A normally closed switch state switching device for a substation

Abstract

The present invention belongs to the technical field of substation switch equipment, and particularly relates to a normally closed switch state switching device for a substation, comprising an upper plate and a lower plate, wherein normally closed contact assemblies are arranged on both sides above the upper plate, and fixing seats are arranged on both sides below the normally closed contact assembly, and lower limit assemblies for limiting the downward travel of the normally closed contact assembly are arranged on both sides of the upper plate corresponding to the normally closed contact assembly; insulating shells are arranged on both sides below the lower plate corresponding to the normally closed contact assembly, and normally closed contact seats electrically connected to the normally closed contact assembly are arranged inside the insulating shells; guide sleeves are arranged on the outside of the insulating shells, and operating rods are arranged inside the guide sleeves, and one end of the outer side of the operating rods is connected to a mechanical operating device, and the mechanical operating device drives the corresponding operating rod to move to realize the state switching of the normally closed contact seat and the normally closed contact assembly; the present invention has the advantages of stable normally closed state, fast, reliable and timely switching, and avoidance of fault expansion.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer substation switch equipment, and in particular relates to a transformer substation normally closed switch state switching device. Background Art

[0002] Normally closed switches in substations are important components of power systems. They play a key role in ensuring the reliability and safety of power supply. Normally closed switches are switches that are in a closed state when there is no external force (such as no power or no button pressed). When a certain force or voltage is applied, the switch will be disconnected. At this time, there is no passage between the two terminals, thereby controlling the switch of electrical appliances, machines and other equipment. For example, in a dual bus system, the bus tie switch is often in a closed state so that a part of the equipment can be quickly switched from one bus to another bus when needed, thereby ensuring the continuity of power supply. When the bus tie switch is closed, if a bus fails, the bus differential protection will act quickly, first tripping the bus tie switch to cut off the faulty bus and protecting the other bus to continue running, thereby reducing the scope of power outage. However, when the existing normally closed switch switching device detects an abnormality or failure of the equipment, it is impossible to realize the normal closed switch to quickly and reliably disconnect the circuit, thereby causing the fault to expand and damage the equipment; therefore, it is very necessary to provide a substation normally closed switch state switching device with a simple structure, stable normally closed state, fast, reliable and timely switching, and avoidance of fault expansion. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a substation normally closed switch state switching device with a simple structure, stable normally closed state, fast, reliable and timely switching, and avoidance of fault expansion.

[0004] The objective of the present invention is achieved as follows: A normally closed switch state switching device for a substation comprises an upper plate and a lower plate, wherein normally closed contact assemblies are arranged on both sides above the upper plate, and fixed seats are arranged on both sides below the normally closed contact assemblies, and lower limit assemblies for limiting the downward travel of the normally closed contact assemblies are arranged on both sides of the upper plate corresponding to the normally closed contact assemblies; insulating shells are arranged on both sides below the lower plate corresponding to the normally closed contact assemblies, and normally closed contact seats electrically connected to the normally closed contact assemblies are arranged inside the insulating shells; guide sleeves are arranged on the outside of the insulating shells, and operating rods are arranged inside the guide sleeves, and one end of the outer side of the operating rods is connected to a mechanical operating device, and the mechanical operating device drives the corresponding operating rod to move to realize the state switching of the normally closed electrical connection between the normally closed contact seat and the normally closed contact assembly.

[0005] The upper plate and the lower plate are connected via a plurality of connection columns, wherein the connection columns include an inner groove positioning column connected to the bottom of the upper plate and an outer convex ridge positioning column connected to the top of the lower plate.

[0006] A connecting column is provided on the left side, the middle and the right side between the upper plate and the lower plate, and the inwardly concave groove of the inner groove positioning column of the connecting column cooperates with the outwardly protruding ridge of the outer ridge positioning column to dock and position, and then the upper plate, the connecting column and the lower plate are penetrated by bolts to achieve a stable connection between the upper plate and the lower plate, thereby ensuring the stability of the switch of the present invention when in use; in addition, a plurality of connecting columns are provided between the upper plate and the lower plate, so that there is a spacing between the upper plate and the lower plate, which can ensure that the normally closed head of the normally closed contact assembly can pass through the through hole on the lower plate for movement.

