Guiding device for circuit breaker and circuit breaker

Abstract

The invention provides a guide device for a circuit breaker and the circuit breaker, and belongs to the technical field of switch equipment. The guide device comprises a fixed seat which is clamped and fixed between an insulating sleeve and a crank arm box of the circuit breaker, a guide cylinder is arranged on the fixed seat, and the guide device further comprises a connector which is connected between a connecting rod in the crank arm box and an insulating pull rod in the insulating sleeve. A guide ring used for being in guide sliding fit with the inner wall of the guide cylinder is installed on the peripheral face of the connector, the axial length of the inner wall of the guide cylinder meets the requirement that the guide ring can be in contact guide fit with the inner wall of the guide cylinder all the time when the connector moves in the opening and closing process of the circuit breaker, and the axial length of the connector is smaller than that of the guide cylinder. Compared with the prior art, the length of the guide piece arranged in the guide cylinder is shortened, and the length of a moving part is not increased while indirect guide of the insulating pull rod is guaranteed, so that the length of the insulating sleeve and the circuit breaker is not increased, and transportation and on-site installation and arrangement are facilitated.

Description

Technical Field

[0001] The invention relates to a guide device for a circuit breaker and the circuit breaker, belonging to the technical field of switch equipment. Background Art

[0002] Circuit breakers play a key role in power systems and can separate and close rated currents, interrupt fault currents or switch lines. For example, a Chinese utility model patent with authorization announcement number CN220290692U discloses a 126kV porcelain column vacuum circuit breaker pole, which includes an arc extinguishing chamber porcelain bushing, a supporting porcelain bushing, and a transmission housing (i.e., a crank box). A transmission shaft is provided in the crank box, and the transmission shaft is connected to an insulating pull rod through a crank and a joint. The insulating pull rod is connected to a moving end assembly, and a guide sleeve is provided on the outside of the moving contact of the moving end assembly. Since the crank arm is a rotational motion, the insulating pull rod does not move in a linear manner, resulting in the force acting on the moving end assembly not being centered. In addition, the guide sleeve is far away from the crank arm, and the insulating pull rod is relatively long, so vibration is easily generated during movement, resulting in severe eccentric wear between the moving contact and the guide sleeve, and the generated metal foreign matter affects the breaking performance of the circuit breaker.

[0003] In this regard, the Chinese utility model patent with authorization announcement number CN204927167U discloses a guide support device and a pillar porcelain column circuit breaker using the device. The circuit breaker adopts two sections of porcelain casing, and a guide plate for guiding the insulating rod is sandwiched between the two sections of porcelain casing. This scheme makes the structure of the porcelain casing complicated, and due to the influence of the material, guiding the insulating rod is prone to cause wear of the insulating rod.

[0004] The Chinese invention patent application with application publication number CN108565192A discloses a circuit breaker and an insulating pull rod guide device of the circuit breaker, wherein the guide device is arranged in an insulating sleeve, and the insulating sleeve is a complete sleeve. Compared with the circuit breaker in CN204927167U, the structure is simplified, but the guide device includes a plurality of guide plates, each of which is provided with a guide hole for guiding the insulating pull rod, and adjacent guide plates are connected by support rods. The structure of the guide device is too complicated and will also cause wear of the insulating pull rod.

[0005] The Chinese invention patent application with application publication number CN111312554A discloses a vacuum circuit breaker, in which a support cylinder is provided between the insulating sleeve and the crank arm box, and a sealing flange is clamped between the insulating sleeve and the support cylinder, a guide sleeve is provided on the sealing flange, and a connecting rod and a hinged rod are connected between the insulating pull rod and the crank arm, the connecting rod cooperates with the guide sleeve, and the insulating pull rod is guided by guiding the connecting rod. Compared with the circuit breaker in CN108565192A, this scheme cancels the guide device including multiple guide plate structures, and no longer directly guides the insulating pull rod, but it needs to install components such as a support cylinder, a connecting rod and a hinged rod, resulting in a relatively large height dimension of the circuit breaker, which is not convenient for transportation and on-site installation and arrangement, and the number of cylinders and rods is relatively large, and the structure is also relatively complex.

