Excitation integrated contactor with high breaking capacity

Abstract

The utility model relates to the field of circuit protection, in particular to an excitation integrated contactor with high breaking capacity, which comprises a driving system and a contact system, and further comprises an integrated excitation source, an excitation action assembly and an elastic piece, the elastic piece is arranged for one moving contact, one end of the elastic piece is fixed, the other end of the elastic piece is a free end, the excitation action assembly is fixedly connected with the free end of the elastic piece, the excitation source drives the excitation action assembly to move, the contact system is forcibly opened, and meanwhile, the elastic piece generates elastic deformation capable of restoring to the initial position; and the elastic piece, the moving contact and the excitation action assembly are all reset to initial positions during normal opening. The contactor has normal functions of the contactor and also has large current breaking and resetting functions, so that normal use of the contactor is ensured while the breaking range of the contactor is widened.

Description

Technical Field

[0001] The present invention relates to the field of circuit protection, and in particular to a contactor in circuit protection, and in particular to a contactor having the functions of forced opening by mechanical means and being able to restore the contact to normal opening and closing. 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 contactors are mainly responsible for the connection and disconnection of rated loads and currents below, and the fuses are mainly responsible for protective disconnection in overload and short-circuit conditions. However, due to the limited protection range of the fuse, the contactor sometimes also needs to disconnect a certain overload current; the contactor's ability to disconnect large currents is limited. When the fault current is too large, it will cause the contacts to weld or even explode.

[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 be disconnected 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 be separated, 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 cause ablation of the device, causing safety hazards; at the same time, the contactor cannot restore the normal contactor closing and opening function after the high current is disconnected. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an excitation integrated contactor with high breaking capacity. On the basis of the normal opening and closing of the contactor, large current breaking is achieved through excitation integration. At the same time, after the large current breaking, the normal opening and closing function of the contactor can be restored.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is an excitation integrated contactor with high breaking capacity, comprising: a contact system and a drive system, wherein the contact system and the drive system are respectively located in different chambers; the contact system comprises a moving contact assembly and a stationary contact, wherein the moving contact assembly comprises a moving contact and a moving contact spring, and the drive system comprises a moving guide rod, wherein the moving contact assembly is displaceably arranged on the moving guide rod; in a normal flow state, the excitation integrated contactor performs opening and closing under a normal working state;

[0006] The excitation integrated contactor further integrates: an excitation source, an elastic member and an excitation action component, wherein one end of the excitation source driving force release, the elastic member and the excitation action component are located in the chamber where the contact system is located; the excitation source can be actuated according to a trigger signal to release high-pressure gas as a driving force; the elastic member is a tubular structure, one end of the elastic member is a fixed end fixedly arranged relative to the housing of the excitation integrated contactor, and the other end of the elastic member is a free end;

[0007] The excitation action component is fixedly connected to the free end of the elastic member, and the excitation action component is arranged corresponding to the moving contact;

[0008] The driving force release end of the excitation source is arranged corresponding to the excitation action component, and a sealed cavity is formed between the excitation action component and the driving force release end of the excitation source, and the driving force released by the excitation source can pass through the elastic member to drive the free end of the elastic member to move along with the excitation action component toward the moving contact;

[0009] When the excitation integrated contactor is in normal working state, a gap is maintained between the excitation action component and the moving contact, and the excitation source does not act;

[0010] When an overload, short circuit current or abnormal situation occurs, the excitation source receives a trigger signal and releases high-pressure gas as a driving force, driving the free end of the elastic member to move toward the moving contact along with the excitation action component, and the excitation action component drives the moving contact to move, so that the contact system performs a large-break opening. At the same time, the elastic member produces a recoverable elastic deformation; when the arc is extinguished and the driving force is reduced, the elastic member drives the excitation action component to move toward the excitation source, break away from contact with the moving contact, and reset to the initial position, and the moving contact spring drives the moving contact to reset to the normal opening position.

[0011] Preferably, the recoverable elastic deformation of the elastic member is a tensile elastic deformation or a compressive elastic deformation formed by the displacement of the free end of the elastic member relative to the fixed end.

[0012] Preferably, when the recoverable elastic deformation of the elastic member is changed into a tensile elastic deformation, the fixed end of the elastic member is arranged toward the excitation source, and the free end of the elastic member is arranged toward the moving contact; the free end of the elastic member is closed by itself or by the excitation action component, so that a sealed cavity is formed between the end where the driving force of the excitation source is released and the free end of the elastic member; the driving force of the excitation source passes through the fixed end of the elastic member to drive the free end of the elastic member and the excitation action component to move toward the moving contact.

[0013] Preferably, when the recoverable elastic deformation of the elastic member is changed into a compressive elastic deformation, it also includes a connecting insert, which is a tubular structure and is sleeved in the elastic member; the end of the elastic member facing the moving contact is sealed and fixed relative to the shell of the excitation integrated contactor, and the end facing the excitation source is a free end, and the end of the insert facing the excitation source is sealed and fixedly connected to the free end of the elastic member, and the end of the insert facing the moving contact is fixedly connected to the excitation action component, and the end of the insert connected to the excitation action component is closed, so that a sealed cavity is formed between the excitation action component and the end of the excitation source driving force release; when an overload, short circuit current or abnormal situation occurs, the excitation source receives a trigger signal and acts, releasing high-pressure gas as a driving force, driving the free end of the elastic member and the insert to move toward the moving contact along with the excitation action component.

