Safety braking device of medium-voltage large-current isolating switch

Abstract

The invention provides a safety braking device of a medium-voltage large-current isolating switch. Comprising a conductive component, a base component, a driving component and a safety brake device. One end of a manually-driven main shaft is provided with a safety brake device composed of a stop disc, a manual operating rod, a brake protector and a direct-current electromagnet, and the other end of the main shaft is provided with a rotation limiting device. Limiting devices with different drives are provided with eight auxiliary switches, and remote monitoring and operation of a master control room can be achieved. The device provided by the invention enables the isolation switch to be simple and stable in operation, and greatly improves the safety performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of design and manufacturing of power transmission equipment, and in particular relates to a medium voltage (3.6KV) and large current (5.3KA, etc.) isolating switch and safety device, which are mainly suitable for positive cabinets, negative cabinets and feeder cabinets of urban rail transit traction substations, and can be widely used in tunnel cabinets, section cabinets, distribution cabinets, contact cabinets and maintenance cabinets, and are also used in isolating switch cabinets in compartment transformers. Background Art

[0002] Most of the key electrical components in my country's existing urban rail traction power supply system are imported from abroad, including medium-voltage and high-current isolating switches.

[0003] Among them, the most popular ones are SECHRON from Switzerland and ALFA from the Czech Republic.

[0004] However, both of these isolating switches have the following problems:

[0005] 1. Because the components of each driving joint part they designed have not been heat treated, but are dry friction sliding friction pairs. In particular, the main shaft has not been heat treated to increase the hardness, and it directly cooperates with the aluminum machine base for sliding friction movement. Such sliding friction control coefficient is large, mechanical wear is large, service life is short, and there are certain safety hazards during normal use.

[0006] 2. In the manually driven isolating switch, the hand-operated structure installed at one end of the main shaft that has not been heat treated, the handle body of the fixed handle is installed at the joint of the main shaft end and the aluminum machine base as a dry friction control pair. Therefore, the operating torque requirement is large, generally 175N·M, the pull rod is 0.5 meters long, so the force is 350 Newtons, which is very strenuous.

[0007] 3. The current manually driven isolating switch has no specially designed end point positioning for the "open" or "closed" state of the conductive switch. Instead, it is positioned by using a steel cam mounted on the main shaft to collide with the aluminum base, which can easily damage the base and poses a great safety hazard. Summary of the invention

[0008] The purpose of the invention is to provide a nationally produced safety brake device for medium-voltage and high-current isolating switches with low wear, energy saving, high safety performance and good stability.

[0009] To solve the above technical problems, the present invention uses the following scheme:

[0010] The invention discloses a safety brake device with different drives for a medium-voltage and high-current isolating switch. The isolating switch comprises a conductive component, a base component, a drive component and a safety brake device.

[0011] The safety brake device comprises a manually driven crankshaft connecting rod device, which is composed of a main shaft, an intermediate swing rod connected to the main shaft, and an insulating rod hinged to the intermediate swing rod. It is characterized in that a safety brake device is arranged at one end of the main shaft and a rotation limit device is arranged at the other end.

[0012] The main drawer is rollingly connected to the machine base component through a ball bearing, the intermediate swing rod is rollingly connected to the machine base insulating rod through a ball bearing, and the other end of the insulating rod is hinged to the switch of the conductive component.

[0013] A safety brake device is arranged at one end of the manually driven main shaft, which comprises a stopper plate and a manual operating lever, a brake protector and a DC electromagnet installed on the main shaft end.

[0014] The brake protector comprises a wedge, a wedge seat, a pull rod and a cover.

[0015] The DC electromagnet comprises a winding, a yoke, a limiting rod, a guide sleeve, an armature, an armature buffer pad, a wire rack, an upper end cover, a lower end cover, a return spring, and a spring tray.

