WO2010139185A1 - 带辅助支撑件的多极断路器 - Google Patents

带辅助支撑件的多极断路器 Download PDF

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Publication number
WO2010139185A1
WO2010139185A1 PCT/CN2010/000706 CN2010000706W WO2010139185A1 WO 2010139185 A1 WO2010139185 A1 WO 2010139185A1 CN 2010000706 W CN2010000706 W CN 2010000706W WO 2010139185 A1 WO2010139185 A1 WO 2010139185A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
contact
rotary shaft
bearing
pole
Prior art date
Application number
PCT/CN2010/000706
Other languages
English (en)
French (fr)
Inventor
敖登贵
韦尚靖
Original Assignee
上海诺雅克电气有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海诺雅克电气有限公司 filed Critical 上海诺雅克电气有限公司
Priority to EP10782889.9A priority Critical patent/EP2439762B1/en
Priority to KR1020117024560A priority patent/KR101242709B1/ko
Priority to US13/321,473 priority patent/US8664550B2/en
Publication of WO2010139185A1 publication Critical patent/WO2010139185A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1009—Interconnected mechanisms
    • H01H71/1027—Interconnected mechanisms comprising a bidirectional connecting member actuated by the opening movement of one pole to trip a neighbour pole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H2003/326—Driving mechanisms, i.e. for transmitting driving force to the contacts using bearings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H2009/0094—Details of rotatable shafts which are subdivided; details of the coupling means thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1009—Interconnected mechanisms
    • H01H2071/1036—Interconnected mechanisms having provisions for four or more poles

Definitions

  • the present invention relates to a low voltage circuit breaker, and more particularly to an auxiliary support structure suitable for a double breakpoint multipole breaker rotary shaft assembly.
  • the low-voltage circuit breaker is a low-voltage electric appliance with a protection function for performing on/off between the input end and the load end of the main circuit, and at least includes a contact system for performing an on/off task of the main circuit, and the control contact system is executed.
  • a shut-off operating mechanism a wiring device for connecting the circuit breaker to the input and load terminals of the main circuit, a housing for mounting the operating mechanism, the contact system and the wiring device, the contact system further comprising a moving contact
  • the static contact and the contact support, and the movable contact is mounted on the contact support and performs the closing/breaking of the fixed contact with the action supported by the contact.
  • the contacts are connected to the operating mechanism and operate with the control of the operating mechanism.
  • the contact system is divided into two types: double breakpoint or single breakpoint.
  • the double-breakpoint contact system has two serially connected moving contacts and two static contacts connected to the input end of the main circuit and the load end, and the single-breakpoint contact system has only one moving contact per stage and A static contact.
  • the contact system of a single-pole circuit breaker has only one set of moving contacts and static contacts, while the multi-pole circuit breaker has multiple sets of moving contacts, static contacts, moving contacts, sets of static contacts and circuit breakers. The number of poles is equal.
  • EP0314540 discloses a technical solution of a single-pole circuit breaker, characterized in that: the contact is supported as a rotary shaft; the movable contact having two movable contacts is mounted on the rotary shaft by a spring; Midpoint and rotary axis The axes are coincident so that the movement trajectories of the two movable contacts remain symmetrical; the contact pressure of the two movable contacts with the stationary contacts is provided by the spring to improve the contact pressure of the two sets of contacts of the single-pole circuit breaker The problem of uneven distribution.
  • the drawbacks of the EP0314540 patent are: The rotational accuracy of the rotary shaft is poor; the stability application of the rotary shaft system in a multi-stage circuit breaker system is not considered.
  • the rotary shaft In the multi-pole contact system, the rotary shaft extends for a long time. When the rotary shaft rotates, it will produce a significant torsion phenomenon due to its force, which makes the moving contact away from the central circuit breaker move later, which greatly deepens the contact of each level. The problem of uneven pressure.
  • the contact system of each pole of the multi-pole circuit breaker needs to be installed and isolated in the independent arc extinguishing chamber due to the arc extinguishing requirement, the rotary shafts with the plurality of sets of moving contacts need to pass through the partition walls of the respective arc extinguishing chambers.
  • the invention patent No. 200710151603.1 provides a technical solution different from the present invention, characterized in that: the rotary shaft assembly is composed of a plurality of contact supports, a rotary shaft and a rolling bearing through which the rotary shaft assembly passes the rolling bearing and the multipole A bearing housing and a bearing cover on the partition wall in the circuit breaker housing are mounted.
  • This solution can improve the motion accuracy and motion flexibility of the rotary shaft assembly, but it has the following two limitations: First, because this solution relies only on the partition wall to stabilize the rotary shaft, it requires the cooperation of the bearing cover. The stable installation of the rotary shaft assembly can be supported on the partition wall of the circuit breaker, so the installation accuracy is not ideal, the debugging is complicated, and the production efficiency is affected.
  • Multi-level circuit breakers consisting of multiple independent split single-pole circuit breakers can only be applied to multi-stage circuit breakers with a single-piece housing, ie single-pole circuit breakers separated by partition walls.
  • Multi-pole circuit breakers consisting of independent split single-pole breaking units help to optimize industrial production efficiency and reduce production costs. Since each single-pole breaking unit can be used for multi-pole circuit breakers with different pole numbers, only one strip is used. A different number of circuit breakers can be produced in a production line, a set of molds, and a single component. However, each independent split single-pole breaking unit needs to be controlled by the same operating mechanism to perform the on/off operation and the tripping trip action, which brings new problems to the support and drive structure design of the rotary shaft.
  • the invention relates to a circuit breaker with an auxiliary support member, which is designed to overcome the unreasonable support of the rotary shaft of the multi-pole circuit breaker of the prior art, and the dynamic contact and static caused by the obvious twisting phenomenon of the rotary shaft.
  • the contact pressure of the contact is not balanced, and the operation driving force and the trip driving force are large due to the unreasonable design of the rotary shaft assembly, the rotation of the rotary shaft is inflexible, the trip speed is slow, the manufacturing difficulty is high, and the production cost is high.
  • the invention adopts a technical scheme of supporting the operating mechanism on the support rod of the rotary shaft system, and providing a stable supporting force to the rotary shaft directly and multi-point by the support rod and the auxiliary support member, thereby ensuring the movement supported by the contact.
  • the stability enhances the balance of the contact pressure of each contact, and has a simple structure, greatly improving the intrinsic performance of the product, such as breaking capacity, reliability, safety, etc., and prolonging the service life of the product.
  • the present invention employs the following technical solutions:
  • a multi-pole circuit breaker with an auxiliary support comprising a base, N single-pole breaking units, an operating mechanism for controlling the split/break operation of each single-pole breaking unit, and a common single-pole breaking unit Rotary shaft assembly.
  • the single-pole breaking unit comprises: a housing, an arc extinguishing chamber, two static contacts symmetrically distributed, two symmetrically distributed arc extinguishing grids, and two wiring devices respectively connected to the stationary contacts.
  • the rotary shaft assembly is assembled by N-1 support assemblies and N contacts, and each support assembly is provided with one contact support on each side, and each contact support is provided with one The bridge type double break point moving contact, the moving contact supports the link through the spring on the same.
  • the operating mechanism is directly connected to the rotary shaft assembly to directly drive the N movable contacts supported by the respective contacts and the static contact of the single-pole breaking units to perform synchronous breaking/closing operations.
