving contact and the static contact. After the contact system is separated: in the case of overload current and short circuit current, after the fuse blows, the piston drives the fuse disconnect component to mechanically disconnect the fuse or the fuse parallel branch; in abnormal situation, the piston displacement drives the fuse disconnect component to mechanically disconnect the fuse or the fuse parallel branch.

[0050] See also Figure 1 and Figure 2 , which is the basic circuit diagram of the present invention. Under normal working conditions, the fuse and the static contact are not conducting. Under normal working conditions, the contactor performs normal opening and closing operations, and the excitation action component does not operate. When the contactor is in the closed state, when an overload current or a short-circuit current occurs, the excitation action component operates. Before the contactor opens, the excitation action component makes the two ends of the fuse conductively connected to the two static contacts, and connects the fuse in the main circuit in parallel to form a fuse parallel branch. Then, while keeping the fuse parallel branch conductive, the excitation action component drives the moving contact and the static contact to open and disconnect the main circuit. After the disconnection, the large current of the main circuit flows through the fuse, and the fuse is hot-melted and blown. As the excitation action component continues to move, a large fracture is formed between the moving and static contacts. At the same time, the excitation action component drives the melt disconnection component to disconnect the fuse. In abnormal situations, the piston displacement drives the melt disconnection component to mechanically disconnect the fuse or the melt parallel branch.

[0051] See also Figure 3 , its logical sequence is:

[0052] Before time t0, it belongs to the normal closing working period. When overload current occurs, during the period t0-t1, the excitation source receives the trigger signal. At time t1, the excitation source triggers the action. During the period t1-t2, the piston moves. During the period t2-t4, the fuse is connected to the main circuit. During the period t2-t3, the moving contact and the static contact lose conductive contact, the main circuit is disconnected, and the current flows through the fuse. During the period t3-t4, the fuse is disconnected, completely disconnecting the main circuit.

[0053] In view of the above technical scheme and principle, preferred embodiments are now cited and specifically described in conjunction with drawings.

[0054] See also Figures 4 to 8 , including a housing 12, in which a contactor structure, an excitation action component, an auxiliary contact component, and a fuse are arranged. The contactor structure mainly includes a contact system and a drive system located in the housing 12, and a chamber where the contact system is located and a chamber where the drive system is located are separated by installing a partition 100.

[0055] The driving system includes a driving coil 11, a moving iron core 10, a stationary iron core 9, a moving guide rod 3, a U-shaped yoke, and a magnetic tube. One end of the moving guide rod 3 is fixedly arranged on the moving iron core 10, and the other end passes through the stationary iron core 9 and the partition plate, and is located in the chamber where the contact system is located. A limiting ring rib 31 is arranged on the outer periphery of the moving guide rod 3 located in the chamber where the contact system is located, and a limiting end plate is arranged at the end of the moving guide rod 3 facing the stationary contact 1.

[0056] The contact system includes a static contact 1 and a moving contact 2. The moving contact 2 is movably mounted on the moving guide rod 3 between the limiting ring rib 31 of the moving guide rod 3 and the limiting end plate. A moving contact spring 36 is mounted between the moving contact 2 and the limiting ring rib 31 to support the moving contact 2. The moving contact spring 36 is always in a compressed state. The static contact 1 is arranged with an insulating interval corresponding to the moving contact 2. One end of the static contact 1 is located in the chamber where the contact system is located, and the other end passes through the top of the chamber where the contact system is located and the top of the housing 12, and is located outside the housing 12 to facilitate connection with the main circuit. In order to facilitate installation, the limiting ring rib 31 on the moving guide rod 3 can be realized by setting a retaining spring on the outer periphery of the moving guide rod 3.

[0057] If there are any issues not covered in the contactor structure, please refer to the existing contactor technology.

