CN111200254A

CN111200254A - Switch cabinet and secondary interlocking device thereof

Info

Publication number: CN111200254A
Application number: CN201911312037.7A
Authority: CN
Inventors: 汪宁; 张罗锐; 杜敬敬; 陈利民; 丛艳伟; 康世荣; 王爽; 吴登; 王茜; 柳俊岗
Original assignee: State Grid Corp of China SGCC; Pinggao Group Co Ltd; Tianjin Pinggao Intelligent Electric Co Ltd
Current assignee: State Grid Corp of China SGCC; Pinggao Group Co Ltd; Tianjin Pinggao Intelligent Electric Co Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-05-26
Anticipated expiration: 2039-12-18
Also published as: CN111200254B

Abstract

The invention relates to the field of electrical equipment, in particular to a switch cabinet and a secondary interlocking device thereof. The secondary interlock includes: a support; the lever is hinged to the support through a lever shaft, the extending direction of the lever shaft is perpendicular to the front-back direction in which the circuit breaker is pushed, and the lever comprises a driving arm and a driven arm, wherein the driving arm can be pushed by the circuit breaker; the locking piece is arranged on the driven arm; the elastic piece drives the locking piece to move towards the direction of separating from the secondary moving contact; the locking piece is movably assembled on the bracket in a guiding way, and the guiding moving direction of the locking piece is vertical to the plugging and unplugging direction of the secondary moving contact; the locking piece is provided with a limiting stop surface to prevent the secondary moving contact from being pulled out; the limiting stop surface extends along the moving direction of the locking piece. Even if the circuit breaker moves the stroke difference, can not take place the stroke short and unable locking, the easy dead circumstances of reverse locking of stroke length. The secondary interlocking device can be suitable for circuit breakers with different push-in strokes, and has a wider application range.

Description

Switch cabinet and secondary interlocking device thereof

Technical Field

The invention relates to the field of electrical equipment, in particular to a switch cabinet and a secondary interlocking device thereof.

Background

In the switch cabinet, a secondary plug (secondary moving contact) is arranged on a handcart type circuit breaker, electric information acquisition, transmission, electric control and detection circuits in the circuit breaker are collected on the secondary moving contact, and the secondary moving contact is connected with the circuit breaker through a wire. A secondary socket (secondary static contact) is fixed in the breaker chamber, and the secondary static contact is connected with a secondary electric loop. When the circuit breaker is at a test position, the secondary moving contact is inserted into the secondary static contact to perform test operation of a secondary circuit; when the circuit breaker continuously moves from the test position to the working position along the front-back direction, the secondary moving contact and the secondary static contact are kept connected, and the instrument room and the background connecting line acquire circuit measurement information in the circuit breaker through the secondary moving contact and the secondary static contact and control and execute transmission. In order to prevent the circuit breaker from being operated by mistake, the secondary moving contact and the secondary static contact are communicated when the circuit breaker is at the working position.

For this reason, chinese utility model patent that the publication number of granting is CN202872229U provides a put secondary plug locking interlock of cabinet in, and it specifically includes the support of installing on the indoor wall of circuit breaker, rotates through the lever axle on the support and installs the lever, the extending direction perpendicular to fore-and-aft direction of lever axle. The lever comprises a driving arm and a driven arm, a lock rod is fixed on the driven arm, and the whole lock rod is L-shaped. The secondary plug locking and interlocking device further comprises a spring, one end of the spring is connected to the support, the other end of the spring is connected to the lever, and when the lever is free of other acting forces except the spring, the spring keeps the locking rod at a high position above the secondary socket. During the use, the circuit breaker is when experimental position, inserts the secondary plug in the secondary socket along the fore-and-aft direction, and the circuit breaker is pushed operating position by experimental position, and the push rod on the circuit breaker overcomes the elastic force promotion lever of spring and swings, and the locking lever rotates the position that restriction secondary plug extracted together along with the lever, compresses tightly the secondary plug on the secondary socket, prevents to extract the secondary plug by mistake.

