Handcart type circuit breaker and valve structure thereof

Abstract

The invention discloses a valve structure of a handcart-type circuit breaker, and the structure comprises a fixed part which is provided with a plurality of through holes; the movable part is linked with the circuit breaker handcart; the plurality of through holes and the movable parts are arranged in two groups, and the two groups of movable parts are arranged in an upper layer and a lower layer; the forward or reverse movement of the circuit breaker handcart is converted into the movement of the two groups of moving parts through the linkage assembly, and the two groups of moving parts correspondingly open or close the through hole so as to expose or shield the circuit breaker static contact in the cavity shell. The invention also discloses a handcart type circuit breaker. According to the handcart type circuit breaker and the valve structure thereof, it is ensured that the movable part and the circuit breaker handcart can move synchronously, the through holes are accurately opened and closed, and an electric shock accident caused by mistakenly touching a static contact by a person is prevented; the structure is simple and reliable, and long-term stable operation of equipment can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power transformation and distribution equipment, in particular to a trolley-type circuit breaker and a valve structure thereof. Background Art

[0002] The valves of conventional trolley-type circuit breakers are mostly sheet metal parts, that is, single-plate structures formed by bending, cutting, and other processing of metal sheets. The valves of conventional trolley-type circuit breakers have the following main defects due to their unreasonable structural design: The single-layer structure lacks mechanical strength, resulting in poor protection. Long-term exposure to electric fields, heat, and mechanical vibration can lead to cracking and embrittlement, resulting in a gradual decline in insulation performance. Furthermore, the thickness of the structure is insufficient to meet creepage distance requirements, making surface flashover more likely. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a trolley-type circuit breaker and its valve structure, which ensures that the movable parts can move synchronously with the circuit breaker trolley, accurately open and close multiple through holes, and prevent people from accidentally touching the static contacts and causing electric shock accidents; the structure is simple and reliable, and can ensure long-term stable operation of the equipment.

[0004] In order to solve the above technical problems, the present invention provides a valve structure for a trolley-type circuit breaker, comprising: a fixed part installed in a cavity shell, the fixed part being provided with a plurality of through holes; a movable part linked to the circuit breaker trolley; and a linkage assembly installed between the fixed part and the movable part, wherein: the plurality of through holes and the movable part are each provided in two groups, and the two groups of movable parts are arranged in an upper and lower layer; the forward or reverse movement of the circuit breaker trolley is converted into movement of the two groups of movable parts through the linkage assembly, and the two groups of movable parts correspondingly open or close the through holes to reveal or cover the static contacts of the circuit breaker in the cavity shell.

[0005] Among them, the linkage assembly includes: two racks, a gear and a mounting shaft; the gear is assembled and connected to the mounting shaft, and the mounting shaft is rotatably mounted on the fixed part; the two racks are arranged to be centrally symmetrical, one end of the two racks is respectively engaged with the gears, and the other opposite ends of the two racks are respectively connected to the ends of the two groups of movable parts in a one-to-one correspondence. The movement of one rack drives the gear to rotate, and the rotating gear drives the other rack to move synchronously.

[0006] The linkage assembly further includes: a guide sleeve for limiting the movement of the rack, the guide sleeve is fastened to the fixing member, and the rack passes through the guide sleeve.

[0007] It also includes: a connecting rod assembly for converting the movement of the circuit breaker trolley into the movement of the lower movable part, wherein: the circuit breaker trolley moves, and the lower movable part moves upward through the connecting rod assembly to block the static contact of the circuit breaker.

[0008] The connecting rod assembly includes: a first connecting rod, a second connecting rod and a third connecting rod connected in sequence, wherein: one end of the first connecting rod is fastened to the movable part, the middle part of the second connecting rod is connected to the fixed part, and the third connecting rod is connected to the circuit breaker trolley, wherein: the circuit breaker trolley flips and moves the second connecting rod by linking the flipping and movement of the third connecting rod.

[0009] It also includes: two guide posts for guiding the position and moving direction of the movable parts, the two guide posts are respectively connected to the fixed parts, and the two guide posts are correspondingly passed through the opposite sides of the two groups of movable parts.

[0010] It also includes a reset component, which includes a limit block installed on the guide column and a spring sleeved on the guide column, wherein the opposite ends of the spring are respectively pressed between the limit block and the movable part.

[0011] Among them, the movable part is a multi-layer composite insulating plate structure; the movable part includes: an insulating plate, a metal shielding frame, a metal shielding plate and a flexible part fixed at the edge of the metal shielding plate stacked in sequence, wherein: the metal shielding frame surrounds to form an air insulation cavity.

