WO2010139186A1

WO2010139186A1 - Quick trip breaker with function of pneumatic actuation trip

Info

Publication number: WO2010139186A1
Application number: PCT/CN2010/000707
Authority: WO
Inventors: 敖登贵; 韦尚靖
Original assignee: 上海诺雅克电气有限公司
Priority date: 2009-06-05
Filing date: 2010-05-19
Publication date: 2010-12-09
Also published as: CN101604601A; CN101604601B

Abstract

A quick trip breaker with the function of pneumatic actuation trip, which comprises a plurality of single-stage breaking units (36) and an operation mechanism (1) with a shared trip rod (17).Each of the single-stage breaking units comprises a shell (35), a contact device (45), an arc extinction device (25), a wiring device (55), an over-current trip device and a pneumatic trip device consisting of actuation mechanisms (2) and transmission mechanisms (3). One single-stage breaking unit is provided with one or two sets of transmission mechanisms in coupled connection with a piston (16) of the actuation mechanisms of the single-stage breaking unit, so the transmission mechanisms can be shared by two adjacent breaking units, and the trip action of the actuation mechanisms of the two adjacent breaking units can be transmitted to the shared trip rod of the operation mechanism through a contact arm (11). One single-stage breaking unit is provided with one or two sets of actuation mechanisms which can transmit the trip action of the stage breaking unit to the transmission mechanism on the connection side synchronously.

Description

Quick trip circuit breaker with pneumatic actuation tripping function

Technical field

The present invention relates to a quick trip circuit breaker having a pneumatically actuated trip function, and more particularly to an improved circuit breaker for achieving a fast trip trip by means of a high voltage gas energy formed by a contact breaking short circuit current.

Background technique

With the development of the power industry and the transformation of urban and rural power grids, the development of intelligent buildings, rural urbanization, and industrial automation control in cities has put forward higher technical requirements for circuit breakers in China. Modification, modularity, multi-function, modular attachment, high breaking, low noise, reliable operation, and progressive realization of the "demanding direction", the most basic of which is to improve the reliability of the circuit breaker. Considering the current state of design, specifications and performance of circuit breakers in China, the current situation of inadequate and inadequate applications, users in the actual engineering applications of a variety of low-voltage electrical appliances, there are inevitably some unreasonable deviation, for this, more Circuit breaker products are required to work hard to improve their reliability at the time of manufacture.

The closing and opening action of the circuit breaker contacts is accomplished by the cooperation of the electric gas and the mechanical mechanism. In the mechanical mechanism, the free tripping mechanism is the key to realize the connection between the transmission mechanism and the contact system. When the free trip mechanism is locked, the transmission mechanism can move the contact system together under the external force of the trip unit to close the moving and static contacts. When tripping, the external force collides with the tripping shaft, causing it to rotate through an angle, so that the lock is released, the transmission mechanism is disengaged from the contact system, and the dynamic and static contacts are separated and disconnected under the action of the main spring. As is known, in the power supply and distribution lines, the prior art single-pole or multi-pole circuit breakers have certain protection, such as an overcurrent tripping tripping device, and the tripping device used mainly has the short circuit protection for the circuit. Trip unit and thermal trip unit for overload protection. Circuit breaker overload or short circuit protection is usually performed by a trip unit, but under certain operating conditions, especially when the short circuit current is large, use conventional off The buckle method utilizes the spring operating mechanism of the circuit breaker to open the contact. This method takes too long. At present, people have begun to use the high-pressure gas energy tripping formed by the contact breaking short-circuit current to realize the quick trip tripping of the circuit breaker. Performance requirements.

The invention patent No. ZL92111503.2 discloses a circuit breaker that utilizes the over-pressure actuation tripping principle to quickly trip, uses a gas chamber to collect the high-pressure gas formed by the contact breaking short-circuit current, pushes the piston and drives the rod to strike the buckle. , the four-bar linkage of the circuit breaker operating mechanism is disintegrated to achieve the purpose of rapid breaking of the circuit breaker. The utility model is characterized in that: a spacer is arranged between two single-pole breaking devices; a pneumatic actuating device is arranged on the separating member; and the pneumatic actuating device comprises a cavity, a gas and a piston in the cylinder. The structure and design of the prior art spacers and actuators are complex and inconvenient to manufacture and assemble.