[0006] The Chinese utility model patent with the authorization announcement number CN213093122U discloses a circuit breaker and a gas-insulated switchgear using the circuit breaker. The circuit breaker includes a main housing (i.e., an insulating sleeve) and a small housing (i.e., a crank arm box). A contact unit and an insulating pull rod are arranged in the main housing. A piston cylinder is clamped and fixed between the main housing and the crank arm box. A transmission shaft is arranged in the crank arm box. A crank arm is connected to the transmission shaft. A connecting rod is connected to the crank arm. A piston is connected between the connecting rod and the insulating pull rod. The piston is guided and matched with the piston cylinder. The piston cylinder includes a flange part and a barrel part. An annular protrusion is arranged at the inner hole end of the barrel part. A sealing ring and a guide ring are arranged on the inner wall of the annular protrusion. The piston includes a cylindrical plug body and a blocking body located at one end of the cylindrical plug body. The cylindrical plug body contacts and matches with the sealing ring and the guide ring. Connecting rods are connected to both sides of the blocking body, wherein the connecting rod on one side is connected to the insulating pull rod, and the connecting rod on the other side is connected to the connecting rod. Compared with the vacuum circuit breaker in CN111312554A, this solution reduces a supporting cylinder and a rod section, and the structure is simplified. However, the sealing ring and the guide ring are arranged on the piston cylinder, and the axial dimension of the annular protrusion is relatively small, while the axial dimension of the cylindrical plug body of the piston is relatively large, so as to meet the guiding needs of the piston movement. However, this also leads to a relatively large overall length of the piston, which is longer than the length of the cylinder part of the piston cylinder. The piston is connected between the connecting rod and the insulating pull rod, which lengthens the length of the moving part, thereby resulting in a relatively long length of the insulating sleeve. That is, the length dimension of the circuit breaker is still relatively large, and there is still a problem of inconvenience in transportation and on-site installation and layout. Summary of the invention

[0007] The object of the present invention is to provide a guide device for a circuit breaker to solve the problem in the prior art that the overall length of the piston is relatively large, and the length of the moving part connected between the connecting rod and the insulating pull rod is lengthened, thereby resulting in a relatively long length of the insulating sleeve, a relatively large length dimension of the circuit breaker, and inconvenience in transportation and on-site installation and arrangement; the object of the present invention is also to provide a circuit breaker to solve the above-mentioned problems.

[0008] In order to achieve the above-mentioned purpose, the circuit breaker guide device of the present invention adopts the following technical solution: A guide device for a circuit breaker comprises a fixing seat for clamping and fixing between an insulating sleeve and a crank arm box of the circuit breaker, a guide cylinder being arranged on the fixing seat, and the guide device for the circuit breaker further comprises a joint for connecting between a connecting rod in the crank arm box and an insulating pull rod in the insulating sleeve, a guide ring for guiding and slidingly cooperating with an inner wall of the guide cylinder being arranged on an outer peripheral surface of the joint, the axial length of the inner wall of the guide cylinder being sufficient to ensure that the guide ring can always contact and guide with the inner wall of the guide cylinder when the joint moves during the opening and closing process of the circuit breaker, and the axial length of the joint is less than the axial length of the guide cylinder.

[0009] The beneficial effect of the above technical solution is that the present invention belongs to an invention of changing the relationship between elements, in which the setting position of the guide ring is changed, a joint is used as a guide member arranged in the guide cylinder, and the guide ring is installed on the outer peripheral surface of the joint. The axial length of the joint is less than the axial length of the guide cylinder, which is equivalent to shortening the axial length of the piston in the prior art. At the same time, the axial length of the inner wall of the guide cylinder satisfies that when the joint moves during the opening and closing process of the circuit breaker, the guide ring can always contact and guide with the inner wall of the guide cylinder, thereby ensuring that the insulating pull rod is indirectly guided without increasing the length of the moving parts, thereby not increasing the length of the insulating sleeve and the circuit breaker, and facilitating transportation and on-site installation and layout.