  • the support assembly is composed of a rotary shaft, an auxiliary support member, a bearing of the auxiliary support member and at least one support rod; a shaft hole is disposed at a shaft center position supported by the contact, and the rotary shaft is inserted into the support through the shaft hole Within the contact support on both sides of the assembly, the rotary shaft and the contact support maintain a synchronous rotation.
  • a bearing hole is disposed on the auxiliary support member, and an outer side of the bearing is tightly assembled with a bearing hole of the auxiliary support member, and an inner side of the bearing is tightly assembled with the rotary shaft, and the tight assembly refers to a stable connection relationship. When the circuit breaker is in motion, tight assembly does not cause misalignment or relative displacement between the outer side of the bearing and the auxiliary support, between the inner side of the bearing and the rotary shaft.
  • the bearing in the technical solution of the present invention may be a rolling bearing or a sliding bearing.
  • the bearing is a rolling bearing
  • the rotating shaft is installed in an interference fit with the inner ring of the rolling bearing
  • the outer casing of the rolling bearing is mounted in an interference fit with the bearing hole on the auxiliary support.
  • the outer ring and the inner ring of the bearing are guided by the cage of the bearing and drive the rolling elements to roll on the correct raceway.
  • the bearing is a sliding bearing
  • the bearing bush of the sliding bearing is formed on the auxiliary support; and the journal is formed on the rotary shaft.
  • At least one support rod mounting hole is disposed on the auxiliary support member, the support rod is closely fitted with the support rod mounting hole, the support rod is placed parallel to the rotary shaft, and each support assembly shares a support rod.
  • the operating mechanism is also fixedly coupled to the rotary shaft assembly via a support rod that is mounted and fixed to the housing of the single pole breaking unit and provides a stable supporting force for the rotating shaft through the auxiliary support members.
  • the advantage of this type of support system is that the support rod provides support for the operating system, and also provides support for the rotating shaft directly through the auxiliary supports at all levels, and also transmits the support force of the housing.
  • a new support system can greatly reduce the torsion of the distal contact.
  • the present invention also adopts the following technical solution: the rotary shaft is provided with at least one outer plane near the position supported by the contact, and the contact is supported at the contact At least one inner plane is disposed in the shaft hole, and the outer plane and the inner plane are in close contact with each other, and the matching work is performed one by one so that the rotary shaft and the shaft hole are not misaligned due to the moment load.
  • the operating mechanism mounted on the rotary shaft assembly is supported by the control link drive contact.
  • An operating mechanism control hole is disposed on the contact support, the operating mechanism extends out of the control operating arm, and the control operating arm is directly connected to the operating mechanism control hole supported by the contact to complete the operating mechanism to support the contact Direct drive control.
  • the angle ⁇ formed by the center of the rotation axis between the adjacent two support rods is preferably between 60 and 120 degrees.
  • the design of the present invention can be flexibly applied to circuit breakers of various housing types, and the housing of the single-pole breaking unit and the base of the multi-pole circuit breaker can be an integrally formed component; or the component Or each of the housings of the single pole breaking unit is an integrally formed component that is formed separately from the base of the multi-pole circuit breaker.
  • Figure 1 is a perspective view showing a partial structure of a specific embodiment of a three-stage circuit breaker with an auxiliary support of the present invention
  • Figure 2 is a cross-sectional view along the line A-A of the single-pole circuit breaker shown in Figure 1.
  • Figure 3 is a partial illustration of one embodiment of a four-stage circuit breaker with an auxiliary support of the present invention, and more particularly to a structural schematic view of a rotary shaft assembly.
  • Figure 4 is a schematic illustration of the construction of an embodiment of a support assembly for a multi-stage circuit breaker with an auxiliary support of the present invention.
  • Figure 5 is a schematic view showing the structure of the contact support of the circuit breaker with an auxiliary support of the present invention.
  • Figure 6 is a schematic view showing the construction of a circuit breaker-assisted auxiliary support member with an auxiliary support of the present invention.
  • the pole number N of the circuit breaker can be determined to be 2 poles, 3 poles or 4 grades according to the production requirements. As shown in Fig. 1, a partial structure perspective view of the 3-pole circuit breaker is shown, wherein the third pole only shows a part of the structure.
  • the multi-level circuit breaker includes: a plurality of single-pole breaking units 1 , the number of the single-pole breaking units 1 is equal to the number of poles N of the circuit breaker, as shown in FIG. 1 , N is 3; Not shown), the plurality of single-pole breaking units 1 are all mounted on the base; an operating mechanism 102 for controlling the N single-pole breaking units to perform the split/break operation; and one by N
  • the rotary shaft assembly 100 shared by the single pole breaking unit.
  • each of the single-pole breaking units 1 includes the following components: an arc extinguishing chamber 2 formed by a casing 24 of the single-pole breaking unit; two static contacts symmetrically distributed with respect to the axis of the rotating shaft a first static contact 29 and a second static contact 33 as shown in FIG. 2; two arc extinguishing gates symmetrically distributed with respect to the axis of the rotating shaft, the first arc chute as shown in FIG. 36 and the second arc chute 37; the two wiring devices are respectively connected to the two static contacts, and the connecting device 4 as shown is one of the wiring devices, and the other wiring device is not shown.
  • the housings 24 of each of the single-pole breaking units 1 are each a separate body-shaped component that assembles the housings 24 of a plurality of separate split single-pole circuit breaker units into a single base.
  • the housing 24 of the single-pole breaking unit needs to be connected in series through the connecting plate 38 into a housing assembly and fixedly connected to the base of the multi-pole circuit breaker.
  • the connecting plate 38 is disposed on the housing 24 of the single pole circuit breaker having a threaded slot through which the housing 24 can be screwed to the base.
  • the invention is also applicable to a plurality of single-pole breaking units in which the housing is integrally formed, for example: the housing 24 of each single-pole circuit breaker is integrally formed with the base of the multi-pole circuit breaker, in which case the single-pole circuit breaker
  • the arc extinguishing chamber is actually composed of a dividing wall in the outer casing of the multi-pole circuit breaker.
  • the rotary shaft assembly is well solved for the multi-pole circuit breaker in which the casing 24 is an independent split structure, and is suitable for the casing. 24 is a technical problem of a multi-pole circuit breaker with a monolithic structure.
  • FIG. 1 and 3 illustrate a particular embodiment of a rotary shaft assembly 100.
  • the rotary shaft assembly 100 of a 4-pole circuit breaker of Fig. 3 is assembled by N-1 (i.e., three) support assemblies 101 and N (i.e., four) contacts supporting 12 series.
  • the support assembly 101 is not only a connector for the N contact supports 12 assembled in series, but also provides a supporting force for the rotary shaft assembly 100.
  • the support assembly 101 supports two shared contacts for a common support assembly that abuts the end of the contact support 12 and thus provides excellent support.
  • the rotary shaft assembly 100 also has the shape of an elongated shaft
  • the support structure composed of the plurality of support assemblies 101 greatly enhances the rigidity of the rotary shaft assembly 100, eliminating the bending deformation thereof, and making the movable contact and the static contact
  • the contact pressure between the points is very balanced, and the rotation of the rotary shaft assembly 100 is very flexible.
