Disconnector

Abstract

The invention discloses a disconnector, comprising a knife assembly having a knife and a contact group; the knife comprises an elastic pull rod and two movable contact pieces, the elastic pull rod comprises a sleeve, a moving rod, a spring, a support pin and a pin seat; the two movable rods are matched at the two ends of the sleeve, and the outer end of the movable rod is connected to the movable contact piece; the spring draws the two movable rods together; the support pin is hinged between the movable rod and the pin seat; the pin seat is connected with an extension rod, and the extension rod is connected with a guide wheel; the contact group has a first static contact piece, the knife is hinged on the first static contact piece, and has an open position, an intermediate transition position and a closed position; the first static contact piece is connected with a guide frame, and the guide frame has an upper starting section and a lower starting section that keep the guide wheel in place, and drives the movable contact piece to release the stretching section of the contact group; when the knife is turned from the open position to the closed position, the guide wheels are respectively matched with the upper starting section, the stretching section and the lower starting section. The invention can significantly improve the convenience and safety of use.

Description

Technical Field

[0001] The present invention relates to the field of electric power equipment, and in particular to an isolating switch. Background Art

[0002] A disconnect switch is an electrical switching device that isolates electrical equipment from a live power grid or switches it to a different power source.

[0003] The isolating switch mainly includes a base, multiple sets of knife assemblies arranged on the base, and a switch assembly that controls the separation and connection of the multiple sets of knife assemblies. Each set of knife assemblies includes a knife and two static contacts. The two static contacts are divided into a first static contact and a second static contact, both of which are arranged on the base. One end of the knife contacts and is hinged with the first static contact, and the other end can rotate up and down and can contact or separate with the second static contact. Therefore, the isolating switch relies on the separation or contact of the knife and the static contact to achieve the isolation and conduction of the high-voltage transmission and distribution lines.

[0004] At present, the knife switch mainly includes two parallel moving contact pieces and a spring assembly that drives the two moving contact pieces to move closer together. The spring assembly can clamp the knife switch on the stationary contact piece. The existing spring assembly has a relatively simple structure, including a pin that passes through the two moving contact pieces at the same time, a nut threaded on both ends of the pin, and two springs mounted on both ends of the pin. Each spring is set between the nut and the moving contact piece, and then the two moving contact pieces are pressed toward each other.

[0005] The knife based on the spring assembly structure generally has two operating modes when in use:

[0006] 1. Before closing the switch, the operator often needs to loosen the nut to open the two moving contacts, and then make the knife switch smoothly clamp onto the second static contact after rotating downward. Finally, the operator tightens the nut to make the knife switch elastically clamp onto the two static contacts. This operation is obviously inconvenient when used;

[0007] 2. Adjust the clamping force between the two moving contact pieces in advance, and then directly use the switch assembly to pull the knife down. When the knife contacts the second static contact piece, the top of the second static contact piece abuts against the inner side of the moving contact piece, so that the knife is stretched open during the downward movement, and then directly clamped on the second static contact piece. In this structure, the knife is always in a clamped state when rotating, and there is a large friction between the first static contact piece and the second static contact piece. The moment the knife contacts the top of the second static contact piece, it is easy to generate a large impact force, which is easy to cause the moving contact piece to deform, and also brings a large resistance to the manual drive switch assembly, causing inconvenience; secondly, there may be a risk of deviation in the process of the knife turning downward, resulting in the top of the second static contact piece not abutting against the inner wall of the moving contact piece but directly hitting the bottom plate of the moving contact piece, causing a collision problem, resulting in damage to the entire knife assembly. Summary of the invention

[0008] In view of the problems in the prior art, the present invention provides an isolating switch, which can significantly improve the convenience and safety of use.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An isolating switch comprises a base, a plurality of knife switch assemblies and a switch assembly, wherein the knife switch assembly comprises a knife switch and a contact piece assembly;

[0011] The knife switch includes an elastic pull rod and two parallel movable contact pieces, wherein the elastic pull rod is arranged between the two movable contact pieces and includes a sleeve, a moving rod, a spring, a support pin and a pin seat;

[0012] There are two moving rods, which are respectively fitted in the two ends of the sleeve and can move axially, and the outer ends of the two moving rods are respectively connected to the two moving contact pieces;