[0010] Furthermore, a screw rod is provided on the joint for being threadably connected with the insert at the end of the insulating pull rod.

[0011] Furthermore, the screw is a steel screw used for threaded connection with the aluminum insert at the end of the insulating pull rod, and the joint is an aluminum joint, and the screw is installed on the joint through a threaded structure.

[0012] Furthermore, the circuit breaker guiding device also includes a gasket which is sleeved on the outside of the screw rod and mounted between the insulating pull rod and the joint.

[0013] Furthermore, the guide cylinder and the fixed seat are separately arranged, a mounting flange is arranged on the outer circumferential surface of the guide cylinder, the guide cylinder passes through the fixed seat and the mounting flange is fitted with one side end surface of the fixed seat, and the guide cylinder is installed on the fixed seat by bolts that pass through the mounting flange and are connected to the fixed seat.

[0014] Furthermore, the guide tube is a metal tube, and a bulging arc-shaped shielding surface is provided at the end of the guide tube away from the fixing seat.

[0015] Furthermore, a circular boss is provided on one end face of the fixing seat, and a circular groove is provided on the other end face. The circular boss is used to position and cooperate with the end face groove of one of the insulating sleeve and the elbow box, and the circular groove is used to position and cooperate with the end face boss of the other one of the insulating sleeve and the elbow box.

[0016] Furthermore, a sealing ring installation groove for installing a sealing ring to seal with the insulating sleeve and / or the crank box is provided on at least one side end surface of the fixing seat.

[0017] Furthermore, ventilation holes are provided on the fixing seat and / or the joint so that the insulating gas can reach the inner cavity of the insulating sleeve when the insulating gas is filled through the elbow box.

[0018] In order to achieve the above object, the circuit breaker in the present invention adopts the following technical solution: A circuit breaker comprises an insulating sleeve and a crank arm box, wherein an arc extinguishing chamber and an insulating pull rod are arranged in the insulating sleeve, a transmission shaft is arranged in the crank arm box, a crank arm is mounted on the transmission shaft, and a connecting rod is connected to the crank arm. The circuit breaker also comprises a guiding device, wherein the guiding device comprises a fixing seat clamped and fixed between the insulating sleeve and the crank arm box of the circuit breaker, wherein a guide cylinder is arranged on the fixing seat, and the guiding device also comprises a joint between the connecting rod in the crank arm box and the insulating pull rod in the insulating sleeve, wherein a guiding ring for guiding and sliding cooperation with the inner wall of the guide cylinder is mounted on the outer peripheral surface of the joint, wherein the axial length of the inner wall of the guide cylinder satisfies that the guiding ring can always contact and guide cooperation with the inner wall of the guide cylinder when the joint moves during the opening and closing process of the circuit breaker, and the axial length of the joint is less than the axial length of the guide cylinder.

[0019] The beneficial effect of the above technical solution is that: the present invention is an improved invention, which further defines the structure of the guide device. A joint is used in the guide device as a guide member arranged in the guide cylinder, and the guide ring is installed on the outer peripheral surface of the joint. The axial length of the joint is less than the axial length of the guide cylinder, which is equivalent to shortening the axial length of the piston in the prior art. At the same time, the axial length of the inner wall of the guide cylinder satisfies that when the joint moves during the opening and closing process of the circuit breaker, the guide ring can always contact and guide with the inner wall of the guide cylinder, thereby ensuring that the insulating pull rod is indirectly guided without increasing the length of the moving parts, thereby not increasing the length of the insulating sleeve and the circuit breaker, and facilitating transportation and on-site installation and layout.