The invention patent No. ZL03145501.8 discloses a circuit breaker which simplifies the above-mentioned air pressure actuating structure, and is characterized by solving the problem that the breaking protection ability of the prior art is easy to be saturated and the breaking grade is difficult to be improved, and the feature is: An opening flange is disposed on the contact device, the opening flange is in communication with a space for generating a high-pressure gas; a rotating shaft is disposed at a corresponding portion of the base, and the rotating shaft has a configuration opposite to the opening flange The force member receives the overpressure airflow escaping from the opening flange of the contact device, and transmits a rotational force through the rotating shaft to drive the actuating member to quickly break the circuit breaker. The solution proposed by this patent solves the problem of rapid tripping and further optimizes the structure, but it also has assembly and manufacturing drawbacks. ''

The circuit breaker is divided into a single-pole circuit breaker or a multi-pole circuit breaker according to the type of power equipment or the needs of the power distribution circuit, and the multi-pole circuit breaker is further divided into a two-pole circuit breaker, a three-pole circuit breaker, a four-pole circuit breaker, and the like. specification. With the development of technology to solve the versatility of components between circuit breakers of different pole numbers, one can assemble a plurality of standard single-pole breaking unit assemblies into one multi-pole circuit breaker, but currently multi-pole circuit breakers are manufactured at the factory. The assembly has been completed before, and it is hoped that the assembly of the circuit breaker will facilitate the maintenance of the site. However, the above two prior art pneumatic tripping mechanisms cannot be applied to the maintenance of the circuit breaker at the use site of the circuit breaker. Taking the invention patent of ZL03145501.8 as an example, the rotating shaft of the tripping device of the tripping device is set at On the base, and the force receiving member on the rotating shaft is opposite to the flange on the contact device, the touch member on the rotating shaft is opposite to the lock of the operating system, and the action of the actuating member touches the locking device to disengage the circuit breaker buckle. This relatively configured mounting mechanism requires high precision parts and is required to be completed during the production commissioning process of the multi-pole circuit breaker. Once this debugging is completed, disassembly is not allowed. A change in the assembly position between the flange on the contact device and the force receiving member on the rotating shaft may cause a malfunction of the tripping action of the rotating shaft. Although the pneumatic tripping method is an effective means to improve the breaking capacity and the tripping speed of the circuit breaker, the tripping tripping system of the prior art circuit breaker can be installed in combination to simultaneously satisfy the simultaneous breaking of the plurality of single-pole breaking units. / Closed, and can meet the high assembly reliability requirements that must be met by the cooperative work of multiple single-pole breaking units. Design improvements must be made to existing mechanisms.

Summary of the invention

The object of the present invention is to overcome the defects of the prior art and provide a quick trip circuit breaker which optimizes the air pressure actuation tripping function, and has the advantages of high reliability, easy manufacture and assembly, simple structure, fast tripping speed, and the like, and Its air pressure tripping mechanism can be applied to the assembly requirements of multi-pole circuit breakers.

In order to achieve the above object, the present invention adopts the following technical solutions.

A quick trip circuit breaker having a pneumatic actuation tripping function, comprising: an operating mechanism 1, a base and a cover for controlling at least one standard single pole breaking unit 36 to perform an on/off task by a common trip lever 17 The number of the single-pole breaking units 36 is equal to the number of poles of the circuit breaker; each of the single-pole breaking units 36 includes a housing 35, a contact device 45, an arc extinguishing device 25, a first wiring device, and a first Two wiring devices 55 and electromagnetic trip devices. The contact device 45 includes a bridge movable contact '32 with double break points, a first fixed contact 190 and a second fixed contact 230, and the lost contact 32 is mounted on the contact support 33. The contact support 33 is directly coupled to the operating mechanism 1, and the first stationary contact 190 and the second stationary contact 230 are respectively connected to the first wiring device and the second wiring device 55. The arc extinguishing device 25 includes an arc extinguishing chamber 20 formed by the casing 35 in the vicinity of the contact device 45 and an arc chute 24 installed in the arc extinguishing chamber 20.

