CN113161204B

CN113161204B - Emergency locking device for circuit breaker

Info

Publication number: CN113161204B
Application number: CN202110374210.7A
Authority: CN
Inventors: 伍轩; 马子文; 赵成宏; 徐凯; 孔凡良
Original assignee: Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corp No 712 Institute CSIC
Current assignee: Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corp No 712 Institute CSIC
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2022-06-28
Anticipated expiration: 2041-04-07
Also published as: CN113161204A

Abstract

The invention discloses a breaker emergency locking device with clearance compensation capacity, which consists of an operating part and a transmission part, wherein the operating part and the transmission part are respectively arranged on a breaker frame; the emergency locking device has the functions of shortening the moving chain and eliminating the moving clearance of the release, and has high reliability. The device has the characteristics of modularization and fool-proofing in the operation process, few components are formed, the mechanism parts are simple, and the problems of high requirement of the mechanism on part processing, high production cost and difficult assembly are avoided.

Description

Emergency locking device for circuit breaker

Technical Field

The invention belongs to the field of circuit breakers, and particularly relates to a circuit breaker emergency locking device with a gap compensation capability.

Background

The breaker is a distribution electrical appliance used in the power grid, and can connect, bear and break the current under normal circuit conditions, and also can connect, bear and break the current for a certain time under the specified abnormal conditions (such as overload, short circuit, undervoltage and other faults).

For power systems in special use scenarios (such as ship power systems), the circuit breaker is often required to be additionally provided with an emergency locking device so as to control the overcurrent release. When the emergency lock catch is in the automatic position, the overcurrent release normally operates; when the emergency latch is in the latched position, the overcurrent release cannot open the closed circuit breaker even if an overcurrent is generated. The reliability of the emergency locking device is crucial to achieving this function.

The existing emergency locking device of the circuit breaker mostly adopts a link mechanism, or locks a release by using a mechanism dead point position, or blocks the movement of the release by using multi-stage transmission. In order to facilitate the operation, the direction and the movement form of the operation end of the emergency lock catch are different from the movement direction of the internal release, so that the number of parts of the device is large, the mechanism movement chain is long, and the movement error is large. To ensure high reliability, high part and equipment accuracy is also required, which increases production cost.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides an emergency locking device for a circuit breaker with a gap compensation capability, so as to achieve a function of controlling the movement of a release of the circuit breaker.

The technical scheme adopted by the invention for solving the technical problem is as follows: an emergency locking device for a circuit breaker comprises an operating part and a transmission part driven by the operating part, wherein the operating part and the transmission part are respectively fixed on a first mounting bracket and a second mounting bracket, the operating part comprises a fixed seat fixedly mounted on the first mounting bracket through a first screw and an operating rod reciprocating in a hole formed by assembling the first mounting bracket and the fixed seat, the transmission part comprises an intermediate support fixedly mounted on the second mounting bracket through a second screw and a spring sleeved on the operating rod, one end of the spring is positioned on a gasket on the operating rod, the other end of the spring is tightly pressed on the intermediate support and used for resetting the operating rod, the operating rod is sleeved on the intermediate support, the end part of the operating rod is sleeved with a transmission shaft, the operating rod comprises a long shaft and a first split pin and a pin fixedly mounted on the long shaft, one side end of first split pin is located the gasket, and the axle head of major axis is fixed with operating handle, through pressing and the motion of the steerable major axis of rotatory operating handle, the transmission shaft including the sleeve of suit at the operating rod tip and the second round pin axle of fixed mounting on the sleeve, second round pin axle fixed mounting is on the sleeve through the synergism on operating rod and middle support inclined plane, the second round pin axle drives the sleeve and is the screw motion along self axis.

A emergent locking device for circuit breaker, install first round pin axle through interference fit on its major axis, rotate with the inside groove cooperation control major axis of fixing base.

The emergency locking device for the circuit breaker is characterized in that a step for limiting a first pin shaft is arranged in a fixing seat.

The sleeve of the emergency locking device for the circuit breaker is provided with a kidney-shaped hole matched with the pin.

Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:

the invention adopts a modular design, consists of an operation part and a transmission part, has few parts and simple part structure, and avoids the problems of high requirement of the mechanism on part processing, high production cost and complex assembly.

2, the invention has the functions of shortening the kinematic chain and eliminating the movement clearance of the release by the separated design of the operation part and the transmission part, thereby improving the reliability of the mechanism; simultaneously emergent locking device's state switching operation possesses prevents slow-witted nature, avoids the maloperation, has improved the security of device.

3, in the process of switching the state of the emergency locking device, the through hole, the step and the groove of the fixed seat are matched with the first pin shaft on the operating rod, so that the operating rod can be effectively prevented from rotating to an abnormal position, and when the operating rod rotates to a free and locked state, the operating rod has an obvious in-place sense prompt, and further misoperation is avoided; the transmission part is in the process of emergent locking device state switching, and when the locking position, the axial motion of operating portion is separated with the transmission part, and the transmission part can not be influenced in the back-off of operating portion, and the reliability of locking is higher.

Drawings

FIG. 1 is a schematic diagram of the mechanism of the present invention;

FIG. 2 is a schematic composition of the present invention;

FIG. 3 is a schematic cross-sectional view of the free state of the present invention;

FIG. 4 is an enlarged schematic view of the transmission portion of the present invention;

FIG. 5 is a schematic view of the direction of movement of the present invention from the free state to the locked state shown in FIG. 1;

FIG. 6 is a schematic view of the direction of movement of the present invention from the free state to the locked state shown in FIG. 2;

fig. 7 is a schematic view of the locked state of the present invention.

The figures are numbered: 1-an operating part, 2-a transmission part, 11-a first mounting bracket, 111-a first screw, 12-a fixed seat, 13-an operating rod, 131-a long shaft, 132-a first pin shaft, 133-an operating handle, 134-a first cotter pin, 135-a pin, 136-a second cotter pin, 14-a gasket, 15-a spring, 21-a second mounting bracket, 211-a second screw, 22-an intermediate support, 23-a transmission shaft, 231-a sleeve, 232-a second pin shaft.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

Based on modular design, the emergency locking device of the circuit breaker is composed of an operation part 1 and a transmission part 2, and refer to fig. 1. The operating part 1 obtains power by an operator rotating knob, the transmission part 2 controls the movement of the circuit breaker tripper under the driving of the operating part 1, the operating part 1 and the transmission part 2 are respectively fixed on the first mounting bracket 11 and the second mounting bracket 21, and no distance requirement exists between the first mounting bracket 11 and the second mounting bracket 21.

The invention aims to overcome the defects of the prior emergency locking device of the circuit breaker: (1) the mechanism is redundant, the number of important parts is large, the appearance is complex, and the production cost is high; (2) too long moving chain, large gap and insufficient reliability. The circuit breaker emergency locking device with the clearance compensation capability is composed of an operation part 1 and a transmission part 2, through the separated design of the operation part 1 and the transmission part 2, a moving chain between a transmission part and a release is greatly shortened, through the preset compensation size of an intermediate support 22, the moving clearance of the release can be effectively eliminated, and the condition that the locking of an emergency lock catch is unreliable is avoided. Meanwhile, the modular design greatly simplifies the structure.

In the process of switching the state of the emergency locking device, the through hole, the step and the groove of the fixed seat 12 are matched with the first pin shaft 132 on the operating rod 13, so that the operating rod 13 can be effectively prevented from rotating to an abnormal position, and when the operating rod 13 rotates to a free and locked state, an obvious in-place sense prompt is provided, and misoperation is further avoided; in the process of switching the state of the emergency locking device, the transmission part 2 is separated from the transmission part 2 in the axial movement of the operation part 1 when the emergency locking device is in a locking position, the retraction of the operation part 1 does not influence the transmission part 2, and the locking reliability is higher.

Referring to fig. 2, 3 and 5, the operating portion 1 mainly includes a first mounting bracket 11, a fixing base 12 and an operating lever 13. The first mounting bracket 11 can be regarded as a breaker frame, the fixed seat 12 is fixedly mounted on the first mounting bracket 11 through a first screw 111, and the operating rod 13 can reciprocate in a linear motion in a hole formed by assembling the first mounting bracket 11 and the fixed seat 12, and is equivalent to a sliding block.

