Environment-friendly pole-mounted circuit breaker

Abstract

The utility model provides an environment -friendly pole circuit breaker, including main loop transmission component, solid seal pole component, incoming and outgoing line bushing, spring operating mechanism, current transformer, main loop transmission component includes: frame, transmission main shaft component, split spring, solid seal pole component includes: vacuum interrupter, insulating pull rod, incoming line side conducting rod, outgoing line side conducting rod, first epoxy resin shell, transmission main shaft component cooperates with insulating pull rod, and the force of spring operating mechanism and split spring is transmitted to insulating pull rod, and insulating pull rod pulls movable contact and completes the opening and closing operation of vacuum interrupter, and the position of adjustable nut on insulating pull rod is adjusted downward to reduce the overtravel, and the opening distance is increased, and the position of adjustable nut on insulating pull rod is adjusted upward to increase the overtravel, and the opening distance is reduced, on the basis of guaranteeing the performance of circuit breaker, the inside of box adopts ordinary normal pressure dry air insulation, and there is no environmental problem of greenhouse gas emission in the whole life cycle, and the development trend of green low carbon is satisfied.

Description

Technical Field

[0001] This invention belongs to the field of intelligent power distribution equipment technology, specifically, it relates to an environmentally friendly pole-mounted circuit breaker. Background Technology

[0002] In recent years, environmental protection and pollution control have received high attention in China, requiring the switchgear manufacturing industry to transform towards green and low-carbon development. Medium-voltage switchgear is showing a trend towards environmental protection, intelligence, standardization, and high-end development. To adapt to the development trend of the medium-voltage switchgear industry, it is now necessary to develop a new generation of environmentally friendly pole-mounted circuit breakers.

[0003] In the prior art, a pole-mounted circuit breaker with a built-in rotary disconnector includes a solid-sealed pole assembly, a disconnector assembly, a stationary contact support for the isolating blade, an outgoing bushing, an incoming bushing, a housing, a spring operating mechanism, and a transmission assembly. The spring operating mechanism is connected to both the transmission assembly and the disconnector assembly, and drives the insulating pull rod and directly drives the disconnector assembly to move in a directional manner through the transmission assembly. During the directional movement, it drives the moving contact of the vacuum interrupter and the isolating blade to move, realizing the opening and closing operations between the moving and stationary contacts of the vacuum interrupter, and between the isolating blade and the incoming conductive rod on the stationary contact support of the isolating blade. The built-in disconnector in the main circuit structure of this pole-mounted circuit breaker increases the overall width, and the adjustment of the opening distance and overtravel requires disassembling the parts that cooperate with the insulating pull rod. Furthermore, the incoming and outgoing bushings of the circuit breaker generally lack shielding (not considering partial discharge requirements) or have only a single shielding. The traditional ZW20 pole-mounted circuit breaker on the market is based on SF6 gas insulation, which emits greenhouse gases during operation. This goes against the green and environmentally friendly development direction of power equipment. Therefore, it is imperative to develop an environmentally friendly pole-mounted circuit breaker. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an environmentally friendly pole-mounted circuit breaker.

[0005] The present invention adopts the following technical solution.

[0006] This invention proposes an environmentally friendly pole-mounted circuit breaker, comprising: a housing, a main circuit transmission assembly, a solid-sealed pole assembly, incoming and outgoing bushings, a spring operating mechanism, and a current transformer, wherein the housing includes a main circuit enclosure and a mechanism cover.

[0007] The main circuit drive assembly includes: a frame, a drive spindle assembly, and a trip spring; wherein, the frame is installed inside the main circuit housing and is used to install the solid-sealed pole assembly; the drive spindle assembly is mounted on the frame; one end of the trip spring is fixed to the main circuit housing, and the other end cooperates with the drive spindle assembly.

