Primary and secondary fusion complete column-mounted circuit breaker and conductive column structure thereof

Abstract

The utility model discloses a primary and secondary fusion complete column-mounted circuit breaker and a conductive column structure thereof, and relates to the technical field of column-mounted circuit breakers, the conductive column structure comprises a third conductive column and an insulating column, the insulating column comprises a first insulating column and a second insulating column connected to the lower end of the first insulating column through a spring, and the lower end of the first insulating column is provided with a guide column. A blind hole is formed in the upper end of the second insulating column, a guide sleeve is arranged at the bottom of the blind hole, and the guide column is arranged in the guide sleeve in a sliding fit mode; the runner is arranged on the side wall of the guide sleeve, an orifice at one end of the runner is positioned at the bottom of the inner side of the guide sleeve, and an orifice at the other end of the runner is positioned on the upper end surface of the guide sleeve; the one-way valve is used for controlling fluid in the flow channel, the control is that the one-way valve allows the fluid in the guide sleeve to flow out through the flow channel, the pole-mounted circuit breaker comprises the conductive pole structure, and according to the scheme, the opening time of the pole-mounted circuit breaker can be effectively shortened, and the opening response speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of pole-mounted circuit breakers, in particular to a primary-secondary integrated pole-mounted circuit breaker and a conductive pole structure thereof. Background Art

[0002] As an intelligent device, the integrated primary and secondary pole-mounted circuit breaker has the characteristics of integrated primary and secondary circuit equipment and functions. It is mainly used to realize the disconnection, control and protection of power lines, and plays an important role in the comprehensive monitoring and management of power systems. The main structure of the integrated primary and secondary pole-mounted circuit breaker includes a pole and a base. Several poles (usually three) are fixed on the base. The pole is equipped with a vacuum arc chamber. The vacuum arc chamber is equipped with a moving contact and a static contact. The base is provided with an operating mechanism to realize the opening and closing excitation. When the pole-mounted circuit breaker is opened under the action of the operating mechanism, the arc generated can be quickly extinguished due to the higher vacuum degree in the vacuum arc chamber and the magnetic field in the contact gap, so as to achieve the purpose of disconnection. The integrated primary and secondary pole-mounted circuit breaker usually also includes a voltage transformer and a current transformer, which are used to collect voltage and current signals on the line respectively. It also usually includes a transformer coil, a capacitor, etc. (usually installed in the feeder terminal unit (FTU)), which is used to draw power from the line as the power supply for the operating mechanism, related control modules, and signal acquisition modules.

[0003] In order to realize the opening or closing operation, the traditional pole-mounted circuit breaker adopts spring energy storage, specifically, the spring on the spring operating mechanism is stretched manually or electrically. When the opening and closing action is triggered by an electromagnet, the moving contact is quickly driven by the spring. In addition, the technical solution provided in the patent document with patent application number CN201510439913.8 provides a technical solution for realizing the opening and closing operation of the circuit breaker based on an opening electromagnetic coil and a closing electromagnetic coil. By eliminating the mechanical operating mechanism, the number of transmission parts can be effectively simplified. In addition, the applicant has previously proposed a technical solution with patent application number CN202520016675.9. In this solution, the technical solutions involved include: the electromagnetic coil is used as the power source of the operating mechanism, and a locking mechanism including a permanent magnet is used to maintain the position of the insulating column, and a spiral spring connected in series on the insulating column is used to ensure the contact quality of the static and contacts and provide anti-impact protection for the vacuum tube.

[0004] The key performance parameters of the integrated primary and secondary pole-mounted circuit breaker include the opening and closing time, which is used to quickly cut off the circuit in the event of a fault, protect equipment and the safety of life and property, and reduce the contact erosion rate of the moving and static contacts. At the same time, when designing the structure of the integrated primary and secondary pole-mounted circuit breaker, the mechanical impact caused by its operation needs to be considered to ensure the life of the circuit breaker. Utility Model Content

[0005] In response to the above-mentioned mechanical impact problems and the opening and closing time problems, the utility model provides a primary and secondary integrated pole-mounted circuit breaker and a conductive column structure thereof. This solution can effectively reduce the opening time of the pole-mounted circuit breaker and improve the opening response speed.

[0006] In view of the above problems, the utility model provides a primary and secondary integrated set of column-mounted circuit breakers and a conductive column structure thereof to solve the problems through the following technical points: the conductive column structure of the primary and secondary integrated set of column-mounted circuit breakers includes a third conductive column with a moving contact on its upper end, an insulating column connected to the third conductive column, the insulating column includes a first insulating column connected to the lower end of the third conductive column, and a second insulating column connected to the lower end of the first insulating column through a spring, the lower end of the first insulating column is provided with a guide column, the upper end of the second insulating column is provided with a blind hole, the bottom of the blind hole is provided with a guide sleeve, and the guide column is slidably matched in the guide sleeve;

[0007] It also includes a flow channel arranged on the side wall of the guide sleeve, wherein the opening at one end of the flow channel is located at the bottom of the inner side of the guide sleeve, and the opening at the other end of the flow channel is located on the upper end surface of the guide sleeve;

[0008] It also includes a one-way valve for achieving fluid control in the flow channel, wherein the one-way valve allows the fluid in the guide sleeve to flow out through the flow channel.