  • the contact support 12 is provided with a through shaft hole 121, a through contact slot 122 perpendicular to the shaft hole 121, and at least one operating mechanism control hole 123, at least one spring mounting portion 125:
  • the rotary shaft 17 is connected to the contact support 12 on both sides of the support assembly 101 through the shaft hole 121, and the shaft hole 121 has an interference fit with the rotary shaft 17 (shown in FIG. 4) to ensure the rotary shaft 17 and the touch
  • the head supports 12 synchronous rotation; the contact slot 122 is for accommodating the mounting moving contact 40 (shown in FIG.
  • the operating mechanism control hole 123 is for directly connecting the operating mechanism 102 to each contact support 12, so that the contact supports 12 The most direct control of the operating mechanism 102 is obtained;
  • the spring hole 125 is for mounting a spring 39 (shown in Figure 2) for mounting the moving contact 40 to the contact support 12 and the moving contact 40 with the contact Supported rotation and rotation.
  • Each of the contact supports 12 of the rotary shaft assembly 100 is provided with a movable contact 40 (shown in FIG. 2), and the first static contact of each movable contact 40 with each single-pole breaking unit 1 (shown in FIG. 1) The head 29 (shown in FIG. 2) and the second stationary contact 33 (shown in FIG.
  • FIG. 2 The control connection relationship between the operating mechanism 102 and the contact support 12 of each stage is shown in FIG. 2 and FIG.
  • An operating mechanism control hole 123 is provided on the contact support 12, and a control operating arm 32 extending from the operating mechanism 102 is directly connected to the operating mechanism control hole 123 of the contact support 12 at the control operating arm 32.
  • the control operating arm 32 of the operating mechanism 102 When the operating mechanism 102 is in operation, the control operating arm 32 of the operating mechanism 102 directly drives the contact support 12 to rotate about the axis of the rotary shaft 17, thereby driving the movable contact 40 mounted in the contact support 12 to rotate synchronously, so that the operation is performed.
  • the movable contacts on the rotary shaft assembly 100 are respectively synchronized and disconnected with the static contacts of the single-pole breaking units, thereby ensuring the dynamic contact and static of the multi-pole circuit breaker. Synchronization of the break/close of the contacts.
  • the structure of the rotary shaft assembly 100 of the present invention is not only applicable to a multi-pole circuit breaker in which the outer casing is a separate structure, but also to a multi-pole circuit breaker in which the outer casing is a unitary structure.
  • the multi-pole circuit breaker with an auxiliary support of the present invention employs a bridge type double break point moving contact.
  • the first movable contact 41 and the second movable contact 35 are provided at both ends of the movable contact 40.
  • the first movable contact 41 and the second movable contact 35 are arranged symmetrically with respect to the rotational axis of the rotary shaft 100.
  • the first movable contact 41 cooperates with the first stationary contact 28 to realize the closing/disconnecting operation of the circuit breaker
  • the second movable contact 35 cooperates with the second stationary contact 34 to realize the circuit breaker closing/disconnecting operation.
  • the first movable contact 41 and the second movable contact 35 are arranged in point symmetry, when the rotary cymbal assembly 100 is rotated by an operating angle about the axis of the rotary shaft 17, the first movable contact 41 and the second movement are driven.
  • the contact 35 is closed/disconnected to realize the on/off operation of the main circuit of the single pole breaking unit.
  • the movable contact 40 is mounted to the contact slot 122 (see FIG. 5) on the contact support 12 by a spring 39.
  • the contact pressure is used to improve the contact reliability; the contact pressure of the first movable contact 41 and the contact pressure of the second movable contact 35 can be equalized; and the overtravel action of the movable contact can be alleviated
  • the impact force brought by the moving and static contacts The first static contact 29 and the second static contact 33 are each provided with a U-shaped structure, which can make the current direction of the moving contact and the static contact in the vicinity of the contact reverse to a large current (overload or short circuit) In the case of current), an electromagnetic repulsion is automatically generated between the movable contact and the fixed contact, thereby Improve the ability to break.
  • the spring 39 is a two tension springs.
  • the number of the springs 39 may be one, because the movable contact 40 can also be mounted on the contact support 12 by using one spring, and the elastic contact between the movable contact and the fixed contact can also be formed. pressure. However, if two springs are arranged in a symmetrical form, the contact pressure of the first movable contact 41 and the contact pressure of the second movable contact 35 can be made more balanced.
  • the spring 39 can also be a torsion spring, that is to say, the torsion spring and the tension spring are actually the same embodiment which can be replaced with each other.
  • the support assembly 101 is composed of a rotary shaft 17, a bearing 16 of the auxiliary support member 15, an auxiliary support member 15, and a support rod 25.
  • the auxiliary support member 101 is provided with a bearing hole 153 for mounting a bearing, and at least one support rod mounting hole 151 for connecting the support rod 25.
  • the bearing 16 is mounted in a bearing hole 153 of the auxiliary support member 101, and may be one of a rolling bearing or a sliding bearing, and the rotary shaft 17 is mounted in the bearing 16.
  • the rotary shaft 17 is tightly fitted to the auxiliary support member 101 by the bearing 16, and the support force of the auxiliary support member 101 is obtained while maintaining the flexibility of the rotary shaft 17 to rotate.
  • One contact support 12 is connected to each side of the rotary shaft 17.
  • an outer plane 171 parallel to the axis of rotation is provided on the shaft head of the rotary shaft 17 near the both ends of the contact holder 12, an outer plane 171 parallel to the axis of rotation is provided; and a side of the contact support 12 is provided for mounting the rotary shaft 17
  • the shaft hole 121 is provided with an inner plane 124 parallel to the center line of the shaft hole 121.
  • the number and shape of the inner plane 124 and the outer plane on the rotary shaft 17 are matched with each other.
  • the outer plane 171 and the inner plane 124 are in close contact with each other to ensure that the rotary shaft 17 and the contact support 12 are synchronously rotated about the axis of the rotary shaft 17.
  • the engagement between the shaft head on the rotary shaft 17 and the shaft hole 121 of the contact support 12 is an interference fit, but it is ensured that the shaft head and the shaft hole 121 are smoothly mounted by means of a tool. Due to the interference fit between the shaft head and the shaft hole 121, the close fit between the outer plane 171 on the shaft head and the inner plane 124 of the shaft hole 121, the rotary shaft 17 and the contact support 12 are ensured. No looseness or good position, no matter what kind of load (such as impact load, moment load) the rotary shaft 17 and the contact support 12 are, there is no hidden trouble of looseness or misalignment.
  • At least one outer plane 171 is provided on the shaft ends at both ends of the rotary shaft 17, and at least one inner plane 124 is provided on the contact support 12, and the inner plane 124 and the outer plane 171 are The number and positional relationship should match. Obviously, when the number of the inner plane 124 and the outer plane 171 is increased, the manufacturing difficulty is increased, but the technical effect of the misalignment prevention can be improved.
  • the bearing 16, shown in Figures 3 and 4 is a rolling bearing 16.
  • the rolling bearing 16 includes four inner elements of an inner ring of the inner side of the bearing 161, an outer ring of the outer side of the bearing 162, a rolling body (not shown) between the inner and outer rings, and a retainer (not shown).
  • the outer ring 162 of the rolling bearing 16 is mounted in the bearing hole 153 of the auxiliary support member 15, and the two are closely fitted to each other. In order to prevent the outer ring and the bearing hole 153 from loosening, an interference fit should be used between the outer ring and the bearing hole 153, but it should be ensured that the tool can be assembled smoothly.
