An interlocking device among a circuit breaker, a three-position switch and a cable chamber door

Abstract

An interlocking device between a circuit breaker, a three-position switch and a cable chamber door disclosed by the present invention includes a three-position locking structure, a circuit breaker connection and locking structure, and a cable chamber door locking structure. It is characterized in that it further includes a first interlocking rod and a second interlocking rod of a rigid structure. The three-position locking structure realizes a hard connection interlock with the circuit breaker connection and locking structure through the first interlocking rod, and the circuit breaker connection and locking structure realizes a hard connection interlock with the cable chamber door locking structure through the second interlocking rod. The present invention is used for the mechanical interlock between the circuit breaker, the three-position switch and the cable chamber door of a switch cabinet, and can realize the logical interlock among the three. It basically solves the problems of the traditional soft wire drawing interlocking structure, such as the wire drawing getting stuck, the action not in place, or the action becoming inflexible after a long time. It realizes the hard connection of the interlock of each functional component, and greatly improves the reliability of the interlock.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-insulated switchgear, and particularly to a hard connection interlock device for interlocking the relationships among a three-position switch, a circuit breaker, and a cable chamber door in a gas-insulated switchgear, and more particularly to an interlock device between a circuit breaker, a three-position switch, and a cable chamber door. Background Art

[0002] Gas-insulated metal-enclosed switchgear has been gradually accepted by users in recent years due to its good insulation performance, sealing performance, and small floor area, and has been widely used. More and more substations and medium-voltage users with large capacity need this kind of highly reliable, maintenance-free, miniaturized, and environmentally unaffected C-GIS box-type gas-insulated metal-enclosed switchgear. Among them, vacuum circuit breakers and three-position switches are used in gas-insulated switch cabinets. When in use, there must be a five-prevention interlock structure among the vacuum circuit breaker, the three-position switch, and the cable chamber door. Since the positions of these three components are scattered, a flexible cable-type interlock structure is generally used. The cable structure has problems such as jamming and improper operation, and there must be a logical interlock among the three. At this time, a reliable hard connection interlock device is needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an interlock device between a circuit breaker, a three-position switch, and a cable chamber door to solve the problems of jamming and improper operation existing in the current flexible cable-type interlock structure between the three-position switch and the cable chamber door, and its various parts can move flexibly and consistently, and can achieve logical interlock among the three, basically solving the problems of the traditional flexible cable interlock structure.

[0004] The technical problem to be solved by the present invention can be achieved through the following technical solutions:

[0005] An interlock device between a circuit breaker, a three-position switch, and a cable chamber door includes a three-position locking structure, a circuit breaker connection and locking structure, and a cable chamber door locking structure, and is characterized in that it further includes a first interlock rod and a second interlock rod of a rigid structure. The three-position locking structure realizes hard connection interlock with the circuit breaker connection and locking structure through the first interlock rod, and the circuit breaker connection and locking structure realizes hard connection interlock with the cable chamber door locking structure through the second interlock rod.

[0006] In a preferred embodiment of the present invention, the power input end of the first interlock rod is interlocked with the three-position locking structure, and the power output end of the first interlock rod is interlocked with the circuit breaker connection and locking structure; the power input end of the second interlock rod is interlocked with the circuit breaker connection and locking structure, and the power output end of the second interlock rod is interlocked with the cable chamber door locking structure.

[0007] In a preferred embodiment of the present invention, the three-position locking structure includes:

[0008] A positioning shaft installed on the indicating disk of the three-position switch, which is used to output the position state of the three-position switch;

[0009] A three-position interlocking plate axially arranged on the three-position switch, and the three-position interlocking plate rotates between a locking limit position and an unlocking limit position;

[0010] A locking limit post installed at the locking limit position of the three-position switch, which is used to limit the locking limit position of the three-position interlocking plate;

[0011] A locking limit post installed at the unlocking limit position of the three-position switch, which is used to limit the unlocking limit position of the three-position interlocking plate;

[0012] A three-position interlocking plate return spring, one end of the three-position interlocking plate return spring is connected to the mechanism bracket of the three-position switch, and the other end is connected to the three-position interlocking plate. This three-position interlocking plate return spring is used to drive the three-position interlocking plate to return from the unlocking limit position to the locking limit position;

[0013] In a preferred embodiment of the present invention, the breaker connection and locking structure is installed inside the breaker side plate, and it includes:

[0014] A linkage plate, which is movably installed on the breaker side plate and can move up and down;

[0015] A main shaft linkage plate installed on the main output shaft of the breaker and rotating synchronously with the main output shaft of the breaker. When the breaker is in the closed position, the linkage plate is released to move up and down. When the breaker is in the open position, the linkage plate is locked to prevent it from moving up and down;

[0016] A first pull rod fixing block installed on the linkage plate, and the power output end of the first interlocking rod is adjustably connected to the first pull rod fixing block to adjust the height position of the first interlocking rod;

[0017] A second pull rod fixing block installed on the linkage plate, and the power input end of the second interlocking rod is adjustably connected to the second pull rod fixing block to adjust the height position of the second interlocking rod;

[0018] A breaker electric opening control switching switch, which is installed on the side plate of the breaker. When the linkage plate is lifted and unlocked, the breaker electric opening control switching switch is cut off. At this time, the breaker electric opening control is disconnected and electric opening cannot be performed.

[0019] In a preferred embodiment of the present invention, the cable chamber door locking structure includes:

[0020] A locking pin installed on the power output end of the second interlocking rod;

[0021] A locking tongue installed on the cable chamber door, which is locked by inserting the locking pin;

[0022] A locking pin baffle installed in the cable chamber. The locking pin baffle is lifted to unlock under the action of the locking pin baffle return spring, pushing out the locking tongue to open the cable chamber door and blocking the locking pin to prevent it from falling.

[0023] In a preferred embodiment of the present invention, the cable chamber door locking structure further includes:

[0024] A locking pin guiding housing installed in the cable chamber. The locking pin baffle is installed in the locking pin guiding housing. The locking pin guiding housing guides the locking pin and the locking pin baffle, so that the locking pin can accurately insert into the locking tongue hole on the locking tongue and ensure the correct movement of the locking pin baffle; One end of the locking pin baffle return spring is connected to the locking pin baffle, and the other end is connected to the locking pin guiding housing.

[0025] Due to the adoption of the above technical solutions, the present invention relates to an interlocking device between a circuit breaker, a three-position switch and a cable chamber door, which is used for mechanical interlocking between the circuit breaker, the three-position switch and the cable chamber door of a switch cabinet, and can realize logical interlocking among the three. Basically, it solves the problems of jamming of the pull wire in the traditional soft pull wire interlocking structure, the action not being in place, or the action becoming inflexible after a long time. It realizes the hard connection of the interlocking of each functional component, and greatly improves the reliability of the interlocking. Brief Description of the Drawings

[0026] Figure 1 It is the front view of the interlocking device between the circuit breaker, the three-position switch and the cable chamber door of the present invention.

[0027] Figure 2 It is the side partial cross-sectional view of the interlocking device between the circuit breaker, the three-position switch and the cable chamber door of the present invention.

[0028] Figure 3 It is the schematic diagram of the interlocking device between the circuit breaker, the three-position switch and the cable chamber door of the present invention in the circuit breaker tripped state.

[0029] Figure 4 It is the schematic diagram of the interlocking device between the circuit breaker, the three-position switch and the cable chamber door of the present invention in the circuit breaker closed state. Detailed Embodiment

[0030] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0031] See Figure 1 and Figure 2, the interlocking device between a circuit breaker, a three-position switch and a cable room door shown in the figure includes a three-position locking structure 10, a circuit breaker connection and locking structure 20 and a cable room door locking structure 30.

[0032] Compared with the current soft pull-wire interlocking structure between the three-position locking structure 10, the circuit breaker connection and locking structure 20 and the cable room door locking structure 30, which has the problem of sticking and inadequate action of the pull-wire structure, the present invention proposes a hard-connected interlocking method between the three-position locking structure, the circuit breaker connection and locking structure and the cable room door locking structure to achieve five-protection interlocking between the circuit breaker, the three-position switch and the cable room door.

[0033] The specific core solutions are as follows:

[0034] The three-position locking structure 10 realizes hard connection interlocking with the circuit breaker connection and locking structure 20 through the first interlocking rod 40 , and the circuit breaker connection and locking structure 20 realizes hard connection interlocking with the cable room door locking structure 30 through the second interlocking rod 50 .

[0035] The three-station locking structure 10 includes a positioning shaft 11 , a three-station interlocking plate 12 , a locking limit column 13 , an unlocking limit column 14 and a three-station interlocking plate restoring spring 15 .