However, the secondary plug locking and interlocking device in the prior art has certain limitations in practical use: the swing position of the lock rod is determined by the swing angle of the lever and the position of the secondary plug, the lock rod is just in the position of pressing the secondary plug when the lever is pushed to the tail end by the breaker, and the tail end of the lever pushed and swung by the breaker is determined by the height of a push plate in the breaker. However, in practical use, because the circuit breaker manufacturer is not uniform in size, the height of the push plate is usually inconsistent, so that when the height of the push rod is low, the lever swings to the tail end, the lock rod cannot compress the secondary plug, and the easily-appearing consequence is as follows: the interval between the locking rod and the secondary plug is easy to be overlarge, and the secondary plug cannot be separated, but the risk of poor contact exists. If the push plate is higher, the push plate does not cross the lever, the lock rod swings to the position blocked by the secondary plug, the lever cannot swing continuously, and the normal pushing of the circuit breaker is influenced by the existence of the lever. In conclusion, the conventional secondary plug locking and interlocking device can only meet the use requirements of the circuit breaker with specific specification and size, and has strict size requirements on the circuit breaker and a narrow application range.

Disclosure of Invention

The invention aims to provide a secondary interlocking device for a switch cabinet, which aims to solve the technical problem that the application range of the secondary interlocking device in the prior art is narrow; the switch cabinet using the secondary interlocking device for the switch cabinet is further provided, so that the switch cabinet can be suitable for circuit breakers of different specifications.

In order to achieve the purpose, the technical scheme of the secondary interlocking device for the switch cabinet is as follows: a secondary interlock device for a switch cabinet, comprising:

a bracket for being mounted on an inner wall of the breaker chamber;

the lever is hinged to the support through a lever shaft, the extending direction of the lever shaft is perpendicular to the front-back direction in which the circuit breaker is pushed, and the lever comprises a driving arm and a driven arm, wherein the driving arm can be pushed by the circuit breaker;

the locking piece is arranged on the driven arm and used for limiting and locking the secondary moving contact;

the elastic piece drives the locking piece to move towards the direction of separating from the secondary moving contact, so that the secondary moving contact can be inserted into and pulled out of the secondary static contact;

the locking piece is movably assembled on the bracket in a guiding way, and the guiding moving direction of the locking piece is vertical to the plugging and unplugging direction of the secondary moving contact;

the locking piece is provided with a limiting stop surface which is used for being in stop fit with the secondary moving contact in the plugging direction of the secondary moving contact so as to prevent the secondary moving contact from being pulled out;

the limiting stop surface extends along the moving direction of the locking piece.

The invention has the beneficial effects that: the moving direction of the locking piece is perpendicular to the plugging direction of the secondary moving contact, and the locking piece is provided with a limiting stop surface extending along the moving direction of the locking piece. The locking piece only has the effect of limiting and stopping the secondary moving contact, but does not have the effect of pressing the secondary moving contact along the plugging direction of the secondary moving contact. As long as the locking piece and the secondary moving contact have an overlapping part in the plugging direction of the secondary moving contact, the secondary moving contact is limited. For the circuit breakers of different specifications and models, even if the moving strokes are different, the situations that the circuit breakers cannot be locked due to short strokes and are easy to reversely lock due to long strokes can not occur. And because the circuit breaker is a pushing lever driving arm, the swing angle of the lever is larger during initial pushing, and the swing angle of the later pushing lever is smaller, so that the stroke of the locking piece moving in the early stage is larger, and the stroke of the locking piece moving in the later stage is smaller. In conclusion, on the premise of meeting the use requirements, the secondary interlocking device can be suitable for circuit breakers with different push-in strokes, and is wider in application range.

Further, the extending direction of the lever shaft is the up-down direction, and the secondary interlocking device further comprises:

the pushing piece extends up and down, is assembled on the support in a guiding and moving mode along the front-back direction, and is provided with a driving arm pushing end matched with the side portion of the driving arm in a pushing mode and a panel pushing end capable of being pushed by a panel of the circuit breaker in the front-back direction. After the pushing piece is arranged, the circuit breaker pushes the lever to rotate through the pushing piece, the lever cannot be directly impacted, and subsequent maintenance and replacement are facilitated.

Further, the elastic part comprises a pushing part return spring, and the pushing part return spring is connected between the support and the pushing part.

Further, a secondary static contact mounting structure is arranged on the support and located on one side of the support in the front-back direction, the secondary static contact mounting structure faces the secondary moving contact and is used for fixedly mounting the secondary static contact. Set up secondary static contact mounting structure on the support, install the secondary static contact on the support during use for the position of secondary static contact and each part is more accurate, is convenient for realize modular design and processing, can be applicable to the cubical switchboard of different specification models.

