High-low voltage door interlocking device and box transformer shell

Abstract

The application provides a high-low voltage door interlocking device and a box transformer shell, and belongs to the field of transformer substations. The high-low voltage door interlocking device comprises a lever, low-voltage side components and high-voltage side components are arranged at two ends of the lever respectively, the low-voltage side components comprise a bearing thrust part, the high-voltage side components comprise an extension rod connected with the lever and extending vertically and a locking part connected at the end of the extension rod. The box transformer shell comprises the interlocking device. The box transformer shell provided by the application can force the maintenance personnel to open the low-voltage door first and then open the high-voltage door, avoid the maintenance personnel from not opening the door according to the specified sequence due to negligence, and the opening operation is the same as that of the traditional box transformer shell, so that the maintenance personnel do not need to change the operation habit and the use is more convenient.

Description

Technical Field

[0001] This invention belongs to the field of substations, and in particular relates to a high- and low-voltage door interlocking device and a transformer substation enclosure. Background Technology

[0002] A prefabricated substation (PGS) is a complete set of power distribution equipment that integrates three major functional modules—high-voltage power reception, transformer step-down, and low-voltage power distribution—into one or more fully enclosed steel structure enclosures according to a specific wiring scheme. A typical PPS is usually divided into three compartments: a high-voltage compartment, a low-voltage compartment, and a transformer compartment. During maintenance, the low-voltage compartment door must be opened first to confirm and disconnect all possible power feedback paths, ensuring the high-voltage compartment is de-energized before opening the high-voltage compartment door.

[0003] During operation, maintenance personnel may easily fail to open doors in the prescribed order due to personal negligence, leading to serious safety accidents. In response, Chinese utility model patent with authorization announcement number CN204792531U provides a combined door interlocking device for high and low voltage compartments of transformers. This device, through mechanical interlocking, forces maintenance personnel to open doors in the prescribed order, thereby improving operational safety.

[0004] The device includes an operating component located in the low-voltage compartment, a locking component located in the high-voltage compartment, and a linkage component running between the two compartments. The locking component locks the high-voltage compartment door from the inside, preventing maintenance personnel from opening it directly from the outside. They must enter the low-voltage compartment and use the operating component to open the high-voltage compartment door. While this device prevents maintenance personnel from opening doors out of sequence, it adds an extra step compared to traditional transformer substations, requiring maintenance personnel to change their operating habits and causing inconvenience. Summary of the Invention

[0005] The purpose of this invention is to provide a transformer substation enclosure to solve the technical problem that opening the door of existing transformer substation equipment with mechanical interlocks is inconvenient.

[0006] Another object of the present invention is to provide a high-low voltage door interlocking device to solve the above-mentioned technical problems after being installed on the housing of a transformer substation.

[0007] To achieve the above objectives, the technical solution for the transformer substation enclosure provided by this invention is as follows: A transformer substation enclosure includes a main body, a low-voltage door, a high-voltage door, and low-voltage side door locks and high-voltage side door locks. It also includes an interlocking device. The interlocking device includes a lever horizontally positioned at the upper or lower sill of the main body. The lever has a low-voltage side component and a high-voltage side component at its two ends. The lever can rotate forward under the influence of weight imbalance on both sides of the fulcrum, or by configuring an elastic element and applying its elastic force, thereby causing the low-voltage side component to move vertically towards the low-voltage door. The low-voltage side component includes a push-bearing part. The high-voltage side component includes an extension rod connected to the lever and extending vertically, and a locking part connected to the end of the extension rod and capable of engaging with the lock plate of the high-voltage side door lock. During the locking process of the low-voltage door, the lock rod end of the low-voltage side door lock pushes against the push-bearing part, causing the lever to rotate in the opposite direction, thereby blocking the locking part in the unlocking rotation path of the lock plate. After the low-voltage door is unlocked, the push-bearing part loses the limitation of the lock rod, and the lever rotates forward, causing the locking part to leave the unlocking rotation path of the lock plate.

[0008] As a further improvement, the fulcrum of the lever is positioned closer to the low-pressure side end so that the distance from the fulcrum to the low-pressure side end is less than the distance from the fulcrum to the high-pressure side end.