The operating part 1 further comprises a gasket 14 and a spring 15, wherein the gasket 14 is arranged on the operating rod 13 and used for stopping one end of the spring 15, the spring 15 is sleeved on the operating rod 13, and the other end of the spring is tightly pressed on an intermediate support 22 of the transmission part 2 and used for resetting the operating rod 13.

The operating rod 13 includes an operating handle 133, a first pin shaft 132, a long shaft 131, a first cotter 134, a pin 135 and a second cotter 136, the second cotter 136 is sleeved on the long shaft 131, the operating handle 133 is fixed at the shaft end of the long shaft 131, the movement of the long shaft 131 can be controlled by pressing and rotating the operating handle 133, the first pin shaft 132 is installed on the long shaft 131 through interference fit and is matched with an inner groove of the fixing seat 12 to control the rotation of the long shaft 131, the long shaft 131 penetrates through a hole formed by assembling the first installing support 11 and the fixing seat 12, the first cotter 134 is fixedly installed on the long shaft 131, one side of the first cotter 134 is a stop position of the gasket 14, the pin 135 radially penetrates through the long shaft 131, and is sleeved on the long shaft 131 through the second cotter 136.

Referring to fig. 3, 4 and 6, the transmission part 2 includes a second mounting bracket 21, an intermediate support 22 and a transmission shaft 23, the second mounting bracket 21 can be regarded as a breaker frame, the intermediate support 22 is fixedly mounted on the second mounting bracket 21 by a second screw 211, a spring 15 is arranged at one side of the intermediate support, a long shaft 131 is sleeved on the intermediate support 22, and the transmission shaft 23 is sleeved on the end of the long shaft 131. The transmission shaft 23 includes a sleeve 231 and a second pin 232, the sleeve 231 is sleeved on the end of the long shaft 131, the pin 135 penetrates through the sleeve 231 and the long shaft 131 in the radial direction, the pin 135 penetrates through the sleeve 231 and the long shaft 131 at the same time, and a kidney-shaped hole is formed in the sleeve 231, so that the sleeve 231 can only do linear motion on the long shaft 131, the axial motion distance is limited by the pin 135 and the kidney-shaped hole, and the second pin 232 is fixedly installed on the sleeve 231.

Referring to fig. 5, 6 and 7, in the process of switching the emergency lock from the automatic state to the locked state, since the first pin 132 on the long shaft 131 is still in the through hole engaged with the fixed seat 12, the operating handle 133 can only move linearly to push the gasket 14 to compress the spring 15; when the transmission part 2 is blocked by the release and cannot continuously compress the spring 15, the first pin shaft 132 on the long shaft 131 already slides out of the through hole matched with the fixed seat 12, and due to the limiting effect of the step of the fixed seat 12 on the first pin shaft 132, the operating handle 133 can only rotate in one direction, and the rotating range is limited within 90 degrees; when the operating handle 133 rotates, the first pin shaft 132 is limited by the step of the fixing base 12 along the axial movement of the long shaft 131, the spring force cannot be released, when the operating handle 133 rotates to 90 degrees, the first pin shaft 132 rotates into the groove corresponding to the fixing base 12, at the moment, the long shaft 131 can retreat under the action of the spring 15 until the first pin shaft 132 is limited by the groove of the fixing base 12, and the groove has the function of preventing the long shaft 131 from rotating and giving a prompt when the long shaft 131 is in place due to vibration and other reasons.

When the emergency latch of the operation part 1 is switched from the locked state to the free state, the operation handle 133 can only rotate in one direction due to the limiting effect of the step of the fixed seat 12 on the first pin shaft 132, when the operation handle 133 rotates for 90 degrees, the first pin shaft 132 rotates to the position matched with the through hole of the fixed seat 12, at the moment, the long shaft 131 can retract under the action of spring force until the first pin shaft 132 moves to the initial position of the through hole of the fixed seat 12, the operation process has foolproof performance, and only one method is provided for switching the state of the operation part 1, so that misoperation is avoided, and the reliability is high.