[0007] The normally closed contact assembly includes a base plate, arc portions are arranged on both sides above the base plate, a movable plate is arranged below the arc portions, an axle pin is arranged inside the movable plate, and a limiting convex plate is arranged below the inner side of the movable plate.

[0008] The shaft pin cooperates with the vertical movable groove to realize the up and down guiding movement, so that the state switching action of the normally closed contact assembly is stable and reliable, and the state switching failure and danger caused by tilting or jamming of the action are avoided; the limit convex plate cooperates with the lower limit assembly to realize the limiting action when the normally closed contact assembly moves downward to restore the normally closed state. When the limit convex plate contacts the limiting rod of the lower limit assembly, the mechanical operating device is triggered to drive the normally closed contact seat to move, thereby realizing the normally closed connection with the normally closed contact assembly, avoiding excessive downward pressure due to the lack of limiting action, which makes it unclear whether the recovery operation has been achieved.

[0009] A first compression spring is arranged below the base plate, a normally closed rod penetrating the upper plate and the lower plate is arranged inside the first compression spring, a normally closed head is arranged at one end of the normally closed rod penetrating the lower plate and extending downward, and a through hole cooperating with the normally closed head is arranged on the lower plate.

[0010] The normally closed contact assembly realizes a normally closed connection with the normally closed contact seat through the normally closed head; the pre-compressed first compression spring drives the normally closed head to move through the normally closed rod, so that the normally closed head releases the normally closed connection state with the normally closed contact seat to realize state switching.

[0011] The fixed seat is arranged on both sides of the movable plate and is movably connected to the movable plate. A vertical movable groove for limiting the up and down movement of the axle pin is arranged in front of the fixed seat; the lower limit assembly is an "L"-shaped structure as a whole, including a limit plate located at the bottom of the upper flat plate, and a limit rod is arranged above the limit plate, which passes through the upper flat plate and is docked with the limit convex plate for limiting the position.

[0012] The normally closed contact seat includes a group of movable contact plates, each of which is provided with a closed top plate extending inwardly above the movable contact plates, and the lower connection parts are movably connected by a pin shaft, a torsion spring is installed outside the pin shaft, and the upper ends of the torsion spring are respectively inserted into the matching positioning grooves provided on the movable contact plates.

[0013] The normally closed contact seat is connected to the normally closed head through a group of movable contact plates close to each other, and the normally closed head is positioned inside the normally closed contact seat by cooperating with the closed top plate, thereby realizing the normally closed connection state between the normally closed contact assembly and the normally closed contact seat; the torsion spring drives a group of movable contact plates to rotate around the pin shaft at the bottom connection, so that the upper parts of a group of movable contact plates are away from each other and are in an open state, and the normally closed head is separated from the normally closed contact seat under the action of the first compression spring, thereby realizing state switching.

[0014] The mechanical operating device is a stepping operating mechanism, which includes a base, a group of transverse linear slides are arranged at intervals on the left side in front of the base, and the transverse linear slides are connected by a stepping guide rod. A fixed plate is arranged at one end of the transverse linear slide close to the right side of the base, and a tension spring connected to the transverse linear slide close to the left side of the base is installed on the fixed plate. A long-stroke electromagnet seat is arranged on the right side in front of the base, and one end of the stepping guide rod is connected to the long-stroke electromagnet seat through a first slide rod, and the other end is connected to the operating rod.

[0015] A longitudinal linear slide is arranged on the left side below the front of the base, a stop ratchet is arranged inside the longitudinal linear slide, the stop ratchet is connected to the longitudinal linear slide through a second compression spring, the lower end of the stop ratchet is connected to the first electromagnet seat through a corresponding first slide rod, and a plurality of positioning teeth are arranged at the corresponding stop ratchet below the stepping guide rod.

[0016] The mechanical operating device is a stepping operating mechanism, which can drive the normally closed contact seat to move, so as to realize fast and reliable switching between the normally closed connected state and the disconnected state of the normally closed contact seat and the normally closed contact, thereby solving the problem that the existing normally closed switch switching device cannot realize the fast and reliable disconnection of the normally closed switch, resulting in the expansion of faults.