[0014] Preferably, when the restorable elastic deformation of the elastic member is changed into a compressive elastic deformation, the end of the elastic member facing the moving contact is fixedly arranged relative to the housing of the excitation integrated contactor, and the end facing the excitation source is a free end; a positioning spring, a gasket and a disc spring are sequentially arranged in the elastic member, the disc spring is located at the fixed end of the elastic member and supported by the fixed end, the positioning spring is located at the free end of the elastic member, and the disc spring supports the positioning spring through the gasket;

[0015] One end of the excitation action component is fixedly connected to the free end of the elastic member and closes the free end of the elastic member, and the other end of the excitation action component passes through the positioning spring, the gasket, the disc spring and the closed end of the elastic member in the elastic member and is arranged corresponding to the moving contact;

[0016] The end surface of the excitation action component located at the free end of the elastic member is arranged corresponding to the end where the excitation source driving force is released;

[0017] When an overload, short circuit current or abnormal situation occurs, the excitation source is activated to drive the excitation action component to cause the free end of the elastic member to move toward the moving contact. At the same time, the displacement of the excitation action component compresses the positioning spring and the disc spring.

[0018] Preferably, a groove with an eight-shaped structure that passes through both sides of the end face is provided on the end face of one end of the excitation action component facing the moving contact, and the two ends of the groove are respectively arranged corresponding to the moving contacts on both sides of the moving guide rod; when the moving contact is displaced for normal opening and closing, the moving contact is not in contact with the excitation action component, and when the excitation action component is displaced and drives the moving contact to displace, the end of the moving guide rod is located in the groove of the excitation action component.

[0019] Preferably, the chamber where the contact system is located and the chamber where the drive system is located are separated by a partition, and the chamber where the contact system is located is a sealed chamber, and the chamber where the contact system is located is filled with a gas arc extinguishing medium; a shell is provided on the periphery of the chamber where the contact system is located and the chamber where the drive system is located, and the driving force release end of the excitation source, the elastic member and the excitation action component are respectively located in the sealed chamber where the contact system is located.

[0020] Preferably, a sealing cover plate is provided on the partition to form a sealed chamber where the contact system is located; the static contact is inserted into the sealing cover plate and the outer shell; a guide cylinder connecting the inside and outside of the sealing cover plate is provided on the sealing cover plate between the two static contacts, and the elastic member is inserted into the guide cylinder, one end of the elastic member is fixedly connected to the end of the guide cylinder, and the other end is a free end.

[0021] Preferably, the guide cylinder located outside the sealing cover plate protrudes toward the outer shell, the mounting seats are respectively mounted on the static contact and the guide cylinder located between the sealing cover plate and the outer shell, the excitation source is installed on the mounting seat, the signal receiving end of the excitation source passes through the outer shell and is located outside the outer shell, and the driving force release end of the excitation source is located in the guide cylinder.

[0022] Preferably, a mounting boss protruding toward the shell is provided at the position of the mounting seat corresponding to the guide cylinder, a mounting hole penetrating the mounting seat is opened on the mounting boss, and a limiting step is provided in the mounting hole; the excitation source is installed in the mounting hole, the mounting hole is sleeved on the outer circumference of the guide cylinder, and the end face of the guide cylinder contacts with the limiting step of the mounting hole; the shell is passed through the mounting hole and the static contact to press and fix the mounting seat.

[0023] Preferably, an arc isolation plate is provided in the chamber where the contact system is located, and the arc isolation plate is located on a partition plate on the periphery of the moving contact.

[0024] Preferably, a limiting structure for limiting the displacement distance of the moving contact is provided on the arc isolation plate at a position corresponding to the moving contact.

[0025] The excitation integrated contactor with high breaking capacity of the present invention adopts a free end of an elastic member fixedly connected to an excitation action component, so that when the excitation action component drives the moving contact to forcibly open the switch, the elastic member undergoes elastic deformation that can be restored to an initial position, and when the arc is extinguished and the driving force is reduced, under the elastic force of the elastic member and the contact spring of the moving contact, the elastic member, the excitation action component and the moving contact can all be reset to the position when the switch is normally opened, thereby improving the breaking capacity of the contactor without affecting the normal opening and closing of the contactor.

[0026] Through excitation integration, the circuit breaker can be disconnected under high current of overload and short circuit, and the disconnection range of the contactor can be seamlessly connected to avoid the undesirable phenomenon of failure to disconnect in time at low overload current. The excitation and contactor can be reasonably coordinated to realize the high current disconnection of the contactor and improve the disconnection capacity and disconnection reliability.

[0027] By sealing the chamber where the contact system is located, the excitation source is arranged outside the chamber where the contact system is located, and the elastic part, the guide cylinder, and the excitation action component are sealed, so that the high-pressure gas released by the excitation source will not enter the chamber where the contact system is located. Before, after and after the excitation source is actuated, the gas pressure in the chamber where the contact system is located changes very little, and the impact of the high-pressure gas released by the excitation source on the various components in the chamber where the contact system is located is very small. Therefore, after the various components of the contactor are reset, it will not affect the normal opening and closing of the switch.