[0012] The insulating plate is made of epoxy resin sheet material, and the metal shielding frame and the metal shielding plate are made of stainless steel or aluminum alloy components.

[0013] In order to solve the above technical problems, the present invention further discloses a trolley-type circuit breaker having the above-mentioned movable door structure of the trolley-type circuit breaker.

[0014] The implementation of the trolley-type circuit breaker and its valve structure of the present invention has the following beneficial effects: the valve structure of the trolley-type circuit breaker includes: a fixed part installed in a cavity shell, the fixed part being provided with a plurality of through holes; a movable part linked to the circuit breaker trolley; and a linkage assembly installed between the fixed part and the movable part, wherein: the plurality of through holes and the movable part are each provided in two groups, and the two groups of movable parts are arranged in an upper and lower layers; the forward or reverse movement of the circuit breaker trolley is converted into the movement of the two groups of movable parts through the linkage assembly, and the two groups of movable parts correspondingly open or close the through holes to reveal or cover the circuit breaker static contacts in the cavity shell, ensuring that the movable part can achieve synchronous movement with the circuit breaker trolley, so as to accurately open and close the plurality of through holes and prevent people from accidentally touching the static contacts and causing electric shock accidents; the structure is simple and reliable, and can ensure the long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 The figure is a schematic structural diagram of a valve for a trolley-type circuit breaker according to an embodiment of the present invention.

[0017] Figure 2 The figure is a schematic structural diagram of the movable parts of the valve for a trolley-type circuit breaker according to an embodiment of the present invention.

[0018] Figure 3 The present invention is a schematic structural diagram of a linkage assembly and two groups of movable parts for a valve of a trolley-type circuit breaker according to an embodiment of the present invention.

[0019] Figure 4 The figure is an enlarged structural diagram of a linkage assembly for a valve of a trolley-type circuit breaker according to an embodiment of the present invention.

[0020] Figure 5 The figure is an enlarged structural schematic diagram of a connecting rod assembly for a valve of a trolley-type circuit breaker according to an embodiment of the present invention.

[0021] Figure 6 The figure is an enlarged structural diagram of a reset assembly for a valve of a trolley-type circuit breaker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] like Figures 1-6 FIG. 1 shows a first embodiment of the valve structure of a trolley-type circuit breaker according to the present invention.

[0024] A trolley-type circuit breaker is a circuit breaker that can be flexibly moved within a switch cabinet via rails or wheels. In this embodiment, the trolley-type circuit breaker is a structure in which the circuit breaker body is mounted on a removable trolley, which has the advantage of allowing maintenance without affecting the operation of other circuits.

[0025] Furthermore, the valve in this embodiment is an important component of the trolley-type circuit breaker. It is installed in the trolley cavity shell of the circuit breaker and forms a mechanical linkage with the circuit breaker trolley. The valve structure of the trolley-type circuit breaker in this embodiment can prevent the operator from accidentally touching the high-voltage live body by automatically opening and closing the static contact of the shielding cabinet.

[0026] In practice, the shutter structure of the trolley-type circuit breaker in this embodiment includes: a fixed member 1 installed in a cavity housing, the fixed member 1 having a plurality of through holes 11; a movable member 2 linked to the circuit breaker trolley; and a linkage assembly 5 installed between the fixed member 1 and the movable member 2, wherein: The multiple through holes 11 and the movable parts 2 are each provided in two groups, and the two groups of movable parts 2 are arranged in an upper and lower layer; the forward or reverse movement of the circuit breaker trolley is converted into the movement of the two groups of movable parts 2 through the linkage assembly 5, and the two groups of movable parts 2 correspondingly open or close the through holes 11 to reveal or cover the static contacts of the circuit breaker in the cavity shell.

[0027] During implementation, the double set of valves is particularly suitable for double-break contact systems, such as upper and lower static contacts of a center-mounted switch cabinet or scenarios where multiple circuits are arranged in parallel.

[0028] Furthermore, the movable member 2 can shield the electromagnetic field around the static contact, reducing electromagnetic interference while also preventing arc leakage, thereby improving the safety of the device. In this embodiment, the movable member 2 is a multi-layer composite insulating plate structure, comprising: an insulating plate 21, a metal shielding frame 22, a metal shielding plate 23, and a flexible member 25 fixed to the edge of the metal shielding plate 23.

[0029] Insulating plate 21 is made of epoxy resin, while metal shielding frame 22 and metal shielding plate 23 are made of stainless steel or aluminum alloy. The epoxy resin offers excellent insulation properties, effectively resisting creepage. The insulating coating applied to insulating plate 21 prevents creepage, effectively preventing accidental contact with live components.