[0009] As a further improvement, the lever can rotate in the forward direction under the effect of weight imbalance on both sides of the fulcrum, and the lever is set at the upper threshold of the housing body. The low-pressure side component also includes a counterweight for providing a downward force to the low-pressure side end of the lever.

[0010] As a further improvement, the low-pressure side component also includes a mounting plate connected to the corresponding end of the lever. The push-bearing part and the counterweight part are both set on the mounting plate and arranged vertically. The mounting plate is provided with a vertically extending limiting elongated hole. The outer shell body is fixed with a limiting post for passing through the limiting elongated hole and guiding and limiting the vertical movement of the mounting plate.

[0011] As a further improvement, the locking part includes a locking plate fixedly connected to the extension rod, a stop post fixedly provided on the locking plate, and a snap-fit ​​notch provided on the locking plate for the stop post to engage.

[0012] The beneficial effects are as follows: The transformer substation enclosure provided by this invention is an improvement upon the traditional transformer substation enclosure. By incorporating an interlocking device, after both the low-voltage and high-voltage doors are locked, the locking part of the interlocking device can block the unlocking rotation path of the high-voltage side door lock, preventing maintenance personnel from opening the high-voltage door first. After the low-voltage door is unlocked, the locking part of the interlocking device can move away from the unlocking rotation path of the high-voltage side door lock, at which point the high-voltage door can be opened. Compared to traditional transformer substation enclosures, this enclosure forces maintenance personnel to open the low-voltage door first, followed by the high-voltage door, preventing negligence in opening the doors in the prescribed order. Furthermore, the opening operation of this enclosure is the same as that of traditional transformer substation enclosures, so maintenance personnel do not need to change their operating habits or adapt to a new operating method, making it more convenient to use than the solution in CN204792531U.

[0013] To achieve the above objectives, the technical solution of the high and low pressure door interlocking device provided by the present invention is as follows: A high-low pressure door interlocking device includes a horizontally mounted lever with a low-pressure side component and a high-pressure side component at each end. In use, the lever can rotate forward under the action of weight imbalance on both sides of the fulcrum or by configuring an elastic element and rotating under the elastic force of the elastic element, thereby causing the low-pressure side component to move vertically towards the low-pressure door. The low-pressure side component includes a push-bearing part, and the high-pressure side component includes an extension rod connected to the lever and extending vertically, and a locking part connected to the end of the extension rod. In use, the push-bearing part can move vertically under the push of the lock bar of the low-pressure side door lock, causing the lever to rotate in the opposite direction, thereby causing the locking part to block the unlocking rotation path of the lock plate. The push-bearing part can also move towards the low-pressure door after the low-pressure door is unlocked, causing the lever to rotate forward, thereby causing the locking part to leave the unlocking rotation path of the lock plate.

[0014] As a further improvement, the fulcrum of the lever is positioned closer to the low-pressure side end so that the distance from the fulcrum to the low-pressure side end is less than the distance from the fulcrum to the high-pressure side end.

[0015] As a further improvement, the lever can rotate in the forward direction under the effect of weight imbalance on both sides of the fulcrum, and the low-pressure side component also includes a counterweight for providing a downward force to the low-pressure side end of the lever.

[0016] As a further improvement, the low-pressure side component also includes a mounting plate connected to the corresponding end of the lever. The push-bearing part and the counterweight part are both mounted on the mounting plate and arranged vertically. The mounting plate is provided with a vertically extending limiting elongated hole.

[0017] As a further improvement, the locking part includes a locking plate fixedly connected to the extension rod, and a stop post for engaging with the locking plate is fixedly provided on the locking plate.