[0013] The two ends of the spring are respectively connected to the two moving rods to provide a pulling force for the two moving rods to move closer together;

[0014] The supporting pins are provided with two pins, the outer ends of the two supporting pins are respectively hinged on the two moving rods, and the inner ends of the two supporting pins are both hinged on the pin seats;

[0015] The pin seat is connected with an extension rod, which passes through the sleeve along the radial direction of the sleeve and extends to the outside of the sleeve, and is connected with a guide wheel;

[0016] The contact piece group is divided into a first static contact piece and a second static contact piece, the first end of the switch blade is hinged on the first static contact piece, and the second end can contact the second static contact piece after descending, and the switch blade has an open position, an intermediate transition position and a closed position relative to the contact piece group;

[0017] The first stationary contact piece is connected to a guide frame for the guide wheel to cooperate with, and the guide frame has an upper starting section and a lower starting section for keeping the guide wheel in place, and a stretching section connected between the upper starting section and the lower starting section and pulling the guide wheel to move in the radial direction of the sleeve to release the two movable contact pieces from the contact piece group;

[0018] When the knife is in the open position, the intermediate transition position and the closed position respectively, the guide wheels are respectively matched on the upper starting section, the stretching section and the lower starting section.

[0019] Preferably, the outer end of the moving rod has a connecting section with a reduced diameter, and an outer step is formed on the moving rod, a limiting component is connected to the connecting section, and an annular groove for assembling the moving contact piece is formed between the outer step and the limiting component.

[0020] Preferably, the pin seat comprises a top plate, a bottom plate, a left plate and a right plate;

[0021] A pin shaft for hinged connection of two supporting pins is arranged between the top plate and the bottom plate;

[0022] The outer side walls of the left side plate and the right side plate are both provided with threaded connection columns for connecting the extension rods.

[0023] Preferably, a limiting wall is provided between the top plate and the bottom plate to limit the angle between the two supporting pins to 180°.

[0024] Preferably, the guide frame comprises a connecting seat and a guide plate;

[0025] The connecting seat is fixed on the first stationary contact piece;

[0026] The guide plate is fixed on the connecting seat, and the upper starting section, the stretching section and the lower starting section are arranged on the guide plate and along the circular arc stroke of the guide wheel rotating around the first stationary contact piece.

[0027] Preferably, the distance from the upper starting section to the elastic pull rod when the gate knife is in the open position is equal to the distance from the lower starting section to the elastic pull rod when the gate knife is in the closed position, and the distance from the stretching surface to the elastic pull rod when the gate knife is in the intermediate transition position is greater than the distance from the upper starting section to the elastic pull rod when the gate knife is in the open position.

[0028] Preferably, the stretching section has a stretching surface and transition surfaces located at the upper and lower ends of the stretching surface, the transition surface is used to connect the upper starting section and the lower starting section, the stretching surface is an arc surface, and is concentric with the arc stroke of the guide wheel rotating around the first static contact piece.

[0029] Preferably, the guide plate has an escape opening for allowing one end of the extension rod facing away from the threaded connection column to pass through.

[0030] Preferably, two elastic pull rods are provided, which are respectively arranged at positions close to both ends of the knife switch, and the threaded connecting columns on the two elastic pull rods are connected by a synchronization rod to achieve synchronization.

[0031] Preferably, the switch assembly comprises a drive shaft and a drive arm;

[0032] The driving shaft is connected to the base, and has a plurality of articulated arms distributed along the axial direction on the driving shaft;

[0033] The lower end of the driving arm is hinged on the hinged arm, and the upper end is hinged on the gate knife.

[0034] The advantages of the present invention are as follows: when the knife gate is in the open position and the closed position, the guide wheel cooperates with the upper starting section and the lower starting section, and the upper starting section and the lower starting section have no effect on the guide wheel, so that the two moving rods are in a contracted state close to each other, so that the two moving contact pieces are clamped on the contact piece group to maintain stability; when the knife gate is switched from the open position to the closed position or from the closed position to the open position, the guide wheel rolls and cooperates with the stretching section, and the stretching section pulls the guide wheel and drives the pin seat to move in the radial direction of the sleeve at the same time, so that the two moving rods drive the two moving contact pieces to move outward and separate from the moving contact pieces, so that the knife gate can be rotated conveniently and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A three-dimensional diagram of the isolating switch provided in this embodiment;

[0036] Figure 2 A schematic diagram of the knife switch provided in this embodiment.