[0028] The chamber where the contact system is located is sealed and filled with arc extinguishing gas, so that when a large current is interrupted, the arc generated is extinguished by the arc extinguishing gas, thereby improving the arc extinguishing efficiency.

[0029] By setting a limit structure on the arc isolation plate, damage to the moving contact spring can be prevented when the switch is opened at a large break.

[0030] Through integrated technology, the overload breaking capacity of the contactor can be improved and the difficulty of current matching with the fuse can be reduced; and when the excitation element is actuated, the arc extinguishing system and electromagnetic system of the contactor will not be damaged, and the normal opening and closing of the contactor can continue to be achieved without the need for maintenance or replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional appearance schematic diagram of the present invention.

[0032] Figure 2 It is a schematic diagram of the explosion structure of the present invention.

[0033] Figure 3 yes Figure 1 Front view of .

[0034] Figure 4 yes Figure 3 The AA cross-sectional view is a schematic diagram of the contactor's normal open position structure.

[0035] Figure 5 yes Figure 3 The AA cross-sectional view is a schematic diagram of the contactor's normal closed position structure.

[0036] Figure 6 yes Figure 3 The AA cross-sectional view is a schematic diagram of the structure of the contact system's large-break opening position when the excitation action component is activated.

[0037] Figure 7 It is a schematic diagram of the partially enlarged structure of the installation position of the elastic part.

[0038] Figure 8 It is a schematic diagram of the structure in which an insert is provided in an elastic part.

[0039] Fig. 9 yes Figure 8 A partial enlarged view of .

[0040] Fig.10 It is a structural schematic diagram of arranging a positioning spring and a disc spring in an elastic member.

[0041] Reference numerals:

[0042] Housing 100, driving coil 11, moving iron core 12, static iron core 13, moving guide rod 14,

[0043] Moving contact 21, stationary contact 22, moving contact spring 23, sealing cover plate 31, guide cylinder 31a, arc isolation plate 32,

[0044] Excitation source 41 , mounting seat 42 , excitation action assembly 50 , push rod carrier 51 , push rod 52 , elastic member 60 , insert 61 , positioning spring 62 , disc spring 63 , piston 64 , gasket 65 . DETAILED DESCRIPTION

[0045] The excitation integrated contactor with high breaking capacity of the present invention comprises: a contact system and a drive system, wherein the contact system and the drive system are respectively located in different chambers; the contact system comprises a moving contact assembly and a stationary contact, wherein the moving contact assembly comprises a moving contact and a moving contact spring, and the drive system comprises a moving guide rod, wherein the moving contact assembly is displaceably arranged on the moving guide rod; in a normal flow state, the excitation integrated contactor performs opening and closing under a normal working state;

[0046] The excitation integrated contactor further integrates: an excitation source, an elastic member and an excitation action component, wherein one end of the excitation source driving force release, the elastic member and the excitation action component are located in the chamber where the contact system is located; the excitation source can be actuated according to a trigger signal to release high-pressure gas as a driving force; the elastic member is a tubular structure, one end of the elastic member is a fixed end fixedly arranged relative to the housing of the excitation integrated contactor, and the other end of the elastic member is a free end;

[0047] The excitation action component is fixedly connected to the free end of the elastic member, and the excitation action component is arranged corresponding to the moving contact;

[0048] The driving force release end of the excitation source is arranged corresponding to the excitation action component, and a sealed cavity is formed between the excitation action component and the driving force release end of the excitation source. The driving force released by the excitation source can pass through the elastic member to drive the free end of the elastic member to move toward the moving contact along with the excitation action component.

[0049] When the excitation integrated contactor is in normal working condition, there is a gap between the excitation action component and the moving contact, and the excitation source does not act;

[0050] When an overload, short circuit current or abnormal situation occurs, the excitation source receives the trigger signal and releases high-pressure gas as a driving force, driving the free end of the elastic member to move toward the moving contact along with the excitation action component. The excitation action component drives the moving contact to move, causing the contact system to open with a large break. At the same time, the elastic member produces a recoverable elastic deformation. When the arc is extinguished and the driving force is reduced, the elastic member drives the excitation action component to move toward the excitation source, disengages from the moving contact, and resets to the initial position. The moving contact spring drives the moving contact to reset to the normal opening position.

[0051] The recoverable elastic deformation of the elastic member refers to the elastic deformation of the elastic member being less than the maximum deformation of the elastic member.

[0052] The excitation source of the excitation ignition component of the present invention is a component that can release high-pressure gas as a driving force, such as a micro gas generator, which can react to a trigger signal (electrical signal, such as a voltage signal) and release a large amount of high-pressure gas as a driving force.

[0053] For the above technical solution, a preferred embodiment is now given to provide a specific description. For ease of understanding, the directional words involved in the following description are based on the directions shown in the accompanying drawings and do not constitute a limitation on the structure of the present invention.

[0054] See also Figures 1 to 7 The contactor includes a drive system and a contact system, which are respectively located in different chambers. The chamber where the drive system is located and the chamber where the contact system is located are separated by a partition, and a housing 100 is sleeved on the periphery of the chamber where the drive system and the contact system are located. Both the drive system and the contact system are existing contactor structures. The drive system and the contact system are briefly described below.