[0058] A fuse structure 23 is also provided between the chamber where the drive system is located and the chamber where the contact system is located. The fuse structure 23 includes a fuse housing 8 and a fuse housing cover 5. The fuse housing 8 is located on the mounting partition. The fuse housing cover 5 covers the fuse housing 8 and seals the fuse housing 8. The fuse housing 8 and the fuse housing cover 5 are provided with sleeves protruding toward each other on opposite sides. When the fuse housing cover 5 covers the fuse housing 8, the sleeves on the fuse housing 8 and the fuse housing cover 5 are mutually sleeved to form a channel for the moving guide rod 3 to pass through. The moving guide rod 3 passes through the partition and the channel of the fuse structure 23 to enter the chamber where the contact system is located. A fuse disconnection assembly 17 is formed integrally on the fuse housing cover 5 on opposite sides of the moving guide rod 3. In this embodiment, the fuse disconnection assembly 17 is a push rod, hereinafter referred to as the push rod 17. The connection between the push rod 17 and the fuse housing cover 5 is set as a disconnection weak point to reduce the mechanical strength. The disconnection weak point is a groove structure around the outer periphery of the push rod 17, or a hollow connection is set in a spoke shape around the outer periphery of the push rod 17, or a hollow structure of other shapes, so that the push rod 17 can be disconnected from the fuse housing cover 5 when driven. One end of the push rod 17 protrudes in the chamber where the contact system is located. Annular bosses are respectively set at the corresponding positions on both sides of the fuse housing cover 5 outside the disconnection weak point connected to the outer periphery of the push rod 17, and an annular supporting boss is set at the corresponding annular boss of the fuse housing 8. When the fuse housing cover 5 is covered on the fuse housing 8, the supporting boss located inside the fuse structure is connected to the annular boss to form a displacement channel for the push rod 17 to move after being separated from the fuse housing cover 5. A sealed arc extinguishing chamber is formed between the fuse housing 8, the fuse housing cover 5, the passage through which the movable guide rod 3 passes, and the displacement passage, and the arc extinguishing chamber is filled with an arc extinguishing medium 20. The melt 6, as the melt of the fuse structure 23, is penetrated in the arc extinguishing medium 20 and passes through the displacement passage, and both ends of the melt 6 pass through the contact surfaces on opposite sides of the fuse housing 8 and the fuse housing cover 5 and are located in the chamber where the contact system is located.

[0059] Limiting ridges are arranged at intervals on the surface of the fuse housing cover plate 5 facing the contact system, and a sealing cover plate 15 is arranged on the fuse housing cover plate 5. The sealing cover plate 15 is located outside the limiting ridges of the fuse housing cover plate 5, and the sealing cover plate 15 is positioned by the limiting ridges. The fuse housing cover plate 5 and the sealing cover plate 15 form a chamber where the contact system is located, and the static contact 1 is arranged on the sealing cover plate 15, one end of which passes through the sealing cover plate 15 and the housing 12 and is located outside the housing 12, and the other end is located inside the sealing cover plate 15.

[0060] The excitation action component includes an excitation source 7 and a piston 13. A cavity is provided at the top of the sealing cover plate 15 between the two static contacts 1, and the excitation source 7 and one end of the piston 13 are arranged in the cavity of the sealing cover plate 15. The trigger signal receiving end of the excitation source 7 passes through the sealing cover plate 15 and the housing 12, and can be connected to an external trigger signal circuit. The piston 13 includes a guide portion 131 and an impact portion 132. The guide portion of the piston 13 is arranged in the cavity on the sealing cover plate 15 where the excitation source 7 is located, and the guide portion of the piston 13 is in sealed contact with the contact surface of the cavity, for example, by providing a sealing ring on the outer periphery of the guide portion of the piston 13, or by interference fit between the guide portion of the piston 13 and the inner wall of the cavity of the sealing cover plate. A groove is provided on the end face of the guide portion of the piston 13 facing the end where the driving force of the excitation source 7 is released. The impact portion of the piston 13 is located between the two static contacts 1. The end surface of the impact part 132 of the piston 13 is provided with a groove of a trumpet-shaped structure that runs through both sides thereof, and the trumpet-shaped structure is a structure in which the distance between the open end is greater than the distance between the bottom of the groove. The two sides of the impact part of the trumpet-shaped structure are respectively located on both sides of the line connecting the two static contacts 1. The bottom of the groove of the impact part of the piston 13 is arranged opposite to the moving contact 2, that is, the impact ends on both sides of the impact part of the piston 13 span the moving contact 2 and are located on the outside of the moving contact 2. In the initial position, a certain gap is retained between the bottom of the groove of the impact part of the piston 13 and the moving contact 2, and the gap is sufficient to ensure that the moving contact 2 will not contact the piston 13 during normal closing displacement. Figure 4 As shown, the impact part with a trumpet-shaped structure can provide a portion of displacement space for the displacement avoidance of the moving contact, thereby reducing the overall volume of the contactor.