Furthermore, the driven arm is hinged with a connecting rod, and the other end of the connecting rod is hinged with the locking piece. The driven arm is connected with the locking piece through the connecting rod, and the locking piece is prevented from being clamped and blocked in the driving process.

Furthermore, the locking piece comprises a guide plate, the guide plate is movably assembled on the support in a guiding mode, the guide plate is hinged to the connecting rod, the locking piece further comprises a locking plate arranged in parallel with the guide plate, the locking plate and the guide plate are arranged at intervals through a connecting plate, the connecting plate extends in the plugging direction of the secondary moving contact, and the side face of one side, facing the secondary moving contact, of the locking plate forms the limiting stop face.

Further, the elastic member includes a guide plate return spring connected between the guide plate and the bracket.

Furthermore, a limiting guide groove is formed in the support, the end portion of the driving arm extends into the limiting guide groove, and the limiting guide groove is used for limiting and guiding the swinging of the driving arm. The limit guide groove carries out limit guide on the driving arm, so that the swinging of the driving arm and the lever is more stable and accurate.

Further, the support is the box body of spiral-lock on the indoor wall of circuit breaker, lever shaft arrange in the box body, be equipped with the access way that accesss to the box body inside on the box bottom of box body. After the maintenance channel is arranged, an operator can maintain and manually operate each part in the box body without integrally disassembling the support.

The technical scheme of the switch cabinet is as follows: a switchgear cabinet comprising:

the circuit breaker comprises a circuit breaker chamber, wherein a secondary static contact is fixedly arranged on the inner wall of the circuit breaker chamber;

the circuit breaker is connected with a secondary moving contact through a wire and pushed into the circuit breaker chamber along the front-back direction;

the cubical switchboard still includes:

secondary interlock for cubical switchboard sets firmly on the inner wall of circuit breaker room, and secondary interlock for cubical switchboard includes:

a bracket for being mounted on an inner wall of the breaker chamber;

The elastic part comprises a pushing part return spring, and the pushing part return spring is connected between the support and the pushing part.

Drawings

FIG. 1 is a schematic view of an embodiment of a switchgear of the present invention in a test position;

FIG. 2 is a schematic view of an embodiment of a switchgear of the present invention in an operating position;

FIG. 3 is a perspective view of a secondary interlock device during travel of a circuit breaker in an embodiment of a switchgear of the present invention;

FIG. 4 is a top view of a secondary interlock device during travel of a circuit breaker in an embodiment of a switchgear of the present invention;

FIG. 5 is a front view of a secondary interlock device during travel of a circuit breaker in an embodiment of a switchgear of the present invention;

FIG. 6 is a perspective view of the device mounting box of FIG. 3;

FIG. 7 is a schematic view of the locking member of FIG. 3;

FIG. 8 is a schematic view of the limiting plate of FIG. 3;

FIG. 9 is a schematic view of the guide shoe of FIG. 3 from a first perspective;

FIG. 10 is a second perspective view of the guide shoe of FIG. 3;

fig. 11 is a schematic view of a secondary interlocking device before a secondary moving contact and a secondary fixed contact are not inserted into each other in an embodiment of the switch cabinet of the invention;

FIG. 12 is a top view of a secondary interlock device in a switchgear embodiment of the present invention with the circuit breaker in the operating position (springs not shown);

FIG. 13 is a front view of a secondary interlock device in an embodiment of a switchgear of the present invention with the circuit breaker in the operating position (springs not shown);

FIG. 14 is a diagram illustrating a comparison between the moving distance of the locking member and the moving distance of the pushing member during the switching of the states in the embodiment of the switchgear of the present invention;

FIG. 15 is a schematic view of the transmission member of the secondary interlocking device in the embodiment of the switch cabinet of the present invention;