[0016] The present invention can adopt a manually driven safety brake device to operate the isolating switch: the manual drive includes an operating handle, a handle connecting a handle rod, and a handle body. The handle body is fixed on the isolating switch main shaft and is close to the stop disk of the safety stop device. The brake protector and the DC electromagnet are respectively installed on the right side of the stop disk. A triangular pull plate is installed on the upper part of the conductive switch blade of the isolating switch. When the relay on the DC electromagnet receives a control cabinet or a remote operation signal, the limit rod of the electromagnet is retracted, and the pull rod return stroke of the brake protector releases the stop disk. At this time, the operating handle makes the handle rod rotate clockwise along the main shaft to realize the "closing" of the isolating switch. When the closing bump block of the limit device at the other end of the main shaft hits the auxiliary switch, the mechanical limit device stops, and the electromagnet and the brake protector on the other side are linked to lock the stop disk and brake safely. On the contrary, the "opening" of the isolating switch is realized. The triangular pull plate can also be directly pulled by an insulating rod to make the isolating switch "open" or "closed", and the safety brake device plays a protective role synchronously. In this way, the manual isolating switch is guaranteed to be operated without load, and the triple insurance ensures the personal safety of the operator.

[0017] The benefits of the invention: The safety brake device of the invention provides strong safety performance for the operation of the isolating switch; a 19W power motor is used, which greatly saves energy; all parts are heat-treated, and ball bearings are used at each movable joint to reduce wear and improve the accuracy and stability of the isolating switch operation. These have met the needs of my country's urban rail transit traction power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the right side structure of a 3.6KV, 5300A manual DC disconnect switch according to Embodiment 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of the left side structure of a 3.6KV, 5300A manual DC isolating switch according to Embodiment 1 of the present invention;

[0020] Figure 3 This is a front view of a safety brake device assembly of a 3.6KV, 5300A manual DC disconnect switch according to Embodiment 1 of the present invention;

[0021] Figure 4 1 is a top view of a safety brake device assembly of a 3.6KV, 5300A manual DC disconnect switch according to embodiment 1 of the present invention;

[0022] Figure 5 It is a cross-sectional view of a brake protector of a safety brake device combination of a 3.6KV, 5300A manual DC disconnect switch according to embodiment 1 of the present invention;

[0023] Figure 6 1 is a cross-sectional view of a DC electromagnet of a 3.6KV, 5300A manual DC disconnect switch according to Embodiment 1 of the present invention;

[0024] Combination Figures 1 to 6 , In the figure, Ⅰ is a conductive component, Ⅱ is a base component, Ⅲ is a driving component, 1 is a main shaft, 2 is an intermediate swing arm, 3 is an insulating rod, 4 is a switch-opening bumper, 5 is a switch-closing bumper, 6 is a limiting protrusion, 7 is an umbrella-shaped groove, 8 is an auxiliary switch, 9 is a conductive knife, 10 is a conductive terminal, 1001 is a stop plate, 1002 is a brake protector, 1003 is a DC electromagnet, 1004 is a triangular pull plate, 1005 is a handle, 3001 is a cover, 4001 is a wedge seat, 5001 is a wedge, 5002 is a pull rod, 6001 is a yoke, 6002 is an upper end cover, 6003 is an armature buffer pad, 6004 is a limiting rod, 6005 is a wire rack, 6006 is a winding, 6007 is a guide sleeve, 6008 is an armature, 6009 is a lower end cover, 6010 is a return spring, and 6011 is a spring tray. DETAILED DESCRIPTION

[0025] Embodiment, adopt the safety brake device of medium voltage high current isolating switch driven manually. Take 3.6kv, 5300A single pole manual isolating switch as an example.

[0026] Combination Figure 1 and Figure 6 .

[0027] like Figure 1 , Figure 2As shown, the safety brake device of the medium voltage and high current manual disconnector is generally composed of a conductive component I, a base component II, a drive component III and a safety brake device. The crankshaft connecting rod device of the drive component III is composed of a main shaft 1, an intermediate swing rod 2 connected to the main shaft, and an insulating rod 3 hinged to the intermediate swing rod. A safety brake device is provided at one end of the main shaft 1, and a rotation limit device is provided at the other end.

[0028] The main shaft 1 is rollingly connected to the base component II through a ball bearing, and the middle swing rod 2 on the main shaft 1 is rollingly connected to the insulating rod 3 through a ball bearing. The other end of the insulating rod 3 is hinged to the conductive switch 9 of the conductive component I.