[0061] The excitation source 7 is a gas generator, which can ignite and generate high-pressure gas as a driving force according to the received trigger signal. The trigger signal received by the excitation source 7 can be a trigger signal from the outside, or a trigger signal sent by its own internal trigger circuit. The internal trigger circuit is used to monitor the main circuit current. When the current exceeds the threshold, the internal trigger circuit is turned on to send a trigger signal to the excitation source 7.

[0062] A support spring 51 is sleeved on the annular boss on the fuse housing cover 5 in the chamber where the contact system is located, and a static auxiliary contact 16 is fixedly connected to the support spring 51. The static auxiliary contact 16 is conductively connected to the static contact 1 through the conductive connector 21 and the first soft connector 22, that is, one static auxiliary contact 16 is connected to the soft connector 22, the soft connector 22 is connected to the conductive connector 21, and the conductive connector 21 is conductively connected to one static contact 1. The static auxiliary contact 16 is sleeved on the outer periphery of the push rod 17. The connection between the two push rods 7 and the connection line between the two static contacts are arranged in a cross shape.

[0063] An auxiliary contact carrier fixing cylinder 18 is sleeved on the moving guide rod 3, one end of which is located in the passage of the fuse structure 23 through which the moving guide rod 3 passes, and the other end protrudes out of the fuse structure 23 and is located in the chamber where the contact system is located. The auxiliary contact carrier fixing cylinder 18 is fixedly arranged, and the moving guide rod 3 can be displaced relative to the auxiliary contact carrier fixing cylinder 18. The limiting ring rib 31 on the moving guide rod 3 is located between the end of the auxiliary contact carrier fixing cylinder 18 and the moving contact 2. One end surface of the auxiliary contact carrier fixing cylinder 18 facing the limiting ring rib 31 is turned outward to form an end limiting structure. An auxiliary contact carrier support spring 19 is sleeved on the auxiliary contact carrier fixing cylinder 18 located in the chamber where the contact system is located. An auxiliary contact carrier 4 is sleeved on the auxiliary contact carrier fixing cylinder 18 between the auxiliary contact carrier support spring 19 and the end limit structure of the auxiliary contact carrier fixing cylinder 18. The auxiliary contact carrier 4 is supported by the auxiliary contact carrier support spring 19, and the auxiliary contact carrier support spring 19 is always in a compressed state. The auxiliary contact carrier 4 is a flat plate structure, which is arranged in a cross shape with the moving contact 2 and is arranged corresponding to the impact end of the piston 13. When the piston 13 is displaced, the impact end of the piston 13 first drives the auxiliary contact carrier 4 to displace, and then drives the moving contact 2 to displace through the bottom of the groove of the piston 13. The auxiliary contact carrier 4 is made of insulating material, and its two ends are respectively arranged corresponding to the static auxiliary contact 16 and the push rod 17. A moving auxiliary contact 14 is fixedly arranged at the positions corresponding to the static auxiliary contacts 16 at both ends of the auxiliary contact carrier 4, and the two moving auxiliary contacts 14 on the auxiliary contact carrier 4 are arranged with insulation. A movable auxiliary contact 14 is conductively connected to one end of the melt 6 via a second flexible connector 24 .

[0064] It can be known from the above structure that: a static auxiliary contact 16 is extended and conductively connected at one end of each static contact, and a dynamic auxiliary contact 14 is extended and conductively connected at both ends of the fuse 6. One static auxiliary contact 16 corresponds to one dynamic auxiliary contact 14, forming two pairs of auxiliary contact assemblies, that is, the two ends of the fuse 6 are conductively connected to the static contact through a group of auxiliary contact assemblies. The auxiliary contact assembly is made of conductive material, and the first soft connector and the second soft connector are also made of conductive material, which can be a wire, a flexible conductive sheet, etc. In a pair of auxiliary contact assemblies, the static auxiliary contact is located on the displacement path of the dynamic auxiliary contact. In the initial position or the normal state of the contactor, the dynamic auxiliary contact and the static auxiliary contact of the auxiliary contact assembly are arranged in an insulating fracture structure, that is, a sufficient insulation distance is retained between the dynamic auxiliary contact and the static auxiliary contact. When the fuse 16 is conductively connected to the static contact through the auxiliary contact assembly to form a fuse parallel branch, in the initial position or the normal state of the contactor, the moving auxiliary contact and the static auxiliary contact of the auxiliary contact assembly are set in an insulating break state, and the fuse parallel branch is not conductive. Only when the piston 13 is displaced can the moving auxiliary contact and the static auxiliary contact be driven to conductively contact, so that the insulating break of the auxiliary contact assembly is closed and conductive, and the fuse parallel branch is conductive, and the fuse is connected in parallel to the main circuit after the static contact and the moving contact are closed.