[0009] In the prior art, a primary-secondary integrated pole-mounted circuit breaker includes a base and a plurality of poles, wherein the pole includes a pole shell and a conductive column structure arranged on the inner side of the pole shell, wherein the conductive column structure includes a first conductive column, a second conductive column and a third conductive column, wherein the first conductive column and the second conductive column are both provided with a terminal block for connecting the conductive column structure in series in a power grid, wherein the first conductive column and the third conductive column are connected through a vacuum tube and a bellows, and are configured such that a static contact is provided at the lower end of the first conductive column and a moving contact is provided at the upper end of the third conductive column, wherein both the static contact and the moving contact are located in the vacuum tube, wherein the third conductive column and the second conductive column are connected through a flexible cable, wherein the conductive column structure further includes a driving rod for driving the third conductive column to move, wherein the driving rod includes an insulating column, and an operating mechanism is provided at the lower end of the driving rod (generally located in the base, and the pole shell is fixed on the base), wherein the operating mechanism is used to provide a driving force for the movement of the driving rod, and further includes a locking mechanism for maintaining the state of the driving rod. At the same time, in the prior art, the insulating column is set as a two-section structure including a first insulating column and a second insulating column, and the first insulating column and the second insulating column are connected in series through a spring. The spring is used to achieve: when the insulating column drives the third conductive column to perform the action of making the moving and static contacts contact each other, after the moving and static contacts are in contact, the third conductive column forces the spring to deform through excessive displacement, so as to support the third conductive column with the elastic force provided by the spring, thereby ensuring the contact quality and contact reliability of the moving and static contacts in the closed state. However, when this structure is used in practice, due to the characteristic of the spring generating compression deformation in the circuit breaker in the closed state, when it is necessary to open the circuit, if the second insulating column is located below the first insulating column, the action of the operating mechanism drives the second insulating column to move downward, which depends on the force transmitted by the spring. The deformation process of the spring has three stages: compression state, free state and tension state. Therefore, there is a certain lag in the spring pulling down the third conductive column, which is not conducive to the opening response speed of the circuit breaker.

[0010] Based on this problem, the present invention provides the technical solution as described above. When the present invention is used, a liquid medium is added to the blind hole. The liquid medium may be transformer oil, high-ignition-point synthetic oil, etc. The amount of the liquid medium added is such that the liquid medium can cover the guide sleeve and fill the guide sleeve center hole and the flow channel. When the first insulating column and the second insulating column move relative to each other, the liquid medium is not easily carried out by the relevant moving parts. Since the guide column is slidably fitted in the guide sleeve, that is, there is a gap between the guide column and the guide sleeve, when the guide sleeve space on the lower side of the guide column is filled with the liquid medium, when the circuit breaker on the column performs the closing action, the guide column moves downward relative to the guide sleeve. At this time, the control effect of the one-way valve on the flow channel is to allow the liquid medium in the guide sleeve to be carried out by the guide sleeve. The bottom of the sleeve is discharged through the flow channel. Since the liquid medium in the space can be smoothly squeezed out through the flow channel, the liquid medium does not affect the downward movement of the guide column in the guide sleeve. Therefore, the spring still has the same function as the spring on the existing insulating column: as an intermediate elastic structure of the insulating column, the second insulating column can provide thrust for the first insulating column. After the closing is completed, the second insulating column elastically supports the first insulating column through the spring. In addition to maintaining the contact quality of the moving and static contacts, the spring can also increase the effective stroke range of the second insulating column. When the upper end of the third conductive column collides with the lower end of the first conductive column, the split insulating column also has the characteristic of reducing the mechanical impact on the contacts and vacuum tubes. At the same time, when the present solution performs the opening action, when the second insulating column moves downward under the action of the operating mechanism, the guide sleeve moves downward synchronously with the second insulating column relative to the guide column. Since the space below the guide column in the guide sleeve is filled with liquid medium, and at this time the one-way valve prevents the liquid medium above the guide sleeve from entering the guide sleeve through the flow channel, the space below the guide column in the guide sleeve cannot obtain timely liquid medium replenishment. In this case, the non-expandability of the liquid medium will cause the liquid medium to adsorb the guide column, forcing the first insulating column and the third conductive column to move downward synchronously with the second insulating column (the mutual pulling force between the first insulating column and the second insulating column will not cause the liquid medium in the space to have obvious cavitation), so that the pole-mounted circuit breaker can quickly perform the contact opening action and reduce the opening time of the pole-mounted circuit breaker. When the circuit breaker on this column maintains the open state, the first insulating column that is pulled down still makes the spring in a compressed and deformed state, so the spring can provide a thrust for the first insulating column and the second insulating column to move away from each other. Under this thrust, the liquid medium gradually enters the inner side of the guide sleeve through the gap between the guide column and the guide sleeve (including the oil immersion groove mentioned below), and the first insulating column extends relative to the second insulating column, preparing for the next closing action.

[0011] In summary, the present invention provides a technical solution in which the function of the spring is the same as that of the spring on the existing insulating column, which can not only maintain the contact quality of the moving and static contacts, but also increase the effective stroke range of the second insulating column. When the upper end of the third conductive column collides with the lower end of the first conductive column, the mechanical impact on the contact and the vacuum tube can be reduced. At the same time, the present invention provides a technical solution based on the guide sleeve, guide column, flow channel and one-way valve, which can realize the moving contact to respond quickly to the opening action and effectively reduce the opening time of the column-mounted circuit breaker.