The single pole breaking unit 36 further includes a pneumatic trip device composed of the actuating mechanism 2 and the transmission mechanism 3. The actuating mechanism 2 is disposed on the single-pole breaking unit 36, and includes a cavity 201 disposed in the housing 35 and communicating with the arc extinguishing chamber 20, and matching the inner cavity 201. And a piston 16 that is movable along the axis of the inner chamber 201. The transmission mechanism 3 is disposed on the single-pole breaking unit 36, and includes a first supporting lug 29, a second supporting lug 27, a transmission rod 10 and a return spring 18, and the transmission rod 10 is pivotally mounted On the first support lug 29 and the second support lug 27 as described. The lower portion of the transmission rod 10 is provided with a first transmission structure 15 and a second transmission structure 14, wherein the first transmission The movable structure 15 is coupled to the piston 16 of the actuating mechanism 2 of the single pole breaking unit 36, and the second transmission structure 14 is for providing actuation on another adjacent single pole breaking unit of the circuit breaker. The piston coupling of the mechanism is connected. The upper part of the transmission rod 10 is provided with a contact arm 1 1 coupled to the common trip lever 17 of the operating mechanism 1. When the circuit breaker is subjected to a large current impact, the movable contact 32 is subjected to an electric repulsion function, and simultaneously The first stationary contact 190 and the second stationary contact 230 are disengaged and generate a large amount of energy, so that the air pressure in the space having the arc extinguishing chamber 20 is rapidly increased, and the high pressure gas pushes the piston 16 to make the first transmission structure 15 and/or The second transmission structure 14 rotates about the axis of the transmission rod 10, and simultaneously drives the contact arm 11 to rotate, and triggers the common trip rod 17 to generate a tripping action, triggering the operating mechanism 1 to control each single-pole breaking unit of the circuit breaker and simultaneously realize the breaking trip. .

The transmission rod 10 is composed of a rod body 13, a first journal 131, a second journal 132, and a first transmission structure.

15. The second transmission structure 14 and the contact arm 11 are integrally formed; or the transmission rod 10 is composed of a rod body 13, a first journal 131, a second journal 132, a first transmission structure 15, a second transmission structure 14, The contact arms 11' are formed separately in different combinations. The diameters of the first journal 131 and the second journal 132 are both smaller than the diameter of the rod body 13, so that the rod body 13 forms two joints with the first journal 131 and the second journal 132, respectively. The first journal 131 is pivotally mounted with the bearing hole on the first support lug 29 on the single pole breaking unit 36, and the second journal 132 and the second on the single pole breaking unit 36 The bearing holes on the support lugs 27 are pivotally mounted; the end faces of the two shoulders are respectively associated with the end faces of the bearing holes on the first support lugs 29 and the bearing holes on the second support lugs 27 The end faces are slidably engaged to constrain the axial movement of the transmission rod 10.

The first support lug 29 and the second support lug 27 are disposed on a side wall of the housing 35 of the single-pole breaking unit 36; the side wall is adjacent to one of the adjacent single-pole breaking units The side is such that the second transmission structure 14 mounted on the transmission rod 10 on the first support lug 29 and the second support lug 27 can be coupled to the actuation mechanism on the adjacent single pole breaking unit. The first transmission structure 15 and the second transmission structure 14 are respectively block-shaped protrusions having a diameter smaller than the diameter of the piston 16, and the end faces of the block-shaped protrusions are spherical surfaces.

One end of the return spring 18 is connected to the transmission rod 10, and the other end is connected to the housing 35 of the single-pole breaking unit 36; the spring force of the return spring 18 acts away from the contact arm 11 on the transmission rod 10 The direction of the common trip lever 17 of the operating mechanism 1 is the same. The return spring 18 is twisted One of a spring, a tension spring, or a compression spring.

The outer side surface of the second supporting lug 27 is provided with a through groove 271 penetrating the bearing hole on the second supporting lug 27; the width thereof is smaller than the diameter of the second journal 132 on the transmission rod 10; When the external force is expanded, the through groove 271 is elastically deformed to expand and widen, so that the second journal 132 can be inserted into or removed from the bearing hole through the through groove 271.

The first support lug 29, the second support lug 27 and the housing 35 of the single pole breaking unit 36 are integrally formed; or one of the first or second support lugs 29 or 27 The housing 35 is formed in one piece and the other is a separate component mounted on the housing 35. Or the housing 35 of the first support lug 29, the second support lug 27, and the single pole breaking unit 36 are three separate independent components, and the first support lug 29 and the second support lug 27 respectively The mounting is fixed to the housing 35. The mounting and fixing manner is one of bonding, riveting, screwing or snapping.