  • the inner ring 161 of the rolling bearing 16 is mounted on the rotary shaft 17, and the two are closely fitted to each other.
  • bearing 16 is a plain bearing.
  • the plain bearing comprises two basic elements: the journal of the inner side 161 of the bearing and the bearing bush of the outer side 162 of the bearing.
  • the journal of the sliding bearing is formed on the supported rotary shaft 17, and the two may be integrally formed or separately assembled; the plain bearing bush is formed on the auxiliary support 15 of the support bearing, and the two may be One-piece molding can also be assembled separately.
  • a technical solution which is preferably recommended by the present invention under the sliding bearing scheme is: the bearing bush of the sliding bearing is formed on the auxiliary support member 15 and integrally formed with the bearing hole 153 on the auxiliary support member 15;
  • the journal is formed at the intermediate portion of the rotary shaft 17, and the sliding friction is achieved by the lubricant between the journal of the bearing inner side 161 and the bearing shell of the bearing outer side 162.
  • the auxiliary support member 15 is provided with a bearing hole 153; when the rolling bearing is used, the bearing hole 153 is interference-fitted with the outer ring of the rolling bearing hole; when the sliding bearing is used, the bearing hole 153 directly slides with the rotary shaft 17 Cooperate to slide the support to the rotary shaft 17.
  • the journal when the rolling bearing is used, the journal is over-engaged with the inner ring of the rolling bearing 16; when the sliding bearing is used, the journal and the bearing hole of the auxiliary support 15 are used.
  • 153 (shown in Figure 6) Slip fit.
  • the auxiliary support member 15 must support the rotary shaft 17 through the bearing, so the rotary shaft 17 must be fitted with the bearing, and the bearing must be fitted with the auxiliary support member 15;
  • the above-mentioned cooperative relationship between the rotary shaft 17, the rolling bearing 16 and the auxiliary support 15 is well understood; when the sliding bearing is used, due to the sliding bearing, two components with sliding support surfaces (set in the back)
  • the journal on the rotating shaft 17 and the bearing bush disposed on the auxiliary supporting member 15 are respectively formed on the rotary shaft 17 and the auxiliary support member 15, so that the above-mentioned rotary shaft, the sliding bearing and the auxiliary support member 15 are fitted together.
  • the system has formed a special case.
  • the fitting form of the rotary shaft 17 and the journal of the sliding bearing is integrally formed; the fitting mounting form between the bearing bush of the sliding bearing and the auxiliary support 15 is integrally formed.
  • the mating between the bearing bush of the sliding bearing and the auxiliary support 15 is a two-part component that is separately assembled on the rotary shaft 17 and the auxiliary support 15 respectively. It is obvious that the structure of this embodiment is more complicated than the above-described integrally formed structure, and the basic technical effects are the same.
  • the support assembly 101 of the present invention preferably employs a rolling bearing or a sliding bearing.
  • At least one support rod mounting hole 151 is provided on the auxiliary support member 15.
  • the support rod mounting hole 151 is configured to be tightly coupled with the support rod 25, thereby mounting and fixing the auxiliary support member 15 on the base 24 of the single pole breaking unit or the base (not shown) of the multi-pole circuit breaker.
