A double-break isolating switch

Abstract

The invention relates to a double-break isolating switch, which comprises a shell, wherein a first and a second static contact seat are relatively fixed in the shell, a moving contact seat is arranged between the first and the second static contact seats, a first and a second moving contact are guided and slidably mounted on the moving contact seat, a driving structure comprises a transmission shaft and an operating mechanism, the transmission shaft drives the first and the second moving contacts to synchronously move through the transmission structure in the shell to realize opening and closing, the transmission structure in the shell comprises a main crank arm, the transmission shaft is non-rotatably connected to the middle part of the main crank arm, two ends of the main crank arm are respectively linked with two groups of transmission components, the transmission component comprises a connecting rod, the middle part of the connecting rod is hinged to the end part of the main crank arm, one end of the connecting rod is hinged to the moving contact, a guiding structure for guiding the other end of the connecting rod is arranged in the shell, the guiding direction of the guiding structure is perpendicular to the guiding moving direction of the moving contact, the movement requirement of the moving contact can be met by rotating the main crank arm less than one circle, and the response speed of opening and closing can be improved.

Description

Technical Field

[0001] The invention belongs to the field of high-voltage AC and DC power transmission and transformation, and in particular relates to a double-break isolating switch suitable for non-stop expansion, maintenance and testing of a busbar. Background Art

[0002] With the development of the economy and society and the improvement of people's living standards, the whole society has higher and higher requirements for power supply reliability and lower tolerance for power outages. Government departments, power regulatory agencies, and media networks pay close attention to production safety, and planned power outages are becoming increasingly difficult. However, in order to reduce infrastructure and operation and maintenance costs, larger GIS power stations are generally built in phases. Most GIS power stations need to be expanded, and the first phase of GIS products only have expansion interfaces reserved, which requires busbar power outages. At the same time, when a certain interval fails during GIS operation, the interval needs to be repaired separately, which also requires busbar power outages. Expansion power outages mean delays in project construction progress, waste of manpower and material resources, and direct or indirect economic losses.

[0003] At present, the main reason why GIS cannot be expanded, repaired and tested without power outage is that in the expansion structure design, there is only one isolation break between the standby bay and the operating busbar. When the bays are connected and installed, in order to avoid sudden discharge and breakdown of the isolation break and cause personal injury, the original operating busbar needs to be powered off.

[0004] During AC withstand voltage test after bay expansion and overhaul, if the test voltage cannot maintain the same frequency and phase as the operating voltage, there will be a condition where the isolation break is subjected to reverse superposition of the test voltage and the operating voltage amplitude. In order to avoid the breakdown of the isolation break and endanger the operating equipment, DL / T 555, DL / T 617, DL / T 618 and other standards stipulate that when the GIS expansion part withstands the voltage, the original adjacent equipment should be powered off and grounded, otherwise, measures should be taken to consider the damage caused by sudden breakdown to the original part. The current measure is to shut down the original operating bus.

[0005] In order to avoid the problems caused by the need to shut down the busbar during expansion, the prior art proposes the idea of ​​expansion and maintenance without power outage. At present, there are many technical solutions for realizing expansion and maintenance without power outage, among which the expansion, maintenance and withstand voltage test solution of double-break disconnector without power outage is the current research hotspot. The existing double-break structure of disconnector, such as a double-break disconnector module disclosed in the patent document with authorization announcement number CN206331958U, includes a housing and a driving structure for driving the moving and static contacts in the housing to open and close the switch, the moving contacts and the static contacts are respectively two to form a double break, the two static contacts are respectively fixed on the pot-type insulators at the axial ends of the housing, the two moving contacts are arranged in the inner cavity on the moving contact seat, and the ends of the two moving contacts away from the static contacts are respectively provided with axially arranged racks, the driving structure includes a transmission gear, and the two moving contacts are respectively arranged on the radial sides of the transmission gear to drive the two moving contacts to move synchronously when the transmission gear rotates, so as to realize that the two breaks of the double-break disconnector are in the closed position or the open position at the same time.