FIG. 16 is an enlarged view taken at A in FIG. 15;

description of reference numerals: 1-a bus bar chamber; 2-a cable chamber; 3-a circuit breaker chamber; 4-a circuit breaker; 5-electric control (instrument) room; 6-a secondary interlock; 7-a panel; 8-device mounting box; 81-mounting holes; 82-perforating; 83-box bottom; 9-a lever shaft; 10-a limiting guide groove; 11-maintenance channel; 12-a connecting rod; 13-a first spring; 14-a lock; 141-a guide plate; 142-a connecting plate; 143-a locking plate; 144-a first ear plate; 15-a lever; 16-a second spring; 17-the master arm; 18-a follower arm; 19-secondary moving contact; 20-secondary static contact; 21-pushing the piece; 211-guide slide; 2111-slider body; 2112-mounting a pole; 2113-bayonet; 2114-third otic placode; 2115-connecting block; 212-a mandril; 22-a limiting plate; 221-a fixing plate; 222-a second ear panel; 23-a pilot hole; and 24, guiding a fixing plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

The specific embodiment of the switch cabinet of the invention is as follows:

as shown in fig. 1 to 16, the switchgear includes a cabinet body in which a circuit breaker chamber 3, a bus bar chamber 1, a cable chamber 2, and an electrical control (instrument) chamber 5 are provided, wherein the circuit breaker chamber 3 extends forward and backward for pushing in and out a circuit breaker 4. A secondary static contact 20 is fixed on the inner wall of the breaker chamber 3, and the secondary static contact 20 is connected with an electrical control (instrument) chamber 5; the circuit breaker 4 is provided with a secondary moving contact 19 through a wire, the secondary moving contact 19 can have a certain movement amount relative to the circuit breaker 4, and the secondary moving contact can be inserted with a secondary static contact 20 no matter the circuit breaker 4 is in a test position or a working position.

When the circuit breaker 4 is in the working position, in order to avoid the secondary moving contact 19 and the secondary static contact 20 from being separated, the secondary interlocking device 6 is installed in the circuit breaker chamber 3, and the secondary moving contact 19 is locked by matching with the panel 7 on the circuit breaker 4, so that the secondary moving contact and the secondary static contact are prevented from being separated.

As shown in fig. 3 to 13, which are specific structures of the secondary interlock device 6, the secondary interlock device 6 includes a device mounting box 8, the device mounting box 8 is fastened on the top inner wall of the breaker chamber 3 during assembly, a lever 15 is rotatably mounted on a box bottom 83 of the device mounting box 8 through a lever shaft 9, and the lever 15 is rotatably mounted on the lever shaft 9 at a middle position. One end of the lever 15 is a driving arm 17, the other end is a driven arm 18, a connecting rod 12 is hinged on the driven arm 18, the other end of the connecting rod 12 is hinged with a locking piece 14, wherein the locking piece 14 is assembled on the device mounting box 8 in a guiding and moving mode, and the guiding and moving direction of the locking piece 14 is perpendicular to the extending direction of the lever shaft 9. A guide hole 23 is further formed in the case bottom 83 of the device mounting case 8, and the extending direction of the guide hole 23 is perpendicular to the guiding moving direction of the lock member 14 and the extending direction of the lever shaft 9. A pushing piece 21 is installed in the guiding hole 23, the pushing piece 21 penetrates through the box bottom 83 of the device installation box 8, and the pushing piece 21 is pushed by the panel 7 of the breaker 5 and pushes the active arm 17 of the lever 15 to swing so as to drive the locking piece 14 to move.

Specifically, as shown in fig. 6, the device mounting box 8 is integrally in the shape of an open box, the device mounting box 8 includes a box bottom 83, a flange is provided at the edge of the device mounting box 8, a mounting hole is provided on the flange, and the flange is directly fastened to the top wall of the breaker chamber 3 during assembly. Wherein, the guide hole 23 has been seted up on the box bottom of device mounting box 8, has still seted up mounting hole 81, and the guide hole 23 is the slot hole of sharp extension, and mounting hole 81 is linked together with guide hole 23, and the aperture of mounting hole 81 is greater than the aperture of guide hole 23 moreover, and wherein, guide hole 23 extends along the fore-and-aft direction. The guide hole 23 functions to guide the movement of the guide slider 211 in cooperation with the guide slider 211. The mounting hole 81 is for receiving the guide slider 211, and the guide slider 211 is clipped to the cassette bottom 83 through the mounting hole 81. A limiting guide groove 10 is formed in the side wall of one side of the device mounting box 8, the limiting guide groove 10 is a long groove extending in the left-right direction, and the limiting guide groove 10 is used for allowing an active arm 17 of the lever 15 to extend into and limiting the swing of the active arm 17. A through hole 82 is formed in the other side wall of the device mounting box 8 opposite to the side wall, the through hole 82 is a long hole extending in the left-right direction, and the through hole 82 is used for the connection plate 142 in the locking member 14 to pass through without affecting the normal movement of the connection plate 142.