[0017] The mechanical operating device is a straight-moving operating mechanism, which includes a frame, a second electromagnet seat is arranged at the lower part of the frame, a hinge seat is arranged in front of the second electromagnet seat, a swing arm is movably connected inside the hinge seat, and the swing arm is connected to the second electromagnet seat through a second sliding rod.

[0018] A linear spring bearing seat is arranged above the frame, an end cover is arranged on the right side of the linear spring bearing seat, a third compression spring is arranged inside the linear spring bearing seat, a straight-moving push rod is arranged inside the third compression spring, one end of the straight-moving push rod is connected to the upper end of the swing arm, and the other end is connected to the operating rod.

[0019] The mechanical operating device can be replaced by a straight-moving operating mechanism. The same straight-moving operating mechanism can drive the normally closed contact seat to move, thereby realizing fast and reliable switching between the normally closed connected state and the disconnected state of the normally closed contact seat and the normally closed contact, thereby solving the problem that when the existing normally closed switch switching device detects equipment abnormality or failure, the equipment is damaged due to unreliable or untimely switching action.

[0020] The beneficial effects of the present invention are as follows: the present invention is a normally closed switch state switching device for a substation. In use, under normal conditions, the normally closed head is inside the normally closed contact seat. At this time, the switch of the present invention is in the normally closed state. When the state switching is required, it is only necessary to drive the operating rod to slide outward inside the guide sleeve through the mechanical operating device. At this time, the operating rod no longer presses the movable contact plate tightly. The movable contact plate rotates around the bottom pin shaft under the action of the torsion spring, and the upper part of the movable touch plate opens. At this time, the normally closed head is separated from the normally closed contact seat under the action of the first compression spring, and the connection state between the normally closed contact assembly and the normally closed contact seat is released, so as to realize rapid state switching. The movable groove of the fixed seat restricts the shaft pin to move only up and down and limits the movement range, so as to ensure that the normally closed contact assembly can move up and down smoothly and reliably, and then ensure that the normally closed head is separated from or connected to the normally closed contact seat stably and reliably, finally realizing rapid, reliable and timely state switching action, realizing rapid and reliable disconnection of the normally closed switch, thereby avoiding the expansion of faults and effectively protecting the equipment. The present invention has the advantages of simple structure, stable normally closed state, rapid, reliable and timely switching, and avoiding the expansion of faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a front view of a normally closed switch state switching device for a substation.

[0022] Figure 2 For the present invention Figure 1 A three-dimensional diagram of part of the structure.

[0023] Figure 3 For the present invention Figure 2 Bottom view of .

[0024] Figure 4 For the present invention Figure 1 Schematic diagram of the internal structure of the normally closed contact seat.

[0025] Figure 5 It is a partial structural exploded diagram of a normally closed switch state switching device for a substation according to the present invention.

[0026] Figure 6 It is a schematic diagram of a first embodiment of a mechanical operating device of a normally closed switch state switching device of a substation according to the present invention.

[0027] Figure 7 For the present invention Figure 6 Front view of .

[0028] Figure 8 It is a schematic diagram of a second embodiment of a mechanical operating device of a normally closed switch state switching device of a substation according to the present invention.

[0029] Fig. 9 For the present invention Figure 8 Side view of.

[0030] In the figure: 1, upper plate 2, lower plate 3, connecting column 31, inner groove positioning column 32, outer convex ridge positioning column 4, normally closed contact assembly 41, base plate 42, arc portion 43, movable plate 44, shaft pin 45, limiting convex plate 46, first compression spring 47, normally closed rod 48, normally closed head 5, fixed seat 51, movable groove 6, lower limiting assembly 61, limiting plate 62, limiting rod 7, insulating shell 8, guide sleeve 9, operating rod 10, mechanical operating device 11, normally closed contact seat 101, movable contact plate 102, closed top plate 103, pin 104, torsion spring 105, matching positioning Slot 12, through hole 20, stepping operating mechanism 201, base 202, transverse linear slide 203, stepping guide rod 204, fixing plate 205, tension spring 206, long stroke electromagnet seat 207, first slide bar 208, longitudinal linear slide 209, stop ratchet 210, second compression spring 211, first electromagnet seat 212, positioning tooth 30, straight operating mechanism 301, frame 302, second electromagnet seat 303, hinge seat 304, swing arm 305, second slide bar 306, linear spring bearing seat 307, straight push rod 308, third compression spring 309, end cover. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings. Example