[0029] One end of the spindle 1 is provided with a safety automatic device, including a stopper plate 1001 and an operating handle 1005 mounted on the spindle end, a brake protector 1002 and a DC electromagnet 1003. The brake protector 1002 includes a wedge 5001, a wedge seat 4001, a pull rod 5002 and a cover 3001. The DC electromagnet 1003 includes a winding 6006, a yoke 6001, a limit rod 6004, a guide sleeve 6007, an armature 6008, an armature buffer pad 6003, a wire rack 6005, an upper end cover 6002, a lower end cover 6009, a return spring 6010 and a spring tray 6011.

[0030] The rotation limit device at the other end of the main shaft 1 includes eight auxiliary switches 8 and a mechanical limit device. The mechanical limit device includes a limit protrusion 6 that rotates with the main shaft 1 and an umbrella-shaped groove 7 fixed on the machine base II. The auxiliary switch 8 device includes a switch opening bump block 4 and a closing bump block 5 installed on both sides of one end of the main shaft 1 and eight auxiliary switches 8 installed on the machine base II to cooperate with the bump blocks.

[0031] The embodiment of the present invention is manually driven, including an operating handle 1005, a handle connecting rod, and a handle body. The handle body is fixed to the main shaft 1 and is close to the stop disk 1001 of the safety stop device. The brake protector 1002 and the DC electromagnet 1003 are respectively installed on the right side of the stop disk 1001. A triangular pull plate 1004 is installed on the upper part of the conductive switch 9 of the disconnector.

[0040] When the relay on the DC electromagnet 1003 receives a control cabinet or remote operation signal, the limit pull rod 6004 of the electromagnet 1003 is retracted, the pull rod 5002 of the brake protector 1002 returns, and the stop disk 1001 is released. At this time, the handle 1005 is operated to rotate the handle rod clockwise along the main shaft 1 to achieve the "closing" of the isolating switch. When the closing bumper 5 of the limit device at the other end of the main shaft 1 hits the auxiliary switch 8, the mechanical limit device stops, and the DC electromagnet 1003 and the brake protector 1002 on the other side are linked to lock the stop disk 1001 and brake safely. On the contrary, the isolating switch is "opened".

[0041] The insulated pull rod can also be used to directly pull the triangular pull plate 1004 to open or close the isolating switch, and the safety brake device can be used for protection at the same time. In this way, the manual isolating switch can be operated without load, and triple insurance can be provided to ensure the personal safety of the operator.

[0047] The design and design requirements of the safety brake device of the medium voltage and high current isolating switch of the present invention comply with the national standards (IEC60947.1-2001) and (IEC60947.3-2005), and the design standards and specifications for isolating switch products in (GB14048.3-2002), and have passed various type tests.

[0048] The description and drawings of the present invention are considered to be illustrative rather than restrictive. Based on the present invention, those skilled in the art can make some substitutions and modifications to some of the technical features according to the disclosed technical content without creative labor, which are all within the protection scope of the present invention.

Claims

1. A safety brake device for a medium voltage high current isolating switch, the isolating switch comprising a conductive component, a base component, a driving component and a safety brake device. The safety brake device comprises a manually driven crankshaft connecting rod device, the crankshaft connecting rod device comprises an intermediate swing rod connected to the main shaft and an insulating rod hinged to the intermediate swing rod, and is characterized in that: A safety brake device is arranged at one end of the main shaft, and a rotation limiting device is arranged at the other end.

2. The safety brake device of the medium voltage high current isolating switch according to claim 1 is characterized in that: The main shaft is rollingly connected to the machine base part through a ball bearing; the intermediate swing rod is rollingly connected to the insulating pull rod through a ball bearing; and the other end of the insulating rod is hinged to the switch of the conductive component.

3. The safety brake device of the medium voltage high current isolating switch according to claim 1 is characterized in that: One end of the manually driven main shaft is provided with a safety brake device, which comprises a stop plate and a manual operating lever, a stop protector and a DC electromagnet installed on the main shaft end.

4. The safety brake device of the medium voltage high current isolating switch according to claims 1 and 3 is characterized in that: The brake protector comprises a wedge, a wedge seat, a pull rod and a cover.

5. The safety brake device of the medium voltage high current isolating switch according to claims 1 and 3 is characterized in that: The DC electromagnet comprises a winding, a yoke, a limit rod, a guide sleeve, an armature, an armature buffer pad, a wire frame, an upper end cover, a lower end cover, a return spring and a spring tray.

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