[0006] However, the above-mentioned double-break disconnector adopts a gear rack transmission structure. When performing opening and closing operations, the transmission gear needs to rotate multiple times to realize the movement of the moving contact into place, and the response speed is slow, which is not conducive to the rapid opening and closing of the switch. At the same time, the parts manufacturing process of this gear rack transmission form is relatively complicated and the cost is relatively high. Summary of the invention

[0007] The object of the present invention is to provide a double-break disconnector to solve the problems of slow opening and closing response speed and high parts manufacturing cost of the current double-break disconnector.

[0008] The technical solution of the double-break disconnector of the present invention is:

[0009] A double-break disconnector, comprising a housing, wherein a first and a second static contact seat are relatively fixed in the housing, a moving contact seat is arranged between the first and the second static contact seat, and a first and a second moving contact are guided and slidably mounted on the moving contact seat. The double-break disconnector also comprises a driving structure, wherein the driving structure comprises a transmission shaft extending into the housing and an operating mechanism located outside the housing and connected to the transmission shaft in transmission, the transmission shaft is connected to the first and the second moving contacts through the transmission structure in the housing, and is used to drive the first and the second moving contacts to synchronously move to realize opening and closing. The transmission structure in the housing comprises a main crank arm, the transmission shaft is non-rotatably connected to the middle part of the main crank arm, two groups of transmission components are respectively linked at both ends of the main crank arm, and the two groups of transmission components respectively drive the first and the second moving contacts to move, and the transmission component comprises a connecting rod, the middle part of the connecting rod is hinged to the end of the main crank arm, and one end of the connecting rod is hinged to the corresponding moving contact. A guiding structure for guiding the other end of the connecting rod is also arranged in the housing, and the guiding direction of the guiding structure is perpendicular to the guiding movement direction of the moving contact.

[0010] Beneficial effect: the two ends of the main crank arm are respectively hinged with the middle parts of the two connecting rods, one end of the connecting rod is hinged with the moving contact, and the other end can slide through the guide structure, so that when the main crank arm is driven to rotate by the transmission shaft of the driving structure, the main crank arm drives the two connecting rods to move at the same time, and then the two moving contacts are driven by the connecting rod and cooperate with the guide on the moving contact seat to move in opposite directions, so that they can contact with their corresponding static contacts, so as to realize the simultaneous opening and closing of the double-break disconnector; by using a main crank arm and two connecting rods to simultaneously drive the two moving contacts to make relative movements in opposite directions, compared with the gear rack transmission form, it is not necessary to rotate the main crank arm for multiple turns, and the main crank arm can meet the movement needs of the moving contact by less than one turn, which can improve the response speed of opening and closing, and the crank arm connecting rod structure is also easier to manufacture, which is conducive to reducing costs; at the same time, by arranging a guide structure at one end of the connecting rod, when the main crank arm length and the connecting rod length are the same, the main crank arm can rotate the same angle to enable the moving contact to obtain a faster moving speed.

[0011] Furthermore, the guiding movement paths of the first and second moving contacts are parallel to each other and spaced apart in a direction perpendicular to the movement paths.

[0012] Beneficial effect: In this way, the guiding moving paths of the two moving contacts do not overlap, and there will be no interference in the movement of the two moving contacts, so that the two moving contacts can be moved to a state where the projections in the direction perpendicular to the moving path overlap, so that the moving contacts can obtain a larger moving stroke and reduce the size of the outer shell as much as possible while ensuring the opening distance.

[0013] Furthermore, the main crank arm is arched, the transmission shaft is non-rotatably connected to the middle position of the arched main crank arm, and the connecting rod is hingedly connected to the end of the arched main crank arm. In the axial projection direction of the transmission shaft, when the moving contact moves to a position overlapping with the main crank arm, part of the moving contact is located in the arch space of the arched main crank arm.