[0012] In a specific implementation, the guide post and the guide sleeve should be arranged to be in a mutually fitting state under any operating state of the pole-mounted circuit breaker, and the size of the fitting gap between the guide post and the guide sleeve or the size of the oil immersion groove should be adapted to the selected liquid medium (for example, the viscosity of the liquid medium at the working temperature affects its return flow speed), so that after the circuit breaker is opened, under the elastic force of the spring (which may also include the pulling force of the bellows on the third conductive post), the gap and the oil immersion groove can be used to enable the liquid medium to flow back into the guide sleeve within a set time to restore the length state of the insulating post.

[0013] As a further technical solution for the conductive column structure of the primary and secondary integrated column mounted circuit breaker:

[0014] The one-way valve is arranged on the upper end surface of the guide sleeve;

[0015] The one-way valve includes a blocking ball and an elastic diaphragm, wherein the blocking ball is used to block the orifice at the end of the flow channel, and the elastic diaphragm is fixed to the upper end surface of the guide sleeve and provides a restraining force for the blocking ball;

[0016] The elastic diaphragm and the blocking ball are configured as follows:

[0017] The lower end of the plugging ball is pushed upward by the fluid in the guide sleeve, and the elastic diaphragm is elastically deformed under the action of the plugging ball, allowing the plugging ball to move away from the flow channel. At this time, the orifice of the flow channel is in a conducting state;

[0018] When the upward thrust is insufficient to push the blocking ball away from the orifice, the blocking ball is constrained by the elastic diaphragm to block the orifice.

[0019] The above provides a specific one-way valve setting method. In this scheme, if the liquid medium in the flow channel has no upward thrust on the plugging ball or the thrust is insufficient to overcome the downward thrust of the elastic diaphragm on the plugging ball, and the liquid medium provides adsorption force for the lower end of the plugging ball, the plugging ball is in a state of blocking the flow channel, and the plugging ball blocks the orifice of the flow channel; when the guide column moves downward relative to the guide sleeve, the thrust of the liquid medium on the plugging ball forces the plugging ball to overcome the force of the elastic diaphragm and separate from the orifice, and the flow channel forms a channel for discharging the liquid medium in the guide sleeve. The one-way valve provided by this scheme has a simple structure and is easy to install.

[0020] In a specific embodiment, the elastic diaphragm is configured as a strip structure, which spans across the blocking ball, and both ends extend to the outside of a pair of opposite sides of the blocking ball. Both ends of the elastic diaphragm are fixedly connected to the upper end face of the guide sleeve (preferably by bonding and then crimping the connecting bolts of the pressure plate and the elastic diaphragm). After the fixation is completed, the elastic diaphragm is in a stretched and deformed state. In this way, the vertical component of the pulling force provided by the elastic diaphragm to the upper end of the blocking ball forces the blocking ball to be in a state of blocking the orifice. When drainage is required, the guide column and the guide sleeve need to move relative to each other so that the pressure of the liquid medium can push the blocking ball to overcome the force of the elastic diaphragm and move upward relative to the guide sleeve.

[0021] The blocking ball is a rubber ball or a spherical structure with a rubber layer wrapped outside;

[0022] The blocking ball is integrally formed on the elastic diaphragm or is bonded to the elastic diaphragm.

[0023] In the above scheme, the specific structural form of the blocking ball enables the blocking ball to effectively cut off the orifice at the upper end of the flow channel, and the connection method between the blocking ball and the elastic diaphragm is used to constrain the blocking ball on the elastic diaphragm to prevent the blocking ball from leaving the orifice position during the movement, resulting in the loss of the hydraulic adsorption effect of the second insulating column on the first insulating column.

[0024] The guide column is a columnar structure coaxial with the first insulating column, and the guide column and the first insulating column form an integral columnar part.

[0025] The above provides a part form that is easy to process and manufacture. For example, when the diameter of the guide column is smaller than the diameter of the first insulating column, the integral columnar part is a stepped shaft-shaped part with a larger upper part and a smaller lower part obtained by turning.

[0026] An internal thread is arranged on the hole wall of the blind hole, an external thread matching the internal thread is arranged on the outside of the guide sleeve, and the guide sleeve and the second insulating column form a threaded connection relationship through the internal thread and the external thread.

[0027] The above provides a specific assembly scheme of the guide sleeve on the second insulating column, that is, the guide sleeve and the second insulating column are each separate parts, and a threaded connection relationship is formed through the external thread and the internal thread. This scheme is convenient for the installation of the guide sleeve and the one-way valve: first fix the guide sleeve and the one-way valve, and then install the guide sleeve into the blind hole. The external thread and the internal thread should preferably use fine pitch threads to utilize the sealing after matching to avoid the gap between the guide sleeve and the blind hole becoming a channel for the liquid medium to be sucked into the guide sleeve. As a person skilled in the art, it should be understood that when the guide sleeve is integrally formed on the second insulating column, it is also a parallel technical solution.

[0028] The spring is a helical spring coaxial with the guide post, and the guide post passes through the central hole of the spring;

[0029] The upper end and the lower end of the spring are both provided with a connecting seat fixedly connected to the end of the spring, and the connecting seat is an annular structure;

[0030] The connecting seat at the upper end of the spring is sleeved on the outer side of the guide column, and the connecting seat is locked on the side of the guide column by bolts;

[0031] The lower end surface of the connecting seat at the lower end of the spring is in contact with the upper end surface of the guide sleeve, and the connecting seat is locked on the upper end surface of the guide sleeve by bolts.