[0036] The positioning shaft 11 is mounted on the indicator plate 61 of the three-position switch 60, and the positioning shaft 11 rotates with the indicator plate 61 to output the position state of the three-position switch 60. When the positioning shaft 11 rotates with the indicator plate 61, it can contact the three-position interlocking plate 12 to drive the three-position interlocking plate 12 to rotate to the unlocking limit position, or it can be disconnected from the three-position interlocking plate 12, so that the three-position interlocking plate 12 is reset to the limit locking position under the action of the three-position interlocking plate reset spring 15.

[0037] The three-position interlocking plate 12 is fixed to the three-position switch 60 by means of the shaft 12a and screws. The three-position interlocking plate 12 can rotate around the shaft 12a and rotate between the locking limit position and the unlocking limit position under the action of the positioning shaft 11 and the three-position interlocking plate reset spring 15.

[0038] The locking limit column 13 and the unlocking limit column 14 are respectively installed on the locking limit position and the unlocking limit position of the three-position switch 60 and are located on the left and right sides of the rotation direction of the three-position interlocking plate 12, so as to limit the locking limit position and the unlocking limit position of the three-position interlocking plate 12; when the three-position interlocking plate 12 hits the locking limit column 13, it reaches the locking limit position, and when the three-position interlocking plate 12 hits the unlocking limit column 13, it reaches the unlocking limit position.

[0039] One end of the reset spring 15 of the three-position interlocking plate is connected to the mechanism bracket of the three-position switch 60, and the other end is connected to the three-position interlocking plate 12.

[0040] When the three-position interlocking plate 12 is in the extreme locking position, the first interlocking rod 40 cannot be lifted.

[0041] The circuit breaker connection and locking structure 20 is installed in the side plate 71 of the circuit breaker 70, and it includes a linkage plate 21, a main shaft linkage plate 22, a first pull rod fixing block 23, a second pull rod fixing block 24, and a circuit breaker electric trip control switch 25.

[0042] The linkage plate 21 is movably installed on the side plate 71 of the circuit breaker 70 through a movable mounting post 21a and can move up and down; the first pull rod fixing block 23 and the second pull rod fixing block 24 are fixedly installed at appropriate positions on the linkage plate 21 so as to be rigidly connected to the first interlocking rod 40 and the second interlocking rod 50 respectively.

[0043] The main shaft linkage plate 22 is installed on the main output shaft 72 of the circuit breaker 70 and rotates synchronously with the main output shaft 72 of the circuit breaker 70. When the circuit breaker 70 is in the closed position, the linkage plate 21 is released to allow the linkage plate 21 to move up and down. When the circuit breaker 70 is in the open position, the linkage plate 21 is locked to prohibit its up and down movement.

[0044] The power input end of the first interlocking rod 40 is interlocked with the three-position locking structure 10, and a lifting button 41 is provided at the power input end of the first interlocking rod 40 for lifting and unlocking when the interlocking device between the circuit breaker, the three-position switch and the cable chamber door is in the unlocked state.

[0045] The power output end of the first interlocking rod 40 is interlocked with the circuit breaker connection and locking structure 20. Specifically, the power output end of the first interlocking rod 40 is threadedly connected to the first pull rod fixing block 23, and by rotating the first interlocking rod 40, the height position of the first interlocking rod 40 can be adjusted.

[0046] The power input end of the second interlocking rod 50 is interlocked with the circuit breaker connection and locking structure 20. Specifically, the power input end of the second interlocking rod 50 is threadedly connected to the second pull rod fixing block 24, and by rotating the second interlocking rod 50, the height position of the second interlocking rod 50 can be adjusted.

[0047] The second interlocking rod 50 can be composed of two rod segments, and the two rod segments are hinged into an L shape.

[0048] The cable chamber door locking structure 30 includes a lock pin 31, a lock tongue 32, a lock pin baffle reset spring 33, a lock pin baffle 34, and a lock pin guide housing 35.

[0049] The power output end of the second interlocking rod 50 is interlocked with the cable chamber door locking structure 30. Specifically, the locking pin 31 is installed on the power output end of the second interlocking rod 50.

[0050] The locking tongue 32 is installed on the cable chamber door (not shown in the figure) and is locked by inserting the locking pin 31. The locking pin guiding housing 35 is installed inside the cable chamber (not shown in the figure), and the locking pin baffle 34 is installed inside the locking pin guiding housing 35. The locking pin guiding housing 35 guides the locking pin 31 and the locking pin baffle 34, so that the locking pin 31 can accurately insert into the locking tongue hole (not shown in the figure) on the locking tongue 32 and ensure the correct movement of the locking pin baffle 34.