  • the support rod 25 is placed parallel to the rotary shaft 17.
  • a support rod 25 is used in this embodiment.
  • the two support rods 25 are divided into two sides of the rotary shaft 17, which are placed parallel to the rotary shaft 17, and each single-stage open circuit
  • the unit 1 shares a support rod 25, and each of the auxiliary support members 15 on the rotary shaft assembly 100 is coupled to the two support rods 25, and the two support rods 25 are fixedly mounted on the housing 24 of the single pole breaking unit.
  • the auxiliary support members are all connected to the support rod 25, so that the support jaws 25 not only provide a supporting force for each of the auxiliary support members 15, but also the auxiliary support members 15 The supporting force does not compete, thereby ensuring the rotation precision and the rotational flexibility of the rotary shaft assembly 100; using the two support rods 25 to jointly provide the supporting force to the auxiliary support member, the positioning accuracy of the auxiliary support member 15 can be greatly improved.
  • the support rod 25 is one, the positioning accuracy of the auxiliary support member 15 is lowered;
  • the number of the support bars 25 is more than two, the mounting of the auxiliary support members 15 is difficult, and at the same time, the factor of the strong interference between the supporting forces of the respective auxiliary support members 15 is increased.
  • the preferred angle ⁇ of the adjacent two support rods 25 with respect to the center of the circle is 60 to 120 degrees (including the end points) to ensure the stability of the support, and the angle shown in Fig. 6 is 90-110 degrees. between.

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Description

带辅助支撑件的多极断路器
技术领域
本发明涉及一种低压断路器， 特别是一种适用于双断点多极断 器回转轴 组件的辅助支撑结构。
背景技术
低压断路器是一种具有保护功能的执行主电路的输入端与.负载端之间通 / 断的低压电器， 它至少包括执行主电路通 /断任务的触头系统、控制触头系统执 行通 /断任务的操作机构、用于将断路器连接主电路的输入端和负载端的接线装 置、 用于安装操作机构、 触头系统和接线装置的外壳， 所述的触头系统还包括 动触头、 静触头和触头支持， 而动触头则安装在触头支持上并随触头支持的动 作而执行与静触头的闭合 /分断。所述的触头支持与操作机构连接， 并随操作机 构的控制而动作。 触头系统分双断点或单断点两类。 双断点触头系统每极具有 两个串连的动触点和两个分别连接于主电路的输入端、 负载端的静触点， 而单 断点触头系统每级只有一个动触点和一个静触点。 单极断路器的触头系统只有 一组动触头、 静触头， 而多极断路器则具有多组动触头、 静触头， 动触头、 静 触头的组数与断路器的极数相等。
由于双断点触头系统的分断能力高于单断点， 电流在断路器的两个串联的 触头上分断， 每个触头承受较低的机械和热应力， 并且具有两个串联的电弧电 压从而提高了分段能力， 所以被广泛应用于塑壳断路器。 但对于默断点触头系 统的各单极断路器需要解决如下问题： 如何使两对动触头、 静触头之间具有均 衡的机械接触压力， 否则会导致断路器的导电能力下降。 欧洲专利 EP0314540 公开了一种单极断路器的技术方案， 其特征是： 触头支持为一个回转轴； 具有 两个动触点的动触头通过弹簧安装在回转轴上； 两动触点之间的中点与回转轴 的轴心重合， 以使两个动触点的移动轨迹保持对称； 两个动触点与静触点的接 触压力由所述弹簧提供， 以改善所述单极断路器两组触头接触压力分布不均衡 的问题。 EP0314540专利的缺陷是： 回转轴的回转精度^ ί艮差； 没有考虑回转轴 系统在多级断路器系统中的稳定适用问题。 在多极触头系统中回转轴延伸较长， 在回转轴转动时会因其受力产生明显 的扭转现象, 使远离中心断路器的动触头动作较晚， 大大加深了各级触头接触 压力的不均衡的问题。 另外， 由于多极断路器每一极的触头系统因灭弧要求需 安装隔离在独自的灭弧室内， 所以装有多组动触头的回转轴需穿过各个灭弧室 的分隔壁， 才能使各组动触头安装到各自的灭弧室内， 很显然， 这对回转轴的 支撑结构的设计带来了极大的难度， 从而也导致了回转轴的支撑结构复杂、 安 装调试困难等技术难题的出现。
申请号为 200710151603.1 的发明专利提供了一种与本发明不同的技术方 案， 其特征是： 回转轴组件由多个触头支持、 回转轴和滚动轴承组成， 回转轴 组件通过其上的滚动轴承和多极断路器外壳内的分隔壁上的轴承座和轴承盖 板被安装。 这一方案可很好地提高回转轴组件的运动精度和运动灵活性， 但它 存在以下两个局限性： 一是由于该种方案仅依靠分隔壁来稳定回转轴， 因此需 要轴承盖板的配合才能将回转轴组件稳定的安装支撑在断路器的分隔壁上， 所 以安装精度不够理想、 调试复杂， 影响生产效率； 二是为了保证支撑的稳定性 和精确性， 这种技术方案无法适用于由多个独立的分体单极断路器组成的多级 断路器， 只能适用于壳体为整体结构的多级断路器， 即通过分隔壁分开的各单 极断路器。
由独立的分体单极断路单元组成的多极断路器有利于优化工业化生产效 率和降低生产成本， 由于每个单极断路单元可以通用于不同极数的多极断路 器， 因^仅采用一条生产线、 一套模具、 一种零部件就可生产出极数不同的断 路器。但各独立的分体单极断路单元需受同一个操作机构控制执行通 /断操作和 脱扣跳闸动作， 所以给回转轴的支撑和驱动结构设计带来了新的难题。
发明内容 本发明是一种带有辅助支撑件的断路器， 其设计目的在于克服了现有技术 的多极断路器的回转轴支撑不合理， 使回转轴产生明显扭转现象所导致的动触 点与静触点的接触压力不均衡， 以及因回转轴组件设计不合理造成的操作驱动 力和跳闸驱动力大、 回转轴转动不灵活和跳闸速度慢、 制造难度大、 生产成本 高等一系列缺陷。 本发明采用了将操作机构支撑在回转轴系统的支撑杆上， 并 利用支撑杆及辅助支撑件直接地、 多点地向回转轴提供稳定的支撑力的技术方 案， 确保了触头支持的运动稳定性， 加强了各触头接触压力的均衡性， 结构简 单、 大大提高了产品的分断能力、 可靠性、 安全性等内在性能， 延长了产品的 使用寿命。 为了实现上述目的， 本发明釆用了如下技术方案：