[0032] In combination with the above features that the guide sleeve and the second insulating column are split-type designs and the two are threadedly connected, a spring installation method is provided above. When assembling the conductive column structure, a one-way valve is first installed on the guide sleeve. If the one-way valve may interfere with the connection seat at the lower end of the spring, an avoidance groove is set on the connection seat, and then the spring with the connection seats connected at both ends is fixed on the guide sleeve, and then the guide sleeve is screwed into the blind hole using the spring, and then the guide column is inserted from the upper end of the spring, and the upper end connection seat and the guide column are locked from the side of the guide column. The above scheme is not only easy to assemble, but also the connection method in which the connection seat is locked on the guide column / guide sleeve by bolts can effectively ensure the connection reliability of each part in this scheme, and the spring and the connection seat can be connected by welding.

[0033] An oil soaking groove is arranged on the inner wall of the guide sleeve and / or the outer wall of the guide post.

[0034] In the above scheme, the oil immersion groove plays the role of storing and distributing the liquid medium to reduce the friction when the guide column and the guide sleeve move relative to each other. Therefore, the oil immersion groove is not limited to the vertical arrangement. Figure 2 Different from the provided method, the oil immersion groove can be an annular groove arranged on the guide sleeve / guide column.

[0035] A plurality of oil soaking grooves are arranged on the inner wall of the guide sleeve, and the oil soaking grooves are evenly distributed in an annular pattern relative to the axis of the guide sleeve;

[0036] Each oil immersion groove has an upper end intersecting with the upper end of the guide sleeve, and a lower end intersecting with the lower end of the guide sleeve.

[0037] The above scheme provides a specific way of setting up the oil immersion groove, in which the oil immersion groove can not only play the role of storing and distributing the liquid medium, but also serve as a channel for the liquid medium to enter the guide sleeve from the upper part of the guide sleeve, so that the guide sleeve has a stable liquid inlet capacity; the number and distribution method of the oil immersion grooves are used to achieve: after the liquid medium is distributed through the oil immersion grooves, uniform lubrication and wear reduction are provided at various positions in the axial direction and circumferential direction of the guide sleeve or guide column.

[0038] It also includes a first conductive column carrying a static contact and connected to a third conductive column through a vacuum tube and a bellows, and a second conductive column electrically connected to the third conductive column through a flexible cable;

[0039] The bellows is an elastic tube. When the static contact and the moving contact are in contact, the bellows is in a compressed elastic deformation state.

[0040] In this solution, the first conductive column and the second conductive column respectively provide a terminal block to connect the conductive column structure in series in the power grid, and the first conductive column provides a static contact located in the vacuum tube. The purpose of setting the bellows as an elastic tube is to achieve: since the upper end of the bellows is fixed on the vacuum tube and the lower end is fixed on the third conductive column, when the third conductive column moves upward and the static contact contacts the moving contact, the bellows in a compressed elastic deformation state has elastic storage force. When the opening action is performed, the rebound of the bellows provides part of the driving force for the opening action, so as to further improve the opening response speed of the circuit breaker on this column.

[0041] The present invention also relates to a primary and secondary integrated pole-mounted circuit breaker, comprising a pole, wherein the pole comprises a pole housing and a conductive column structure arranged in the pole housing, wherein the conductive column structure is a conductive column structure as described in any one of the above. The primary and secondary integrated pole-mounted circuit breaker is a pole-mounted circuit breaker including the above conductive column structure.

[0042] The utility model has the following beneficial effects:

[0043] The present invention provides a technical solution in which the spring has the same function as the spring on the existing insulating column, which can not only maintain the contact quality of the moving and static contacts, but also increase the effective stroke range of the second insulating column. When the upper end of the third conductive column collides with the lower end of the first conductive column, the mechanical impact on the contact and the vacuum tube can be reduced. At the same time, the present invention provides a technical solution based on the guide sleeve, guide column, flow channel and one-way valve, which can realize the moving contact to respond quickly to the opening action and effectively reduce the opening time of the column-mounted circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of a specific application embodiment of the conductive column structure of the primary and secondary integrated column mounted circuit breaker described in this scheme, and the schematic diagram is a cross-sectional view of the pole;

[0045] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0046] The reference numerals in the accompanying drawings are respectively: 1, pole shell, 2, first conductive column, 3, vacuum tube, 4, bellows, 5, second conductive column, 6, first insulating column, 61, guide column, 7, spring, 8, second insulating column, 81, blind hole, 82, one-way valve, 83, flow channel, 84, guide sleeve, 85, oil immersion groove, 9, third conductive column. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the embodiments, but the present invention is not limited to the following embodiments:

[0048] Embodiment 1:

[0049] like Figure 1 and Figure 2 As shown, the conductive column structure of the circuit breaker on the column with primary and secondary fusion sets includes a third conductive column 9 with a moving contact on its upper end, an insulating column connected to the third conductive column 9, the insulating column includes a first insulating column 6 connected to the lower end of the third conductive column 9, and a second insulating column 8 connected to the lower end of the first insulating column 6 through a spring 7. The lower end of the first insulating column 6 is provided with a guide column 61, and the upper end of the second insulating column 8 is provided with a blind hole 81. A guide sleeve 84 is provided on the bottom of the blind hole 81, and the guide column 61 is slidably fitted in the guide sleeve 84;

[0050] It also includes a flow channel 83 disposed on the side wall of the guide sleeve 84, wherein the opening at one end of the flow channel 83 is located at the bottom of the inner side of the guide sleeve 84, and the opening at the other end of the flow channel 83 is located on the upper end surface of the guide sleeve 84;

[0051] It also includes a one-way valve 82 for achieving fluid control in the flow channel 83 , wherein the one-way valve 82 allows the fluid in the guide sleeve 84 to flow out through the flow channel 83 .