[0008] The solid-sealed pole assembly includes: a vacuum interrupter, an insulating pull rod, an inlet-side conductive rod, an outlet-side conductive rod, and a first epoxy resin shell. The vacuum interrupter is integrated within the solid-sealed pole assembly and is installed using a three-phase modular design. The vacuum interrupter is cast and sealed within the first epoxy resin shell. A moving contact and a stationary contact are located inside the vacuum interrupter. The moving contact extends from the top of the vacuum interrupter, and the stationary contact extends from the bottom. The inlet-side conductive rod is fixedly connected to the stationary contact by bolts, and the outlet-side conductive rod is fixedly connected to the moving contact by bolts. The lower end of the insulating pull rod is fixedly connected to the moving contact of the vacuum interrupter, and the upper end of the insulating pull rod is connected to the drive shaft assembly via an adjustable nut.

[0009] The transmission spindle assembly works in conjunction with the insulating tie rod to transmit the force of the spring operating mechanism and the opening spring to the insulating tie rod. The insulating tie rod pulls the moving contact to complete the opening and closing operation of the vacuum interrupter. The overtravel is reduced and the opening distance is increased by adjusting the position of the adjustable nut on the insulating tie rod downward, and the overtravel is increased and the opening distance is decreased by adjusting the position of the adjustable nut on the insulating tie rod upward.

[0010] The inlet and outlet bushings include: a conductive core, a second epoxy resin outer shell, a silicone rubber outer jacket, a high-voltage shielding mesh, a low-voltage shielding mesh, and a low-voltage shielding mesh insert; the second epoxy resin outer shell is used to cast and encapsulate the conductive core, the high-voltage shielding mesh, the low-voltage shielding mesh, and the low-voltage shielding mesh insert; wherein...

[0011] Both the high-voltage and low-voltage shielding meshes are mesh structures that are uniformly wrapped around the conductive core. The high-voltage shielding mesh is equipotentially connected to the conductive core to uniformize the internal electric field. The low-voltage shielding mesh is grounded through a low-voltage shielding mesh insert to shield the electric field distortion of irregular bodies such as air gaps and sharp points, thus meeting the partial discharge requirements under air dielectric insulation.

[0012] The end of the conductive core near the solid-sealed terminal assembly is set as a cup-shaped structure, which is used to connect with the inlet-side conductive rod or the outlet-side conductive rod in the solid-sealed terminal assembly.

[0013] The inlet and outlet bushings include: a silicone rubber outer sheath; the outer contour of the silicone rubber outer sheath has an umbrella-shaped structure.

[0014] The main circuit box is a cube welded from stainless steel plates. The left and right sides of the main circuit box have pre-drilled mounting holes for inlet and outlet bushings. The mechanism cover is bolted to the front side of the main circuit box. The spring operating mechanism is arranged inside the mechanism cover.

[0015] A sealing cover is installed on top of the main circuit box. After all the components inside the main circuit box are installed, the sealing cover seals the main circuit box.

[0016] The current transformer is assembled in the part of the incoming and outgoing line bushing located inside the main circuit box and fixed to the main circuit box.

[0017] The transmission spindle assembly includes a spline spindle, an internal spline bearing, a three-phase transmission crank arm, a trip spring crank arm, a bushing, a first pin block, and a second pin block.

[0018] The splined spindle is mounted on the frame via an internal splined bearing; the three-phase drive crank arm and the trip spring crank arm are alternately mounted on the splined spindle and their axial positions are fixed by bushings; the first pin block mounted on the three-phase drive crank arm passes through the insulating pull rod in the solid-sealed pole assembly and is locked to the insulating pull rod by an adjustable nut; the second pin block mounted on the trip spring crank arm passes through one end of the trip spring and is locked to the trip spring by a nut.

[0019] Adjustable nuts are respectively assembled on both sides of the first pin block in the transmission spindle assembly.

[0020] The spring operating mechanism works in conjunction with the splined spindle in the transmission spindle assembly to transmit the opening and closing actions to the main circuit transmission assembly.

[0021] The upper end of the insulating tie rod passes through the first pin block mounted on the three-phase drive crank arm in the drive spindle assembly.

[0022] The first epoxy resin shell encapsulates the vacuum interrupter chamber and partially encapsulates the inlet-side conductive rod and the outlet-side conductive rod.