[0030] Furthermore, the metal shielding frame 22 and the metal shielding plate 23 are an integrated structure, and the metal shielding frame 22 surrounds to form an air insulation cavity 24, further utilizing the insulating properties of air to enhance the insulation performance of the movable part 2, ensuring that when the circuit is connected, the current will not leak through the movable part 2, thereby ensuring the safety of equipment and personnel.

[0031] Preferably, the metal shielding plate 23 and the metal shielding frame 22 form a closed shielding cavity, completely enclosing the air insulation cavity 24. In other embodiments, the insulating plate 21, the metal shielding frame 22 and the metal shielding plate 23 can be formed by welding or other common connection means that meet the requirements of use.

[0032] The metal shielding frame 22 and the metal shielding plate 23 made of stainless steel or aluminum alloy cooperate with the insulating plate 21 to enhance the insulating shielding effect. Due to the high structural strength, it can avoid jamming or sealing failure caused by the tilt of the movable part 2 and meet different usage scenarios.

[0033] During operation, when the static contact is exposed and docked with the moving contact of the trolley, the metal shielding frame 22, through grounding, confines the alternating electromagnetic field surrounding the static contact to the interior of the air-insulated cavity 24, suppressing electromagnetic radiation interference with surrounding equipment. Furthermore, if an arc discharge occurs, the metal shielding frame 22 quickly guides the arc current to the ground, preventing arc erosion at the edges of the movable member 2.

[0034] The function of the flexible member 25 is as follows: the flexible member 25 is a structure of a silicone rubber sealing strip, a conductive elastic gasket or an insulating elastic gasket, and forms a dynamic sealing fit with the inner wall of the fixing member 1 .

[0035] As the movable element 2 moves, the flexible element 25 elastically deforms to fill the slight tolerance between the metal shielding plate 23 and the fixed element 1, improving shielding effectiveness and sealing, and preventing the intrusion of dust, water, and other foreign matter that could compromise insulation. The flexible element 25 can be bonded to the edge of the metal shielding plate 23 using conductive silver adhesive, ensuring both ground continuity and sealing performance.

[0036] Furthermore, a linkage assembly 5 is provided between the fixed part 1 and the movable part 2, and the linkage assembly 5 is used to convert the movement of the circuit breaker trolley into the movement of the movable part 2. When in use, when the circuit breaker trolley is inserted into the cavity shell, the trolley moves along a specific track toward the fixed part 1.

[0037] The linkage assembly 5 includes: two racks 51, a gear 52 and a mounting shaft 53; the gear 52 is assembled and connected to the mounting shaft 53, and the mounting shaft 53 is rotatably mounted on the fixed part 1; the two racks 51 are arranged to be centrally symmetrical, and one end of the two racks 51 is respectively engaged with the gear 52, and the other opposite ends of the two racks 51 are respectively connected to the ends of the two groups of movable parts 2 in a one-to-one correspondence. The movement of one rack drives the gear 52 to rotate, and the rotating gear 52 drives the other rack to move synchronously.

[0038] During implementation, when in use, for the opening process, when the movable part 2 on the lower layer moves downward, it will drive the rack 51 connected to it to move downward. Since the gear 52 is engaged with the two racks 51 respectively, the movement of the rack 51 will drive the gear 52 to rotate through the meshing action, causing the other rack 51 to move upward, and then drive the movable part 2 on the upper layer to move upward, so that the two groups of through holes 11 are opened.

[0039] It can be understood that when the movable part 2 on the lower layer moves upward, it will drive the rack 51 connected to it to move upward. Since the gear 52 is engaged with the two racks 51, the movement of the rack 51 will drive the gear 52 to rotate through the meshing action, causing the other rack 51 to move downward, and then drive the movable part 2 on the upper side to move downward, thereby closing the two groups of through holes 11.

[0040] Preferably, the linkage assembly 5 further includes: a guide sleeve 54 for limiting the movement of the rack 51 , the guide sleeve 54 is fastened to the fixing member 1 , and the rack 51 passes through the guide sleeve 54 .

[0041] During implementation, the guide sleeve 54 is provided to limit the moving direction of the rack 51 , thereby preventing the rack 51 from affecting the linkage due to skewness, and ensuring the reliability of the engagement between the gear 52 and the two racks 51 .

[0042] Furthermore, it also includes: a connecting rod assembly 4 for converting the movement of the circuit breaker trolley into the movement of the lower movable part 2, wherein: the circuit breaker trolley moves, and the lower movable part 2 moves upward through the connecting rod assembly 4 to block the static contact of the circuit breaker.

