Self-locking disconnecting link and three-station disconnecting switch

Abstract

The invention relates to the technical field of electrical switches, and provides a self-locking disconnecting link, which comprises a disconnecting link piece with two blades; a locking assembly is connected between the two blades and comprises two locking shafts which are located between the two blades and are coaxially arranged. One end of the lock shaft is connected with the blade; the chuck has an inclined surface; the chucks of the two lock shafts are jointly connected with a locking trigger piece in a sleeved mode. The locking trigger piece comprises a cylindrical barrel, and two annular discs are fixedly arranged on the inner wall of the barrel. Each annular disc is fixedly provided with a plurality of abutting heads facing the inclined face of the chuck on the corresponding side. Supporting holes are formed in the two locking shafts, and the two supporting holes are movably connected with the same supporting shaft in a sleeved mode. Therefore, after the locking assembly is in contact with the contact, centripetal clamping force is generated on the two blades, and the contact quality is guaranteed. Therefore, the distance between the two blades does not need to be too small, the kinetic friction force between the blades and the contact is reduced, and the service life is prolonged. The invention further provides a three-position disconnecting switch which is provided with the self-locking disconnecting link.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical switches, and in particular relates to a self-locking knife switch and a three-position isolating switch. Background Art

[0002] For example, in the three-position disconnector disclosed in Chinese patent CN203871257U, the connection between the knife switch and the contact is: two blades clamp the side of the contact from the outside. To ensure good contact between the two, the distance between the two blades is slightly smaller than the width of the contact. After clamping, a certain clamping force is generated between the blades and the side of the contact to ensure the contact quality between the two.

[0003] Therefore, the existing structural design also causes a certain amount of friction between the blade and the contact when the knife switch is in operation, thereby causing wear. After long-term use, poor contact will occur due to large wear, requiring increased inspection frequency and component replacement frequency.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] In view of the above-mentioned defects, the present invention mainly provides a self-locking knife switch to solve the technical problems of increased wear, reduced service life and contact quality caused by over-tightening of the knife switch and the contact clamp.

[0006] In order to solve the above problems, the present invention provides a self-locking knife switch, comprising a knife switch component, wherein the knife switch component has two blades arranged opposite to each other; a locking assembly is connected between the two blades;

[0007] The locking assembly comprises two coaxially arranged locking shafts located between the two blades; one end of the locking shaft is connected to the blade on the corresponding side, and the other end is fixedly sleeved with a chuck; the thickness of the chuck gradually increases from the outer circumference to the center to form an inclined surface; the chucks of the two locking shafts are jointly sleeved with a locking trigger;

[0008] The locking trigger member comprises a cylindrical body, on the inner wall of which two annular discs are fixedly arranged; each annular disc is fixedly provided with a plurality of abutment joints facing the inclined surface of the corresponding clamping disc;

[0009] Support holes are provided in the two locking shafts, and the two support holes are movably sleeved with the same support shaft.

[0010] According to the self-locking knife gate of the present invention, a plurality of steel balls for abutting against the outer wall of the support shaft are evenly embedded on the inner wall of the support hole.

[0011] According to the self-locking knife gate of the present invention, the locking shaft movably passes through the blade, and one end of the locking shaft passing through the blade is fixedly connected to the baffle.

[0012] According to the self-locking knife gate of the present invention, the locking shaft is fixedly connected to the blade.

[0013] According to the self-locking knife gate of the present invention, an outer rim for preventing the locking triggering member from falling off is provided on the outer circumference of the chuck.

[0014] A three-position disconnector, having the self-locking knife switch, comprises an operating mechanism and a position switching mechanism; the operating mechanism is connected to the position switching mechanism through a transmission assembly;

[0015] The station switching mechanism comprises three groups of switch assemblies arranged in parallel at equal intervals; the switch assembly comprises a circuit breaker pole, on which the switch member is rotatably connected; and further comprises a connection contact and a grounding contact;

[0016] The transmission assembly synchronously drives the knife switch components of the three switch assemblies to rotate, switching the working position state between the connection contact and the grounding contact;

[0017] One end of the two blades of the knife switch is rotatably connected to the pole of the circuit breaker, and the other end is used to connect the contact or the grounding contact; a sleeve is provided between the two blades of the knife switch; two support columns are fixed on the outer wall of the sleeve, and each support column is rotatably connected to the blade on the corresponding side;

[0018] The threaded rod is threadedly sleeved in the sleeve, and the threaded rod is connected to the rotating shaft through a universal joint; the rotating shaft is connected to the transmission assembly.

[0019] According to the three-position disconnector of the present invention, the position states of the knife switch member include:

[0020] Connected state: the switch is connected to the connecting contact;

[0021] Grounding state: the switch is connected to the grounding contact;

[0022] Isolation state: the switch is not connected to either the connection contact or the grounding contact.