[0018] The beneficial effects are as follows: The high-low voltage door interlocking device provided by this invention is a pioneering invention. This high-low voltage door interlocking device is installed on the transformer substation casing and is used to achieve mechanical interlocking between the low-voltage side door lock and the high-voltage side door lock. After being put into use, when both the low-voltage and high-voltage doors are locked, the locking part of the high-low voltage door interlocking device can block the unlocking rotation path of the high-voltage side door lock's locking plate, preventing maintenance personnel from opening the high-voltage door first. After the low-voltage door is unlocked, the locking part of the high-low voltage door interlocking device can leave the unlocking rotation path of the high-voltage side door lock's locking plate, at which point the high-voltage door can be opened. Compared to traditional transformer substation casings, transformer substation casings using this high-low voltage door interlocking device can force maintenance personnel to open the low-voltage door first and then the high-voltage door, preventing maintenance personnel from opening the doors in the wrong order due to negligence. Moreover, the opening operation of the transformer substation enclosure using this high and low voltage door interlocking device is the same as that of the traditional transformer substation enclosure. Therefore, maintenance personnel do not need to change their operating habits or adapt to the new operating method. Thus, it is more convenient to use than the solution in CN204792531U. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the transformer substation housing in this invention; Figure 2 This is a schematic diagram of the interlocking device in Embodiment 1 of the transformer substation housing of the present invention; Figure 3 This is a front view of the low-voltage side components in Embodiment 1 of the transformer substation housing of the present invention; Figure 4 This is a side view of the low-voltage side components in Embodiment 1 of the transformer substation housing of the present invention; Figure 5 This is a partial schematic diagram showing the low-voltage door in a locked state in Embodiment 1 of the transformer substation housing of the present invention; Figure 6 This is a partial schematic diagram of the low-voltage door being in the unlocked state in Embodiment 1 of the transformer substation housing of the present invention; Figure 7 This is a front view of the locking plate in Embodiment 1 of the transformer substation housing of the present invention; Figure 8 This is a top view of the locking plate in Embodiment 1 of the transformer substation housing of the present invention; Figure 9 This is a partial schematic diagram of the high-voltage door when the low-voltage door is in the locked state in Embodiment 1 of the transformer housing of the present invention; Figure 10 This is a partial schematic diagram of the high-voltage door when the low-voltage door is in the unlocked state in Embodiment 1 of the transformer housing of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Main body of the outer shell; 11. Upper sill; 12. Lower sill; 13. Door post; 14. Limiting post; 15. Mounting shaft; 2. Low-pressure door; 3. High-pressure door; 4. Low-pressure side door lock; 41. Upper locking rod; 42. Lower locking rod; 5. High-pressure side door lock; 51. Locking plate; 52. Snap-fit ​​notch; 6. Lever; 61. Mounting hole; 7. Low-pressure side component; 71. Mounting plate; 72. Limiting elongated hole; 73. Push-support part; 74. Counterweight part; 8. High-pressure side component; 81. Extension rod; 82. Locking plate; 83. Stop post; 84. Anti-detachment cap; 85. Stud; 86. Nut. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments.

[0022] Specific embodiment 1 of the transformer substation enclosure provided by the present invention: See appendix Figure 1 The transformer enclosure includes an enclosure body 1, a low-voltage door 2, a high-voltage door 3, a low-voltage side door lock 4, a high-voltage side door lock 5, and an interlocking device.

[0023] The outer casing 1 is a box-shaped structure, which contains three compartments: a low-voltage compartment, a high-voltage compartment, and a circuit breaker compartment. Door openings are provided on one side wall of the outer casing 1 at the positions corresponding to the low-voltage compartment and the high-voltage compartment. The low-voltage door 2 is installed at the door opening position of the low-voltage compartment, and the high-voltage door 3 is installed at the door opening position of the high-voltage compartment.

[0024] Both low-pressure door 2 and high-pressure door 3 are double doors with two door panels. A vertically extending doorpost 13 is set in the middle of the doorway. The two door panels are respectively installed on the left and right sides of the door frame by hinges, and the sides of the two door panels that are close to each other are joined with the doorpost 13. The upper part of the door frame is the upper threshold 11, and the lower part of the door frame is the lower threshold 12. The upper threshold 11, the lower threshold 12, and the doorpost 13 are all provided with a stop structure for overlapping and fitting with the edge of the door panel.

[0025] Low-voltage side door lock 4 is installed on each door panel of low-voltage door 2, and high-voltage side door lock 5 is installed on each door panel of high-voltage door 3. The main structure and principle of low-voltage side door lock 4 and high-voltage side door lock 5 are the same. The transformer substation in this embodiment is mainly used in outdoor environments. Both low-voltage door 2 and high-voltage door 3 open outwards, and the door locks are all located on the inside of the doors.

[0026] Both the low-pressure side door lock 4 and the high-pressure side door lock 5 include a lock installed on the door panel near the doorpost 13. Locking rods extend from the upper and lower sides of the locks, with the upper locking rod 41 extending upward and the lower locking rod 42 extending downward. The upper locking rod 41 extends to the upper edge of the door panel, and the lower locking rod 42 extends to the lower edge of the door panel. The locking rods can move up and down under the drive of the locks. A guide is also provided on the inner side of the door panel to guide the up and down movement of the locking rods.