[0014] Beneficial effect: By setting the main crank arm in an arch shape, the hinge of the two connecting rods and the movement avoidance of the moving contact are met, the structure is simple and easy to manufacture, and the overall transmission structure in the shell is relatively compact, which is conducive to the compact design of the switch product.

[0015] Furthermore, the guiding paths of the guiding structures for guiding the connecting rods of the two groups of transmission assemblies are collinear.

[0016] Beneficial effect: The guiding paths of the two guiding structures are colinear, which can reduce the space occupied by arranging the two guiding structures and is conducive to compact design.

[0017] Furthermore, the guiding movement paths of the first and second moving contacts are collinear, and the guiding paths of the guiding structures for guiding the connecting rods of the two sets of transmission assemblies are collinear.

[0018] Beneficial effects: The use of this co-linear setting is conducive to the design of the overall insulation structure and to reducing costs. At the same time, the moving end structure of the entire double-break disconnector is more compactly arranged perpendicular to the guide movement direction, which is conducive to compact design of the double-break disconnector according to needs.

[0019] Furthermore, the guide structure comprises a guide slot, and a guide pin is provided on the connecting rod. The guide pin is slidably installed in the guide slot and can rotate around its own axis in the guide slot.

[0020] Beneficial effect: By arranging a guide sliding pin at the end of the connecting rod to form a guide match with the guide sliding groove, such a guide structure is relatively simple and easy to manufacture.

[0021] Furthermore, the connecting rod is in the shape of a long strip, and the guide pin is fixed on the connecting rod perpendicular to the plate surface of the connecting rod. The guide structure includes a guide column extending in the guide direction, and an axially extending cross groove is provided on the guide column. The two ends of the guide pin and the plate body of the connecting rod on both sides of the guide pin respectively extend into the four notches of the cross groove.

[0022] Beneficial effect: By setting a cross groove on the guide column, on the one hand, the movement of the long plate-shaped connecting rod can be avoided, and on the other hand, the two ends of the guide sliding pin passing through both sides of the connecting rod can be supported on the guide column respectively, so that the structure is stable and the operation is reliable.

[0023] Furthermore, the guide columns of the two guide structures are respectively connected with fixing flanges at opposite ends, and the fixing flanges are used to be fixedly connected to the moving contact seat.

[0024] Beneficial effect: The guide structure and the moving contact are integrated on the moving contact seat, which is conducive to compact design.

[0025] Furthermore, the guide column and the fixing flange are an integrally cast structure.

[0026] Beneficial effects: convenient manufacturing, reduced setting of connecting parts, and conducive to ensuring the electric field distribution of the shell.

[0027] Furthermore, the transmission shaft is an insulating transmission shaft.

[0028] Beneficial effect: the transmission shaft is directly set as an insulating shaft, which has good insulation performance and simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the connection state between the transmission structure in the housing and the transmission shaft in Embodiment 1 of the double-break disconnector of the present invention;

[0030] Figure 2 for Figure 1A top view of the operating mechanism is added;

[0031] Figure 3 It is a schematic diagram of the moving contact in the middle state in the embodiment 1 of the double-break disconnector of the present invention;

[0032] Figure 4 It is a schematic diagram of the moving contact in the open state in the embodiment 1 of the double-break disconnector of the present invention;

[0033] Figure 5 It is a schematic diagram of the moving contact in the embodiment 1 of the double-break disconnector of the present invention being in a closed state;

[0034] Figure 6 It is a schematic diagram of a moving contact in an open state in Embodiment 2 of a double-break disconnector of the present invention;

[0035] Figure 7 It is a schematic diagram of the moving contact in the closed state in the embodiment 2 of the double-break disconnector of the present invention.