An actuating mechanism 2 is disposed on a side wall of the casing 35 of the single-pole breaking unit 36; or symmetrically mounted on both side walls of the casing 35 of the single-pole breaking unit 36. Two sets of actuation mechanisms 2.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partial schematic view of an embodiment of a quick trip circuit breaker having a pneumatically actuated trip function of the present invention.

Figure 2 is a cross-sectional view taken along line A-A of the embodiment of Figure 1.

Figure 3 is a schematic illustration of the drive rod components of the quick trip circuit breaker having the pneumatically actuated trip function of the present invention.

Figure 4 is a schematic illustration of the pneumatic actuation mechanism of the fast trip circuit breaker of the present invention having a pneumatically actuated trip function.

detailed description

An embodiment of the quick trip circuit breaker of the present invention having a pneumatically actuated trip function will now be described in detail with reference to Figures 1-4. The circuit breaker of the present invention is not limited to the specific description of the following embodiments. An embodiment of the fast jump circuit breaker of the present invention having a pneumatically actuated trip function as shown in FIG. 1 is a three-pole circuit breaker composed of three standard single-pole breaking units 36. Obviously, the number of the single-pole breaking units 36 can be selectively combined according to the user's requirements on the number of poles of the circuit breaker. The circuit breaker of the present invention comprises an operating mechanism 1, a base (not shown) and a cover (not shown), and the operating mechanism 1, the base and the cover can support the assembly of different numbers within a certain range. The single pole breaking unit 36, if optional, is assembled into a pole circuit breaker, or a two pole circuit breaker, or a three pole circuit breaker (Fig. 1), or a four pole circuit breaker.

The operating mechanism 1 of the circuit breaker of the present invention is a common component for controlling a plurality of single-pole breaking units 36 to perform on/off tasks in synchronization. The so-called on/off task refers to the on/off task of the main circuit between the input terminal and the output terminal of the single-pole breaking unit 36. As shown in FIG. 1 or 2, the single-pole breaking unit 36 is a standard independent unit, and includes a housing 35, an arc extinguishing device 25, a contact device 45, and an overcurrent trip device (not shown in the figure). ), a first wiring device (not shown) and a second wiring device 55. The contact device 45 includes a bridge movable contact 32 having a first movable contact 21 and a second movable contact 22, a first stationary contact 190, and a second stationary contact 230. The first movable contact 21 and the second movable contact 22 are symmetrically disposed at two ends of the movable contact 32. The movable contact 32 is mounted on the contact support 33, and the contact support 33 is directly connected to the operating mechanism 1. The coupling is coupled to cause the movable contact 32 to perform a breaking/closing operation under the control of the operating mechanism 1. a first stationary contact 19 is disposed on the first stationary contact 190, and a second stationary contact 23 is disposed on the second stationary contact 230. When the movable contact 32 performs a breaking/closing operation, the The movable contact 21 and the second movable contact 22 are respectively separated/closed in synchronization with the first stationary contact 19 and the second stationary contact 23, respectively. The first stationary contact 190 and the second stationary contact 230 are coupled to a first wiring device (not shown) and a second wiring device 55, respectively. Generally, the contact device 45 can be set to one or more according to the needs of the user's one-pole or multi-pole circuit breaker, and FIG. 1 is a three-pole circuit breaker. The arc extinguishing devices 25 are respectively disposed near the contacts, and include an arc extinguishing chamber 20 formed by the casing 35 of the single pole breaking unit 36 and a arc extinguishing grid 24 installed in the arc extinguishing chamber 20.

The pneumatic trip device of the present invention is shown in Figures 1, 2 and 4, and the single pole breaking unit 36 further comprises a pneumatic trip device consisting of the actuating mechanism 2 and the transmission mechanism 3. The actuating mechanism 2 includes a cavity 201 disposed in the housing 35 of the single-pole breaking unit 36 and communicating with the arc extinguishing chamber 20, and matching with the inner cavity 201 and capable of being internal The piston 16 of the axis of the cavity 201 moves. The transmission The mechanism 3 includes a first support lug 29 formed on the single pole breaking unit 36, a second support lug 27 formed on the single pole breaking unit 36, a transmission rod 10 and a return spring 18. The transmission rod 10 is pivotally mounted on the first support & ear 29 and the second support lug 27.