[0055] The driving system includes a driving coil 11, a moving iron core 12, a static iron core 13, a moving guide rod 14, and a reaction spring arranged in the chamber where the driving system is located. A magnetic tube is arranged in the driving coil 11, and a U-shaped yoke is arranged on the outside. The moving iron core 12 is displaceably arranged in the magnetic tube, the static iron core 13 is arranged at the partition, one end of the moving guide rod 14 is fixed on the moving iron core 12, and the other end passes through the partition and is located in the chamber where the contact system is located. A reaction spring is sleeved on the moving guide rod 14 between the moving iron core 12 and the partition.

[0056] A sealing cover plate 31 is arranged on the partition to form a sealed chamber, and the contact system is located in the sealed chamber formed by the sealing cover plate 31 and the partition. The sealed chamber where the contact system is located is filled with a gas arc extinguishing medium, such as an inert gas or nitrogen.

[0057] The contact system includes a moving contact 21, two stationary contacts 22, and a moving contact spring 23. The two stationary contacts 22 are spaced apart at the top of the sealing cover plate 31, one end of the stationary contact 22 is located outside the sealing cover plate 31 and passes through the top of the housing 100, and is located outside the housing 100, and the other end of the stationary contact 22 is located inside the sealing cover plate 31.

[0058] The outer periphery and end of the moving guide rod 14 in the sealing cover plate 31 are respectively provided with limiting structures, the moving contact 21 and the moving contact spring 23 are sequentially sleeved on the moving guide rod 14 between the limiting structures, and one end of the moving contact spring 23 contacts the moving contact 21. The moving contact spring 23 is in a compressed state.

[0059] An arc isolation plate 32 is arranged on the partition plate at the outer periphery of the moving contact 21, and a limiting structure is arranged on the arc isolation plate 32. The limiting structure is used to limit the displacement distance of the moving contact when the moving contact 21 is forced to be disconnected from the static contact, so as to prevent the moving contact spring from being damaged when the moving contact is disconnected with a large break.

[0060] When the driving coil 11 is energized, the static iron core 13 attracts the moving iron core 12, and the moving iron core 12 drives the moving guide rod 14 to move toward the static contact 22, so that the moving contact 21 and the static contact 22 are in conductive contact, and the contactor is normally closed;

[0061] When the driving coil 11 is de-energized, the moving iron core is driven to move away from the static iron core under the joint action of the moving contact spring 23 and the reaction spring, so that the moving contact and the static contact realize normal opening of the contactor.

[0062] The above is a brief description of the existing structure of the contactor. If there are any unfinished matters, please refer to the existing contactor structure.

[0063] In the chamber where the contact system of the contactor is located, an excitation source 41, an excitation action component 50, and an elastic member 60 are also integrated.

[0064] The excitation action assembly 50 includes a push rod carrier 51 and a push rod 52. The elastic member 60 is a bellows, preferably a bellows made of steel. In this embodiment, the bellows 60 is closed at one end and open at the other end. The open end of the bellows 60 is a fixed end, and the closed end is a free end. A flange structure for limiting position is provided at the fixed end of the bellows.

[0065] A guide cylinder 31a is provided on the top of the sealing cover plate 31 between the two static contacts 22, which communicates the inside and outside of the sealing cover plate 31, and one end of the guide cylinder protrudes outside the sealing cover plate 31. The elastic member 60 is sleeved in the guide cylinder 31a of the sealing cover plate 31, and the flange structure of the fixed end of the elastic member 60 is fixedly connected to the end of the guide cylinder located outside the sealing cover plate in a sealing manner, for example, by welding, and is sealed and connected to the end of the guide cylinder. The free end of the elastic member 60 passes through the guide cylinder and is located inside the sealing cover plate 31, and the excitation action component 50 is fixedly connected to the free end of the elastic member 60.

[0066] The mounting seat 42 is located outside the top of the sealing cover plate 31. A through hole is provided at the position of the static contact of the mounting seat 42, and a mounting boss is provided at the position of the guide cylinder of the sealing cover plate 31, and the mounting boss protrudes toward the housing. A mounting hole with two ends passing through is provided on the mounting boss corresponding to the guide cylinder, and a limited step is provided in the mounting hole. The through hole of the mounting seat 42 is sleeved on the outer periphery of the static contact 22 between the housing 100 and the sealing cover plate 31, and the mounting hole of the mounting seat 42 is sleeved on the outer periphery of the guide cylinder 31a at the top of the sealing cover plate 31, and the end face of the guide cylinder 31a is against the limited step of the mounting hole. The housing 100 passes through the static contact 22 and the mounting boss of the mounting seat 42, and the mounting seat 42 is pressed and fixed between the sealing cover plate 31 and the housing 100. The excitation source 41 is installed in the mounting hole of the mounting seat 42 and closes the mounting hole. The signal receiving end of the excitation source 41 passes through the shell 100 and is located outside the shell 100. The driving force releasing end is located in the elastic member 60. A sealed cavity is formed between the driving force releasing end of the excitation source 41 and the free end of the elastic member 60. When the excitation source 41 releases high-pressure gas, the high-pressure gas can completely act on the free end of the elastic member 60.