[0027] When the door panel is closed and needs to be locked, the operator uses the key to rotate the lock cylinder, which causes the upper locking rod 41 to move upward and its upper end to extend beyond the upper edge of the door panel and reach the inner side of the upper sill 11, where it abuts against the inner side of the upper sill 11; the lower locking rod 42 moves downward and its lower end to extend beyond the lower edge of the door panel and reach the inner side of the lower sill 12, where it abuts against the inner side of the lower sill 12.

[0028] The upper locking rod 41 and the lower locking rod 42 lock the upper and lower sides of the door panel respectively. In order to further improve the locking effect of the door panel, the lock is also equipped with a locking plate 51 that can rotate synchronously during the locking process. After the locking plate 51 rotates to the inside of the door post 13 and abuts against the inner side of the door post 13, the middle part of the door panel can be locked.

[0029] The specific structure of the aforementioned door lock belongs to existing mature technology and has been applied in various transformer substation equipment. In existing door locks, the lock plate 51 is an optional accessory. The interlocking device in this invention needs to cooperate with the lock plate 51 in the high-voltage side door lock 5. Therefore, the high-voltage side door lock 5 needs to be equipped with the lock plate 51, while the low-voltage side door lock 4 does not need to be equipped with the lock plate 51.

[0030] The interlocking device works with the locking rod of the low-pressure side door lock 4 and also with the locking plate 51 of the high-pressure side door lock 5. Through mechanical interlocking, it ensures that when the low-pressure side door lock 4 is locked, the high-pressure side door lock 5 cannot be unlocked. The locking rod of the high-pressure side door lock 5 and the locking plate 51 of the low-pressure side door lock 4 do not cooperate with the interlocking device. Therefore, unless otherwise specified, the term "lock rod" refers specifically to the locking rod of the low-pressure side door lock 4, and "lock plate 51" refers specifically to the locking plate 51 of the high-pressure side door lock 5.

[0031] Combined with appendix Figure 2The interlocking device includes a lever 6 and a low-pressure side component 7 and a high-pressure side component 8 respectively disposed at both ends of the lever 6. The lever 6 passes horizontally through a partition inside the outer casing 1. The partition has an opening for the lever 6 to swing at a certain angle. One end of the lever 6 is located at the low-pressure door 2, and the other end is located at the high-pressure door 3. The lever 6 is located inside the upper threshold 11. A mounting shaft 15 is disposed inside the upper threshold 11 of the low-pressure door 2. The lever 6 has a mounting hole 61 that can be fitted onto the mounting shaft 15 and rotate with the mounting shaft 15. After the lever 6 is installed, the position of the mounting hole 61 is its fulcrum. In this invention, "horizontal lever 6" means that the lever 6 is horizontal or close to horizontal, not absolutely horizontal.

[0032] For lever 6, the lever arm on the low-pressure side is its effort arm, and the lever arm on the high-pressure side is its resistance arm. The force applied to the effort arm is provided by the weight of the low-pressure side component 7. The low-pressure side component 7 can move downward or has a tendency to move downward under its gravity. When the low-pressure side component 7 moves downward, lever 6 is in a positive rotation state.

[0033] See appendix Figure 2 and in conjunction with the appendix Figure 3 and attached Figure 4 The low-pressure side component 7 includes a mounting plate 71, which is located below the corresponding end of the lever 6 and extends downward. The mounting plate 71 is also located inside the corresponding doorpost 13 of the low-pressure door 2. A limiting elongated hole 72 is provided on the mounting plate 71, which extends vertically. A limiting post 14 is fixedly provided inside the doorpost 13. The limiting post 14 passes through the limiting elongated hole 72 and can guide the vertical movement of the mounting plate 71, while also limiting the vertical movement stroke of the mounting plate 71.

[0034] The low-pressure side component 7 also includes a support portion 73 and a counterweight portion 74 disposed on the mounting plate 71, wherein the counterweight portion 74 is located below the limiting elongated hole 72, and the support portion 73 is located above the limiting elongated hole 72. The weight of the counterweight portion 74 itself needs to reach a certain value so that the product of the gravity of the low-pressure side component 7 and the length of the power arm is greater than the product of the gravity of the high-pressure side component 8 and the resistance arm, so as to meet the action requirements of the lever 6.