[0023] According to the three-position disconnector of the present invention, the closing contact is further provided with a side guide surface.

[0024] According to the three-position disconnector of the present invention, a guide piece is further provided on the side of the connection contact facing the knife switch; a guide groove is provided on the guide piece, and the lower end of the threaded rod movably extends into the guide groove.

[0025] According to the three-position disconnector of the present invention, the thread on the threaded rod is trapezoidal.

[0026] In summary, the self-locking knife switch of the present invention generates a centripetal clamping force on the two blades after the locking assembly contacts the contact, thereby ensuring the contact quality. Therefore, the distance between the two blades does not need to be too small, which reduces the dynamic friction between the two blades and the contact and increases the service life. The present invention also provides a three-position disconnector having the self-locking knife switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an embodiment of an isolating switch of the present invention;

[0028] Figure 2 yes Figure 1 The structural diagram of the middle part of the area;

[0029] Figure 3 It is a structural schematic diagram of the transmission assembly of the isolating switch of the present invention;

[0030] Figure 4 yes Figure 3 Schematic diagram of the structure of the middle B area;

[0031] Figure 5 yes Figure 2 Schematic diagram of the structure of the middle A area;

[0032] Figure 6 It is a structural schematic diagram of the isolation state of the isolation switch of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the grounding state of the isolating switch of the present invention;

[0034] Figure 8 yes Figure 5 Schematic diagram of the cross-sectional structure along the C axis;

[0035] Fig. 9 yes Figure 8 Schematic diagram of the structure in the middle D direction;

[0036] In the figure: 1-knife switch, 11-circuit breaker pole, 12-blade; 2-connection contact, 21-insulator, 22-bracket, 23-guide, 24-contact seat, 25-upper guide surface, 26-side guide surface; 3-grounding contact, 4-threaded rod, 41-sleeve, 411-support column; 42-rotating shaft seat, 43-rotating shaft, 44-transmission chain, 45-universal joint; 5-locking shaft, 51-support hole, 52-steel ball, 53-baffle, 54-chuck, 541-outer rib; 55-support shaft; 6-cylinder, 61-annular disk, 62-butt joint; 100-operating mechanism, 101-drive motor, 102-magnetic fluid; 200-frame box, 201-mounting plate; 300-transmission assembly, 400-locking assembly. DETAILED DESCRIPTION

[0037] See also Figure 5 The present invention provides a self-locking knife gate, comprising a knife gate component 1, wherein the knife gate component 1 has two blades 12 arranged opposite to each other; a locking assembly 400 is connected between the two blades 12;

[0038] See also Figure 8 The locking assembly 400 includes two coaxially arranged locking shafts 5 located between the two blades 12; one end of the locking shaft 5 is connected to the blade 12 on the corresponding side, and the other end is fixedly sleeved with a chuck 54; the thickness of the chuck 54 gradually increases from the outer circumference to the center, forming an inclined surface; the chucks 54 of the two locking shafts 5 are jointly sleeved with a locking trigger;

[0039] Recombination Fig. 9 The locking trigger member includes a cylindrical body 6, on the inner wall of which two annular discs 61 are fixedly provided; each annular disc 61 is fixedly provided with a plurality of abutment heads 62 with inclined surfaces facing the corresponding side clamping disc 54;

[0040] A support hole 51 is formed in each of the two locking shafts 5 , and the two support holes 51 are movably connected to the same support shaft 55 ; the support shaft 55 is used to bear the torsion in the longitudinal plane.

[0041] When closing the circuit, when the cylinder 6 touches the contact, the abutment heads 62 of the two annular disks 61 abut against the inclined surface of the clamping disk 54 and slide radially due to the thrust of the contact, so that the two locking shafts 5 move closer to the center, thereby pulling the two blades 12 to move closer to the center, thereby generating a larger clamping force, making the blades 12 in surface contact with the contact, thereby ensuring the contact quality.

[0042] After the locking assembly 400 contacts the contact, the present invention generates a centripetal clamping force on the two blades 12 to ensure the contact quality. Therefore, the distance between the two blades 12 does not need to be too small, which reduces the dynamic friction between the blades and the contact and increases the service life.

[0043] As an embodiment, a plurality of steel balls 52 are evenly embedded on the inner wall of the support hole 51 ; the steel balls 52 abut against the outer wall of the support shaft 55 to reduce the friction force when the lock shaft 5 moves.

[0044] As an embodiment, the lock shaft 5 of the present invention is fixedly connected to the blade 12 .

[0045] As an embodiment, the lock shaft 5 of the present invention movably passes through the blade 12, and one end of the lock shaft 5 passing through the blade 12 is fixedly connected to the baffle 53; the lock shaft 5 and the blade 12 are in a sliding fit state. When the switch is closed, the offset can be adjusted automatically according to the specific contact position to ensure the contact quality.