[0037] Figure 3 This is an exploded view of the elastic pull rod provided in this embodiment.

[0038] Figure 4 A schematic diagram of the support pin and the pin seat provided in this embodiment.

[0039] Figure 5 This is a schematic diagram of the guide frame provided in this embodiment.

[0040] Figure 6 A schematic diagram of the knife switch provided in this embodiment being in the open position.

[0041] Figure 7 A schematic diagram of the knife closing process provided in this embodiment.

[0042] Figure 8 A schematic diagram of the knife closing process provided in this embodiment.

[0043] Fig. 9 A schematic diagram of the knife switch provided in this embodiment being in a closed position. DETAILED DESCRIPTION

[0044] Combination Figures 1 to 9 The isolating switch of the present invention is further described.

[0045] like Figure 1-4 As shown, an isolating switch includes a base 1, three sets of knife switch assemblies 5 and a switch assembly 2. The base 1 is a rectangular frame. The three sets of knife switch assemblies 5 are arranged along the length direction of the frame. The switch assembly 2 is arranged on the base 1 and is connected to the three sets of knife switch assemblies 5 at the same time, driving the three sets of knife switch assemblies 5 to be opened and closed synchronously.

[0046] The knife switch assembly 5 includes a knife switch 3 and a contact piece group 4; the knife switch 3 includes an elastic pull rod 32 and two parallel rectangular movable contact pieces 31; the movable contact piece 31 has a plurality of mounting holes 311 distributed along the length direction; the elastic pull rod 32 is arranged between the two movable contact pieces 31, and includes a sleeve 321, a moving rod 322, a spring (not shown in the figure), a support pin 325 and a pin seat 326.

[0047] There are two moving rods 322 , which are respectively fitted in the two ends of the sleeve 321 and can move axially in the sleeve. The outer ends of the two moving rods 322 are both located outside the sleeve and are respectively connected to the two moving contact pieces 31 axially.

[0048] The two ends of the spring are respectively connected to the inner ends of the two moving rods 322, providing a pulling force for the two moving rods 322 to pull the two moving contact pieces 31 toward each other, so that the inner sides of the two moving contact pieces 31 are pressed against the contact piece group 4 in a natural state. In this embodiment, two springs are provided, both of which are arranged at the eccentric position of the inner end of the moving rod 322, and are distributed symmetrically to the center, so as to provide a stable pulling force for the two moving rods 322, and at the same time, the center position of the inner end of the moving rod 322 is reserved for the connection of the support pin 325.

[0049] The support pins 325 have two ends, and the outer ends of the two support pins 325 are respectively hinged to the inner ends of the two moving rods 322, and the inner ends of the two support pins 325 are both hinged to the pin seats 326. Under this structure, an angle (9) is formed between the two support pins 325. Within the range of 180°, when the angle 9 increases, the support pins 325 will push the moving rods 322 to move outward, so that the two moving contact pieces 31 are away from the ends of the sleeve 321.

[0050] The pin holder 326 is connected with an extension rod 324, and a guide hole 3211 is provided on the side wall of the sleeve 321. The extension rod 324 passes through the guide hole 3211 on the sleeve 321 along the radial direction of the sleeve 321 and extends to the outside of the sleeve 321, and is connected with a guide wheel 3241. Through the cooperation between the extension rod 324 and the guide hole 3211, the pin holder 326, the support pin 325 and the moving rod 322 can be restricted from rotating in the sleeve 321, and the pin holder 326 can be moved in the sleeve 321 along the only radial direction of the sleeve 321, so that the pin holder 326 has a stable moving path. During the movement, the pin holder 326 can change the angle between the two support pins 325, thereby driving the two movable contact pieces 31 to move closer or apart.

[0051] like Figure 1As shown, the contact group 4 is divided into a first static contact 41 and a second static contact 42. The first static contact 41 and the second static contact 42 both include a contact and a connection portion forming an L-shaped structure. The contact is in a vertical state and is perpendicular to the moving contact 31 to increase the distance between the two moving contact pieces 31 for the installation of the elastic pull rod 32. The connection portion is in a horizontal state and is installed on the top of the insulating support column on the base 1. A hinge seat 411 is connected to the connection portion of the first static contact 41 by bolts, and the first end of the knife 3 is hinged on the hinge seat 411 of the first static contact 41, and the second end can contact the contact of the second static contact 42 after descending. The entire travel range of the knife 3 when rotating relative to the contact group 4 includes an open position, an intermediate transition position and a closed position. The open position is the position where the knife 3 rotates to the highest point, the closed position is the position where the knife 3 rotates downward to the lowest point, and the intermediate transition position is the position between the highest point and the lowest point of the knife 3.