[0032] like Figure 1-7As shown, a normally closed switch state switching device for a substation comprises an upper plate 1 and a lower plate 2, wherein normally closed contact assemblies 4 are arranged on both sides above the upper plate 1, and fixing seats 5 are arranged on both sides below the normally closed contact assemblies 4, and lower limit assemblies 6 for limiting the downward travel of the normally closed contact assemblies 4 are arranged on both sides of the upper plate 1 corresponding to the normally closed contact assemblies 4; insulating shells 7 are arranged on both sides below the lower plate 2 corresponding to the normally closed contact assemblies 4, and normally closed contact seats 11 electrically connected to the normally closed contact assemblies 4 are arranged inside the insulating shells 7; guide sleeves 8 are arranged on the outside of the insulating shells 7, and operating rods 9 are arranged inside the guide sleeves 8, and one end of the outer side of the operating rods 9 is connected to a mechanical operating device 10, and the mechanical operating device 10 drives the corresponding operating rod 9 to move to realize the state switching of the normally closed contact seat 11 electrically connected to the normally closed contact assembly 4.

[0033] The upper plate 1 and the lower plate 2 are connected via a plurality of connecting columns 3 , wherein the connecting columns 3 include an inner groove positioning column 31 connected to the bottom of the upper plate 1 and an outer convex ridge positioning column 32 connected to the top of the lower plate 2 .

[0034] The normally closed contact assembly 4 includes a base plate 41 , arc portions 42 are provided on both sides above the base plate 41 , movable plates 43 are provided below the arc portions 42 , shaft pins 44 are provided inside the movable plates 43 , and limiting convex plates 45 are provided below the inner side of the movable plates 43 .

[0035] A first compression spring 46 is arranged below the base plate 41, and a normally closed rod 47 penetrating the upper plate 1 and the lower plate 2 is arranged inside the first compression spring 46, and a normally closed head 48 is arranged at one end of the normally closed rod 47 penetrating the lower plate 2 and extending downward, and a through hole 12 cooperating with the normally closed head 48 is arranged on the lower plate 2.

[0036] In this embodiment, the working principle of the normally closed contact assembly is as follows: in the initial state, the normally closed head is located inside the normally closed contact seat and the first compression spring is in a pre-compression state at this time, the shaft pin is located at the lower part of the movable groove, and the limit convex plate contacts the top of the limit rod. At this time, the normally closed contact assembly and the normally closed contact seat are in a connected state, that is, the switch of the present invention is in a connected state; when the normally closed contact seat and the normally closed contact assembly are switched to a normally closed connection state, the first compression spring in the pre-compression state drives the normally closed rod and the movable plate to move up, and the shaft pin moves up in the movable groove, so that the normally closed head is driven to separate from the normally closed contact seat by the normally closed rod, and the connection between the two is released, thereby realizing state switching; when it is necessary to restore to the connected state, it is only necessary to press the normally closed contact assembly downward through the corresponding push switch, so that the arc-shaped portion and the substrate drive the first compression spring, the normally closed rod, and the movable plate to move downward, and the shaft pin moves downward in the movable groove, so that the normally closed head is driven to connect to the normally closed contact seat by the normally closed rod, thereby realizing state switching.

[0037] The fixed seat 5 is arranged on both sides of the movable plate 43 and is movably connected to the movable plate 43. A vertical movable groove 51 for limiting the up and down movement of the axle pin 44 is arranged in front of the fixed seat 5; the lower limit assembly 6 is an "L"-shaped structure as a whole, including a limit plate 61 located at the bottom of the upper flat plate 1, and a limit rod 62 is arranged above the limit plate 61, which passes through the upper flat plate 1 and docks with the limit convex plate 45 for limiting the position.