[0046] As an embodiment, an outer circumference of the chuck 54 is provided with an outer retaining edge 541 to prevent the locking trigger member from falling off.

[0047] See also Figure 1 The present invention also provides a three-position disconnector having the self-locking knife switch, comprising an operating mechanism 100 and a position switching mechanism; the operating mechanism 100 is connected to the position switching mechanism via a transmission assembly 300;

[0048] See also Figure 2 The station switching mechanism includes three groups of switch components arranged in parallel at equal intervals; the switch component includes a circuit breaker pole 11, and the circuit breaker pole 11 is rotatably connected to the switch member 1; and also includes a connection contact 2 and a grounding contact 3;

[0049] The transmission assembly 300 synchronously drives the knife switch components 1 of the three switch assemblies to rotate, switching the working position state between the connection contact 2 and the grounding contact 3; Figure 6 and Figure 7 , the working position states of the knife switch member 1 include:

[0050] Connected state: the switch element 1 is connected to the connecting contact 2;

[0051] Grounding state: the switch 1 is connected to the grounding contact 3;

[0052] Isolation state: the switch 1 is not connected to the connection contact 2 and the grounding contact 3;

[0053] See also Figure 3 and Figure 4 One end of the two blades 12 of the knife switch 1 is rotatably connected to the circuit breaker pole 11, and the other end is used to connect the contact 2 or the grounding contact 3; a sleeve 41 is provided between the two blades 12 of the knife switch 1; two support columns 411 are fixed on the outer wall of the sleeve 41, and each support column 411 is rotatably connected to the blade 12 on the corresponding side;

[0054] The sleeve 41 is threadedly sleeved with a threaded rod 4, and the threaded rod 4 is connected to a rotating shaft 43 via a universal joint 45; the rotating shaft 43 is connected to the transmission assembly 300;

[0055] The transmission assembly 300 synchronously drives the three rotating shafts 43 to rotate in a forward or reverse direction, so that the sleeve 41 moves along the axial direction of the threaded rod 4, thereby rotating the knife switch 1 and switching the working position state between the connection contact 2 and the grounding contact 3.

[0056] The isolating switch of the present invention controls the rotation of the knife switch 1 by means of thread transmission, and can accurately control the rotation angle and the stop position of the knife switch 1, so that the position adjustment is precisely controllable. In addition, the thread matching clearance is small, and the knife switch 1 has no retreat space, which ensures the effective contact of the joint.

[0057] Furthermore, the thread on the threaded rod 4 is a trapezoidal thread with high matching accuracy, which is conducive to accurately controlling the movement trajectory of the knife gate component 1.

[0058] As an embodiment, the transmission assembly 300 includes a sprocket fixedly mounted on three rotating shafts 43, and the sprockets between two adjacent rotating shafts 43 are connected by a transmission chain 44; the rotation of the rotating shaft 43 located in the middle is driven, and the synchronous and same-speed rotation of the three rotating shafts 43 can be achieved through the cooperation of the transmission chain 44 and the sprocket.

[0059] As an embodiment, the operating mechanism 100 has a magnetic fluid 102; the rotating shaft 43 of the switch assembly located in the middle position is connected to the magnetic fluid 102; the operating mechanism 100 also includes a driving motor 101, and the driving motor 101 is connected to the magnetic fluid 102 through a gear set;

[0060] The driving motor 101 can accurately control the parameters such as the rotation direction, number of rotations, and rotation speed of the rotating shaft 43, thereby accurately controlling the switching action of the working position state of the knife switch component 1.

[0061] The operating mechanism 100 of the present invention can select a known applicable device, such as the structure disclosed in Chinese patent CN202210388226.8.

[0062] As an embodiment, the present invention further comprises a frame box 200, wherein the switch assembly is installed in the frame box 200; the rotating shaft 43 is arranged in the rotating shaft seat 42, and the rotating shaft seat 42 is fixed on the mounting plate 201; the mounting plate 201 is fixedly arranged outside the frame box 200; the operating mechanism 100 is fixedly arranged on the mounting plate 201;

[0063] The overall structure is compact, stable, and easy to manufacture, install, and use.

[0064] As an embodiment, a guide member 23 is further provided on the side of the connection contact 2 facing the knife switch 1; a guide groove is opened on the guide member 23, and the lower end of the threaded rod 4 is movably extended into the guide groove; during the rotation of the threaded rod 4, the guide member 23 limits the lateral swing of the threaded rod 4, so that it can only swing back and forth along the direction of the guide groove, ensuring that the two blades 12 of the knife switch 1 can be accurately clamped with the contact to maintain the quality of the joint.

[0065] Furthermore, the guide member 23 has two parallel guide plates, and the guide groove is formed between the two guide plates. The guide plates increase the blocking area to prevent the threaded rod 4 from escaping from the guide groove at the extreme position.