[0023] The beneficial effects of this invention are that, compared with the prior art, the pole-mounted circuit breaker of this invention has a simple structure, high modular integration, and is stable and reliable. Moreover, the internal air of the box is ordinary pressure dry air, and there are basically no environmental problems caused by greenhouse gas emissions throughout the entire life cycle, which can meet the green and low-carbon development trend.

[0024] The beneficial effects of the present invention also include:

[0025] 1. In this invention, by adjusting the adjustable nut of the connecting transmission main shaft assembly and the insulating tie rod, the opening distance and overtravel of the circuit breaker can be quickly adjusted, which improves the efficiency of circuit breaker assembly and debugging and reduces the maintenance and use costs of the circuit breaker.

[0026] 2. The high-voltage shielding mesh and low-voltage shielding mesh built into the incoming and outgoing bushings in this invention reduce the local electric field strength of the circuit breaker and reduce the size of the circuit breaker housing, so that even small-sized circuit breakers can have good working performance and effectively reduce the manufacturing cost of the product.

[0027] 3. This invention integrates the vacuum interrupter into the solid-sealed pole, with a three-phase integrated modular design and installation, and a highly integrated independent spring operating mechanism. Compared with the traditional three-phase distributed assembly, it can effectively reduce the time required for mass production and greatly improve the assembly efficiency and pass rate of the product.

[0028] 4. While ensuring all the performance of the circuit breaker, the internal enclosure uses ordinary normal-pressure dry air instead of SF6 gas, so there are basically no environmental problems caused by greenhouse gas emissions throughout the entire life cycle, which meets the development trend of green and low carbon. Attached Figure Description

[0029] Figure 1 This is a general structural diagram of an environmentally friendly pole-mounted circuit breaker proposed in this invention;

[0030] Figure 2 This is a diagram of the main circuit structure of an environmentally friendly pole-mounted circuit breaker proposed in this invention.

[0031] Figure 3 This is a structural diagram of the housing of an environmentally friendly pole-mounted circuit breaker proposed in this invention;

[0032] Figure 4 This is a structural diagram of the main circuit drive assembly of an environmentally friendly pole-mounted circuit breaker proposed in this invention;

[0033] Figure 5 This is a structural diagram of the drive shaft assembly of an environmentally friendly pole-mounted circuit breaker proposed in this invention;

[0034] Figure 6 This is a structural diagram of the solid-sealed pole assembly of an environmentally friendly pole-mounted circuit breaker proposed in this invention;

[0035] Figure 7 This is a structural diagram of the incoming and outgoing bushings of an environmentally friendly pole-mounted circuit breaker proposed in this invention;

[0036] Figures 1 to 7 The annotations in the attached figures are explained as follows:

[0037] 1-Housing, 2-Main circuit transmission assembly, 3-Solid-sealed pole assembly, 4-Inlet / outlet bushing, 5-Spring operating mechanism, 6-Current transformer;

[0038] 11-Main circuit enclosure, 12-Mechanism cover, 111-Sealing cover;

[0039] 21-Frame, 22-Transmission main shaft assembly, 23-Break spring; 221-Splined main shaft, 222-Internal splined bearing, 223-Three-phase transmission crank arm, 224-Break spring crank arm, 225-Shaft sleeve, 226-First pin block; 227-Second pin block;

[0040] 31-Vacuum interrupter chamber, 32-Insulating pull rod, 33-Inlet side conductive rod, 34-Outlet side conductive rod, 35-First epoxy resin shell, 311-Moving contact, 312-Stationary contact, 321-Adjustable nut;

[0041] 41-Conductive core, 42-Second epoxy resin outer shell, 43-Silicone rubber jacket, 44-High voltage shielding mesh, 45-Low voltage shielding mesh, 46-Low voltage shielding mesh insert. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0043] This invention proposes an environmentally friendly pole-mounted circuit breaker, such as... Figures 1 to 7 As shown, it includes: housing 1, main circuit transmission assembly 2, solid-sealed pole assembly 3, inlet and outlet bushings 4, spring operating mechanism 5, and current transformer 6. Housing 1 includes main circuit box 11 and mechanism cover 12.