[0020] Furthermore, a screw rod is provided on the joint for being threadably connected with the insert at the end of the insulating pull rod.

[0021] Furthermore, the screw is a steel screw used for threaded connection with the aluminum insert at the end of the insulating pull rod, and the joint is an aluminum joint, and the screw is installed on the joint through a threaded structure.

[0022] Furthermore, the guide device also includes a gasket which is sleeved on the outside of the screw and mounted between the insulating pull rod and the joint.

[0023] Furthermore, the guide cylinder and the fixed seat are separately arranged, a mounting flange is arranged on the outer circumferential surface of the guide cylinder, the guide cylinder passes through the fixed seat and the mounting flange is fitted with one side end surface of the fixed seat, and the guide cylinder is installed on the fixed seat by bolts that pass through the mounting flange and are connected to the fixed seat.

[0024] Furthermore, the guide tube is a metal tube, and a bulging arc-shaped shielding surface is provided at the end of the guide tube away from the fixing seat.

[0025] Furthermore, a circular boss is provided on one end face of the fixing seat, and a circular groove is provided on the other end face. The circular boss is used to position and cooperate with the end face groove of one of the insulating sleeve and the elbow box, and the circular groove is used to position and cooperate with the end face boss of the other one of the insulating sleeve and the elbow box.

[0026] Furthermore, a sealing ring installation groove for installing a sealing ring to seal with the insulating sleeve and / or the crank box is provided on at least one side end surface of the fixing seat.

[0027] Furthermore, ventilation holes are provided on the fixing seat and / or the joint so that the insulating gas can reach the inner cavity of the insulating sleeve when the insulating gas is filled through the elbow box. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial structural diagram of a circuit breaker embodiment of the present invention; Figure 2 It is a structural diagram of the guide device in the circuit breaker embodiment of the present invention.

[0029] In the figure: 1. insulating sleeve; 1-1. connecting flange; 2. crank arm box; 3. insulating pull rod; 4. transmission shaft; 5. crank arm; 6. connecting rod; 7. joint; 7-1. large diameter section; 7-2. first small diameter section; 7-3. second small diameter section; 7-4. ear plate; 7-5. perforation; 7-6. second vent hole; 8. fixing seat; 8-1. circular boss; 8-2. circular groove; 8-3. sealing ring mounting groove; 8-4. first vent hole; 9. guide cylinder; 9-1. mounting flange; 9-2. arc shielding surface; 10. screw; 11. gasket; 12. guide ring; 13. bolt; 14. first sealing ring; 15. second sealing ring; 16. pin; 17. stud. DETAILED DESCRIPTION

[0030] In view of the technical problems existing in the prior art, the basic concept of the present invention is to use a joint as a guide member arranged in the guide cylinder, and to install the guide ring on the outer circumferential surface of the joint. The axial length of the joint is smaller than the axial length of the guide cylinder, and the axial length of the inner wall of the guide cylinder satisfies that when the joint moves during the opening and closing process of the circuit breaker, the guide ring can always contact and guide with the inner wall of the guide cylinder, thereby avoiding increasing the length of the moving parts.

[0031] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0032] Embodiment 1 of the circuit breaker of the present invention: like Figure 1 As shown, the circuit breaker includes an insulating sleeve 1 and a crank arm box 2, a transmission shaft 4 is arranged in the crank arm box 2, a crank arm 5 is mounted on the transmission shaft 4, and the crank arm 5 is connected to a connecting rod 6. An arc extinguishing chamber (not shown in the figure) and an insulating pull rod 3 are arranged in the insulating sleeve 1, and the insulating pull rod 3 is connected to the moving end assembly of the arc extinguishing chamber. A guide sleeve or a guide plate for guiding the moving end assembly is arranged in the insulating sleeve 1 to realize the linear motion of the moving end.