[0052] In the prior art, a primary-secondary integrated pole-mounted circuit breaker includes a base and a plurality of poles, wherein the pole includes a pole housing 1 and a conductive column structure arranged inside the pole housing 1, wherein the conductive column structure includes a first conductive column 2, a second conductive column 5 and a third conductive column 9, wherein the first conductive column 2 and the second conductive column 5 are both provided with a terminal block for connecting the conductive column structure in series in a power grid, wherein the first conductive column 2 and the third conductive column 9 are connected through a vacuum tube 3 and a bellows 4, and are configured such that a static contact is provided at the lower end of the first conductive column 2 and a moving contact is provided at the upper end of the third conductive column 9, wherein both the static contact and the moving contact are located in the vacuum tube 3, wherein the third conductive column 9 and the second conductive column 5 are connected through a flexible cable, and wherein the conductive column structure further includes a driving rod for driving the third conductive column 9 to move, wherein the driving rod includes an insulating column, and an operating mechanism is provided at the lower end of the driving rod (generally located in the base, and the pole housing 1 is fixed on the base), wherein the operating mechanism is used to provide a driving force for the movement of the driving rod, and further includes a locking mechanism for maintaining the state of the driving rod. At the same time, in the prior art, the insulating column is set as a two-stage structure including a first insulating column 6 and a second insulating column 8, and the first insulating column 6 and the second insulating column 8 are connected in series through a spring 7. The spring 7 is used to achieve: when the insulating column drives the third conductive column 9 to perform the action of making the moving and static contacts contact each other, after the moving and static contacts are in contact, the third conductive column 9 forces the spring 7 to deform through excessive displacement, so as to support the third conductive column 9 with the elastic force provided by the spring 7, so as to ensure the contact quality and contact reliability of the moving and static contacts in the closed state. However, when this structure is used in practice, due to the characteristic of the spring 7 producing compression deformation in the circuit breaker in the closed state, when it is necessary to open the circuit, if the second insulating column 8 is located below the first insulating column 6, the action of the operating mechanism drives the second insulating column 8 to move downward, which depends on the force transmitted by the spring 7. The deformation process of the spring 7 has three stages: compression state, free state and tension state. Therefore, there is a certain lag in the spring 7 pulling down the third conductive column 9, which is not conducive to the opening response speed of the circuit breaker.

[0053] Based on this problem, the present invention provides the technical solution as described above. When the present invention is used, a liquid medium is added to the blind hole 81. The liquid medium may be transformer oil, high-ignition-point synthetic oil, etc. The amount of the liquid medium added is such that the liquid medium can cover the guide sleeve 84 and fill the center hole of the guide sleeve 84 and the flow channel 83. When the first insulating column 6 and the second insulating column 8 move relative to each other, the liquid medium is not easily carried out by the relevant moving parts. Since the guide column 61 is slidably fitted in the guide sleeve 84, that is, there is a gap between the guide column 61 and the guide sleeve 84, when the space of the guide sleeve 84 on the lower side of the guide column 61 is filled with the liquid medium, when the circuit breaker on the column performs the closing action, the guide column 61 moves downward relative to the guide sleeve 84. At this time, the control effect of the one-way valve 82 on the flow channel 83 is to allow the liquid in the guide sleeve 84 to flow out. The liquid medium is discharged from the bottom of the guide sleeve 84 through the flow channel 83. Since the liquid medium in the space can be smoothly squeezed out through the flow channel 83, the liquid medium does not affect the downward movement of the guide column 61 in the guide sleeve 84. Therefore, the spring 7 still has the same function as the spring 7 on the existing insulating column: as the intermediate elastic structure of the insulating column, the second insulating column 8 can provide thrust for the first insulating column 6. After the closing is completed, the second insulating column 8 elastically supports the first insulating column 6 through the spring 7. In addition to maintaining the contact quality of the moving and static contacts, the spring 7 can also increase the effective stroke range of the second insulating column 8. When the upper end of the third conductive column 9 collides with the lower end of the first conductive column 2, the split insulating column also has the characteristic of reducing the mechanical impact on the contact and the vacuum tube 3. At the same time, when the present solution performs the opening action, when the second insulating column 8 moves downward under the action of the operating mechanism, the guide sleeve 84 moves downward synchronously with the second insulating column 8 relative to the guide column 61. Since the space below the guide column 61 in the guide sleeve 84 is filled with the liquid medium, and at this time the one-way valve 82 prevents the liquid medium above the guide sleeve 84 from entering the guide sleeve 84 through the flow channel 83, the space below the guide column 61 in the guide sleeve 84 cannot obtain timely liquid medium replenishment. In this case, the non-expandability of the liquid medium will cause the liquid medium to adsorb the guide column 61, forcing the first insulating column 6 and the third conductive column 9 to move downward synchronously with the second insulating column 8 (the mutual pulling force between the first insulating column 6 and the second insulating column 8 will not cause the liquid medium in the space to have obvious cavitation), so that the pole-mounted circuit breaker can quickly perform the contact opening action, thereby reducing the opening time of the pole-mounted circuit breaker. When the circuit breaker on this column maintains the open state, the first insulating column 6 after being pulled down still makes the spring 7 in a compressed and deformed state, so the spring 7 can provide a thrust for the current first insulating column 6 and the second insulating column 8 to move the two apart. Under this thrust, the liquid medium gradually enters the inner side of the guide sleeve 84 through the gap between the guide column 61 and the guide sleeve 84 (including the oil immersion groove 85 mentioned below), and the first insulating column 6 extends relative to the second insulating column 8, preparing for the next closing action.