[0036] In the figure: 1. transmission system; 2. first static contact; 3. second static contact; 4. first moving contact; 5. second moving contact; 10. operating mechanism; 11. second fixed flange; 12. second guide column; 13. second connecting rod; 14. transmission support; 15. transmission shaft; 16. main crank arm; 17. first connecting rod; 18. first fixed flange; 19. first guide column; 191. guide slide groove; 192. avoidance groove; 111. guide slide pin; 03. second moving contact; 04. first moving contact. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0039] It should be noted that the terms that may appear in the specific embodiments of the present invention, such as relational terms such as "first" and "second", are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms that may appear, such as "include", "comprise" or any other variants thereof, are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the possible statements "including one...", etc., do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention is further described in detail below in conjunction with embodiments.

[0043] Embodiment 1 of the double-break disconnector of the present invention:

[0044] The double-break disconnector comprises a shell, the inner cavity of which forms a sealed air chamber, two supporting insulators arranged opposite to each other are arranged on the shell, a static contact seat is arranged on the supporting insulator, the static contact seats on the two supporting insulators respectively constitute a first static contact seat and a second static contact seat, a first static contact 2 is arranged on the first static contact seat, a second static contact 3 is arranged on the second static contact seat, the first static contact 2 and the second static contact 3 are staggered, and the central axes of the first static contact 2 and the second static contact 3 arranged opposite to each other are parallel; a moving contact seat (not shown in the figure) is also arranged on the shell, and the moving contact seat is fixed in the air chamber by an insulating support, and the moving contact seat is located between the first and second Between the static contact seats, the moving contact seat is slidingly equipped with a first moving contact 4 and a second moving contact 5, the first moving contact 4 is in contact and conduction with the first static contact 2, the second moving contact 5 is in contact and conduction with the second static contact 3, the two moving contacts and the two static contacts form a double-break structure, the double-break disconnector also includes a transmission system 1 for realizing simultaneous opening and closing of the double-break structure, the transmission system 1 includes a driving structure and a transmission structure in a shell, the moving contact seat is a casting with an inner cavity, the transmission structure in the shell is in the inner cavity and can move in the inner cavity, the moving contact seat surrounds the transmission structure in the shell to ensure the uniformity of the electric field.

[0045] like Figure 1 and Figure 2 As shown, the driving structure includes an operating mechanism 10 located outside the housing and a transmission shaft 15 extending into the housing. The transmission shaft 15 is rotatably supported in the housing through a transmission support 14. The transmission shaft 15 is an insulating transmission shaft 15. The operating mechanism 10 is transmission-connected to one end of the transmission shaft 15, and the other end of the transmission shaft 15 is transmission-connected to the transmission structure in the housing. The transmission structure in the housing includes a main crank arm 16 and two sets of transmission components linked to the main crank arm 16. The transmission components include a connecting rod, which is used to drive the moving contact to move. The two transmission components are respectively a first transmission component and a second transmission component.

[0046] The main crank arm 16 is arched and is a plate-type crank arm. The transmission shaft 15 is non-rotatably connected to the middle position of the arched main crank arm 16. The connecting rod and the transmission shaft 15 are respectively located on both sides of the main crank arm 16. The transmission shaft 15 is connected to a plate surface on one side of the main crank arm 16 that faces away from the arched space. The two ends of the main crank arm 16 are respectively connected with connecting rods, one end is connected to the first connecting rod 17 of the first transmission assembly, and the other end is connected to the second connecting rod 13 of the second transmission assembly. The middle part of the first connecting rod 17 and the middle part of the second connecting rod 13 are respectively hinged to the two ends of the main crank arm 16 through pin shafts.

[0047] One end of the first connecting rod 17 close to the rotation axis of the main crank arm 16 is connected to the first moving contact 4. The first moving contact 4 is a moving contact rod structure. The first moving contact 4 has a contact end for contacting the first static contact 2 and a hinged end that is hingedly connected to the first connecting rod 17 through a pin. In the axial projection direction of the transmission shaft 15, when the moving contact moves to a position overlapping with the main crank arm 16, part of the moving contact is located in the arch space of the arched main crank arm 16. In this way, the overall transmission structure in the housing is relatively compact, which is conducive to the compact design of the switch product. A contact guide hole (not shown in the figure) is provided on the cavity wall of the moving contact seat, and the rod portion of the first moving contact 4 is inserted into the contact guide hole to achieve guided movement.