[0051] One end of the locking pin baffle return spring 33 is connected to the locking pin baffle 34, and the other end is connected to the locking pin guiding housing 35. The locking pin baffle 34 is lifted to unlock under the action of the locking pin baffle return spring 33, pushing out the locking tongue 32 to open the cable chamber door and blocking the locking pin 31 to prevent it from falling.

[0052] See Figure 3 and Figure 4 and in combination with Figure 1 and Figure 2 , the working principle of the interlocking device between the circuit breaker, the three-position switch and the cable chamber door of the present invention is as follows:

[0053] When the three-position switch 60 is operated to the grounding position, the positioning shaft 11 on the indicating disc 61 pushes the three-position interlocking plate 12 to rotate around the shaft 12a to the limit unlocking position, that is, the up and down movement position of the first interlocking rod 40 is released. At this time, the three-position interlocking plate 12 is blocked by the unlocking limit post 14, indicating that the position locking of the three-position switch 60 for interlocking is released. On the contrary, the positioning shaft 11 leaves the pushing position, disengages from the contact with the three-position interlocking plate 12, and the three-position interlocking plate return spring 15 drives the three-position interlocking plate 12 to reset to the limit locking position, where it is restricted by the locking limit post 13 and locked in the limit locking position, returning to the interlocking locking position of the three-position locking structure 10.

[0054] The first interlocking rod 40 and the second interlocking rod 50 are connected in series between the three-position locking structure 10 and the cable chamber door locking structure 30 through the first pull rod fixing block 23 and the second pull rod fixing block 24 on the linkage plate 21. When the circuit breaker 70 is closed, the main shaft linkage plate 22 installed on the main output shaft 72 of the circuit breaker 70 releases the linkage plate 21. At this time, the locking structure inside the circuit breaker 70 is unlocked. When the lifting button 41 is lifted, the linkage plate 21 is lifted through the first interlocking rod 40.

[0055] When the linkage plate 21 is lifted, the electric trip control change-over switch 25 of the circuit breaker is cut off and the trip button push rod 73 is blocked. The locking pin 31 and the locking pin baffle 34 are installed in the locking pin guiding housing 35, and the guiding and limit positions of the two components are controlled by it. The locking pin 31 can be lifted together to release the locking tongue 32. The locking pin baffle 34 pushes out the locking tongue 32 under the push of the locking pin baffle return spring 33 to open the cable chamber door. The locking pin baffle 34 blocks the falling position of the locking pin 31. At this time, the interlocking device between the whole circuit breaker, the three-position switch and the cable chamber door is in the unlocked state; after the maintenance is completed and the cable chamber door is closed, the locking tongue 32 pushes the locking pin baffle 34 back, and the locking pin 31 and the interlocking device between the whole circuit breaker, the three-position switch and the cable chamber door fall in place due to gravity, and the interlocking of the interlocking device between the whole circuit breaker, the three-position switch and the cable chamber door resumes the locked state.

[0056] To sum up, when the three-position switch 60 is in the grounding position, the circuit breaker 70 is in the closed position, and the whole cabinet state belongs to the grounding state, the interlocking position limit of the interlocking device between the whole circuit breaker, the three-position switch and the cable chamber door is released, allowing the door to be lifted and unlocked, opening the cable chamber door for maintenance or repair; the circuit breaker 70 cannot be tripped under the maintenance state, and the three-position switch 60 cannot be operated due to the interlock with the circuit breaker 70, ensuring the safety and controllability of the whole maintenance state.

[0057] When any part of the three-position switch 60 or the circuit breaker 70 does not meet the condition for opening the cable chamber door, the door cannot be opened; when the cable chamber door is closed after the maintenance is completed and the circuit breaker 70 is tripped, the interlocking device between the whole circuit breaker, the three-position switch and the cable chamber door is in the automatic unlocking state again and subsequent operations can be carried out, ensuring the operation safety.

[0058] The present invention provides an interlocking device between a circuit breaker, a three-position switch and a cable chamber door, which meets the five-prevention interlocking requirements for switch cabinets, avoids the defects of traditional pull-wire structures and flexible connection structures, has a simple structure and few components, and can meet the requirements of high reliability of five-prevention interlocking for switch cabinets in substations.