[0065] When the piston 13 is displaced, the auxiliary contact carrier 4 is driven to drive the two movable auxiliary contacts 14 to displace, and the movable auxiliary contact 14 is in conductive contact with the static auxiliary contact 16, that is, the two ends of the melt 6 are in conductive contact with one of the static contacts 1 through a pair of auxiliary contact assemblies, respectively, so that the melt 6 is connected in parallel to the main circuit where the static contact and the movable contact are located after closing to form a parallel melt branch of the main circuit. Since the movable auxiliary contact and the static auxiliary contact are connected by soft connectors, the displacement of the relevant action parts will not be affected.

[0066] Working principle:

[0067] Under normal working conditions, the drive coil 11 is energized, the static iron core 9 attracts the moving iron core 10, the moving contact 2 is in conductive contact with the static contact 1, the switch is closed, and the main circuit is connected; the drive coil 11 is de-energized, the moving contact 2 is out of conductive contact with the static contact 1, the switch is opened, and the main circuit is disconnected.

[0068] When there is an overload current or a short circuit current, the excitation source 7 receives a trigger signal, ignites and releases high-pressure gas as a driving force, drives the piston 13 to move, and the impact end of the piston 13 drives the auxiliary contact carrier 4 to move. The movable auxiliary contact 14 on the auxiliary contact carrier 4 is in conductive contact with the static auxiliary contact 16, and the melt 6 is connected to the main circuit, so that the melt 6 is connected in parallel with the main circuit to form a melt parallel branch. At this time, the movable contact and the static contact are in a closed state, and the piston 13 is not in contact with the movable contact 2. The piston 13 continues to move, and the groove bottom of the impact part of the piston 13 drives the movable contact 2 to move, so that the movable contact 2 and the static contact 1 are forced to open; during the displacement of the piston 13, the auxiliary contact carrier support spring 19 is compressed. When the movable contact 2 and the static contact 1 are forced to open, the main circuit is disconnected, and the melt 6 is melted. The piston 13 pushes the push rod 17 to disconnect from the fuse housing cover 5, and moves along the displacement channel in the fuse structure 23 to disconnect the melt 6.

[0069] In abnormal situations (such as car collisions, etc.), the working principle is almost exactly the same as the working principle in overload current or short-circuit current. The only difference is that the excitation source actively sends the trigger signal after receiving it, and actively cuts off the main circuit, instead of passively sending the trigger signal and passively cutting off the main circuit because of the main circuit current overload or short circuit. The active sending of the trigger signal can be sent by an external control system or by a detection module integrated in the contactor. The detection module includes sensors such as pressure sensors that can sense abnormal situations, internal trigger circuits, control switches, and internal control systems. For example, when a car collides, the pressure sensor converts the sensed pressure signal into an electrical signal and sends it to the internal control system. The internal control system compares it. When the pressure exceeds the set threshold, the internal control system controls the control switch to turn on the internal trigger circuit and send a trigger signal to the excitation source. The excitation source acts according to the received trigger signal. The principle of sending the trigger signal by the external control system is the same as the principle of sending the internal trigger signal.

[0070] Since the static auxiliary contact 16 is supported by the support spring, the impact energy of the dynamic auxiliary contact 14 on the static auxiliary contact 16 can be buffered, making the conductive contact between the dynamic auxiliary contact 14 and the static auxiliary contact 16 more reliable. And the support spring is extended and retracted to provide a sufficient displacement distance for the piston 13.

[0071] Arc extinguishing principle and advantages:

[0072] When the contactor is in normal working state, the fuse 6 is not connected to the main circuit. Therefore, in normal working state, the power consumption of the contactor does not increase, and is almost the same as that of the traditional contactor.