[0048] One end of the first connecting rod 17 away from the rotation axis of the main crank arm 16 is connected to the guide structure, and the guide direction of the guide structure is perpendicular to the guide movement direction of the moving contact. The guide structure includes a first fixed flange 18 and a first guide column 19 integrally formed with the first fixed flange 18. The first fixed flange 18 is fixed to the moving contact seat. The first guide column 19 is provided with an axially extending cross groove. The cross groove includes a first transverse groove penetrating the first guide column 19 along the rotation axis direction of the main crank arm 16 and a first vertical groove penetrating the guide column along the direction perpendicular to the rotation axis direction of the main crank arm 16. The transverse groove and the vertical channel have two side notches opposite to each other. The first connecting rod 17 is in the shape of a long strip, and a through hole is provided at the end of the first connecting rod 17. The guide pin 111 is fixedly installed in the through hole of the connecting rod perpendicular to the plate surface of the first connecting rod 17. The horizontal through groove of the guide column constitutes a guide slot 191, and the vertical through groove constitutes an avoidance groove 192. The first connecting rod 17 extends into the avoidance groove 192 and the two ends of the guide pin 111 extend into the guide slot 191, so that the guide pin 111 and the plate part of the connecting rod on both sides of the guide pin 111 extend into the four notches of the cross groove respectively. When the main crank arm 16 drives the first connecting rod 17 to move, the guide pin 111 on the end of the first connecting rod 17 extending into the cross groove can slide in the guide slot 191 and can rotate around its own axis in the guide slot 191, and the avoidance groove 192 on the guide column avoids the movement of the first connecting rod 17.

[0049] The connection structure between the second connecting rod 13 and the main crank arm 16, the connection structure between the second connecting rod 13 and the second moving contact 5, and the matching form of the guide structure connected to the second connecting rod 13 are the same as the matching form of the first connecting rod 17 and the main crank arm 16, the first connecting rod 17 and the first moving contact 4, and the guide structure connected to the second connecting rod 13 are all the same. The structure of the second fixed flange 11 and the second guide column 12 are the same as the structure of the first fixed flange 18 and the second guide column 12. The guiding assembly method of the second moving contact 5 on the moving contact seat is also the same as the guiding assembly method of the first moving contact 4.

[0050] like Figure 3 , Figure 4 , Figure 5 As shown, when the first moving contact 4 and the second moving contact 5 are in the middle state, the projections of the first connecting rod 17, the second connecting rod 13 and the main crank arm 16 in the direction of the rotation axis of the main crank arm 16 overlap, the first connecting rod 17 and the second connecting rod 13 are collinear, and the first connecting rod 17 is perpendicular to the first moving contact 4, and the second connecting rod 13 is perpendicular to the second moving contact 5;

[0051] When opening the switch, the operating mechanism 10 outside the shell drives the transmission shaft 15 to rotate, and the transmission shaft 15 drives the main crank arm 16 to rotate. The main crank arm 16 simultaneously drives the first connecting rod 17 and the second connecting rod 13 to move. The first connecting rod 17 drives the first moving contact 4 to move away from the first static contact 2, and the second connecting rod 13 drives the second moving contact 5 to move away from the second static contact 3. The two moving contacts move in opposite directions respectively, thereby realizing the simultaneous opening of the double-break disconnector.

[0052] The guide moving paths of the first moving contact 4 and the second moving contact 5 are parallel to each other and spaced apart in a direction perpendicular to the moving paths, so that the guide moving paths of the two moving contacts do not overlap, and there is no interference in the movement of the two moving contacts, so that the two moving contacts can be moved to a state where their projections in a direction perpendicular to the moving paths overlap, thereby allowing the moving contacts to obtain a larger moving stroke and reducing the size of the outer shell as much as possible while ensuring the opening distance.