[0033] The circuit breaker also includes a guide device, combined with Figure 1 and Figure 2 As shown, the guide device includes a fixing seat 8 for clamping and fixing between the insulating sleeve 1 and the crank box 2, and the fixing seat 8 is a plate-like structure as a whole. A connecting flange 1-1 is fixedly provided at the end of the insulating sleeve 1, and the connecting flange 1-1 is a metal flange, and the end face of the connecting flange 1-1 is protrudingly provided, so as to form a stop structure at the end of the insulating sleeve 1, and the stop structure is specifically an end face groove. The crank box 2 is a metal box, and a stop structure is also provided on the end face of the crank box 2, and the stop structure is specifically an end face boss. Before the guide device is provided, the end face boss of the crank box 2 extends into the end face groove of the insulating sleeve 1, and the two are positioned and matched, and fixed connection is achieved through a stud 17 and a nut. After the guide device is installed, the structure of the fixing seat 8 is adapted to the insulating sleeve 1 and the crank arm box 2. Specifically, a circular boss 8-1 is provided on one end face of the fixing seat 8, and a circular groove 8-2 is provided on the other end face. The circular boss 8-1 extends into the end face groove of the insulating sleeve 1, and the end face boss of the crank arm box 2 extends into the circular groove 8-2, thereby achieving positioning and matching between the three. At the same time, a through hole for the stud 17 to pass through is provided on the fixing seat 8, so that the fixing seat 8 is clamped and fixed between the insulating sleeve 1 and the crank arm box 2, and there is no need to change the original structure of the insulating sleeve 1 and the crank arm box 2.

[0034] In addition, a first sealing ring 14 is arranged on the end face boss of the elbow box 2. The first sealing ring 14 is originally in sealing contact with the end face of the insulating sleeve 1. After the fixing seat 8 is installed, in order to ensure the sealing, a sealing ring installation groove 8-3 is arranged on the end face of the fixing seat 8 facing the insulating sleeve 1, specifically on the end face of the circular boss 8-1, for installing the second sealing ring 15. The second sealing ring 15 is in sealing contact with the end face of the insulating sleeve 1 to ensure the sealing of the insulating sleeve 1, the elbow box 2 and the fixing seat 8.

[0035] like Figure 1 and Figure 2 As shown, the guide device also includes a guide cylinder 9 arranged on the fixed seat 8. The guide cylinder 9 in this embodiment is separately arranged from the fixed seat 8. Specifically, a mounting flange 9-1 is arranged on the outer peripheral surface of the guide cylinder 9. The guide cylinder 9 passes through the fixed seat 8 and the mounting flange 9-1 is in contact with one side end surface of the fixed seat 8 (the end surface of the circular boss 8-1). The guide cylinder 9 is installed on the fixed seat 8 by a bolt 13 that passes through the mounting flange 9-1 and is connected to the fixed seat 8. In this way, the fixed seat 8 and the guide cylinder 9 can be processed separately and then assembled, which is convenient for processing and manufacturing.

[0036] The guiding device also includes a joint 7 for connecting between the connecting rod 6 and the insulating pull rod 3. A guide ring 12 for guiding and slidingly cooperating with the inner wall of the guide cylinder 9 is installed on the outer peripheral surface of the joint 7. The axial length of the inner wall of the guide cylinder 9 satisfies that the guide ring 12 can always contact and guide with the inner wall of the guide cylinder 9 when the joint 7 moves during the opening and closing process of the circuit breaker. The axial length of the joint 7 is less than the axial length of the guide cylinder 9. Compared with the prior art, the present invention shortens the length of the guide member arranged in the guide cylinder. While ensuring indirect guidance of the insulating pull rod 3, the length of the moving parts will not be increased, thereby not increasing the length of the insulating sleeve 1 and the circuit breaker, which is convenient for transportation and on-site installation and layout.