[0044] In this embodiment, the main circuit box is a cube welded from stainless steel plates. The left and right sides of the main circuit box are reserved with mounting holes for inlet and outlet bushings. A sealing cover plate 111 is installed on the top of the main circuit box. After all the components inside the main circuit box are installed, the sealing cover plate seals the main circuit box to protect the components inside the main circuit box from the influence of the external environment, thereby achieving a good insulation effect.

[0045] The mechanism cover is bolted to the front side of the main circuit box; the spring operating mechanism is arranged inside the mechanism cover to protect it from external environmental influences that could cause the spring operating mechanism to rust and corrode, thereby affecting the normal opening and closing operation of the circuit breaker.

[0046] The main circuit transmission assembly 2 includes: a frame 21, a transmission spindle assembly 22, and a tripping spring 23; wherein, the frame is installed inside the main circuit housing and is used to install the solid-sealed pole assembly; the transmission spindle assembly is mounted on the frame; one end of the tripping spring is fixed to the main circuit housing, and the other end cooperates with the transmission spindle assembly.

[0047] The solid-sealed pole assembly 3 includes: a vacuum interrupter 31, an insulating pull rod 32, an inlet-side conductive rod 33, an outlet-side conductive rod 34, and a first epoxy resin shell 35. The vacuum interrupter is integrated within the solid-sealed pole assembly and is installed using a three-phase integrated modular design. The vacuum interrupter is cast and sealed within the first epoxy resin shell, which encapsulates the vacuum interrupter and partially encapsulates the inlet-side and outlet-side conductive rods. The vacuum interrupter contains a moving contact 311 and a stationary contact 312. The moving contact extends from the top of the vacuum interrupter, and the stationary contact extends from the bottom. The inlet-side conductive rod is fixedly connected to the stationary contact by bolts, and the outlet-side conductive rod is fixedly connected to the moving contact by bolts. The lower end of the insulating pull rod is fixedly connected to the moving contact of the vacuum interrupter, and the upper end of the insulating pull rod is connected to the drive shaft assembly via an adjustable nut 321.

[0048] The transmission spindle assembly 22 includes a spline spindle 221, an internal spline bearing 222, a three-phase transmission crank arm 223, a trip spring crank arm 224, a bushing 225, a first pin block 226, and a second pin block 227.

[0049] The splined spindle is mounted on the frame via an internal splined bearing; the three-phase drive crank arm and the trip spring crank arm are alternately mounted on the splined spindle and their axial positions are fixed by bushings; the first pin block mounted on the three-phase drive crank arm passes through the insulating pull rod in the solid-sealed pole assembly and is locked to the insulating pull rod by an adjustable nut; the second pin block mounted on the trip spring crank arm passes through one end of the trip spring and is locked to the trip spring by a nut.

[0050] Adjustable nuts are respectively assembled on both sides of the first pin block in the transmission spindle assembly.

[0051] The spring operating mechanism works in conjunction with the splined spindle in the transmission spindle assembly to transmit the opening and closing actions to the main circuit transmission assembly.

[0052] The upper end of the insulating tie rod passes through the first pin block mounted on the three-phase drive crank arm in the drive spindle assembly.

[0053] The transmission spindle assembly works in conjunction with the insulating tie rod to transmit the force of the spring operating mechanism and the opening spring to the insulating tie rod. The insulating tie rod pulls the moving contact to complete the opening and closing operation of the vacuum interrupter. The overtravel is reduced and the opening distance is increased by adjusting the position of the adjustable nut on the insulating tie rod downward, and the overtravel is increased and the opening distance is decreased by adjusting the position of the adjustable nut on the insulating tie rod upward.

[0054] The inlet / outlet sleeve 4 includes: a conductive core 41, a second epoxy resin shell 42, a silicone rubber jacket 43, a high-voltage shielding mesh 44, a low-voltage shielding mesh 45, and a low-voltage shielding mesh insert 46; the second epoxy resin shell is used to cast and wrap the conductive core, the high-voltage shielding mesh, the low-voltage shielding mesh, and the low-voltage shielding mesh insert.