一种带有辅助支撑件的多极断路器， 它包括一个基座、 N个单极断路单元、 一个控制各单极断路单元执行分 /断操作的操作机构和一个共用于各单极断路 单元的回转轴组件。 所述的单极断路单元包括： 壳体、 一个灭弧室、 两个称对 称分布的静触头、 两个对称分布的灭弧栅、 两个分别与静触头相连接的接线装 置。
所述的回转轴组件由 N-1个支撑组件和 N个触头支持串接组装而成，每个 支撑组件的两侧均设有一个触头支持， 每个触头支持上均设有一个桥式双断点 动触头， 动触头通过其上的弹簧与触头支持链接。 所述的操作机构与回转轴组 件直接连接，以直接驱动各触头支持上的 N个动触头与各单极断路单元的静触 头作同步分断 /闭合操作。
所述的支撑组件由回转轴、 辅助支撑件、 辅助支撑件的轴承和至少一个支 撑杆组成； 一个轴孔设置在触头支持的轴心位置上， 所述的回转轴通过轴孔插 入到支撑组件两侧的触头支持内， 所述回转轴与触头支持保持同步旋转。 一个 轴承孔设置在所述的辅助支撑件上， 所述轴承的外侧与辅助支撑件的轴承孔紧 密装配， 所述轴承的内侧与回转轴紧密装配， 紧密装配是指一种稳定的连接关 系， 当断路器处于动作过程时， 紧密装配使轴承的外侧与辅助支撑件之间、 轴承的内侧与回转轴之间不会产生错位或相对位移。
本发明的技术方案中的轴承可以选用滚动轴承， 也可以选用滑动轴承。 所 述的轴承是滚动轴承时， 所述的回转轴与滚动轴承的内圈过盈配合安装， 所述 的滚动轴承的外圏与辅助支撑件上的轴承孔过盈配合安装， 轴承的外圈和内圈 之间利用轴承的保持架引导并带动滚动体在正确的滚道上滚动。 当所述的轴承 是滑动轴承时， 所述滑动轴承的轴瓦形成在辅助支撑件上； 而所述的轴颈形成 在回转轴上。 这些都为辅助支撑件能够有效为回转轴提供稳定支撑力提供了保 证。
至少一个支撑杆安装孔设置在所述的辅助支撑件上， 所述的支撑杆与支撑 杆安装孔紧密装配， 所述支撑杆平行于回转轴放置， 各支撑组件共用支撑杆。 所述操作机构也通过支撑杆与回转轴组件固定连接， 所述支撑杆安装固定在所 述的单极断路单元的壳体上， 并通过各辅助支撑件为旋转轴提供稳定的支撑 力。 这种支撑系统的好处在于， 支撑杆为操作系统提供支持力得同时， 也在通 过各级辅助支撑件直接为旋转轴提供的支撑力， 且兼顾传递了壳体的支撑力， 经实验验证这种新的支撑体系可以大大降低远端触头的扭转现象。
为了进一步稳定回转轴与触头支持之间的连接关系， 本发明还采用了以下 技术方案： 所述的回转轴在靠近触头支持的位置设有至少一个外平面， 在所述 的触头支持的轴孔内设有至少一个内平面， 所述外平面与内平面相互紧贴， 一 一对应匹配工作， 以使回转轴与轴孔之间不会因力矩载荷而发生错位。
安装在回转轴组件上的操作机构是通过控制连杆驱动触头支持运动的。 在 所述触头支持上设有操作机构控制孔， 所述操作机构伸出控制操作臂， 所述控 制操作臂直接连接到触头支持的操作机构控制孔内， 以完成操作机构对触头支 持的直接驱动控制。
当釆用多跟支撑杆时， 相邻两支撑杆之间以回转轴为圆心所形成的角度 α 优选在 60 ~ 120度之间。 采用本发明的设计可以灵活适用于多种壳体类型的断路器， 所述的单极断 路单元的壳体与所述的多极断路器的基座可以是一体形成的一个元件； 或者所 元件； 或者单极断路单元的各壳体是一体形成的一个元件， 其与多极断路器的 基座分体成形。 这些方案均可适用于本发明的设计方案。 附图说明
图 1是本发明的带有辅助支撑件的 3级断路器的一个具体实施例的局部结 构透视图；
图 2是图 1所示的单极断路器的 A-A截面剖视图。
图 3是本发明的带有辅助支撑件的 4级断路器的一个实施例的局部试图， 具体涉及回转轴组件的结构示意图。
图 4是本发明的带有辅助支撑件的多级断路器的支撑组件实施例的结构示 意图。
图 5是本发明的带有辅助支撑件的断路器的触头支持的结构示意图。
图 6是本发明的带有辅助支撑件的断路器辅助的辅助支撑件具体实施例的 结构示意图。
具体实施方式
以下结合附图详细说明本发明的带有辅助支撑件的多极断路器的实施例， 本发明的带有辅助支撑件的多极断路器不限于以下实施例。
该断路器的极数 N可以根据生产需要确定为 2极、 3极或 4级等， 如图 1 给出了 3极断路器的局部结构透视图， 其中第三极仅示出部分结构。 所述多级 断路器包括： 多个单极断路单元 1 , 所述单极断路单元 1的数量与断路器的极 数 N相等， 如图 1所示 N为 3; —个基座（图中未示出） ， 所述多个单极断路 单元 1均安装在基座上； 一个操作机构 102， 该操作机构 102用于控制 N个单 极断路单元执行分 /断操作；和一个由 N个单极断路单元共用的回转轴组件 100。
如图 1、 图 2所示， 每个单极断路单元 1均包括以下元件： 由单极断路单 元的壳体 24形成的灭弧室 2; 两个相对于旋转轴轴心对称分布的静触头， 如图 2中所示的第一静触头 29和第二静触来 33; 两个相对于旋转轴轴心对称分布 的灭弧栅， 如图 2中所示的第一灭弧栅 36和第二灭弧栅 37; 两个接线装置分 别与两静触头相连接， 如图所示的接 ^装置 4为其中一个接线装置， 另外一个 接线装置图中未示出。 在第一静触头 29上设有第一静触点 28, 在第二静触头 33上设有第二静触点 34。 如图 2所示的实施例， 各单极断路单元 1的壳体 24 均为 体成形的独立元件， 即将多个独立的分体单极断路器单元的壳体 24组 装到一个独立的基座上， 此时需要通过连接板 38将单极断路单元的壳体 24串 联连接成一个壳体组件并与多极断路器的基座连接固定。 所述连接板 38设置 在单极断路器的壳体 24上， 其上具有螺纹槽， 通过该螺紋槽可将壳体 24用螺 钉固定在基座上。 本发明还可适用于壳体为整体成型的多个单极断路单元， 例 如： 各单极断路器的壳体 24 与多极断路器的基座一体成形， 在此情况下， 单 极断路器的灭弧室实际上是由多极断路器外壳内的分隔壁组成。 无论采取哪种 外壳结构， 由于本发明采用了辅助支撑件的技术方案， 所以很好地解决了回转 轴组件既适用于壳体 24为独立分体结构的多极断路器， 又适用于壳体 24为整 体结构的多极断路器的技术难题。
图 1和图 3示出了回转轴组件 100的具体实施方式。 如图 3的一个 4极断 路器的回转轴组件 100由 N-1个（即 3个）支撑组件 101和 N个（即 4个）触 头支持 12串接组装而成。支撑组件 101不仅是串联组装的 N个触头支持 12的 连接件， 同时为回转轴组件 100提供支撑力。 支撑组件 101为两个相邻的触头 支持共用的支撑组件， 它紧靠触头支持 12的端部， 因此具有很好的支撑效果。 虽然回转轴组件 100也成细长轴的形状， 但由有多个支撑组件 101构成的支撑 结构， 所以大大增强了回转轴组件 100的刚度， 消除了其弯曲变形， 使动触点 与静触点之间的接触压力十分均衡， 回转轴组件 100的转动十分灵活。
如图 5所示，触头支持 12上设有一个贯通的轴孔 121、一个垂直于轴孔 121 的贯通的触头槽 122 和至少一个操作机构控制孔 123、 至少一个弹簧安装部 125: 所述的回转轴 17通过轴孔 121连接到支撑组件 101 两侧的触头支持 12 内， 轴孔 121与回转轴 17 (图 4所示）呈过盈配合， 以保证所述回转轴 17与 触头支持 12同步旋转； 触头槽 122用于容纳安装动触头 40 (图 2所示） ； 操 作机构控制孔 123用于把操作机构 102直接连接到各触头支持 12,使触头支持 12能得到操作机构 102最直接的控制； 弹簧孔 125用于安装弹簧 39 (图 2所 示） ， 弹簧 39用于将动触头 40安装到触头支持 12上并使动触头 40随触头支 持的转动而转动。 回转轴组件 100的各触头支持 12上均装有动触头 40 (见图 2所示） , 各 动触头 40分别与各单极断路单元 1 (图 1所示）的第一静触头 29 (图 2所示）、 第二静触头 33 (图 2所示） 配合实现各单极断路单元的同步闭合 /分断, 所以 回转轴组件 100是各单极断路单元共用的部件。回转轴组件 100与操作机构 102 直接连接， 其中操作机构 102通过支撑杆 25安装在回转轴组件 100上， 操作 机构 102对各级触头支持 12的控制连接关系具体见图 2、 图 5所示， 在触头支 持 12上设有操作机构控制孔 123 , 从操作机构 102中伸出的控制操作臂 32, 在所述控制操作臂 32直接连待到触头支持 12的操作机构控制孔 123内， 当操 作机构 102动作时， 操作机构 102的控制操作臂 32直接驱动触头支持 12绕回 转轴 17的轴心旋转， 从而带动触头支持 12内安装的动触头 40同步转动， 所 以在操作机构 102的驱动下， 回转轴组件 100上的各动触头分别地与各单极断 路单元的静触头作同步的分断 /闭合操作，从而确保了多极断路器的各个动触点 与静触点的分断 /闭合的同步性。 很显然， 本发明的回转轴组件 100的结构， 不 仅适用于外壳为分体结构的多极断路器 , 而且还适用于外壳为整体结构的多极 断路器。