The structure of the transmission mechanism of the air pressure actuating device of the circuit breaker of the present invention and its mechanical connection relationship with the actuating mechanism will be further explained below. As shown in FIGS. 1 to 4, the transmission rod 10 is a rod-shaped member, and the transmission rod 10 is composed of the rod body 13, the first journal 131, the second journal 132, the first transmission structure 15, and the second The transmission structure 14 and the contact arm 11 are integrally formed. Specifically, the middle portion of the transmission rod 10 is a rod body 13 having a first journal portion 131 and a second journal portion 132 at both ends thereof, and a first transmission structure 15 and a second transmission structure are disposed at a lower portion of the rod body 13. 14. A contact arm 11 and a spring hole 12 are provided in an upper portion of the second journal 132. The first transmission structure 15 at the lower portion of the transmission cymbal 10 is coupled to the piston 16 of the actuation mechanism 2 of the single-pole breaking unit 36, and the second transmission structure 14 is used to provide another circuit breaker A piston coupling connection of an actuation mechanism of an adjacent single pole breaking unit.

As described above, a preferred embodiment of the present invention is as shown in FIGS. 1, 3 and 4. The transmission rod 10 is composed of a rod body 13, a first journal 131, a second journal 132, a first transmission structure 15, and a The two transmission structures 14 and the contact arms 11 are integrally formed. Another alternative to the preferred embodiment is that the transmission rod 10 is composed of a rod body 13, a first journal 131, a second journal 132, a first transmission structure 15, a second transmission structure 14, and a contact arm 11. Formed separately in different combinations, for example: the contact arm 11 is formed separately from the shaft 13 , the first transmission structure 15 and/or the second transmission structure 14 are formed separately, and then the separately formed elements are fixedly connected. It is clear that the preferred embodiment of the one-piece forming has the advantage of a structural unit than the split-formed solution.

The diameters of the first journal 131 and the second journal 132 are smaller than the diameter of the rod 13 so that the joint between the first journal 131 and the rod 13 is at the second journal 132 and the shaft 13 The joint portions respectively form a shoulder, and the end faces of the two shoulders are respectively slidably engaged with the end faces of the bearing holes on the first support lug 29 and the second support lug 27 to constrain the shaft of the transmission rod 10 To the movement. The first journal 131 is pivotally mounted with a bearing hole on the first support lug 29 on the single pole breaking unit 36, and the second journal 132 and the second support on the single pole breaking unit 36 The bearing bores on the lugs 27 are pivotally mounted to constrain the radial movement of the drive rod 10, thereby constraining the drive rod 10 mounted to the first support lug 29 and the second support lug 27 to rotate only motion. The first support lug 29 and the second support lug 27 are formed in the same housing 35 of the single-pole breaking unit 36. On one side wall, the side wall is a side wall adjacent to one side of the adjacent single-pole breaking unit, thereby ensuring that the second transmission structure 14 on the transmission rod 10 can be connected to the adjacent single-pole breaking unit The actuation mechanism implements a coupling connection.

A through groove 271 is formed on the outer side surface of the second support lug 27. The through groove 271 and the bearing hole on the second supporting lug 27 are completely penetrated, and the width of the through groove 271 is smaller than the diameter of the second journal 132 on the transmission rod 10 to ensure the second journal 132 is in the bearing. The hole cannot be freely removed. The width of the through groove 271 refers to the width of the through groove 271 in the radial direction of the bearing hole on the second support lug 27, and the width can be generated when the through groove 271 is subjected to an external force expanding in the width direction. The elastic deformation is expanded and widened to facilitate the second journal 132 on the transmission rod 10 to be inserted into or removed from the bearing hole through the through groove 271. A preferred method for generating the expansion external force is: when the transmission rod 10 is mounted, the second journal 132 is pushed into the through groove 271 until the through groove 271 is deformed by pressure, and the first The second journal 132 enters the bearing hole; when the transmission rod 10 is removed, the second shaft force 132 is pulled outward from the through groove 271 until the through groove 271 is deformed by pressure, and the second The journal 132 is disengaged from the through groove 271.