[0067] The excitation action assembly 50 is fixedly connected to the free end of the elastic member 60 and connected by welding. The excitation action assembly 50 includes a push rod carrier 51 and a push rod 52. In this embodiment, the push rod carrier 51 and the push rod 52 are integrally formed, and the preferred molding method is injection molding. The push rod carrier 51 is fixedly connected to the elastic member 60, and the push rod 52 is fixedly connected to the push rod carrier 51. The push rod 52 is made of insulating material. The end surface of the push rod 52 facing the moving contact 21 is provided with a groove that passes through the opposite sides of the push rod 52. The groove is in an eight-shaped structure, and the inner diameter of the opening end of the groove of the eight-shaped structure is greater than the width of the end of the moving guide rod 14 facing the static contact. The bottom of the groove of the eight-shaped structure of the push rod 52 is arranged opposite to the moving guide rod 14, and the groove of the eight-shaped structure of the push rod 52 faces the ends of the moving contact across the moving guide rod 14 and corresponds to the moving contacts on both sides of the moving guide rod 14. When the contactor is normally opened and closed, the moving contact 21, the moving guide rod 14 and the push rod 52 are not in contact, and the end of the moving guide rod 14 enters the groove of the push rod 52 for avoidance. When the push rod 52 contacts the moving contact 21, the two sides of the open end of the groove of the figure eight structure of the push rod 52 facing the moving contact direction contact the moving contacts on both sides of the moving guide rod 14 respectively, and push the moving contact to move relative to the moving guide rod 14, so as to realize the opening of the moving contact and the static contact.

[0068] Since the free end of the elastic member 60 is closed, a sealed cavity is formed between the excitation action assembly 50 and the end of the excitation source 41 where the driving force is released.

[0069] Working principle of the present invention:

[0070] In normal working state, the contactor performs opening and closing in normal working state, and the excitation source and excitation action components do not operate.

[0071] In case of overload, short circuit or abnormal condition:

[0072] The excitation source 41 receives the trigger signal and acts, releasing high-pressure gas as a driving force to drive the excitation action component to move, and the push rod 52 of the excitation action component drives the moving contact to move, so that the moving contact and the static contact are opened with a large break, and the large break opening position of the moving contact is limited by the upper limit limit structure of the arc isolation plate. When opening with a large break, the distance between the moving contact and the static contact is greater than the distance between the moving contact and the static contact during normal opening. During the opening process, when the excitation action component 50 is displaced, the elastic member 60 is stretched toward the moving contact, and an elastic deformation occurs that can be restored to the initial position;

[0073] When the moving and static contacts are forced to open with a large break, the arc is extinguished and the pressure of the high-pressure gas released by the excitation source gradually decreases to a certain level, and the driving force is less than the elastic force of the elastic part and the moving contact spring, the moving contact moves to the normal opening position under the combined action of the elastic force of the elastic part and the moving contact spring, and the excitation action component continues to move to the initial position under the action of the elastic force of the elastic part, thereby resetting each mechanism.

[0074] When maintenance and replacement are required, since the excitation source and the mounting seat are located outside the sealing cover, they will not affect the internal seal of the sealing cover and the installation of the elastic parts. Moreover, since the elastic parts are installed in a sealing manner, when the excitation source is actuated, the driving force released by the excitation source passes through the elastic parts and acts on the excitation action component. When the excitation source is actuated, it will not affect the internal structure of the sealed chamber formed by the sealing cover and the partition. Therefore, the mounting seat and the excitation source can be directly replaced to start the all-round protection of the circuit next time.

[0075] By integrating the excitation source, elastic parts and excitation action components, the breaking capacity of the contactor and the breaking capacity in response to abnormal situations are improved, thereby improving the response speed of the contactor.

[0076] The elastic deformation of the elastic member can be restored to the initial position, so that the displaced mechanisms can be restored to the initial position. Only the excitation action component needs to be replaced, which is convenient for maintenance and reduces maintenance costs.

[0077] In the above embodiment, one end of the bellows is open and the other end is closed. In other embodiments, the two ends of the bellows are connected, one end is a fixed end, fixedly connected to the housing of the excitation integrated contactor facing the excitation source, and the other end is a free end. The excitation action component is connected to the free end of the bellows by welding, and the free end of the bellows is closed by the excitation action component, so that a sealed cavity is formed between the excitation action component and the end where the excitation source driving force is released.

[0078] In the above embodiment, the bellows is directly fixedly connected to the excitation action component. Due to the elasticity of the bellows and the gravity of the excitation action component, the initial position of the excitation action component will change slightly during vibration. Of course, this change will not affect the normal opening and closing action and excitation action of the contactor.

[0079] In order to further improve the stability of the initial position of the excitation action component, the excitation action component is not directly connected to the bellows.

[0080] See also Figures 8 to 9, the two ends of the guide cylinder 31a protrude from the top outer surface and the top inner surface of the sealing cover plate 31 respectively. The elastic member 60, in this embodiment, is a corrugated tube with two ends through. The end of the elastic member 60 facing the excitation source is located in the guide cylinder 31a as a free end, and the end facing the moving contact 21 is fixedly connected to the end surface of the guide cylinder 31a located in the chamber where the contact system is located. A connecting insert 61 is sleeved in the elastic member 60, and its material can be metal or other materials. The insert 61 is a tubular structure, one end of which is sealed and fixedly connected to the free end of the elastic member 60 located in the guide cylinder 31a, and the other end is fixedly connected to the excitation action component 50. When the end of the insert 61 is connected to the free end of the elastic member 60, it is achieved by a circle of sealing connection between the tube wall end of the tubular insert 61 and the tube wall end of the elastic member 60. The sealing connection can be achieved by welding to ensure that the high-pressure gas released by the excitation source enters the hollow part of the insert 61, but does not enter between the insert and the elastic member.