As shown in fig. 6, various mounting holes are formed in the case bottom 83, for example, a mounting hole for mounting the guide fixing plate 24, a mounting hole for mounting the stopper plate 22, and a mounting hole for mounting the lever shaft 9, and a mounting hole for mounting the secondary stationary contact 20 and a through hole through which the guide plate 141 of the lock 14 passes are formed in a side wall of the apparatus mounting case 8.

As shown in fig. 6, a notch is formed at one corner of the box bottom 83 to form an access passage 11, and the access passage 11 is used for an operator to access and manually operate components such as the lever 15 inside the device mounting box 8.

The locking member 14 is structured as shown in fig. 7, the locking member 14 is used for performing a blocking engagement with the secondary moving contact 19, so as to prevent the secondary moving contact 19 from separating from the secondary stationary contact 20, and the locking member 14 is controlled by the lever 15, the connecting rod 12 and the first spring 13. The locking member 14 has a plate-shaped structure as a whole, and the locking member 14 includes a guide plate 141, a connecting plate 142 at a position near the middle of the guide plate 141, and a locking plate 143 at an end of the connecting plate 142, wherein, as shown in fig. 7, the extending direction of the guide plate 141 coincides with the extending direction of the locking plate 143, and the extending direction of the connecting plate 142 is perpendicular to both. The locking plate 143 is used for blocking the secondary moving contact 19, and after the assembly, the locking plate 143 is located outside the device mounting box 8; most of the guide plate 141 is located inside the device mounting box 8, and a part of the end part of the guide plate passes through the device mounting box 8; the connection plate 142 extends through the apparatus mounting case 8. The guide plate 141 is fixed with a first ear plate 144, the first ear plate 144 is provided with a hole for connecting the first spring 13, and the guide plate 141 is also provided with a hole for connecting the connecting rod 12. The locking member 14 is formed by integral molding, and other embodiments may be welding.

Referring to the guide slider 211, the guide slider 211 is constructed as shown in fig. 9 and 10, the guide slider 211 includes a slider body 2111, the slider body 2111 is i-shaped to form a bayonet 2113, a mounting rod 2112 is fixed to one side of the slider body 2111, a connecting block 2115 is fixed to the other side of the slider body 2111, a third ear plate 2114 is fixed to the slider body 2111, and the third ear plate 2114 is provided with a connecting hole for connecting the second spring 16. The end of the connecting block 2115 is provided with a threaded hole for threaded connection with the mandril 212. The mounting bar 2112 is used for fixing the sleeved nylon sleeve, and one end of the mounting bar 2112 is used for pushing the driving arm 17.

The secondary interlocking device 6 further comprises a limiting plate 22, the structure of the limiting plate 22 is shown in fig. 8, the limiting plate 22 comprises a fixing plate 221 and a second lug plate 222, wherein the fixing plate 221 is provided with a mounting hole for fixing the limiting plate 22 on the box bottom 83. The attachment hole in the second ear plate 222 is used to attach the second spring 16.

As shown in fig. 4, the secondary interlock device 6 further includes two guide fixing plates 24, two guide fixing plates 24 are provided, the guide fixing plates 24 have guide holes therein, and have a shape corresponding to the guide plates 141, and the two guide fixing plates 24 are spaced apart from each other in a direction along the guide plates 141 to guide the movement of the guide plates 141.

In this embodiment, as shown in fig. 3, 4, 5, 11, 12, and 13, after the components are assembled, the lever 15 is rotatably mounted on the device mounting box 8 through the lever shaft 9, the guide hole 23 is located at one side of the lever shaft 9, the pushing member 21 is slidably mounted in the guide hole 23, the inner end located inside the device mounting box 8 is pushed against the driving arm 17, and the outer end is located outside the device mounting box 8. The second spring 16 is connected between the pushing piece 21 and the limit plate 22. The driven arm 18 is connected with the connecting rod 12 in an articulated mode, the connecting rod 12 is connected with the locking piece 14 in an articulated mode, and the locking piece 14 is restrained by two guide fixing plates 24 to move in a guide mode. A first spring 13 is arranged between the locking piece 14 and the guide fixing plate 24. The secondary stationary contact 20 is fixed on one side of the device mounting box 8.