One end of the return spring 18 is connected to the spring hole 12 of the transmission rod 10, and the other end is connected to the mounting groove 26 of the casing 35 of the single-pole breaking unit 36, and the elastic force of the return spring 18 acts on the transmission rod 10. The contact arms 11 are in the same direction away from the common trip lever 17 of the operating mechanism 1, so that in the process in which the contact arm 11 of the transmission lever 10 touches the common trip lever 17 of the operating mechanism 1 to trip the circuit breaker, The return spring 18 stores energy, so that the force transmitted by the actuating mechanism 2 to the transmission rod 10 requires the elastic force of the return spring 18 to trigger the tripping trip of the circuit breaker; when the air pressure in the actuating mechanism 2 returns to normal At this time, the elastic force of the return spring 18 automatically drives the transmission rod 10 and the piston 16 of the actuating mechanism back to the initial position, or the elastic force of the return spring 18 causes the actuating mechanism 2 and the transmission mechanism 3 to return to the initial state, that is, the open circuit The state before the trip. The reset spring 18 of the embodiment shown in Fig. 1 is a torsion spring, and it is not difficult to imagine that the return spring 18 may be one of a tension spring or a compression spring.

As shown in Figures 3 and 4, the first transmission structure 15 and the second transmission structure 14 on the transmission rod 10 are in the form of block projections. The diameter of the block projections should be smaller than the diameter of the piston 16 to ensure that the block projections can extend into the inner cavity 201 to be coupled to the piston 16. The end surface of the block-shaped protrusion is a spherical surface to ensure that the end face of the block-shaped protrusion is in contact with the end surface of the piston 16 during the rotation of the transmission rod 10 keep stable.

In the embodiment shown in FIG. 1, two sets of transmission mechanisms 3 are respectively disposed on the two side walls of the housing 35 of the single-pole breaking unit 36, that is, two first supporting lugs 29 are respectively formed on the single pole. On both side walls of the housing 35 of the breaking unit 36, two second supporting lugs 27 are formed on the two side walls of the housing 35 of the single pole breaking unit 36, respectively, so that two of the single pole breaking units 36 Two transmission mechanisms 3 can be symmetrically fitted on the side wall. The advantage of this symmetrical arrangement is that the assembly process can be completed, so that the force-receiving members can be consistently applied to the left and right. Another alternative is to provide only one set of transmission mechanisms on a single pole breaking unit 36, i.e., a first support lug 29 and a second support lug 27 are formed in the housing 35 of the single pole breaking unit 36. On one side wall, it has the advantage of facilitating the uniform production of the single-pole breaking unit 36, that is, a multi-pole circuit breaker requires only one identical standard single-pole breaking unit 36 to meet the requirements of the combined assembly.

1 and 4 show a preferred embodiment in which the first support lug 29 and the second support lug 27 are formed on the side wall of the outer casing 35 of the single pole breaking unit 36, i.e., the first support lug 29 and The second support lug 27 is integrally formed with the outer casing 35 of the single-pole breaking unit 36, and has the advantages of simple structure, easy installation, and ease of manufacture. An alternative is of course: the first support lug 29 and/or the second support lug 27 are mounted in the form of separate elements on the side wall of the outer casing 35 of the single-pole breaking unit 36, which is fixedly mounted. The form may be one of bonding, riveting, screwing or snapping, which has the advantage that the hanging first support lugs 29 and/or the second support lugs 27 can be removed at any time.

In the embodiment shown in Fig. 1, two sets of actuating mechanisms 2 are provided on the single pole breaking unit 36. It is apparent that the set of actuating mechanisms on the outer side of the single-sided disconnecting unit 36 on the far side of the multi-pole circuit breaker is emptied (i.e., not used). This facilitates the uniform production of the single-pole breaking unit 36, that is, a multi-pole circuit breaker requires only one identical standard single-pole breaking unit 36 to meet the combined assembly requirements. Obviously, another alternative is that the single-pole breaking unit 36 is provided with only one set of actuating mechanisms 2, which has the advantage of overcoming the outermost actuating mechanism of the single-pole breaking unit on the far side of the multi-pole circuit breaker. The problem of hanging up, but the actuating mechanism 2 is either disposed on the left side of the single pole breaking unit 36 or on the right side of the single pole breaking 36.