[0066] See also Figure 5As an embodiment, the structure of the connection contact 2 is that the width gradually increases from the top to the bottom, so that the two blades 12 of the knife switch 1 can only clamp on the two sides of the connection contact 2 to ensure the contact quality.

[0067] Furthermore, the top of the connection contact 2 has an inclined upper guide surface 25 to prevent the blade 12 from being blocked on the top plane of the connection contact 2 due to deviation.

[0068] As an embodiment, the connecting contact 2 is fixed on the contact seat 24, and the contact seat 24 is fixed on the insulator 21; each insulator 21 is fixedly mounted on the bracket 22, which is convenient for position fixation. The guide member 23 is fixed on the contact seat 24.

[0069] Preferably, the contact 2 is also provided with a side guide surface 26 for contacting with the cylinder 6 of the locking assembly 400. In the process of switching to the on state, the cylinder 6 of the locking assembly 400 contacts the side guide surface 26 and moves along the side guide surface 26. The clamping force of the two blades 12 is gradually increased. When the knife switch 1 moves to the right position, the clamping force of the two blades 12 is increased to the maximum, which ensures the contact quality between the blades 12 and the contact 2, reduces the dynamic friction between the two, and reduces the wear.

[0070] In summary, the present invention provides a self-locking knife switch, which generates a centripetal clamping force on the two blades after the locking assembly contacts the contact, thereby ensuring the contact quality. Therefore, the distance between the two blades does not need to be too small, which reduces the dynamic friction between the two blades and the contact, and increases the service life. The present invention also provides a three-position disconnector having the self-locking knife switch.

[0071] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A self-locking knife switch, characterized in that: It comprises a knife gate component, wherein the knife gate component has two blades arranged opposite to each other; a locking assembly is connected between the two blades; The locking assembly comprises two coaxially arranged locking shafts located between the two blades; one end of the locking shaft is connected to the blade on the corresponding side, and the other end is fixedly sleeved with a chuck; the thickness of the chuck gradually increases from the outer circumference to the center to form an inclined surface; the chucks of the two locking shafts are jointly sleeved with a locking trigger; The locking trigger member comprises a cylindrical body, on the inner wall of which two annular discs are fixedly arranged; each annular disc is fixedly provided with a plurality of abutment joints facing the inclined surface of the corresponding clamping disc; Support holes are provided in the two locking shafts, and the two support holes are movably sleeved with the same support shaft.

2. The self-locking knife switch according to claim 1, characterized in that: A plurality of steel balls for abutting against the outer wall of the support shaft are evenly embedded on the inner wall of the support hole.

3. The self-locking knife switch according to claim 1, characterized in that: The lock shaft movably passes through the blade, and one end of the lock shaft passing through the blade is fixedly connected to the baffle.

4. The self-locking knife switch according to claim 1, characterized in that: The lock shaft is fixedly connected to the blade.

5. The self-locking knife switch according to claim 1, characterized in that: The outer circumference of the chuck is provided with an outer retaining edge for preventing the locking trigger member from falling off.

6. A three-position disconnector having a self-locking knife switch as claimed in any one of claims 1 to 5, characterized in that: It includes an operating mechanism and a workstation switching mechanism; the operating mechanism is connected to the workstation switching mechanism through a transmission assembly; The station switching mechanism comprises three groups of switch assemblies arranged in parallel at equal intervals; the switch assembly comprises a circuit breaker pole, on which the switch member is rotatably connected; and further comprises a connection contact and a grounding contact; The transmission assembly synchronously drives the knife switch components of the three switch assemblies to rotate, switching the working position state between the connection contact and the grounding contact; One end of the two blades of the knife switch is rotatably connected to the pole of the circuit breaker, and the other end is used to connect the contact or the grounding contact; a sleeve is provided between the two blades of the knife switch; two support columns are fixed on the outer wall of the sleeve, and each support column is rotatably connected to the blade on the corresponding side; The threaded rod is threadedly sleeved in the sleeve, and the threaded rod is connected to the rotating shaft through a universal joint; the rotating shaft is connected to the transmission assembly.

7. The three-position isolating switch according to claim 6, characterized in that: The working position states of the knife switch member include: Connected state: the switch is connected to the connecting contact; Grounding state: the switch is connected to the grounding contact; Isolation state: the switch is not connected to either the connection contact or the grounding contact.

8. The three-position isolating switch according to claim 6, characterized in that: The closing contact is also provided with a side guide surface.

9. The three-position isolating switch according to claim 6, characterized in that: A guide piece is also provided on the side of the connection contact facing the knife switch piece; a guide groove is provided on the guide piece, and the lower end of the threaded rod movably extends into the guide groove.

10. The three-position isolating switch according to claim 6, characterized in that: The threads on the threaded rod are trapezoidal threads.

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