[0037] Specifically in this embodiment, Figure 2 As shown, the joint 7 includes a large diameter section 7-1 and a first small diameter section 7-2 and a second small diameter section 7-3 located on both sides of the large diameter section 7-1. The guide ring 12 is installed on the large diameter section 7-1. The second small diameter section 7-3 is provided with a radially penetrating slot to form two ear plates 7-4. The end of the connecting rod 6 extends between the two ear plates 7-4 and passes through a pin 16 ( Figure 1 As shown in the figure, the hinged connection with the joint 7 is realized, and each ear plate 7-4 is provided with a through hole 7-5 for the pin shaft 16 to pass through.

[0038] The joint 7 is provided with a screw 10 for mating with the insert thread at the end of the insulating pull rod 3, so as to facilitate connection with the insulating pull rod 3. Furthermore, the insert at the end of the insulating pull rod 3 is an aluminum insert, the screw 10 is a steel screw, and the joint 7 is an aluminum joint, and the screw 10 is separately installed on the joint 7 through a thread structure. In this way, the screw 10 and the joint 7, and the screw 10 and the insulating pull rod 3 are connected by two threads of different materials, wherein the insert at the end of the insulating pull rod 3 and the joint 7 are both aluminum parts, which are relatively light in weight, can reduce the weight of the moving parts, and reduce the opening and closing operation work. However, the strength of the aluminum parts is relatively weak, and the connection effect of connecting aluminum threads to aluminum threads is relatively poor, while the strength of the steel parts is relatively good, so the steel screw 10 is used to connect between the two to improve the connection effect, and only the screw 10 is a steel part, which will not increase the weight of the moving parts too much.

[0039] The guide device also includes a gasket 11 for sleeved outside the screw 10 and mounted between the insulating rod 3 and the joint 7. The gasket 11 can ensure the connection and fastening effect between the screw 10 and the insulating rod 3. At the same time, by increasing or decreasing the number of gaskets 11, the length of the moving part can be adjusted, thereby fine-tuning the motion parameters of the moving end assembly. Furthermore, the gasket 11 adopts a disc spring gasket, which can generate a relatively large elastic force, thereby improving the connection and fastening effect between the screw 10 and the insulating rod 3.

[0040] In addition, the crank box 2 is provided with a gas charging connector (not shown in the figure) for charging the insulating gas, so that the charged insulating gas can reach the inner cavity of the insulating sleeve 1, such as Figure 1 As shown, in this embodiment, a first vent hole 8-4 is provided on the fixing seat 8, and a plurality of the first vent holes 8-4 are provided and arranged at intervals along the circumferential direction. At the same time, a second vent hole 7-6 is provided on the joint 7, and a plurality of the second vent holes 7-6 are also provided and arranged at intervals along the circumferential direction, so as to achieve communication between the insulating sleeve 1 and the crank box 2.

[0041] In addition, the guide cylinder 9 in this embodiment is a metal cylinder, such as Figure 2 As shown, the end of the guide cylinder 9 away from the fixing seat 8 is provided with a bulging arc-shaped shielding surface 9-2, and the arc-shaped shielding surface 9-2 can effectively weaken the electric field strength at the connecting flange 1-1 to ensure the performance of the circuit breaker.

[0042] When the circuit breaker of the present invention is used, Figure 1As shown, when closing, the transmission shaft 4 in the crank arm box 2 rotates clockwise, thereby driving the crank arm 5 to rotate clockwise, the crank arm 5 drives the connecting rod 6 to move upward, and then the connecting rod 6 drives the joint 7 to slide upward in the guide cylinder 9. Under the guidance of the guide cylinder 9, the joint 7 drives the insulating pull rod 3 to move upward in a straight line, pushing the moving contact to close. When opening, the transmission shaft 4 in the crank arm box 2 rotates counterclockwise, thereby driving the crank arm 5 to rotate counterclockwise, the crank arm 5 drives the connecting rod 6 to move downward, and then the connecting rod 6 drives the joint 7 to slide downward in the guide cylinder 9. Under the guidance of the guide cylinder 9, the joint 7 drives the insulating pull rod 3 to move downward in a straight line, pulling the moving contact to open.