[0081] The driving force release end of the excitation source 41 is located in the guide cylinder 31a. The connection between the insert 61 and the free end of the elastic member 60 is a sealed connection, such as a sealed connection achieved by welding, and the end of the insert 61 fixedly connected to the excitation action component 50 is closed, and the closing method can be that the end of the insert connected to the excitation action component 50 is closed itself, or through the excitation action component 50 connected thereto, so that the excitation action component 50 and the end of the excitation source driving force release form a sealed cavity.

[0082] In the initial position, the excitation action assembly 50 and the insert are supported by the bellows 60 .

[0083] When the driving force released by the excitation source 41 drives the excitation action component 50 to move, the excitation action component 50 drives the insert 61 to move, and drives the moving contact 21 and the static contact 22 to open the gate with a large break. When the excitation action component 50 drives the insert 61 to move, the insert 61 drives the free end of the bellows 60 to move along the inner wall of the guide tube 31a, compressing the bellows, so that the bellows undergoes elastic deformation that can be restored to the initial position;

[0084] When the moving and static contacts are forced to open, the arc is extinguished and the pressure of the high-pressure gas released by the excitation source gradually decreases to a certain level, and the driving force is less than the elastic force of the elastic part and the moving contact spring, the moving contact moves to the normal opening position under the joint action of the elastic force of the elastic part and the moving contact spring, and the excitation action component continues to move to the initial position under the action of the elastic force of the elastic part, thereby resetting each mechanism.

[0085] In the above embodiments, when the moving contact is driven, a limiting structure needs to be provided to limit the large-break opening position of the moving contact to prevent damage to the moving contact spring. In other embodiments, the limiting structure may not be provided. Figure 8 and Fig. 9 Redesign based on the principle of Fig.10 An elastic member 60 is arranged in the guide cylinder 31a integrally formed on the sealing cover plate 31, and the elastic member 60 is a bellows. A fixing plate 66 is fixed on the end face of the guide cylinder facing the moving contact, and the fixing plate 66 is used for bearing and fixing. One end of the elastic member 60 facing the moving contact is fixed on the fixing plate to form a fixed end, and the other end of the elastic member 60 facing the excitation source is a free end. In the elastic member 60, a positioning spring 62 and a disc spring 63 are arranged in sequence from the excitation source to the moving contact, and a gasket 65 is arranged between the positioning spring 62 and the disc spring 63. The disc spring 63 is located on the fixing plate 66, and the elastic member 60 and the disc spring 63 are supported by the fixing plate. When the disc spring 63 is compressed, the fixing plate is used to bear the elastic force of the disc spring 63 when it is compressed, and the disc spring 63 supports the positioning spring 62 through the gasket 65.

[0086] The excitation action assembly includes a piston 64 and a push rod 52. The piston 64 is inserted into the elastic member 60, and the piston head of the piston 64 is located at the free end of the elastic member 60 and is sealed and fixedly connected with the end of the free end of the elastic member 60. The free end of the elastic member 60 is closed by the piston head of the piston 64, and the sealed fixed relationship with the fixed end of the elastic member is matched, so that the high-pressure gas released by the excitation source will not enter the chamber where the contact system of the contactor is located when opening and closing, thereby ensuring that the gas inside the contactor will not be contaminated, and preventing the leakage of the gas inside the contactor. The sealed fixed relationship of the fixed end of the elastic member includes: the fixed end of the elastic member is sealed and fixedly connected to the inner wall surface or outer wall surface of the guide cylinder, or the fixed plate having a sealed and fixed connection relationship with the fixed end of the elastic member is sealed and fixedly connected to the inner wall surface or outer wall surface of the guide cylinder; when the fixed end of the elastic member or the fixed plate is sealed and fixed to the inner wall surface of the guide cylinder, the overall height of the product is smaller.

[0087] The piston head of piston 64 can be in slidable sealing contact with the inner wall of the guide tube or the inner wall of the mounting seat where the excitation source is installed, or it can be in clearance fit with the inner wall of the guide tube or the inner wall of the mounting seat where the excitation source is installed. When it is in sealing contact, it can be achieved by providing a sealing ring on the outer periphery of the piston head, so that the utilization rate of the high-pressure gas released by the excitation source is higher.