[0053] At the same time, when the connecting rod moves, the guide pin 111 slides in the guide slot 191 to guide one end of the connecting rod to move, restricting the end of the connecting rod away from the moving contact to move in a straight line, thereby facilitating the movement speed of the end of the connecting rod hinged with the moving contact. In addition, the guiding paths of the two guiding structures guiding the two connecting rods are collinear, which is conducive to the compact design of the double-break disconnector.

[0054] When closing the switch, the operating mechanism 10 outside the housing drives the transmission shaft 15 to rotate, the transmission shaft 15 drives the main crank arm 16 to rotate, and the main crank arm 16 drives the first connecting rod 17 and the second connecting rod 13 to move at the same time, the first connecting rod 17 drives the first moving contact 4 to move in the direction close to the first static contact 2, and the second connecting rod 13 drives the second moving contact 5 to move in the direction close to the second static contact 3, and the two moving contacts move in opposite directions respectively, realizing the simultaneous closing of the double-break disconnector. Moreover, in the process from the open state to the closed state, the rotation angle of the main crank arm 16 is 80°.

[0055] In this way, by using a main crank arm and two connecting rods to simultaneously drive the two moving contacts to make relative movements in opposite directions, compared with the gear rack transmission form, there is no need to rotate the main crank arm multiple times. The main crank arm can rotate less than one circle to meet the movement needs of the moving contact, which can improve the response speed of opening and closing. Moreover, the crank arm and connecting rod structure are easier to manufacture, which is conducive to reducing costs. At the same time, by setting a guide structure at one end of the connecting rod, when the main crank arm length and the connecting rod length are the same, the main crank arm can rotate the same angle to enable the moving contact to obtain a larger moving stroke.

[0056] Embodiment 2 of the double-break disconnector in the present invention:

[0057] The difference between this embodiment and embodiment 1 is that the guide movement paths of the first moving contact and the second moving contact in embodiment 1 are parallel to each other and are spaced apart in a direction perpendicular to the movement paths. Figure 6 and Figure 7 As shown, the guide movement paths of the first moving contact 04 and the second moving contact 03 are collinear, and correspondingly, the first static contact and the second static contact are on the same axis, so that the entire moving end can be assembled in a direction perpendicular to the guide movement direction of the moving contact, whichever structure is more compact and suitable for different usage requirements.

[0058] Embodiment 3 of the double-break disconnector in the present invention:

[0059] The difference between this embodiment and embodiment 1 is that the main crank arm in embodiment 1 is arched. In this embodiment, the main crank arm is U-shaped, and the two opposite side arms of the U-shape are respectively used to be hingedly connected to the two connecting rods, or in other embodiments, the main crank arm is a straight plate structure, and the moving contact is hinged on one side of the connecting rod.

[0060] Embodiment 4 of the double-break disconnector in the present invention:

[0061] The difference between this embodiment and embodiment 1 is that the transmission assembly in embodiment 1 includes a connecting rod and a guide slide pin installed at one end of the connecting rod. In this embodiment, the transmission assembly includes a connecting rod and two screw rods threadedly connected to both sides of the connecting rod, and the screw rods are used to slide in the guide slide groove.

[0062] Embodiment 5 of the double-break disconnector in the present invention:

[0063] The difference between this embodiment and embodiment 1 is that a cross groove is provided on the guide column in embodiment 1, the guide slide pin passes through the connecting rod and has two ends exposed on both sides of the connecting rod, and the two ends of the guide slide pin and the plate body part of the connecting rod on both sides of the guide slide pin extend into the four notches of the cross groove respectively. In this embodiment, the guide column is a square column, the connecting rod is located on one side of the guide column, a guide pin is installed on the connecting rod, one end of the guide pin is provided with a limit sleeve, a guide groove is provided on the guide column, the guide pin extends into the guide groove, and the end exposed from the guide groove is limited by the limit sleeve so that the guide pin slides in the guide groove.