[0038] In this embodiment, the movable groove on the fixed seat limits the shaft pin to move only up and down, ensuring that the movable plate of the normally closed contact assembly can move up and down reliably, thereby ensuring that the normally closed head is stably and reliably separated from or connected to the normally closed contact seat; the limit rod of the lower limit assembly performs a limiting operation on the limiting convex plate, that is, when the normally closed contact assembly is restored from a state disconnected from the normally closed contact seat to a state connected to the normally closed contact seat, the downward movement stroke of the movable plate of the normally closed contact assembly is limited.

[0039] The normally closed contact seat 11 includes a group of movable contact plates 101, each of which is provided with a closed top plate 102 extending inwardly above the movable contact plates 101, and the lower connection parts are movably connected through a pin shaft 103, and a torsion spring 104 is installed outside the pin shaft 103, and the upper ends of the torsion spring 104 are respectively inserted into the matching positioning grooves 105 provided on the movable contact plates 101.

[0040] The mechanical operating device 10 is a stepping operating mechanism 20, which includes a base 201. A group of transverse linear slides 202 are arranged at intervals on the left side in front of the base 201. The transverse linear slides 202 are connected by stepping guide rods 203. A fixed plate 204 is arranged at one end of the transverse linear slide 202 close to the right side of the base 201. A tension spring 205 connected to the transverse linear slide 202 close to the left side of the base 201 is installed on the fixed plate 204. A long-stroke electromagnet seat 206 is arranged on the right side in front of the base 201. One end of the stepping guide rod 203 is connected to the long-stroke electromagnet seat 206 through a first slide rod 207, and the other end is connected to the operating rod 9.

[0041] A longitudinal linear slide 208 is arranged on the left side of the lower front side of the base 201, and a stop ratchet 209 is arranged inside the longitudinal linear slide 208. The stop ratchet 209 is connected to the longitudinal linear slide 208 through a second compression spring 210, and the lower end of the stop ratchet 209 is connected to the first electromagnet seat 211 through the corresponding first slide rod 207. A plurality of positioning teeth 212 are arranged at the corresponding stop ratchet 209 below the stepping guide rod 203.

[0042] In this embodiment, the working principle of the stepping operating mechanism and the normally closed contact seat is as follows: in the initial state, the two movable contact plates of the normally closed contact seat are close to each other and cooperate with the closed top plate above to position the normally closed head inside the normally closed contact seat, thereby realizing the normally closed connection state of the normally closed contact assembly and the normally closed contact seat; when the state switching is required, the long-stroke electromagnet seat drives the stepping guide rod to move inside the transverse linear slide seat through the first slide rod, thereby realizing that the stepping guide rod drives the operating rod to move away from the corresponding movable contact plate. When the stepping guide rod moves to the innermost end (that is, the fixed plate moves in the direction close to the long-stroke electromagnet seat and pulls the tension spring), the positioning tooth presses the stop ratchet downward, and the stop ratchet rises under the action of the second compression spring, and the positioning tooth presses the stop ratchet downward again until the stepping guide rod completely moves to the innermost end and stops. The stop ratchet cooperates with the positioning tooth under the action of the second compression spring to realize the state locking of the stepping guide rod and the operating rod. At this time, the operating rod is completely disengaged from the corresponding movable contact plate When the first electromagnetic seat is in the state of being closed, the first electromagnetic seat is used to move the stop ratchet, so that the stop ratchet is disengaged from the positioning tooth, and the state locking of the stepping guide rod and the operating rod is released. The stepping guide rod is quickly restored under the action of the tension spring, that is, the stepping guide rod drives the operating rod to move inward and press the corresponding movable contact plate tightly. The two movable contact plates of the normally closed contact seat approach each other and cooperate with the closed top plate above to position the normally closed head inside the normally closed contact seat, so as to realize the normally closed connection state between the normally closed contact assembly and the normally closed contact seat, and realize the state switching.