[0055] Both the high-voltage and low-voltage shielding meshes are mesh structures that are uniformly wrapped around the conductive core. The high-voltage shielding mesh is equipotentially connected to the conductive core to uniformize the internal electric field. The low-voltage shielding mesh is grounded through a low-voltage shielding mesh insert to shield the electric field distortion of irregular bodies such as air gaps and sharp points, thus meeting the partial discharge requirements under air dielectric insulation.

[0056] The end of the conductive core near the solid-sealed terminal assembly is set as a cup-shaped structure, which is used to connect with the inlet-side conductive rod or the outlet-side conductive rod in the solid-sealed terminal assembly.

[0057] The inlet and outlet bushings include: a silicone rubber outer sheath; the silicone rubber outer sheath is relatively soft and has an umbrella-shaped outer contour, which is used to increase the creepage distance and buffer the inlet and outlet bushings.

[0058] The current transformer is installed in the part of the incoming and outgoing bushing located inside the main circuit box and fixed on the main circuit box. It is used to convert the large current in the AC circuit into a small current of a certain proportion for measurement and relay protection.

[0059] The beneficial effects of this invention are that, compared with the prior art, the pole-mounted circuit breaker of this invention has a simple structure, high modular integration, and is stable and reliable. Moreover, the internal air of the box is ordinary pressure dry air, and there are basically no environmental problems caused by greenhouse gas emissions throughout the entire life cycle, which can meet the green and low-carbon development trend.

[0060] The beneficial effects of the present invention also include:

[0061] 1. In this invention, by adjusting the adjustable nut of the connecting transmission main shaft assembly and the insulating tie rod, the opening distance and overtravel of the circuit breaker can be quickly adjusted, which improves the efficiency of circuit breaker assembly and debugging and reduces the maintenance and use costs of the circuit breaker.

[0062] 2. The high-voltage shielding mesh and low-voltage shielding mesh built into the incoming and outgoing bushings in this invention reduce the local electric field strength of the circuit breaker and reduce the size of the circuit breaker housing, so that even small-sized circuit breakers can have good working performance and effectively reduce the manufacturing cost of the product.

[0063] 3. This invention integrates the vacuum interrupter into the solid-sealed pole, with a three-phase integrated modular design and installation, and a highly integrated independent spring operating mechanism. Compared with the traditional three-phase distributed assembly, it can effectively reduce the time required for mass production and greatly improve the assembly efficiency and pass rate of the product.

[0064] 4. While ensuring all the performance of the circuit breaker, the internal enclosure uses ordinary normal-pressure dry air instead of SF6 gas, so there are basically no environmental problems caused by greenhouse gas emissions throughout the entire life cycle, which meets the development trend of green and low carbon.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. An environmentally friendly pole-mounted circuit breaker, comprising: The system comprises a housing, a main circuit transmission assembly, a solid-sealed pole assembly, inlet and outlet bushings, a spring operating mechanism, and a current transformer, wherein the housing includes a main circuit enclosure and a mechanism cover; characterized in that... The main circuit drive assembly includes: a frame, a drive spindle assembly, and a trip spring; wherein, the frame is installed inside the main circuit housing and is used to install the solid-sealed pole assembly; the drive spindle assembly is mounted on the frame; one end of the trip spring is fixed to the main circuit housing, and the other end cooperates with the drive spindle assembly. The solid-sealed pole assembly includes: a vacuum interrupter, an insulating pull rod, an inlet-side conductive rod, an outlet-side conductive rod, and a first epoxy resin shell. The vacuum interrupter is integrated within the solid-sealed pole assembly and is installed using a three-phase modular design. The vacuum interrupter is cast and sealed within the first epoxy resin shell. A moving contact and a stationary contact are provided inside the vacuum interrupter. The moving contact extends from the top of the vacuum interrupter, and the stationary contact extends from the bottom. The inlet-side conductive rod is fixedly connected to the stationary contact by bolts, and the outlet-side conductive rod is fixedly connected to the moving contact by bolts. The lower end of the insulating pull rod is fixedly connected to the moving contact of the vacuum interrupter, and the upper end of the insulating pull rod is connected to the drive shaft assembly via an adjustable nut. The transmission spindle assembly includes a splined spindle, an internal splined bearing, a three-phase transmission crank arm, a trip spring crank arm, a bushing, a first pin block, and a second pin block. The splined spindle is mounted on a frame via the internal splined bearing. The three-phase transmission crank arm and the trip spring crank arm are alternately mounted on the splined spindle, and their axial positions are fixed by the bushing. The first pin block mounted on the three-phase transmission crank arm passes through the insulating rod in the solid-sealed pole assembly and is locked to the insulating rod by an adjustable nut. The second pin block mounted on the trip spring crank arm passes through one end of the trip spring and is locked to the trip spring by a nut. Adjustable nuts are respectively mounted on both sides of the first pin block in the transmission spindle assembly. The transmission spindle assembly works in conjunction with the insulating tie rod to transmit the force of the spring operating mechanism and the opening spring to the insulating tie rod. The insulating tie rod pulls the moving contact to complete the opening and closing operation of the vacuum interrupter. The overtravel is reduced and the opening distance is increased by adjusting the position of the adjustable nut on the insulating tie rod downward, and the overtravel is increased and the opening distance is decreased by adjusting the position of the adjustable nut on the insulating tie rod upward.