[0043] At the same time, combined with the guiding effect of the guide sleeve or the guide plate on the moving end assembly, the stable output of the insulating pull rod 3 is achieved, the coaxial centering and action stability of the moving and static contacts in the arc extinguishing chamber are guaranteed, the generation of foreign matter due to eccentric wear of the transmission system is avoided, and the circuit breaker is effectively closed and disconnected. In addition, since the length of the joint 7 is relatively short, the length of the moving parts is shortened, the length of the insulating sleeve and the circuit breaker is not increased, and it is convenient for transportation and on-site installation.

[0044] In other embodiments of the circuit breaker, the vent hole may be provided only on the fixing base, and not on the joint. Of course, the vent hole may be provided only on the joint, and not on the fixing base.

[0045] In other embodiments of the circuit breaker: vent holes are no longer provided on the fixing seat and / or the joint. In this case, the insulating sleeve has an independent inflation joint, and the inner cavity of the insulating sleeve and the inner cavity of the crank box can be isolated by the fixing seat. Of course, in this case, in order to ensure the sealing, a sealing ring can also be installed on the outer peripheral surface of the joint, and the sealing ring is in sealing contact with the inner wall of the guide tube.

[0046] In other embodiments of the circuit breaker: if the original first sealing ring between the insulating sleeve and the elbow box is set on the end surface of the insulating sleeve, it is only necessary to set a sealing ring installation groove on the end surface of the fixing base facing the elbow box to install the second sealing ring and make the second sealing ring contact with the end surface of the elbow box.

[0047] In other embodiments of the circuit breaker: For a remanufactured circuit breaker, sealing ring installation grooves can be provided on both side end faces of the fixing seat, and a first sealing ring and a second sealing ring can be installed respectively to respectively achieve sealing between the insulating sleeve and the elbow box. In this case, there is no need to process the sealing ring installation grooves on the insulating sleeve and the elbow box.

[0048] In other embodiments of the circuit breaker: if an end face groove is provided on the crank arm box and an end face boss is provided on the insulating sleeve, a circular groove is provided on the end face of the fixed seat facing the insulating sleeve to cooperate with the end face boss, and a circular protrusion is provided on the end face of the fixed seat facing the crank arm box to cooperate with the end face groove.

[0049] In other embodiments of the circuit breaker: For a remanufactured circuit breaker, the ends of the insulating sleeve and the elbow box may no longer be provided with a stop structure. At this time, both side end surfaces of the fixing seat are flat, and the two side end surfaces are respectively fitted with the insulating sleeve and the elbow box, that is, the circular groove and the circular boss are no longer provided.

[0050] In other embodiments of the circuit breaker: when the guide tube is a metal tube, the end of the guide tube may no longer be provided with a bulging arc-shaped shielding surface, and the guide tube is a regular cylindrical tube with uniform wall thickness. Of course, in other embodiments, the guide tube may also be an insulating tube, in which case there is no need to provide an arc-shaped shielding surface.

[0051] In other embodiments of the circuit breaker: when the guide cylinder and the fixing seat are separately provided, the guide cylinder can also be welded and fixed on the fixing seat, and there is no need to set a mounting flange. Of course, in other embodiments, the guide cylinder and the fixing seat can also be integrally formed, such as casting or 3D printing.

[0052] In other embodiments of the circuit breaker, the gasket may also be a common flat gasket or an elastic gasket.

[0053] In other embodiments of the circuit breaker: the guide device may not include a gasket. In this case, when the insulating pull rod is connected to the stud, the end portion directly abuts against the joint.