The structure of the secondary interlock device 6 assembled to the breaker chamber 3 is shown in fig. 1, 2, 3, 4, and 5, in which the direction perpendicular to the paper in fig. 4 is the vertical direction of the breaker, the horizontal direction in fig. 4 is the front-rear direction of the breaker, and the pushing direction of the breaker is from left to right. The secondary stationary contact 20 is located on one side in the front-rear direction of the device mounting case 8 and faces the opening of the breaker chamber 3.

The ejector rod 212 is located below the device mounting box 8 and used for pushing the panel 7, after the panel 7 pushes the ejector rod 212, the ejector rod 212 moves to push the lever 15 to swing anticlockwise, and the lever 15 drives the locking piece 14 to move horizontally through the connecting rod 12.

The using process of the invention is as follows: the circuit breaker 4 is pushed into the circuit breaker chamber 3, and when the circuit breaker 4 is in the test position shown in fig. 1, the secondary movable contact 19 is inserted into the secondary stationary contact 20 in the front-rear direction, and at this time, the secondary interlock device 6 is in the state shown in fig. 4 and 5. The circuit breaker 4 is continuously pushed into the circuit breaker chamber 3, the panel 7 on the circuit breaker 4 impacts and pushes the ejector rod 212, the ejector rod 212 moves in the front-back direction and drives the lever 15 to rotate anticlockwise, the lever 15 drives the locking piece 14 to move in the left-right direction through the connecting rod 12, the locking plate 143 in the locking piece 14 is arranged on one side, back to the secondary static contact 20, of the secondary moving contact 19, and can be in blocking fit with the secondary moving contact 19 to prevent the secondary moving contact 19 from being pulled out of the secondary static contact 20. At this time, the secondary interlock device 6 is in the state shown in fig. 12 and 13. When the circuit breaker 4 is pulled out, the locking member 14 moves reversely under the elastic tension of the first spring 13, and the pushing member 21 moves reversely under the elastic tension of the second spring 16, returning to the state shown in fig. 4 and 5, at which time the circuit breaker 4 is in the testing position, and the secondary movable contact 19 can be pulled out.

In the invention, the blocking of the secondary moving contact 19 is realized by adopting a mode that the lever 15 drives the locking piece 14 to move, and besides the function of realizing basic locking misoperation prevention, the secondary interlocking device has the advantage of wider application range and can be suitable for circuit breakers with different push-in strokes. The push-in strokes of circuit breakers of different manufacturers and different specifications from the test position to the working position are different, on one hand, the circuit breaker 4 with a short push-in stroke needs to be ensured to be capable of driving the locking piece 14 to move to a position capable of blocking the secondary moving contact 19; on the other hand, it is necessary to ensure that the locking member 14 is not stopped and pressed by the secondary moving contact 19 before the breaker 4 with a long push-in stroke is pushed into the working position, so that the breaker 4 cannot be pushed into place.

The reason why the secondary interlock device of the present invention can accommodate circuit breakers 4 having different push-in strokes is that, as shown in fig. 14, state 1 refers to the state of the secondary interlock device when the circuit breaker is at the test position, state 2 refers to the state of the secondary interlock device when the circuit breaker is at the operating position, and state 3 refers to the state of the secondary interlock device after the circuit breaker has moved over its stroke. In fig. 14, H3 is the moving stroke of the circuit breaker 4 in the state 1 to the state 2, H4 is the moving stroke of the circuit breaker 4 in the state 2 to the state 3, and H3 is equal to H4. H1 is the moving distance of the latch 14 during State 1 to State 2, and H2 is the moving distance of the latch 14 during State 2 to State 3. As can be seen from the comparison of fig. 14 and actual measurement, the moving distance of the lock member 14 in the second half is 1/10 of the moving distance of the lock member 14 in the first half under the same circuit breaker moving stroke. The principle is that, as shown in fig. 15 and 16, L is the advance stroke of the circuit breaker, H is the vertical distance between the lever shaft 9 and the ejector 21, and X is the rotation angle of the lever, where tanX is L/H, and the variation relationship of the rotation angle X is the arctangent function, and according to the graph of the arctangent function, the unit change rate is large in the early stage, and the change of the rotation angle X is slight even if the advance stroke L of the circuit breaker is gradually increased in the later stage, so that the above phenomenon occurs.