[0054] In summary, the present solution provides a technical solution in which the function of the spring 7 is the same as that of the spring 7 on the existing insulating column, which can not only maintain the contact quality of the moving and static contacts, but also increase the effective stroke range of the second insulating column 8. When the upper end of the third conductive column 9 collides with the lower end of the first conductive column 2, the mechanical impact on the contact and the vacuum tube 3 can be reduced; at the same time, the present solution provides a technical solution based on the guide sleeve 84, the guide column 61, the flow channel 83 and the one-way valve 82, which can realize the moving contact to respond quickly to the opening action and effectively reduce the opening time of the column-mounted circuit breaker.

[0055] In a specific implementation, the guide column 61 and the guide sleeve 84 are preferably arranged to be in a mutually fitting state under any operating state of the pole-mounted circuit breaker, and the size of the fitting gap between the guide column 61 and the guide sleeve 84 or the size of the oil-immersed groove 85 is preferably adapted to the selected liquid medium (for example, the viscosity of the liquid medium at the working temperature affects its reflux speed), so that after the circuit breaker is opened, under the elastic force of the spring 7 (which may also include the pulling force of the bellows 4 on the third conductive column 9), the gap and the oil-immersed groove 85 can be used to enable the liquid medium to flow back into the guide sleeve 84 within a set time to restore the length state of the insulating column.

[0056] Embodiment 2:

[0057] This embodiment is further refined on the basis of embodiment 1:

[0058] The one-way valve 82 is arranged on the upper end surface of the guide sleeve 84;

[0059] The one-way valve 82 includes a blocking ball and an elastic diaphragm. The blocking ball is used to block the opening of the end of the flow channel 83. The elastic diaphragm is fixed to the upper end surface of the guide sleeve 84 and provides a restraining force for the blocking ball.

[0060] The elastic diaphragm and the blocking ball are configured as follows:

[0061] The lower end of the blocking ball is pushed upward by the fluid in the guide sleeve 84, and the elastic diaphragm is elastically deformed under the action of the blocking ball, allowing the blocking ball to move away from the flow channel 83. At this time, the orifice of the flow channel 83 is in a conducting state.

[0062] When the upward thrust is insufficient to push the blocking ball away from the orifice, the blocking ball is constrained by the elastic diaphragm to block the orifice.

[0063] The above provides a specific setting method of the one-way valve 82. In this scheme, if the liquid medium in the flow channel 83 has no upward thrust on the plugging ball or the thrust is insufficient to overcome the downward thrust of the elastic diaphragm on the plugging ball, and the liquid medium provides adsorption force for the lower end of the plugging ball, the plugging ball is in a state of blocking the flow channel 83, and the plugging ball blocks the orifice of the flow channel 83; when the guide column 61 moves downward relative to the guide sleeve 84, the thrust of the liquid medium on the plugging ball forces the plugging ball to overcome the force of the elastic diaphragm and separate from the orifice, and the flow channel 83 forms a channel for discharging the liquid medium in the guide sleeve 84. The one-way valve 82 provided by this scheme has a simple structure and is easy to install.

[0064] In a specific embodiment, the elastic diaphragm is configured as a strip structure, which spans across the blocking ball, and both ends extend to the outside of a pair of opposite sides of the blocking ball. Both ends of the elastic diaphragm are fixedly connected to the upper end face of the guide sleeve 84 (preferably by means of crimping connection with connecting bolts of the pressing plate and the elastic diaphragm after bonding). After the fixation is completed, the elastic diaphragm is in a stretched and deformed state. In this way, the vertical component of the pulling force provided by the elastic diaphragm to the upper end of the blocking ball forces the blocking ball to be in a state of blocking the orifice. When drainage is required, the guide column 61 and the guide sleeve 84 need to move relative to each other so that the pressure of the liquid medium can push the blocking ball to overcome the force of the elastic diaphragm and move upward relative to the guide sleeve 84.

[0065] Embodiment 3:

[0066] This embodiment is further refined on the basis of Embodiment 2:

[0067] The blocking ball is a rubber ball or a spherical structure with a rubber layer wrapped outside;

[0068] The blocking ball is integrally formed on the elastic diaphragm or is bonded to the elastic diaphragm.

[0069] In the above scheme, the specific structural form of the blocking ball enables the blocking ball to effectively cut off the orifice at the upper end of the flow channel 83, and the connection method between the blocking ball and the elastic diaphragm is used to constrain the blocking ball on the elastic diaphragm to prevent the blocking ball from leaving the orifice position during the movement, resulting in the loss of the hydraulic adsorption effect of the second insulating column 8 on the first insulating column 6.

[0070] Embodiment 4:

[0071] This embodiment is further refined on the basis of embodiment 1:

[0072] The guide column 61 is a columnar structure coaxial with the first insulating column 6 , and the guide column 61 and the first insulating column 6 form an integral columnar part.

[0073] The above provides a part form that is easy to process and manufacture. For example, the diameter of the guide column 61 is smaller than the diameter of the first insulating column 6. The integral columnar part is a stepped shaft-shaped part with a larger upper part and a smaller lower part obtained by turning.

[0074] Embodiment 5:

[0075] This embodiment is further refined on the basis of embodiment 1:

[0076] The blind hole 81 has an internal thread on its wall, the guide sleeve 84 has an external thread matching the internal thread on its exterior, and the guide sleeve 84 and the second insulating column 8 form a threaded connection relationship via the internal thread and the external thread.