[0088] When a fixing plate is provided at the fixed end of the elastic member: the fixed end of the elastic member 60 can be sealingly fixedly connected to the end face of the guide tube facing the moving contact (the inner wall surface of the guide tube) or can be sealingly fixed to the end face of the guide tube facing the excitation source gas release end (the outer wall surface of the guide tube). The fixing plate is fixed to the fixed end of the elastic member and can be used to support the disc spring or other elastic elements provided in the elastic member. At this time, the fixing plate can also be sealingly fixed to the fixed end of the elastic member. Alternatively, the fixing plate 66 can be fixedly connected to the end face of the guide cylinder facing the moving contact (the inner wall of the guide cylinder) or the end face of the guide cylinder facing the end of the excitation source gas release (the outer wall of the guide cylinder), and the fixed end of the elastic member 60 is fixedly connected to the fixing plate 66 in a sealing manner, and while bearing the disc spring or other elastic elements inside the elastic member, the gas leakage between the fixing plate and the fixed end of the elastic member is prevented. At the same time, the sealing and fixing relationship between the piston head and the free end of the elastic member can separate the gas inside the contactor from the high-pressure gas released by the excitation source, and prevent the high-pressure gas released by the excitation source from entering the chamber where the contact system of the contactor is located when opening and closing, thereby contaminating the gas inside the contactor. The piston rod of the piston 64 passes through the positioning spring 62, the disc spring 63 and the fixing plate in the elastic member 60 and is fixedly connected to the push rod 52 located below the fixing plate. In the initial position, the piston and its push rod are supported and positioned by the common elastic force of the fixing plate 66, the positioning spring 62, the disc spring 63 and the elastic member 60. The piston head of the piston 64 is arranged corresponding to the driving force release end of the excitation source. Working principle:

[0089] In normal working state, the excitation source does not work and the contactor opens and closes normally.

[0090] In case of overload, short circuit or abnormal condition:

[0091] When the excitation source is activated, the driving piston 64 drives the push rod 52 to move so that the moving contact and the static contact are forced to open with a large break. In the process of the piston 64 driving the push rod 52 to move, the piston 64 drives the free end of the elastic member to move toward the fixed end to compress the elastic member. The piston 64 compresses the positioning spring 62. When the positioning spring 62 is compressed to a certain extent, the piston 64 drives the positioning spring 62 to continue to compress the disc spring 63. Since the disc spring 63 can provide a large reaction force under a smaller displacement, the piston 64 is rapidly decelerated until it stops under the reaction force of the disc spring 63. The moving contact also stops moving under the elastic force of the moving contact spring, thereby realizing a large break opening between the moving contact and the static contact. The opening distance between the moving contact and the static contact is determined according to the size of the reaction force provided to the piston.

[0092] When the gas pressure in the space formed by the excitation source and the piston is lower than the combined reaction force of the moving contact spring, elastic part, positioning spring and disc spring, under the combined action of the elastic force, the piston, push rod and elastic part return to their initial positions, and the moving contact returns to its initial position during normal opening under the action of the moving contact spring.

[0093] In this example, the position of the moving contact after forced opening can also be determined by setting a limit structure.

[0094] In the above embodiments, when the moving contact and the static contact are forced to open by the excitation source and the excitation action component, the moving contact can be displaced to the normal opening position or to the large-break opening position. Large-break opening position: the distance between the moving contact and the static contact is greater than the distance between the moving contact and the static contact in the normal opening position.

Claims

1. An excitation integrated contactor with high breaking capacity, characterized in that: include: A contact system and a drive system, wherein the contact system and the drive system are respectively located in different chambers; the contact system comprises a moving contact assembly and a stationary contact, the moving contact assembly comprises a moving contact and a moving contact spring, the drive system comprises a moving guide rod, and the moving contact assembly is displaceably arranged on the moving guide rod; in a normal flow state, the excitation integrated contactor performs opening and closing under a normal working state; The excitation integrated contactor further integrates: an excitation source, an elastic member and an excitation action component, wherein one end of the excitation source driving force release, the elastic member and the excitation action component are located in the chamber where the contact system is located; the excitation source can be actuated according to a trigger signal to release high-pressure gas as a driving force; the elastic member is a tubular structure, one end of the elastic member is a fixed end fixedly arranged relative to the housing of the excitation integrated contactor, and the other end of the elastic member is a free end; The excitation action component is fixedly connected to the free end of the elastic member, and the excitation action component is arranged corresponding to the moving contact; The driving force release end of the excitation source is arranged corresponding to the excitation action component, and a sealed cavity is formed between the excitation action component and the driving force release end of the excitation source, and the driving force released by the excitation source can pass through the elastic member to drive the free end of the elastic member to move along with the excitation action component toward the moving contact; When the excitation integrated contactor is in normal working state, a gap is maintained between the excitation action component and the moving contact, and the excitation source does not act; When an overload, short circuit current or abnormal situation occurs, the excitation source receives a trigger signal and releases high-pressure gas as a driving force, driving the free end of the elastic member to move toward the moving contact along with the excitation action component, and the excitation action component drives the moving contact to move, so that the contact system performs a large-break opening. At the same time, the elastic member produces a recoverable elastic deformation; when the arc is extinguished and the driving force is reduced, the elastic member drives the excitation action component to move toward the excitation source, break away from contact with the moving contact, and reset to the initial position, and the moving contact spring drives the moving contact to reset to the normal opening position.

2. The excitation integrated contactor with high breaking capacity according to claim 1, characterized in that: The recoverable elastic deformation of the elastic member is a tensile elastic deformation or a compressive elastic deformation formed by the displacement of the free end of the elastic member relative to the fixed end.

3. The excitation integrated contactor with high breaking capacity according to claim 2, characterized in that: When the recoverable elastic deformation of the elastic member is changed into a tensile elastic deformation, the fixed end of the elastic member is arranged toward the excitation source, and the free end of the elastic member is arranged toward the moving contact; the free end of the elastic member is closed by itself or by the excitation action component, so that a sealed cavity is formed between the end where the driving force of the excitation source is released and the free end of the elastic member; the driving force of the excitation source passes through the fixed end of the elastic member to drive the free end of the elastic member and the excitation action component to move toward the moving contact.