[0059] The above are only the preferred examples of the present invention. Although the content of the present invention has been introduced in detail through the above preferred examples, for those of ordinary skill in the art, under the technical inspiration provided by the present invention, various modifications and substitutions of the present invention will be obvious, and these should also be regarded as the protection scope of the present invention.

Claims

1. An interlocking device between a circuit breaker, a three-position switch and a cable chamber door, comprising a three-position locking structure, a circuit breaker connection and locking structure, and a cable chamber door locking structure, characterized in that It further includes a first interlocking rod and a second interlocking rod made of rigid structures. The three-position locking structure realizes a hard connection interlock between the circuit breaker and the connection and locking structure through the first interlocking rod, and the circuit breaker connection and locking structure realizes a hard connection interlock between the cable chamber door locking structure through the second interlocking rod; The three-position locking structure includes: A positioning shaft installed on the indicating disk of the three-position switch, which is used to output the position state of the three-position switch; A three-position interlocking plate axially arranged on the three-position switch, which rotates between the locking limit position and the unlocking limit position; A locking limit post installed at the locking limit position of the three-position switch, which is used to limit the locking limit position of the three-position interlocking plate; An unlocking limit post installed at the unlocking limit position of the three-position switch, which is used to limit the unlocking limit position of the three-position interlocking plate; A three-position interlocking plate return spring, one end of which is connected to the mechanism bracket of the three-position switch, and the other end is connected to the three-position interlocking plate. This three-position interlocking plate return spring is used to drive the three-position interlocking plate to return from the unlocking limit position to the locking limit position; The circuit breaker connection and locking structure is installed inside the circuit breaker side plate, and it includes: A linkage plate, which is movably installed on the circuit breaker side plate and can move up and down; A main shaft linkage plate installed on the main output shaft of the circuit breaker and rotating synchronously with the main output shaft of the circuit breaker. When the circuit breaker is in the closed state, the linkage plate is released to move up and down, and when the circuit breaker is in the open state, the linkage plate is locked to prevent it from moving up and down; A first pull rod fixing block installed on the linkage plate. The power output end of the first interlocking rod is adjustably connected to the first pull rod fixing block to adjust the height position of the first interlocking rod; a lifting button is provided at the power input end of the first interlocking rod, which is used to lift and unlock when the interlocking device between the circuit breaker, the three-position switch and the cable chamber door is in the unlocked state; A second pull rod fixing block installed on the linkage plate. The power input end of the second interlocking rod is adjustably connected to the second pull rod fixing block to adjust the height position of the second interlocking rod; A circuit breaker electric opening control switching switch, which is installed on the side plate of the circuit breaker. When the linkage plate is lifted and unlocked, the circuit breaker electric opening control switching switch is cut off. At this time, the circuit breaker electric opening control is disconnected and electric opening cannot be performed.

2. An interlocking device between a circuit breaker, a three-position switch and a cable chamber door according to claim 1, characterized in that, The power input end of the first interlocking rod is interlocked with the three-position locking structure, and the power output end of the first interlocking rod is interlocked with the circuit breaker connection and locking structure; the power input end of the second interlocking rod is interlocked with the circuit breaker connection and locking structure, and the power output end of the second interlocking rod is interlocked with the cable chamber door locking structure.

3. An interlocking device between a circuit breaker, a three-position switch and a cable chamber door according to claim 2, characterized in that, The cable chamber door locking structure includes: A lock pin installed on the power output end of the second interlocking rod; A lock tongue installed on the cable chamber door, which is locked by inserting the lock pin; A locking pin baffle installed in the cable chamber. The locking pin baffle is lifted and unlocked under the action of the locking pin baffle return spring, pushing out the locking tongue to open the cable chamber door and blocking the locking pin to prevent it from falling.

4. An interlocking device between a circuit breaker, a three-position switch and a cable chamber door according to claim 3, characterized in that, The cable chamber door locking structure further includes: A locking pin guiding housing installed in the cable chamber. The locking pin baffle is installed in the locking pin guiding housing. The locking pin guiding housing guides the locking pin and the locking pin baffle, so that the locking pin can accurately insert into the locking tongue hole on the locking tongue and ensure the correct movement of the locking pin baffle; one end of the locking pin baffle return spring is connected to the locking pin baffle, and the other end is connected to the locking pin guiding housing.

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