如图 1和 2所示， 本发明的带有辅助支撑件的多极断路器采用了桥式双断 点动触头。 动触头 40的两端设有第一动触点 41和第二动触点 35。 第一动触点 41和第二动触点 35以回转轴 100的回转轴心为作点对称布置。 第一动触点 41 与第一静触点 28配合实现断路器的闭合 /分断操作，第二动触点 35与第二静触 点 34配合实现断路器闭合 /分断操作。 由于第一动触点 41与第二动触点 35按 点对称布置， 所以当回转抻组件 100绕其回转轴 17的轴心转动一个操作角度 时，驱动第一动触点 41与第二动触点 35闭合 /分断动作， 以实现单极断路单元 的主电路的通 /断操作。 动触头 40通过弹簧 39被安装到触头支持 12上的触头 槽 122 (见图 5 ) 中， 这种弹性安装结构的优点是： 可使动触点与静触点之间 形成弹性的接触压力， 以改善接触可靠性； 可使第一动触点 41 所受的接触压 力与第二动触点 35 所受的接触压力的大小均衡； 还可緩解由于动触头的超程 动作给动、静触头带来的冲击力。 第一静触头 29和第二静触头 33均设有 U形 结构， 该 U形结构可使动触头与静触头在触点附近的电流方向相反， 以在大电 流（过载或短路电流）情况下动触头与静触头之间能自动产生电磁斥力， 从而 提高分断能力。 在图 2所示的实施例中， 弹簧 39为两根拉簧。 弹簧 39的一端 与触头支持 12连接， 另一端与动触头 40连接。 在其他实施方式中， 弹簧 39 的个数可以是一个， 因为利用一个弹簧同样可以将动触头 40安装于触头支持 12上， 也同样可以使动触点与静触头之间形成弹性接触压力。 然而， 如果采用 两根弹簧以对称的形式布置， 可以使第一动触点 41 所受的接触压力与第二动 触点 35所受的接触压力的均衡性更好。 另外， 弹簧 39也可以采用扭簧， 也就 是说， 扭簧和拉簧其实是可以相互替代的同一种实施方式。
如图 1、 3、 4所示， 所述的支撑组件 101由回转轴 17、 辅助支撑件 15的 轴承 16、 辅助支撑件 15和支撑杆 25組成。 如图 6所示， 所述辅助支撑件 101 上设有一个用于安装轴承的轴承孔 153 ,还设有至少一个用于连接支撑杆 25的 支撑杆安装孔 151。 所述轴承 16安装在辅助支撑件 101的轴承孔 153内， 可以 是滚动轴承或滑动轴承中的一种， 所述回转轴 17安装在轴承 16内。 所述回转 轴 17通过该轴承 16与实现辅助支撑件 101紧密配合， 在得到辅助支撑件 101 的支撑力的同时还能保持回转轴 17转动的灵活性。 所述回转轴 17的两侧各连 有一个触头支持 12。
如图 4和 5所示， 在回转轴 17靠近触头支持 12的两端的轴头上， 设有平 行于回转轴线的外平面 171 ; 在触头支持 12侧面设有一个用于安装回转轴 17 的轴孔 121， 所述轴孔 121 内设有平行于轴孔 121 中心线的内平面 124, 该内 平面 124与回转轴 17上的外平面的数量、 形状均 、相互匹配， 当回转轴 17.的轴 头插入轴孔 121内时， 所述的外平面 171与内平面 124相互紧贴， 以保证回转 轴 17和触头支持 12同步绕回转轴 17的轴心旋转。 回转轴 17上的轴头与触头 支持 12的轴孔 121之间的配合为过盈配合， 但能保证利用工具使所述轴头与 轴孔 121顺利安装。 由于采用了轴头与轴孔 121之间的过盈配合、 轴头上的外 平面 171与轴孔 121的内平面 124之间的紧贴配合， 所以确保了回转轴 17与 触头支持 12之间不松动、 不错位， 不管回转轴 17和触头支持 12受到何种载 荷（如沖击载荷、 力矩载荷） ， 都不会发生松动或错位的隐患。 从上述描述不 难得到如下推理， 设置在回转轴 17两端的轴头上的外平面 171至少为一个， 设置在触头支持 12上的内平面 124至少为一个， 内平面 124与外平面 171的 个数及位置关系应 匹配。 很显然， 当内平面 124和外平面 171的个数增加 时， 会增加制造难度， 但可以改善防错位的技术效果。
如图 3和 4所示的轴承 16， 其具体实施例是滚动轴承 16。 滚动轴承 16包 括轴承内侧 161的内圈、 轴承外侧 162的外圈、 内圈与外圈之间的滚动体（图 中未示出）、 和保持架（图中未示出）四种基本元件。 滚动轴承 16的外圈 162 安装在辅助支撑件 15的轴承孔 153 内， 两者相互配合紧密安装。 为使所述的 外圈与轴承孔 153不产生松动， 所以外圈与轴承孔 153之间应采用过盈配合， 但还应保证借助工具能顺利装配。滚动轴承 16的内圈 161安装在回转轴 17上， 两者相互配合紧密安装。 为使所述的内圏与所述的回转轴 17 不产生松动， 所 以内圈与回转轴 17之间应釆用过盈配合， 但应保证借助工具能顺利装配。 外 圈 162与内圈 161之间通过滚动体如滚珠形成滚动摩擦。 由于采用了滚动轴承 16， 所以使回转轴组件 100的回转精度很高， 转动十分灵活。
轴承 16 的另一种可替代的方式是滑动轴承。 滑动轴承包括轴承内侧 161 的轴颈和轴承外侧 162的轴瓦两种基本元件。 滑动轴承的轴颈形成在被支撑的 回转轴 17上， 两者可以是一体成型的也可以是分体装配的； 所述滑动轴承轴 瓦形成在支撑轴承的辅助支撑件 15上， 两者可以是一体成型的也可以是分体 装配的。 本发明在采用滑动轴承方案下所优先推荐的一种技术方案是： 所述的 滑动轴承的轴瓦形成在辅助支撑件 15上， 并与辅助支撑件 15上的轴承孔 153 一体成形； 而所述的轴颈形成在回转轴 17的中间部， 轴承内侧 161的轴颈和 轴承外侧 162的轴瓦之间通过润滑剂实现滑动摩擦。 下面结合图 4、 6详细说 明滑动轴承的技术方案与前述的采用滚动轴承的技术方案的异同。如图 6所示， 辅助支撑件 15上设有轴承孔 153; 在采用滚动轴承时， 轴承孔 153与滚动轴承 孔的外圈过盈配合； 在采用滑动轴承时， 轴承孔 153直接与回转轴 17滑动配 合， 以给回转轴 17滑动支撑。 如图 4所示中的回转轴 17， 在采用滚动轴承时， 所述的轴颈与滚动轴承 16 的内圈过盈合； 在采用滑动轴承时， 所述的轴颈与 辅助支撑件 15的轴承孔 153 (图 6所示）滑动配合。 从上两种方案的比较分析 可以得出： 辅助支撑件 15必需通过轴承才能支撑回转轴 17， 所以回转轴 17必 需与轴承配合安装， 轴承必需与辅助支撑件 15配合安装； 在采用滚动轴承 16 时， 上述的回转轴 17、 滚动轴承 16和辅助支撑件 15三者之间的配合安装关系 艮好理解；在采用滑动轴承时，由于滑动轴承的带有滑动支撑面的两个元件（设 置在回转轴 17上的轴颈和设置在辅助支撑件 15上的轴瓦）分别形成在回转轴 17和辅助支撑件 15上， 所以上述的回转轴、 滑动轴承和辅助支撑件 15三者之 间的配合安装 系形成了特例。 在这种特例下： 回转轴 17 与滑动轴承的轴颈 之间的配合安装形式为一体成形； 滑动轴承的轴瓦与辅助支撑件 15之间的配 合安装形式为一体成形。 另一种可替换的实施方式是滑动轴承的轴瓦与辅助支 撑件 15之间的配合安装形式为分体的两个元件， 两分体元件分别紧密装配在 回转轴 17和辅助支撑件 15上， 很显然， 该实施方式的结构比上述的一体成形 的结构复杂， 其技术基本效果相同。
与滚动轴承相比， 滑动轴承具有结构简单、 制造成本低等优点， 但其转动 灵活度远远差于滚动轴承。很显然，本发明的支撑组件 101优先采用滚动轴承， 也可釆用滑动轴承。
如图 1、 3、 4、 5所示，在辅助支撑件 15上具有至少一个支撑杆安装孔 151。 所述支撑杆安装孔 151用于与支撑杆 25紧密配合连接， 从而将辅助支撑件 15 安装固定在单极断路单元的壳体 24或多极断路器的基座（未示出）上， 所述 支撑杆 25平行于回转轴 17放置。 通过这种悬挂结构保证各级断路器及其触头 支持 12的旋转轴 17均已同轴稳定转动。 为了保证辅助支撑件 15安装的稳定 性， · 可在支撑杆 25上、 辅助支撑件 15的两侧放置定位装置。