[0052] like Figure 1 ,5, the first stationary contact piece 41 is connected with a guide frame 43 for the guide wheel 3241 to cooperate with, and the guide frame 43 has an upper starting section 4321 and a lower starting section 4324 for keeping the guide wheel 3241 in place, and a stretching section 4322 connected between the upper starting section 4321 and the lower starting section 4324, and pulling the guide wheel 3241 to move in the radial direction of the sleeve 321 to release the two movable contact pieces 31 from the contact piece group 4. When the gate knife 3 rotates from the open position to the closed position, the guide wheel 3241 is in the upper starting section 4321, the stretching section 4322 and the lower starting section 4324 in sequence, that is, when the gate knife 3 is in the open position, the intermediate transition position and the closed position respectively, the guide wheel 3241 is in the upper starting section 4321, the stretching section 4322 and the lower starting section 4324 respectively.

[0053] like Figure 3 As shown, in the structure of the moving rod 322, the ends of the two moving rods 322 facing each other and located in the sleeve 321 are the inner ends, and the ends facing each other and located outside the sleeve 321 are the outer ends. The outer ends of the moving rods 322 are provided with a connecting section 3221 with a reduced diameter, and an outer step 3222 is formed on the moving rod 322. The connecting section 3221 is connected to a limiting component 323, and an annular groove for assembling the mounting hole 311 on the moving contact piece 31 is formed between the outer step 3222 and the limiting component 323. That is, the outer diameter of the limiting component 323 and the outer diameter of the moving rod 322 are larger than the aperture of the mounting hole 311, so that the moving contact piece 31 can move in the radial direction of the sleeve 321 along with the moving rod 322. The assembly structure between the movable contact piece 31 and the moving rod 322 can fully utilize the distance between the two movable contact pieces 31, so that as many parts of the moving rod 322 as possible can be inserted into the sleeve 321, thereby improving the stability of the moving rod 322 moving in the sleeve 321.

[0054] The limiting component 323 can be connected to the outer end of the connecting section 3221 by threaded connection, riveting or elastic clamp fixing. In this embodiment, threaded connection is selected, that is, the limiting component 323 is a nut.

[0055] The inner end of the moving rod 322 has a slot passing through the center of the moving rod 322 and hooks (not shown in the drawings) located on both sides of the slot. The outer end of the support pin 325 is hinged in the slot through a pin, and the end of the spring is hooked on the hook.

[0056] like Figure 4 As shown, in the pin seat 326 structure, the pin seat 326 includes a top plate 3261, a bottom plate 3263, a left side plate 3262 and a right side plate 3264.

[0057] A pin shaft for hinged connection of the two support pins 325 is arranged between the top plate 3261 and the bottom plate 3263 , and the two pin shafts are distributed along the axial direction of the sleeve 321 .

[0058] The outer side walls of the left and right plates are provided with threaded connection columns 3266 for connecting the extension rod 324. That is, the end of the extension rod 324 facing the threaded connection column 3266 is provided with a threaded hole that matches the threaded connection column 3266. During the assembly process, the threaded hole end of the extension rod 324 can extend into the sleeve 321 through the guide hole 3211 on the side wall of the sleeve 321, and then be connected to the threaded connection column 3266, so as to drive the pin seat 326 to move in the radial direction of the sleeve 321.

[0059] A limiting wall 3265 is provided between the top plate and the bottom plate to limit the angle between the two supporting pins 325 to 180°. When the angle is less than 180°, as long as the extension rod 324 is not subjected to force, the spring can pull the moving rod 322 inward to clamp the moving contact piece 31 on the first stationary contact piece 41, even if the two moving contact pieces 31 are clamped on the contacts of the hinge seat 411 and the first stationary contact piece 41 at the same time.

[0060] like Figure 5 As shown, the guide frame 43 structure includes a connecting seat 431 and a guide plate 432 .