[0043] Preferably, the connecting rod assembly 4 includes: a first connecting rod 41, a second connecting rod 42 and a third connecting rod 43 connected in sequence, wherein: one end of the first connecting rod 41 is fastened to the movable part 2, the middle part of the second connecting rod 42 is connected to the fixed part 1, and the third connecting rod 43 is connected to the circuit breaker trolley, wherein: the circuit breaker trolley flips and moves the second connecting rod 42 by linking the flipping and movement of the third connecting rod 43.

[0044] During operation, when the circuit breaker is pulled out, the movement of the circuit breaker causes the third link 43 to flip and move, which in turn causes the second link 42 to flip. Because the middle portion of the second link 42 is pivotally connected to the fixed member 1, and one end of the second link 42 is pivotally connected to the first link 41, and the first link 41 is pivotally connected to the lower movable member 2, when the second link 42 is pulled and flipped by the third link 43, the other end of the second link 42 rises, simultaneously pushing the first link 41 to flip and move. The first link 41 lifts the lower movable member 2, causing it to move upward and cover the through-hole 11. Simultaneously, under the linkage action of the linkage assembly 5, the upper movable member 2 moves downward and covers the corresponding through-hole 11.

[0045] When the circuit breaker is inserted, the circuit breaker will pull the lower movable member 2 downward through the connecting rod assembly 4 to open the corresponding through hole 11.

[0046] Furthermore, it also includes: two guide posts 3 for guiding the position and movement direction of the movable part 2, the two guide posts 3 are respectively connected to the fixed part 1, and the two guide posts 3 are correspondingly passed through the opposite sides of the two groups of movable parts 2.

[0047] During implementation, by providing the guide column 3 , the position and moving direction of the movable part 2 can be limited, thereby further improving the stability of the movable part 2 .

[0048] Furthermore, it also includes: a reset component 6, which includes: a limit block 61 installed on the guide column 3 and a spring 62 sleeved on the guide column 3, wherein: the opposite ends of the spring 62 are respectively pressed between the limit block 61 and the movable part 2.

[0049] During implementation, the stop block 61 has a threaded hole 611. By providing the reset assembly 6, when the circuit breaker is inserted, the upper movable member 2 moves upward, causing the spring 62 to contract. Under the elastic force of the spring 62, the movable member 2 has a tendency to move downward. When the circuit breaker is withdrawn, the upper movable member 2 steadily moves downward, shielding the through-hole 11 thanks to the coordinated action of the connecting rod assembly 4, the linkage assembly 5, and the elastic force of the spring 62. This improves operational reliability and safety. Even if the linkage assembly 5 mechanically malfunctions, the movable member 2 can still reliably shield the through-hole 11 during testing.

[0050] In the specific implementation of the trapdoor structure of the trolley-type circuit breaker in this embodiment, when the circuit breaker trolley is inserted, the trolley moves along a specific track toward the fixed member 1. Because the linkage assembly 5 is connected to the circuit breaker trolley, as the trolley moves, the linkage assembly 5 comes into play, converting the trolley's movement into linear movement of the movable member 2. Because the movable member 2 utilizes a multi-layer composite insulation structure, its insulation performance effectively ensures safety during operation during movement.

[0051] As the circuit breaker trolley is gradually inserted, the movable part 2 moves toward the direction of opening the through hole 11, so that the through hole 11 is gradually opened and the static contact of the circuit breaker is exposed. At this time, the movable contact on the trolley can be smoothly connected with the static contact to complete the circuit connection; in this process, the metal shielding layer in the multi-layer composite insulation structure of the movable part 2 plays an important role. It can shield the electromagnetic field around the static contact, reduce electromagnetic interference, and prevent arc leakage, thereby improving the safety of the equipment.

[0052] When the circuit breaker cart needs to be withdrawn, the cart moves in the opposite direction, and the linkage assembly 5 drives the movable member 2 toward the direction of closing the through-hole 11. The movable member 2 gradually closes the through-hole 11, shielding the circuit breaker's static contact and isolating it from the outside world. At this point, the multi-layer composite insulation structure once again plays a key role. The insulating plate 21, the metal shielding layer, and the air insulation cavity 24 together form a safety barrier, preventing people from accidentally touching the static contact and causing electric shock. It also prevents damage to the static contact from external dust, moisture, etc., ensuring the long-term stable operation of the equipment.

[0053] The present invention further discloses a trolley-type circuit breaker having the above-mentioned movable door structure of the trolley-type circuit breaker. The specific implementation of the trolley-type circuit breaker is the same as the implementation of the movable door structure of the above-mentioned trolley-type circuit breaker, and will not be repeated here.