The present invention selectively combines adjacent single pole breaking units 36, and when selected to have adjacent single pole breaking units, the second transmission structure 14 and the piston of the adjacent single pole breaking unit Coupling connection; when the selection is not assembled with an adjacent single-pole breaking unit, the second transmission structure 14 Hanging, that is, no coupling connection with other components occurs. The transmission mechanism 3 is disposed on the single pole breaking unit 36 and the second transmission structure 14 is used to provide a coupling connection with the piston of the adjacent single pole breaking unit, so that the plurality of single pole breaking units can be selectively assembled into a plurality of A multi-pole circuit breaker is required. The upper contact arm 11 of the transmission rod 10 is coupled to the common trip lever 17 of the operating mechanism 1. When the single-pole breaking unit 36 and/or the adjacent single-pole breaking unit are subjected to a large current impact, the movable contact 32 is subjected to the electric repulsive force while being disengaged from the first fixed contact 190 and the second fixed contact 230. A large amount of energy is generated, most of which is absorbed by the arc extinguishing chamber 20, and a large amount of gas is released, which rapidly raises the air pressure in the space having the arc extinguishing chamber 20, which pushes the piston 16 to make the first transmission structure 15 and / or the second transmission structure 14 rotates about the axis of the transmission rod 10, and simultaneously drives the rod body 13 and the contact arm 11 to rotate, and the rotation of the contact arm 11 touches the common trip rod 17 to generate a tripping action, thereby triggering the operating mechanism 1 to issue a tripping action And control each single-pole breaking unit to achieve the breaking trip at the same time. Such a breaking principle is often shorter than the time of tripping by the electromagnetic trip device, which can maximize the breaking capacity of the circuit breaker. The invention solves the trouble that the background technology must be debugged according to the actual installation position of the contact device when installing the rotating shaft, and not only the two force receiving members on the rotating shaft can ensure the sensing on the two contact devices at the same time. The components are well connected, and the number of poles of the circuit breaker is required to maintain, test and overhaul the isolation of the power system, and can be assembled without restriction. It can be seen that the circuit breaker of the present invention not only has a tubular assembly, but also makes the operation more reliable, and can significantly save the manufacturing cost, the circulation sales cost, and the user use cost of the product compared with the conventional circuit breaker which cannot be combined.

Claims

Claim

1. A fast if mega-gate breaker with a pneumatically actuated trip function, which includes:

An operating mechanism (1), a base and a cover for controlling at least one standard single-pole breaking unit (36) to perform an on/off task by a common trip cymbal (17);

The number of the single pole breaking units (36) is equal to the number of poles of the circuit breaker;

Each of the single-pole breaking units (36) includes a housing (35), a contact device (45), an arc extinguishing device (25), a first wiring device, a second wiring device (55), and an electromagnetic trip device. ;

The contact device (45) includes a bridge movable contact (32) with double break points, a first stationary contact (190) and a second stationary contact (230), the movable contact ( 32) mounted on the contact support (33), the contact support (33) is directly coupled to the operating mechanism (1), and the first stationary contact (190) and the second stationary contact (230) are respectively connected to the first connection The device and the second wiring device (55) are connected;

The arc extinguishing device (25) comprises an arc extinguishing chamber (20) formed by the casing (35) near the contact device (45) and an arc chute installed in the arc extinguishing chamber (20) ( twenty four);

It is characterized by:

The single pole breaking unit (36) further includes a pneumatic tripping device composed of an actuating mechanism (2) and a transmission mechanism (3);

The actuating mechanism (2) is disposed on the single-pole breaking unit (36), and includes a cavity (201) disposed in the casing (35) and communicating with the arc extinguishing chamber (20) a piston (16) that matches the inner cavity (201) and is movable along the axis of the inner cavity (201);

The transmission mechanism (3) is disposed on the single-pole breaking unit (36), and includes a first supporting lug (29), a second supporting lug (27), a transmission rod (10) and a return spring ( 18), the transmission rod (10) is pivotally mounted on the first support lug (29) and the second support lug (27); the lower portion of the transmission rod (10) is provided with a a transmission structure (15) and a second transmission structure (14), wherein the first transmission structure (15) is coupled to the piston (16) of the actuation mechanism (2) of the single-pole breaking unit (36), a second transmission structure (14) for providing another adjacent to the circuit breaker a piston coupling connection of an actuating mechanism on the single pole breaking unit;

The upper part of the transmission rod (10) is provided with a contact arm (11) coupled to the common trip lever (17) of the operating mechanism (1). When the circuit breaker is subjected to a large current impact, the movable contact (32) Being subjected to an electric repulsion, simultaneously repelling with the first stationary contact (190) and the second stationary contact (230) and generating a large amount of energy, so that the air pressure in the space having the arc extinguishing chamber (20) is rapidly increased. The high pressure gas pushes the piston (16) to rotate the first transmission structure (15) and/or the second transmission structure (14) about the axis of the transmission rod (10), and simultaneously drives the contact arm (11) to rotate, and touches the shared off The buckle (17) generates a tripping action, and the triggering operation mechanism (1) controls each single-pole breaking unit of the circuit breaker to simultaneously realize the breaking trip.