[0061] The connecting seat 431 is fixed to the contact of the first stationary contact piece 41 by means of bolts.

[0062] The guide plate 432 is integrally formed on the connecting seat, and the upper starting section 4321, the stretching section 4322 and the lower starting section 4324 are arranged on the guide plate 432, and are arranged along the arc stroke of the guide wheel 3241 rotating around the hinge seat 411, so that during the opening and closing rotation of the gate knife 3, the guide wheel 3241 can cooperate with the upper starting section 4321, the stretching section 4322 and the lower starting section 4324 in sequence to control the movement of the pin seat 326 in the sleeve 321.

[0063] When the gate knife 3 is in the open position, the distance from the upper starting section 4321 to the pin seat in the elastic pull rod 32 is equal to the distance from the lower starting section 4324 to the pin seat in the elastic pull rod 32 when the gate knife is in the closed position. When the gate knife is in the intermediate transition position, the distance from the stretching section 4322 to the pin seat in the elastic pull rod 32 is greater than the distance from the upper starting section 4321 to the pin seat in the elastic pull rod 32 when the gate knife is in the open position. Specifically, the stretching section 4322 has a stretching surface 43222 and transition surfaces 43221 located at the upper and lower ends of the stretching surface 43222. The transition surface 43221 is used to connect the upper starting section 4321 and the lower starting section 4324, so that the guide wheel 3241 matched on the upper starting section 4321 or the lower starting section 4324 can gradually roll onto the stretching surface 43222 when rotating. When the guide wheel 3241 is at the position of the upper starting section 4321 and the lower starting section 4324, the upper starting section 4321 and the lower starting section 4324 have no force on the guide wheel 3241, so that the guide wheel 3241 and the pin seat 326 have no movement, and the moving rod 322 is only subjected to the spring tension, so that the two moving contact pieces 31 are clamped on the hinge seat 411 and the contact of the first static contact piece 41; when the knife gate 3 rotates, causing the guide wheel 3241 to roll onto the stretching section 4322, the stretching section 4322 drives the guide wheel 3241 and the pin seat 326 to move toward the first end of the knife gate 3, so that the angle 9 between the two supporting pins 325 becomes larger, the moving rod 322 moves outward, the two moving contact pieces 31 open, and there is no clamping force on the hinge seat 411 and the contact on the first static contact piece 41, so the knife gate 3 can be easily rotated.

[0064] The length of the upper starting section 4321 and the lower starting section 4324 is relatively short, and is only used for the cooperation of the guide wheel 3241 when the knife 3 is in the open position and the closed position. The length of the stretching section 4322 is relatively long, and is used for the cooperation of the knife 3 during the entire rotation movement. That is, when the knife 3 starts to rotate from the open position or the closed position, the guide wheel 3241 will roll from the upper starting section 4321 or the lower starting section 4324 to the transition surface 43221, so that the two movable contact pieces 31 are gradually opened and separated from the hinge seat 411 and the contact.

[0065] The stretching surface 43222 is an arc surface and is concentric with the arc stroke of the guide wheel 3241 rotating around the hinge seat. When the guide wheel 3241 rolls from the transition surface 43221 to the stretching surface 43222, the guide wheel 3241 rolls along the stretching surface 43222, and the extension rod 324 will not be further pulled during the process, so that the extension rod 324 remains stable in the axial direction until the guide wheel 3241 rolls to the transition surface 43221 again.

[0066] like Figure 3,5, the guide plate 432 has an escape opening 4323 extending up and down for the end of the extension rod 324 facing away from the threaded connection column 3266 to pass through. Specifically, the end of the extension rod 324 facing away from the threaded connection column 3266 has a rotating shaft perpendicular to the extension rod 324, and there are two guide wheels 3241, which are respectively installed on the two ends of the rotating shaft. During the matching process, the two guide wheels 3241 are attached to the side wall of the guide plate 432 facing away from the elastic pull rod 32 and are located on both sides of the escape opening 4323 and roll, so as to drag the extension rod 324. By dragging, the pin seat 326 can be easily driven to move.