The invention utilizes the principle that the earlier stroke displacement of the circuit breaker in the secondary interlocking device has larger influence on the displacement of the locking piece and the later stroke of the circuit breaker has smaller influence on the displacement of the locking piece, and can be suitable for the circuit breakers with different push-in strokes. Wherein, most circuit breaker stroke all designs within state 2 on the market, and few non-standard products can surpass state 2 and be state 3, even non-standard circuit breaker appears, according to foretell principle, need not carry out non-standard design, and in unnecessary circuit breaker stroke, the displacement variable of locking piece is very little. In this embodiment, the situation that the secondary interlocking device intercepts the circuit breaker in the reverse direction will not occur only by ensuring that the locking plate 143 has a sufficient length.

In this embodiment, the device mounting box 8 is the box body, and there is the breach in the one corner of the box bottom 83 of box body and forms the access way, and this is for overhaul and manual operation and set up, in other embodiments, can cancel the access way for the whole closed structure that is of box body.

In this embodiment, the guiding plate 141, the connecting plate 142, the locking plate 143 and the first ear plate 144 together form a locking member, and in other embodiments, the shapes of the guiding plate, the connecting plate and the locking plate may be changed according to practical situations, such as being configured as a rod-shaped or block-shaped structure.

In this embodiment, the side of the locking plate 143 of the locking member facing the secondary moving contact 19 is a limit stop surface, which extends along the locking member. In other embodiments, the moving direction of the locking member and the orientation of the limiting stop surface are adjusted according to the plugging and unplugging direction of the secondary moving contact and the secondary stationary contact, for example, when the plugging and unplugging direction of the secondary moving contact and the secondary stationary contact is an up-down direction, the limiting stop surface is located in the up-down direction of the locking member.

In this embodiment, the follower arm 18 is connected to the latch member 14 via the link 12, but in other embodiments, the link may be eliminated and the follower arm and the latch member may be directly hinged.

In this embodiment, the mounting hole for mounting the secondary static contact 20, which is formed on the side wall of the device mounting box 8, forms a secondary static contact mounting structure, and in other embodiments, the secondary static contact mounting structure may be a claw arranged on the device mounting box, and the secondary static contact is clamped and mounted on the device mounting box.

In this embodiment, the secondary moving contact 19 and the secondary stationary contact 20 are both used as a part of the secondary interlocking device, in other embodiments, the secondary moving contact and the secondary stationary contact may not be used as a part of the secondary interlocking device, and the secondary moving contact and the secondary stationary contact exist independently of the secondary interlocking device, so that the use requirement can be met only by ensuring the position relationship between the secondary interlocking device and the secondary stationary contact.

In this embodiment, the first spring 13 is connected between the guide plate and the device mounting case to form a guide plate return spring, and the second spring 16 is connected between the pushing member and the limiting plate 22, and may be considered as being indirectly connected between the pushing member and the device mounting case to form a pushing member return spring. The guide plate return spring and the pushing piece return spring form an elastic piece together, and the elastic piece is used for driving the locking piece to move towards the direction of separating from the secondary moving contact. In this embodiment, deflector reset spring and top push member reset spring are the extension spring, and in other embodiments, can change for the pressure spring, perhaps other structures like the rubber tape etc.. In other embodiments, the pusher return spring may be eliminated.

In this embodiment, one end of the pushing member, which is in pushing fit with the active arm, is a driving arm pushing end, one end of the pushing member, which is in pushing fit with the panel of the circuit breaker, is a panel pushing end, and the panel pushing end is formed on the top rod 212.

In this embodiment, the locking member includes both the guiding plate and the locking plate, and in other embodiments, the guiding member and the locking member may be one. In this embodiment, the lock member translates in the left-right direction.

In this embodiment, the extending direction of lever axle is upper and lower direction, in order to make the convenient top of circuit breaker push away the lever, has set up the ejecting piece in addition, in other embodiments, also can cancel the ejecting piece for the circuit breaker directly pushes away the lever.