[0077] The above provides a specific assembly scheme of the guide sleeve 84 on the second insulating column 8, that is, the guide sleeve 84 and the second insulating column 8 are each separate parts, and a threaded connection relationship is formed through the external thread and the internal thread. The scheme is convenient for the installation of the guide sleeve 84 and the one-way valve 82: first fix the guide sleeve 84 and the one-way valve 82, and then install the guide sleeve 84 into the blind hole 81. The external thread and the internal thread are preferably fine-pitch threads to utilize the sealing performance after matching, so as to avoid the gap between the guide sleeve 84 and the blind hole 81 from becoming a channel for the liquid medium to be sucked into the guide sleeve 84. As a person skilled in the art, it should be understood that when the guide sleeve 84 is integrally formed on the second insulating column 8, it is also a parallel technical solution.

[0078] Embodiment 6:

[0079] This embodiment is further refined on the basis of Embodiment 5:

[0080] The spring 7 is a helical spring coaxial with the guide post 61, and the guide post 61 passes through the center hole of the spring 7;

[0081] The upper end and the lower end of the spring 7 are both provided with connection seats fixedly connected to the ends of the spring 7, and the connection seats are both annular structures;

[0082] The connecting seat at the upper end of the spring 7 is sleeved on the outer side of the guide column 61, and the connecting seat is locked on the side of the guide column 61 by bolts;

[0083] The lower end surface of the connecting seat at the lower end of the spring 7 is in contact with the upper end surface of the guide sleeve 84, and the connecting seat is locked on the upper end surface of the guide sleeve 84 by bolts.

[0084] In combination with the above features that the guide sleeve 84 and the second insulating column 8 are split-type designs and the two are threadedly connected, a method for installing the spring 7 is provided above. When assembling the conductive column structure, the one-way valve 82 is first installed on the guide sleeve 84. If the one-way valve 82 may interfere with the connection seat at the lower end of the spring 7, an avoidance groove is set on the connection seat, and then the spring 7 with the connection seats connected at both ends is fixed on the guide sleeve 84, and then the guide sleeve 84 is screwed into the blind hole 81 using the spring 7, and then the guide column 61 is inserted from the upper end of the spring 7, and the upper end connection seat and the guide column 61 are locked from the side of the guide column 61. The above scheme is not only convenient for assembly, but also the connection method in which the connection seat is locked on the guide column 61 / guide sleeve 84 by bolts can effectively ensure the connection reliability of each part in this scheme, and the spring 7 and the connection seat can be connected by welding.

[0085] Embodiment 7:

[0086] This embodiment is further refined on the basis of embodiment 1:

[0087] An oil soaking groove 85 is provided on the inner wall of the guide sleeve 84 and / or the outer wall of the guide post 61 .

[0088] In the above scheme, the oil immersion groove 85 plays the role of storing and distributing the liquid medium to reduce the friction when the guide column 61 and the guide sleeve 84 move relative to each other. Therefore, the oil immersion groove 85 is not limited to the vertical arrangement. Figure 2 Different from the provided method, the oil immersion groove 85 can be an annular groove provided on the guide sleeve 84 / guide column 61.

[0089] Embodiment 8:

[0090] This embodiment is further refined on the basis of Embodiment 7:

[0091] The inner wall of the guide sleeve 84 is provided with a plurality of oil soaking grooves 85, and the oil soaking grooves 85 are evenly distributed in an annular manner relative to the axis of the guide sleeve 84;

[0092] Each oil immersion groove 85 has an upper end intersecting with the upper end of the guide sleeve 84 and a lower end intersecting with the lower end of the guide sleeve 84 .

[0093] The above scheme provides a specific setting method of the oil immersion groove 85. The oil immersion groove 85 in this method can not only play the role of storing and distributing the liquid medium, but also serve as a channel for the liquid medium to enter the guide sleeve 84 from the upper part of the guide sleeve 84, so that the guide sleeve 84 has a stable liquid intake capacity; the number and distribution method of the oil immersion grooves 85 are used to achieve: after the liquid medium is distributed through the oil immersion grooves 85, uniform lubrication and wear reduction are provided at various positions in the axial direction and circumferential direction of the guide sleeve 84 or the guide column 61.

[0094] Embodiment 9:

[0095] This embodiment is further refined on the basis of embodiment 1:

[0096] It also includes a first conductive column 2 carrying a static contact and connected to a third conductive column 9 through a vacuum tube 3 and a bellows 4, and a second conductive column 5 electrically connected to the third conductive column 9 through a flexible cable;

[0097] The bellows 4 is an elastic tube. When the static contact and the moving contact are in contact, the bellows 4 is in a compressed elastic deformation state.

[0098] In this solution, the first conductive column 2 and the second conductive column 5 provide a terminal block respectively, so as to connect the conductive column structure in series in the power grid, and the first conductive column 2 provides a static contact located in the vacuum tube 3. The bellows 4 is set as an elastic tube to achieve: since the upper end of the bellows 4 is fixed on the vacuum tube 3, and the lower end is fixed on the third conductive column 9, when the third conductive column 9 moves upward and the static contact contacts the moving contact, the bellows 4 in the compressed elastic deformation state has elastic storage force, and when the opening action is performed, the rebound of the bellows 4 provides part of the driving force for the opening action, so as to further improve the opening response speed of the circuit breaker on the column.