[0067] like Figure 1 As shown, two elastic pull rods 32 are provided, which are respectively provided at positions close to both ends of the knife switch 3. The threaded connection columns 3266 on the two elastic pull rods 32 are connected by a synchronization rod 33 to achieve synchronization. The two elastic pull rods 32 can drive the two movable contact pieces 31 to separate or approach at the same time at positions close to both ends, ensuring the consistency of the movements of the two movable contact pieces 31, which can facilitate the clamping and separation with the contact piece group 4, and can also avoid the deformation problem of the two movable contact pieces 31 caused by uneven force.

[0068] The switch assembly 2 includes a driving shaft 21 and a driving arm 22 .

[0069] The driving shaft 21 is connected to the base 1 and has a plurality of hinged arms 211 distributed along the axial direction. The driving arm 22 is an insulating column, the lower end of which is hinged to the hinged arm 211, and the upper end of which is hinged to the two moving contact pieces 31 of the switch 3 through a pin shaft.

[0070] During use, when the knife switch 3 is in the open position and the closed position, the guide wheel 3241 is matched with the upper starting section 4321 and the lower starting section 4324, and the upper starting section 4321 and the lower starting section 4324 have no effect on the guide wheel 3241. The spring pulls the two moving rods 322 closer to each other, so that the two moving contact pieces 31 connected to the moving rods 322 are closer and clamped on the contact piece group 4 to maintain stability.

[0071] When the knife gate 3 needs to be closed or opened, that is, when it rotates from the open position to the closed position or from the closed position to the open position, the guide wheel 3241 rolls from the upper starting section 4321 or the lower starting section 4324 to the stretching section 4322, and the stretching section 4322 drives the guide wheel 3241 to move toward the first end of the knife gate 3, so that the angle between the two support pins 325 becomes larger, the two moving rods 322 are pushed outward, and the two moving contact pieces 31 connected to the moving rods 322 move outward synchronously, without clamping the contact piece group 4, and the knife gate 3 can be easily rotated. In particular, when the knife gate 3 is closed, the two moving contact pieces 31 can rotate to the two sides of the second static contact piece 42 contact without contacting the top of the second static contact piece 42 contact, and then clamp the contact of the second static contact piece 42.

[0072] Specifically, Figure 7 As shown in FIG. 1 , during the closing process of the knife switch 3, when the bottom 6 of the moving contact piece 31 and the top 7 of the contact of the second stationary contact piece 42 are at the same height, the guide wheel 3241 is matched on the stretching surface 43222, and the two moving contact pieces 31 are in an open state, so they will not contact the top 7 of the contact of the second stationary contact piece 42 when moving downward, until the top 8 of the moving contact piece 31 and the top 7 of the contact are at the same height or lower than the top 7 of the contact. Figure 8 As shown, the guide wheel 3241 starts to roll onto the transition surface 43221, and the two movable contact pieces 31 gradually move closer to gradually clamp the contacts until the knife 3 rotates to the lowest position, i.e., the closed position. Fig. 9 As shown, the guide wheel 3241 also rolls to the lower starting section 4324 at the same time, and the two moving contact pieces 31 completely clamp the contacts.

[0073] In the elastic pull rod 32, since the spring is hidden in the sleeve 321, the pulling force of the spring on the moving contact piece 31 cannot be adjusted during use. The pulling force is determined by the elastic force of the spring after leaving the factory. Therefore, it can effectively avoid the problem of non-professionals accidentally adjusting the clamping force between the moving contact pieces 31.

[0074] Unless otherwise specified, in the present invention, the terms "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the accompanying drawings and according to specific circumstances.