[0035] The push-support part 73 has two portions extending to the left and right sides respectively from the mounting plate 71. When the low-pressure door 2 is in the locked state, see attached... Figure 5 The lower surfaces of the left and right parts of the push-support part 73 abut against the ends of the upper locking rods 41 on the two door panels of the low-pressure door 2, at which point the low-pressure side component 7 is at the upper limit position of its stroke.

[0036] After low-pressure door 2 is unlocked, see appendix. Figure 6When the upper locking rod 41 on the low-pressure door 2 moves downward, the push-bearing part 73 loses the limit of the upper locking rod 41, and the low-pressure side component 7 moves downward under its own weight. During this process, the lever 6 rotates in the forward direction until the limit post 14 stops at the upper end hole wall of the limit elongated hole 72. At this time, the low-pressure side component 7 is at the lower limit position of its stroke. At this time, the lower surface of the push-bearing part 73 does not exceed the lower edge of the upper threshold 11, so as to avoid interference between the upper locking rod 41 and the push-bearing part 73 on the low-pressure door 2 during the closing process.

[0037] When the low-pressure door 2 needs to be locked, first close the low-pressure door 2. At this time, the locking bar on the low-pressure door 2 is located below the push-support part 73. Then, the operator turns the key to move the upper locking bar 41 upward, pushing the push-support part 73 upward. During this process, the lever 6 rotates in the opposite direction, and finally the entire low-pressure side component 7 reaches the attached... Figure 5 The upper limit position of its travel is shown.

[0038] As the low-pressure side component 7 moves up and down, the high-pressure side component 8 also moves up and down, but in the opposite direction to the low-pressure side component 7. The high-pressure side component 8 includes a downwardly extending extension rod 81. The upper end of the extension rod 81 is connected to the end of the lever 6 located in the high-pressure chamber, and the lower end of the extension rod 81 is located at the locking position of the high-pressure side door lock 5. The high-pressure side component 8 also includes a locking part provided at the lower end of the extension rod 81.

[0039] See appendix Figure 7 and attached Figure 8 The locking part includes a locking plate 82 fixedly connected to the extension rod 81 by a stud 85 and a nut 86. The thickness direction of the locking plate 82 is parallel to the opening and closing direction of the high-pressure door 3. A stop post 83 is fixed on the locking plate 82, and the length direction of the stop post 83 is parallel to the thickness direction of the locking plate 82. See appendix. Figure 9 and attached Figure 10 When the high-pressure side door lock 5 is locked, its locking plate 51 is horizontal and located inside the door post 13. To unlock the high-pressure side door lock 5, the locking plate 51 needs to be rotated upwards. The two stop posts 83 on the locking plate 82 correspond to the locking plates 51 of the two high-pressure side door locks 5, respectively. (See attached diagram.) Figure 9 Furthermore, when the high-voltage side component 8 is in the lower limit position, the stop post 83 is exactly located on the unlocking rotation path of the lock plate 51, preventing the lock plate 51 from rotating upward, thus preventing the high-voltage side door lock 5 from unlocking and the high-voltage door 3 from being opened.

[0040] When the high-voltage side component 8 is in the lower limit position, the low-voltage side component 7 is in the upper limit position. Moreover, the low-voltage side component 7 is pushed down by the upper locking rod 41 of the low-voltage side door lock 4, so the high-voltage side component 8 cannot move up at this time.

[0041] To open the high-pressure door 3, the low-pressure side door lock 4 must first be unlocked. After the low-pressure side door lock 4 is unlocked, the low-pressure side component 7 moves downward, the lever 6 reverses, and drives the high-pressure side component 8 upward, causing the stop post 83 to leave the unlocking rotation path of the lock plate 51. See Appendix Figure 10 At this time, the locking plate 51 can rotate upward, and the high-pressure side door lock 5 can also be unlocked, so that the high-pressure door 3 can be opened from the outside.