[0073] In case of overload, short circuit or abnormal situation, before forced opening, fuse 6 is first connected in parallel. Since the resistance of fuse 6 is much greater than the resistance of the main circuit, when the current is normally flowing, almost all the current flows through the main circuit, and the current flowing through fuse 6 can be ignored. When forced opening, since the impedance between the moving contact and the static contact gradually increases and is much higher than the resistance of fuse 6, before opening, most of the current flows through fuse 6, and fuse 6 fully limits the current flowing through. When the opening is critical, the current in the main circuit is already very small. After opening, the arc between the moving contact and the static contact is very small, and the arc can be easily extinguished by air or arc extinguishing gas filled in the chamber where the contact system is located, and will not cause arc erosion of the contact system; then fuse 6 melts or cuts off, and the fracture of fuse 6 melting or cutting is designed in the arc extinguishing medium, and the arc generated when fuse 6 forms a fracture is small, and the arc extinguishing medium participates in arc extinguishing, which can well achieve arc extinguishing.

[0074] The solution of the present invention connects the fuse to the main circuit in the early stage of opening, which can greatly reduce the power consumption of the contactor, improve the breaking capacity and arc extinguishing capacity of the contactor, and make it better matched with the fuse.

[0075] In the above embodiment, the fuse structure is one. In other embodiments, the fuse can be at least two or more, see Fig. 9 and Fig.10 The chamber where the drive system is located and the chamber where the contact system is located are separated by a mounting partition 100, and limiting ridges are arranged at intervals on the mounting partition. The sealing cover plate 15 is installed on the mounting partition outside the limiting ridge to form a chamber where the contact system is located. Two fuse structures 28 are arranged in the contact, and the two fuse structures 28 are respectively located outside the drive coil 11, and are located in the chamber where the drive system is located together with the drive coil 11 and the moving iron core 10. The two fuse structures 28 include a fuse shell, an arc extinguishing medium and a fuse 6. The two ends of the fuse 6 pass through the fuse shell, wherein the ends of the fuses 6 of the two fuse structures 28 away from the static contact 1 are connected in series through a conductive bar 29, and the two fuse structures 28 are connected in series together, and the other ends of the fuses 6 of the two fuse structures 28 pass through the mounting partition to enter the chamber where the contact system is located, and are respectively conductively connected to the moving auxiliary contact 14 arranged on the auxiliary contact carrier 4 through the second soft connector 24. The two stationary contacts 1 are conductively connected to the stationary auxiliary contacts 16 mounted on the mounting partition through the conductive connectors 21 and the first flexible connectors 22 respectively, and the stationary auxiliary contacts 16 are supported by support springs.

[0076] A backing plate 35 is provided between the U-shaped yoke outside the driving coil and the housing 12. An annular boss is provided on the backing plate 35 at the position of the magnetic cylinder corresponding to the position of the moving iron core 10. The annular boss of the backing plate 35 is sleeved in the magnetic cylinder. The conductive bar 29 is located between the backing plate 35 and the U-shaped yoke. The conductive bar 29 passes through the annular boss of the backing plate 35 and is recessed toward the inside of the annular boss at the annular boss to form an accommodating groove.

[0077] The melt disconnection component 30 is located in the magnetic cylinder between the annular limiting boss, the conductive bar 29 and the moving iron core 10. The melt disconnection component 30 includes a support block and a piston-like push rod integrally formed on the support block. The connection between the push rod and the support block is set as a disconnection weak point. The support block of the melt disconnection component 30 is interference fit with the magnetic cylinder, and the push rod is set corresponding to the accommodating cavity of the conductive bar 20. The end of the moving guide rod 3 passes through the moving iron core 10 and protrudes toward the direction of the melt disconnection component 30, and the push rod is set corresponding to the end of the moving guide rod 3.

[0078] Working principle:

[0079] During normal operation, the drive coil is powered on and off, the contactor opens and closes normally, and the excitation source does not operate.

[0080] When there is an overload current or a short circuit current, the excitation source receives a trigger signal and ignites, releasing high-pressure gas as a driving force to drive the piston 13 to move. The piston first drives the auxiliary contact carrier 4 to move, so that the movable auxiliary contact 14 is in conductive contact with the static auxiliary contact 16, and the two fuses 28 connected in series are connected to the main circuit. At this time, the movable contact and the static contact maintain conductive contact, and the main circuit remains conductive; the piston 13 continues to move, driving the movable contact 2, the movable guide rod 3 and the movable iron core 10 to move together, so that the movable contact 2 is out of conductive contact with the static contact 1, and the main circuit is disconnected. Due to the access of the fuse, the current flowing through the main circuit flows through the fuse. Since the resistance of the fuse is much larger than the resistance of the main circuit, the current flowing through the fuse is reduced exponentially, and the fuse melts under the thermal melting effect. The piston continues to move, pushing the moving contact 2, the moving guide rod 3 and the moving iron core 10 to continue to move. The end of the moving guide rod 3 pushes the push rod to detach from the support block of the fuse disconnecting assembly 30, driving the push rod to move and disconnect the conductive bar 29, so that the two fuses in series are disconnected, and a physical break is formed between the two fuses 28, thereby preventing possible incomplete arc extinguishing.