[0099] Embodiment 10:

[0100] Based on Example 1, this embodiment provides a primary-secondary integrated pole-mounted circuit breaker, including a pole, wherein the pole includes a pole housing 1 and a conductive column structure disposed in the pole housing 1, and the conductive column structure is the conductive column structure described in Example 1. This primary-secondary integrated pole-mounted circuit breaker is a pole-mounted circuit breaker including the above conductive column structure.

[0101] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, other embodiments derived without departing from the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A conductive column structure of a primary and secondary integrated column-mounted circuit breaker, comprising a third conductive column (9) having a movable contact on its upper end, and an insulating column connected to the third conductive column (9), wherein the insulating column comprises a first insulating column (6) connected to the lower end of the third conductive column (9), and a second insulating column (8) connected to the lower end of the first insulating column (6) via a spring (7), characterized in that: A guide column (61) is provided at the lower end of the first insulating column (6), a blind hole (81) is provided at the upper end of the second insulating column (8), a guide sleeve (84) is provided at the bottom of the blind hole (81), and the guide column (61) is slidably fitted in the guide sleeve (84); It also includes a flow channel (83) arranged on the side wall of the guide sleeve (84), wherein an opening at one end of the flow channel (83) is located at the bottom of the inner side of the guide sleeve (84), and an opening at the other end of the flow channel (83) is located on the upper end surface of the guide sleeve (84); It also includes a one-way valve (82) for achieving fluid control in the flow channel (83), wherein the one-way valve (82) allows the fluid in the guide sleeve (84) to flow out through the flow channel (83).

2. The conductive column structure of the primary and secondary integrated column mounted circuit breaker according to claim 1 is characterized in that: The one-way valve (82) is arranged on the upper end surface of the guide sleeve (84); The one-way valve (82) comprises a blocking ball and an elastic diaphragm, wherein the blocking ball is used to block the orifice at the end of the flow channel (83), and the elastic diaphragm is fixed to the upper end surface of the guide sleeve (84) and provides a restraining force for the blocking ball; The elastic diaphragm and the blocking ball are configured as follows: The lower end of the blocking ball is pushed upward by the fluid in the guide sleeve (84), and the elastic diaphragm is elastically deformed under the action of the blocking ball, allowing the blocking ball to move in a direction away from the flow channel (83). At this time, the orifice of the flow channel (83) is in a conducting state; When the upward thrust is insufficient to push the blocking ball away from the orifice, the blocking ball is constrained by the elastic diaphragm to block the orifice.

3. The conductive column structure of the primary and secondary integrated column mounted circuit breaker according to claim 2 is characterized in that: The blocking ball is a rubber ball or a spherical structure with a rubber layer wrapped outside; The blocking ball is integrally formed on the elastic diaphragm or is bonded to the elastic diaphragm.

4. The conductive column structure of the primary and secondary integrated column mounted circuit breaker according to claim 1, characterized in that: The guide column (61) is a columnar structure coaxial with the first insulating column (6), and the guide column (61) and the first insulating column (6) form an integral columnar part.

5. The conductive column structure of the primary and secondary integrated column mounted circuit breaker according to claim 1, characterized in that: An internal thread is provided on the wall of the blind hole (81), an external thread matching the internal thread is provided on the outside of the guide sleeve (84), and the guide sleeve (84) and the second insulating column (8) form a threaded connection relationship via the internal thread and the external thread.

6. The conductive column structure of the primary and secondary integrated column mounted circuit breaker according to claim 5, characterized in that: The spring (7) is a helical spring coaxial with the guide post (61), and the guide post (61) passes through the center hole of the spring (7); The upper end and the lower end of the spring (7) are both provided with connection seats fixedly connected to the ends of the spring (7), and the connection seats are both annular structures; A connecting seat at the upper end of the spring (7) is sleeved on the outer side of the guide column (61), and the connecting seat is locked on the side surface of the guide column (61) by means of bolts; The lower end surface of the connecting seat at the lower end of the spring (7) is in contact with the upper end surface of the guide sleeve (84), and the connecting seat is locked on the upper end surface of the guide sleeve (84) by means of bolts.

7. The conductive column structure of a primary and secondary integrated column mounted circuit breaker according to claim 1, characterized in that: An oil immersion groove (85) is provided on the inner wall of the guide sleeve (84) and / or the outer wall of the guide column (61).

8. The conductive column structure of the primary and secondary integrated column mounted circuit breaker according to claim 7, characterized in that: A plurality of oil soaking grooves (85) are arranged on the inner wall of the guide sleeve (84), and the oil soaking grooves (85) are evenly distributed in an annular shape relative to the axis of the guide sleeve (84); Each oil immersion groove (85) has an upper end intersecting with the upper end of the guide sleeve (84) and a lower end intersecting with the lower end of the guide sleeve (84).

9. The conductive column structure of a primary and secondary integrated column mounted circuit breaker according to any one of claims 1 to 8, characterized in that: It also includes a first conductive column (2) carrying a stationary contact and connected to a third conductive column (9) via a vacuum tube (3) and a bellows (4), and a second conductive column (5) electrically connected to the third conductive column (9) via a flexible cable; The bellows (4) is an elastic tube, and when the static contact and the moving contact are in contact, the bellows (4) is in a compressed elastic deformation state.

10. A primary and secondary integrated pole-mounted circuit breaker, comprising a pole, wherein the pole comprises a pole housing (1) and a conductive column structure arranged in the pole housing (1), characterized in that: The conductive column structure is the conductive column structure according to any one of claims 1 to 8.

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