[0043] The present invention is a normally closed switch state switching device for a substation. In use, under normal conditions, the normally closed head 48 is inside the normally closed contact seat 11. At this time, the switch of the present invention is in a normally closed state. When the state needs to be switched, the operating rod 9 only needs to be driven by the mechanical operating device 10 to slide outward inside the guide sleeve 8. At this time, the operating rod 9 no longer presses against the movable contact plate 101. The movable contact plate 101 rotates around the bottom pin 103 under the action of the torsion spring 104, and the upper part of the movable contact plate 101 is opened. At this time, the normally closed head 48 is separated from the normally closed contact seat 11 under the action of the first compression spring 46, and the normally closed contact is released. The connection state between the component 4 and the normally closed contact seat 11 realizes rapid state switching, and the movable groove 51 of the fixed seat 5 restricts the shaft pin 44 to move up and down and limits the moving range, thereby ensuring that the normally closed contact component 4 can move up and down smoothly and reliably, and then ensuring that the normally closed head 48 is stably and reliably disconnected from or connected to the normally closed contact seat 11, and finally realizing rapid, reliable and timely state switching action, realizing rapid and reliable circuit disconnection of the normally closed switch, thereby avoiding the expansion of faults and effectively protecting the equipment; the present invention has the advantages of simple structure, stable normally closed state, rapid, reliable and timely switching, and avoiding the expansion of faults. Example

[0044] like Figure 1-5 and Figure 8-9 As shown, a normally closed switch state switching device for a substation comprises an upper plate 1 and a lower plate 2, wherein normally closed contact assemblies 4 are arranged on both sides above the upper plate 1, and fixing seats 5 are arranged on both sides below the normally closed contact assemblies 4, and lower limit assemblies 6 for limiting the downward travel of the normally closed contact assemblies 4 are arranged on both sides of the upper plate 1 corresponding to the normally closed contact assemblies 4; insulating shells 7 are arranged on both sides below the lower plate 2 corresponding to the normally closed contact assemblies 4, and normally closed contact seats 11 electrically connected to the normally closed contact assemblies 4 are arranged inside the insulating shells 7; guide sleeves 8 are arranged on the outside of the insulating shells 7, and operating rods 9 are arranged inside the guide sleeves 8, and one end of the outer side of the operating rods 9 is connected to a mechanical operating device 10, and the mechanical operating device 10 drives the corresponding operating rod 9 to move to realize the state switching of the normally closed contact seat 11 electrically connected to the normally closed contact assembly 4.

[0045] The upper plate 1 and the lower plate 2 are connected via a plurality of connecting columns 3 , wherein the connecting columns 3 include an inner groove positioning column 31 connected to the bottom of the upper plate 1 and an outer convex ridge positioning column 32 connected to the top of the lower plate 2 .

[0046] The normally closed contact assembly 4 includes a base plate 41 , arc portions 42 are provided on both sides above the base plate 41 , movable plates 43 are provided below the arc portions 42 , shaft pins 44 are provided inside the movable plates 43 , and limiting convex plates 45 are provided below the inner side of the movable plates 43 .

[0047] A first compression spring 46 is arranged below the base plate 41, and a normally closed rod 47 penetrating the upper plate 1 and the lower plate 2 is arranged inside the first compression spring 46, and a normally closed head 48 is arranged at one end of the normally closed rod 47 penetrating the lower plate 2 and extending downward, and a through hole 12 cooperating with the normally closed head 48 is arranged on the lower plate 2.

[0048] The fixed seat 5 is arranged on both sides of the movable plate 43 and is movably connected to the movable plate 43. A vertical movable groove 51 for limiting the up and down movement of the axle pin 44 is arranged in front of the fixed seat 5; the lower limit assembly 6 is an "L"-shaped structure as a whole, including a limit plate 61 located at the bottom of the upper flat plate 1, and a limit rod 62 is arranged above the limit plate 61, which passes through the upper flat plate 1 and docks with the limit convex plate 45 for limiting the position.

[0049] The normally closed contact seat 11 includes a group of movable contact plates 101, each of which is provided with a closed top plate 102 extending inwardly above the movable contact plates 101, and the lower connection parts are movably connected through a pin shaft 103, and a torsion spring 104 is installed outside the pin shaft 103, and the upper ends of the torsion spring 104 are respectively inserted into the matching positioning grooves 105 provided on the movable contact plates 101.