[0081] In abnormal situations (such as car collisions), the working principle is almost exactly the same as that in overload current or short-circuit current. The only difference is that the excitation source actively sends the trigger signal after receiving it, and actively cuts off the main circuit, instead of passively sending the trigger signal because of main circuit current overload or short circuit.

[0082] In the above embodiment, two sets of auxiliary contact assemblies are used, in which the static auxiliary contact is connected to the static contact, and the moving auxiliary contact is connected to both ends of the fuse. In other embodiments, the static auxiliary contact can also be connected to both ends of the fuse, and the moving auxiliary contact can be connected to both ends of the static contact, as long as the connection through the soft connector does not affect the operation of each component.

[0083] A set of auxiliary contact components can also be used, then one end of the melt is conductively connected to one of the static contacts, and the other end of the melt is conductively connected to another static contact through the auxiliary contact component. This connection method can be: the other end of the melt is connected to the static auxiliary contact, and the other static contact is connected to the moving auxiliary contact, so that the static auxiliary contact is located on the displacement path of the moving auxiliary contact, and the moving auxiliary contact is conductively contacted with the static auxiliary contact through piston drive, so that the melt is connected to the main circuit in parallel. It can also be that the other end of the melt is connected to the moving auxiliary contact, and the other static contact is connected to the static auxiliary contact.

[0084] The movable auxiliary contact and the static auxiliary contact in the auxiliary contact assembly of the present invention are in conductive contact in the following ways: flat plate conductive contact, interference insertion conductive contact, or stamping deformation insertion conductive contact.

[0085] In the above embodiment, the movable auxiliary contact and the static auxiliary contact are in conductive contact via a flat plate. Fig.11 The auxiliary contact carrier 4 is a flat plate, on which the movable auxiliary contacts 14 are arranged at intervals, and the static auxiliary contacts 16 are also arranged in a flat plate structure, and the static auxiliary contacts 6 are supported by the support spring 51. The auxiliary contact carrier 4 is driven by the piston 13 to drive the movable auxiliary contacts 14 and the static auxiliary contacts 16 to make conductive contact. The support spring 51 can buffer the impact force brought by the movable auxiliary contacts.

[0086] The moving auxiliary contact and the static auxiliary contact are in conductive contact by interference insertion, see Fig.12 , a moving auxiliary contact is directly arranged on the impact end of the piston 13 corresponding to the static auxiliary contact. The moving auxiliary contact is a conductive columnar structure, and the piston 13 is made of insulating material. The static auxiliary contact corresponding to the moving auxiliary contact is arranged as a conductive structure with a hollow portion. When the piston 13 is displaced, the moving auxiliary contact can be inserted into the hollow portion of the static auxiliary contact in an interference fit manner to achieve conductive contact between the moving auxiliary contact and the static auxiliary contact. In order to improve contact reliability, a spike structure 133 is arranged on the periphery of the column of the moving auxiliary contact.

[0087] The moving auxiliary contact and the static auxiliary contact are in conductive contact by means of stamping, deformation and insertion. Fig.13, the impact end of the corresponding moving auxiliary contact of the piston 13 is set as a columnar structure. The moving auxiliary contact is arranged on the displacement path of the piston 13. The moving auxiliary contact is arranged as a conductive sheet structure, and is arranged through a limiting structure, such as a hollow support member is arranged on the cover plate of the fuse housing, and the moving auxiliary contact is attached thereto with glue. The static auxiliary contact corresponds to the columnar impact end of the piston 13, and is provided with a hollow part structure. When the piston 13 is displaced, it can drive the moving auxiliary contact to displace onto the static auxiliary contact, and continue to displace, so that the moving auxiliary contact of the conductive sheet structure is deformed, and is punched into the hollow part of the static auxiliary contact by the impact end of the piston 13, so as to achieve conductive contact.