[0042] When the locking plate 51 is in a horizontal state, its upper edge is provided with a snap-fit ​​notch 52 at the position corresponding to the stop post 83, for the stop post 83 to engage. The end of the stop post 83 is provided with an anti-disengagement cap 84 to prevent axial disengagement after the stop post 83 is engaged with the snap-fit ​​notch 52. The anti-disengagement cap 84, the stop post 83, and the locking plate 82 form an annular groove for the locking plate 51 to engage. After the snap-fit ​​notch 52 and the stop post 83 engage, the stability and reliability of their blocking are enhanced.

[0043] In this embodiment, the fulcrum of lever 6 is biased towards the low-pressure side, making the length of the power arm less than the length of the resistance arm. The main reason for this arrangement is that the locking rod moves up and down with a smaller amplitude, thus the up-and-down travel of the low-pressure side component 7 is correspondingly shorter; while to completely avoid the rotation path of the locking plate 51, the up-and-down travel of the high-pressure side component 8 is longer. Therefore, this arrangement ensures that the travel of the high-pressure side component 8 and the low-pressure side component 7 is matched. In other embodiments, the fulcrum position of lever 6 can be adjusted according to the actual structure and dimensions.

[0044] During rotation, the trajectory of the end of lever 6 is not perfectly vertical, but rather an arc around the fulcrum. Therefore, theoretically, the low-pressure side component 7 and the high-pressure side component 8 will also experience a slight horizontal offset during vertical movement. However, since the lengths of the effort arm and resistance arm of lever 6 are relatively long compared to the rotation amplitude of lever 6, the trajectory of the end of lever 6 can be considered a straight line locally. The clearances between lever 6, low-pressure side component 7, and high-pressure side component 8 and other structures are sufficient to accommodate the slight offset during the rotation of lever 6, and no interference will occur.

[0045] To prevent the locking plate 51 from colliding with the locking plate 82 during rotation, the locking plate 82 can be thinned, or a guide slope can be provided at the edge of the locking plate 82. Alternatively, a groove can be provided on the inner side of the doorpost 13 for the locking plate 82 to be inserted and slide up and down. The depth of the groove is equal to the thickness of the locking plate 82, so that the surface of the locking plate 82 can be flush with the surface of the doorpost 13, thus avoiding collision.

[0046] In order to limit and guide the high-voltage side component 8, an elongated hole for limiting can also be provided on the extension rod 81, and a pin inserted into the elongated hole can be provided on the corresponding gate post 13. The elongated hole is longer than the limiting length on the mounting plate of the low-voltage side component 7.

[0047] Specific embodiment 2 of the transformer substation housing provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the locking part in this embodiment is a stop block fixed to the lower end of the extension rod. The lower side of the stop block can directly engage with the upper edge of the locking piece.

[0048] Specific embodiment 3 of the transformer substation enclosure provided by the present invention: This embodiment is based on Embodiment 1, but differs in that the lever is installed at the lower threshold in this embodiment, and the upper side of the push-bearing part abuts against the lower end of the lower locking rod at the low-pressure door. The extension rod extends upward, and the locking plate is installed at the upper end of the extension rod. The stop post is used to stop and cooperate with the lower edge of the lock plate. This embodiment is suitable for the case where the lock plate is rotated downward to unlock.

[0049] In this embodiment, the fulcrum is still biased towards the low-pressure side. Since the resistance arm is longer, its weight is naturally greater than that of the power arm. Therefore, in this embodiment, there is no need to set a counterweight in the low-pressure side component, so that the low-pressure side component can move upward spontaneously.

[0050] Specific embodiment 4 of the transformer substation housing provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that in this embodiment, an elastic element is provided between one end of the high-pressure side component of the lever and the top wall of the outer shell. The elastic element is a tension spring. During use, the tension spring is always kept in a stretched state. In this way, the elastic force generated by the tension spring can also ensure that the low-pressure side component moves downward after the upper locking rod limit is lost, without the need to set a counterweight.

[0051] In other embodiments of this implementation, the elastic element can be a thrust spring, in which case the thrust spring needs to be disposed between one end of the lever setting low-pressure side component and the top wall of the outer casing.

[0052] Specific embodiments of the high and low pressure door interlocking device provided by the present invention: The specific structure of this high- and low-voltage door interlocking device is the same as that of the interlocking device in the above-described embodiment of the transformer substation enclosure, and will not be described again.