[0075] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An isolating switch, comprising a base (1), a plurality of knife switch assemblies (5) and a switch assembly (2), wherein: The switch blade assembly (5) comprises a switch blade (3) and a contact piece group (4); The switch blade (3) comprises an elastic pull rod (32) and two movable contact pieces (31) arranged in parallel, wherein the elastic pull rod (32) is arranged between the two movable contact pieces (31) and comprises a sleeve (321), a moving rod (322), a spring, a support pin (325) and a pin seat (326); The movable rods (322) are provided with two, respectively fitted in the two ends of the sleeve (321) and capable of axial movement, and the outer ends of the two movable rods (322) are respectively connected to the two movable contact pieces (31); The two ends of the spring are respectively connected to the two moving rods (322), providing a pulling force for the two moving rods (322) to move closer together; The supporting pins (325) have two ends, the outer ends of the two supporting pins (325) are respectively hinged on the two moving rods (322), and the inner ends of the two supporting pins (325) are both hinged on the pin seats (326); The pin seat (326) is connected to an extension rod (324), the extension rod (324) passes through the sleeve (321) along the radial direction of the sleeve (321) and extends to the outside of the sleeve (321), and is connected to a guide wheel (3241); The contact piece group (4) is divided into a first stationary contact piece (41) and a second stationary contact piece (42); the first end of the knife switch (3) is hinged on the first stationary contact piece (41); the second end of the knife switch (3) is able to contact the second stationary contact piece (42) after descending; the knife switch (3) has an open position, an intermediate transition position and a closed position relative to the contact piece group (4); The first stationary contact piece (41) is connected to a guide frame (43) for cooperating with the guide wheel (3241); the guide frame (43) has an upper starting section (4321) and a lower starting section (4324) for keeping the guide wheel (3241) in place, and a stretching section (4322) connected between the upper starting section (4321) and the lower starting section (4324) and for pulling the guide wheel (3241) to move in the radial direction of the sleeve (321) so that the two movable contact pieces (31) release the contact piece group (4); When the knife gate (3) is respectively in the open position, the intermediate transition position and the closed position, the guide wheel (3241) is respectively engaged with the upper starting section (4321), the stretching section (4322) and the lower starting section (4324); When the gate knife (3) is in the open position, the distance from the upper starting section (4321) to the elastic pull rod (32) is equal to the distance from the lower starting section (4324) to the elastic pull rod (32) when the gate knife (3) is in the closed position; when the gate knife is in the intermediate transition position, the distance from the stretching surface (43222) to the elastic pull rod (32) is greater than the distance from the upper starting section (4321) to the elastic pull rod (32) when the gate knife is in the open position; The stretching section (4322) comprises a stretching surface (43222) and transition surfaces (43221) located at upper and lower ends of the stretching surface (43222); the transition surface (43221) is used to connect the upper starting section (4321) and the lower starting section (4324); the stretching surface (43222) is an arc surface and is concentric with the arc stroke of the guide wheel (3241) rotating around the first static contact piece (41).

2. The isolating switch according to claim 1, characterized in that: The outer end of the moving rod (322) has a connecting section (3221), the diameter of the connecting section (3221) is smaller than the diameter of the moving rod (322), an outer step (3222) is formed on the moving rod (322), a limiting component (323) is connected to the connecting section (3221), and an annular groove for assembling the moving contact piece (31) is formed between the outer step (3222) and the limiting component (323).

3. The isolating switch according to claim 1, characterized in that: The pin seat (326) comprises a top plate (3261), a bottom plate (3263), a left side plate (3262) and a right side plate (3264); A pin shaft for hinged connection of two support pins (325) is arranged between the top plate and the bottom plate; The outer side walls of the left plate and the right plate are both provided with threaded connection posts (3266) for connecting the extension rod (324).

4. The isolating switch according to claim 3, characterized in that: A limiting wall (3265) is provided between the top plate (3261) and the bottom plate (3263) to limit the angle between the two supporting pins (325) to 180°.

5. The isolating switch according to claim 1, characterized in that: The guide frame (43) comprises a connecting seat (431) and a guide plate (432); The connecting seat (431) is fixed on the first stationary contact piece (41); The guide plate (432) is fixed on the connecting seat (431), and the upper starting section (4321), the stretching section (4322) and the lower starting section (4324) are provided on the guide plate (432) and are arranged along the circular arc stroke of the guide wheel (3241) rotating around the first stationary contact piece (41).

6. The isolating switch according to claim 5, characterized in that: The guide plate (432) has an escape opening (4323) for the end of the extension rod (324) facing away from the threaded connection column (3266) to pass through.

7. The isolating switch according to claim 3, characterized in that: Two elastic pull rods (32) are provided, respectively disposed at positions close to both ends of the knife gate (3); the threaded connection columns (3266) on the two elastic pull rods (32) are connected via a synchronization rod (33) to achieve synchronization.

8. The isolating switch according to claim 1, characterized in that: The switch assembly (2) comprises a drive shaft (21) and a drive arm (22); The drive shaft (21) is connected to the base (1), and has a plurality of hinged arms (211) distributed along the axial direction on the drive shaft (21); The lower end of the driving arm (22) is hinged on the hinged arm (211), and the upper end is hinged on the gate knife (3).

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