[0088] exist Fig.12 and Fig.13 In the embodiment, there is no need to provide structures such as the auxiliary contact carrier fixing cylinder 18, the auxiliary contact carrier supporting spring 19, and the auxiliary contact carrier 4.

Claims

1. An excitation integrated contactor, characterized in that: Including: contact system, drive system; The contact system includes a moving contact and a stationary contact; The driving system comprises a driving coil, a moving iron core and a moving guide rod; The moving contact is arranged on the moving guide rod; and further comprises: an excitation action component, an auxiliary contact component, a fuse, and a fuse disconnection component; The excitation action component includes an excitation source and a piston. The excitation source is actuated according to a received trigger signal to release a driving force to drive the piston to move; The fuse is conductively connected to the static contact through the auxiliary contact assembly to form a fuse parallel branch. The auxiliary contact assembly includes a moving auxiliary contact and a static auxiliary contact. In the initial state and when the contactor is normally opened and closed, the auxiliary contact assembly is in a normally open insulating fracture state, and the fuse parallel branch is not conductive. The moving auxiliary contact is located on the piston or on the displacement path of the piston, and the static auxiliary contact is located on the displacement path of the moving auxiliary contact. The fuse disconnection assembly is located in the direction of the piston displacement path and is arranged corresponding to the fuse or the melt parallel branch. In the normal flow state, the piston does not move, and the drive system drives the moving contact to move relative to the piston to open and close the contactor in the normal working state; When an overload current, a short circuit current or an abnormal situation occurs in the main circuit, the excitation source operates according to the received trigger signal and provides a driving force to drive the piston to move. The piston drives the moving auxiliary contact to make conductive contact with the static auxiliary contact to make the parallel branch of the fuse conductive. After the fuse is connected to the main circuit in parallel, the moving contact is driven to move to separate the moving contact and the static contact. After the contact system is separated: in the case of overload current and short circuit current, after the fuse blows, the piston drives the fuse disconnect component to mechanically disconnect the fuse or the parallel branch of the fuse; in an abnormal situation, the piston displacement drives the fuse disconnect component to mechanically disconnect the fuse or the parallel branch of the fuse.

2. The excitation integrated contactor according to claim 1, characterized in that: The two ends of the melt are respectively conductively connected to the stationary contacts through a group of auxiliary contact assemblies, or one end of the melt is conductively connected to one of the stationary contacts, and the other end of the melt is conductively connected to another stationary contact through a group of auxiliary contact assemblies.

3. The excitation integrated contactor according to claim 2, characterized in that: The movable auxiliary contact and the static auxiliary contact are in conductive contact in one of the following ways: flat plate conductive contact, interference insertion conductive contact, or stamping deformation insertion conductive contact.

4. The excitation integrated contactor according to claim 3, characterized in that: When the conductive contact is made in a flat plate manner, the movable auxiliary contact and the static auxiliary contact are respectively flat plate structures. When the movable auxiliary contact is driven, the conductive contact surface between the movable auxiliary contact and the static auxiliary contact is a plane. When the conductive contact is made in an interference insertion manner, one of the movable auxiliary contact and the static auxiliary contact is a conductive column structure, and the other is provided with a hole structure that matches the conductive column. When the movable auxiliary contact is driven, the conductive column structure can be inserted into the hole structure. When the movable auxiliary contact is contacted by means of stamping deformation and insertion for conductive contact, the movable auxiliary contact is a sheet-like structure that is easy to deform, and the static auxiliary contact is provided with a groove corresponding to the movable auxiliary contact. When the movable auxiliary contact is driven, the movable auxiliary contact is stamped into the groove of the static auxiliary contact.

5. The excitation integrated contactor according to claim 4, characterized in that: When the moving auxiliary contact is a conductive column, the conductive column is arranged on the impact end face of the piston; when the conductive contact is made by inserting and deforming by stamping, a columnar structure corresponding to the groove of the static auxiliary contact is arranged on the cross-section of the impact end of the piston, and the columnar structure can stamp the moving auxiliary contact into the groove of the static auxiliary contact.

6. The excitation integrated contactor according to claim 5, characterized in that: When the movable auxiliary contact is a conductive column, a spike structure is provided on the outer peripheral surface of the conductive column.

7. The excitation integrated contactor according to claim 4, characterized in that: When the movable auxiliary contact is in conductive contact with the static auxiliary contact in a flat plate manner, the static auxiliary contact is supported by an elastic member.