[0053] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A transformer substation enclosure, comprising an enclosure body, a low-voltage door, a high-voltage door, and low-voltage side door locks and high-voltage side door locks, characterized in that, It also includes an interlocking device, which includes a lever horizontally installed at the upper or lower sill of the main body of the housing. The lever has a low-pressure side component and a high-pressure side component at its two ends. The lever can rotate forward under the action of weight imbalance on both sides of the fulcrum or by configuring an elastic element and under the elastic force of the elastic element, thereby causing the low-pressure side component to move vertically towards the low-pressure door. The low-pressure side component includes a push-bearing part, and the high-pressure side component includes an extension rod that is connected to the lever and extends vertically, and a locking part that is connected to the end of the extension rod and can cooperate with the lock plate of the high-pressure side door lock. During the locking process of the low-pressure door, the lock rod end of the low-pressure side door lock pushes the push-bearing part, causing the lever to rotate in the opposite direction, thereby causing the locking part to block the unlocking rotation path of the lock plate. After the low-pressure door is unlocked, the push-bearing part loses the limitation of the lock rod, the lever rotates forward, and thus drives the locking part away from the unlocking rotation path of the lock plate.

2. The transformer substation enclosure according to claim 1, characterized in that, The fulcrum of the lever is positioned close to the low-pressure side end so that the distance from the fulcrum to the low-pressure side end is less than the distance from the fulcrum to the high-pressure side end.

3. The transformer substation enclosure according to claim 1 or 2, characterized in that, The lever is able to rotate in the forward direction under the action of weight imbalance on both sides of the fulcrum, and the lever is set at the upper threshold of the housing body. The low-pressure side component also includes a counterweight for providing a downward force to the low-pressure side end of the lever.

4. The transformer substation enclosure according to claim 3, characterized in that, The low-pressure side component also includes a mounting plate connected to the corresponding end of the lever. The push-bearing part and the counterweight part are both set on the mounting plate and arranged vertically. The mounting plate is provided with a vertically extending limiting elongated hole. The outer shell body is fixed with a limiting post for passing through the limiting elongated hole and guiding and limiting the vertical movement of the mounting plate.

5. The transformer substation enclosure according to claim 1 or 2, characterized in that, The locking part includes a locking plate that is fixedly connected to the extension rod. A stop post is fixedly provided on the locking plate, and the locking plate is provided with a snap-fit ​​notch for the stop post to be engaged.

6. A high-low pressure door interlocking device, characterized in that, The device includes a lever for horizontal installation, with a low-pressure side component and a high-pressure side component at each end. In use, the lever can rotate forward under the influence of weight imbalance on both sides of the fulcrum or by configuring an elastic element and rotating under the elastic force of the elastic element, thereby causing the low-pressure side component to move vertically towards the low-pressure door. The low-pressure side component includes a push-bearing part, and the high-pressure side component includes an extension rod that is connected to the lever and extends vertically, and a locking part connected to the end of the extension rod. In use, the push-bearing part can move vertically under the push of the lock bar of the low-pressure side door lock, causing the lever to rotate in the opposite direction, thereby causing the locking part to block the unlocking rotation path of the lock plate. The push-bearing part can also move towards the low-pressure door after the low-pressure door is unlocked, causing the lever to rotate forward, thereby causing the locking part to leave the unlocking rotation path of the lock plate.

7. The high and low pressure door interlocking device according to claim 6, characterized in that, The fulcrum of the lever is positioned close to the low-pressure side end so that the distance from the fulcrum to the low-pressure side end is less than the distance from the fulcrum to the high-pressure side end.

8. The high-low pressure door interlocking device according to claim 6 or 7, characterized in that, The lever can rotate in the forward direction under the effect of the weight imbalance on both sides of the fulcrum, and the low-pressure side component also includes a counterweight for providing a downward force to the low-pressure side end of the lever.

9. The high and low pressure door interlocking device according to claim 8, characterized in that, the low pressure... The side component also includes a mounting plate connected to the corresponding end of the lever. The push part and the counterweight part are both set on the mounting plate and arranged vertically. The mounting plate is provided with a vertically extending limiting hole.

10. The high-low pressure door interlocking device according to claim 6 or 7, characterized in that, The locking part includes a locking plate that is fixedly connected to the extension rod, and a stop post for engaging with the locking plate is fixedly provided on the locking plate.

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