4. The excitation integrated contactor with high breaking capacity according to claim 2, characterized in that: When the recoverable elastic deformation of the elastic member is changed into compressive elastic deformation, it also includes a connecting insert, which is a tubular structure and is sleeved in the elastic member; the end of the elastic member facing the moving contact is sealed and fixed relative to the shell of the excitation integrated contactor, and the end facing the excitation source is a free end, and the end of the insert facing the excitation source is sealed and fixedly connected to the free end of the elastic member, and the end of the insert facing the moving contact is fixedly connected to the excitation action component, and the end of the insert connected to the excitation action component is closed, so that a sealed cavity is formed between the excitation action component and the end of the excitation source driving force release; when an overload, short circuit current or abnormal situation occurs, the excitation source receives a trigger signal and acts, releasing high-pressure gas as a driving force, driving the free end of the elastic member and the insert to move toward the moving contact along with the excitation action component.

5. The excitation integrated contactor with high breaking capacity according to claim 2, characterized in that: When the restorable elastic deformation of the elastic member changes into a compressive elastic deformation, the end of the elastic member facing the moving contact is fixedly arranged relative to the housing of the excitation integrated contactor, and the end facing the excitation source is a free end; a positioning spring, a gasket and a disc spring are sequentially arranged in the elastic member, the disc spring is located at the fixed end of the elastic member and supported by the fixed end, the positioning spring is located at the free end of the elastic member, and the disc spring supports the positioning spring through the gasket; One end of the excitation action component is fixedly connected to the free end of the elastic member and closes the free end of the elastic member, and the other end of the excitation action component passes through the positioning spring, the gasket, the disc spring and the closed end of the elastic member in the elastic member and is arranged corresponding to the moving contact; The end surface of the excitation action component located at the free end of the elastic member is arranged corresponding to the end where the excitation source driving force is released; When an overload, short circuit current or abnormal situation occurs, the excitation source is activated to drive the excitation action component to cause the free end of the elastic member to move toward the moving contact. At the same time, the displacement of the excitation action component compresses the positioning spring and the disc spring.

6. The excitation integrated contactor with high breaking capacity according to any one of claims 1 to 5, characterized in that: A groove with an eight-shaped structure that passes through both sides of the end face is provided on the end face of one end of the excitation action component facing the moving contact, and the two ends of the groove respectively correspond to the moving contacts on both sides of the moving guide rod; when the moving contact is displaced for normal opening and closing, the moving contact does not contact the excitation action component, and when the excitation action component is displaced and drives the moving contact to displace, the end of the moving guide rod is located in the groove of the excitation action component.

7. The excitation integrated contactor with high breaking capacity according to any one of claims 1 to 5, characterized in that: The chamber where the contact system is located and the chamber where the drive system is located are separated by a partition, and the chamber where the contact system is located is a sealed chamber, and the chamber where the contact system is located is filled with a gas arc extinguishing medium; a shell is arranged on the periphery of the chamber where the contact system is located and the chamber where the drive system is located, and the driving force release end of the excitation source, the elastic member and the excitation action component are respectively located in the sealed chamber where the contact system is located.

8. The excitation integrated contactor with high breaking capacity according to claim 7, characterized in that: A sealing cover plate is arranged on the partition to form a sealed chamber where the contact system is located; the static contact is arranged on the sealing cover plate and the outer shell; a guide cylinder connecting the inside and outside of the sealing cover plate is arranged on the sealing cover plate between the two static contacts, and the elastic member is arranged in the guide cylinder, one end of the elastic member is fixedly connected to the end of the guide cylinder, and the other end is a free end.

9. The excitation integrated contactor with high breaking capacity according to claim 8, characterized in that: The guide cylinder located outside the sealing cover plate protrudes toward the outer shell, and the mounting seats are respectively sleeved on the static contact and the guide cylinder located between the sealing cover plate and the outer shell. The excitation source is installed on the mounting seat, and the signal receiving end of the excitation source passes through the outer shell and is located outside the outer shell, and the driving force release end of the excitation source is located in the guide cylinder.

10. The excitation integrated contactor with high breaking capacity according to claim 9, characterized in that: A mounting boss protruding toward the shell is arranged at the position of the mounting seat corresponding to the guide cylinder, and a mounting hole penetrating the mounting seat is opened on the mounting boss, and a limiting step is arranged in the mounting hole; the excitation source is installed in the mounting hole, and the mounting hole is sleeved on the outer circumference of the guide cylinder, and the end face of the guide cylinder contacts with the limiting step of the mounting hole; the shell is passed through the mounting hole and the static contact to press and fix the mounting seat.

11. The excitation integrated contactor with high breaking capacity according to claim 8, characterized in that: An arc isolation plate is arranged in the chamber where the contact system is located, and the arc isolation plate is located on a partition plate on the periphery of the moving contact.

12. The excitation integrated contactor with high breaking capacity according to claim 11, characterized in that: A limiting structure for limiting the displacement distance of the moving contact is arranged on the arc isolation plate at a position corresponding to the moving contact.

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