In other embodiments, the translational direction of the locking member and the extension direction of the lever shaft are adjusted according to the plugging and unplugging directions of the secondary moving contact and the secondary static contact. For example, when the plugging direction of the secondary moving contact and the secondary static contact is the front-back direction, the lever shaft extends up and down, and the locking piece translates left and right or front-back; or the lever shaft extends in the left-right direction, and the locking piece translates up and down. For another example, when the plugging direction of the secondary moving contact and the secondary static contact is the up-down direction, the lever shaft extends up and down, and the locking piece translates left and right or front and back; or the lever shaft extends left and right, and the locking piece translates in the front-back direction. For another example, when the plugging direction of the secondary moving contact and the secondary static contact is the left-right direction, the lever shaft extends up and down, and the locking piece translates back and forth; or the lever shaft extends left and right, and the locking piece translates up and down. In summary, the final purpose of the present invention is to achieve translational movement of the locking member to lock the secondary moving contact, based on which the extending direction of the lever shaft and the translational direction of the locking member can be adjusted according to the inserting and pulling direction of the secondary moving contact, and it should be noted that the connection manner between the driven arm and the locking member can be redesigned and changed according to the actual situation.

In this embodiment, the device mounting box forms a cradle which is mounted on the top wall of the circuit breaker chamber, and in other embodiments, the structure of the cradle may be changed, for example, a frame-type structure. In addition, the bracket can be fixed on the side wall of the breaker chamber under the condition that the wiring is allowed.

In the specific embodiment of the secondary interlocking device for the switch cabinet, the structure of the secondary interlocking device for the switch cabinet is consistent with that of the secondary interlocking device in the above embodiment, and details are not repeated herein.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.

Claims

1. A secondary interlock device for a switch cabinet, comprising:

a bracket for being mounted on an inner wall of the breaker chamber;

the method is characterized in that:

2. The secondary interlock device for a switchgear according to claim 1, characterized in that: the extending direction of the lever shaft is the up-down direction, and the secondary interlocking device further comprises:

the pushing piece extends up and down, is assembled on the support in a guiding and moving mode along the front-back direction, and is provided with a driving arm pushing end matched with the side portion of the driving arm in a pushing mode and a panel pushing end capable of being pushed by a panel of the circuit breaker in the front-back direction.

3. The secondary interlock device for a switch cabinet according to claim 2, characterized in that: the elastic part comprises a pushing part return spring, and the pushing part return spring is connected between the support and the pushing part.

4. The secondary interlocking device for the switch cabinet according to claim 2 or 3, characterized in that: the support is provided with a secondary static contact mounting structure, the secondary static contact mounting structure is located on one side of the support in the front-back direction, the secondary static contact mounting structure faces the secondary moving contact and is used for fixedly mounting a secondary static contact.

5. The secondary interlock device for a switchgear according to claim 1, 2 or 3, characterized in that: the driven arm is hinged with a connecting rod, and the other end of the connecting rod is hinged with the locking piece.

6. The secondary interlock device for a switch cabinet according to claim 5, characterized in that: the locking piece comprises a guide plate, the guide plate is movably assembled on the support in a guide mode, the guide plate is hinged to the connecting rod, the locking piece further comprises a locking plate arranged in parallel with the guide plate, the locking plate and the guide plate are arranged at intervals through a connecting plate, the connecting plate extends in the inserting and pulling direction of the secondary moving contact, and the side face of one side, facing the secondary moving contact, of the locking plate forms the limiting stop face.

7. The secondary interlock device for a switch cabinet according to claim 6, characterized in that: the elastic part comprises a guide plate return spring, and the guide plate return spring is connected between the guide plate and the support.

8. The secondary interlock device for a switchgear according to claim 1, 2 or 3, characterized in that: the support is provided with a limiting guide groove, the end part of the driving arm extends into the limiting guide groove, and the limiting guide groove is used for limiting and guiding the swing of the driving arm.

9. The secondary interlock device for a switchgear according to claim 1, 2 or 3, characterized in that: the support is the box body of spiral-lock on the indoor wall of circuit breaker, lever shaft arrange in the box body, be equipped with the maintenance passageway that accesss to the box body inside on the box body's the box bottom.

10. A switchgear cabinet comprising:

the method is characterized in that: the cubical switchboard still includes:

the secondary interlocking device for the switch cabinet is fixedly arranged on the inner wall of the breaker chamber, and the secondary interlocking device for the switch cabinet is the secondary interlocking device for the switch cabinet as claimed in any one of claims 1 to 9.