[0054] In other embodiments of the circuit breaker: the screw rod and the joint can be integrally formed, that is, the stud structure is directly processed on the joint. In this case, the inserts of the joint and the end of the insulating rod can be both made of aluminum, or both made of steel, or the joint can be made of aluminum and the insert of the end of the insulating rod can be made of steel, or the joint can be made of steel and the insert of the end of the insulating rod can be made of aluminum.

[0055] In other embodiments of the circuit breaker: the joint may no longer be provided with a screw rod, and the joint and the insulating pull rod may be connected by welding or by hinged connection.

[0056] The embodiment of the guide device for a circuit breaker in the present invention is as follows: the specific structure of the guide device for a circuit breaker is the same as the guide device in any of the above embodiments of the circuit breaker, and will not be repeated here.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A guide device for a circuit breaker, characterized in that: It comprises a fixing seat for clamping and fixing between the insulating sleeve and the crank box of the circuit breaker, on which a guide cylinder is arranged, and the guiding device for the circuit breaker also comprises a joint for connecting between a connecting rod in the crank box and an insulating pull rod in the insulating sleeve, and a guide ring for guiding and slidingly cooperating with the inner wall of the guide cylinder is installed on the outer circumferential surface of the joint, and the axial length of the inner wall of the guide cylinder satisfies that the guide ring can always contact and guide with the inner wall of the guide cylinder when the joint moves during the opening and closing process of the circuit breaker, and the axial length of the joint is less than the axial length of the guide cylinder.

2. The circuit breaker guide device according to claim 1, characterized in that: The joint is provided with a screw rod for being threadably connected with the insert at the end of the insulating pull rod.

3. The circuit breaker guide device according to claim 2, characterized in that: The screw rod is a steel screw rod used for thread-matching connection with an aluminum insert at the end of the insulating pull rod, and the joint is an aluminum joint, on which the screw rod is installed through a thread structure.

4. The circuit breaker guide device according to claim 2, characterized in that: The guide device for the circuit breaker also includes a gasket which is sleeved on the outside of the screw rod and top-mounted between the insulating pull rod and the joint.

5. The circuit breaker guide device according to any one of claims 1 to 4, characterized in that: The guide cylinder and the fixed seat are separately arranged, and a mounting flange is arranged on the outer circumference of the guide cylinder. The guide cylinder passes through the fixed seat and the mounting flange is fitted with one end surface of the fixed seat. The guide cylinder is installed on the fixed seat by bolts that pass through the mounting flange and are connected to the fixed seat.

6. The circuit breaker guide device according to any one of claims 1 to 4, characterized in that: The guide cylinder is a metal cylinder, and a bulging arc-shaped shielding surface is arranged at the end of the guide cylinder away from the fixing seat.

7. The circuit breaker guide device according to any one of claims 1 to 4, characterized in that: A circular boss is provided on one end surface of the fixing seat, and a circular groove is provided on the other end surface. The circular boss is used to position and cooperate with the end surface groove of one of the insulating sleeve and the crank arm box, and the circular groove is used to position and cooperate with the end surface boss of the other one of the insulating sleeve and the crank arm box.

8. The circuit breaker guide device according to any one of claims 1 to 4, characterized in that: A sealing ring installation groove for installing a sealing ring to seal with the insulating sleeve and / or the crank box is arranged on at least one side end surface of the fixing seat.

9. The circuit breaker guide device according to any one of claims 1 to 4, characterized in that: The fixing seat and / or the joint are provided with ventilation holes so that the insulating gas can reach the inner cavity of the insulating sleeve when the insulating gas is filled through the elbow box.

10. A circuit breaker, comprising an insulating sleeve and a crank arm box, wherein an arc extinguishing chamber and an insulating pull rod are arranged in the insulating sleeve, a transmission shaft is arranged in the crank arm box, a crank arm is mounted on the transmission shaft, and the crank arm is connected to a connecting rod, and the circuit breaker further comprises a guide device, characterized in that: The guide device is a guide device for a circuit breaker according to any one of claims 1 to 9.

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