在图 1给出了一个优先的实施例中， 该实施例所采用的是两个支撑杆 25， 两支撑杆 25分处旋转轴 17的两侧， 平行与回转轴 17放置， 各单级断路单元 1 共用支撑杆 25， 回转轴组件 100上的每个辅助支撑件 15均连接于两个支撑杆 25上， 而两个支撑杆 25则固定安装在单极断路单元的壳体 24上。应用机械学 原理不难分析得出该实施例的优点是： 辅助支撑件均连接于支撑杆 25， 所以支 撑扞 25不仅为每一个辅助支撑件 15提供支撑力， 而且各辅助支撑件 15所的 受支撑力不会较劲， 从而确保了回转轴组件 100的回转精度和转动灵活度； 采 用两个支撑杆 25共同对辅助支撑件提供支撑力， 可大大提高辅助支撑件 15的 定位精度。很显然， 当支撑杆 25为一个时， 辅助支撑件 15的定位精度会下降； 当支撑杆 25为大于 2个时， 辅助支撑件 15的安装会困难， 同时还会增加各辅 助支撑件 15所受的支撑力之间的较劲干扰的因素。 以回转轴 17为圆心， 相邻 两支撑杆 25相对于圆心所呈的优选角度 α为 60 ~ 120度（包括端点） ， 以保 证支撑稳定度， 如图 6所示角度在 90-110度之间。

Claims

权 利 要 求 书
1. 一种带有辅助支撑件的多极断路器， 它包括一个基座、 N个单极断路单 元 (1)、 一个控制各单极断路单元执行分 /断操作的操作机构（102)和一个共用于 各单极断路单元的回转轴组件（100),
所述的单极断路单元 (1)包括： 壳体、 一个灭弧室 (2)、 两个称对称分布的静 触头 (29、 33)、 两个对称分布的灭弧栅 (36、 37)、 两个分别与静触头相连接的接 线装置 (4)，
所述的回转轴组件 (100)由 N-1个支撑组件 (101)和 N个触头支持 (12) 串接 组装而成， 每个支撑组件 (101)的两侧均设有一个触头支持 (12), 每个触头支持 (12)上均设有一个桥式双断点动触头 (40)，
所述的操作机构（102)与回转轴组件 (100)直接连接，以直接驱动各触头支持 (12)上的 N个动触头 (40)与各单极断路单元 (1)的静触头 (29、 33)作同步分断 /闭 合操作，
其特征在于：
所述的支撑组件 (101)由回转轴 (17)、辅助支撑件 (15)、辅助支撑件的轴承 (16) 和至少一个支撑杆 (25)组成； 、
一个轴孔 (121)设置在触头支持 (12)上， 所述的回转轴 （17 )通过轴孔 (121) 插入到支撑组件 (101)两侧的触头支持 (12)内， 所述回转轴 (17)与触头支持 (12) 保持同步旋转，
一个轴承孔（ 153 )设置在所述的辅助支撑件（ 15 )上， 所述轴承 (16)的外 侧 (162)与辅助支撑件（ 15 )的轴承孔（ 153 )紧密装配，所述轴承 (16)的内側 (161) 与回转轴 (17)紧密装配，
至少一个支撑杆安装孔 (151)设置在所述的辅助支撑件（15 )上， 所述的支 撑杆 (25)与支撑杆安装孔（151 ) 紧密装配， 所述支撑杆 (25)平行于回转轴 (17) 放置， 各支撑组件 (101)共用支撑杆（25 ) , 所述操作机构（102)通过支撑杆（25) 与回转轴组件 (100)固定连接， 所述支撑杆（25)安装固定在所述的单极断路单元的壳体（24)上， 并道 过各辅助支撑件 （15) 为旋转轴 (17)提供稳定的支撑力。
2.根据权利要求 1所述的带有辅助支撑件的多极断路器， 其特征在于： 所 述的回转轴（17)在靠近触头支持 (12)的位置设有至少一个外平面 （171) ， 在 所述的触头支持（12) 的轴孔（121) 内设有至少一个内平面 （124) ， 所述外 平面（ 171 )与内平面（ 124)相互紧贴， ——对应匹配工作， 以使回转轴（17) 与轴孔（121)之间不会因力矩载荷而发生错位。
3.根据权利要求 1所述的带有辅助支撑件的多极断路器， 其特征在于： 以 回转轴（17)为圆心， 相邻两支撑杆（25)之间的角度 α为 60- 120度。
4.根据权利要求 1所述的带有辅助支撑件的多极断路器， 其特征在于： 所 述操作机构（102)伸出控制操作臂 (32), 所述触头支持 (12)上设有操作机构控制 孔 (123)， 所述控制操作臂 (32)直接连接到触头支持 (12)的操作机构控制孔 (123) 内， 以完成操作机构（102)对触头支持 (12)的直接驱动控制。
5.根据权利要求 1所述的带有辅助支撑件的多极断路器， 其特征在于： 所 述的轴承（16)是滚动轴承， 所述的回转轴（17)与滚动轴承（16) 的内圈过 盈配合安装，所述的滚动轴承（ 16)的外圈与辅助支撑件（ 15 )上的轴承孔（ 153 ) 过盈配合安装；
6.根据权利要求 1所述的带有辅助支撑件的多极断 器， 其特征在于： 所 述的轴承（ 16)是滑动轴承； 所述滑动轴承的轴瓦形成在辅助支撑件上； 而所 述的轴颈形成在回转轴 (17)上。
7.根据权利要求 1所述的带有辅助支撑件的多极断路器， 其特征在于： 所 述的单极断路单元的壳体（24)与所述的多极断路器的基座是一体形成的； 或 者所述的各单极断路单元的壳体与所述的多极断路器的基座均为分体成形的 独立元件； 或者单极断路单元的各壳体（24)是一体形成的一个元件， 其与多 极断路器的基座分体成形的。 .
PCT/CN2010/000706 2009-06-05 2010-05-19 带辅助支撑件的多极断路器 WO2010139185A1 (zh)

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EP10782889.9A EP2439762B1 (en) 2009-06-05 2010-05-19 Multiple pole breaker with auxiliary supporting pieces
KR1020117024560A KR101242709B1 (ko) 2009-06-05 2010-05-19 보조 지지구가 구비된 다극 회로 차단기
US13/321,473 US8664550B2 (en) 2009-06-05 2010-05-19 Multi-pole circuit breaker with auxiliary supporting pieces

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CN200910143585A CN101604600B (zh) 2009-06-05 2009-06-05 带辅助支撑件的多极断路器
CN200910143585.1 2009-06-05

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EP2416332A1 (de) * 2010-08-06 2012-02-08 Eaton Industries GmbH Schaltvorrichtung für ein elektrisches Niederspannungsschaltgerät
JP6301659B2 (ja) * 2014-01-17 2018-03-28 株式会社神戸製鋼所 パルス大電流スイッチ
CN204375671U (zh) * 2014-11-20 2015-06-03 浙江正泰电器股份有限公司 多极双断点塑壳断路器
CN104409293A (zh) * 2014-12-12 2015-03-11 常熟市通润开关厂有限公司 一种多极断路器的辅助机构
US9576761B2 (en) * 2015-05-20 2017-02-21 General Electric Company Circuit breaker crossbar assembly
CN110504144A (zh) * 2019-09-26 2019-11-26 杭州泰姆电气有限公司 一种断路器操作组件

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Publication number Publication date
EP2439762B1 (en) 2017-07-12
EP2439762A1 (en) 2012-04-11
US20120061215A1 (en) 2012-03-15
CN101604600A (zh) 2009-12-16
KR20120012456A (ko) 2012-02-10
EP2439762A4 (en) 2014-06-11
KR101242709B1 (ko) 2013-03-12
CN101604600B (zh) 2012-10-03
US8664550B2 (en) 2014-03-04

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