[0050] The mechanical operating device 10 is a straight-moving operating mechanism 30, which includes a frame 301, a second electromagnet seat 302 is arranged at the lower part of the frame 301, a hinge seat 303 is arranged in front of the second electromagnet seat 302, a swing arm 304 is movably connected inside the hinge seat 303, and the swing arm 304 is connected to the second electromagnet seat 302 through a second sliding rod 305.

[0051] A linear spring bearing seat 306 is arranged above the frame 301, an end cover 309 is arranged on the right side of the linear spring bearing seat 306, a third compression spring 308 is arranged inside the linear spring bearing seat 306, a straight push rod 307 is arranged inside the third compression spring 308, one end of the straight push rod 307 is connected to the upper end of the swing arm 304, and the other end is connected to the operating rod 9.

[0052] In this embodiment, the working principle of the straight-moving operating mechanism and the normally closed contact seat is as follows: in the initial state, the two movable contact plates of the normally closed contact seat are close to each other and the normally closed head is positioned inside the normally closed contact seat through the cooperation of the upper closed top plate, so as to realize the normally closed connection state between the normally closed contact assembly and the normally closed contact seat;

[0053] When the state needs to be switched, the second electromagnet seat drives the lower end of the swing arm to rotate around the hinge seat through the second sliding rod, and the upper end of the swing arm pulls the straight push rod to move inside the linear spring bearing seat and squeezes the third compression spring, thereby realizing that the straight push rod drives the operating rod to move and disengage from the corresponding movable touch plate. At this time, the operating rod is completely disengaged from the corresponding movable touch plate, that is, when the operating rod no longer presses the movable touch plate, the movable touch plate rotates around the bottom pin shaft under the action of the torsion spring, and the upper part of the movable touch plate opens. At this time, the normally closed head is disengaged from the normally closed contact seat under the action of the first compression spring, thereby releasing the connection between the normally closed contact assembly and the normally closed contact seat. state, realizing rapid state switching; when it is necessary to restore the normally closed connection state, the normally closed contact assembly is pressed downward by the corresponding push switch, so that the normally closed head moves down into the normally closed contact seat, the limit rod limits the downward movement operation, and then the second electromagnet seat is closed, and the straight-moving push rod quickly recovers under the action of the third compression spring, that is, the straight-moving push rod drives the operating rod to move inward to press the corresponding movable contact plate, and the two movable contact plates of the normally closed contact seat approach each other and cooperate with the closed top plate above to position the normally closed head inside the normally closed contact seat, thereby realizing the normally closed connection state between the normally closed contact assembly and the normally closed contact seat, and realizing state switching.

[0054] The present invention is a normally closed switch state switching device for a substation. In use, under normal conditions, the normally closed head 48 is inside the normally closed contact seat 11. At this time, the switch of the present invention is in a normally closed state. When the state needs to be switched, the operating rod 9 only needs to be driven by the mechanical operating device 10 to slide outward inside the guide sleeve 8. At this time, the operating rod 9 no longer presses against the movable contact plate 101. The movable contact plate 101 rotates around the bottom pin 103 under the action of the torsion spring 104, and the upper part of the movable contact plate 101 is opened. At this time, the normally closed head 48 is separated from the normally closed contact seat 11 under the action of the first compression spring 46, and the normally closed contact is released. The connection state between the component 4 and the normally closed contact seat 11 realizes rapid state switching, and the movable groove 51 of the fixed seat 5 restricts the shaft pin 44 to move up and down and limits the moving range, thereby ensuring that the normally closed contact component 4 can move up and down smoothly and reliably, and then ensuring that the normally closed head 48 is stably and reliably disconnected from or connected to the normally closed contact seat 11, and finally realizing rapid, reliable and timely state switching action, realizing rapid and reliable circuit disconnection of the normally closed switch, thereby avoiding the expansion of faults and effectively protecting the equipment; the present invention has the advantages of simple structure, stable normally closed state, rapid, reliable and timely switching, and avoiding the expansion of faults.