Referring to fig. 5, 6 and 7, the intermediate support 22 is fixed on the frame of the circuit breaker and supports the movement of the operating rod 13 during the process that the emergency latch is switched from the automatic state to the locked state in the transmission part 2; the sleeve 231 is pushed by the pin 135 to move linearly along the axial direction of the long shaft 131, and when the sleeve 231 is blocked by the release and cannot move forward, the operating handle 133 drives the sleeve 231 to rotate through the pin 135; after rotating a certain angle, the second pin 232 fixed on the sleeve 231 contacts with the step inclined plane of the middle support 22, and makes the sleeve 231 perform a spiral motion along the axial direction of the long shaft 131 under the action of the inclined plane, so as to further eliminate the movement gap of the trip unit. When the operating handle 133 is rotated to the home position, the second pin 232 is rotated to the step plane of the middle support 22, and the position of the sleeve 231 under the step plane of the middle support 22 is not changed. Because the sleeve 231 is matched with the pin 135 through a waist hole, the axial movement of the transmission part 2 is separated from the axial movement of the operation part 1, the retraction of the operation rod 13 does not affect the change of the position of the transmission shaft 23, and the movement chain of the locking release mechanism is reduced to the minimum and is very reliable.

During the process that the emergency lock is switched from the locking state to the free state, the operating rod 13 rotates the sleeve 231 through the pin 135 to make the second pin 232 leave the step plane of the intermediate support 22, when the operating rod 13 rotates to the right position, the second pin 232 is not blocked on the retraction path, and will retract to the initial position along with the operating rod 13 under the action of the pin 135.

The emergency locking device adopted by the invention shortens the moving chain, has the function of clearance compensation, has high reliability, does not depend on higher parts and assembly precision, and reduces the production cost. Meanwhile, the device is self-modularized, and can be installed in various circuit breakers needing the function after the shapes of parts are changed.

In conclusion, the emergency locking device for the circuit breaker has the functions of shortening a kinematic chain and eliminating a movement gap of a release through the separated design of the operation part 1 and the transmission part 2, and the reliability of the mechanism is improved; meanwhile, the state switching operation of the emergency locking device has fool-proof performance, misoperation is avoided, and the safety of the device is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides an emergent locking device for circuit breaker which characterized in that: the device comprises an operating part (1) and a transmission part (2) driven by the operating part (1), wherein the operating part (1) and the transmission part (2) are respectively fixed on a first mounting bracket (11) and a second mounting bracket (21), the operating part (1) comprises a fixed seat (12) arranged on the first mounting bracket (11) and an operating rod (13) which reciprocates linearly in a hole formed by the first mounting bracket (11) and the fixed seat (12), the transmission part (2) comprises a middle support (22) arranged on the second mounting bracket (21) and a spring (15) sleeved on the operating rod (13), one end of the spring (15) is stopped on a gasket (14) arranged on the operating rod (13), the other end of the spring is tightly pressed on the middle support (22) and used for resetting the operating rod (13), the operating rod (13) is sleeved on the middle support (22), the utility model discloses a spiral motion is made along its axis to sleeve shaft (23) in action bars (13) tip cover, action bars (13) including major axis (131) and fixed mounting first split pin (134) and pin (135) on major axis (131), one side end of first split pin (134) is located gasket (14), the axle head of major axis (131) is fixed with operating handle (133), action bars (13) and middle support (22) inclined plane's synergism drive sleeve (231) through action bars (13) and second round pin axle (232) of installing on sleeve (231) and be spiral motion, pin (135) radially run through sleeve (231) and major axis (131).

2. The emergency locking device for circuit breaker according to claim 1, wherein the long shaft (131) is provided with a first pin (132) by interference fit, and the first pin cooperates with an inner groove of the fixed base (12) to control the rotation of the long shaft (131).

3. The emergency locking device for circuit breaker according to claim 2, wherein the inner groove of the fixing base (12) is provided with a step for limiting the first pin (132).

4. An emergency locking device for a circuit breaker according to claim 1 wherein said sleeve (231) is provided with a kidney-shaped hole adapted to said pin (135).