8. The excitation integrated contactor according to claim 1, characterized in that: When the moving auxiliary contact is arranged on the displacement path of the piston, its structure includes: an auxiliary contact carrier fixing cylinder fixedly sleeved on the outer periphery of the moving guide rod, and the moving guide rod can be displaced relative to the auxiliary contact carrier fixing cylinder; an auxiliary contact carrier and an auxiliary contact carrier supporting spring are sequentially sleeved on the auxiliary contact carrier fixing cylinder, the auxiliary contact carrier is arranged toward the moving contact, and is arranged in a cross shape with the moving contact, and the auxiliary contact carrier can be displaced along the auxiliary contact carrier fixing cylinder; the moving auxiliary contact is arranged on the auxiliary contact carrier, and the static auxiliary contact is located on the displacement path of the moving auxiliary contact; the impact ends of the piston are respectively arranged corresponding to the auxiliary contact carrier; a contact spring and the moving contact are arranged on the moving guide rod between the end of the auxiliary contact carrier fixing cylinder and the static contact; when the piston is displaced, the auxiliary contact carrier can be driven to displace first, so that the moving auxiliary contact and the static auxiliary contact are in conductive contact, and then the moving contact is driven to displace for opening and closing.

9. The excitation integrated contactor according to claim 8, characterized in that: A limiting piece is arranged on the moving guide rod near the end of the auxiliary contact carrier fixing cylinder, and the contact spring and the moving contact are arranged on the moving guide rod between the limiting piece and the end of the moving guide rod.

10. The excitation integrated contactor according to claim 9, characterized in that: The limiting member is a limiting ring rib or a retaining spring arranged on the outer periphery of the moving guide rod.

11. The excitation integrated contactor according to any one of claims 1 to 10, characterized in that: It also includes a fuse housing, in which an arc extinguishing medium is filled, and the fuse body is penetrated in the arc extinguishing medium to form a fuse structure.

12. The excitation integrated contactor according to claim 11, characterized in that: The fuse structure is located between the chamber where the drive system is located and the chamber where the contact system is located, and the auxiliary contact assembly is located in the chamber where the contact system is located; the fuse structure is provided with a displacement channel corresponding to the piston impact end, the fuse disconnection assembly is located in the displacement channel, and one end thereof protrudes from the fuse housing; the moving auxiliary contact is provided corresponding to the fuse disconnection assembly, and the static auxiliary contact is provided on an end face of the fuse disconnection assembly facing the moving auxiliary contact.

13. The excitation integrated contactor according to claim 12, characterized in that: The fuse disconnection component is a push rod, which is integrally connected to the displacement channel on the fuse housing, and a disconnection weak point is provided at the connection between the push rod and the displacement channel.

14. The excitation integrated contactor according to claim 11, characterized in that: When there are two fuse structures and they are connected in series, the two fuse structures are respectively located on both sides of the drive coil, and the ends of the two fuse structures that are not connected in series are located in the chamber where the contact system is located, and are conductively connected to the static contact through the auxiliary contact assembly. The series conductive member between the ends of the two fuse structures connected in series is located in front of the displacement path when the moving iron core is opened, and a fuse disconnecting assembly is arranged between the series conductive member and the moving iron core. When the piston displacement pushes the moving contact and the moving iron core to move, the moving iron core can push the fuse disconnecting assembly to move and disconnect the series conductive member.

15. The excitation integrated contactor according to any one of claims 1 to 10, characterized in that: The distance between the impact end surface of the piston and the movable auxiliary contact is smaller than the distance between the impact end surface of the piston and the movable contact.

16. The excitation integrated contactor according to claim 15, characterized in that: The end surface of the piston impact end is provided with a groove, and the groove runs through both sides of the piston. The moving contact is arranged corresponding to the bottom of the groove, and the moving auxiliary contact is arranged corresponding to the end surfaces of the piston impact end on both sides of the groove; under normal working conditions, the moving contact does not contact the bottom of the groove.

17. The excitation integrated contactor according to claim 15, characterized in that: The groove of the piston is in a trumpet-shaped structure, and the moving contact passes through the open end of the trumpet-shaped structure of the piston and is located in the trumpet-shaped structure.

18. The excitation integrated contactor according to any one of claims 1 to 10, characterized in that: The fuse and the stationary contact are respectively electrically connected to the auxiliary contact assembly in a flexible connection manner.

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