Claims

1. A normally closed switch state switching device for a substation, comprising an upper plate and a lower plate, characterized in that: Normally closed contact assemblies are provided on both sides above the upper plate, fixed seats are provided on both sides below the normally closed contact assemblies, and lower limit assemblies for limiting the downward travel of the normally closed contact assemblies are provided on both sides of the upper plate corresponding to the normally closed contact assemblies; insulating shells are provided on both sides below the lower plate corresponding to the normally closed contact assemblies, and normally closed contact seats that are normally electrically connected to the normally closed contact assemblies are provided inside the insulating shells; guide sleeves are provided on the outside of the insulating shells, and operating rods are provided inside the guide sleeves, and one end of the outer side of the operating rods is connected to a mechanical operating device, and the mechanical operating device drives the corresponding operating rod to move to achieve the state switching of the normally closed electrical connection between the normally closed contact seat and the normally closed contact assembly; The normally closed contact assembly comprises a base plate, arc-shaped portions are arranged on both sides above the base plate, movable plates are arranged below the arc-shaped portions, shaft pins are arranged inside the movable plates, and limited convex plates are arranged below the inner side of the movable plates; A first compression spring is arranged below the base plate, a normally closed rod penetrating the upper plate and the lower plate is arranged inside the first compression spring, a normally closed head is arranged at one end of the normally closed rod penetrating the lower plate and extending downward, and a through hole cooperating with the normally closed head is arranged on the lower plate; The normally closed contact seat includes a group of movable contact plates, each of which is provided with a closed top plate extending inwardly above the movable contact plates, and the lower connection parts are movably connected by a pin shaft, a torsion spring is installed outside the pin shaft, and the upper ends of the torsion spring are respectively inserted into the matching positioning grooves provided on the movable contact plates.

2. A normally closed switch state switching device for a substation as claimed in claim 1, characterized in that: The upper plate and the lower plate are connected via a plurality of connection columns, wherein the connection columns include an inner groove positioning column connected to the bottom of the upper plate and an outer convex ridge positioning column connected to the top of the lower plate.

3. A normally closed switch state switching device for a substation as claimed in claim 1, characterized in that: The fixed seat is arranged on both sides of the movable plate and is movably connected to the movable plate. A vertical movable groove for limiting the up and down movement of the axle pin is arranged in front of the fixed seat; the lower limit assembly is an "L"-shaped structure as a whole, including a limit plate located at the bottom of the upper flat plate, and a limit rod is arranged above the limit plate, which passes through the upper flat plate and is docked with the limit convex plate for limiting the position.

4. A normally closed switch state switching device for a substation as claimed in claim 1, characterized in that: The mechanical operating device is a stepping operating mechanism, which includes a base, a group of transverse linear slides are arranged at intervals on the left side in front of the base, and the transverse linear slides are connected by a stepping guide rod. A fixed plate is arranged at one end of the transverse linear slide close to the right side of the base, and a tension spring connected to the transverse linear slide close to the left side of the base is installed on the fixed plate. A long-stroke electromagnet seat is arranged on the right side in front of the base, and one end of the stepping guide rod is connected to the long-stroke electromagnet seat through a first slide rod, and the other end is connected to the operating rod.

5. A normally closed switch state switching device for a substation as claimed in claim 4, characterized in that: A longitudinal linear slide is arranged on the left side below the front of the base, a stop ratchet is arranged inside the longitudinal linear slide, the stop ratchet is connected to the longitudinal linear slide through a second compression spring, the lower end of the stop ratchet is connected to the first electromagnet seat through a corresponding third slide rod, and a plurality of positioning teeth are arranged at the corresponding stop ratchet below the stepping guide rod.

6. A normally closed switch state switching device for a substation as claimed in claim 1, characterized in that: The mechanical operating device is a straight-moving operating mechanism, which includes a frame, a second electromagnet seat is arranged at the lower part of the frame, a hinge seat is arranged in front of the second electromagnet seat, a swing arm is movably connected inside the hinge seat, and the swing arm is connected to the second electromagnet seat through a second sliding rod.

7. A normally closed switch state switching device for a substation as claimed in claim 6, characterized in that: A linear spring bearing seat is arranged above the frame, an end cover is arranged on the right side of the linear spring bearing seat, a third compression spring is arranged inside the linear spring bearing seat, a straight-moving push rod is arranged inside the third compression spring, one end of the straight-moving push rod is connected to the upper end of the swing arm, and the other end is connected to the operating rod.

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