[0054] The trolley-type circuit breaker and its valve structure in this embodiment have the following beneficial effects: the valve structure of the trolley-type circuit breaker includes: a fixed part installed in the cavity shell, with multiple through holes provided on the fixed part; a movable part linked with the circuit breaker trolley; and a linkage assembly installed between the fixed part and the movable part, wherein: the multiple through holes and the movable parts are set as two groups, and the two groups of movable parts are arranged in upper and lower layers; the forward or reverse movement of the circuit breaker trolley is converted into the movement of the two groups of movable parts through the linkage assembly, and the two groups of movable parts open or close the through holes correspondingly to expose or cover the static contacts of the circuit breaker in the cavity shell. The precise transmission of the linkage assembly ensures that the movable parts can be synchronized with the movement of the circuit breaker trolley to achieve accurate opening and closing of the through holes, and the multi-layer composite insulation structure of the movable parts always provides reliable insulation protection and safety shielding during the process of circuit connection and disconnection, thereby realizing a high-safety trolley valve function; the structure is simple and reliable, which can ensure long-term stable operation of the equipment.

Claims

1. A valve structure of a trolley type circuit breaker, characterized in that: include: A fixing member installed in the cavity shell, wherein the fixing member is provided with a plurality of through holes; Movable parts linked with the circuit breaker trolley; as well as A linkage assembly installed between the fixed member and the movable member, wherein: The plurality of through holes and the movable parts are each provided in two groups, and the two groups of movable parts are arranged in an upper and a lower layer; The forward or reverse movement of the circuit breaker trolley is converted into the movement of two groups of movable parts through the linkage assembly. The two groups of movable parts correspondingly open or close the through holes to reveal or cover the static contacts of the circuit breaker in the cavity shell.

2. The valve structure of the trolley type circuit breaker according to claim 1, characterized in that: The linkage assembly includes: two racks, a gear and a mounting shaft; The gear is connected to the mounting shaft, and the mounting shaft is rotatably mounted on the fixing member; The two racks are arranged to be centrally symmetrical, one end of the two racks is respectively engaged with the gears, and the other opposite ends of the two racks are respectively connected to the ends of the two groups of movable parts in a one-to-one correspondence. The movement of one rack drives the gear to rotate, and the rotating gear drives the other rack to move synchronously.

3. The valve structure of the trolley type circuit breaker according to claim 2, characterized in that: The linkage assembly further includes a guide sleeve for limiting the movement of the rack, the guide sleeve is fastened to the fixing member, and the rack passes through the guide sleeve.

4. The valve structure of the trolley type circuit breaker according to claim 1, characterized in that: Also includes: A connecting rod assembly for converting the movement of the circuit breaker trolley into the movement of the movable parts on the lower level, wherein: The circuit breaker trolley moves, and the movable part on the lower layer moves upward through the linkage assembly to shield the static contact of the circuit breaker.

5. The shutter structure of the trolley type circuit breaker according to claim 4, characterized in that: The connecting rod assembly includes: a first connecting rod, a second connecting rod and a third connecting rod connected in sequence, wherein: One end of the first connecting rod is fastened to the movable part, the middle part of the second connecting rod is connected to the fixed part, and the third connecting rod is connected to the circuit breaker trolley, wherein: the circuit breaker trolley causes the second connecting rod to flip and tilt upward by linking the flipping and movement of the third connecting rod.

6. The valve structure of the trolley type circuit breaker according to claim 1, characterized in that: Also includes: Two guide posts are used to guide the position and movement direction of the movable parts. The two guide posts are respectively connected to the fixed parts. The two guide posts are connected to the two opposite sides of the two groups of movable parts in a one-to-one correspondence.

7. The shutter structure of the trolley type circuit breaker according to claim 6, characterized in that: Also includes: A reset assembly, comprising: a limit block mounted on the guide post and a spring sleeved on the guide post, wherein: The opposite ends of the spring are respectively pressed between the limiting block and the movable member.

8. The shutter structure of the trolley type circuit breaker according to claim 1, characterized in that: The movable part is a multi-layer composite insulating plate structure; The movable part comprises an insulating plate, a metal shielding frame, a metal shielding plate and a flexible part fixed at the edge of the metal shielding plate, which are stacked in sequence. The metal shielding frame surrounds and forms an air insulation cavity.

9. The shutter structure of the trolley type circuit breaker according to claim 8, characterized in that: The insulating plate is made of epoxy resin plate material, and the metal shielding frame and the metal shielding plate are made of stainless steel or aluminum alloy components.

10. A trolley type circuit breaker, characterized in that: The trolley-type circuit breaker includes the valve structure of the trolley-type circuit breaker according to any one of claims 1 to 9.

Images