2. The environmentally friendly pole-mounted circuit breaker according to claim 1, characterized in that, The inlet and outlet bushings include: a conductive core, a second epoxy resin outer shell, a silicone rubber outer jacket, a high-voltage shielding mesh, a low-voltage shielding mesh, and a low-voltage shielding mesh insert; the second epoxy resin outer shell is used to cast and encapsulate the conductive core, the high-voltage shielding mesh, the low-voltage shielding mesh, and the low-voltage shielding mesh insert; wherein... Both the high-voltage and low-voltage shielding meshes are mesh structures, uniformly wrapped around the conductive core. The high-voltage shielding mesh is equipotentially connected to the conductive core to uniformize the internal electric field, while the low-voltage shielding mesh is grounded through a low-voltage shielding mesh insert to shield the electric field distortion of the air gap and the tip, meeting the partial discharge requirements under air dielectric insulation.

3. The environmentally friendly pole-mounted circuit breaker according to claim 2, characterized in that, The end of the conductive core near the solid-sealed terminal assembly is configured as a cup-shaped structure, which is used to connect with the inlet-side conductive rod or the outlet-side conductive rod in the solid-sealed terminal assembly.

4. The environmentally friendly pole-mounted circuit breaker according to claim 2, characterized in that, The inlet and outlet bushings include: a silicone rubber outer sheath; the outer contour of the silicone rubber outer sheath has an umbrella-shaped structure.

5. The environmentally friendly pole-mounted circuit breaker according to claim 1, characterized in that, The main circuit box is a cube welded from stainless steel plates. The left and right sides of the main circuit box have pre-drilled mounting holes for inlet and outlet bushings. The mechanism cover is bolted to the front side of the main circuit box. The spring operating mechanism is arranged inside the mechanism cover. A sealing cover is installed on top of the main circuit box. After all the components inside the main circuit box are installed, the sealing cover seals the main circuit box.

6. The environmentally friendly pole-mounted circuit breaker according to claim 5, characterized in that, The current transformer is assembled in the part of the incoming and outgoing line bushing located inside the main circuit box and fixed to the main circuit box.

7. The environmentally friendly pole-mounted circuit breaker according to claim 1, characterized in that, The spring operating mechanism works in conjunction with the splined spindle in the transmission spindle assembly to transmit the opening and closing actions to the main circuit transmission assembly.

8. An environmentally friendly pole-mounted circuit breaker according to claim 7, characterized in that, The upper end of the insulating tie rod passes through the first pin block mounted on the three-phase drive crank arm in the drive spindle assembly.

9. An environmentally friendly pole-mounted circuit breaker according to claim 1, characterized in that, The first epoxy resin shell encapsulates the vacuum interrupter chamber and partially encapsulates the inlet-side conductive rod and the outlet-side conductive rod.

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