2. A quick trip circuit breaker with a pneumatically actuated trip function according to claim 1 wherein:

The transmission rod (10) is composed of a rod body (13), a first journal (131), a second journal (132), a first transmission structure (15), a second transmission structure (14), and an arm (11). ) integrated;

The diameters of the first journal (131) and the second journal (132) are smaller than the diameter of the rod body (13), so that the rod body (13) is respectively opposite to the first journal (131), the second The joint between the journals (132) forms two shoulders;

The first journal (131) is pivotally mounted with a bearing hole on the first support lug (29) on the single pole breaking unit (36), and the second journal (132) and the single pole breaking unit ( 36) The bearing hole on the second support lug (27) is pivotally mounted;

The end faces of the two shoulders are respectively slidably engaged with the end faces of the bearing holes on the first support lugs (29) and the end faces of the bearing holes on the second support lugs (27) to constrain the drive rod (10) Axial motion.

The quick trip circuit breaker with air pressure actuating trip function according to claim 1, characterized in that: the transmission rod (10) is composed of a rod body (13), a first journal (131), The two journals (132), the first transmission structure (15), the second transmission structure (14), and the contact arms (11) are separately formed in different combinations.

4. A quick trip circuit breaker having a pneumatically actuated trip function according to claim 1 The first support lug (29) and the second support lug (27) are disposed on a side wall of the casing (35) of the single-pole breaking unit (36); Adjacent to one side of the adjacent single pole breaking unit, so that the second transmission structure (14) mounted on the transmission cymbal (10) on the first supporting lug (29) and the second supporting lug (27) can It is coupled to an actuation mechanism on an adjacent single pole breaking unit.

5. The quick trip circuit breaker with pneumatic actuation trip function according to claim 1 wherein:

The return spring (18) has one end connected to the transmission rod (10) and the other end connected to the housing (35) of the single-pole breaking unit (36);

The elastic force acting direction of the return spring (18) is consistent with the direction of the common tripping lever (17) of the operating mechanism (1) of the operating mechanism (1) on the transmission lever (10);

The return spring (18) is one of a torsion spring, a tension spring or a compression spring.

6. A quick trip circuit breaker with a pneumatically actuated trip function according to claim 1, 2 or 4, characterized in that:

The outer side surface of the second supporting lug (27) is provided with a through groove (271);

The through groove (271) penetrates with a bearing hole on the second supporting lug (27);

The width of the through groove (271) is smaller than the diameter of the second journal (132) on the transmission rod (10); when the through groove (271) is expanded by an external force, elastic deformation can be generated to expand and widen, so that The second journal (132) can be inserted into or removed from the bearing bore through the through slot (271).

The quick trip circuit breaker with pneumatic actuation trip function according to claim 1 or 4, characterized in that: the first support lug (29), the second support lug (27) and the single The housing (35) of the pole breaking unit (36) is formed in a body; or one of the first supporting lug (29) or the second supporting lug (27) and the housing (35) are The body is formed while the other is a separate component mounted on the housing (35). The mounting is fixed by one of bonding, riveting, screwing or snapping.

8. A quick trip circuit breaker having a pneumatically actuated trip function according to claim 1 or 4, wherein:

The first supporting lug (29), the second supporting lug (27), and the housing (35) of the single-pole breaking unit (36) are three separate independent components, and the first supporting lug (29) And the second supporting lugs (27) are respectively mounted and fixed on the casing (35), and the mounting and fixing manner is one of bonding, riveting, screwing or snapping.

9. The quick trip circuit breaker with pneumatically actuated trip function according to claim 1, wherein: a set of sidewalls of the housing (35) of the single pole breaking unit (36) is provided The actuating mechanism (2); or two sets of actuating mechanisms (2) are symmetrically mounted on the two side walls of the housing (35) of the single-pole breaking unit (36).

10 . The quick trip circuit breaker with pneumatic actuation trip function according to claim 1 , wherein: the first transmission structure ( 15 ) and the second transmission structure ( 14 ) are respectively smaller than the diameter. A block-shaped projection of a diameter of the piston (16), and the end face of the block-shaped projection is a spherical surface.