[0064] Embodiment 6 of the double-break disconnector in the present invention:

[0065] The difference between this embodiment and the first embodiment is that the main crank arm and the connecting rod in the first embodiment are plate-shaped, while in the present embodiment, the main crank arm and the connecting rod are both cylindrical.

[0066] Embodiment 7 of the double-break disconnector in the present invention:

[0067] The difference between this embodiment and embodiment 1 is that the guide structure in embodiment 1 is composed of a guide slide pin and a guide slide groove. In this embodiment, a cylindrical guide protrusion is integrally provided at one end of the connecting rod, the guide protrusion has a cylindrical enlarged head, a guide long groove is provided on the guide column, the guide long groove is a T-shaped groove, and the guide structure is composed of the guide long groove and the guide protrusion.

[0068] Embodiment 8 of the double-break disconnector in the present invention:

[0069] The difference between this embodiment and embodiment 1 is that the guide paths of the guide structures for guiding the connecting rods of the two transmission assemblies in embodiment 1 are collinear. In this embodiment, the guide paths of the guide structures for guiding the connecting rods of the two transmission assemblies are parallel to each other and are spaced apart in a direction perpendicular to the guide direction.

[0070] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-break disconnector, comprising a housing, wherein first and second stationary contact seats are relatively fixed in the housing, a moving contact seat is arranged between the first and second stationary contact seats, and the moving contact seat is slidably mounted with first and second moving contacts. The double-break disconnector also comprises a driving structure, wherein the driving structure comprises a transmission shaft extending into the housing and an operating mechanism located outside the housing and connected to the transmission shaft in a transmission manner, wherein the transmission shaft is connected to the first and second moving contacts in a transmission manner through the transmission structure in the housing, and is used to drive the first and second moving contacts to synchronously move to realize opening and closing. The characteristics are as follows: The transmission structure in the shell includes a main crank arm, and the transmission shaft is fixedly connected to the middle part of the main crank arm. Two ends of the main crank arm are respectively linked with two groups of transmission components, and the two groups of transmission components respectively drive the first and second moving contacts to move. The transmission component includes a connecting rod, the middle part of the connecting rod is hinged to the end of the main crank arm, and one end of the connecting rod is hinged to the corresponding moving contact. A guiding structure for guiding the other end of the connecting rod is also arranged in the shell, and the guiding direction of the guiding structure is perpendicular to the guiding movement direction of the moving contact; the guiding movement paths of the first and second moving contacts are collinear and have opposite movement directions, and the guiding paths of the guiding structure for guiding the connecting rods of the two groups of transmission components are collinear.

2. The double-break disconnector according to claim 1 is characterized in that: The guide structure comprises a guide slot, a guide pin is arranged on the connecting rod, and the guide pin is slidably installed in the guide slot and can rotate around its own axis in the guide slot.

3. The double-break disconnector according to claim 2 is characterized in that: The connecting rod is in the shape of a long strip, and the guide pin is fixedly mounted on the connecting rod perpendicular to the plate surface of the connecting rod. The guide structure includes a guide column extending in the guide direction, and an axially extending cross groove is provided on the guide column. The two ends of the guide pin and the plate body of the connecting rod on both sides of the guide pin extend into the four notches of the cross groove respectively.

4. The double-break disconnector according to claim 3 is characterized in that: The guide columns of the two guide structures are respectively connected with fixing flanges at the opposite ends, and the fixing flanges are used for being fixedly connected to the moving contact seat.

5. The double-break disconnector according to claim 4 is characterized in that: The guide column and the fixing flange are an integral casting structure.

6. The double-break disconnector according to claim 1, characterized in that: The transmission shaft is an insulating transmission shaft.

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